WO2018153274A1 - Procédé d'établissement d'appel, et dispositif terminal - Google Patents

Procédé d'établissement d'appel, et dispositif terminal Download PDF

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Publication number
WO2018153274A1
WO2018153274A1 PCT/CN2018/075796 CN2018075796W WO2018153274A1 WO 2018153274 A1 WO2018153274 A1 WO 2018153274A1 CN 2018075796 W CN2018075796 W CN 2018075796W WO 2018153274 A1 WO2018153274 A1 WO 2018153274A1
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WO
WIPO (PCT)
Prior art keywords
cell
plmn
emergency call
terminal device
network
Prior art date
Application number
PCT/CN2018/075796
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English (en)
Chinese (zh)
Inventor
袁锴
段小嫣
张博
睢菲菲
丁明
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华为技术有限公司
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Publication of WO2018153274A1 publication Critical patent/WO2018153274A1/fr

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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
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0066—Transmission or use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/50—Connection management for emergency connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/04—Arrangements for maintaining operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment

Definitions

  • the embodiments of the present invention relate to the field of communications technologies, and in particular, to a call setup method and a terminal device.
  • the Long Term Evolution (LTE) system belongs to the fourth generation mobile communication system (English: 4th Generation, 4G for short).
  • the LTE network usually supports faster data rates than 2G and 3G networks.
  • the LTE network may not fully support some services that can be processed by the legacy network, so the deployment of the LTE network and the legacy network usually has overlapping areas, and when the service needs, the terminal equipment can be in the LTE network and the traditional network. Convert between.
  • the LTE network does not support voice calls, so when the terminal device receives or initiates a voice call while connecting to a network that supports the data session but does not support the voice call, the terminal device can perform circuit switching fallback. : Circuit Switched Fallback (CSFB) process to fall back to the traditional network that supports voice calls.
  • CSFB Circuit Switched Fallback
  • GSM Global System for Mobile Communications
  • the embodiment of the invention provides a method for establishing a call to improve the success rate of establishing an emergency call after the terminal device CSFB.
  • an embodiment of the present invention provides a method for establishing a call, where the method is applied to a terminal device, including:
  • the first response message includes a carrier frequency parameter in the second communication network; performing measurement on the first cell, where the first cell includes at least one cell in the second communication network, and a carrier frequency of each cell in the first cell
  • the carrier frequency parameter satisfies the preset relationship; determining whether the second cell supports the emergency call service, where the second cell is a cell in the first cell; when the second cell supports the emergency call service, camping on the second cell;
  • the network device in the second communication network sends a second request message, wherein the second request message is used to request to establish an emergency call.
  • the method further includes: determining, when the second cell does not support the emergency call service, whether the third cell supports the emergency call service, where the third cell is the second cell except the second cell A cell other than that.
  • the carrier frequency parameter includes a carrier frequency, a plurality of carrier frequencies, or a carrier frequency range.
  • the carrier frequency parameter includes a carrier frequency
  • the preset relationship includes the cell frequency and a carrier frequency being the same; when the carrier frequency parameter includes multiple carrier frequencies, the preset relationship includes the cell frequency being one of multiple carrier frequencies; when the carrier frequency
  • the preset relationship includes the cell frequency within a carrier frequency range.
  • determining whether the second cell supports the emergency call service includes: when the system information broadcasted by the second cell broadcasts, the emergency call EC value is 0, or when When the emergency call EC value in the system information of the two cell broadcast is 1 and the access category of the terminal device belongs to the category 11-15, it is determined that the second cell supports the emergency call service; when the system information of the second cell broadcast is allowed When the emergency call EC value is 1, and the access category of the terminal device does not belong to the category 11-15, it is determined that the second cell does not support the emergency call service.
  • the method before camping on the second cell, further includes: determining an ID of the public land mobile network PLMN to which the second cell belongs, and the first PLMN ID or the second PLMN. Whether the ID is the same, when the ID of the PLMN to which the second cell belongs is the same as the first PLMN ID or the second PLMN ID, the step of camping to the second cell is triggered, where the first PLMN ID is the ID of the PLMN currently registered by the terminal device, The second PLMN ID is the ID of the PLMN equivalent to the PLMN currently registered by the terminal device.
  • the method further includes: determining, when the ID of the PLMN to which the second cell belongs, and the first PLMN ID or the second PLMN ID are different, determining whether the second cell is The cell with the strongest received signal power in the cell that meets the preset condition in the first cell, when the second cell is the cell with the strongest received signal power in the cell that meets the preset condition in the first cell, triggers the camp to the first The steps of the two cells.
  • the first communication network is a long term evolution LTE network
  • the second communication network is a global mobile communication system GSM network.
  • an embodiment of the present invention provides a method for establishing a call, where the method is applied to a terminal device, including: sending a first request message to a network device in a first communication network, where the terminal device currently resides in the first communication a cell in the network, the first request message includes emergency call indication information, and a first response message sent by the network device, where the first response message includes a carrier frequency parameter in the second communication system, and the first cell is measured, where A cell includes at least one cell in the second communication network, and a carrier frequency and a carrier frequency parameter of each cell in the first cell satisfy a preset relationship; camping on the second cell, where the second cell is in the first cell a cell that determines whether the second cell supports the emergency call service; and when the second cell does not support the emergency call service, determines whether the third cell supports the emergency call service, where the third cell is other than the second cell in the first cell. a cell; when the third cell supports the emergency call service, reselecting to the third cell; to the
  • the method further includes: determining whether the second cell supports the emergency call service, including: when the system information broadcasted by the second cell, the emergency call EC value is 0, or when the second cell When the emergency call EC value in the broadcast system information is 1 and the access category of the terminal device belongs to the category 11-15, it is determined that the second cell supports the emergency call service; when the emergency call is allowed in the system information broadcasted by the second cell When the EC value is 1, and the access category of the terminal device does not belong to the category 11-15, it is determined that the second cell does not support the emergency call service.
  • the carrier frequency parameter includes a carrier frequency, a plurality of carrier frequencies, or a carrier frequency range.
  • the carrier frequency parameter includes a carrier frequency
  • the preset relationship includes the cell frequency and a carrier frequency being the same; when the carrier frequency parameter includes multiple carrier frequencies, the preset relationship includes the cell frequency being one of multiple carrier frequencies; when the carrier frequency
  • the preset relationship includes the cell frequency within a carrier frequency range.
  • determining whether the second cell supports the emergency call service comprises: determining, according to the saved historical information, whether the second cell supports the emergency call service, where the historical information is the terminal Whether the second cell acquired by the system information broadcasted by the second cell supports the information of the emergency call service when the device is historically camped on the second cell.
  • the method before camping on the second cell, further includes: determining an ID of the public land mobile network PLMN to which the second cell belongs, and the first PLMN ID or the second PLMN. Whether the ID is the same, when the ID of the PLMN to which the second cell belongs is the same as the first PLMN ID or the second PLMN ID, the step of camping to the second cell is triggered, where the first PLMN ID is the ID of the PLMN currently registered by the terminal device, The second PLMN ID is the ID of the PLMN equivalent to the PLMN currently registered by the terminal device.
  • the method further includes: determining, when the ID of the PLMN to which the second cell belongs, and the first PLMN ID or the second PLMN ID are different, determining whether the second cell is The cell with the strongest received signal power in the cell that meets the preset condition in the first cell, when the second cell is the cell with the strongest received signal power in the cell that meets the preset condition in the first cell, triggers the camp to the first The steps of the two cells.
  • the first communication network is a long term evolution LTE network
  • the second communication network is a global mobile communication system GSM network.
  • an embodiment of the present invention provides a terminal device, including: at least one transceiver, configured to: send a first request message to a network device in a first communication network, where the terminal device currently resides in the first a communication network, the first request message includes emergency call indication information; receiving a first response message sent by the network device, where the first response message includes a carrier frequency parameter in the second communication network; and transmitting the first to the network device in the second communication network a request message, wherein the second request message is used to request to establish an emergency call; the processing circuit is coupled to the at least one transceiver, and the processing circuit is configured to control the terminal device to: measure the first cell, where the first cell Include at least one cell in the second communication network, the carrier frequency and the carrier frequency parameter of each cell in the first cell satisfy a preset relationship; determine whether the second cell supports emergency call service, where the second cell is the first cell One of the cells; when the second cell supports the emergency call service, camps on the second cell.
  • the processing circuit is configured to control the terminal device to further determine, when the second cell does not support the emergency call service, whether the third cell supports the emergency call service, where the third cell is the first A cell in one cell other than the second cell.
  • the carrier frequency parameter includes a carrier frequency, a plurality of carrier frequencies, or a carrier frequency range.
  • the carrier frequency parameter includes a carrier frequency
  • the preset relationship includes the cell frequency and a carrier frequency being the same; when the carrier frequency parameter includes multiple carrier frequencies, the preset relationship includes the cell frequency being one of multiple carrier frequencies; when the carrier frequency
  • the preset relationship includes the cell frequency within a carrier frequency range.
  • determining whether the second cell supports the emergency call service includes: when the system information broadcasted by the second cell broadcasts, the emergency call EC value is 0, or when When the emergency call EC value in the system information of the two cell broadcast is 1 and the access category of the terminal device belongs to the category 11-15, it is determined that the second cell supports the emergency call service; when the system information of the second cell broadcast is allowed When the emergency call EC value is 1, and the access category of the terminal device does not belong to the category 11-15, it is determined that the second cell does not support the emergency call service.
  • the processing circuit is configured to control the terminal device to further determine: the ID of the public land mobile network PLMN to which the second cell belongs and the first PLMN ID or the second PLMN Whether the ID is the same, when the ID of the PLMN to which the second cell belongs is the same as the first PLMN ID or the second PLMN ID, the step of camping to the second cell is triggered, where the first PLMN ID is the ID of the PLMN currently registered by the terminal device, The second PLMN ID is the ID of the PLMN equivalent to the PLMN currently registered by the terminal device.
  • the processing circuit is configured to control the terminal device to further: when the ID of the PLMN to which the second cell belongs is not related to the first PLMN ID or the second PLMN ID At the same time, it is determined whether the second cell is the cell with the strongest received signal power in the cell that meets the preset condition in the first cell, and the second cell is the cell with the strongest received signal power in the cell that meets the preset condition in the first cell. At the time, the step of camping to the second cell is triggered.
  • the first communication network is a long term evolution LTE network
  • the second communication network is a global mobile communication system GSM network.
  • an embodiment of the present invention provides a terminal device, including: at least one transceiver, configured to: send a first request message to a network device in a first communication network, where the terminal device currently resides in the first a communication network, the first request message includes emergency call indication information; receiving a first response message sent by the network device, where the first response message includes a carrier frequency parameter in the second communication network; and transmitting the first to the network device in the second communication network a request message, wherein the second request message is used to request to establish an emergency call; the processing circuit is coupled to the at least one transceiver, and the processing circuit is configured to control the terminal device to: measure the first cell, where the first cell Including at least one cell in the second communication network, the carrier frequency and the carrier frequency parameter of each cell in the first cell satisfy a preset relationship; camping on the second cell, where the second cell is one of the first cells a cell; determining whether the second cell supports emergency call service; when the second cell does not support emergency call service The third cell is determined
  • determining whether the second cell supports the emergency call service includes: when the emergency cell call EC value in the system information broadcasted by the second cell is 0, or when the second cell broadcasts system information When the emergency call EC value is 1 and the access class of the terminal device belongs to the category 11-15, it is determined that the second cell supports the emergency call service; when the emergency cell call EC value in the system information broadcasted by the second cell is 1 When the access category of the terminal device does not belong to the category 11-15, it is determined that the second cell does not support the emergency call service.
  • the carrier frequency parameter includes a carrier frequency, a plurality of carrier frequencies, or a carrier frequency range.
  • the carrier frequency parameter includes a carrier frequency
  • the preset relationship includes the cell frequency and a carrier frequency being the same; when the carrier frequency parameter includes multiple carrier frequencies, the preset relationship includes the cell frequency being one of multiple carrier frequencies; when the carrier frequency
  • the preset relationship includes the cell frequency within a carrier frequency range.
  • determining whether the second cell supports the emergency call service comprises: determining, according to the saved historical information, whether the second cell supports the emergency call service, where the historical information is the terminal Whether the second cell acquired by the system information broadcasted by the second cell supports the information of the emergency call service when the device is historically camped on the second cell.
  • the processing circuit is configured to control the terminal device to further determine: the ID of the public land mobile network PLMN to which the second cell belongs and the first PLMN ID or the second PLMN Whether the ID is the same, when the ID of the PLMN to which the second cell belongs is the same as the first PLMN ID or the second PLMN ID, the step of camping to the second cell is triggered, where the first PLMN ID is the ID of the PLMN currently registered by the terminal device, The second PLMN ID is the ID of the PLMN equivalent to the PLMN currently registered by the terminal device.
  • the processing circuit is configured to control the terminal device to further: when the ID of the PLMN to which the second cell belongs is not related to the first PLMN ID or the second PLMN ID At the same time, it is determined whether the second cell is the cell with the strongest received signal power in the cell that meets the preset condition in the first cell, and the second cell is the cell with the strongest received signal power in the cell that meets the preset condition in the first cell. At the time, the step of camping to the second cell is triggered.
  • the first communication network is a long term evolution LTE network
  • the second communication network is a global mobile communication system GSM network.
  • the terminal device determines a cell supporting the emergency call service before determining the camped cell, and then determines the camped cell in the cell supporting the emergency call service, and avoids camping on the cell of the legacy network because of the resident
  • the cell does not support the call setup failure caused by the emergency call service, and improves the success rate of establishing an emergency call in the terminal device CSFB.
  • FIG. 1 is a schematic diagram of network overlay coverage according to an embodiment of the present invention
  • FIG. 2 is a structural diagram of a device of a terminal device according to an embodiment of the present invention.
  • FIG. 3 is a structural diagram of another apparatus of a terminal device according to an embodiment of the present invention.
  • FIG. 4 is a flow chart of a method for establishing a call
  • FIG. 5 is a flowchart of a method for establishing a call according to an embodiment of the present invention.
  • FIG. 6 is a flowchart of another method for establishing a call according to an embodiment of the present invention.
  • FIG. 1 is a schematic diagram of network overlay coverage according to an embodiment of the present invention.
  • FIG. 1 illustrates overlapping coverage of a 4G network 102 and a legacy network 104 in a communication system 100 based on some example embodiments.
  • the 4G network 102 may be, for example, an LTE-based network, such as an LTE network or an LTE-A (LTE-Advanced) network, or capable of providing faster data rates than traditional networks, such as 2G and 3G networks, but does not support or Other networks that fully support voice calls.
  • LTE-based network such as an LTE network or an LTE-A (LTE-Advanced) network
  • LTE-A LTE-Advanced
  • legacy network 104 may be any conventional network that has a CS domain to support CS voice calls.
  • the legacy network 104 may be a 3G network, such as Wideband Code Division Multiple Access (WCDMA), Time Division Synchronous Code Division Multiple (English: Time Division-Synchronous Code Division Multiple).
  • WCDMA Wideband Code Division Multiple Access
  • Time Division Synchronous Code Division Multiple English: Time Division-Synchronous Code Division Multiple
  • TD-SCDMA Code Division Multiple Access 2000 network
  • 1xRTT network
  • 3GPP2 supporting CS domain
  • a legacy network may be a 2G network, such as a GSM network.
  • Both the 4G network 102 and the legacy network 104 may have coverage areas represented by corresponding circles shown in FIG.
  • the coverage areas may overlap, such as shown by the overlapping portion of the circle in FIG.
  • the terminal device can operate on the 4G network 102 and the legacy network 104.
  • the terminal device can connect to the 4G network 102 and can perform a CSFB procedure on the legacy network 104 in response to initiating a voice call.
  • Fig. 2 is a block diagram showing the structure of a terminal device. It should be understood that the components, devices, or components illustrated in FIG. 2 and described below with respect to FIG. 2 may not be necessary, and thus some of them may be omitted in some embodiments. Moreover, some embodiments may include other or different components, devices or elements other than those illustrated in FIG. 2 and described with respect to FIG. 2.
  • terminal device 200 may include processing circuitry 210 that may be configured to perform operations in accordance with one or more of the example embodiments disclosed herein. That is, the processing circuit 210 can be configured to perform and/or control the execution of one or more functions of the terminal device 200 in accordance with various exemplary embodiments, and thus can be provided for executing the terminal device 200 in accordance with various exemplary embodiments.
  • Processing circuitry 210 may be configured to perform data processing, application execution, and/or other processing and management services in accordance with one or more exemplary embodiments.
  • terminal device 200 can include one or more chipsets, each chipset can include one or more chips.
  • processing circuitry 210 and/or one or more other components of terminal device 200 may thus be configured to implement this embodiment on a single chip or chipset.
  • the chipset can enable a computing device to operate in system 200 when implemented on a computing device or operatively coupled to a computing device.
  • one or more components of terminal device 200 can provide a chipset that is configured to enable a computing device to operate on LTE network 102 and/or legacy network 104.
  • processing circuit 210 may include processor 212, and in some embodiments, such as the embodiment shown in FIG. 2, may also include memory 214. Processing circuit 210 can communicate with or otherwise control one or more transceivers 220.
  • Processor 212 can be implemented in a variety of forms.
  • processor 212 can be implemented as various processing devices, such as microprocessors, coprocessors, controllers, or various other computing or processing devices including integrated circuits such as, for example, application specific integrated circuits (ASICs), onsite Programming gate arrays (FPGAs), some combinations of them, and so on.
  • ASICs application specific integrated circuits
  • FPGAs onsite Programming gate arrays
  • processor 212 can include multiple processors.
  • the plurality of processors can operatively communicate with one another and can be collectively configured to perform one or more functions of the terminal device 200 as described herein.
  • processor 212 may be configured to execute instructions that may be stored in memory 214 or otherwise accessible to processor 312.
  • processor 212 is capable of performing operations in accordance with various embodiments when configured accordingly.
  • memory 214 may include one or more memory devices.
  • Memory 214 can include fixed and/or removable memory devices.
  • memory 214 can provide a non-transitory computer readable storage medium that can store computer program instructions executable by processor 212.
  • the memory 214 can be configured to store information, data, applications, instructions, and the like for enabling the terminal device 200 to perform various functions in accordance with one or more exemplary embodiments.
  • memory 314 can communicate with one or more of processor 212, or one or more transceivers 220, via one or more buses for communicating information between components of terminal device 200. .
  • the terminal device 200 may also include one or more transceivers 220.
  • the one or more transceivers 220 can enable the terminal device 200 to transmit and receive signals to and from one or more wireless networks, such as the LTE network 102 and the legacy network 104.
  • the one or more transceivers 220 can be configured to support any type of cellular or other wireless communication technology that can be implemented by the LTE network 102 and/or the legacy network 104.
  • one or more transceivers 220 may include a single transceiver configured to enable terminal device 200 to connect to both LTE network 102 and legacy network 104.
  • the one or more transceivers 220 may include a first transceiver configured to enable the terminal device 200 to connect to the LTE network 102 and configured to enable the terminal device 200 to connect to the legacy A second transceiver of network 104.
  • Fig. 3 is a block diagram showing the structure of another terminal device.
  • the processor 212 further includes: a GSM CM module 2120, a GSM MM module 2121, an LTE module 2122, a GSM PHY module 2123, and a GSM AS module 2124, all of which may be the processor 212.
  • the computer program instructions are executed to implement the method flow in the embodiments of the present invention.
  • Figure 4 is a flow chart showing a method of call setup, including:
  • S401 The terminal device sends an extended service request message (Extended Service Request) to the network device in the first communication network.
  • Extended Service Request Extended Service Request
  • the terminal device residing in the cell in the first communication network when the extended service request message is sent, the extended service request message includes a service type mobile originating CS fallback emergency call, and the extended service request message may be used by the terminal device
  • the LTE module transmits to the network device in the first communication network.
  • the first communication network may be an LTE network.
  • the network device in the first communications network sends a radio resource control connection release message (RRC Connection Release) to the terminal device.
  • RRC Connection Release radio resource control connection release message
  • the carrier frequency parameter can include a carrier frequency, a plurality of carrier frequencies, or a carrier frequency range.
  • the carrier frequency parameter is a GERAN (English: GSM EDGE Radio Access Network) carrier frequency parameter
  • the second communication network may be a GSM network.
  • the LTE module of the terminal device sends a redirection instruction (ID_LRRC_GRR_REDIRECTED_REQ) to the GSM access layer (English: Access Stratum, AS for short) module of the terminal device;
  • the redirecting command includes a carrier frequency parameter received from the network device, the redirecting instruction being used to indicate that the GSM AS module of the terminal device is redirected to the GSM network.
  • the GSM AS module of the terminal device sends a measurement instruction (EVT_MPH_RXLEV_REQ) to the GSM physical layer (English: Physical Layer, PHY for short) module of the terminal device;
  • the measurement command includes a carrier frequency parameter in the redirect command, and a preset threshold, the measurement command is used to instruct the GSM PHY module to perform measurement on the GSM cell.
  • the GSM PHY module of the terminal device performs measurement on at least one GSM cell.
  • the GSM PHY module measures at least one GSM cell in which a cell carrier frequency (hereinafter referred to as a cell frequency) and a carrier frequency parameter satisfy a preset relationship.
  • a cell carrier frequency hereinafter referred to as a cell frequency
  • the preset relationship includes the cell frequency and the carrier frequency being the same; when the carrier frequency parameter includes multiple carrier frequencies, the preset relationship includes the cell frequency being one of the multiple carrier frequencies;
  • the carrier frequency parameter includes a carrier frequency range, the preset relationship includes the cell frequency being within the carrier frequency range.
  • the GSM PHY module may be based on the pre-configured GERAN carrier frequency in the terminal device, if no GSM cell is measured on the carrier frequency in which the carrier frequency parameter in step S404 satisfies the preset relationship.
  • the information is measured by the GSM cell, or the GSM cell is measured according to the historical GERAN carrier frequency information stored in the terminal device, to obtain the GSM cell information that meets the preset condition.
  • the GSM PHY module of the terminal device sends the information of the GSM cell that meets the preset condition to the GSM AS module of the terminal device after the measurement;
  • the preset condition includes: the cell received signal power is greater than or equal to a preset threshold sent by the GSM AS module to the GSM PHY module in S404.
  • the GSM AS module of the terminal device determines a camping cell from the GSM cell that is sent by the GSM PHY module and meets the preset condition.
  • the GSM AS module determines the camping cell by the following method:
  • the GSM AS module sequentially determines whether the GSM cell that meets the preset condition is a suitable cell (Suitable Cell);
  • the GSM AS module directly determines whether the GSM cell is a suitable cell. Specifically, the GSM AS module determines the ID of the PLMN to which the GSM cell belongs and the ID of the PLMN currently registered by the terminal device according to the information sent by the GSM PHY module. Or whether the ID of the equivalent PLMN is the same, if the same, the GSM cell is determined to be a suitable cell, and the GSM cell is used as a camping cell; if not, the GSM cell is determined to be an acceptable cell. The equivalent PLMN and the PLMN currently registered by the terminal device belong to the same operator.
  • the GSM AS module determines one by one according to the above method, and then selects any one of the determined suitable cells or selects the cell with the strongest received signal power as the camping cell.
  • the GSM AS module selects any one of the acceptable cells or selects the cell with the strongest received signal power as the camping cell.
  • the reason why the suitable cell is preferentially selected as the camping cell is because the terminal device can only make an emergency call in the acceptable cell, and cannot perform other services after the emergency call.
  • the GSM AS module of the terminal device sends a cell resident instruction (ID_MPH_CAMP_SCELL_REQ) to the GSM PHY module to instruct the GSM PHY module to control the terminal device to camp on the selected cell;
  • ID_MPH_CAMP_SCELL_REQ a cell resident instruction
  • the GSM PHY module sends a cell camp confirmation (ID_MPH_CAMP_SCELL_CNF) to the GSM AS module.
  • the GSM AS module sends a redirect acknowledgment (ID_LRRC_GRR_REDIRECTED_CNF) to the LTE module.
  • the GSM AS module sends a cell information indication (GRRMM_SYS_INFO_IND) to the GSM mobility management (English: Mobility Management, MM for short) module of the terminal device;
  • the cell information indication includes information of the camped cell, and the information of the camped cell includes the Access-Restriction-Emergency-Service.
  • S412 The GSM connection management (English: Connection Management, CM for short) module of the terminal device sends a connection management service request instruction (ID_NAS_CM_SERV_REQUEST) to the GSM MM module;
  • the connection management service request command includes an emergency-call-establishment for requesting establishment of an emergency call.
  • the GSM MM module sends a radio resource connection establishment request instruction (RRMM_EST_REQ) to the GSM AS module.
  • RRMM_EST_REQ radio resource connection establishment request instruction
  • the radio resource connection setup request command includes an emergency-call-establishment for requesting establishment of an emergency call.
  • the GSM AS module sends a radio resource connection establishment confirmation (RRMM_EST_CNF) to the GSM MM module.
  • RRMM_EST_CNF radio resource connection establishment confirmation
  • the GSM MM module sends a radio resource and mobility management termination session notification instruction (RRMM_END_SESSION_NOTIFY) to the GSM AS module.
  • RRMM_END_SESSION_NOTIFY radio resource and mobility management termination session notification instruction
  • the radio resource and mobility management termination session notification instruction is used to instruct the terminal device to terminate the session. From the perspective of the user experience, the terminal device directly hangs up the call, resulting in dropped calls.
  • FIG. 5 is a method for establishing a call according to an embodiment of the present invention. As shown in the figure, S501-S502 in FIG. 5 and S401-S402, S504-S506 and FIG. 4 in FIG. S404-S406 in the embodiment is the same, the difference is:
  • the LTE module of the terminal device sends a redirection instruction (ID_LRRC_GRR_REDIRECTED_REQ) to the GSM access layer module of the terminal device;
  • the redirecting instruction includes, in addition to the carrier frequency parameter received from the network device, an emergency call indication, such as a CS emergency call indication, indicating that the type of service to be performed is an emergency call.
  • an emergency call indication such as a CS emergency call indication
  • the GSM AS module After the GSM PHY module of the terminal device transmits the information of the GSM cell that meets the preset condition to the GSM AS module of the terminal device, the GSM AS module does not immediately determine a camping cell from the GSM cell that meets the preset condition.
  • the GSM cell that satisfies the preset condition is firstly determined to support the emergency call service (the embodiment of the present invention does not limit the judgment order).
  • the GSM AS module determines whether one of the GSM cells that meets the preset condition supports the emergency call service, and the determining method includes but is not limited to:
  • the GSM AS module determines whether the current GSM cell supports the emergency call service according to the received system information of the current GSM cell broadcast.
  • the GSM AS module reads the "allow emergency call" in the random access channel control parameter (RACH Control Parameters) in the system information category (SYSTEM INFORMATION TYPE) 1, 2, 2bis, 3, or 4 of the current GSM cell broadcast.
  • RACH Control Parameters random access channel control parameter
  • SYSTEM INFORMATION TYPE system information category
  • EC Errgency Call allowed
  • the access category 15 is a PLMN staff, which is not described in the embodiment of the present invention.
  • the GSM AS module proceeds to perform S508a, that is, determines the camped cell.
  • the GSM AS module determines whether the current GSM cell is a suitable cell. For example, the GSM AS module determines whether the ID of the PLMN to which the current GSM cell belongs and the ID of the PLMN currently registered by the terminal device or the ID of the equivalent PLMN are the same according to the information sent by the GSM PHY module. If they are the same, the GSM cell is determined to be a suitable cell. And the GSM cell is used as a camping cell; if different, the GSM cell is determined to be an acceptable cell.
  • the equivalent PLMN and the PLMN currently registered by the terminal device belong to the same operator.
  • the GSM AS module determines that the current GSM cell is a suitable cell, the current GSM cell can be determined as a camping cell.
  • the GSM AS module determines that the current GSM cell is an acceptable cell, the GSM AS module continues to execute S508b, that is, the judgment is performed. Whether a GSM cell supports emergency call services. When there is no suitable cell in the GSM cell that meets the preset condition and supports the emergency call service, or is an acceptable cell, the GSM AS module selects one of them or the one with the strongest received signal power as the camping cell.
  • the GSM AS module continues to perform S508b, that is, whether the next GSM cell supports the emergency call service. If none of the GSM cells satisfying the preset condition supports the emergency call service, S504-S507 is re-executed.
  • the GSM AS module when determining that the current GSM cell supports the emergency call service, omits the step of determining whether the current GSM cell is a suitable cell, and directly determines the current GSM cell as the camped cell.
  • the terminal device does not need to read the system information of the current GSM cell to obtain the PLMN ID of the current GSM cell, which can save the time for determining the camped cell and speed up the camping speed.
  • CM Service Request connection management service request
  • the terminal device determines a cell supporting the emergency call service before determining the camped cell, and then determines the camped cell in the cell supporting the emergency call service, and avoids camping on the cell of the legacy network because of the resident
  • the cell does not support the call setup failure caused by the emergency call service, and improves the success rate of establishing an emergency call in the terminal device CSFB.
  • FIG. 6 is another method for establishing a call according to an embodiment of the present invention.
  • S601-S613 in FIG. 6 is the same as S401-S413 in FIG. 4 and its corresponding embodiment, except that, as shown in FIG.
  • the GSM AS module of the terminal device determines whether the current camped cell supports the emergency call service.
  • the GSM AS module can determine whether the current camped cell supports emergency call services in the following two ways:
  • the GSM AS module determines whether the current camped cell supports the emergency call service according to the received system information of the currently camped cell.
  • the GSM AS module reads "Allow emergency calls" in the random access channel control parameters (RACH Control Parameters) in the system information category (SYSTEM INFORMATION TYPE) 1, 2, 2bis, 3, or 4 of the currently camped cell broadcast ( English: The value of the Emergency Call allowed (EC) field.
  • RACH Control Parameters random access channel control parameters
  • SYSTEM INFORMATION TYPE system information category
  • SYSTEM INFORMATION TYPE system information category
  • SYSTEM INFORMATION TYPE system information category
  • SYSTEM INFORMATION TYPE system information category
  • SYSTEM INFORMATION TYPE system information category
  • SYSTEM INFORMATION TYPE system information category
  • EC Emergency Call allowed
  • the current station can be judged by checking the information. Whether the staying cell supports emergency call services.
  • the GSM AS module determines a new camped cell.
  • the GSM AS module may determine a new resident in the GSM cell that meets the preset condition acquired in S606, or by re-executing the new GSM cell that satisfies the preset condition acquired by S604-S606, by the method as described in S508a. Leave the cell and perform the next steps:
  • the GSM AS module of the terminal device sends a cell resident instruction to the GSM PHY module to instruct the GSM PHY module to control the terminal device to camp on the selected cell;
  • the GSM PHY module sends a cell resident confirmation to the GSM AS module.
  • the GSM AS module of the terminal device sends a radio resource connection establishment confirmation to the GSM MM module, where the establishment result is the establishment success information, and is used to indicate that the radio resource connection is successfully established for the emergency call in the current camping cell;
  • the GSM MM module sends a connection management service request to the network device in the GSM network to request to establish an emergency call.
  • the subsequent UE successfully establishes an emergency call on the GSM network.
  • the terminal device determines whether the current camped cell supports the emergency call service, and when it finds that the current camped cell does not support the emergency call service, re-determines a new resident that supports the emergency call service.
  • the cell improves the success rate of establishing an emergency call in the terminal device CSFB.
  • the terminal device 200 shown in FIG. 2 or FIG. 3 can perform the call setup method shown in FIG. 5, including:
  • At least one transceiver 220 is configured to:
  • Processing circuit 212 coupled to at least one transceiver 220, is configured to control the terminal device to:
  • the first cell is measured, wherein the first cell includes at least one cell in the second communication network and a cell whose carrier frequency parameter satisfies a preset relationship; optionally, the step is performed by the GSM PHY module 2123 in the processor 212. ;
  • Determining whether the second cell supports emergency call service where the second cell is a cell in the first cell; optionally, the step is performed by the GSM AS module 2124 in the processor 212;
  • the second cell When the second cell supports the emergency call service, it camps on the second cell.
  • processing circuit 212 is configured to control the terminal device to further:
  • the third cell supports the emergency call service, where the third cell is a cell other than the second cell in the first cell.
  • this step is performed by GSM AS module 2124 in processor 212.
  • determining whether the second cell supports the emergency call service includes:
  • the emergency call EC value in the system information broadcasted by the second cell is 1 and the access category of the terminal device does not belong to the category 11-15, it is determined that the second cell does not support the emergency call service.
  • this step is performed by GSM AS module 2124 in processor 212.
  • processing circuit 212 is configured to control the terminal device to further:
  • the camp is triggered to The step of the second cell, where the first PLMN ID is the ID of the PLMN currently registered by the terminal device, and the second PLMN ID is the ID of the PLMN equivalent to the PLMN currently registered by the terminal device.
  • this step is performed by GSM AS module 2124 in processor 212.
  • processing circuit 212 is configured to control the terminal device to further:
  • the step of camping on the second cell is triggered.
  • this step is performed by GSM AS module 2124 in processor 212.
  • the first communication network is a long term evolution LTE network
  • the second communication network is a global mobile communication system GSM network.
  • the terminal device 200 shown in FIG. 2 or FIG. 3 can also perform the call setup method shown in FIG. 6, including:
  • At least one transceiver 220 is configured to:
  • Processing circuit 212 coupled to at least one transceiver 220, is configured to control the terminal device to:
  • the first cell is measured, wherein the first cell includes at least one cell in the second communication network and a cell whose carrier frequency parameter satisfies a preset relationship; optionally, the step is performed by the GSM PHY module 2123 in the processor 212. ;
  • Determining whether the second cell supports emergency call service optionally, the step is performed by the GSM AS module 2124 in the processor 212;
  • the second cell When the second cell does not support the emergency call service, it is determined whether the third cell supports the emergency call service, where the third cell is a cell other than the second cell in the first cell; optionally, the step is performed by the processor 212.
  • GSM AS module 2124 is executed;
  • the third cell When the third cell supports the emergency call service, the third cell is reselected.
  • determining whether the second cell supports the emergency call service includes:
  • the emergency call EC value in the system information broadcasted by the second cell is 1 and the access category of the terminal device does not belong to the category 11-15, it is determined that the second cell does not support the emergency call service.
  • this step is performed by GSM AS module 2124 in processor 212.
  • determining whether the second cell supports the emergency call service includes:
  • this step is performed by GSM AS module 2124 in processor 212.
  • processing circuit 212 is configured to control the terminal device to further:
  • the camp is triggered to The step of the second cell, where the first PLMN ID is the ID of the PLMN currently registered by the terminal device, and the second PLMN ID is the ID of the PLMN equivalent to the PLMN currently registered by the terminal device.
  • this step is performed by GSM AS module 2124 in processor 212.
  • processing circuit 212 is configured to control the terminal device to further:
  • the step of camping on the second cell is triggered.
  • this step is performed by GSM AS module 2124 in processor 212.
  • the first communication network is a long term evolution LTE network
  • the second communication network is a global mobile communication system GSM network.
  • the computer program product includes one or more computer instructions.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • the computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transfer to another website site, computer, server, or data center by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL), or wireless (eg, infrared, wireless, microwave, etc.).
  • the computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media.
  • the usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (such as a solid state disk (SSD)).

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Business, Economics & Management (AREA)
  • Health & Medical Sciences (AREA)
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Abstract

L'invention concerne un procédé d'établissement d'appel applicable à un dispositif terminal, et un dispositif terminal correspondant. Le procédé consiste à : envoyer un premier message de demande à un dispositif de réseau d'un premier réseau de communication, le dispositif terminal résidant actuellement dans une cellule du premier réseau de communication, le premier message de demande contenant des informations d'indication d'appel d'urgence ; recevoir un premier message de réponse envoyé par le dispositif de réseau, le premier message de réponse contenant le paramètre de fréquence porteuse d'un second réseau de communication ; mesurer des premières cellules, les premières cellules comprenant au moins une cellule du second réseau de communication, la fréquence porteuse et le paramètre de fréquence porteuse de chaque cellule des premières cellules satisfaisant tous les deux des relations prédéfinies ; déterminer si une seconde cellule prend en charge un service d'appel d'urgence, la seconde cellule étant une cellule des premières cellules ; lorsque la seconde cellule prend en charge le service d'appel d'urgence, résider dans la seconde cellule ; envoyer un second message de demande au dispositif de réseau du second réseau de communication, le second message de demande étant utilisé pour demander l'établissement d'un appel d'urgence.
PCT/CN2018/075796 2017-02-27 2018-02-08 Procédé d'établissement d'appel, et dispositif terminal WO2018153274A1 (fr)

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CN112153757B (zh) * 2019-06-29 2023-03-10 华为技术有限公司 通信方法、装置和系统
CN112788582A (zh) * 2020-12-31 2021-05-11 展讯通信（上海）有限公司 一种紧急呼叫方法及其装置
CN113613232B (zh) * 2021-07-02 2022-07-22 青岛海信移动通信技术股份有限公司 一种紧急呼叫的方法及装置
CN117730553A (zh) * 2021-11-01 2024-03-19 Oppo广东移动通信有限公司 受限服务的处理方法、终端设备和网络设备
CN113973272B (zh) * 2021-12-16 2022-05-03 荣耀终端有限公司 紧急呼叫的方法、设备和存储介质
CN114401537B (zh) * 2022-03-24 2022-08-19 荣耀终端有限公司 一种网络重定向方法、装置和用户设备

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