WO2019169597A1 - 紧急呼叫的方法和终端 - Google Patents

紧急呼叫的方法和终端 Download PDF

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Publication number
WO2019169597A1
WO2019169597A1 PCT/CN2018/078406 CN2018078406W WO2019169597A1 WO 2019169597 A1 WO2019169597 A1 WO 2019169597A1 CN 2018078406 W CN2018078406 W CN 2018078406W WO 2019169597 A1 WO2019169597 A1 WO 2019169597A1
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WO
WIPO (PCT)
Prior art keywords
emergency call
terminal
mobile communication
communication network
frequency band
Prior art date
Application number
PCT/CN2018/078406
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English (en)
French (fr)
Inventor
周志伟
姜印清
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2018/078406 priority Critical patent/WO2019169597A1/zh
Priority to CN202111628387.1A priority patent/CN114430545A/zh
Priority to CN201880064483.8A priority patent/CN111164995B/zh
Publication of WO2019169597A1 publication Critical patent/WO2019169597A1/zh

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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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information

Definitions

  • the present application relates to the field of terminals, and in particular, to a method and terminal for emergency call of a terminal.
  • VoWifi Voice Over Wifi
  • VoIP Voice Call Service
  • LTE Long Term Evolution
  • IMS IP Multimedia Subsystem
  • the present application provides a method and terminal for an emergency call, which is beneficial to improving the user experience.
  • a method for emergency call comprising: acquiring, by an terminal, an emergency call request; the terminal detecting a first frequency band of the mobile communication network; and if the energy of the first frequency band is greater than a preset emergency call threshold, the terminal Performing a cell search in the first frequency band, where the emergency call threshold is greater than a first threshold of the frequency band scanning of the mobile communication network; when the terminal successfully searches for the first cell in the first frequency band, the terminal initiates an emergency by using the first cell. call.
  • the search network is performed by using a preset emergency call threshold, where the preset emergency threshold is greater than the first threshold used by the mobile communication network to search the network, and the time for searching the network of the emergency call is shortened. To improve the user experience.
  • the method before the terminal detects the first frequency band of the mobile communication network, the method further includes: the terminal determining that the signal quality of the Wifi wireless network is greater than a predetermined threshold.
  • the domain selection manner in which the terminal initiates the emergency call may include, but is not limited to, the following manners:
  • Manner 1 The terminal may initiate an emergency call in the CS domain first. If the CS domain does not successfully initiate an emergency call, the terminal then initiates an emergency call on the IMS LTE.
  • an emergency call is initiated in an IP Multimedia Subsystem (IMS) Wireless-Fidelity (WIFI) domain, ie, an IMS WIFI domain.
  • IMS IP Multimedia Subsystem
  • WIFI Wireless-Fidelity
  • the terminal may initiate an emergency call in the IMS LTE domain. If the IMS LTE domain fails to initiate an emergency call, the terminal then initiates an emergency call in the CS domain.
  • an emergency call is initiated in the IMS WIFI domain.
  • the first threshold is for frequency band scanning of a mobile communication network during non-emergency calls.
  • the preset emergency call threshold may be used to include but is not limited to the following scenarios:
  • the threshold of the emergency call in the CS domain can be the preset emergency call threshold.
  • the threshold of the emergency call in the IMS LTE domain can be the scan threshold of the energy of the normal call.
  • the threshold of the emergency call in the IMS LTE domain can be the frequency of the mobile communication network. The first threshold for scanning.
  • the threshold of the emergency call in the IMS LTE domain can be a preset emergency call threshold.
  • the threshold of the emergency call in the CS domain can be the scan threshold of the energy of the normal call, that is, the threshold of the emergency call in the CS domain can be the frequency band scan of the mobile communication network.
  • the first threshold is the threshold of the emergency call in the IMS LTE domain.
  • the threshold of the emergency call in the CS domain and the threshold of the emergency call in the IMS LTE domain may all be preset emergency call thresholds.
  • the time for the emergency call to search the network in the mobile communication network is shortened, thereby reducing the waiting time of the user. To improve the user experience.
  • the method further includes: when the terminal does not successfully search for a cell in the first frequency band, or the terminal does not successfully initiate an emergency in the first frequency band At the time of the call, the terminal detects the second frequency band of the mobile communication network.
  • the method further includes: when the terminal does not successfully search for a cell in all frequency bands of the mobile communication network, or the terminal is all in the mobile communication network When an emergency call is not successfully initiated in the frequency band, the terminal initiates an emergency call through the Wifi wireless network.
  • the method further includes: if the terminal successfully initiates an emergency call through the Wifi wireless network, the terminal initiates the next emergency call through the Wifi wireless network.
  • the method before the terminal initiates the next emergency call through the Wifi wireless network, the method further includes: the terminal determining that the signal quality of the Wifi wireless network is greater than a predetermined threshold.
  • the terminal maintains a connection state with the Wifi wireless network from when the terminal successfully initiates the emergency call to when the terminal initiates the next emergency call.
  • an emergency call is initiated by preferentially adopting a Wifi wireless network with a signal quality that is successfully connected to the terminal and is always in a connected state, so that the search network when the terminal initiates an emergency call can be improved.
  • Efficiency improve the user experience.
  • the terminal does not reside in the mobile communication network before detecting the first frequency band of the mobile communication network.
  • the method before the terminal detects the first frequency band of the mobile communication network, the method includes: the terminal camps on a second cell of the mobile communication network, and the terminal is The second cell has not successfully initiated an emergency call.
  • the emergency call is initiated by the first cell, including:
  • the terminal initiates an emergency call by using the emergency call re-dial timer, wherein the duration of the emergency call redial timer is less than the duration of the mobile communication network call redial timer.
  • the emergency call re-dial-based timer the emergency call is initiated by the first cell, including: if the emergency call initiated by the first cell fails, Emergency call redial is performed before the emergency call redial timer expires.
  • the terminal when the terminal initiates an emergency call, by using the emergency call redial timer, the terminal can initiate redial again in a short time when the emergency call fails, thereby shortening the user during the emergency call. Waiting time to improve the user experience.
  • a method for emergency call including: when a non-emergency call is used, the terminal uses the first threshold to perform quality detection of the first frequency band; and in an emergency call, the terminal uses a preset emergency call threshold to perform the first Quality detection of a frequency band; when the terminal acquires an emergency call request, the terminal detects the first frequency band of the mobile communication network; if the energy of the first frequency band is greater than a preset emergency call threshold, the terminal performs the first frequency band The cell search, wherein the emergency call threshold is greater than a first threshold of the mobile communication network band scan; when the terminal successfully searches for the first cell in the first frequency band, the terminal initiates an emergency call through the first cell.
  • the search network is performed by using a preset emergency call threshold, where the preset emergency threshold is greater than the first threshold used by the mobile communication network to search the network, and the time for searching the network of the emergency call is shortened. To improve the user experience.
  • an emergency call for example, dials a number such as 911, 110, 119, 120, etc., an alarm or a help number; a non-emergency call, for example, dialing 10086 or a normal ordinary number call.
  • the method further includes: if the terminal successfully initiates an emergency call through the Wifi wireless network, the terminal initiates the next emergency call through the Wifi wireless network.
  • the method before the terminal initiates the next emergency call through the Wifi wireless network, the method further includes: the terminal determining that the signal quality of the Wifi wireless network is greater than a predetermined threshold.
  • the terminal maintains a connection state with the Wifi wireless network from when the terminal successfully initiates the emergency call to when the terminal initiates the next emergency call.
  • an emergency call is initiated by preferentially adopting a Wifi wireless network with a signal quality that is successfully connected to the terminal and is always in a connected state, so that the search network when the terminal initiates an emergency call can be improved.
  • Efficiency improve the user experience.
  • the terminal does not reside in the mobile communication network before detecting the first frequency band of the mobile communication network.
  • the method before the terminal detects the first frequency band of the mobile communication network, the method includes: the terminal camps on a second cell of the mobile communication network, and the terminal is The second cell has not successfully initiated an emergency call.
  • the emergency call is initiated by the first cell, including:
  • the terminal initiates an emergency call by using the emergency call re-dial timer, wherein the duration of the emergency call redial timer is less than the duration of the mobile communication network call redial timer.
  • the emergency call re-dial timer is used to initiate an emergency call by using the first cell, including: if an emergency call initiated by the first cell fails, Emergency call redial is performed before the emergency call redial timer expires.
  • the terminal when the terminal initiates an emergency call, by using the emergency call redial timer, the terminal can initiate redial again in a short time when the emergency call fails, thereby shortening the user during the emergency call. Waiting time to improve the user experience.
  • a method for emergency call comprising: performing, by a terminal, a cell search in a mobile communication network; and when the mobile station successfully searches for the first cell, the terminal is based on an emergency call redial timer, A cell initiates an emergency call, wherein the duration of the emergency call redial timer is less than the duration of the mobile communication network call redial timer.
  • the terminal when the terminal initiates an emergency call, by using the emergency call redial timer, the terminal can initiate redial again in a short time when the emergency call fails, thereby shortening the user's time during the emergency call. Waiting time to improve the user experience.
  • the emergency call is initiated by the first cell based on the emergency call redial timer, including: if the emergency call initiated by the first cell fails, Make an emergency call redial before the emergency call redial timer expires.
  • a method for emergency call comprising: if a terminal makes a non-emergency call, using a mobile communication network call redial timer to redial when the non-emergency call fails; if the terminal makes an emergency call, the emergency call In case of failure, the emergency call redial timer is used for redialing; when the terminal makes an emergency call, the terminal performs cell search in the mobile communication network; when the mobile terminal successfully searches for the first cell, the terminal re-dial based on emergency call The emergency call is initiated by the first cell, where the duration of the emergency call redial timer is less than the duration of the mobile communication network call redial timer.
  • the terminal when the terminal initiates an emergency call, by using the emergency call redial timer, the terminal can initiate redial again in a short time when the emergency call fails, thereby shortening the user's time during the emergency call. Waiting time to improve the user experience.
  • the emergency call is initiated by the first cell based on the emergency call redial timer, including: if the emergency call initiated by the first cell fails, Make an emergency call redial before the emergency call redial timer expires.
  • a fifth aspect provides a method for emergency call, comprising: determining, by the terminal, that the first emergency call is successfully initiated by the Wifi wireless network; when the first emergency call is successfully initiated by the terminal, and when the terminal initiates the second emergency call, The terminal and the Wifi wireless network are always connected, and the terminal initiates a second emergency call through the Wifi wireless network.
  • the efficiency of the search network when the terminal initiates an emergency call can be improved, and the user is improved.
  • the method further includes: the terminal determining that the signal quality of the Wifi wireless network is greater than a predetermined threshold.
  • a terminal comprising: a radio frequency circuit; one or more processors; a memory; a plurality of applications; and one or more computer programs, wherein the one or more computer programs are stored In the memory, the one or more computer programs include instructions that, when executed by the terminal, cause the terminal to perform the following steps:
  • Acquiring an emergency call request detecting a first frequency band of the mobile communication network; if the energy of the first frequency band is greater than a preset emergency call threshold, the terminal performs a cell search in the first frequency band, where the emergency The call threshold is greater than a first threshold of the mobile communication network frequency band scanning; when the first cell is successfully searched in the first frequency band, an emergency call is initiated by the first cell.
  • the command before the terminal detects the first frequency band of the mobile communication network, the command further includes: determining that a signal quality of the Wifi wireless network is greater than a predetermined threshold.
  • the first threshold is for a frequency band scan of the mobile communication network when a non-emergency call is made.
  • the instruction further includes: when the cell is not successfully searched in the first frequency band, or the emergency call is not successfully initiated in the first frequency band The second frequency band of the mobile communication network is detected.
  • the instructions further include: when the cell is not successfully searched in all frequency bands of the mobile communication network, or in all frequency bands of the mobile communication network When an emergency call is not successfully initiated, an emergency call is initiated through the Wifi wireless network.
  • the instructions further include: if the emergency call is successfully initiated by the Wifi wireless network, initiating the next emergency call through the Wifi wireless network.
  • the command before the terminal initiates the next emergency call by using the Wifi wireless network, the command further includes: determining that the signal quality of the Wifi wireless network is greater than a predetermined threshold .
  • the terminal and the Wifi wireless network are always Stay connected.
  • the terminal before the detecting the first frequency band of the mobile communication network, the terminal does not reside in the mobile communication network.
  • the terminal before the detecting the first frequency band of the mobile communication network, the terminal camps on a second cell of the mobile communication network, and the terminal is in the The second cell does not successfully initiate an emergency call.
  • the initiating an emergency call by using the first cell includes:
  • the emergency call is initiated by the first cell based on the emergency call redial timer, wherein the duration of the emergency call redial timer is less than the duration of the mobile communication network call redial timer.
  • the emergency call re-dial timer is used to initiate an emergency call by using the first cell, including:
  • the emergency call redial is performed before the emergency call redial timer expires.
  • a terminal comprising: a radio frequency circuit; one or more processors; a memory; a plurality of applications; and one or more computer programs, wherein the one or more computer programs are stored In the memory, the one or more computer programs include instructions that, when executed by the terminal, cause the terminal to perform the following steps:
  • the emergency call is initiated by the first cell based on the emergency call redial timer, wherein the duration of the emergency call redial timer is smaller than the mobile communication network.
  • the duration of the call redial timer is smaller than the mobile communication network.
  • the emergency call re-dial timer is used to initiate an emergency call by using the first cell, including:
  • the emergency call redial is performed before the emergency call redial timer expires.
  • a terminal comprising: a radio frequency circuit; one or more processors; a memory; a plurality of applications; and one or more computer programs, wherein the one or more computer programs are stored In the memory, the one or more computer programs include instructions that, when executed by the terminal, cause the terminal to perform the following steps:
  • the terminal When the terminal successfully initiates the first emergency call to when the terminal initiates a second emergency call, the terminal and the Wifi wireless network remain in a connected state, and the terminal initiates a second through the Wifi wireless network. Emergency call.
  • the instructions further comprising: determining that a signal quality of the Wifi wireless network is greater than a predetermined threshold.
  • a terminal includes: a processing unit, configured to acquire an emergency call request; the processing unit is further configured to detect a first frequency band of the mobile communication network; if the energy of the first frequency band is greater than The processing unit is further configured to perform a cell search in the first frequency band, where the emergency call threshold is greater than a first threshold of a mobile communication network frequency band scan; and a communication unit is configured to When the first cell is successfully searched in the first frequency band, an emergency call is initiated by the first cell.
  • the processing unit before the terminal detects the first frequency band of the mobile communication network, the processing unit is further configured to: determine that a signal quality of the Wifi wireless network is greater than a predetermined threshold.
  • the first threshold is for a frequency band scan of the mobile communication network when a non-emergency call is made.
  • the processing unit is further configured to: when the cell is not successfully searched in the first frequency band, or not successfully initiated in the first frequency band In the case of an emergency call, the second frequency band of the mobile communication network is detected.
  • the communication unit is further configured to: when the cell is not successfully searched in all frequency bands of the mobile communication network, or in the mobile communication network An emergency call is initiated through the Wifi wireless network when an emergency call is not successfully initiated in all frequency bands.
  • the communication unit is further configured to: initiate the next emergency by using the Wifi wireless network if the terminal successfully initiates an emergency call through the Wifi wireless network call.
  • the processing unit before the terminal initiates the next emergency call by using the Wifi wireless network, the processing unit is further configured to:
  • the terminal and the Wifi wireless network are always Stay connected.
  • the terminal does not reside in the mobile communication network before the terminal detects the first frequency band of the mobile communication network.
  • the terminal before the terminal detects the first frequency band of the mobile communication network, the terminal resides in a second cell of the mobile communication network, and the terminal is The second cell does not successfully initiate an emergency call.
  • the communication unit is further configured to: initiate an emergency call by using the emergency call re-dial timer, where the emergency call is redialed
  • the duration of the timer is less than the duration of the mobile communication network call redial timer.
  • the processing unit is further configured to: if the emergency call initiated by the first cell fails, perform an emergency call before the emergency call redial timer expires Redial.
  • a terminal includes: a processing unit, configured to perform cell search in a mobile communication network; and a communication unit, configured to: when the processing unit successfully searches for the first cell in the mobile communication network, based on An emergency call redial timer is used to initiate an emergency call by the first cell, wherein the duration of the emergency call redial timer is less than the duration of the mobile communication network call redial timer.
  • the processing unit is further configured to: if the emergency call initiated by the first cell fails, before the emergency call redial timer expires Emergency call redial.
  • a terminal in an eleventh aspect, includes: a processing unit, configured to determine that the terminal successfully initiates a first emergency call through a Wifi wireless network; and a communication unit, configured to successfully initiate the first When an emergency call is made to the terminal to initiate a second emergency call, the terminal and the Wifi wireless network remain in a connected state, and a second emergency call is initiated by the Wifi wireless network.
  • the signal quality of the Wifi wireless network is determined to be greater than a predetermined threshold.
  • a terminal including a memory, a processor, and a display, wherein the memory is used to store a computer program, the processor is configured to call and run a computer program from the memory, and when the program is executed, the processor executes the above The method of any of the first aspect or any of the possible implementations of the first aspect.
  • a thirteenth aspect a computer readable medium for storing a computer program, the computer program comprising the method of any one of the first aspect to the fifth aspect, or any one of the possible implementations instruction.
  • a fourteenth aspect a computer program product comprising instructions, when executed on a computer, causing a computer to perform the method of any one of the first to fifth aspects above or any possible implementation thereof .
  • FIG. 1 is a schematic diagram of a system applied in accordance with an embodiment of the present application.
  • FIG. 2 is a schematic flow chart of a method of an emergency call according to an embodiment of the present application.
  • FIG. 3 is a schematic flowchart of a method for an emergency call according to another embodiment of the present application.
  • FIG. 4 is a schematic flow chart of a method of an emergency call according to another embodiment of the present application.
  • FIG. 5 is a schematic flowchart of a method for an emergency call according to another embodiment of the present application.
  • FIG. 6 is a schematic block diagram of a terminal according to an embodiment of the present application.
  • FIG. 7 is a schematic block diagram of a terminal according to another embodiment of the present application.
  • FIG. 1 is a schematic diagram of a system to which the embodiment of the present application is applied.
  • system 100 can include network device 102 and terminals 104 and 106, wherein the network device is connected to the terminal via a wireless connection.
  • FIG. 1 is only an example in which the system includes a network device, but the embodiment of the present application is not limited thereto.
  • the system may further include more network devices; similarly, the system may also include more terminals. .
  • the system may also be referred to as a network, which is not limited by the embodiment of the present application.
  • a terminal may be a terminal device, or may be a user equipment (User Equipment, UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a wireless communication device, User agent or user device.
  • the access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), with wireless communication.
  • PLMN public Land Mobile Network
  • the terminal may also be a wearable device.
  • a wearable device which can also be called a wearable smart device, is a general term for applying wearable technology to intelligently design and wear wearable devices such as glasses, gloves, watches, clothing, and shoes.
  • a wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are more than just a hardware device, but they also implement powerful functions through software support, data interaction, and cloud interaction.
  • Generalized wearable smart devices include full-featured, large-size, non-reliable smartphones for full or partial functions, such as smart watches or smart glasses, and focus on only one type of application, and need to work with other devices such as smartphones. Use, such as various smart bracelets for smart signs monitoring, smart jewelry, etc.
  • the network device may be a device for communicating with the terminal, and the network device may be a Global System of Mobile communication (GSM) or a base station in a Code Division Multiple Access (CDMA) (Base Transceiver Station, BTS), which may also be a base station (NodeB, NB) in a Wideband Code Division Multiple Access (WCDMA) system, or an evolved base station in a Long Term Evolution (LTE) system (Evolutional The Node B, the eNB or the eNodeB, may also be a wireless controller in a Cloud Radio Access Network (CRAN) scenario, or the network device may be a relay station, an access point, an in-vehicle device, a wearable device, and Network devices in future 5G networks or network devices in future evolved PLMN networks.
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • BTS Base Transceiver Station
  • NodeB, NB Wideband Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • LTE
  • the network device provides a service for the cell, and the terminal communicates with the network device by using a transmission resource (for example, a frequency domain resource, or a spectrum resource) used by the cell
  • a transmission resource for example, a frequency domain resource, or a spectrum resource
  • the cell may be a network device (
  • a cell corresponding to a base station the cell may belong to a macro base station, or may belong to a base station corresponding to a small cell, where the small cell may include: a metro cell, a micro cell, and a pico cell. Pico cell, femto cell, etc.
  • These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.
  • the cell may also be a hyper cell.
  • the terminal selects a domain to perform network search and registration according to the domain selection priority.
  • the priority of setting the mobile communication network priority in the terminal is greater than the IMS WIFI domain priority.
  • the mobile communication network includes a circuit switched CS domain and/or an IMS LTE domain.
  • the terminal When the terminal receives the normal call request of the user, it first determines whether the terminal has camped on the mobile communication network at this time. If the terminal has camped on the mobile communication network, the terminal directly initiates an ordinary call through the mobile communication network.
  • the terminal If the terminal does not reside in the mobile communication network, the terminal begins the search network and registration phase of the mobile communication network.
  • the terminal in order to obtain the services of the network, the terminal needs to first search for the network and initiate registration, and the process of the terminal searching for the network is called cell search.
  • the frequency band is first acquired.
  • the coarse sweep frequency point is extracted according to a preset step in the acquired frequency band, and the Received Signal Strength Indication (RSSI) value of the coarse sweep frequency point is compared with the first threshold.
  • RSSI value of the extracted coarse sweep point is greater than the first threshold, the frequency band in which the frequency point is located is finely scanned, and the frequency band here can be understood as a stepped frequency band in which the frequency point is located.
  • the first threshold may be a preset RSSI threshold.
  • the fine sweep based on the physical cell search is performed by the frequency of the coarse scan, and the three-step search is mainly used.
  • the so-called three-step method means that the first step is to find the slot header of the WCDMA signal through the Primary Synchronization Code Channel (PSCH), and the second step is to find the frame of the WCDMA signal through the Secondary Synchronization Channel (SSCH).
  • the header and scrambling code group number, the third step is to find the scrambling code number of the WCDMA signal through a Common Pilot Channel (CPICH).
  • CPICH Common Pilot Channel
  • the first threshold may be a preset RSSI threshold.
  • the RSSI is the average of the power of all signals (including pilot signals, data signals, neighboring interference signals, noise signals, etc.) received in the channel.
  • the first threshold may be a preset Reference Signal Receiving Power (RSRP) threshold, and the RSRP is: a power contribution (in W) of resource particles carrying a cell-specific reference signal in the measurement frequency band. Linear average.
  • RSRP Reference Signal Receiving Power
  • the priority order of the terminal domain selection may be set.
  • the user can set the priority order of the normal call time domain on the terminal according to the current network signal quality condition.
  • the priority of the terminal domain selection is in the order specified by the protocol, that is, the priority of the mobile communication network is greater than that of the WIFI network. That is, when an emergency call is initiated, the priority of the domain selection is the order specified by the protocol, and the user cannot set the priority order of the terminal domain selection according to the network signal quality.
  • the terminal when the terminal receives an emergency call request and initiates an emergency call, the terminal needs to first perform network search and registration on the mobile communication network. If the emergency call is not successfully initiated on the mobile communication network, the terminal will initiate an emergency call based on the Wifi wireless network.
  • the terminal still uses the first threshold to perform frequency band scanning in the mobile communication network.
  • the terminal When the signal quality of the mobile communication network is poor but the access parameter of the Wifi wireless network is higher than the handover threshold, for example, when the signal quality of the Wifi wireless network is good, the terminal must first search for the emergency communication network on the mobile communication network with poor signal quality. And registration.
  • an emergency call When an emergency call is not successfully initiated in the mobile communication network, an emergency call can be initiated under the Wifi wireless network with better signal quality. At this time, it takes a lot of time for the terminal to perform network search and registration in the mobile communication network.
  • the access parameter of the Wifi wireless network is higher than the handover threshold (the wireless network access threshold), and the handover threshold may be the following parameters, for example, a received signal strength indicator (RSSI) threshold, Or, the block error rate (BLER) threshold, the block error rate is the percentage of blocks that are erroneous in all transmitted blocks, or the threshold of channel utilization.
  • RSSI received signal strength indicator
  • BLER block error rate
  • the first threshold of the frequency band scanning of the current ordinary call is used for the network search and registration phase of the emergency call, which affects the speed and quality of the voice service during the emergency call.
  • the terminal scans the frequency band energy by using a preset emergency call threshold, where the preset emergency call threshold is higher than the first threshold.
  • FIG. 2 is a schematic flow chart of a method of an emergency call according to an embodiment of the present application.
  • the method shown in FIG. 2 is performed by a terminal, and can be executed, for example, by the terminal shown in FIG. 1.
  • the energy of the first frequency band may be the energy at a predetermined frequency point on the first frequency band, for example, the preset frequency point may be a coarse frequency sweep point, and the setting is set in a given frequency band.
  • the stepping step extracts the coarse sweep frequency point. For example, if the step value is 10, the first point of the frequency point 1 to the frequency point 10 is when the energy at the coarse sweep frequency point 10 is greater than the preset emergency call threshold. Fine sweep of all frequency points included in the frequency band. At this time, the energy of the first frequency band can be considered to be greater than a preset emergency call threshold. This application does not limit this.
  • the terminal when the terminal receives the emergency call dialing of the user, the terminal first detects the mobile communication network according to the predetermined domain selection priority.
  • the terminal does not camp on the mobile communication network when the terminal acquires the emergency call request, it starts detecting the mobile communication network.
  • the terminal can initiate an emergency call directly on the resident mobile communication network.
  • the terminal does not successfully initiate an emergency call, the mobile communication network is re-detected.
  • the domain selection manner in which the terminal initiates the emergency call may include, but is not limited to, the following manners:
  • Manner 1 The terminal may initiate an emergency call in the CS domain first. If the CS domain does not successfully initiate an emergency call, the terminal then initiates an emergency call on the IMS LTE.
  • the terminal may initiate an emergency call in the IMS LTE domain. If the IMS LTE domain fails to initiate an emergency call, the terminal then initiates an emergency call in the CS domain.
  • an emergency call is initiated in the IMS WIFI domain.
  • the terminal when the terminal does not reside in the CS domain, the terminal starts the search network and the registration phase of the CS domain, for example, the terminal may acquire the first frequency band in the CS domain, and the first The energy of the band is detected.
  • the first frequency band here can be any frequency band in the CS domain.
  • the terminal when the terminal does not camp on the IMS LTE network, the terminal starts the stage of searching the network of the IMS LTE domain, for example, the terminal may acquire the first frequency band in the IMS LTE domain, and The energy of a band is detected.
  • the first frequency band here may be any frequency band in the IMS LTE domain.
  • S202 The terminal determines whether the energy of the current first frequency band is greater than a preset emergency call threshold, where the emergency call threshold is greater than a first threshold of the mobile communication network frequency band scanning. If the energy of the first frequency band is greater than a preset emergency call threshold, then S203 is performed.
  • the first threshold is used for frequency band scanning of the mobile communication network during non-emergency calls.
  • the first threshold may be an RSSI threshold for a normal call, which is not limited in this application.
  • the terminal performs cell search in a first frequency band.
  • an emergency call is initiated, and the preset emergency call threshold based on the frequency band energy scan is greater than the normal call.
  • the scanning threshold of the time-band energy thereby initially screening out the high-quality frequency points in the first frequency band of the CS domain, and performing physical community search at the selected frequency points.
  • the number of frequency points for performing cell search in the first frequency band is reduced, thereby reducing the search network time of the terminal in the CS domain during the emergency call, and improving the search in the CS domain when the terminal is in an emergency call.
  • the efficiency of the network is reduced.
  • an emergency call is initiated, and the preset emergency call threshold based on the frequency band energy scan is greater than normal.
  • the scanning threshold of the band energy at the time of the call thereby initially screening out the high-quality frequency points in the first frequency band of the IMS LTE domain, and performing physical cell search at the selected frequency points.
  • the number of frequency points for cell search in the first frequency band is reduced, thereby reducing the search network time of the terminal in the IMS LTE domain during the emergency call, and improving the emergency call of the terminal in the IMS LTE domain.
  • the efficiency of the search network is reduced.
  • the preset emergency call threshold is greater than the first threshold of the energy scanning of the frequency band of the mobile communication network, where the preset emergency call threshold may be used to include but is not limited to the following scenarios:
  • the threshold of the emergency call in the CS domain can be the preset emergency call threshold.
  • the threshold of the emergency call in the IMS LTE domain can be the scan threshold of the energy in the normal call.
  • the threshold of the emergency call in the IMS LTE domain can be the frequency scan. A threshold.
  • the threshold of the emergency call in the IMS LTE domain can be the preset emergency call threshold.
  • the threshold of the emergency call in the CS domain can be the scan threshold of the energy of the normal call.
  • the threshold of the emergency call in the CS domain can be the first of the frequency sweep. Threshold.
  • the threshold of the emergency call in the CS domain and the threshold of the emergency call in the IMS LTE domain may all be preset emergency call thresholds.
  • the preset emergency call threshold wherein the preset emergency call threshold is greater than the first threshold of the mobile communication network frequency band scanning, shortens the time for searching the network of the emergency call, and reduces the emergency call initiated by the user.
  • the waiting time increases the user's experience.
  • the terminal determines whether the first cell is successfully searched in the current first frequency band. If the terminal successfully searches for the first cell in the first frequency band, perform S205.
  • the terminal first performs frequency point screening in the first frequency band.
  • a frequency point in the first frequency band is greater than a threshold of the emergency call search network, the terminal performs a physical cell-based search at the frequency point.
  • the first cell may be any one of the CS domain or the IMS LTE domain, and is not specifically limited herein.
  • the terminal may determine that the signal quality of the Wifi wireless network is greater than a predetermined threshold, for example, the access parameter of the Wifi wireless network is greater than the access threshold.
  • the terminal when the terminal does not successfully initiate an emergency call at all frequency points in the first frequency band that are greater than a preset emergency call threshold, the terminal continues to detect in the mobile communication network. Second frequency band.
  • the terminal If the energy of the second frequency band is greater than a preset emergency call threshold, the terminal performs a cell search in the second frequency band, where the emergency call threshold is greater than a first threshold of a mobile communication network frequency band scan;
  • the terminal When the terminal successfully searches for the second cell in the second frequency band, the terminal initiates an emergency call by using the second cell.
  • the terminal If the emergency call is not successfully performed at all the frequency points of the second frequency band that are greater than the preset emergency call threshold, the terminal performs a similar method, and the terminal detects the third frequency band in the mobile communication network, which is not specifically limited herein.
  • the terminal when the terminal can preferentially initiate an emergency call in the CS domain. If the terminal does not successfully initiate an emergency call in the CS domain, the terminal initiates an emergency call in the IMS LTE domain according to the domain selection priority of the emergency call.
  • the terminal when the terminal can preferentially initiate an emergency call in the IMS LTE domain. If the terminal does not successfully initiate an emergency call in the IMS LTE domain, the terminal initiates an emergency call in the CS domain according to the domain selection priority of the emergency call.
  • the terminal when the terminal does not successfully search for a cell in all frequency bands of the mobile communication network, or the terminal does not successfully initiate an emergency call in all frequency bands of the mobile communication network, the terminal passes through the terminal.
  • the Wifi wireless network initiates an emergency call.
  • the terminal does not successfully search for a cell in all frequency bands of the mobile communication network, but does not limit the following scenarios:
  • Scenario 1 The terminal does not successfully search for the cell in all the frequency bands of the CS domain, that is, the terminal is located at a frequency point greater than the preset emergency call threshold included in each frequency band such as the first frequency band and the second frequency band of the CS domain.
  • the cell is not successfully searched, and then the cell is not successfully searched at the frequency point of the first frequency band and the second frequency band of the IMS LTE domain that is greater than the preset emergency call threshold, so that the mobile communication network is not successfully Successfully initiated an emergency call.
  • Scenario 2 The terminal does not successfully search for a cell in all the frequency bands of the IMS LTE domain, that is, the frequency of the terminal in the first frequency band and the second frequency band of the IMS LTE domain that is greater than the preset emergency call threshold.
  • the cell is not successfully searched for, and then the cell is not successfully searched at the frequency point of the first frequency band and the second frequency band of the CS domain that is greater than the preset emergency call threshold, so that the cell is not successfully searched in the mobile communication network.
  • An emergency call was not successfully initiated.
  • the terminal does not successfully initiate an emergency call in all frequency bands of the mobile communication network, including but not limited to the following scenarios:
  • Scenario 1 The terminal may successfully search for a cell in a certain frequency band of the CS domain that is greater than a preset emergency call threshold frequency point, but the emergency call is not successfully initiated at the frequency point.
  • the terminal can continue to detect other frequency bands in the CS domain until the terminal fails to initiate an emergency call on all frequency bands that can be searched in the CS domain.
  • the terminal then successfully searches for the cell in a certain frequency band of the IMS LTE domain that is greater than the preset emergency call threshold frequency point, but the emergency call is not successfully initiated at the frequency point.
  • the terminal can continue to detect other frequency bands in the IMS LTE domain until the terminal fails to initiate an emergency call on all frequency bands that can be searched in the IMS LTE domain.
  • the terminal does not successfully initiate an emergency call in all frequency bands of the mobile communication network.
  • Scenario 2 The terminal successfully searches for a cell in a certain frequency band of the IMS LTE domain that is greater than a preset emergency call threshold frequency point, but the emergency call initiated at the frequency point is unsuccessful. The terminal can continue to detect other frequency bands in the IMS LTE domain until the terminal fails to initiate an emergency call on all frequency bands that can be searched in the IMS LTE domain.
  • the terminal may then successfully search for the cell in a certain frequency band of the CS domain that is greater than the preset emergency call threshold frequency point, but the emergency call is not successfully initiated at the frequency point.
  • the terminal can continue to detect other frequency bands in the CS domain until the terminal fails to initiate an emergency call on all frequency bands that can be searched in the CS domain.
  • the terminal does not successfully initiate an emergency call in all frequency bands of the mobile communication network.
  • the terminal if the terminal successfully initiates an emergency call through the Wifi wireless network, the terminal initiates the next emergency call by preferentially passing the Wifi wireless network.
  • the terminal determines that the signal quality of the Wifi wireless network is greater than a predetermined threshold. That is, the Wifi wireless network signal quality currently used for the call service is in a good condition.
  • the terminal successfully initiates the emergency call to when the terminal initiates the next emergency call, the terminal and the Wifi wireless network remain in a connected state.
  • the terminal needs to re-acquire the first frequency band of the mobile communication network and perform a search network.
  • the priority of the Wifi wireless network with good signal quality in the last emergency call and in the connected state is shortened, the time for searching the network of the emergency call is shortened, and the waiting time when the user initiates the emergency call is reduced. , to improve the user experience.
  • the emergency call is initiated by the first cell.
  • the emergency call is continued by the first cell based on the emergency call redial timer, and the duration of the emergency call redial timer is less than the duration of the mobile communication network call redial timer.
  • the emergency call redial timer performs redialing of the emergency call number before timeout, and initiates an emergency call again.
  • a redial timer is configured in the terminal, and a redial timer is set in the redial timer.
  • the terminal selects a priority according to the domain, for example, the terminal starts network search and registration in the IMS LTE domain.
  • the emergency call redial timer is set, wherein the duration of the emergency call redial timer is less than the duration of the mobile communication network call redial timer, that is, the duration of the redial timer during the emergency call is less than normal.
  • the duration of the call redial timer which reduces the redial time of the emergency call.
  • FIG. 3 is a schematic flowchart of a method for an emergency call according to another embodiment of the present application.
  • the method shown in FIG. 3 is performed by a terminal, and can be executed, for example, by the terminal shown in FIG. 1.
  • the CS domain priority is higher than the IMS LTE domain as an example.
  • the process performed in FIG. 3 may also be that the IMS LTE domain priority is higher than the CS domain, which is not specifically limited herein.
  • the terminal acquires an emergency call request.
  • the terminal obtains the emergency call requesting terminal, and the user may select the number to initiate the emergency call on the terminal call interface, or the user may dial the emergency number through the voice control operation terminal, which is not specifically limited.
  • the CS domain priority is higher than the IMS LTE domain, so the emergency call is initiated in the CS domain.
  • the terminal determines whether the terminal has camped in the CS domain at this time.
  • S305 is performed. That is, if the terminal satisfies the access condition of a certain cell in the CS domain and successfully registers in a certain cell, S305 is performed. If the terminal does not reside in the CS domain, then S304 is performed.
  • the terminal performs network search and registration in the CS domain.
  • the S304 includes the following steps:
  • the terminal acquires the first frequency band in the CS domain, and performs coarse scan detection on the energy of the first frequency band.
  • S3042 Detecting, according to the preset emergency call threshold, a frequency point that is greater than a preset emergency call threshold in the first frequency band, where the preset emergency call threshold is higher than a threshold of the normal call, that is, higher than a frequency communication network.
  • the first threshold is executed in S3403.
  • the first threshold may be an RSSI threshold at the time of ordinary call. This application does not limit this.
  • S3043 Perform frequency-based fine-sweeping based on physical cell search at a frequency point greater than a preset emergency call threshold.
  • S3044 Determine whether cell search and registration performed at a frequency point greater than a preset emergency call threshold is successful. If the terminal successfully searches for and registers the cell at the frequency, S305 is performed. If the cell search and registration at the frequency point is not successful, then S3041 is performed.
  • the terminal initiates an emergency call in the CS domain.
  • the terminal has camped on the CS domain before the terminal initiates an emergency call in the CS domain.
  • the terminal before the terminal initiates an emergency call in the CS domain, the terminal successfully searches for and registers the cell in the first frequency band that is greater than the frequency of the preset emergency call.
  • the terminal determines whether the CS domain emergency call is successful.
  • S307 is performed. If the terminal does not successfully initiate an emergency call in the CS domain, the process returns to continue to execute S304.
  • the terminal does not successfully make an emergency call in the CS domain, the terminal continues to detect the second frequency band in the CS domain to perform the above-mentioned S3044, S3044, S3044, and S3044. If the terminal still fails to initiate an emergency call in the second frequency band, the terminal performs the foregoing similar process, and the terminal detects the third frequency band in the CS domain, which is not specifically limited in the embodiment of the present application.
  • the emergency call is successfully initiated through the CS domain, that is, the emergency call process ends.
  • the terminal determines whether the CS domain emergency call is successful.
  • the emergency call of the terminal in the CS domain is not successfully included but is not limited to the following two modes:
  • Manner 1 The terminal is not successfully searched or successfully registered to the cell in all frequency bands of the CS domain, for example, the first frequency band, the second frequency band, and the like.
  • Manner 2 The terminal does not successfully initiate an emergency call in all frequency bands of the CS domain, for example, the first frequency band, the second frequency band, and the like.
  • the emergency call process further includes the following steps:
  • the terminal when the terminal does not successfully initiate an emergency call in the CS domain, the terminal then initiates an emergency call on the IMS LTE domain.
  • the process of the emergency call initiated by the terminal in the IMS LTE domain is similar to the process of initiating the emergency call in the CS domain, that is, the S303 terminal is determined to determine whether it has camped on the IMS LTE domain.
  • S305 is performed to initiate an emergency call on the IMS LTE domain. If not camped on the IMS LTE domain, perform S304 to perform IMS LTE domain search network and registration.
  • the S304 includes the following steps:
  • the terminal acquires the first frequency band in the IMS LTE domain, and performs coarse scan detection on the energy of the first frequency band.
  • S3042 Detect a frequency point that is greater than a preset emergency call threshold in the first frequency band according to the preset emergency call threshold, and execute S3043.
  • S3043 Perform frequency sweeping based on physical cell search for a frequency point greater than a preset emergency call threshold.
  • S3044 Determine whether cell search and registration are successful at a frequency point greater than a preset emergency call threshold. If the cell search and registration are successful, S305 is performed. If the cell search and registration are not successful, then S3041 is performed.
  • the terminal initiates an emergency call in the IMS LTE domain.
  • the terminal has camped on the IMS LTE domain before the terminal initiates the emergency call in the IMS LTE domain, or the cell search and registration succeeds at the frequency point where the first frequency band is greater than the preset emergency call.
  • the terminal determines whether the emergency call of the IMS LTE domain is successful. If the terminal successfully makes an emergency call, S307 is performed. If the terminal does not successfully make an emergency call in the IMS LTE domain, then return to proceed to S304.
  • the terminal does not successfully make an emergency call in the IMS LTE domain, the terminal continues to detect the second frequency band in the IMS LTE domain to perform the foregoing S3044, S3044, S3044, and S3044. If the terminal still fails to initiate an emergency call in the second frequency band, the terminal performs the foregoing similar process, and the terminal detects the third frequency band in the IMS LTE domain, which is not specifically limited in the embodiment of the present application.
  • the terminal determines whether the IMS LTE domain emergency call is successful. If the IMS LTE domain emergency call is unsuccessful, S309 is performed.
  • the emergency call of the terminal in the IMS LTE domain is not successfully included but is not limited to the following two modes:
  • Manner 1 The terminal is not successfully searched or successfully registered to the cell in all frequency bands of the IMS LTE domain, for example, the first frequency band, the second frequency band, and the like.
  • Manner 2 The terminal does not successfully initiate an emergency call in all frequency bands of the IMS LTE domain, for example, the first frequency band, the second frequency band, and the like.
  • the Wifi wireless network used for the voice call service has a certain difference from the ordinary Wifi wireless network.
  • the Wifi wireless network used for the voice call service needs to send the Wifi wireless network to the core after the normal Wifi wireless network is authenticated, authenticated, and encrypted by a proprietary server.
  • the terminal determines whether the emergency call voice service is initiated based on the Wifi wireless network. If the terminal successfully initiates an emergency call voice service based on the Wifi wireless network, S311 is performed. If the terminal does not successfully initiate the emergency call voice service based on the Wifi wireless network, then S312 is performed.
  • the CS domain is based on a first threshold search network (where the first threshold is a threshold for a normal call, for example, the first threshold may be an RSSI threshold for a normal call), where S312 includes The following steps:
  • S3121 The terminal acquires the first frequency band in the CS domain, and performs coarse sweep detection on the energy of the first frequency band.
  • S3122 According to the first threshold, detecting a frequency point in the first frequency band that is greater than a preset emergency call threshold, and executing S3123.
  • S3123 Perform frequency sweeping based on physical cell search for a frequency point greater than the first threshold.
  • S3124 Determine whether cell search and registration are successful at a frequency point greater than the first threshold. If the cell search and registration are successful, S305 is performed. If the cell search and registration are not successful, S3121 is executed.
  • the threshold in S3042 is a preset emergency call threshold, which can be understood as a specific threshold of an emergency call, and the threshold is higher than the first threshold in S3123.
  • the first threshold can be understood as a threshold for a normal call.
  • the first threshold can be the RSSI threshold for a normal call.
  • the preset emergency call threshold is higher than the first threshold of the ordinary call, that is, the frequency of the high-quality signal can be initially screened, and the number of frequency bands of the search network is reduced, thereby shortening the time of searching the network for the emergency call.
  • S302 may be that the IMS LTE domain has a higher priority than the CS domain. That is, the above process is first executed in the IMS LTE domain.
  • the CS domain search network and the registration may adopt a preset emergency call threshold
  • the IMS LTE domain search network and the registration may also adopt a preset emergency call threshold
  • the CS domain search network and the registration may adopt a preset emergency call threshold, and the IMS LTE domain search network and the registration may adopt the first threshold of the ordinary call.
  • the CS domain search network and the registration may adopt the first threshold of the ordinary call, and the IMS LTE domain search network and the registration may adopt a preset emergency call threshold.
  • the Wifi wireless network signal quality is greater than a predetermined threshold, that is, the Wifi wireless network signal quality is good.
  • the Wifi wireless network can be used for a voice call service, and the Wifi wireless network needs to be sent to the core after the normal Wifi wireless network is authenticated, authenticated, and encrypted by a proprietary server.
  • the network search and registration are performed by using the preset emergency call threshold, and the frequency of the high-quality signal can be initially screened to reduce the number of frequency bands of the mobile communication network search network. If the mobile communication network fails to initiate an emergency call, Quickly initiate emergency call voice call service through Wifi wireless network. Thereby reducing the waiting time when the user makes an emergency call and providing the user's experience.
  • FIG. 4 is a schematic flow chart of a method of an emergency call according to another embodiment of the present application.
  • the method shown in FIG. 4 is executed by the terminal, for example, by the terminal shown in FIG. 1.
  • S402 in FIG. 4 is used to initiate an emergency call in the CS domain, and may also be used to initiate an emergency call in the IMS LTE domain, and may also be S305 in FIG.
  • S401 The terminal determines whether the cell search and registration are successful. If the terminal has already successfully searched for cells and registered at this time, S402 is performed.
  • S402 The terminal initiates an emergency call in the CS domain.
  • S402 comprises the following steps:
  • S4021 The terminal determines whether the first call fails. If the first call fails, S4022 is executed.
  • the failure of the first call of the terminal does not mean that the terminal does not successfully initiate an emergency call.
  • the successful call initiated on the terminal interface can initiate an emergency call for the redial timer based on the internal configuration of the terminal. Emergency call.
  • the terminal searches for and successfully registers a cell, for example, when the terminal successfully searches for the first cell, initiates an emergency call by using the emergency call re-dial timer, where the emergency call redial timer is The duration is less than the duration of the mobile communication network call redial timer.
  • the length of the mobile communication network call redial timer is 10 seconds, that is, if the terminal fails to initiate a call within 10 seconds, the redial timer automatically redials the number to initiate the call again. If it exceeds 10 seconds, the redial timer will stop calling again in the mobile communication network.
  • the duration of the emergency call redial timer can be set to 5 seconds. If the emergency call fails within 5 seconds, the emergency call redial timer will automatically redial the number to initiate the call again. If it exceeds 5 seconds, the emergency call redial timer will stop the emergency call from being initiated again in the mobile communication network. Therefore, the waiting time of the emergency call is reduced, and the user's experience is improved.
  • the redial timer may be preset in the terminal in advance, for example, the redial duration is set to 30 seconds.
  • the number of redial attempts is determined by factors such as the network environment in which the terminal is located and the received signaling.
  • the time interval for the terminal to initiate a call may be shortened, that is, the number of redials initiated by the terminal increases.
  • S4023 The terminal performs emergency call redialing.
  • emergency call redialing may be performed before the emergency call redial timer expires.
  • the emergency call redial timer automatically redials the number and initiates an emergency call again before the emergency call redial timer exceeds the set redial duration.
  • FIG. 5 is a schematic flowchart of a method for an emergency call according to another embodiment of the present application.
  • the method shown in FIG. 5 is performed by a terminal, and can be executed, for example, by the terminal shown in FIG. 1.
  • the user UE dials an emergency number on the terminal.
  • the terminal dialing the emergency number may be a number for the user to initiate an emergency call on the terminal call interface, or the user may dial the emergency number through the voice control operation terminal, which is not specifically limited.
  • S502 The terminal determines whether the currently connected Wifi wireless network is the same registered Wifi wireless network as the last successful Wifi wireless network that initiated the emergency call voice service.
  • the terminal determines whether the same registered Wifi wireless network is available for emergency call voice service.
  • S505 is performed. If the Wifi wireless network is not available for emergency call voice service, then S504 is performed.
  • the original emergency call procedure may be an emergency call procedure using a preset emergency call threshold as described in FIG. 3, or may be an emergency call procedure similar to FIG. 3 but adopting a normal call threshold, which is not specifically described herein. limited.
  • S505 The terminal directly initiates a second emergency call voice service from the Wifi wireless network that is the same registered and last successfully initiated the emergency call voice service.
  • the terminal determines whether the emergency call voice service is successful.
  • the terminal successfully initiates an emergency call voice service based on the Wifi wireless network, that is, the emergency call process ends.
  • the terminal determines that the signal quality of the Wifi wireless network is greater than a predetermined threshold, that is, the signal quality of the Wifi wireless network is good.
  • the terminal determines that the first emergency call is successfully initiated by the Wifi wireless network.
  • the terminal and the Wifi wireless network remain connected, and the terminal can pass the The Wifi wireless network initiates a second emergency call.
  • the Wifi wireless network can be used for a voice call service, and the Wifi wireless network needs to be sent to the core after the normal Wifi wireless network is authenticated, authenticated, and encrypted by a proprietary server.
  • the Wifi wireless network that has been in the connection state with the terminal and successfully launched the emergency call voice service last time initiates the emergency call for the same registered Wifi wireless network, thereby reducing the search network of the emergency call.
  • the size of the sequence numbers of the foregoing processes does not mean the order of execution sequence, and the order of execution of each process should be determined by its function and internal logic, and should not be applied to the embodiment of the present application.
  • the implementation process constitutes any limitation.
  • a terminal according to an embodiment of the present application will be described below. It should be understood that the terminal in the embodiment of the present application may perform various methods in the foregoing embodiments of the present application, that is, the specific working processes of the following various products, and may refer to the corresponding process in the foregoing method embodiments.
  • FIG. 6 is a schematic block diagram of a terminal according to an embodiment of the present application. As shown in FIG. 6, the terminal 600 includes a processing unit 610 and a communication unit 620.
  • the processing unit 610 and the communication unit 620 communicate with each other through an internal connection path to transfer control and/or data signals.
  • the processing unit 610 and the communication unit 620 may be implemented by a chip to implement the corresponding functions of the terminal in the embodiment of the present application.
  • the processing unit 610 is configured to:
  • the processing unit 610 is further configured to:
  • the processing unit 610 is further configured to perform a cell search in the first frequency band, where the emergency call threshold is greater than a frequency communication network frequency band scan.
  • the first threshold is greater than a preset emergency call threshold.
  • the communication unit 620 is used to:
  • the processing unit 610 is further configured to:
  • the first threshold is used for frequency band scanning of the mobile communication network when a non-emergency call is made.
  • processing unit 610 is further configured to:
  • the second frequency band of the mobile communication network is detected.
  • the communication unit 620 is further configured to:
  • an emergency call is initiated through the Wifi wireless network.
  • the communication unit 620 is further configured to:
  • the terminal successfully initiates an emergency call through the Wifi wireless network, the next emergency call is initiated by the Wifi wireless network.
  • the processing unit 610 is further configured to:
  • the terminal when the terminal successfully initiates the emergency call to when the terminal initiates the next emergency call, the terminal and the Wifi wireless network remain in a connected state.
  • the terminal before the terminal detects the first frequency band of the mobile communication network, the terminal does not reside in the mobile communication network.
  • the terminal before the terminal detects the first frequency band of the mobile communication network, the terminal resides in a second cell of the mobile communication network, and the terminal does not successfully initiate an emergency call in the second cell.
  • the communication unit 620 is further configured to:
  • the emergency call is initiated by the first cell based on the emergency call redial timer, wherein the duration of the emergency call redial timer is less than the duration of the mobile communication network call redial timer.
  • processing unit 610 is further configured to:
  • the emergency call redial is performed before the emergency call redial timer expires.
  • the processing unit 610 is configured to:
  • the communication unit 620 is used to:
  • the emergency call is initiated by the first cell based on the emergency call redial timer, wherein the duration of the emergency call redial timer is less than the The length of time that the mobile communication network calls the redial timer.
  • processing unit 610 is further configured to:
  • the emergency call redial is performed before the emergency call redial timer expires.
  • the processing unit 610 is configured to:
  • the communication unit 620 is used to:
  • the terminal When the terminal successfully initiates the first emergency call to when the terminal initiates the second emergency call, the terminal and the Wifi wireless network remain in a connected state, and the second emergency call is initiated by the Wifi wireless network.
  • processing unit 610 is further configured to:
  • FIG. 7 is another schematic block diagram of a terminal according to an embodiment of the present application.
  • the terminal 700 shown in FIG. 7 includes: a radio frequency (RF) circuit 710, a memory 720, other input devices 730, a display screen 740, a sensor 750, an audio circuit 760, an I/O subsystem 770, a processor 780, and Power 790 and other components.
  • RF radio frequency
  • the terminal structure shown in FIG. 7 does not constitute a limitation of the terminal, and may include more or less components than those illustrated, or combine some components, or split some components, or Different parts are arranged.
  • display screen 740 is a User Interface (UI) and that terminal 700 may include a user interface that is smaller than illustrated or less.
  • UI User Interface
  • the components of the terminal 700 will be specifically described below with reference to FIG. 7:
  • the RF circuit 710 can be used for transmitting and receiving information or during a call, and receiving and transmitting the signal. Specifically, after receiving the downlink information of the base station, the processor 780 processes the data. In addition, the uplink data is designed to be sent to the base station.
  • RF circuits include, but are not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a Low Noise Amplifier (LNA), a duplexer, and the like.
  • LNA Low Noise Amplifier
  • RF circuitry 710 can also communicate with the network and other devices via wireless communication.
  • the wireless communication may use any communication standard or protocol, including but not limited to Global System of Mobile communication (GSM), General Packet Radio Service (GPRS), Code Division Multiple Access (Code). Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Long Term Evolution (LTE), E-mail, Short Messaging Service (SMS), etc.
  • GSM Global System of Mobile communication
  • GPRS General
  • the memory 720 can be used to store software programs and modules, and the processor 780 executes various functional applications and data processing of the terminal 700 by running software programs and modules stored in the memory 720.
  • the memory 720 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application required for at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may be stored according to The data created by the use of the terminal 700 (such as audio data, phone book, etc.) and the like.
  • memory 720 can include high speed random access memory, and can also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.
  • Other input devices 730 can be used to receive input digital or character information, as well as generate key signal inputs related to user settings and function control of terminal 700.
  • other input devices 730 may include, but are not limited to, physical keyboards, function keys (such as volume control buttons, switch buttons, etc.), trackballs, mice, joysticks, and light mice (the light mouse is not sensitive to display visual output).
  • function keys such as volume control buttons, switch buttons, etc.
  • trackballs mice, joysticks, and light mice (the light mouse is not sensitive to display visual output).
  • Other input devices 730 are coupled to other input device controllers 771 of I/O subsystem 770 for signal interaction with processor 780 under the control of other device input controllers 771.
  • Display 740 can be used to display information entered by the user or information provided to the user, as well as various menus of terminal 700, and can also accept user input.
  • the specific display screen 740 can include a display panel 741 and a touch panel 742.
  • the display panel 741 can be configured by using a liquid crystal display (LCD), an organic light-emitting diode (OLED), or the like.
  • the touch panel 742 also referred to as a touch screen, a touch sensitive screen, etc., can collect contact or non-contact operations on or near the user (eg, the user uses any suitable object or accessory such as a finger, a stylus, etc. on the touch panel 742.
  • the operation in the vicinity of the touch panel 742 may also include a somatosensory operation; the operation includes a single-point control operation, a multi-point control operation, and the like, and the corresponding connection device is driven according to a preset program.
  • the touch panel 742 can include two parts: a touch detection device and a touch controller. Wherein, the touch detection device detects the touch orientation and posture of the user, and detects a signal brought by the touch operation, and transmits a signal to the touch controller; the touch controller receives the touch information from the touch detection device, and converts the signal into a processor. The processed information is sent to the processor 780 and can receive commands from the processor 780 and execute them.
  • the touch panel 742 can be implemented by using various types such as resistive, capacitive, infrared, and surface acoustic waves, and the touch panel 742 can be implemented by any technology developed in the future.
  • the touch panel 742 can cover the display panel 741, and the user can display the content according to the display panel 741 (including but not limited to, a soft keyboard, a virtual mouse, a virtual button, an icon, etc.) on the display panel 741. Operation is performed on or near the covered touch panel 742. After detecting the operation thereon or nearby, the touch panel 742 transmits to the processor 780 through the I/O subsystem 770 to determine user input, and then the processor 780 is based on the user.
  • the input provides a corresponding visual output on display panel 741 via I/O subsystem 770.
  • the touch panel 742 and the display panel 741 function as two separate components to implement the input and input functions of the terminal 700, in some embodiments, the touch panel 742 can be integrated with the display panel 741.
  • the input and output functions of the terminal 700 are implemented.
  • Terminal 700 can also include at least one type of sensor 750, such as a light sensor, motion sensor, and other sensors.
  • the light sensor may include an ambient light sensor and a proximity sensor, wherein the ambient light sensor may adjust the brightness of the display panel 741 according to the brightness of the ambient light, and the proximity sensor may close the display panel 741 when the terminal 700 moves to the ear. / or backlight.
  • the accelerometer sensor can detect the magnitude of acceleration in all directions (usually three axes). When it is stationary, it can detect the magnitude and direction of gravity.
  • the gesture of the mobile phone such as horizontal and vertical screen switching, related Game, magnetometer attitude calibration), vibration recognition related functions (such as pedometer, tapping), etc.; as for the terminal 700 can also be configured with gyroscopes, barometers, hygrometers, thermometers, infrared sensors and other sensors, here Let me repeat.
  • An audio circuit 760, a speaker 761, and a microphone 762 can provide an audio interface between the user and the terminal 700.
  • the audio circuit 760 can transmit the converted audio data to the speaker 761 and convert it into a sound signal output by the speaker 761.
  • the microphone 762 converts the collected sound signal into a signal, which is received by the audio circuit 760.
  • the audio data is converted to audio data, which is then output to RF circuitry 710 for transmission to, for example, another handset, or audio data is output to memory 720 for further processing.
  • the I/O subsystem 770 is used to control external devices for input and output, and may include other device input controllers 771, sensor controllers 772, and display controllers 773.
  • one or more other input control device controllers 771 receive signals from other input devices 730 and/or send signals to other input devices 730, which may include physical buttons (press buttons, rocker buttons, etc.) , dial, slide switch, joystick, click wheel, light mouse (light mouse is a touch-sensitive surface that does not display visual output, or an extension of a touch-sensitive surface formed by a touch screen). It is worth noting that other input control device controllers 771 can be connected to any one or more of the above devices.
  • Display controller 773 in I/O subsystem 770 receives signals from display 740 and/or transmits signals to display 740. After the display screen 740 detects the user input, the display controller 773 converts the detected user input into an interaction with the user interface object displayed on the display screen 740, ie, implements human-computer interaction. Sensor controller 772 can receive signals from one or more sensors 750 and/or send signals to one or more sensors 750.
  • Processor 780 is the control center of terminal 700, which connects various portions of the entire terminal using various interfaces and lines, by running or executing software programs and/or modules stored in memory 720, and recalling data stored in memory 720, The various functions and processing data of the terminal 700 are performed to perform overall monitoring of the terminal.
  • the processor 780 can include one or more processing units; optionally, the processor 780 can integrate an application processor and a modem processor, wherein the application processor mainly processes an operating system, a user interface, and an application. Etc.
  • the modem processor primarily handles wireless communications. It will be appreciated that the above described modem processor may also not be integrated into the processor 780.
  • the processor 780 is configured to: acquire an emergency call request, and detect a first frequency band of the mobile communication network; if the energy of the first frequency band is greater than a preset emergency call threshold, The processor performs a cell search in the first frequency band, wherein the emergency call threshold is greater than a first threshold of a mobile communication network frequency band scan. When the first cell is successfully searched in the first frequency band, an emergency call is initiated by the first cell.
  • the processor 780 can perform the functions of the processing unit 610 and the communication unit 620 in FIG.
  • the processor 780 is further configured to:
  • the first threshold is used for frequency band scanning of the mobile communication network when a non-emergency call is made.
  • processor 780 is further configured to:
  • the terminal When the cell is not successfully searched in the first frequency band, or when an emergency call is not successfully initiated in the first frequency band, the terminal detects the second frequency band of the mobile communication network.
  • processor 780 is further configured to:
  • the processor initiates an emergency call through the Wifi wireless network when the cell is not successfully searched in all frequency bands of the mobile communication network, or when an emergency call is not successfully initiated in all frequency bands of the mobile communication network.
  • processor 780 is further configured to:
  • the processor If the processor successfully initiates an emergency call through the Wifi wireless network, the processor initiates a next emergency call through the Wifi wireless network.
  • the processor 780 is further configured to:
  • the terminal when the terminal successfully initiates the emergency call to when the terminal initiates the next emergency call, the terminal and the Wifi wireless network remain in a connected state.
  • the terminal before the terminal detects the first frequency band of the mobile communication network, the terminal does not reside in the mobile communication network.
  • the terminal before the terminal detects the first frequency band of the mobile communication network, the terminal resides in a second cell of the mobile communication network, and the terminal does not successfully initiate an emergency call in the second cell.
  • processor 780 is further configured to:
  • the emergency call is initiated by the first cell based on the emergency call redial timer, wherein the duration of the emergency call redial timer is less than the duration of the mobile communication network call redial timer.
  • processor 780 is further configured to:
  • the emergency call redial is performed before the emergency call redial timer expires.
  • the processor 780 is configured to:
  • the processor 780 is configured to initiate an emergency call by using the emergency call re-dial timer, where the emergency call is redialed.
  • the duration of the timer is less than the duration of the mobile communication network call redial timer.
  • the emergency call is initiated by the first cell based on an emergency call redial timer, including:
  • the emergency call redial is performed before the emergency call redial timer expires.
  • the processor 780 is configured to:
  • the terminal When the terminal successfully initiates the first emergency call to when the terminal initiates the second emergency call, the terminal and the Wifi wireless network remain in a connected state, and the second emergency call is initiated by the Wifi wireless network.
  • processor 780 is further configured to:
  • the terminal 700 also includes a power supply 790 (such as a battery) for powering various components.
  • a power supply 790 (such as a battery) for powering various components.
  • the power supply can be logically coupled to the processor 780 through a power management system to manage functions such as charging, discharging, and power consumption through the power management system.
  • the terminal 700 may further include a camera, a Bluetooth module, and the like, and details are not described herein again.
  • the terminal 700 may correspond to a terminal in an emergency call method according to an embodiment of the present application, and the terminal 700 may include a physical unit for performing a method performed by a terminal or an electronic device in the above method.
  • the physical units in the terminal 700 and the other operations and/or functions described above are respectively used for the corresponding processes of the foregoing methods, and are not described herein again for brevity.
  • the terminal 700 can include physical units in a method for performing the emergency call described above.
  • the physical units in the terminal 700 and the other operations and/or functions described above are respectively used for the corresponding processes of the foregoing methods, and are not described herein again for brevity.
  • the embodiment of the present application further provides a computer readable storage medium storing one or more programs, the one or more programs including instructions, when the portable electronic device is included in a plurality of applications When executed, the portable electronic device can be caused to perform the method of some or all of the illustrated embodiments of FIGS. 2, 3, 4, and 5.
  • the terminal When the instruction is executed by the terminal, the terminal is caused to perform the following steps:
  • the terminal acquires an emergency call request
  • the terminal detects a first frequency band of the mobile communication network
  • the terminal If the energy of the first frequency band is greater than a preset emergency call threshold, the terminal performs a cell search in the first frequency band, where the emergency call threshold is greater than a first threshold of a mobile communication network frequency band scan;
  • the terminal When the terminal successfully searches for the first cell in the first frequency band, the terminal initiates an emergency call by using the first cell.
  • the instruction further includes: the terminal determining that the signal quality of the Wifi wireless network is greater than a predetermined threshold.
  • the first threshold is used for frequency band scanning of the mobile communication network when a non-emergency call is made.
  • the instructions further include:
  • the terminal When the terminal does not successfully search for a cell in the first frequency band, or when the terminal does not successfully initiate an emergency call in the first frequency band, the terminal detects the second frequency band of the mobile communication network.
  • the instructions further include:
  • the terminal When the terminal does not successfully search for a cell in all frequency bands of the mobile communication network, or when the terminal does not successfully initiate an emergency call in all frequency bands of the mobile communication network, the terminal passes the Wifi wireless The network initiates an emergency call.
  • the instructions further include:
  • the terminal If the terminal successfully initiates an emergency call through the Wifi wireless network, the terminal initiates a next emergency call through the Wifi wireless network.
  • the instruction before the terminal initiates the next emergency call by using the Wifi wireless network, the instruction further includes:
  • the terminal determines that the signal quality of the Wifi wireless network is greater than a predetermined threshold.
  • the terminal when the terminal successfully initiates the emergency call to when the terminal initiates the next emergency call, the terminal and the Wifi wireless network remain in a connected state.
  • the terminal before the terminal detects the first frequency band of the mobile communication network, the terminal does not reside in the mobile communication network.
  • the terminal before the terminal detects the first frequency band of the mobile communication network, the terminal resides in a second cell of the mobile communication network, and the terminal does not successfully initiate an emergency call in the second cell.
  • the initiating an emergency call by using the first cell includes:
  • the terminal initiates an emergency call by using the emergency call re-dial timer, wherein the duration of the emergency call redial timer is less than the duration of the mobile communication network call redial timer.
  • the emergency call is initiated by the first cell based on an emergency call redial timer, including:
  • the emergency call redial is performed before the emergency call redial timer expires.
  • the terminal when the instruction is executed by the terminal, the terminal is caused to perform the following steps:
  • the terminal performs cell search in the mobile communication network
  • the terminal When the mobile communication network successfully searches for the first cell, the terminal initiates an emergency call by using the emergency call re-dial timer, wherein the duration of the emergency call redial timer is less than the The length of time that the mobile communication network calls the redial timer.
  • the emergency call is initiated by the first cell based on an emergency call redial timer, including:
  • the emergency call redial is performed before the emergency call redial timer expires.
  • the terminal when the instruction is executed by the terminal, the terminal is caused to perform the following steps:
  • the terminal determines that the first emergency call is successfully initiated through the Wifi wireless network
  • the terminal When the terminal successfully initiates the first emergency call to when the terminal initiates a second emergency call, the terminal and the Wifi wireless network remain in a connected state, and the terminal initiates a second through the Wifi wireless network. Emergency call.
  • the instructions further include:
  • the terminal determines that the signal quality of the Wifi wireless network is greater than a predetermined threshold.
  • the processor in FIG. 7 in the embodiment of the present application may be an integrated circuit chip with signal processing capability.
  • each step of the foregoing method embodiment may be completed by an integrated logic circuit of hardware in a processor or an instruction in a form of software.
  • the processor may be a central processing unit (CPU), the processor may be another general-purpose processor, a digital signal processor (DSP), or an application specific integrated circuit (ASIC). ), Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components.
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software in the decoding processor.
  • the software can be located in a random storage medium, such as a flash memory, a read only memory, a programmable read only memory or an electrically erasable programmable memory, a register, and the like.
  • the storage medium is located in the memory, and the processor reads the information in the memory and combines the hardware to complete the steps of the above method.
  • the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory may be a read-only memory (ROM), a programmable read only memory (PROM), an erasable programmable read only memory (Erasable PROM, EPROM), or an electric Erase programmable read only memory (EEPROM) or flash memory.
  • the volatile memory can be a Random Access Memory (RAM) that acts as an external cache.
  • RAM Random Access Memory
  • many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (Synchronous DRAM).
  • SDRAM Double Data Rate SDRAM
  • DDR SDRAM Double Data Rate SDRAM
  • ESDRAM Enhanced Synchronous Dynamic Random Access Memory
  • SLDRAM Synchronous Connection Dynamic Random Access Memory
  • DR RAM direct memory bus random access memory
  • bus system may include a power bus, a control bus, a status signal bus, and the like in addition to the data bus.
  • bus systems may include a power bus, a control bus, a status signal bus, and the like in addition to the data bus.
  • various buses are labeled as bus systems in the figure.
  • B corresponding to A means that B is associated with A, and B can be determined according to A.
  • determining B from A does not mean that B is only determined based on A, and that B can also be determined based on A and/or other information.
  • the term "and/or” herein is merely an association relationship describing an associated object, indicating that there may be three relationships, for example, A and/or B, which may indicate that A exists separately while 10 is stored in A. And B, there are three cases of B alone.
  • the character "/" in this article generally indicates that the contextual object is an "or" relationship.
  • each step of the above method may be completed by an integrated logic circuit of hardware in a processor or an instruction in a form of software.
  • the steps of the method for transmitting an uplink signal disclosed in the embodiments of the present application may be directly implemented as hardware processor execution completion, or performed by a combination of hardware and software in a processor.
  • the software can be located in a random storage medium, such as a flash memory, a read only memory, a programmable read only memory or an electrically erasable programmable memory, a register, and the like.
  • the storage medium is located in the memory, and the processor reads the information in the memory and combines the hardware to complete the steps of the above method. To avoid repetition, it will not be described in detail here.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product.
  • the technical solution of the present application which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including
  • the instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present application.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

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Abstract

本申请提供了一种紧急呼叫的方法和终端，该方法包括：终端获取紧急呼叫请求；该终端检测移动通信网络的第一频段；若该第一频段的能量大于预设的紧急呼叫门限，则该终端在该第一频段内进行小区搜索，其中，该紧急呼叫门限大于移动通信网络频段扫描的第一门限；该终端在所述第一频段内成功搜索到第一小区时，通过该第一小区发起紧急呼叫。本申请实施例的技术方案，通过采用预设的紧急呼叫门限进行搜索网络，从而减少紧急呼叫搜索网络的时间，提高用户的体验感。

Description

紧急呼叫的方法和终端 技术领域
本申请涉及终端领域，尤其涉及一种终端的紧急呼叫的方法和终端。
背景技术
当室内环境下无线保真(Wireless-Fidelity，Wifi)信号较好，移动信号较弱时。基于Wifi的语音通话业务(Voice Over Wifi，VoWifi)的通话质量相对较好，而通过移动通信网络建立的语音通话业务的信号质量较差，甚至无法成功建立语音通话业务。但根据紧急呼叫的域选优先级，需要先在移动通信网络上发起紧急呼叫。只有在移动通信网络，例如，在移动通信网络的电路交换(Circuit Switching，CS)域或IP多媒体子系统(IP Multimedia Subsystem，IMS)通用移动通信技术的长期演进(Long Term Evolution，LTE)域，未成功发起紧急呼叫时，才能够通过Wifi无线网络发起语音通话业务。
因此，当Wifi无线网络信号质量较好，移动网络信号质量较弱的场景下，可能会耗费较长的时间才会在Wifi无线网络上发起紧急呼叫，从而导致用户体验较差。
发明内容
本申请提供一种紧急呼叫的方法和终端，有利于提高用户体验感。
第一方面，提供了一种紧急呼叫的方法，包括：终端获取紧急呼叫请求；该终端检测移动通信网络的第一频段；若该第一频段的能量大于预设的紧急呼叫门限，则该终端在该第一频段内进行小区搜索，其中，该紧急呼叫门限大于移动通信网络频段扫描的第一门限；该终端在该第一频段内成功搜索到第一小区时，通过该第一小区发起紧急呼叫。
在本申请实施例的技术方案中，通过采用预设的紧急呼叫门限进行搜索网络，其中预设的紧急门限大于移动通信网络用于搜索网络的第一门限，缩短了紧急呼叫的搜索网络的时间，从而提高用户的体验感。
结合第一方面，在第一方面的某些实现方式中，在该终端检测移动通信网络的第一频段之前，该方法还包括：该终端确定Wifi无线网络的信号质量大于预定门限。
在某些可能的实现方式中，针对移动通信网络包括电路交换CS域和/或IMS LTE域的不同情况，终端发起紧急呼叫的域选方式可以包括但不限定为以下方式：
方式一：终端可以先在CS域发起紧急呼叫，若CS域未成功发起紧急呼叫时，接着终端在IMS LTE发起紧急呼叫。
当终端在IMS LTE域未成功发起紧急呼叫时，则在IP多媒体子系统(IP Multimedia Subsystem，IMS)无线保真(Wireless-Fidelity，WIFI)域，即IMS WIFI域发起紧急呼叫。
方式二：终端可以先在IMS LTE域发起紧急呼叫，若IMS LTE域未成功发起紧急呼叫时，接着终端在CS域发起紧急呼叫。
当终端在CS域未成功发起紧急呼叫时，则在IMS WIFI域发起紧急呼叫。
结合第一方面，在第一方面的某些实现方式中，该第一门限用于非紧急呼叫时移动通信网络的频段扫描。
在某些可能的实现方式中，预设的紧急呼叫门限可以用于包括但不限定为以下场景：
场景一：CS域紧急呼叫的门限可以为预设的紧急呼叫门限，IMS LTE域紧急呼叫的门限可以为普通呼叫时频段能量的扫描门限，即IMS LTE域紧急呼叫的门限可以为移动通信网络频段扫描的第一门限。
场景二：IMS LTE域紧急呼叫的门限可以为预设的紧急呼叫门限，CS域紧急呼叫的门限可以为普通呼叫时频段能量的扫描门限，即CS域紧急呼叫的门限可以为移动通信网络频段扫描的第一门限。
场景三：CS域紧急呼叫的门限、IMS LTE域紧急呼叫的门限可以均为预设的紧急呼叫门限。
在本申请实施例的技术方案中，在发起紧急呼叫时，通过在移动通信网络采用预设的紧急呼叫的门限，缩短了紧急呼叫在移动通信网络的搜索网络的时间，从而减少用户的等待时间，提高用户的体验感。
结合第一方面，在第一方面的某些实现方式中，该方法还包括：该终端在该第一频段内未成功搜索到小区时，或者，该终端在该第一频段内未成功发起紧急呼叫时，该终端检测所述移动通信网络的第二频段。
结合第一方面，在第一方面的某些实现方式中，该方法还包括：该终端在该移动通信网络的所有频段内未成功搜索到小区时，或者，该终端在该移动通信网络的所有频段内未成功发起紧急呼叫时，该终端通过该Wifi无线网络发起紧急呼叫。
结合第一方面，在第一方面的某些实现方式中，该方法还包括：若该终端通过该Wifi无线网络成功发起紧急呼叫，则该终端通过该Wifi无线网络发起下一次紧急呼叫。
结合第一方面，在第一方面的某些实现方式中，该终端通过该Wifi无线网络发起下一次紧急呼叫之前，该方法还包括：该终端确定该Wifi无线网络的信号质量大于预定门限。
结合第一方面，在第一方面的某些实现方式中，从该终端成功发起该紧急呼叫时至该终端发起该下一次紧急呼叫时，该终端与该Wifi无线网络一直保持连接状态。
在本申请实施例的技术方案中，通过优先采用成功发起过紧急呼叫，且一直与终端处于连接状态的信号质量较好的Wifi无线网络发起紧急呼叫，能够提高终端发起紧急呼叫时的搜索网络的效率，提高用户的体验感。
结合第一方面，在第一方面的某些实现方式中，该终端检测移动通信网络的第一频段之前，该终端未驻留在该移动通信网络。
结合第一方面，在第一方面的某些实现方式中，该终端检测移动通信网络的第一频段之前，该方法包括：该终端驻留在该移动通信网络的第二小区，且该终端在该第二小区未成功发起紧急呼叫。
结合第一方面，在第一方面的某些实现方式中，通过该第一小区发起紧急呼叫，包括：
该终端基于紧急呼叫重拨定时器，通过该第一小区发起紧急呼叫，其中，该紧急呼叫重拨定时器的时长小于该移动通信网络呼叫重拨定时器的时长。
结合第一方面，在第一方面的某些实现方式中，该基于紧急呼叫重拨定时器，通过该 第一小区发起紧急呼叫，包括：若通过该第一小区发起的紧急呼叫失败，则在该紧急呼叫重拨定时器超时前进行紧急呼叫重拨。
在本申请实施例的技术方案中，在终端发起紧急呼叫时，通过采用紧急呼叫重拨定时器，能够在紧急呼叫失败时的较短时间内终端再次发起重拨，从而缩短了紧急呼叫时用户的等待时间，提高用户的体验感。
第二方面，提供了一种紧急呼叫的方法，包括：在非紧急呼叫时，终端采用第一门限进行第一频段的质量检测；在紧急呼叫时，该终端采用预设的紧急呼叫门限进行第一频段的质量检测；在终端获取紧急呼叫请求时，该终端检测移动通信网络的第一频段；若该第一频段的能量大于预设的紧急呼叫门限，则该终端在该第一频段内进行小区搜索，其中，该紧急呼叫门限大于移动通信网络频段扫描的第一门限；该终端在该第一频段内成功搜索到第一小区时，通过该第一小区发起紧急呼叫。
在本申请实施例的技术方案中，通过采用预设的紧急呼叫门限进行搜索网络，其中预设的紧急门限大于移动通信网络用于搜索网络的第一门限，缩短了紧急呼叫的搜索网络的时间，从而提高用户的体验感。
应理解，在本申请的实施例中，紧急呼叫，例如，拨打911、110、119、120等报警或求救号码等号码；非紧急呼叫，例如，拨打10086或者正常的普通号码呼叫。
结合第二方面，在第二方面的某些实现方式中，该方法还包括：若该终端通过该Wifi无线网络成功发起紧急呼叫，则该终端通过该Wifi无线网络发起下一次紧急呼叫。
结合第二方面，在第二方面的某些实现方式中，该终端通过该Wifi无线网络发起下一次紧急呼叫之前，该方法还包括：该终端确定该Wifi无线网络的信号质量大于预定门限。
结合第二方面，在第二方面的某些实现方式中，从该终端成功发起该紧急呼叫时至该终端发起该下一次紧急呼叫时，该终端与该Wifi无线网络一直保持连接状态。
在本申请实施例的技术方案中，通过优先采用成功发起过紧急呼叫，且一直与终端处于连接状态的信号质量较好的Wifi无线网络发起紧急呼叫，能够提高终端发起紧急呼叫时的搜索网络的效率，提高用户的体验感。
结合第二方面，在第二方面的某些实现方式中，该终端检测移动通信网络的第一频段之前，该终端未驻留在该移动通信网络。
结合第二方面，在第二方面的某些实现方式中，该终端检测移动通信网络的第一频段之前，该方法包括：该终端驻留在该移动通信网络的第二小区，且该终端在该第二小区未成功发起紧急呼叫。
结合第二方面，在第二方面的某些实现方式中，通过该第一小区发起紧急呼叫，包括：
该终端基于紧急呼叫重拨定时器，通过该第一小区发起紧急呼叫，其中，该紧急呼叫重拨定时器的时长小于该移动通信网络呼叫重拨定时器的时长。
结合第二方面，在第二方面的某些实现方式中，该基于紧急呼叫重拨定时器，通过该第一小区发起紧急呼叫，包括：若通过该第一小区发起的紧急呼叫失败，则在该紧急呼叫重拨定时器超时前进行紧急呼叫重拨。
在本申请实施例的技术方案中，在终端发起紧急呼叫时，通过采用紧急呼叫重拨定时器，能够在紧急呼叫失败时的较短时间内终端再次发起重拨，从而缩短了紧急呼叫时用户 的等待时间，提高用户的体验感。
第三方面，提供了一种紧急呼叫的方法，包括：终端在移动通信网络进行小区搜索；该终端在该移动通信网络成功搜索到第一小区时，基于紧急呼叫重拨定时器，通过该第一小区发起紧急呼叫，其中，该紧急呼叫重拨定时器的时长小于该移动通信网络呼叫重拨定时器的时长。
本申请实施例的技术方案中，在终端发起紧急呼叫时，通过采用紧急呼叫重拨定时器，能够在紧急呼叫失败时的较短时间内终端再次发起重拨，从而缩短了紧急呼叫时用户的等待时间，提高用户的体验感。
结合第三方面，在第三方面的某些实现方式中，基于紧急呼叫重拨定时器，通过该第一小区发起紧急呼叫，包括：若通过该第一小区发起的紧急呼叫失败，则在该紧急呼叫重拨定时器超时前进行紧急呼叫重拨。
第四方面，提供了一种紧急呼叫的方法，包括：若终端进行非紧急呼叫，在非紧急呼叫失败时采用移动通信网络呼叫重拨定时器进行重拨；若终端进行紧急呼叫，在紧急呼叫失败时采用紧急呼叫重拨定时器进行重拨；当终端进行紧急呼叫时，终端在移动通信网络进行小区搜索；该终端在该移动通信网络成功搜索到第一小区时，基于紧急呼叫重拨定时器，通过该第一小区发起紧急呼叫，其中，该紧急呼叫重拨定时器的时长小于该移动通信网络呼叫重拨定时器的时长。
本申请实施例的技术方案中，在终端发起紧急呼叫时，通过采用紧急呼叫重拨定时器，能够在紧急呼叫失败时的较短时间内终端再次发起重拨，从而缩短了紧急呼叫时用户的等待时间，提高用户的体验感。
结合第四方面，在第四方面的某些实现方式中，基于紧急呼叫重拨定时器，通过该第一小区发起紧急呼叫，包括：若通过该第一小区发起的紧急呼叫失败，则在该紧急呼叫重拨定时器超时前进行紧急呼叫重拨。
第五方面，提供了一种紧急呼叫的方法，包括：终端确定通过Wifi无线网络成功发起过第一紧急呼叫；从该终端成功发起该第一紧急呼叫时至该终端发起第二紧急呼叫时，该终端与该Wifi无线网络一直保持连接状态，该终端通过该Wifi无线网络发起第二紧急呼叫。
在本申请实施例的技术方案中，通过优先采用成功发起过紧急呼叫，且一直与终端处于连接状态的Wifi无线网络发起紧急呼叫，能够提高终端发起紧急呼叫时的搜索网络的效率，提高用户的体验感。
结合第五方面，在第五方面的某些实现方式中，该方法还包括：该终端确定该Wifi无线网络的信号质量大于预定门限。
第六方面，提供了一种终端，包括：射频电路；一个或多个处理器；存储器；多个应用程序；以及一个或多个计算机程序，其中所述一个或多个计算机程序被存储在所述存储器中，所述一个或多个计算机程序包括指令，当所述指令被所述终端执行时，使得所述终端执行以下步骤：
获取紧急呼叫请求；检测移动通信网络的第一频段；若所述第一频段的能量大于预设的紧急呼叫门限，则所述终端在所述第一频段内进行小区搜索，其中，所述紧急呼叫门限大于移动通信网络频段扫描的第一门限；在所述第一频段内成功搜索到第一小区时，通过 所述第一小区发起紧急呼叫。
结合第六方面，在第六方面的某些实现方式中，在所述终端检测移动通信网络的第一频段之前，所述指令还包括：确定Wifi无线网络的信号质量大于预定门限。
结合第六方面，在第六方面的某些实现方式中，所述第一门限用于非紧急呼叫时所述移动通信网络的频段扫描。
结合第六方面，在第六方面的某些实现方式中，所述指令还包括：在所述第一频段内未成功搜索到小区时，或者，在所述第一频段内未成功发起紧急呼叫时，检测所述移动通信网络的第二频段。
结合第六方面，在第六方面的某些实现方式中，所述指令还包括：在所述移动通信网络的所有频段内未成功搜索到小区时，或者，在所述移动通信网络的所有频段内未成功发起紧急呼叫时，通过所述Wifi无线网络发起紧急呼叫。
结合第六方面，在第六方面的某些实现方式中，所述指令还包括：若通过所述Wifi无线网络成功发起紧急呼叫，则通过所述Wifi无线网络发起下一次紧急呼叫。
结合第六方面，在第六方面的某些实现方式中，所述终端通过所述Wifi无线网络发起下一次紧急呼叫之前，所述指令还包括：确定所述Wifi无线网络的信号质量大于预定门限。
结合第六方面，在第六方面的某些实现方式中，从所述终端成功发起所述紧急呼叫时至所述终端发起所述下一次紧急呼叫时，所述终端与所述Wifi无线网络一直保持连接状态。
结合第六方面，在第六方面的某些实现方式中，所述检测移动通信网络的第一频段之前，所述终端未驻留在所述移动通信网络。
结合第六方面，在第六方面的某些实现方式中，所述检测移动通信网络的第一频段之前，所述终端驻留在所述移动通信网络的第二小区，且所述终端在所述第二小区未成功发起紧急呼叫。
结合第六方面，在第六方面的某些实现方式中，所述通过所述第一小区发起紧急呼叫，包括：
基于紧急呼叫重拨定时器，通过所述第一小区发起紧急呼叫，其中，所述紧急呼叫重拨定时器的时长小于所述移动通信网络呼叫重拨定时器的时长。
结合第六方面，在第六方面的某些实现方式中，所述基于紧急呼叫重拨定时器，通过所述第一小区发起紧急呼叫，包括：
若通过所述第一小区发起的紧急呼叫失败，则在所述紧急呼叫重拨定时器超时前进行紧急呼叫重拨。
第七方面，提供了一种终端，包括：射频电路；一个或多个处理器；存储器；多个应用程序；以及一个或多个计算机程序，其中所述一个或多个计算机程序被存储在所述存储器中，所述一个或多个计算机程序包括指令，当所述指令被所述终端执行时，使得所述终端执行以下步骤：
在移动通信网络进行小区搜索；
在所述移动通信网络成功搜索到第一小区时，基于紧急呼叫重拨定时器，通过所述第一小区发起紧急呼叫，其中，所述紧急呼叫重拨定时器的时长小于所述移动通信网络呼叫 重拨定时器的时长。
结合第七方面，在第七方面的某些实现方式中，所述基于紧急呼叫重拨定时器，通过所述第一小区发起紧急呼叫，包括：
若通过所述第一小区发起的紧急呼叫失败，则在所述紧急呼叫重拨定时器超时前进行紧急呼叫重拨。
第八方面，提供了一种终端，包括：射频电路；一个或多个处理器；存储器；多个应用程序；以及一个或多个计算机程序，其中所述一个或多个计算机程序被存储在所述存储器中，所述一个或多个计算机程序包括指令，当所述指令被所述终端执行时，使得所述终端执行以下步骤：
确定通过Wifi无线网络成功发起过第一紧急呼叫；
从所述终端成功发起所述第一紧急呼叫时至所述终端发起第二紧急呼叫时，所述终端与所述Wifi无线网络一直保持连接状态，所述终端通过所述Wifi无线网络发起第二紧急呼叫。
结合第八方面，在第八方面的某些实现方式中，所述指令还包括：确定所述Wifi无线网络的信号质量大于预定门限。
第九方面，提供了一种终端，该终端包括：处理单元，用于获取紧急呼叫请求；所述处理单元，还用于检测移动通信网络的第一频段；若所述第一频段的能量大于预设的紧急呼叫门限，则所述处理单元还用于在所述第一频段内进行小区搜索，其中，所述紧急呼叫门限大于移动通信网络频段扫描的第一门限；通信单元，用于在所述第一频段内成功搜索到第一小区时，通过所述第一小区发起紧急呼叫。
结合第九方面，在第九方面的某些实现方式中，在所述终端检测移动通信网络的第一频段之前，所述处理单元还用于：确定Wifi无线网络的信号质量大于预定门限。
结合第九方面，在第九方面的某些实现方式中，所述第一门限用于非紧急呼叫时所述移动通信网络的频段扫描。
结合第九方面，在第九方面的某些实现方式中，所述处理单元还用于：在所述第一频段内未成功搜索到小区时，或者，在所述第一频段内未成功发起紧急呼叫时，检测所述移动通信网络的第二频段。
结合第九方面，在第九方面的某些实现方式中，所述通信单元还用于：在所述移动通信网络的所有频段内未成功搜索到小区时，或者，在所述移动通信网络的所有频段内未成功发起紧急呼叫时，通过所述Wifi无线网络发起紧急呼叫。
结合第九方面，在第九方面的某些实现方式中，所述通信单元还用于：若所述终端通过所述Wifi无线网络成功发起紧急呼叫，则通过所述Wifi无线网络发起下一次紧急呼叫。
结合第九方面，在第九方面的某些实现方式中，所述终端通过所述Wifi无线网络发起下一次紧急呼叫之前，所述处理单元还用于：
确定所述Wifi无线网络的信号质量大于预定门限。
结合第九方面，在第九方面的某些实现方式中，从所述终端成功发起所述紧急呼叫时至所述终端发起所述下一次紧急呼叫时，所述终端与所述Wifi无线网络一直保持连接状态。
结合第九方面，在第九方面的某些实现方式中，所述终端检测移动通信网络的第一频 段之前，所述终端未驻留在所述移动通信网络。
结合第九方面，在第九方面的某些实现方式中，所述终端检测移动通信网络的第一频段之前，所述终端驻留在所述移动通信网络的第二小区，且所述终端在所述第二小区未成功发起紧急呼叫。
结合第九方面，在第九方面的某些实现方式中，所述通信单元还用于：基于紧急呼叫重拨定时器，通过所述第一小区发起紧急呼叫，其中，所述紧急呼叫重拨定时器的时长小于所述移动通信网络呼叫重拨定时器的时长。
结合第九方面，在第九方面的某些实现方式中，处理单元还用于：若通过所述第一小区发起的紧急呼叫失败，则在所述紧急呼叫重拨定时器超时前进行紧急呼叫重拨。
第十方面，提供了一种终端，该终端包括：处理单元，用于在移动通信网络进行小区搜索；通信单元，用于在处理单元在所述移动通信网络成功搜索到第一小区时，基于紧急呼叫重拨定时器，通过所述第一小区发起紧急呼叫，其中，所述紧急呼叫重拨定时器的时长小于所述移动通信网络呼叫重拨定时器的时长。
结合第十方面，在第十方面的某些实现方式中，所述处理单元还用于：若通过所述第一小区发起的紧急呼叫失败，则在所述紧急呼叫重拨定时器超时前进行紧急呼叫重拨。
第十一方面，提供了一种终端，该终端包括：处理单元，用于确定所述终端通过Wifi无线网络成功发起过第一紧急呼叫；通信单元，用于从所述终端成功发起所述第一紧急呼叫时至所述终端发起第二紧急呼叫时，所述终端与所述Wifi无线网络一直保持连接状态，通过所述Wifi无线网络发起第二紧急呼叫。
结合第十一方面，在第十一方面的某些实现方式中，确定所述Wifi无线网络的信号质量大于预定门限。
第十二方面，提供了一种终端，包括存储器、处理器和显示器，该存储器用于存储计算机程序，处理器用于从存储器中调用并运行计算机程序，当程序被运行时，该处理器执行上述第一方面或第一方面任意可能的实现方式中的方法。
第十三方面，提供一种计算机可读介质，用于存储计算机程序，该计算机程序包括用于执行第一方面至第五方面中的任一方面或其任一种可能实现方式中的方法的指令。
第十四方面，提供了一种包含指令的计算机程序产品，其在计算机上运行时，使得计算机执行上述第一方面至第五方面中的任一方面或其任一可能的实现方式中的方法。
附图说明
图1是根据本申请实施例应用的一种系统的示意图。
图2是根据本申请一个实施例的紧急呼叫的方法的示意性流程图。
图3是根据本申请另一个实施例的紧急呼叫的方法的示意性流程图。
图4是根据本申请另一个实施例的紧急呼叫的方法的示意性流程图。
图5是根据本申请另一个实施例的紧急呼叫的方法的示意性流程图。
图6是根据本申请一个实施例的终端的示意性框图。
图7是根据本申请另一个实施例的终端的示意性框图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
图1给出了本申请实施例应用的一种系统的示意图。如图1所示，系统100可以包括网络设备102以及终端104和106，其中，网络设备与终端之间通过无线连接。应理解，图1仅以系统包括一个网络设备为例进行说明，但本申请实施例并不限于此，例如，系统还可以包括更多的网络设备；类似地，系统也可以包括更多的终端。还应理解，系统也可以称为网络，本申请实施例对此并不限定。
本说明书结合终端描述了各个实施例。终端可以指终端设备，也可以指用户设备(User Equipment，UE)、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、无线通信设备、用户代理或用户装置。接入终端可以是蜂窝电话、无绳电话、会话启动协议(Session Initiation Protocol，SIP)电话、无线本地环路(Wireless Local Loop，WLL)站、个人数字处理(Personal Digital Assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备，未来5G网络中的终端或者未来演进的公共陆地移动网络(Public Land Mobile Network，PLMN)网络中的终端等。
作为示例而非限定，在本申请实施例中，该终端还可以是可穿戴设备。可穿戴设备也可以称为穿戴式智能设备，是应用穿戴式技术对日常穿戴进行智能化设计、开发出可以穿戴的设备的总称，如眼镜、手套、手表、服饰及鞋等。可穿戴设备即直接穿在身上，或是整合到用户的衣服或配件的一种便携式设备。可穿戴设备不仅仅是一种硬件设备，更是通过软件支持以及数据交互、云端交互来实现强大的功能。广义穿戴式智能设备包括功能全、尺寸大、可不依赖智能手机实现完整或者部分的功能，例如：智能手表或智能眼镜等，以及只专注于某一类应用功能，需要和其它设备如智能手机配合使用，如各类进行体征监测的智能手环、智能首饰等。
本说明书结合网络设备描述了各个实施例。网络设备可以是用于与终端通信的设备，该网络设备可以是全球移动通讯(Global System of Mobile communication，GSM)或码分多址(Code Division Multiple Access，CDMA)中的基站(Base Transceiver Station，BTS)，也可以是宽带码分多址(Wideband Code Division Multiple Access，WCDMA)系统中的基站(NodeB，NB)，还可以是长期演进(Long Term Evolution，LTE)系统中的演进型基站(Evolutional Node B，eNB或eNodeB)，还可以是云无线接入网络(Cloud Radio Access Network，CRAN)场景下的无线控制器，或者该网络设备可以为中继站、接入点、车载设备、可穿戴设备以及未来5G网络中的网络设备或者未来演进的PLMN网络中的网络设备等。
另外，在本申请实施例中，网络设备为小区提供服务，终端通过该小区使用的传输资源(例如，频域资源，或者说，频谱资源)与网络设备进行通信，该小区可以是网络设备(例如基站)对应的小区，小区可以属于宏基站，也可以属于小小区(Small cell)对应的基站，这里的小小区可以包括：城市小区(Metro cell)、微小区(Micro cell)、微微小区(Pico cell)、毫微微小区(Femto cell)等，这些小小区具有覆盖范围小、发射功率低的特点，适用于提供高速率的数据传输服务。另外，该小区还可以是超小区(Hyper cell)。
现有技术中，用户发起普通呼叫时，终端会根据域选优先级，选择域进行网络搜索和注册。此处以在终端设置移动通信网络优先级大于IMS WIFI域优先级为例说明。其中， 移动通信网络包括电路交换CS域和/或IMS LTE域。
当终端收到用户的普通呼叫请求时，会先判断此时终端是否已经驻留在移动通信网络，若终端已经驻留移动通信网络，则终端直接通过该移动通信网络发起普通呼叫。
若终端未驻留在移动通信网络，则终端开始进行移动通信网络的搜索网络和注册阶段。
此处以CS域中WCDMA小区搜索的方法为例进行说明。在WCDMA系统中，终端为了获取网络的服务，需要先搜索到网络并发起注册，终端寻找网络的过程称为小区搜索。现有技术中的小区搜索，首先要获取频段。在获取的频段内按照预设的步进抽取粗扫频点，将粗扫频点的接收信号强度指示(Received Signal Strength Indication，RSSI)值与第一门限进行比较。在抽取粗扫频点的RSSI值大于第一门限时，对该频点所在的频段进行细扫，此处的频段可以理解为该频点所在的一个步进的频段。
此处，第一门限可以为预设的RSSI门限。
通过粗扫描的频点进行基于物理小区搜索的细扫，主要采用三步法搜索。所谓三步法是指，第一步通过主信道同步(Primary Synchronization Code Channel，PSCH)寻找到WCDMA信号的时隙头，第二步通过辅同步信道(Secondary Synchronization Channel，SSCH)寻找WCDMA信号的帧头和扰码组号，第三步通过公共导频信道(Common Pilot Channel，CPICH)寻找WCDMA信号的扰码号。上述三步法搜索网络中，任一步搜索不成功则退出，选取给定频段内下一个通过粗扫描的频点，并重新开始三步法搜索，只有三步搜索都成功的频点才能成为WCDMA频点。终端在该WCDMA频点开始小区驻留流程，当小区搜索和注册均成功后，终端发起普通呼叫。
应理解，在本申请的实施例中，例如，第一门限可以为预设RSSI门限。RSSI为：在接收到信道内的所有信号(包括导频信号、数据信号、邻区干扰信号和噪音信号等)功率的平均值。或者，第一门限可以为预设的参考信号接收功率(Reference Signal Receiving Power，RSRP)门限，RSRP为:在测量频带上，承载小区专属参考信号的资源粒子的功率贡献(以W为单位)的线性平均值。但本申请对此不作限定。
需要说明的是，对于普通呼叫用户可以设置终端域选的优先级顺序。
例如，用户可以根据当前的网络信号质量情况在终端上设置发起普通呼叫时域的优先级顺序。
对于紧急呼叫而言，终端域选的优先级为根据协议规定的顺序，即移动通信网络大于WIFI网络的优先级。即在发起紧急呼叫时，域选的优先级为协议规定的顺序，用户无法根据网络信号质量设置终端域选的优先级顺序。
因此，当终端接收到紧急呼叫请求，发起紧急呼叫时，终端需要首先在移动通信网络上进行网络搜索和注册。若在移动通信网络未成功发起紧急呼叫时，终端才会基于Wifi无线网络发起紧急呼叫。
按照当前流程，在紧急呼叫时，终端在移动通信网络中仍采用上述第一门限进行频段扫描。当移动通信网络信号质量较差但Wifi无线网络的访问参数高于切换门限，例如，Wifi无线网络信号质量较好时，终端发起紧急呼叫仍然必须先在信号质量较差的移动通信网络上搜索网络和注册。当在移动通信网络未成功发起紧急呼叫时，才能在信号质量较好的Wifi无线网络下发起紧急呼叫。此时，终端在移动通信网络中进行网络搜索和注册已 经花费大量的时间。
在本申请的实施例中，Wifi无线网络的访问参数高于切换门限(无线网络访问阈值)，切换门限可以为以下参数，例如，接收的信号强度指示(Received Signal Strength Indicator，RSSI)的阈值，或者，误块率(Block Error Rate，BLER)的阈值，误块率即出错的块在所有发送的块中所占的百分比，或者，信道利用率的阈值。
因此，将当前普通呼叫的频段扫描的第一门限用于紧急呼叫的网络搜索和注册阶段，会影响紧急呼叫时语音业务的速度和质量。
在本申请的实施例中，终端通过采用预设的紧急呼叫门限进行频段能量的扫描，其中，预设的紧急呼叫门限高于第一门限。从而缩短了紧急呼叫的搜索网络与注册时间，提高了用户体验感。
下面，将详细描述根据本申请实施例的紧急呼叫的方法。
图2是根据本申请一个实施例的紧急呼叫的方法的示意性流程图。图2所示的方法由终端执行，例如，可以由图1所示的终端执行。
应理解，在本申请的各实施例中，“第一”、“第二”等仅是为了指代不同的对象，并不表示对指代的对象有其它限定。
应理解，在本申请的实施例中，第一频段的能量可以为第一频段上预定频点处的能量，例如，预设频点可以为粗扫频点，在给定频段内按照设定的步进抽取粗扫频点，例如，步进取值为10，则在粗扫频点10处的能量大于预设的紧急呼叫门限时，对频点1至频点10的所在的第一频段中包括的所有频点进行细扫。此时，可以认为第一频段的能量大于预设的紧急呼叫门限。本申请对此不作限定。
S201，终端获取到紧急呼叫请求时，终端检测移动通信网络的第一频段。
例如，终端接收到了用户的紧急呼叫拨号时，根据预定的域选优先级，先检测移动通信网络。
例如，若终端获取到紧急呼叫请求时，所述终端未驻留在移动通信网络，则开始检测移动通信网络。或者，若终端此时已经驻留移动通信网络，则终端可以直接在驻留的移动通信网络上发起紧急呼叫。或者，若终端未成功发起紧急呼叫，则重新检测移动通信网络。
针对移动通信网络包括CS域和/或IMS LTE域的不同情况，终端发起紧急呼叫的域选方式可以包括但不限定为以下方式：
方式一：终端可以先在CS域发起紧急呼叫，若CS域未成功发起紧急呼叫时，接着终端在IMS LTE发起紧急呼叫。
当终端在IMS LTE域未成功发起紧急呼叫时，则在IMS WIFI域发起紧急呼叫。
方式二：终端可以先在IMS LTE域发起紧急呼叫，若IMS LTE域未成功发起紧急呼叫时，接着终端在CS域发起紧急呼叫。
当终端在CS域未成功发起紧急呼叫时，则在IMS WIFI域发起紧急呼叫。
可选地，在本申请的实施例中，当终端未驻留在CS域时，终端开始CS域的搜索网络和注册的阶段，例如，终端可以获取CS域内的第一频段，并对第一频段的能量进行检测。此处的第一频段可以为CS域中的任意频段。
可选地，在本申请的实施例中，当终端未驻留在IMS LTE网络时，终端开始IMS LTE域的搜索网络的阶段，例如，终端可以获取IMS LTE域内的第一频段，并对第一频段的 能量进行检测。此处的第一频段可以为IMS LTE域中的任意频段。
S202，终端判断当前第一频段的能量是否大于预设的紧急呼叫门限，其中，所述紧急呼叫门限大于移动通信网络频段扫描的第一门限。若所述第一频段的能量大于预设的紧急呼叫门限，则执行S203。
需要说明的是，第一门限用于非紧急呼叫时移动通信网络的频段扫描。例如，第一门限可以为普通呼叫时的RSSI门限，本申请对此不作限定。
S203，所述终端在第一频段内进行小区搜索。
可选地，在本申请的实施例中，例如，当终端未驻留在CS网络时且Wifi无线网络信号质量较好时发起紧急呼叫，基于频段能量扫描的预设的紧急呼叫门限大于普通呼叫时频段能量的扫描门限，由此初步筛选出CS域的第一频段中的高质量的频点，并在筛选出的频点处进行物理小区的搜索。
通过提高紧急呼叫时第一频段扫描的门限，减少第一频段中进行小区搜索的频点数量，由此减少紧急呼叫时终端在CS域的搜索网络时间，提高终端紧急呼叫时在CS域的搜索网络的效率。
可选地，在本申请的实施例中，例如，当终端未驻留在IMS LTE网络时且Wifi无线网络信号质量较好时发起紧急呼叫，基于频段能量扫描的预设的紧急呼叫门限大于普通呼叫时频段能量的扫描门限，由此初步筛选出IMS LTE域的第一频段中的高质量的频点，并在筛选出的频点处进行物理小区的搜索。
通过提高紧急呼叫时第一频段扫描的门限，减少第一频段中进行小区搜索的频点数量，由此减少紧急呼叫时终端在IMS LTE域的搜索网络时间，提高终端紧急呼叫时在IMS LTE域的搜索网络的效率。
需要说明的是，在本申请的实施例中，预设的紧急呼叫门限大于移动通信网络的频段能量扫描的第一门限，其中预设的紧急呼叫门限可以用于包括但不限定为以下场景：
场景一：CS域紧急呼叫的门限可以为预设的紧急呼叫门限，IMS LTE域紧急呼叫的门限可以为普通呼叫时频段能量的扫描门限，即IMS LTE域紧急呼叫的门限可以为频段扫描的第一门限。
场景二：IMS LTE域紧急呼叫的门限可以为预设的紧急呼叫门限，CS域紧急呼叫的门限可以为普通呼叫时频段能量的扫描门限，即CS域紧急呼叫的门限可以为频段扫描的第一门限。
场景三：CS域紧急呼叫的门限、IMS LTE域紧急呼叫的门限可以均为预设的紧急呼叫门限。
在本申请的实施例中，通过预设的紧急呼叫门限，其中预设的紧急呼叫门限大于移动通信网络频段扫描的第一门限，缩短了紧急呼叫的搜索网络的时间，减少了用户发起紧急呼叫时的等待时间，提高了用户的体验感。
S204，终端判断当前第一频段内是否成功搜索到第一小区。若所述终端在第一频段内成功搜索到第一小区，则执行S205。
具体地，终端首先在第一频段内进行频点的筛选，当第一频段内的某个频点大于紧急呼叫搜索网络的门限时，终端在该频点再进行基于物理小区的搜索。
S205，当终端在第一频段内成功搜索到第一小区时，终端在所述第一小区发起紧急呼 叫。
需要说明的是，第一小区可以为CS域或者IMS LTE域中的任意一个小区，此处不做具体的限定。
可选地，在本申请的一个实施例中，终端在检测移动通信网络的第一频段之前，终端可以确定Wifi无线网络的信号质量大于预定门限，例如，Wifi无线网络的访问参数大于访问阈值。
可选地，在本申请的一个实施例中，当终端在第一频段内所有大于预设的紧急呼叫门限的频点处均未成功发起紧急呼叫时，所述终端继续在移动通信网络中检测第二频段。
若所述第二频段的能量大于预设的紧急呼叫门限，则所述终端在所述第二频段内进行小区搜索，其中，所述紧急呼叫门限大于移动通信网络频段扫描的第一门限；
终端在所述第二频段内成功搜索到第二小区时，通过所述第二小区发起紧急呼叫。
若在第二频段包括的所有大于预设的紧急呼叫门限的频点处均未成功发起紧急呼叫，则执行前述类似方法，终端检测移动通信网络中的第三频段，此处不作具体限定。
可选地，在本申请的一个实施例中，当终端可以优先在CS域发起紧急呼叫。若终端在CS域未成功发起紧急呼叫时，根据紧急呼叫的域选优先级，该终端在IMS LTE域发起紧急呼叫。
可选地，在本申请的一个实施例中，当终端可以优先在IMS LTE域发起紧急呼叫。若终端在IMS LTE域未成功发起紧急呼叫时，根据紧急呼叫的域选优先级，该终端在CS域发起紧急呼叫。
可选地，在本申请的一个实施例中，终端在移动通信网络的所有频段内未成功搜索到小区时，或者，终端在移动通信网络的所有频段内未成功发起紧急呼叫时，终端通过所述Wifi无线网络发起紧急呼叫。
应理解，终端在移动通信网络的所有频段内未成功搜索到小区包括但不限定以下场景：
场景一：终端在所述CS域的所有频段内均未成功搜索到小区，即终端在CS域的第一频段、第二频段等各个频段所包括的大于预设紧急呼叫门限的频点处均未成功的搜索到小区，接着在IMS LTE域的第一频段、第二频段等各个频段所包括的大于预设紧急呼叫门限的频点处均未成功的搜索到小区，从而在移动通信网络未成功发起紧急呼叫。
场景二：终端在所述IMS LTE域的所有频段内均未成功搜索到小区，即终端在IMS LTE域的第一频段、第二频段等各个频段所包括的大于预设紧急呼叫门限的频点处均未成功的搜索到小区，接着在CS域的第一频段、第二频段等各个频段所包括的大于预设紧急呼叫门限的频点处均未成功的搜索到小区，从而在移动通信网络未成功发起紧急呼叫。
应理解，终端在移动通信网络的所有频段内未成功发起紧急呼叫包括但不限定为以下场景：
场景一：终端在所述CS域的某些频段中的大于预设紧急呼叫门限频点处，可以成功的搜索到小区，但是在该频点处未成功发起紧急呼叫。该终端可以继续在CS域中检测其它频段，直到终端在CS域中能搜索到的所有频段上均未成功的发起紧急呼叫。
终端接着在IMS LTE域的某些频段中的大于预设紧急呼叫门限频点处，成功搜索到小区，但是在该频点处未成功发起紧急呼叫。该终端可以继续在IMS LTE域中检测其它 频段，直到终端在IMS LTE域中能搜索到的所有频段上均未成功发起紧急呼叫。
因此，终端在移动通信网络的所有频段内未成功发起紧急呼叫。
场景二：终端在IMS LTE域的某些频段中的大于预设紧急呼叫门限频点处成功搜索到小区，但是在该频点处发起的紧急呼叫未成功。该终端可以继续在IMS LTE域中检测其它频段，直到终端在IMS LTE域中能搜索到的所有频段上均未成功的发起紧急呼叫。
终端接着在CS域的某些频段中的大于预设紧急呼叫门限频点处，可以成功的搜索到小区，但是在该频点处未成功发起紧急呼叫。该终端可以继续在CS域中检测其它频段，直到终端在CS域中能搜索到的所有频段上均未成功的发起紧急呼叫。
因此，终端在移动通信网络的所有频段内未成功发起紧急呼叫。
可选地，在本申请的一个实施例中，若终端通过所述Wifi无线网络成功发起紧急呼叫，则终端通过优先通过该Wifi无线网络发起下一次紧急呼叫。
需要说明的是，终端通过上述Wifi无线网络发起下一次紧急呼叫之前，终端确定该Wifi无线网络的信号质量大于预定门限。即当前用于通话业务的Wifi无线网络信号质量处于较好的情况下。
此外，从所述终端成功发起所述紧急呼叫时至所述终端发起所述下一次紧急呼叫时，所述终端与所述Wifi无线网络一直保持连接状态。
例如，终端若在第二次发起紧急呼叫之前，终端与该Wifi无线网络的连接中断过，则需要重新进行获取移动通信网络的第一频段，以及进行搜索网络。
在本申请的实施例中，通过优先选取上一次紧急呼叫成功且处于连接状态的信号质量较好的Wifi无线网络，缩短了紧急呼叫的搜索网络的时间，减少了用户发起紧急呼叫时的等待时间，提高了用户的体验感。
可选地，在本申请的一个实施例中，例如，终端在第一频段内成功搜索到第一小区时，通过所述第一小区发起紧急呼叫。当终端首次呼叫失败时，基于紧急呼叫重拨定时器，通过所述第一小区继续发起紧急呼叫，此时紧急呼叫重拨定时器的时长小于所述移动通信网络呼叫重拨定时器的时长。
具体地，通过所述第一小区发起的紧急呼叫失败，则所述紧急呼叫重拨定时器在超时前会进行紧急呼叫号码的重拨，再次发起紧急呼叫。
需要说明的是，终端内部配置有重拨定时器，重拨定时器中设置有重拨的时长。当拨号后首次发起呼叫失败，若没有超过设置的重拨时长时，重拨定时器会进行呼叫号码的重拨。
例如，预配置在CS域重拨定时器的重拨总时长为20秒，则在20秒内重拨定时器会在CS域再次发起紧急呼叫。超过20S后，若终端仍然紧急呼叫失败，则终端在CS域不再发起紧急呼叫重拨，即终端未成功发起紧急呼叫。接下来终端根据域选优先级，例如，终端在IMS LTE域开始网络搜索和注册。
在本申请的实施例中，通过设置紧急呼叫重拨定时器，其中紧急呼叫重拨定时器的时长小于移动通信网络呼叫重拨定时器的时长，即紧急呼叫时重拨定时器的时长小于正常呼叫重拨定时器的时长，从而缩短了紧急呼叫的重拨时间。
图3是根据本申请另一个实施例的紧急呼叫的方法的示意性流程图。图3所示的方法由终端执行，例如，可以由图1所示的终端执行。
需要说明的是，在图3中以CS域优先级高于IMS LTE域为例进行描述，图3中执行的流程也可以为IMS LTE域优先级高于CS域，此处不作具体地限定。
S301，终端获取紧急呼叫请求。
应理解，终端获取紧急呼叫请求终端可以为用户在终端通话界面上选择发起紧急呼叫的号码，也可以是，用户通过语音控制操作终端拨打紧急号码，本申请不作具体地限定。
S302，根据域选优先级，CS域优先级高于IMS LTE域，因此优先在CS域发起紧急呼叫。
S303，终端判断此时终端是否已经在CS域驻留。
若终端驻留在CS域，则执行S305。即终端满足CS域中的某一小区的接入条件，成功在某一个小区注册成功，则执行S305。若终端未驻留CS域，则执行S304。
S304，终端在CS域进行网络搜索和注册。其中，S304中包括以下步骤：
S3041，终端在CS域获取第一频段，并对第一频段的能量进行粗扫检测。
S3042，根据预设的紧急呼叫门限，检测出第一频段上大于预设紧急呼叫门限的频点，其中，预设的紧急呼叫门限高于普通呼叫的门限，即高于移动通信网络频段扫描的第一门限，执行S3403。
需要说明的是，在本申请的实施例中，第一门限可以为普通呼叫时的RSSI门限。本申请对此不作限定。
S3043，在大于预设紧急呼叫门限的频点处进行基于物理小区搜索的频点细扫。
S3044，判断在大于预设紧急呼叫门限的频点处进行的小区搜索和注册是否成功。若终端在该频点处小区搜索和注册成功，则执行S305。若终端在该频点处小区搜索和注册未成功，则执行S3041。
S305，终端在CS域发起紧急呼叫。
可选地，终端在CS域发起紧急呼叫之前所述终端已驻留在CS域。
可选地，终端在CS域发起紧急呼叫之前，终端在第一频段大于预设紧急呼叫的频点处小区搜索和注册成功。
S306，终端判断CS域紧急呼叫是否成功。
若终端成功发起紧急呼叫，则执行S307。若终端在CS域未成功发起紧急呼叫，则返回继续执行S304。
应理解，此处若终端在CS域未成功紧急呼叫，则终端继续在CS域中检测第二频段执行上述S3044、S3044、S3044以及S3044。若终端在第二频段依然未成功发起紧急呼叫，则终端执行上述类似流程，终端检测CS域中的第三频段，在本申请的实施例中不做具体限定。
S307，通过CS域成功发起紧急呼叫，即紧急呼叫流程结束。
当所述终端在CS域搜索网络和注册结束后，则执行S308。
S308，终端判断CS域紧急呼叫是否成功。
若CS域紧急呼叫未成功，则执行S309。
需要说明的是，终端在CS域的紧急呼叫未成功包括但不限定以下两种方式：
方式一：终端在CS域的所有频段，例如，第一频段、第二频段等等，均未成功搜索或者成功注册到小区。
方式二：终端在CS域的所有频段，例如，例如，第一频段、第二频段等等，均未成功发起紧急呼叫。
在执行309之前，根据紧急呼叫的域选优先级顺序，该紧急呼叫流程还包括以下步骤：
根据紧急呼叫的域选优先级，当终端在CS域未成功发起紧急呼叫时，接着该终端在IMS LTE域上发起紧急呼叫。
需要说明的是，终端在IMS LTE域发起紧急呼叫的流程与在CS域发起紧急呼叫流程类似，即执行S303终端判断是否已经驻留在IMS LTE域。
若终端已经驻留在IMS LTE域，则执行S305，在IMS LTE域上发起紧急呼叫。若未驻留在IMS LTE域，则执行S304进行IMS LTE域搜索网络和注册。其中，S304中包括以下步骤：
S3041，终端在IMS LTE域获取第一频段，并对第一频段的能量进行粗扫检测。
S3042，根据预设的紧急呼叫门限，检测出第一频段上大于预设紧急呼叫门限的频点，执行S3043。
S3043，将大于预设紧急呼叫门限的频点进行基于物理小区搜索的频点细扫。
S3044，判断在大于预设紧急呼叫门限的频点处小区搜索和注册是否成功。若小区搜索和注册成功，则执行S305。若小区搜索和注册未成功，则执行S3041。
S305，终端在IMS LTE域发起紧急呼叫。
可选地，终端在IMS LTE域发起紧急呼叫之前所述终端已驻留在IMS LTE域或者所述终端在第一频段大于预设紧急呼叫的频点处小区搜索和注册成功。
S306，终端判断IMS LTE域紧急呼叫是否成功。若终端成功紧急呼叫，则执行S307。若终端在IMS LTE域未成功紧急呼叫，则返回继续执行S304。
应理解，此处若终端在IMS LTE域未成功紧急呼叫，则终端继续在IMS LTE域中检测第二频段执行上述S3044、S3044、S3044以及S3044。若终端在第二频段依然未成功发起紧急呼叫，则终端执行上述类似流程，终端检测IMS LTE域中的第三频段，在本申请的实施例中不做具体限定。
S307，通过IMS LTE域成功发起紧急呼叫，即紧急呼叫流程结束。
当所述终端在IMS LTE域搜索网络和注册结束后，则执行S308。
S308，终端判断IMS LTE域紧急呼叫是否成功。若IMS LTE域紧急呼叫未成功，则执行S309。
需要说明的是，终端在IMS LTE域的紧急呼叫未成功包括但不限定以下两种方式：
方式一：终端在IMS LTE域的所有频段，例如，第一频段、第二频段等等，均未成功搜索或者成功注册到小区。
方式二：终端在IMS LTE域的所有频段，例如，例如，第一频段、第二频段等等，均未成功发起紧急呼叫。
S309，基于Wifi无线网络发起紧急呼叫语音通话业务，即VoWifi。
需要说明的是，用于语音通话业务的Wifi无线网络与普通的Wifi无线网络存在一定的差别。用于语音通话业务的Wifi无线网络需要将普通Wifi无线网络经过专有服务器进行身份验证、鉴权以及加密保护等操作后将该Wifi无线网络发送至核心。
S310，终端判断基于Wifi无线网络发起紧急呼叫语音业务是否成功。若终端基于Wifi 无线网络成功发起紧急呼叫语音业务，则执行S311。若终端基于Wifi无线网络未成功发起紧急呼叫语音业务，则执行S312。
S311，基于Wifi无线网络成功发起紧急呼叫语音业务，即紧急呼叫流程结束。
S312，CS域基于第一门限搜网(此处的第一门限即为普通呼叫时的门限，例如，第一门限可以为普通呼叫时的RSSI门限)的网络搜索和注册，其中，S312中包括以下步骤：
S3121，终端在CS域获取第一频段，并对第一频段的能量进行粗扫检测。
S3122，根据第一门限，检测出第一频段上大于预设紧急呼叫门限的频点，执行S3123。
S3123，将大于第一门限的频点进行基于物理小区搜索的频点细扫。
S3124，判断在大于第一门限的频点处小区搜索和注册是否成功。若小区搜索和注册成功，则执行S305。若小区搜索和注册未成功，则执行S3121。
需要说明的是，S3042中的门限为预设的紧急呼叫门限，可以理解为紧急呼叫的专有门限，其门限高于S3123中的第一门限。第一门限可以理解为普通呼叫时的门限，例如，第一门限可以为普通呼叫时的RSSI门限。预设的紧急呼叫门限高于普通呼叫的第一门限，即可以初步筛选出高质量信号的频点，减少搜索网络的频段频点数量，从而缩短紧急呼叫的搜索网络的时间。
可选地，在本申请的一个实施例中，S302可以为IMS LTE域的优先级高于CS域。即上述流程首先在IMS LTE域中执行。
可选地，在本申请的一个实施例中，CS域搜索网络和注册时可以采用预设的紧急呼叫门限，IMS LTE域搜索网络和注册时也可以采用预设的紧急呼叫门限。
可选地，在本申请的一个实施例中，CS域搜索网络和注册时可以采用预设的紧急呼叫门限，IMS LTE域搜索网络和注册时可以采用普通呼叫的第一门限。
可选地，在本申请的一个实施例中，CS域搜索网络和注册时可以采用普通呼叫的第一门限，IMS LTE域搜索网络和注册时可以采用预设的紧急呼叫门限。
应理解，在Wifi无线网络信号质量大于预定门限，即Wifi无线网络信号质量较好时。该Wifi无线网络可以用于语音通话业务，需要将普通Wifi无线网络经过专有服务器进行身份验证、鉴权以及加密保护等操作后将该Wifi无线网络发送至核心。此时，采用预设的紧急呼叫门限进行网络搜索和注册，能够初步筛选出高质量信号的频点，减少移动通信网络搜索网络的频段频点数量，若移动通信网络未成功发起紧急呼叫，可以快速的通过Wifi无线网络发起紧急呼叫语音通话业务。从而减少用户紧急呼叫时的等待时间，提供用户的体验。
图4是根据本申请另一个实施例的紧急呼叫的方法的示意性流程图。图4所示的方法由终端执行，例如，可以由图1所示的终端执行。
需要说明的是，图4中的S402所示为CS域发起紧急呼叫，也可以用于IMS LTE域发起紧急呼叫，同时也可以为图3中的S305。
S401，终端判断是否小区搜索和注册成功。若终端此时已经小区搜索和注册成功，则执行S402。
S402，终端在CS域发起紧急呼叫。其中，S402包括以下步骤：
S4021，终端判断是否首次呼叫失败。若首次呼叫失败，则执行S4022。
应理解，终端首次呼叫失败并不意味着终端未成功发起紧急呼叫，终端界面上显示的 成功发起紧急呼叫，可以为基于终端内部配置的重拨定时器发起了几次紧急呼叫后，最终成功发起紧急呼叫。
S4022，终端在搜索和注册成功的小区，例如终端成功搜索到第一小区时，基于紧急呼叫重拨定时器，通过所述第一小区发起紧急呼叫，其中，所述紧急呼叫重拨定时器的时长小于所述移动通信网络呼叫重拨定时器的时长。
在本申请的实施例中，例如，移动通信网络呼叫重拨定时器的时长为10秒，即若终端在10秒内发起呼叫失败，重拨定时器会自动重拨号码再次发起呼叫。若超过10秒时，则重拨定时器将停止在移动通信网络中再次发起呼叫。而紧急呼叫重拨定时器的时长可以设置为5秒，若终端在5秒内紧急呼叫失败，紧急呼叫重拨定时器会自动重拨号码再次发起呼叫。若超过5秒时，则紧急呼叫重拨定时器将停止在移动通信网络中再次发起紧急呼叫。因此，减少了紧急呼叫的等待时间，提高了用户的体验感。
需要说明的是，重拨定时器的重拨时长可以为提前在终端内部预设好的，例如，重拨时长设置为30秒。重拨次数是由终端所处的网络环境以及接收到的信令等因素所决定的。
例如，若终端所处的网络一直没有响应，则终端发起呼叫的时间间隔可以缩短，即终端发起的重拨次数增加。
S4023，终端进行紧急呼叫重拨。
具体地，可以为当紧急呼叫重拨定时器超时前进行紧急呼叫重拨。例如，在紧急呼叫重拨定时器超过设置的重拨时长前，紧急呼叫重拨定时器会自动重拨号码，再次发起紧急呼叫。
图5是根据本申请另一个实施例的紧急呼叫的方法的示意性流程图。图5所示的方法由终端执行，例如，可以由图1所示的终端执行。
S501，用户UE在终端上拨打紧急号码。
应理解，终端拨打紧急号码可以为用户在终端通话界面上选择发起紧急呼叫的号码，也可以是，用户通过语音控制操作终端拨打紧急号码，本申请不作具体地限定。
S502，终端判断当前连接的Wifi无线网络与上次成功发起紧急呼叫语音业务的Wifi无线网络是否为同一次注册的Wifi无线网络。
若当前连接的Wifi无线网络与上次成功发起紧急呼叫语音业务的Wifi无线网络为同一次注册的Wifi无线网络，则执行S503。
若当前连接的Wifi无线网络与上次成功发起紧急呼叫语音业务的Wifi无线网络不是同一次注册的Wifi无线网络，则执行S504。
S503，终端判断上述同一次注册Wifi无线网络是否可用于紧急呼叫语音业务。
若该Wifi无线网络可以用于紧急呼叫语音业务，则执行S505。若该Wifi无线网络不可以用于紧急呼叫语音业务，则执行S504。
S504，原紧急呼叫流程可以为图3所描述的采用预设紧急呼叫门限的紧急呼叫流程，或者，也可以为类似于图3但是采用普通呼叫门限的紧急呼叫流程，此处本申请不作具体的限定。
S505，终端直接从该同一次注册且上次成功发起过紧急呼叫语音业务的Wifi无线网络发起第二紧急呼叫语音业务。
S506，终端判断本次紧急呼叫语音业务是否成功。
若成功，则执行S507。若不成功，则执行S504。
S507，终端基于Wifi无线网络成功发起紧急呼叫语音业务，即紧急呼叫流程结束。
可选地，在本申请的一个实施例中，终端确定Wifi无线网络的信号质量大于预定门限，即Wifi无线网络的信号质量较好的情况下。终端确定通过Wifi无线网络成功发起过第一紧急呼叫，从终端成功发起第一紧急呼叫时至终端发起所述第二紧急呼叫时，终端与该Wifi无线网络一直保持连接状态，则终端可以通过该Wifi无线网络发起第二紧急呼叫。
需要说明的是，该Wifi无线网络可以用于语音通话业务，需要将普通Wifi无线网络经过专有服务器进行身份验证、鉴权以及加密保护等操作后将该Wifi无线网络发送至核心。
在本申请的实施例中，通过一直与终端保持连接状态且上次成功发起紧急呼叫语音业务的Wifi无线网络为同一次注册的Wifi无线网络发起本次紧急呼叫，从而减少了紧急呼叫的搜索网络的时间，提供用户的体验感。
应理解，本申请实施例的各种实施方式既可以单独实施，也可以结合实施，本申请实施例对此并不限定。
应理解，本申请实施例中的具体的例子只是为了帮助本领域技术人员更好地理解本申请实施例，而非限制本申请实施例的范围。
应理解，在本申请的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
上文详细描述了通过采用预设紧急呼叫门限、紧急呼叫重拨定时器以及同一次注册且成功发起过紧急呼叫的Wifi无线网络等，进行紧急呼叫的方法。下面将描述根据本申请实施例的终端。应理解，本申请实施例的终端可以执行前述本申请实施例的各种方法，即以下各种产品的具体工作过程，可以参考前述方法实施例中的对应过程。
图6是根据本申请一个实施例的终端的示意性框图。如图6所示，终端600包括：处理单元610和通信单元620。
处理单元610和通信单元620之间通过内部连接通路互相通信，传递控制和/或数据信号。在一个可能的设计中，处理单元610和通信单元620可以通过芯片实现，以实现在本申请实施例中终端的相应功能。
在本申请的一个实施例中，所述处理单元610用于：
用于获取紧急呼叫请求。
所述处理单元610还用于，
检测移动通信网络的第一频段。
若所述第一频段的能量大于预设的紧急呼叫门限，则所述处理单元610还用于在所述第一频段内进行小区搜索，其中，所述紧急呼叫门限大于移动通信网络频段扫描的第一门限。
通信单元620用于：
在所述第一频段内成功搜索到第一小区时，通过所述第一小区发起紧急呼叫。
可选地，在所述终端检测移动通信网络的第一频段之前，所述处理单元610还用于：
确定Wifi无线网络的信号质量大于预定门限。
可选地，所述第一门限用于非紧急呼叫时所述移动通信网络的频段扫描。
可选地，所述处理单元610还用于：
在所述第一频段内未成功搜索到小区时，或者，在所述第一频段内未成功发起紧急呼叫时，检测所述移动通信网络的第二频段。
可选地，所述通信单元620还用于：
在所述移动通信网络的所有频段内未成功搜索到小区时，或者，在所述移动通信网络的所有频段内未成功发起紧急呼叫时，通过所述Wifi无线网络发起紧急呼叫。
可选地，所述通信单元620还用于：
若所述终端通过所述Wifi无线网络成功发起紧急呼叫，通过所述Wifi无线网络发起下一次紧急呼叫。
可选地，所述终端通过所述Wifi无线网络发起下一次紧急呼叫之前，所述处理单元610还用于：
确定所述Wifi无线网络的信号质量大于预定门限。
可选地，从所述终端成功发起所述紧急呼叫时至所述终端发起所述下一次紧急呼叫时，所述终端与所述Wifi无线网络一直保持连接状态。
可选地，所述终端检测移动通信网络的第一频段之前，所述终端未驻留在所述移动通信网络。
可选地，所述终端检测移动通信网络的第一频段之前，所述终端驻留在所述移动通信网络的第二小区，且所述终端在所述第二小区未成功发起紧急呼叫。
可选地，所述通信单元620还用于：
基于紧急呼叫重拨定时器，通过所述第一小区发起紧急呼叫，其中，所述紧急呼叫重拨定时器的时长小于所述移动通信网络呼叫重拨定时器的时长。
可选地，处理单元610还用于：
若通过所述第一小区发起的紧急呼叫失败，则在所述紧急呼叫重拨定时器超时前进行紧急呼叫重拨。
在本申请的一个实施例中，处理单元610用于：
在移动通信网络进行小区搜索。
通信单元620用于：
在处理单元在所述移动通信网络成功搜索到第一小区时，基于紧急呼叫重拨定时器，通过所述第一小区发起紧急呼叫，其中，所述紧急呼叫重拨定时器的时长小于所述移动通信网络呼叫重拨定时器的时长。
可选地，所述处理单元610还用于：
若通过所述第一小区发起的紧急呼叫失败，则在所述紧急呼叫重拨定时器超时前进行紧急呼叫重拨。
在本申请的一个实施例中，处理单元610用于：
确定所述终端通过Wifi无线网络成功发起过第一紧急呼叫。
通信单元620用于：
从所述终端成功发起所述第一紧急呼叫时至所述终端发起第二紧急呼叫时，所述终端与所述Wifi无线网络一直保持连接状态，通过所述Wifi无线网络发起第二紧急呼叫。
可选地，所述处理单元610还用于：
确定所述Wifi无线网络的信号质量大于预定门限。
图7是根据本申请实施例的终端的另一示意性框图。图7所示的终端700包括：射频(Radio Frequency，RF)电路710、存储器720、其他输入设备730、显示屏740、传感器750、音频电路760、I/O子系统770、处理器780、以及电源790等部件。本领域技术人员可以理解，图7中示出的终端结构并不构成对终端的限定，可以包括比图示更多或更少的部件，或者组合某些部件，或者拆分某些部件，或者不同的部件布置。本领领域技术人员可以理解显示屏740属于用户界面(User Interface，UI)，且终端700可以包括比图示或者更少的用户界面。
下面结合图7对终端700的各个构成部件进行具体的介绍：
RF电路710可用于收发信息或通话过程中，信号的接收和发送，特别地，将基站的下行信息接收后，给处理器780处理；另外，将设计上行的数据发送给基站。通常，RF电路包括但不限于天线、至少一个放大器、收发信机、耦合器、低噪声放大器(Low Noise Amplifier，LNA)、双工器等。此外，RF电路710还可以通过无线通信与网络和其他设备通信。所述无线通信可以使用任一通信标准或协议，包括但不限于全球移动通讯系统(Global System of Mobile communication，GSM)、通用分组无线服务(General Packet Radio Service，GPRS)、码分多址(Code Division Multiple Access，CDMA)、宽带码分多址(Wideband Code Division Multiple Access,WCDMA)、长期演进(Long Term Evolution,LTE)、电子邮件、短消息服务(Short Messaging Service，SMS)等。
存储器720可用于存储软件程序以及模块，处理器780通过运行存储在存储器720的软件程序以及模块，从而执行终端700的各种功能应用以及数据处理。存储器720可主要包括存储程序区和存储数据区，其中，存储程序区可存储操作系统、至少一个功能所需的应用程序(比如声音播放功能、图像播放功能等)等；存储数据区可存储根据终端700的使用所创建的数据(比如音频数据、电话本等)等。此外，存储器720可以包括高速随机存取存储器，还可以包括非易失性存储器，例如至少一个磁盘存储器件、闪存器件、或其他易失性固态存储器件。
其他输入设备730可用于接收输入的数字或字符信息，以及产生与终端700的用户设置以及功能控制有关的键信号输入。具体地，其他输入设备730可包括但不限于物理键盘、功能键(比如音量控制按键、开关按键等)、轨迹球、鼠标、操作杆、光鼠(光鼠是不显示可视输出的触摸敏感表面，或者是由触摸屏形成的触摸敏感表面的延伸)等中的一种或多种。其他输入设备730与I/O子系统770的其他输入设备控制器771相连接，在其他设备输入控制器771的控制下与处理器780进行信号交互。
显示屏740可用于显示由用户输入的信息或提供给用户的信息以及终端700的各种菜单，还可以接受用户输入。具体的显示屏740可包括显示面板741，以及触控面板742。其中显示面板741可以采用液晶显示器(Liquid Crystal Display，LCD)、有机发光二极管(Organic Light-Emitting Diode,OLED)等形式来配置显示面板741。触控面板742，也称为触摸屏、触敏屏等，可收集用户在其上或附近的接触或者非接触操作(比如用户使用手指、触笔等任何适合的物体或附件在触控面板742上或在触控面板742附近的操作，也可以包括体感操作；该操作包括单点控制操作、多点控制操作等操作类型)，并根据预先设定的 程式驱动相应的连接装置。可选的，触控面板742可包括触摸检测装置和触摸控制器两个部分。其中，触摸检测装置检测用户的触摸方位、姿势，并检测触摸操作带来的信号，将信号传送给触摸控制器；触摸控制器从触摸检测装置上接收触摸信息，并将它转换成处理器能够处理的信息，再送给处理器780，并能接收处理器780发来的命令并加以执行。此外，可以采用电阻式、电容式、红外线以及表面声波等多种类型实现触控面板742，也可以采用未来发展的任何技术实现触控面板742。进一步的，触控面板742可覆盖显示面板741，用户可以根据显示面板741显示的内容(该显示内容包括但不限于，软键盘、虚拟鼠标、虚拟按键、图标等等)，在显示面板741上覆盖的触控面板742上或者附近进行操作，触控面板742检测到在其上或附近的操作后，通过I/O子系统770传送给处理器780以确定用户输入，随后处理器780根据用户输入通过I/O子系统770在显示面板741上提供相应的视觉输出。虽然在图7中，触控面板742与显示面板741是作为两个独立的部件来实现终端700的输入和输入功能，但是在某些实施例中，可以将触控面板742与显示面板741集成而实现终端700的输入和输出功能。
终端700还可包括至少一种传感器750，比如光传感器、运动传感器以及其他传感器。具体地，光传感器可包括环境光传感器及接近传感器，其中，环境光传感器可根据环境光线的明暗来调节显示面板741的亮度，接近传感器可在终端700移动到耳边时，关闭显示面板741和/或背光。作为运动传感器的一种，加速计传感器可检测各个方向上(一般为三轴)加速度的大小，静止时可检测出重力的大小及方向，可用于识别手机姿态的应用(比如横竖屏切换、相关游戏、磁力计姿态校准)、振动识别相关功能(比如计步器、敲击)等；至于终端700还可配置的陀螺仪、气压计、湿度计、温度计、红外线传感器等其他传感器，在此不再赘述。
音频电路760、扬声器761，麦克风762可提供用户与终端700之间的音频接口。音频电路760可将接收到的音频数据转换后的信号，传输到扬声器761，由扬声器761转换为声音信号输出；另一方面，麦克风762将收集的声音信号转换为信号，由音频电路760接收后转换为音频数据，再将音频数据输出至RF电路710以发送给比如另一手机，或者将音频数据输出至存储器720以便进一步处理。
I/O子系统770用来控制输入输出的外部设备，可以包括其他设备输入控制器771、传感器控制器772、显示控制器773。可选的，一个或多个其他输入控制设备控制器771从其他输入设备730接收信号和/或者向其他输入设备730发送信号，其他输入设备730可以包括物理按钮(按压按钮、摇臂按钮等)、拨号盘、滑动开关、操纵杆、点击滚轮、光鼠(光鼠是不显示可视输出的触摸敏感表面，或者是由触摸屏形成的触摸敏感表面的延伸)。值得说明的是，其他输入控制设备控制器771可以与任一个或者多个上述设备连接。所述I/O子系统770中的显示控制器773从显示屏740接收信号和/或者向显示屏740发送信号。显示屏740检测到用户输入后，显示控制器773将检测到的用户输入转换为与显示在显示屏740上的用户界面对象的交互，即实现人机交互。传感器控制器772可以从一个或者多个传感器750接收信号和/或者向一个或者多个传感器750发送信号。
处理器780是终端700的控制中心，利用各种接口和线路连接整个终端的各个部分，通过运行或执行存储在存储器720内的软件程序和/或模块，以及调用存储在存储器720内的数据，执行终端700的各种功能和处理数据，从而对终端进行整体监控。可选的，处 理器780可包括一个或多个处理单元；可选地，处理器780可集成应用处理器和调制解调处理器，其中，应用处理器主要处理操作系统、用户界面和应用程序等，调制解调处理器主要处理无线通信。可以理解的是，上述调制解调处理器也可以不集成到处理器780中。
在本申请的一个实施例中，处理器780用于：用于获取紧急呼叫请求，检测移动通信网络的第一频段；若所述第一频段的能量大于预设的紧急呼叫门限，则所述处理器在所述第一频段内进行小区搜索，其中，所述紧急呼叫门限大于移动通信网络频段扫描的第一门限。在所述第一频段内成功搜索到第一小区时，通过所述第一小区发起紧急呼叫。
应理解，在本申请实施例中，处理器780能够执行图6中处理单元610和通信单元620的功能。
可选地，在所述终端检测移动通信网络的第一频段之前，处理器780还用于：
确定Wifi无线网络的信号质量大于预定门限。
可选地，所述第一门限用于非紧急呼叫时所述移动通信网络的频段扫描。
可选地，处理器780还用于：
在所述第一频段内未成功搜索到小区时，或者，在所述第一频段内未成功发起紧急呼叫时，所述终端检测所述移动通信网络的第二频段。
可选地，处理器780还用于：
在所述移动通信网络的所有频段内未成功搜索到小区时，或者，在所述移动通信网络的所有频段内未成功发起紧急呼叫时，所述处理器通过所述Wifi无线网络发起紧急呼叫。
可选地，处理器780还用于：
若所述处理器通过所述Wifi无线网络成功发起紧急呼叫，则所述处理器通过所述Wifi无线网络发起下一次紧急呼叫。
可选地，所述终端通过所述Wifi无线网络发起下一次紧急呼叫之前，处理器780还用于：
确定所述Wifi无线网络的信号质量大于预定门限。
可选地，从所述终端成功发起所述紧急呼叫时至所述终端发起所述下一次紧急呼叫时，所述终端与所述Wifi无线网络一直保持连接状态。
可选地，所述终端检测移动通信网络的第一频段之前，所述终端未驻留在所述移动通信网络。
可选地，所述终端检测移动通信网络的第一频段之前，所述终端驻留在所述移动通信网络的第二小区，且所述终端在所述第二小区未成功发起紧急呼叫。
可选地，处理器780还用于：
基于紧急呼叫重拨定时器，通过所述第一小区发起紧急呼叫，其中，所述紧急呼叫重拨定时器的时长小于所述移动通信网络呼叫重拨定时器的时长。
可选地，处理器780还用于：
若通过所述第一小区发起的紧急呼叫失败，则在所述紧急呼叫重拨定时器超时前进行紧急呼叫重拨。
在本申请的一个实施例中，处理器780用于：
在移动通信网络进行小区搜索。
所述终端在所述移动通信网络成功搜索到第一小区时，所述处理器780用于基于紧急 呼叫重拨定时器，通过所述第一小区发起紧急呼叫，其中，所述紧急呼叫重拨定时器的时长小于所述移动通信网络呼叫重拨定时器的时长。
可选地，述基于紧急呼叫重拨定时器，通过所述第一小区发起紧急呼叫，包括：
若通过所述第一小区发起的紧急呼叫失败，则在所述紧急呼叫重拨定时器超时前进行紧急呼叫重拨。
在本申请的一个实施例中，处理器780用于：
确定通过Wifi无线网络成功发起过第一紧急呼叫；
从所述终端成功发起所述第一紧急呼叫时至所述终端发起第二紧急呼叫时，所述终端与所述Wifi无线网络一直保持连接状态，通过所述Wifi无线网络发起第二紧急呼叫。
可选地，处理器780还用于：
确定所述Wifi无线网络的信号质量大于预定门限。
终端700还包括给各个部件供电的电源790(比如电池)，可选的，电源可以通过电源管理系统与处理器780逻辑相连，从而通过电源管理系统实现管理充电、放电、以及功耗等功能。
尽管未示出，终端700还可以包括摄像头、蓝牙模块等，在此不再赘述。
应理解，该终端700可对应于根据本申请实施例的紧急呼叫方法中的终端，该终端700可以包括用于执行上述方法中的终端或电子设备执行的方法的实体单元。并且，该终端700中的各实体单元和上述其他操作和/或功能分别为了上述方法的相应流程，为了简洁，在此不再赘述。
还应理解，该终端700可以包括用于执行上述紧急呼叫的方法中的实体单元。并且，该终端700中的各实体单元和上述其他操作和/或功能分别为了上述方法的相应流程，为了简洁，在此不再赘述。
本申请实施例还提出了一种计算机可读存储介质，该计算机可读存储介质存储一个或多个程序，该一个或多个程序包括指令，该指令当被包括多个应用程序的便携式电子设备执行时，能够使该便携式电子设备执行图2、图3、图4以及图5中的部分或全部的所示实施例的方法。
当所述指令被所述终端执行时，使得所述终端执行以下步骤：
在本申请的一个实施例中，终端获取紧急呼叫请求；
所述终端检测移动通信网络的第一频段；
若所述第一频段的能量大于预设的紧急呼叫门限，则所述终端在所述第一频段内进行小区搜索，其中，所述紧急呼叫门限大于移动通信网络频段扫描的第一门限；
所述终端在所述第一频段内成功搜索到第一小区时，通过所述第一小区发起紧急呼叫。
可选地，在所述终端检测移动通信网络的第一频段之前，所述指令还包括：所述终端确定Wifi无线网络的信号质量大于预定门限。
可选地，所述第一门限用于非紧急呼叫时所述移动通信网络的频段扫描。
可选地，所述指令还包括：
所述终端在所述第一频段内未成功搜索到小区时，或者，所述终端在所述第一频段内未成功发起紧急呼叫时，所述终端检测所述移动通信网络的第二频段。
可选地，所述指令还包括：
所述终端在所述移动通信网络的所有频段内未成功搜索到小区时，或者，所述终端在所述移动通信网络的所有频段内未成功发起紧急呼叫时，所述终端通过所述Wifi无线网络发起紧急呼叫。
可选地，所述指令还包括：
若所述终端通过所述Wifi无线网络成功发起紧急呼叫，则所述终端通过所述Wifi无线网络发起下一次紧急呼叫。
可选地，所述终端通过所述Wifi无线网络发起下一次紧急呼叫之前，所述指令还包括：
所述终端确定所述Wifi无线网络的信号质量大于预定门限。
可选地，从所述终端成功发起所述紧急呼叫时至所述终端发起所述下一次紧急呼叫时，所述终端与所述Wifi无线网络一直保持连接状态。
可选地，所述终端检测移动通信网络的第一频段之前，所述终端未驻留在所述移动通信网络。
可选地，所述终端检测移动通信网络的第一频段之前，所述终端驻留在所述移动通信网络的第二小区，且所述终端在所述第二小区未成功发起紧急呼叫。
可选地，所述通过所述第一小区发起紧急呼叫，包括：
所述终端基于紧急呼叫重拨定时器，通过所述第一小区发起紧急呼叫，其中，所述紧急呼叫重拨定时器的时长小于所述移动通信网络呼叫重拨定时器的时长。
可选地，所述基于紧急呼叫重拨定时器，通过所述第一小区发起紧急呼叫，包括：
若通过所述第一小区发起的紧急呼叫失败，则在所述紧急呼叫重拨定时器超时前进行紧急呼叫重拨。
在本申请的一个实施例中，当所述指令被所述终端执行时，使得所述终端执行以下步骤：
终端在移动通信网络进行小区搜索；
所述终端在所述移动通信网络成功搜索到第一小区时，基于紧急呼叫重拨定时器，通过所述第一小区发起紧急呼叫，其中，所述紧急呼叫重拨定时器的时长小于所述移动通信网络呼叫重拨定时器的时长。
可选地，所述基于紧急呼叫重拨定时器，通过所述第一小区发起紧急呼叫，包括：
若通过所述第一小区发起的紧急呼叫失败，则在所述紧急呼叫重拨定时器超时前进行紧急呼叫重拨。
在本申请的一个实施例中，当所述指令被所述终端执行时，使得所述终端执行以下步骤：
终端确定通过Wifi无线网络成功发起过第一紧急呼叫；
从所述终端成功发起所述第一紧急呼叫时至所述终端发起第二紧急呼叫时，所述终端与所述Wifi无线网络一直保持连接状态，所述终端通过所述Wifi无线网络发起第二紧急呼叫。
可选地，所述指令还包括：
所述终端确定所述Wifi无线网络的信号质量大于预定门限。
还应理解，本申请实施例中的图7中的处理器可以是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法实施例的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器可以是中央处理单元(Central Processing Unit，CPU)、该处理器还可以是其他通用处理器、数字信号处理器(Digital Signal Processor，DSP)、专用集成电路(Application Specific Integrated Circuit，ASIC)、现场可编程门阵列(Field Programmable Gate Array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件器组合执行完成。软件器可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器读取存储器中的信息，结合其硬件完成上述方法的步骤。
还应理解，本申请实施例中的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(Read-Only Memory，ROM)、可编程只读存储器(Programmable ROM，PROM)、可擦除可编程只读存储器(Erasable PROM，EPROM)、电可擦除可编程只读存储器(Electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(Random Access Memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(Static RAM，SRAM)、动态随机存取存储器(Dynamic RAM，DRAM)、同步动态随机存取存储器(Synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(Double Data Rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(Enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(Synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(Direct Rambus RAM，DR RAM)。应注意，本文描述的系统和方法的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
还应理解，该总线系统除包括数据总线之外，还可以包括电源总线、控制总线和状态信号总线等。但是为了清楚说明起见，在图中将各种总线都标为总线系统。
还应理解，在本申请实施例中，“与A相应的B”表示B与A相关联，根据A可以确定B。但还应理解，根据A确定B并不意味着仅仅根据A确定B，还可以根据A和/或其它信息确定B。应理解，本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存10在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
在实现过程中，上述方法的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。结合本申请实施例所公开的用于传输上行信号的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件器组合执行完成。软件器可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器读取存储器中的信息，结合其硬件完成上述方法的步骤。为避免重复，这里不再详细描述。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以 硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (48)

  1. 一种紧急呼叫的方法，其特征在于，包括：
    终端获取紧急呼叫请求；
    所述终端检测移动通信网络的第一频段；
    若所述第一频段的能量大于预设的紧急呼叫门限，则所述终端在所述第一频段内进行小区搜索，其中，所述紧急呼叫门限大于移动通信网络频段扫描的第一门限；
    所述终端在所述第一频段内成功搜索到第一小区时，通过所述第一小区发起紧急呼叫。
  2. 根据权利要求1所述的方法，其特征在于，在所述终端检测移动通信网络的第一频段之前，所述方法还包括：
    所述终端确定Wifi无线网络的信号质量大于预定门限。
  3. 根据权利要求1所述的方法，其特征在于，所述第一门限用于非紧急呼叫时所述移动通信网络的频段扫描。
  4. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    所述终端在所述第一频段内未成功搜索到小区时，或者，所述终端在所述第一频段内未成功发起紧急呼叫时，所述终端检测所述移动通信网络的第二频段。
  5. 根据权利要求1至4中任一项所述的方法，其特征在于，所述方法还包括：
    所述终端在所述移动通信网络的所有频段内未成功搜索到小区时，或者，所述终端在所述移动通信网络的所有频段内未成功发起紧急呼叫时，所述终端通过所述Wifi无线网络发起紧急呼叫。
  6. 根据权利要求5所述的方法，其特征在于，所述方法还包括：
    若所述终端通过所述Wifi无线网络成功发起紧急呼叫，则所述终端通过所述Wifi无线网络发起下一次紧急呼叫。
  7. 根据权利要求6所述的方法，其特征在于，所述终端通过所述Wifi无线网络发起下一次紧急呼叫之前，所述方法还包括：
    所述终端确定所述Wifi无线网络的信号质量大于预定门限。
  8. 根据权利要求6或7所述的方法，其特征在于，从所述终端成功发起所述紧急呼叫时至所述终端发起所述下一次紧急呼叫时，所述终端与所述Wifi无线网络一直保持连接状态。
  9. 根据权利要求1至8中任一项所述的方法，其特征在于，所述终端检测移动通信网络的第一频段之前，所述终端未驻留在所述移动通信网络。
  10. 根据权利要求1至8中任一项所述的方法，其特征在于，所述终端检测移动通信网络的第一频段之前，所述终端驻留在所述移动通信网络的第二小区，且所述终端在所述第二小区未成功发起紧急呼叫。
  11. 根据权利要求1至10中任一项所述的方法，其特征在于，所述通过所述第一小区发起紧急呼叫，包括：
    所述终端基于紧急呼叫重拨定时器，通过所述第一小区发起紧急呼叫，其中，所述紧 急呼叫重拨定时器的时长小于所述移动通信网络呼叫重拨定时器的时长。
  12. 根据权利要求1至11中任一项所述的方法，其特征在于，所述基于紧急呼叫重拨定时器，通过所述第一小区发起紧急呼叫，包括：
    若通过所述第一小区发起的紧急呼叫失败，则在所述紧急呼叫重拨定时器超时前进行紧急呼叫重拨。
  13. 一种紧急呼叫的方法，其特征在于，包括：
    终端在移动通信网络进行小区搜索；
    所述终端在所述移动通信网络成功搜索到第一小区时，基于紧急呼叫重拨定时器，通过所述第一小区发起紧急呼叫，其中，所述紧急呼叫重拨定时器的时长小于所述移动通信网络呼叫重拨定时器的时长。
  14. 根据权利要求13所述的方法，其特征在于，所述基于紧急呼叫重拨定时器，通过所述第一小区发起紧急呼叫，包括：
    若通过所述第一小区发起的紧急呼叫失败，则在所述紧急呼叫重拨定时器超时前进行紧急呼叫重拨。
  15. 一种紧急呼叫的方法，其特征在于，包括：
    终端确定通过Wifi无线网络成功发起过第一紧急呼叫；
    从所述终端成功发起所述第一紧急呼叫时至所述终端发起第二紧急呼叫时，所述终端与所述Wifi无线网络一直保持连接状态，所述终端通过所述Wifi无线网络发起第二紧急呼叫。
  16. 根据权利要求15所述的方法，其特征在于，所述方法还包括：
    所述终端确定所述Wifi无线网络的信号质量大于预定门限。
  17. 一种终端，包括：
    射频电路；
    一个或多个处理器；
    存储器；
    多个应用程序；
    以及一个或多个计算机程序，其中所述一个或多个计算机程序被存储在所述存储器中，所述一个或多个计算机程序包括指令，当所述指令被所述终端执行时，使得所述终端执行以下步骤：
    获取紧急呼叫请求；
    检测移动通信网络的第一频段；
    若所述第一频段的能量大于预设的紧急呼叫门限，则在所述第一频段内进行小区搜索，其中，所述紧急呼叫门限大于移动通信网络频段扫描的第一门限；
    在所述第一频段内成功搜索到第一小区时，通过所述第一小区发起紧急呼叫。
  18. 根据权利要求17所述的终端，其特征在于，在所述终端检测移动通信网络的第一频段之前，所述指令还包括：
    确定Wifi无线网络的信号质量大于预定门限。
  19. 根据权利要求17所述的终端，其特征在于，所述第一门限用于非紧急呼叫时所述移动通信网络的频段扫描。
  20. 根据权利要求17所述的终端，其特征在于，所述指令还包括：
    在所述第一频段内未成功搜索到小区时，或者，在所述第一频段内未成功发起紧急呼叫时，检测所述移动通信网络的第二频段。
  21. 根据权利要求17至20中任一项所述的终端，其特征在于，所述指令还包括：
    在所述移动通信网络的所有频段内未成功搜索到小区时，或者，在所述移动通信网络的所有频段内未成功发起紧急呼叫时，通过所述Wifi无线网络发起紧急呼叫。
  22. 根据权利要求21所述的终端，其特征在于，所述指令还包括：
    若通过所述Wifi无线网络成功发起紧急呼叫，则通过所述Wifi无线网络发起下一次紧急呼叫。
  23. 根据权利要求22所述的终端，其特征在于，所述终端通过所述Wifi无线网络发起下一次紧急呼叫之前，所述指令还包括：
    确定所述Wifi无线网络的信号质量大于预定门限。
  24. 根据权利要求22或23所述的终端，其特征在于，从所述终端成功发起所述紧急呼叫时至所述终端发起所述下一次紧急呼叫时，所述终端与所述Wifi无线网络一直保持连接状态。
  25. 根据权利要求17至24中任一项所述的终端，其特征在于，所述检测移动通信网络的第一频段之前，所述终端未驻留在所述移动通信网络。
  26. 根据权利要求17至24中任一项所述的终端，其特征在于，所述检测移动通信网络的第一频段之前，所述终端驻留在所述移动通信网络的第二小区，且所述终端在所述第二小区未成功发起紧急呼叫。
  27. 根据权利要求17至26中任一项所述的终端，其特征在于，所述通过所述第一小区发起紧急呼叫，包括：
    基于紧急呼叫重拨定时器，通过所述第一小区发起紧急呼叫，其中，所述紧急呼叫重拨定时器的时长小于所述移动通信网络呼叫重拨定时器的时长。
  28. 根据权利要求17至27中任一项所述的终端，其特征在于，所述基于紧急呼叫重拨定时器，通过所述第一小区发起紧急呼叫，包括：
    若通过所述第一小区发起的紧急呼叫失败，则在所述紧急呼叫重拨定时器超时前进行紧急呼叫重拨。
  29. 一种终端，包括：
    射频电路；
    一个或多个处理器；
    存储器；
    多个应用程序；
    以及一个或多个计算机程序，其中所述一个或多个计算机程序被存储在所述存储器中，所述一个或多个计算机程序包括指令，当所述指令被所述终端执行时，使得所述终端执行以下步骤：
    在移动通信网络进行小区搜索；
    在所述移动通信网络成功搜索到第一小区时，基于紧急呼叫重拨定时器，通过所述第一小区发起紧急呼叫，其中，所述紧急呼叫重拨定时器的时长小于所述移动通信网络呼叫 重拨定时器的时长。
  30. 根据权利要求29所述的终端，其特征在于，所述基于紧急呼叫重拨定时器，通过所述第一小区发起紧急呼叫，包括：
    若通过所述第一小区发起的紧急呼叫失败，则在所述紧急呼叫重拨定时器超时前进行紧急呼叫重拨。
  31. 一种终端，包括：
    射频电路；
    一个或多个处理器；
    存储器；
    多个应用程序；
    以及一个或多个计算机程序，其中所述一个或多个计算机程序被存储在所述存储器中，所述一个或多个计算机程序包括指令，当所述指令被所述终端执行时，使得所述终端执行以下步骤：
    确定通过Wifi无线网络成功发起过第一紧急呼叫；
    从所述终端成功发起所述第一紧急呼叫时至所述终端发起第二紧急呼叫时，所述终端与所述Wifi无线网络一直保持连接状态，所述终端通过所述Wifi无线网络发起第二紧急呼叫。
  32. 根据权利要求31所述的终端，其特征在于，所述指令还包括：
    确定所述Wifi无线网络的信号质量大于预定门限。
  33. 一种终端，其特征在于，所述终端包括：
    处理单元，用于获取紧急呼叫请求；
    所述处理单元，还用于检测移动通信网络的第一频段；
    若所述第一频段的能量大于预设的紧急呼叫门限，则所述处理单元还用于在所述第一频段内进行小区搜索，其中，所述紧急呼叫门限大于移动通信网络频段扫描的第一门限；
    通信单元，用于在所述第一频段内成功搜索到第一小区时，通过所述第一小区发起紧急呼叫。
  34. 根据权利要求33所述的终端，其特征在于，在所述终端检测移动通信网络的第一频段之前，所述处理单元还用于：
    确定Wifi无线网络的信号质量大于预定门限。
  35. 根据权利要求33所述的终端，其特征在于，所述第一门限用于非紧急呼叫时所述移动通信网络的频段扫描。
  36. 根据权利要求33所述的终端，其特征在于，所述处理单元还用于：
    在所述第一频段内未成功搜索到小区时，或者，在所述第一频段内未成功发起紧急呼叫时，检测所述移动通信网络的第二频段。
  37. 根据权利要求33至36中任一项所述的终端，其特征在于，所述通信单元还用于：
    在所述移动通信网络的所有频段内未成功搜索到小区时，或者，在所述移动通信网络的所有频段内未成功发起紧急呼叫时，通过所述Wifi无线网络发起紧急呼叫。
  38. 根据权利要求37所述的终端，其特征在于，所述通信单元还用于：
    若所述终端通过所述Wifi无线网络成功发起紧急呼叫，通过所述Wifi无线网络发起 下一次紧急呼叫。
  39. 根据权利要求38所述的终端，其特征在于，所述终端通过所述Wifi无线网络发起下一次紧急呼叫之前，所述处理单元还用于：
    确定Wifi无线网络的信号质量大于预定门限。
  40. 根据权利要求37或38所述的终端，其特征在于，从所述终端成功发起所述紧急呼叫时至所述终端发起所述下一次紧急呼叫时，所述终端与所述Wifi无线网络一直保持连接状态。
  41. 根据权利要求33至40中任一项所述的终端，其特征在于，所述终端检测移动通信网络的第一频段之前，所述终端未驻留在所述移动通信网络。
  42. 根据权利要求33至40中任一项所述的终端，其特征在于，所述终端检测移动通信网络的第一频段之前，所述终端驻留在所述移动通信网络的第二小区，且所述终端在所述第二小区未成功发起紧急呼叫。
  43. 根据权利要求33至42中任一项所述的终端，其特征在于，所述通信单元还用于：
    基于紧急呼叫重拨定时器，通过所述第一小区发起紧急呼叫，其中，所述紧急呼叫重拨定时器的时长小于所述移动通信网络呼叫重拨定时器的时长。
  44. 根据权利要求33至43中任一项所述的终端，其特征在于，处理单元还用于：
    若通过所述第一小区发起的紧急呼叫失败，则在所述紧急呼叫重拨定时器超时前进行紧急呼叫重拨。
  45. 一种终端，其特征在于，所述终端包括：
    处理单元，用于在移动通信网络进行小区搜索；
    通信单元，用于在处理单元在所述移动通信网络成功搜索到第一小区时，基于紧急呼叫重拨定时器，通过所述第一小区发起紧急呼叫，其中，所述紧急呼叫重拨定时器的时长小于所述移动通信网络呼叫重拨定时器的时长。
  46. 根据权利要求45所述的终端，其特征在于，所述处理单元还用于：
    若通过所述第一小区发起的紧急呼叫失败，则在所述紧急呼叫重拨定时器超时前进行紧急呼叫重拨。
  47. 一种终端，其特征在于，所述终端包括：
    处理单元，用于确定所述终端通过Wifi无线网络成功发起过第一紧急呼叫；
    通信单元，用于从所述终端成功发起所述第一紧急呼叫时至所述终端发起第二紧急呼叫时，所述终端与所述Wifi无线网络一直保持连接状态，通过所述Wifi无线网络发起第二紧急呼叫。
  48. 根据权利要求47所述的终端，其特征在于，所述处理单元还用于：
    确定所述Wifi无线网络的信号质量大于预定门限。
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