WO2019061410A1 - 一种异常频点的检测方法及装置、计算机存储介质 - Google Patents

一种异常频点的检测方法及装置、计算机存储介质 Download PDF

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Publication number
WO2019061410A1
WO2019061410A1 PCT/CN2017/104803 CN2017104803W WO2019061410A1 WO 2019061410 A1 WO2019061410 A1 WO 2019061410A1 CN 2017104803 W CN2017104803 W CN 2017104803W WO 2019061410 A1 WO2019061410 A1 WO 2019061410A1
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Prior art keywords
frequency point
location update
network
abnormal
terminal
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PCT/CN2017/104803
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English (en)
French (fr)
Inventor
王旭康
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深圳市云中飞网络科技有限公司
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Filing date
Publication date
Application filed by 深圳市云中飞网络科技有限公司 filed Critical 深圳市云中飞网络科技有限公司
Priority to PCT/CN2017/104803 priority Critical patent/WO2019061410A1/zh
Priority to CN201780002027.6A priority patent/CN108064456B/zh
Publication of WO2019061410A1 publication Critical patent/WO2019061410A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/04—Arrangements for maintaining operational condition

Definitions

  • the present invention relates to the field of Circuit Area Fallback (CSFB), and particularly to a method and device for detecting abnormal frequency points and a computer storage medium.
  • CSFB Circuit Area Fallback
  • LTE Long-term evolution
  • 2G/3G dual-mode terminals are wireless-signal-mode
  • a dual-mode or multi-mode terminal with LTE and 2G/3G access capabilities When using LTE access, 2G/3G circuit domain service signals cannot be transmitted.
  • a CS Circuit Switched
  • PS Packet Switch
  • the originator of the telephone is called the caller (MO, Mobile Origination)
  • the receiver of the call is called the called (MT, Mobile Termination)
  • the MO and the MT each have their own CSFB signaling flow.
  • the MT in the CSFB process the occurrence of various abnormal conditions often leads to the failure of the CSFB process, which leads to the failure of the phone to be connected. How to effectively ensure the success of the CSFB process is an urgent problem to be solved.
  • an embodiment of the present invention provides a method and apparatus for detecting an abnormal frequency point, and a computer storage medium.
  • the terminal When the terminal receives the CS paging message, it applies to multiple global mobile communication systems (GSM, Global System for Mobile Communication) scanning the frequency of the cell;
  • GSM Global System for Mobile Communication
  • the terminal determines a frequency point of the target GSM cell based on the scan result, and uses a frequency point of the target GSM cell as a target frequency point for communication;
  • the terminal performs a location update process based on the target frequency point, and after the location update process is executed, starts a timer to wait for a network to send a call control (CC, Call Control) setup message;
  • CC Call Control
  • the terminal When the terminal does not receive the CC setup message sent by the network before the timer expires, it is determined that the target frequency point is an abnormal frequency point.
  • the terminal performs a location update process based on the target frequency point, including:
  • the terminal sends a location update request message to the network based on the target frequency point;
  • the terminal receives a location update accept message or a location update reject message returned by the network.
  • the timer is started to wait for the network to send a CC setup message, including:
  • the terminal When the terminal receives the location update accept message returned by the network, the terminal starts to wait for the network to send a CC setup message.
  • the timer is a T3240 timer.
  • the method further includes:
  • the frequency of the GSM cell to be scanned is filtered based on the abnormal frequency database, wherein the frequency of the GSM cell to be scanned does not include the abnormal frequency Abnormal frequency in the database.
  • a paging unit configured to receive a CS paging message
  • a frequency point scanning unit configured to scan frequency points of multiple GSM cells
  • a determining unit configured to determine a frequency point of the target GSM cell based on the scan result, and use a frequency point of the target GSM cell as a target frequency point for communication;
  • a location update unit configured to perform a location update process based on the target frequency point, and after the location update process is performed, start a timer to wait for the network to send a CC setup message;
  • the abnormal frequency detecting unit is configured to determine that the target frequency point is an abnormal frequency point when the terminal does not receive the CC setup message sent by the network before the timer expires.
  • the location update unit is specifically configured to: send a location update request message to the network according to the target frequency point; and receive a location update accept message or a location update reject message returned by the network.
  • the location update unit is further configured to: when receiving the location update accept message returned by the network, start the timer to wait for the network to send the CC setup message.
  • the timer is a T3240 timer.
  • the device further includes:
  • a marking unit configured to mark the abnormal frequency point and store the marked abnormal frequency point in the abnormal frequency point database
  • a screening unit configured to: when the CS paging message is received again, filter, according to the abnormal frequency point database, a frequency of the GSM cell to be scanned, where the frequency of the GSM cell to be scanned does not include the abnormality The frequency of the anomaly in the frequency database.
  • the computer storage medium provided by the embodiment of the present invention has computer executable instructions stored thereon, and the computer executable instructions are implemented by the processor to implement the abnormal frequency detection method.
  • the terminal when receiving the CS paging message, the terminal scans the frequency points of the multiple GSM cells; the terminal determines the frequency of the target GSM cell based on the scanning result, and uses the target GSM.
  • the frequency point of the cell serves as a target frequency point for communication; the terminal is based on The target frequency point performs a location update process, and after the location update process is executed, the timer is started to wait for the network to send a CC setup message; when the timer expires, the terminal does not receive the network.
  • the generated CC establishes a message, it is determined that the target frequency point is an abnormal frequency point.
  • the technical solution of the embodiment of the present invention can detect the frequency of an abnormal GSM cell in a scenario across the MSC-pool, so that in the subsequent CSFB process, these abnormal frequency points are directly ignored, and the CSFB process is greatly improved.
  • the probability of success increases the user's calling experience.
  • FIG. 2 is a schematic flowchart 1 of a method for detecting an abnormal frequency point according to an embodiment of the present invention
  • FIG. 3 is a second schematic flowchart of a method for detecting an abnormal frequency point according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram 1 of a structure of an abnormal frequency detecting device according to an embodiment of the present invention.
  • FIG. 5 is a second structural diagram of a device for detecting an abnormal frequency point according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
  • the CSFB-enabled terminal can search for the LTE network, complete the LTE/2G network joint registration, and be able to voice call and call.
  • the CSFB process includes three phases: 1) the UE initiates a call (corresponding to MO) on the LTE network, or receives a page (corresponding to the MT); 2) the UE falls back under the guidance of the LTE network and searches for a suitable GSM cell for access; 3) The UE reads the GSM cell system broadcast message and establishes a voice call.
  • a more important process in the CSFB process is the location update process.
  • FIG. 1 is a flowchart of a location update according to an embodiment of the present invention. As shown in FIG. 1, the location update process includes the following steps:
  • Step 101 The UE is powered on, and performs an Evolved Packet System (EPS)/International Mobile Subscriber Identification Number (IMSI) attachment.
  • EPS Evolved Packet System
  • IMSI International Mobile Subscriber Identification Number
  • Step 102 The UE receives the CS paging message.
  • Step 103 The UE scans frequency points of multiple GSM cells, and selects a frequency point of a GSM cell for communication.
  • the frequency point of the selected GSM cell is referred to as a target frequency point.
  • the step further includes: the UE sending an RR channel request message (RR_CHANNEL_REQUEST) to the network based on the target frequency point.
  • the UE receives the network reply IM message, and obtains the RR channel allocated by the network through the IM message.
  • Step 104 The UE sends a location update request message (LU_REQUEST) to the network.
  • LU_REQUEST location update request message
  • the UE needs to send an LU_REQUEST to the network when moving between different cells to perform a location update procedure.
  • Step 105 The UE receives a location update accept message (LU_ACCEPT) of the network reply.
  • LU_ACCEPT location update accept message
  • Step 106 The UE starts the T3240 timer.
  • the UE after receiving the LU_ACCEPT, the UE immediately starts the T3240 timer to enter the location update state, and waits for the RR issued by the network to establish a connection message.
  • Step 107 Before the T3240 timer expires, the terminal receives the CC establishment (CC_setup) message sent by the network, and the MT call succeeds.
  • CC_setup CC establishment
  • Step 108 Before the T3240 timer expires, the terminal does not receive the CC connection establishment message sent by the network, and the terminal waits for the radio resource (RR, Radio Resource) connection triggered by the network to be released.
  • RR Radio Resource
  • the MT call fails due to various special scenarios of the LTE network.
  • the MT call under the mobile switching center (MSC)-pool when the UE is just in the MSC-pool boundary area, CSFB is prone to abnormal conditions, usually showing a probabilistic MT call failure.
  • MSC mobile switching center
  • the embodiment of the present invention provides a method for detecting an abnormal frequency point, which can effectively detect the frequency of the abnormal GSM cell, thereby effectively avoiding subsequent re-access to the abnormal frequency point. A problem that caused the CSFB process to fail.
  • FIG. 2 is a schematic flowchart 1 of a method for detecting an abnormal frequency point according to an embodiment of the present invention. As shown in FIG. 2, the method for detecting an abnormal frequency point includes the following steps:
  • Step 201 When the terminal receives the CS paging message, the terminal scans the frequency points of the multiple GSM cells.
  • the terminal refers to the MT, and after the terminal is powered on, the joint EPS/IMSI attachment is first performed. Then, the terminal receives the CS paging message sent by the network side.
  • the MO is required to initiate a call for the MT first, and then the MT receives the CS paging message sent by the network side.
  • the mobile services switching center (MSC) in the network sends the SGsAP-PAGING-REQUEST message according to the existing SGs association and Mobility Management Entity (MME) information.
  • MME Mobility Management Entity
  • the SGsAP-PAGING-REQUEST message carries the following information: IMSI, Temporary Mobile Subscriber Identity (TMSI), Service Indicator, Calling Number, and Location Area Information.
  • TMSI Temporary Mobile Subscriber Identity
  • Service Indicator Service Indicator
  • Calling Number Calling Number
  • Location Area Information The MME sends a paging message to the base station, and the base station initiates an air interface Paging process.
  • the UE establishes a connection and sends an Extended Service Request message to the MME.
  • the MME sends an SGsAP-SERVICE-REQUEST message to the MSC.
  • the MSC receives the message and does not resend the paging request message to the MME.
  • the MSC receives the SGs Service Request message containing the idle state indication, first notifying that the calling call is in the process of being connected.
  • the MME sends an Initial UE Context Setup message to the base station, where the Initial UE Context Setup message carries the CS Fallback Indicator, CS.
  • the Fallback Indicator is used to indicate that the base station UE needs to fall back to the UMTS Terrestrial Radio Access Network (UMRAN, GSM EDGE Radio Access Network) or the GSM EDGE Radio Access Network (GERAN) due to the CSFB service.
  • UMRAN UMTS Terrestrial Radio Access Network
  • GERAN GSM EDGE Radio Access Network
  • the frequency of the multiple GSM cells is scanned.
  • the network side may configure a 2G frequency point group for the terminal, where the 2G frequency point group includes frequency points of multiple GSM cells, and then the terminal scans the frequency points of the multiple GSM cells.
  • the terminal can also perform frequency point scanning directly in a certain 2G frequency range.
  • the results of the scanning include, but are not limited to, the signal strength of the frequency points of the respective GSM cells.
  • Step 202 The terminal determines a frequency point of the target GSM cell based on the scan result, and uses a frequency point of the target GSM cell as a target frequency point for communication.
  • the terminal determines, according to the scanning result, the frequency point of the target GSM cell, specifically: the terminal determines the frequency point with the strongest signal strength from the signal strength of the frequency point of each GSM cell, as the communication is used. Target frequency.
  • Step 203 The terminal performs a location update process based on the target frequency, and starts a timer to wait for the network to send a CC setup message after the location update process is performed.
  • the terminal sends a location update request message (LU_REQUEST) to the network based on the target frequency point; the terminal receives a location update accept message (LU_ACCEPT) or a location update reject message (LU_REJECT) returned by the network.
  • LU_REQUEST a location update request message
  • LU_ACCEPT a location update accept message
  • LU_REJECT a location update reject message
  • the T3210 timer when the terminal sends a location update request message to the network, the T3210 timer is started.
  • the location update request message includes a type of location update, for example, a normal location update, an IMSI attachment, and a periodic location update. If the network accepts a location update request or rejects a location update request, the T3210 timer is stopped. If the T3210 timer expires, the network does not respond to the terminal, then the T3211 timer is started. After receiving the location update accept message of the network reply, the terminal stores the local location identifier (LAI, Location Area Identification), and stops the T3210 timer.
  • LAI Local Location identifier
  • the terminal when the terminal receives the location update accept message returned by the network, the terminal stops T3210. At the same time as the timer, the T3240 timer is enabled to wait for the network to send a CC setup message.
  • Step 204 Determine that the target frequency point is an abnormal frequency point when the terminal does not receive the CC setup message sent by the network before the timer expires.
  • the terminal when the terminal does not receive the CC setup message sent by the network before the T3240 timer expires, the terminal indicates that the MT call fails, and the selected target frequency is determined to be an abnormal frequency. .
  • FIG. 3 is a schematic flowchart 2 of a method for detecting an abnormal frequency point according to an embodiment of the present invention. As shown in FIG. 3, the method for detecting an abnormal frequency point includes the following steps:
  • Step 301 When the terminal receives the CS paging message, the terminal scans the frequency points of the multiple GSM cells.
  • the terminal refers to the MT, and after the terminal is powered on, the joint EPS/IMSI attachment is first performed. Then, the terminal receives the CS paging message sent by the network side.
  • the MO is required to initiate a call for the MT first, and then the MT receives the CS paging message sent by the network side.
  • the frequency of the multiple GSM cells is scanned.
  • the network side may configure a 2G frequency point group for the terminal, where the 2G frequency point group includes frequency points of multiple GSM cells, and then the terminal scans the frequency points of the multiple GSM cells.
  • the terminal can also perform frequency point scanning directly in a certain 2G frequency range.
  • the results of the scanning include, but are not limited to, the signal strength of the frequency points of the respective GSM cells.
  • Step 302 The terminal determines a frequency point of the target GSM cell based on the scan result, and uses a frequency point of the target GSM cell as a target frequency point for communication.
  • the terminal determines, according to the scanning result, the frequency point of the target GSM cell, specifically: the terminal determines the frequency point with the strongest signal strength from the signal strength of the frequency point of each GSM cell, as the communication is used. Target frequency.
  • Step 303 The terminal performs a location update process based on the target frequency, and starts a timer to wait for the network to send a CC setup message after the location update process is performed.
  • the terminal sends a location update request message (LU_REQUEST) to the network based on the target frequency point; the terminal receives a location update accept message (LU_ACCEPT) or a location update reject message (LU_REJECT) returned by the network.
  • LU_REQUEST a location update request message
  • LU_ACCEPT a location update accept message
  • LU_REJECT a location update reject message
  • the T3210 timer when the terminal sends a location update request message to the network, the T3210 timer is started.
  • the location update request message includes a type of location update, for example, a normal location update, an IMSI attachment, and a periodic location update. If the network accepts a location update request or rejects a location update request, the T3210 timer is stopped. If the T3210 timer expires, the network does not respond to the terminal, then the T3211 timer is started. After receiving the location update accept message of the network reply, the terminal stores the LAI and stops the T3210 timer.
  • the terminal when receiving the location update accept message returned by the network, the terminal stops the T3210 timer and starts the T3240 timer to wait for the network to send a CC setup message.
  • Step 304 When the terminal does not receive the CC setup message sent by the network before the timer expires, it is determined that the target frequency point is an abnormal frequency point.
  • the terminal when the terminal does not receive the CC setup message sent by the network before the T3240 timer expires, the terminal indicates that the MT call fails, and the selected target frequency is determined to be an abnormal frequency. .
  • Step 305 Mark the abnormal frequency point, and store the marked abnormal frequency point into the abnormal frequency point database.
  • Step 306 When the terminal receives the CS paging message again, the frequency of the GSM cell to be scanned is filtered out according to the abnormal frequency point database, where the frequency of the GSM cell to be scanned does not include the Abnormal frequency points in the abnormal frequency database.
  • FIG. 4 is a first schematic structural diagram of a device for detecting an abnormal frequency point according to an embodiment of the present invention. As shown in FIG. 4, the detecting device for the abnormal frequency point includes:
  • the paging unit 401 is configured to receive the CS paging message
  • the frequency point scanning unit 402 is configured to scan frequency points of multiple GSM cells
  • the determining unit 403 is configured to determine a frequency point of the target GSM cell based on the scan result, and use a frequency point of the target GSM cell as a target frequency point for communication;
  • the location update unit 404 is configured to perform a location update process based on the target frequency point, and after the location update process is executed, start a timer to wait for the network to send a CC setup message;
  • the abnormal frequency detecting unit 405 is configured to determine that the target frequency point is an abnormal frequency point when the terminal does not receive the CC setup message sent by the network before the timer expires.
  • the location update unit 404 is specifically configured to: send a location update request message to the network based on the target frequency point; and receive a location update accept message or a location update reject message returned by the network.
  • the location update unit 404 is further configured to: when receiving the location update accept message returned by the network, enable the timer to wait for the network to send a CC setup message.
  • the timer is a T3240 timer.
  • each unit in the detecting device of the abnormal frequency shown in FIG. 4 can be understood by referring to the related description of the detecting method of the abnormal frequency.
  • the function of each unit in the detecting device of the abnormal frequency shown in FIG. 4 can be realized by a program running on the processor, or can be realized by a specific logic circuit.
  • FIG. 5 is a schematic structural diagram of a structure of an abnormal frequency detection apparatus according to an embodiment of the present invention. As shown in FIG. 5, the abnormal frequency detection apparatus includes:
  • the paging unit 501 is configured to receive the CS paging message
  • the frequency point scanning unit 502 is configured to scan frequency points of multiple GSM cells
  • the determining unit 503 is configured to determine a frequency point of the target GSM cell based on the scan result, and use a frequency point of the target GSM cell as a target frequency point for communication;
  • the location update unit 504 is configured to perform a location update process based on the target frequency point, and after the location update process is performed, start a timer to wait for the network to send a CC setup message;
  • the abnormal frequency detecting unit 505 is configured to: before the timer expires, the terminal does not When receiving the CC setup message sent by the network, determining that the target frequency point is an abnormal frequency point.
  • the location update unit 504 is specifically configured to: send a location update request message to the network according to the target frequency point; and receive a location update accept message or a location update reject message returned by the network.
  • the location update unit 504 is further configured to: when receiving the location update accept message returned by the network, enable the timer to wait for the network to send a CC setup message.
  • the timer is a T3240 timer.
  • the device further includes:
  • the marking unit 506 is configured to mark the abnormal frequency point and store the marked abnormal frequency point in the abnormal frequency point database
  • the screening unit 507 is configured to: when the CS paging message is received again, filter, according to the abnormal frequency point database, a frequency point of the GSM cell to be scanned, where the frequency of the GSM cell to be scanned does not include the Abnormal frequency points in the abnormal frequency database.
  • each unit in the detecting device of the abnormal frequency shown in FIG. 5 can be understood by referring to the related description of the detecting method of the abnormal frequency.
  • the function of each unit in the detecting device of the abnormal frequency shown in FIG. 5 can be realized by a program running on the processor, or can be realized by a specific logic circuit.
  • the abnormal frequency detecting device described above may be stored in a computer readable storage medium if it is implemented in the form of a software function module and sold or used as an independent product.
  • the technical solution of the embodiments of the present invention may be embodied in the form of a software product in essence or in the form of a software product stored in a storage medium, including a plurality of instructions.
  • a computer device (which may be a personal computer, server, or network device, etc.) is caused to perform all or part of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read only memory (ROM), a magnetic disk or an optical disk, and the like, which can store program codes. quality.
  • embodiments of the invention are not limited to any specific combination of hardware and software.
  • the embodiment of the present invention further provides a computer storage medium, wherein the computer executable instructions are stored, and the computer executable instructions are executed by the processor to implement the foregoing method for detecting an abnormal frequency point in the embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
  • the terminal 60 may include one or more (only one shown) processor 602.
  • the processor 602 may include but is not limited to micro processing.
  • a processing device such as a Micro Controller Unit (MCU) or a Programmable Gate Array (FPGA), a memory 604 for storing data, and a transmission device 606 for communication functions.
  • MCU Micro Controller Unit
  • FPGA Programmable Gate Array
  • FIG. 6 is merely illustrative and does not limit the structure of the above electronic device.
  • terminal 60 may also include more or fewer components than shown in FIG. 6, or have a different configuration than that shown in FIG.
  • the memory 604 can be used to store software programs and modules of application software, such as program instructions/modules corresponding to the method for determining channel frequency hopping in the embodiment of the present invention, and the processor 602 runs the software program and module stored in the memory 604, thereby The above methods are implemented by performing various functional applications and data processing.
  • Memory 604 can include high speed random access memory and can also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid state memory.
  • memory 604 can further include memory remotely located relative to processor 602, which can be connected to terminal 60 over a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.
  • Transmission device 606 is for receiving or transmitting data via a network.
  • the network specific examples described above may include a wireless network provided by a communication provider of the terminal 60.
  • transmission device 606 includes a network interface controller (NIC) that can be connected to other network devices through a base station to communicate with the Internet.
  • NIC network interface controller
  • the transmission The device 606 can be a radio frequency (RF) module for communicating with the Internet wirelessly.
  • RF radio frequency
  • the disclosed method and smart device 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 such as: multiple units or components may be combined, or Can be integrated into another system, or some features can be ignored or not executed.
  • the coupling, or direct coupling, or communication connection of the components shown or discussed may be indirect coupling or communication connection through some interfaces, devices or units, and may be electrical, mechanical or other forms. of.
  • the units described above as separate components may or may not be physically separated, and the components displayed as the unit may or may not be physical units, that is, may be located in one place or 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 invention may be integrated into one second processing unit, or each unit may be separately used as one unit, or two or more units may be integrated into one unit;
  • the above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.

Abstract

本发明公开了一种异常频点的检测方法及装置、计算机存储介质，所述方法包括：终端接收到CS寻呼消息时，对多个GSM小区的频点进行扫描；所述终端基于扫描结果，确定出目标GSM小区的频点，将所述目标GSM小区的频点作为用于通信的目标频点；所述终端基于所述目标频点执行位置更新流程，并在执行完所述位置更新流程后开启定时器等待网络下发CC建立消息；当在所述定时器超时之前，所述终端未接收到所述网络下发的CC建立消息时，确定所述目标频点为异常频点。

Description

一种异常频点的检测方法及装置、计算机存储介质 技术领域
本发明涉及电路域回落(CSFB，Circuit Switched Fallback)技术领域，尤其涉及一种异常频点的检测方法及装置、计算机存储介质。
背景技术
由于长期演进(LTE，Long Term Evolution)和2G/3G双模终端的无线通信是单一无线模式(Signal-radio mode)，因此，具有LTE和2G/3G接入能力的双模或者多模终端，在使用LTE接入时，无法传输2G/3G电路域业务信号。为了使终端(UE，User Equipment)在LTE接入或驻留下能够进行话音等电路域(CS，Circuit Switched)业务，并且能够对UE在LTE接入下正在进行的分组域(PS，Packet Switch)业务进行正确地处理，产生了CSFB技术。
在CSFB过程中，电话的发起者称为主叫(MO，Mobile Origination)，电话的接收者称为被叫(MT，Mobile Termination)，MO和MT各自对应有自己的CSFB信令流程。对于CSFB过程中的MT而言，由于各种异常情况的出现经常会导致CSFB过程失败，从而导致电话无法接通，如何有效确保CSFB过程成功是亟待解决的问题。
发明内容
为解决上述技术问题，本发明实施例提供了一种异常频点的检测方法及装置、计算机存储介质。
本发明实施例提供的异常频点的检测方法，包括：
终端接收到CS寻呼消息时，对多个全球移动通信系统(GSM，Global  System for Mobile Communication)小区的频点进行扫描；
所述终端基于扫描结果，确定出目标GSM小区的频点，将所述目标GSM小区的频点作为用于通信的目标频点；
所述终端基于所述目标频点执行位置更新流程，并在执行完所述位置更新流程后开启定时器等待网络下发呼叫控制(CC，Call Control)建立消息；
当在所述定时器超时之前，所述终端未接收到所述网络下发的CC建立消息时，确定所述目标频点为异常频点。
本发明实施例中，所述终端基于所述目标频点执行位置更新流程，包括：
所述终端基于所述目标频点，向网络发送位置更新请求消息；
所述终端接收所述网络返回的位置更新接受消息或者位置更新拒绝消息。
本发明实施例中，所述在执行完所述位置更新流程后开启定时器等待网络下发CC建立消息，包括：
所述终端接收到所述网络返回的位置更新接受消息时，开启定时器等待网络下发CC建立消息。
本发明实施例中，所述定时器为T3240定时器。
本发明实施例中，所述方法还包括：
对所述异常频点进行标记，并将标记后的异常频点存储至异常频点数据库中；
当所述终端再次接收到CS寻呼消息时，基于所述异常频点数据库筛选出待扫描的GSM小区的频点，其中，所述待扫描的GSM小区的频点不包括所述异常频点数据库中的异常频点。
本发明实施例提供的异常频点的检测装置，包括：
寻呼单元，配置为接收到CS寻呼消息；
频点扫描单元，配置为对多个GSM小区的频点进行扫描；
确定单元，配置为基于扫描结果，确定出目标GSM小区的频点，将所述目标GSM小区的频点作为用于通信的目标频点；
位置更新单元，配置为基于所述目标频点执行位置更新流程，并在执行完所述位置更新流程后开启定时器等待网络下发CC建立消息；
异常频点检测单元，配置为当在所述定时器超时之前，所述终端未接收到所述网络下发的CC建立消息时，确定所述目标频点为异常频点。
本发明实施例中，所述位置更新单元，具体配置为：基于所述目标频点，向网络发送位置更新请求消息；接收所述网络返回的位置更新接受消息或者位置更新拒绝消息。
本发明实施例中，所述位置更新单元，还配置为接收到所述网络返回的位置更新接受消息时，开启定时器等待网络下发CC建立消息。
本发明实施例中，所述定时器为T3240定时器。
本发明实施例中，所述装置还包括：
标记单元，配置为对所述异常频点进行标记，并将标记后的异常频点存储至异常频点数据库中；
筛选单元，配置为当再次接收到CS寻呼消息时，基于所述异常频点数据库筛选出待扫描的GSM小区的频点，其中，所述待扫描的GSM小区的频点不包括所述异常频点数据库中的异常频点。
本发明实施例提供的计算机存储介质，其上存储有计算机可执行指令，该计算机可执行指令被处理器执行时实现上述的异常频点的检测方法。
本发明实施例的技术方案中，终端接收到CS寻呼消息时，对多个GSM小区的频点进行扫描；所述终端基于扫描结果，确定出目标GSM小区的频点，将所述目标GSM小区的频点作为用于通信的目标频点；所述终端基于 所述目标频点执行位置更新流程，并在执行完所述位置更新流程后开启定时器等待网络下发CC建立消息；当在所述定时器超时之前，所述终端未接收到所述网络下发的CC建立消息时，确定所述目标频点为异常频点。采用本发明实施例的技术方案，能够在跨MSC-pool的场景下检测出异常的GSM小区的频点，这样，在后续进行CSFB过程中，直接忽略掉这些异常频点，大大提高了CSFB过程成功的概率，提升了用户呼叫体验。
附图说明
图1为本发明实施例的位置更新流程图；
图2为本发明实施例的异常频点的检测方法的流程示意图一；
图3为本发明实施例的异常频点的检测方法的流程示意图二；
图4为本发明实施例的异常频点的检测装置的结构组成示意图一；
图5为本发明实施例的异常频点的检测装置的结构组成示意图二；
图6为本发明实施例的终端的结构组成示意图。
具体实施方式
为了能够更加详尽地了解本发明实施例的特点与技术内容，下面结合附图对本发明实施例的实现进行详细阐述，所附附图仅供参考说明之用，并非用来限定本发明实施例。
正常情况下，具有CSFB功能的终端开机能够搜索LTE网络，完成LTE/2G网络联合注册，并能够进行语音主叫及被叫。
CSFB过程包括三个阶段：1)UE在LTE网络发起呼叫(对应于MO)，或者接收寻呼(对应于MT)；2)UE在LTE网络指引下回落并搜索合适的GSM小区进行接入；3)UE读取GSM小区系统广播消息并建立语音通话。
此外，CSFB过程中的比较重要的一个过程是位置更新过程，以下对UE的位置更新过程进行阐述。
图1为本发明实施例的位置更新流程图，如图1所示，所述位置更新流程包括以下步骤：
步骤101：UE开机，并执行联合演进分组系统(EPS，Evolved Packet System)/国际移动用户识别码(IMSI，International Mobile Subscriber Identification Number)附着。
步骤102：UE接收到CS寻呼消息。
步骤103：UE扫描多个GSM小区的频点，并选择出一个GSM小区的频点用于进行通信。
这里，将所选择出的GSM小区的频点称为目标频点。
本步骤还包括：UE基于所述目标频点，向网络发送RR信道请求消息(RR_CHANNEL_REQUEST)。UE接收网络回复IM消息，通过IM消息获得网络分配的RR信道。
步骤104：UE向网络发送位置更新请求消息(LU_REQUEST)。
这里，UE在不同小区之间移动时需要向网络发送LU_REQUEST，以执行位置更新流程。
步骤105：UE接收网络回复的位置更新接受消息(LU_ACCEPT)。
步骤106：UE开启T3240定时器。
这里，UE收到LU_ACCEPT后，便立即启动T3240定时器进入位置更新状态，等待由网络下发的RR建立连接消息。
步骤107：在T3240定时器超时之前，终端接收到网络下发的CC建立(CC_setup)消息，至此，MT call成功。
步骤108：在T3240定时器超时之前，终端未接收到网络下发的CC建立连接消息，终端等待网络触发的无线资源(RR，Radio Resource)连接释放。
对于MT而言，由于LTE网络存在种种特殊场景，使得MT call失败。 例如：跨移动交换中心(MSC)-池(pool)下的MT call，当UE刚好处在MSC-pool边界区域的时候，CSFB容易出现异常情况，通常表现为概率性的MT call失败。
对于因位置更新导致CSFB过程失败的问题，本发明实施例提出了一种异常频点的检测方法，能够有效检测到异常的GSM小区的频点，从而可以有效避免后续再次接入到异常频点导致CSFB过程失败的问题出现。
图2为本发明实施例的异常频点的检测方法的流程示意图一，如图2所示，所述异常频点的检测方法包括以下步骤：
步骤201：终端接收到CS寻呼消息时，对多个GSM小区的频点进行扫描。
本发明实施例中，终端是指MT，终端开机后，首先执行联合EPS/IMSI附着。然后，终端接收到网络侧下发的CS寻呼消息。这里，需要MO首先发起针对MT的呼叫，而后，MT才接收到网络侧下发的CS寻呼消息。
具体地，网络中的移动业务交换中心(MSC)收到初始地址请求(IAM)入局消息后，根据存在的SGs关联和移动管理实体(MME，Mobility Management Entity)信息，发送SGsAP-PAGING-REQUEST消息给MME，这里，SGsAP-PAGING-REQUEST消息携带如下信息：IMSI、临时移动用户标识(TMSI，Temporary Mobile Subscriber Identity)、业务标识(Service indicator)、主叫号码、位置区信息。MME发送寻呼(Paging)消息给基站，基站发起空口的Paging流程。UE建立连接并发送Extended Service Request消息给MME，MME发送SGsAP-SERVICE-REQUEST消息给MSC，MSC收到此消息，不再向MME重发寻呼请求消息。为避免呼叫接续过程中，主叫等待时间过长，MSC收到包含空闲态指示的SGs Service Request消息，先通知主叫呼叫正在接续过程中。MME发送Initial UE Context Setup消息给基站，这里，Initial UE Context Setup消息携带CS Fallback Indicator，CS  Fallback Indicator用于指示基站UE因CSFB业务需要回落到UMTS陆地无线接入网(UTRAN，UMTS Terrestrial Radio Access Network)/GSM/EDGE无线接入网(GERAN，GSM EDGE Radio Access Network)。
当终端接收到CS寻呼消息时，对多个GSM小区的频点进行扫描。这里，网络侧可以为终端配置一个2G频点组，这个2G频点组中包括多个GSM小区的频点，然后，终端对这多个GSM小区的频点进行扫描。当然，终端也可以直接在某个2G频段范围内进行频点扫描。这里，扫描的结果包括但不限于有：各个GSM小区的频点的信号强度。
步骤202：所述终端基于扫描结果，确定出目标GSM小区的频点，将所述目标GSM小区的频点作为用于通信的目标频点。
本发明实施例中，终端基于扫描结果，确定出目标GSM小区的频点具体包括：终端从各个GSM小区的频点的信号强度中，确定出信号强度最强的频点，作为用于通信的目标频点。
步骤203：所述终端基于所述目标频点执行位置更新流程，并在执行完所述位置更新流程后开启定时器等待网络下发CC建立消息。
具体地，所述终端基于所述目标频点，向网络发送位置更新请求消息(LU_REQUEST)；所述终端接收所述网络返回的位置更新接受消息(LU_ACCEPT)或者位置更新拒绝消息(LU_REJECT)。
这里，终端向网络发送位置更新请求消息时，启动T3210定时器，这里，位置更新请求消息中包括位置更新的类型，例如：正常位置更新、IMSI附着、周期性位置更新。若网络接受位置更新请求或者拒绝位置更新请求，则停止T3210定时器。若T3210定时器超时网络没有回应终端，则启动T3211定时器。终端接收到网络回复的位置更新接受消息后，存储本地位置标识(LAI，Location Area Identification)，并停止T3210定时器。
这里，终端接收到所述网络返回的位置更新接受消息时，停止T3210 定时器的同时，开启T3240定时器等待网络下发CC建立消息。
步骤204：当在所述定时器超时之前，所述终端未接收到所述网络下发的CC建立消息时，确定所述目标频点为异常频点。
本发明实施例中，在T3240定时器超时之前，所述终端未接收到所述网络下发的CC建立消息时，也即表明了MT call失败，可以确定所选择的目标频点为异常频点。
图3为本发明实施例的异常频点的检测方法的流程示意图二，如图3所示，所述异常频点的检测方法包括以下步骤：
步骤301：终端接收到CS寻呼消息时，对多个GSM小区的频点进行扫描。
本发明实施例中，终端是指MT，终端开机后，首先执行联合EPS/IMSI附着。然后，终端接收到网络侧下发的CS寻呼消息。这里，需要MO首先发起针对MT的呼叫，而后，MT才接收到网络侧下发的CS寻呼消息。
当终端接收到CS寻呼消息时，对多个GSM小区的频点进行扫描。这里，网络侧可以为终端配置一个2G频点组，这个2G频点组中包括多个GSM小区的频点，然后，终端对这多个GSM小区的频点进行扫描。当然，终端也可以直接在某个2G频段范围内进行频点扫描。这里，扫描的结果包括但不限于有：各个GSM小区的频点的信号强度。
步骤302：所述终端基于扫描结果，确定出目标GSM小区的频点，将所述目标GSM小区的频点作为用于通信的目标频点。
本发明实施例中，终端基于扫描结果，确定出目标GSM小区的频点具体包括：终端从各个GSM小区的频点的信号强度中，确定出信号强度最强的频点，作为用于通信的目标频点。
步骤303：所述终端基于所述目标频点执行位置更新流程，并在执行完所述位置更新流程后开启定时器等待网络下发CC建立消息。
具体地，所述终端基于所述目标频点，向网络发送位置更新请求消息(LU_REQUEST)；所述终端接收所述网络返回的位置更新接受消息(LU_ACCEPT)或者位置更新拒绝消息(LU_REJECT)。
这里，终端向网络发送位置更新请求消息时，启动T3210定时器，这里，位置更新请求消息中包括位置更新的类型，例如：正常位置更新、IMSI附着、周期性位置更新。若网络接受位置更新请求或者拒绝位置更新请求，则停止T3210定时器。若T3210定时器超时网络没有回应终端，则启动T3211定时器。终端接收到网络回复的位置更新接受消息后，存储LAI，并停止T3210定时器。
这里，终端接收到所述网络返回的位置更新接受消息时，停止T3210定时器的同时，开启T3240定时器等待网络下发CC建立消息。
步骤304：当在所述定时器超时之前，所述终端未接收到所述网络下发的CC建立消息时，确定所述目标频点为异常频点。
本发明实施例中，在T3240定时器超时之前，所述终端未接收到所述网络下发的CC建立消息时，也即表明了MT call失败，可以确定所选择的目标频点为异常频点。
步骤305：对所述异常频点进行标记，并将标记后的异常频点存储至异常频点数据库中。
步骤306：当所述终端再次接收到CS寻呼消息时，基于所述异常频点数据库筛选出待扫描的GSM小区的频点，其中，所述待扫描的GSM小区的频点不包括所述异常频点数据库中的异常频点。
图4为本发明实施例的异常频点的检测装置的结构组成示意图一，如图4所示，所述异常频点的检测装置包括：
寻呼单元401，配置为接收到CS寻呼消息；
频点扫描单元402，配置为对多个GSM小区的频点进行扫描；
确定单元403，配置为基于扫描结果，确定出目标GSM小区的频点，将所述目标GSM小区的频点作为用于通信的目标频点；
位置更新单元404，配置为基于所述目标频点执行位置更新流程，并在执行完所述位置更新流程后开启定时器等待网络下发CC建立消息；
异常频点检测单元405，配置为当在所述定时器超时之前，所述终端未接收到所述网络下发的CC建立消息时，确定所述目标频点为异常频点。
本发明实施例中，所述位置更新单元404，具体配置为：基于所述目标频点，向网络发送位置更新请求消息；接收所述网络返回的位置更新接受消息或者位置更新拒绝消息。
本发明实施例中，所述位置更新单元404，还配置为接收到所述网络返回的位置更新接受消息时，开启定时器等待网络下发CC建立消息。
本发明实施例中，所述定时器为T3240定时器。
本领域技术人员应当理解，图4所示的异常频点的检测装置中的各单元的实现功能可参照前述异常频点的检测方法的相关描述而理解。图4所示的异常频点的检测装置中的各单元的功能可通过运行于处理器上的程序而实现，也可通过具体的逻辑电路而实现。
图5为本发明实施例的异常频点的检测装置的结构组成示意图二，如图5所示，所述异常频点的检测装置包括：
寻呼单元501，配置为接收到CS寻呼消息；
频点扫描单元502，配置为对多个GSM小区的频点进行扫描；
确定单元503，配置为基于扫描结果，确定出目标GSM小区的频点，将所述目标GSM小区的频点作为用于通信的目标频点；
位置更新单元504，配置为基于所述目标频点执行位置更新流程，并在执行完所述位置更新流程后开启定时器等待网络下发CC建立消息；
异常频点检测单元505，配置为当在所述定时器超时之前，所述终端未 接收到所述网络下发的CC建立消息时，确定所述目标频点为异常频点。
本发明实施例中，所述位置更新单元504，具体配置为：基于所述目标频点，向网络发送位置更新请求消息；接收所述网络返回的位置更新接受消息或者位置更新拒绝消息。
本发明实施例中，所述位置更新单元504，还配置为接收到所述网络返回的位置更新接受消息时，开启定时器等待网络下发CC建立消息。
本发明实施例中，所述定时器为T3240定时器。
本发明实施例中，所述装置还包括：
标记单元506，配置为对所述异常频点进行标记，并将标记后的异常频点存储至异常频点数据库中；
筛选单元507，配置为当再次接收到CS寻呼消息时，基于所述异常频点数据库筛选出待扫描的GSM小区的频点，其中，所述待扫描的GSM小区的频点不包括所述异常频点数据库中的异常频点。
本领域技术人员应当理解，图5所示的异常频点的检测装置中的各单元的实现功能可参照前述异常频点的检测方法的相关描述而理解。图5所示的异常频点的检测装置中的各单元的功能可通过运行于处理器上的程序而实现，也可通过具体的逻辑电路而实现。
本发明实施例上述的异常频点的检测装置如果以软件功能模块的形式实现并作为独立的产品销售或使用时，也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，本发明实施例的技术方案本质上或者说对现有技术做出贡献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)执行本发明各个实施例所述方法的全部或部分。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read Only Memory)、磁碟或者光盘等各种可以存储程序代码的介 质。这样，本发明实施例不限制于任何特定的硬件和软件结合。
相应地，本发明实施例还提供一种计算机存储介质，其中存储有计算机可执行指令，该计算机可执行指令被处理器执行时实现本发明实施例的上述的异常频点的检测方法。
图6为本发明实施例的终端的结构组成示意图，如图6所示，终端60可以包括一个或多个(图中仅示出一个)处理器602(处理器602可以包括但不限于微处理器(MCU，Micro Controller Unit)或可编程逻辑器件(FPGA，Field Programmable Gate Array)等的处理装置)、用于存储数据的存储器604、以及用于通信功能的传输装置606。本领域普通技术人员可以理解，图6所示的结构仅为示意，其并不对上述电子装置的结构造成限定。例如，终端60还可包括比图6中所示更多或者更少的组件，或者具有与图6所示不同的配置。
存储器604可用于存储应用软件的软件程序以及模块，如本发明实施例中的信道跳频的确定方法对应的程序指令/模块，处理器602通过运行存储在存储器604内的软件程序以及模块，从而执行各种功能应用以及数据处理，即实现上述的方法。存储器604可包括高速随机存储器，还可包括非易失性存储器，如一个或者多个磁性存储装置、闪存、或者其他非易失性固态存储器。在一些实例中，存储器604可进一步包括相对于处理器602远程设置的存储器，这些远程存储器可以通过网络连接至终端60。上述网络的实例包括但不限于互联网、企业内部网、局域网、移动通信网及其组合。
传输装置606用于经由一个网络接收或者发送数据。上述的网络具体实例可包括终端60的通信供应商提供的无线网络。在一个实例中，传输装置606包括一个网络适配器(NIC，Network Interface Controller)，其可通过基站与其他网络设备相连从而可与互联网进行通讯。在一个实例中，传输 装置606可以为射频(RF，Radio Frequency)模块，其用于通过无线方式与互联网进行通讯。
本发明实施例所记载的技术方案之间，在不冲突的情况下，可以任意组合。
在本发明所提供的几个实施例中，应该理解到，所揭露的方法和智能设备，可以通过其它的方式实现。以上所描述的设备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，如：多个单元或组件可以结合，或可以集成到另一个系统，或一些特征可以忽略，或不执行。另外，所显示或讨论的各组成部分相互之间的耦合、或直接耦合、或通信连接可以是通过一些接口，设备或单元的间接耦合或通信连接，可以是电性的、机械的或其它形式的。
上述作为分离部件说明的单元可以是、或也可以不是物理上分开的，作为单元显示的部件可以是、或也可以不是物理单元，即可以位于一个地方，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全部单元来实现本实施例方案的目的。
另外，在本发明各实施例中的各功能单元可以全部集成在一个第二处理单元中，也可以是各单元分别单独作为一个单元，也可以两个或两个以上单元集成在一个单元中；上述集成的单元既可以采用硬件的形式实现，也可以采用硬件加软件功能单元的形式实现。
以上所述，仅为本发明的具体实施方式，但本发明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发明揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明的保护范围之内。

Claims (11)

  1. 一种异常频点的检测方法，所述方法包括：
    终端接收到电路域CS寻呼消息时，对多个全球移动通信系统GSM小区的频点进行扫描；
    所述终端基于扫描结果，确定出目标GSM小区的频点，将所述目标GSM小区的频点作为用于通信的目标频点；
    所述终端基于所述目标频点执行位置更新流程，并在执行完所述位置更新流程后开启定时器等待网络下发呼叫控制CC建立消息；
    当在所述定时器超时之前，所述终端未接收到所述网络下发的CC建立消息时，确定所述目标频点为异常频点。
  2. 根据权利要求1所述的异常频点的检测方法，其中，所述终端基于所述目标频点执行位置更新流程，包括：
    所述终端基于所述目标频点，向网络发送位置更新请求消息；
    所述终端接收所述网络返回的位置更新接受消息或者位置更新拒绝消息。
  3. 根据权利要求2所述的异常频点的检测方法，其中，所述在执行完所述位置更新流程后开启定时器等待网络下发呼叫控制CC建立消息，包括：
    所述终端接收到所述网络返回的位置更新接受消息时，开启定时器等待网络下发CC建立消息。
  4. 根据权利要求3所述的异常频点的检测方法，其中，所述定时器为T3240定时器。
  5. 根据权利要求1至4任一项所述的异常频点的检测方法，其中，所述方法还包括：
    对所述异常频点进行标记，并将标记后的异常频点存储至异常频点 数据库中；
    当所述终端再次接收到CS寻呼消息时，基于所述异常频点数据库筛选出待扫描的GSM小区的频点，其中，所述待扫描的GSM小区的频点不包括所述异常频点数据库中的异常频点。
  6. 一种异常频点的检测装置，所述装置包括：
    寻呼单元，配置为接收到CS寻呼消息；
    频点扫描单元，配置为对多个GSM小区的频点进行扫描；
    确定单元，配置为基于扫描结果，确定出目标GSM小区的频点，将所述目标GSM小区的频点作为用于通信的目标频点；
    位置更新单元，配置为基于所述目标频点执行位置更新流程，并在执行完所述位置更新流程后开启定时器等待网络下发CC建立消息；
    异常频点检测单元，配置为当在所述定时器超时之前，所述终端未接收到所述网络下发的CC建立消息时，确定所述目标频点为异常频点。
  7. 根据权利要求6所述的异常频点的检测装置，其中，所述位置更新单元，具体配置为：基于所述目标频点，向网络发送位置更新请求消息；接收所述网络返回的位置更新接受消息或者位置更新拒绝消息。
  8. 根据权利要求7所述的异常频点的检测装置，其中，所述位置更新单元，还配置为接收到所述网络返回的位置更新接受消息时，开启定时器等待网络下发CC建立消息。
  9. 根据权利要求8所述的异常频点的检测装置，其中，所述定时器为T3240定时器。
  10. 根据权利要求6至9任一项所述的异常频点的检测装置，其中，所述装置还包括：
    标记单元，配置为对所述异常频点进行标记，并将标记后的异常频点存储至异常频点数据库中；
    筛选单元，配置为当再次接收到CS寻呼消息时，基于所述异常频点数据库筛选出待扫描的GSM小区的频点，其中，所述待扫描的GSM小区的频点不包括所述异常频点数据库中的异常频点。
  11. 一种计算机存储介质，其上存储有计算机可执行指令，该计算机可执行指令被处理器执行时实现权利要求1-5任一项所述的方法步骤。
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