WO2018082039A1 - 一种信令传输的方法、装置及系统 - Google Patents

一种信令传输的方法、装置及系统 Download PDF

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Publication number
WO2018082039A1
WO2018082039A1 PCT/CN2016/104702 CN2016104702W WO2018082039A1 WO 2018082039 A1 WO2018082039 A1 WO 2018082039A1 CN 2016104702 W CN2016104702 W CN 2016104702W WO 2018082039 A1 WO2018082039 A1 WO 2018082039A1
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Prior art keywords
terminal device
indication information
network device
message
radio access
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PCT/CN2016/104702
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English (en)
French (fr)
Inventor
李秉肇
权威
张戬
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华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201680090323.1A priority Critical patent/CN109845330A/zh
Priority to PCT/CN2016/104702 priority patent/WO2018082039A1/zh
Publication of WO2018082039A1 publication Critical patent/WO2018082039A1/zh

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    • 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

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a signaling transmission method, apparatus, and system.
  • the precondition for using CSFB technology is: evolved universal terrestrial radio access network (E-UTRA and UMTS terrestrial radio access network (UTRAN)/GSM/EDGE radio connection
  • GERAN GSM/EDGE radio access network
  • the CS indication information sent by the core network device to the terminal device by using the wireless access network device is used to notify the terminal device to provide the voice service by using the CSFB solution.
  • the converted network is not notified to the core network device. That is, regardless of whether the terminal device is currently in the connected state or the lightly connected state, the core network directly directly transmits the non-access stratum signaling for the terminal device. Send to the wireless access network device.
  • the radio access network device Since the radio access network device does not parse the non-access stratum signaling, that is, the radio radio access network device does not know that the non-access stratum signaling is for the CSFB service, the radio access network device receives After the non-access stratum signaling, the paging process is required to notify the terminal to perform connection recovery. After the terminal device performs connection recovery, the radio access network device sends the signaling to the terminal device. However, it takes a certain time for the terminal device to perform connection recovery, which causes a problem of call delay in the terminal device using the CSFB scheme.
  • This paper describes a signaling transmission method, device and system for improving the efficiency of terminal equipment using CSFB scheme for voice communication.
  • an embodiment of the present application provides a signaling transmission method, where the method includes: receiving, by a radio access network device, a non-access stratum NAS message sent by a core network device, and first indication information, according to a current state of the terminal device. Determining and transmitting the second indication information to the terminal device.
  • the second indication information includes a NAS message or a first indication information paging message.
  • the first indication information can be used to notify the terminal device that there is a service request from the circuit switched CS domain.
  • the radio access network device may determine the indication information according to the state of the current terminal device and send the indication information to the terminal device, where the indication information may be used to notify the terminal device that there is a circuit switched CS domain.
  • the service request prevents the terminal device from performing the connection recovery process before receiving the indication information, thereby improving the efficiency of the CSFB service request process.
  • the radio access network device receives the NAS signaling transmission message that is sent by the core network device and carries the NAS message and the first indication information. Therefore, the core network does not need an additional message to notify the radio access network device of the first indication information and the NAS message, thereby achieving the purpose of saving signaling.
  • the NAS signaling transmission message further carries an identifier type of the terminal device, and is used to indicate an identifier of the terminal device used by the terminal device to perform paging.
  • the terminal device determines that the CS domain device uses the terminal identifier corresponding to the type identifier to page the terminal device, and in subsequent processing, the terminal can use the terminal identifier corresponding to the type identifier to communicate with the CS domain device.
  • the method further includes: the access network device sending a notification to the core network device The information is used to notify the core network device that the terminal device is currently in a lightly connected state or a connected state.
  • the radio access network device determines that the second indication information sent to the terminal device includes a NAS message.
  • the radio access network device can determine the content of the sent indication information according to the current state of the terminal device, and quickly notify the terminal device to perform the subsequent CSFB service flow.
  • the wireless access network device determines that the second indication information sent to the terminal device includes A paging message with first indication information.
  • the radio access network device can determine the content of the sent indication information according to the current state of the terminal device, and quickly notify the terminal device to perform the subsequent CSFB service flow.
  • the paging message when the current state of the terminal device is a light connection state, the paging message further carries a type identifier of the terminal device, where the type identifier is used to indicate that the identifier used by the terminal device to perform paging is Temporary Mobile Station Identity TMSI or International Mobile Subscriber Identity IMSI.
  • an embodiment of the present application provides a signaling transmission method, including: receiving, by a terminal device, second indication information sent by a radio access network device, where the terminal device determines, according to the second indication information, an originating service request procedure.
  • the second indication information is sent by the radio access network device according to a current state of the terminal device, where the second indication information includes a non-access stratum NAS message or first indication information, where the first indication is The information is used to inform the terminal device that there is a service request from the circuit switched CS domain.
  • the terminal device if the terminal device is currently in the connected state, the terminal device receives the second indication information sent by the radio access network device, including the NAS message.
  • the terminal device receives the second indication information sent by the radio access network device, and includes a paging message that carries the first indication information.
  • the terminal device determines the end in the paging message
  • the end identifier is the same as the identifier of the terminal device itself, and the terminal device determines the originating service request procedure according to the CS domain indication information in the paging message.
  • the second indication information further carries a type identifier of the terminal device, and is used to indicate an identifier of the terminal device used by the terminal device to perform paging.
  • the method further includes: the core network device receiving the radio access network A notification message sent by the device, the notification message is used to notify the terminal device that the device is currently in a connected state or a lightly connected state.
  • the core network device can learn the current state of the terminal device more quickly, thereby further promoting the process of the terminal device adopting the CSFB scheme for voice call, thereby improving the efficiency of making a voice call.
  • the NAS message is a CS service notification message.
  • the embodiment of the present invention provides a radio access network device, where the radio access network device has the function of implementing the behavior of the radio access network device in the foregoing method, and the function may be implemented by using hardware or The hardware executes a corresponding software implementation that includes one or more modules corresponding to the functions described above.
  • the radio access network device includes a receiver, a processor, and a transmitter configured to support the radio access network device to perform respective functions in the methods described above.
  • the transmitter is configured to support communication between the radio access network device and the terminal device, and send the second indication information determined by the processor to the terminal device.
  • the radio access network device can also include a memory for coupling with the processor that stores the necessary program instructions and data for the base station.
  • the structure of the terminal device includes a receiver and a processor configured to support the terminal device to receive the second information determined and transmitted by the wireless access network device.
  • the processor controls the terminal device to determine an originating service request procedure according to the second indication information.
  • an embodiment of the present invention provides a core network device, where the core network device has a function of implementing behavior of a core network device in the foregoing method design, and the function may be implemented by using hardware, or may execute corresponding software through hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • an embodiment of the present invention provides a signaling transmission system, where the system includes the radio access network device, the terminal device, and the core network device.
  • an embodiment of the present invention provides a computer storage medium for storing computer software instructions for use in the wireless access network device, including a program designed to perform the above aspects.
  • an embodiment of the present invention provides a computer storage medium for storing Computer software instructions for use with the terminal devices described above, including programs designed to perform the above aspects.
  • an embodiment of the present invention provides a computer storage medium for storing computer software instructions for use in the core network device, including a program designed to perform the above aspects.
  • the solution provided by the present invention can receive the notification from the CS domain service request more quickly, thereby improving the efficiency of subsequent CSFB scheme for voice communication.
  • FIG. 1 is a schematic flowchart of data transmission of a terminal device in a lightly connected state in the prior art
  • FIG. 2 is a schematic diagram of communication in a state in which a radio access network device controls a terminal device in a connection state and a light connection state in the prior art;
  • FIG. 3 is a schematic flowchart of a radio access network device in a signaling transmission method according to an embodiment of the present disclosure
  • FIG. 4 is a schematic flowchart of a terminal device in another signaling transmission method according to an embodiment of the present disclosure
  • FIG. 6 is a schematic flowchart diagram of another signaling transmission method according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of a radio access network device according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic structural diagram of a core network device according to an embodiment of the present invention.
  • the communication system used in the embodiments of the present invention may be a Global System of Mobile communication (GSM) system, a Code Division Multiple Access (CDMA) system, or a Wideband Code Division Multiple Access (Wideband Code Division Multiple). Access, WCDMA) System, General Packet Radio Service (GPRS), Long Term Evolution (LTE) System, LTE Frequency Division Duplex (FDD) System, LTE Time Division Duplex (Time) Division Duplex (TDD), Universal Mobile Telecommunication System (UMTS), and other wireless communication systems using orthogonal frequency division (OFDM) technology.
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • Wideband Code Division Multiple Wideband Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • TDD Time Division Duplex
  • UMTS Universal Mobile Telecommunication System
  • OFDM orthogonal frequency division
  • the radio access network device involved in the embodiment of the present invention may be used as a terminal device. Provide wireless communication capabilities.
  • the radio access network device may include various forms of macro base stations, micro base stations (also referred to as small stations), relay stations, access points, and the like.
  • the radio access network device may be a base station (Base T access network station, BTS) in GSM or CDMA, a base station (NodeB, NB) in WCDMA, or an evolved base station in LTE (Evolutional Node B, eNB or e-NodeB), and may be the corresponding device gNB in the 5G network.
  • BTS Base T access network station
  • NodeB, NB base station
  • LTE Evolutional Node B, eNB or e-NodeB
  • the foregoing apparatus for providing a wireless communication function for a terminal device is collectively referred to as a radio access network device.
  • the terminal device may also be referred to as a user equipment (User Equipment, UE), a mobile station (Mobile Station, MS), a mobile terminal (Mobile Terminal), etc., and the terminal device may be through a radio access network.
  • Radio Access Network, RAN communicates with one or more core networks, for example, the terminal device may be a mobile phone (or "cellular" phone), a computer with a mobile terminal, etc., for example, the terminal device may also be portable , pocket, handheld, computer built-in or in-vehicle mobile devices that exchange language and/or data with the wireless access network.
  • the embodiment of the invention is not specifically limited.
  • the core network device controls one or more radio access network devices, and may uniformly allocate resources in the system, and may also allocate resources to the terminal device.
  • the radio access network device may be a Node B and an RNC in a UMTS system, and the core network device may be an SGSN and a GGSN.
  • the radio access network device may be an eNB in an LTE system, and the core network device may be an MME.
  • the core network device may be a wireless network straddle-type cooperative controller or the like, which is not specifically limited in the embodiment of the present invention.
  • the terminal device can enter the light connection state under the indication of the first Radio Access Network (RAN) device.
  • the light connection state is a state between a Radio Resource Control (RRC) connected state and an idle (Idle) state.
  • RRC Radio Resource Control
  • Idle idle
  • the terminal device entering the light connection state releases the RRC connection, but saves the connection information with the first radio access network device.
  • the first radio access network device allocates a context identifier to the terminal device.
  • FIG. 1 is a mobile scenario of a terminal device in a lightly connected state, and three mobile access network devices are involved in the mobile scenario.
  • the first radio access network device may indicate that the terminal device enters a light connection state, and allocate a context identifier to the terminal device.
  • the context information of the terminal device is stored in the first radio access network device, and the context information includes connection configuration parameters between the first radio access network device and the terminal device.
  • the terminal device can move freely in the paging area 1 without notifying the first radio access network device, and each paging area can include a set of cells managed by one or more radio access network devices. In this scenario, the terminal device 1 and the first radio access network device are in the same paging area 1.
  • the saved terminal information can be used to restore the terminal device 1 and the first wireless device.
  • the RRC connection between the access network devices avoids the signaling load during the RRC connection reestablishment process.
  • the light connection state described herein is a terminal device state defined by the present invention, including that the core network interface of the terminal device is stored in a radio access network device, and the terminal device can perform cell-based reselection. Mobility.
  • the light connection state may be a sub-state of the connected state or an enhanced state of the idle state, and may also be called an inactive state, a deactivated state, a low-overhead state or other names, which is not limited by the present invention.
  • the light connection state of the terminal device may be an idle state, and the terminal device saves the connection context. When the terminal device clears the connection context, it enters a normal idle state.
  • the light connection state may be the state of the connected device and allowed to perform mobility management (eg, cell reselection). When the terminal device stops performing mobility management in the light connection state, it can enter the normal connection state.
  • the radio access network device when the radio access network device controls the transition between the connected state and the lightly connected state, the radio access network device does not notify the core network device, so whether the terminal device is in the connected state or is light In the connection state, the core network device sends the NAS transmission message including the CS service notification message to the radio access network device, and after receiving the NAS transmission message, the radio access network device needs to send the NAS message included therein.
  • the radio access network device since the specific location of the terminal device is unknown, the paging process can only be initiated. After the terminal device performs the connection recovery process, the radio access network device can send the NAS message to the terminal device through the restored connection, and then the terminal device.
  • the CSFB solution can be used to provide voice services.
  • the CSFB scheme can be used for the voice service, which requires a certain time, causing the terminal device using the CSFB scheme to make a call delay for the voice call. problem.
  • a signaling transmission method provided by an embodiment of the present invention, after receiving a NAS signaling transmission message sent by a core network device by using a radio access network device, determining, according to a state of the current terminal device, transmitting to the terminal device
  • the indication information enables the terminal device to quickly receive the CS indication information without performing the connection recovery process, thereby improving the efficiency of using the CSFB scheme for voice calls.
  • FIG. 3 is a signaling transmission method according to an embodiment of the present invention, including:
  • the radio access network device receives the non-access stratum NAS message and the first indication information sent by the core network device, where the first indication information is used to notify the terminal device that the service request is from the circuit switched CS domain.
  • the first indication information may include CS domain indication information, indicating that the NAS message is from a CS domain.
  • the first indication information may include a NAS identifier of the terminal device, where the paging identifier type of the terminal device is used to indicate a temporary mobile subscriber identity (TMSI) or an international mobile subscriber identifier (International mobile subscriber). Identity, IMSI).
  • TMSI temporary mobile subscriber identity
  • IMSI international mobile subscriber identifier
  • the first indication information may include a CS domain indication and a terminal device identification type, where the CS domain indication is used to indicate that the NAS message is from the CS domain, and the terminal device identity type is used to indicate the paging identity type of the terminal device.
  • the terminal device identification can be a bit, such as 00 or 01, where 00 represents TMSI, 01 represents IMSI, and vice versa.
  • the identity type information of the terminal device may be TMSI or IMSI.
  • the foregoing description of the identifier of the terminal device is only for the purpose of better understanding the solution of the present invention.
  • the present invention includes, but is not limited to, the type of paging identifier of the terminal device as long as it is identification information, and belongs to the present invention. The scope protected by the examples.
  • the NAS message may be a CS service notification message, and is used to notify the terminal device that there is a CS service request that needs to be processed.
  • the radio access network device receives the NAS message and the first indication information that are sent by the core network device by using the NAS signaling transmission message.
  • the NAS signaling transmission message may further carry an identifier type of the terminal device, and is used to indicate an identifier of the terminal device used by the terminal device to perform paging.
  • the radio access network device determines, according to a current state of the terminal device, second indication information that is sent to the terminal device, where the second indication information includes a NAS message or a paging message that carries the first indication information.
  • the radio access network device determines that the second indication information sent to the terminal device includes a NAS message.
  • the radio access network device determines that the second indication information that is sent to the terminal device includes a paging message that carries the first indication information.
  • the paging message when the current state of the terminal device is the light connection state, the paging message further carries a type identifier of the terminal device, where the type identifier is used to indicate that the identifier used by the terminal device to perform paging is TMSI or IMSI.
  • the radio access network device sends the second indication information to the terminal device.
  • the radio access network device does not know the specific location of the terminal device, the paging process can only be initiated. After receiving the paging message, the terminal device performs connection recovery, and receives the indication information of the CS domain on the restored connection. When the terminal device uses the connection recovery process to perform connection recovery, it takes a certain time, causing the terminal device to use the CSFB scheme to perform voice call delay.
  • the radio access network device determines the indication information sent to the terminal device according to the current state of the terminal device, and does not need to perform connection recovery before receiving the indication information. Process, the terminal device can receive the CS indication information more quickly, and improve the The efficiency of voice communication using the CSFB scheme.
  • the embodiment shown in FIG. 3 may further include:
  • the access network device sends a notification message to the core network device, where the notification information is used to notify the core network device that the terminal device is currently in a lightly connected state or a connected state.
  • the core network device can learn the state of the terminal device more quickly and prepare for the subsequent process.
  • FIG. 4 is another signaling transmission method according to an embodiment of the present invention, including:
  • the terminal device receives the second indication information that is sent by the radio access network device, where the second indication information is sent by the radio access network device according to a current state of the terminal device, where the second indication information includes a non-access stratum.
  • the NAS message or the first indication information, the first indication information is used to notify the terminal device that there is a service request from the circuit switched CS domain.
  • the terminal device receives the second indication information sent by the radio access network device, including the NAS message.
  • the NAS message can be a CS service notification message.
  • the terminal device receives the second indication information that is sent by the radio access network device, and includes the paging message that carries the first indication information.
  • the second indication information further carries a type identifier of the terminal device, and is used to indicate an identifier of the terminal device used by the terminal device to perform paging.
  • Terminal device determines CS When the domain device uses the terminal device identifier corresponding to the terminal device type identifier to page the terminal device, the terminal device communicates with the CS domain device by using the terminal identifier corresponding to the terminal device type identifier in a subsequent process.
  • the terminal device determines, according to the second indication information, a process of initiating a service request.
  • the terminal device determines that the terminal identifier in the paging message is the same as the identifier of the terminal device, the terminal device The originating service request procedure is determined according to the CS domain indication information in the paging message.
  • the terminal device determines, according to the CS service notification message included in the NAS message, the originating service request procedure.
  • the core network device receives the paging request.
  • the core network device generates a non-access stratum NAS message and first indication information according to the paging request, where the first indication information is used to notify the terminal device that there is a service request from the circuit-switched CS domain network.
  • the core network device sends a NAS signaling transmission to the radio access network device.
  • the NAS signaling transmission message carries the NAS message and the first indication information.
  • the NAS message may be a CS service notification message.
  • the NAS signaling transmission message further carries an identifier type of the terminal device, and is used to indicate an identifier of the terminal device used by the terminal device to perform paging.
  • the embodiment shown in FIG. 5 may further include:
  • the core network device receives a notification message sent by the radio access network device, where the notification message is used to notify the terminal device that the device is currently in a connected state or a lightly connected state.
  • FIG. 6 is a signaling transmission method according to an embodiment of the present invention, including:
  • the core network device sends a NAS signaling transmission message to the radio access network device, where the NAS signaling transmission message includes at least a NAS message and a CS domain indication information, where the CS domain indication information is used to notify the terminal device that the CS device has a CS domain.
  • Business request a NAS signaling transmission message to the radio access network device, where the NAS signaling transmission message includes at least a NAS message and a CS domain indication information, where the CS domain indication information is used to notify the terminal device that the CS device has a CS domain.
  • the NAS signaling transmission message may include:
  • NAS-PDU Used to encapsulate NAS messages
  • CS domain indication Used to indicate that the NAS message is from the CS domain
  • the NAS signaling transmission message further includes an identifier type of the terminal device.
  • NAS-PDU Used to encapsulate NAS messages
  • CS domain indication Used to indicate that the NAS message is from the CS domain
  • Terminal device identification type Used to indicate the type of paging identifier of the terminal device
  • the identification type information of the terminal device may be a bit, such as 00 or 01, where 00 represents TMSI and 01 represents IMSI.
  • the identity type information of the terminal device may be TMSI or IMSI.
  • the NAS message in Table 1 or Table 2 may be a CS service notification message.
  • the CS service notification message may carry the identifier of the terminal device, and is used to notify the terminal device to page the identifier of the terminal device used when paging.
  • the NAS message can also be other types of notification messages. To save space, it is not described here. As long as the terminal device can be notified that there is a service request from the CS domain, it is protected by the present invention. range.
  • the core network device may determine to send a notification message to the radio access network device based on a paging request from the MSC device.
  • the radio access network device after receiving the NAS signaling transmission message, the radio access network device sends the indication information to the core network device, so that the core network device determines that the current terminal device is in a lightly connected state or a connected state.
  • the core network device may wait for the terminal device to send the service request message to the core network device, and then to the circuit domain device.
  • the MSC sends a confirmation message for the paging message.
  • the core network may directly send the paging message to the circuit domain device MSC. Confirmation message.
  • the indication information that the radio access network device sends to the terminal device includes a NAS message.
  • NAS message in the various embodiments of the present invention may be a NAS message encapsulated in a NAS transport message, and details are not described herein.
  • the radio access network device sends the indication information to the terminal device, including the CS domain indication information paging message.
  • the paging message may further carry a type identifier of the terminal device, where the type identifier is used to indicate that the identifier of the terminal device is TMSI or IMSI.
  • the radio access network device sends the indication information determined in step 602 to the terminal device.
  • the terminal device After receiving the indication message, the terminal device determines, according to the indication message, a process of initiating a service request.
  • the terminal device determines, according to the CS domain indication information in the paging message, the originating service request procedure.
  • the service request procedure may be used to notify the core network device that the terminal is to initiate a CSFB service request or a CSFB service response.
  • the terminal device determines the originating service request process.
  • the terminal device determines that the CS domain device pages the terminal device by using the terminal identifier corresponding to the type identifier, and the terminal may use the type identifier in subsequent processing.
  • the corresponding terminal identifier communicates with the CS domain device.
  • the terminal device determines, according to the CS domain indication information in the paging message, that the initiation service request procedure includes: the terminal device initiates a connection recovery request to the access network device, and receives a connection recovery acknowledgement message sent by the access network device. And sending the service request message to the connection recovery complete message sent by the access network device.
  • FIG. 7 is another signaling transmission method according to an embodiment of the present invention, including:
  • the core network device sends a NAS signaling transmission message to the radio access network device, where the NAS signaling transmission message includes at least the NAS message and the NAS identification information of the terminal device, where the NAS identifier information of the terminal device is used to notify the terminal device that the Service request in the CS domain.
  • the NAS signaling transmission message may include:
  • the NAS message in Table 3 may be a CS service notification message.
  • the CS service notification message may carry the identifier of the terminal device, and is used to notify the terminal device to page the identifier of the terminal device used when paging. It should be noted that the NAS message may also be other types of notification messages. To save space, it is not described here. As long as the terminal device can be notified that the service request from the CS domain is required, the NAS message is protected by the present invention. range.
  • the core network device may determine to send a notification message to the radio access network device based on a paging request from the MSC device.
  • the radio access network device After receiving the NAS signaling transmission message, the radio access network device determines to send the indication information to the terminal device according to the current state of the terminal device.
  • the indication information sent by the radio access network device to the terminal device includes a NAS message, which is a NAS message encapsulated in the NAS transmission message.
  • the radio access network device sends the paging message to the terminal device that the indication information includes the NAS identifier of the mobile terminal device.
  • the radio access network device sends the indication information determined in step 702 to the terminal device.
  • the terminal device determines to initiate the service according to the indication message. Request process.
  • the service request process may be used to notify the core network device that the terminal needs to initiate a CSFB service request or a CSFB service response.
  • the indication message received by the terminal device is a paging message
  • the terminal device identifier in the paging message is the same as the identity of the terminal device itself, it indicates that the terminal device is paged by the radio access network device.
  • the terminal device determines the originating service request process according to the NAS identifier of the terminal device in the paging message.
  • the terminal device determines to initiate a service request procedure according to the CS service notification message included in the NAS message.
  • FIG. 8 is a diagram of a radio access network device according to an embodiment of the present invention. The embodiment is used to perform the behavior and function of a radio access network device in the foregoing method, where the radio access network device includes:
  • the receiving module 801 is configured to receive the non-access stratum NAS message and the first indication information sent by the core network device, where the first indication information is used to notify the terminal device that there is a service request from the circuit switched CS domain.
  • the first indication information received by the receiving module 801 includes CS domain indication information or a NAS identifier of the terminal device.
  • the receiving module 801 is specifically configured to receive a NAS signaling transmission message sent by the core network device, where the NAS signaling transmission message carries the NAS message and the first indication information.
  • the NAS message is a CS service notification message.
  • the NAS signaling transmission message received by the receiving module 801 also carries the terminal.
  • the processing module 802 is configured to determine, according to a current state of the terminal device, the second indication information that is sent to the terminal device, where the second indication information is a NAS message received by the receiving module 801 or a first indication carried by the receiving module 801 Paging message for information.
  • the processing module 802 is specifically configured to: if the current state of the terminal device is a connected state, determine that the second indication information sent to the terminal device includes a NAS message; or if the current state of the terminal device is a light connection state And determining that the second indication information that is sent to the terminal device includes a paging message that carries the first indication information.
  • the processing module 802 is further configured to: when the current state of the terminal device is in a light connection state, the paging message further carries a type identifier of the terminal device, where the type identifier is used to indicate that the terminal device performs paging
  • the identifier used is TMSI or IMSI.
  • the sending module 803 is configured to send the second indication information determined by the processing module 802 to the terminal device.
  • the sending module 803 is further configured to send, to the core network device, notification information, where the notification information is used to notify the core network device that the terminal device is currently in a lightly connected state or a connected state.
  • the physical device corresponding to the receiving module is a receiver
  • the physical device corresponding to the processing module is a processor
  • the physical device corresponding to the sending module is a transmitter.
  • FIG. 9 is a terminal device, which may be used to perform the behavior and function of a terminal device in the foregoing method embodiment, where the terminal device includes:
  • the receiving module 901 is configured to receive second indication information that is sent by the radio access network device, where the second indication information is sent by the radio access network device according to a current state of the terminal device, where the second indication information includes The access layer NAS message or the paging message carrying the first indication information, where the first indication information is used to notify the terminal device that there is a service request from the circuit switched CS domain.
  • the receiving module 901 is specifically configured to: if the terminal device is currently in the connected state, the second indication information sent by the receiving radio access network device includes a NAS message, where the NAS message includes a CS service notification message.
  • the receiving module 901 is specifically configured to: if the terminal device is currently in a light connection state, the second indication information that is sent by the receiving radio access network device includes a paging message that carries the first indication information.
  • the second indication information received by the receiving module 901 further carries a type identifier of the terminal device, and is used to indicate the identifier of the terminal device used by the terminal device to perform paging.
  • the processing module 902 is configured to determine, according to the second indication information received by the receiving module, a service initiation request process.
  • the processing module is specifically configured to: if the second indication information received by the receiving module 901 includes a paging message that carries the first indication information, and determine the terminal identifier in the first indication information and the identifier of the terminal device itself Similarly, the originating service request procedure is determined according to the CS domain indication information in the first indication information.
  • the processing module is specifically configured to: if the received second indication information received by the receiving module 901 includes a NAS message, determine, according to the CS service notification message included in the NAS message, the originating service request procedure.
  • the processing module 902 is further configured to: determine that the CS domain device uses the terminal device identifier corresponding to the terminal device type identifier to page the terminal device, and in the subsequent process, use the terminal device type identifier corresponding to the terminal device.
  • the identity communicates with the CS domain device.
  • the physical device corresponding to the receiving module is a receiver
  • the physical device corresponding to the processing module is a processor
  • FIG. 10 is a core network device, where the core network device can be used to perform the behavior and functions of the core network device in the foregoing method embodiment, including:
  • the receiving module 1001 is configured to receive a paging request.
  • the receiving module 1001 is further configured to receive a notification message sent by the radio access network device, where the notification message is used to notify the terminal device that the device is currently in a connected state or a lightly connected state.
  • the first indication information generated by the processing module 1002 includes CS domain indication information or a NAS identifier of the terminal device.
  • the sending module 1003 is configured to send the processing module 1002 to the radio access network device.
  • the formed NAS message and the paging message carrying the first indication information.
  • the sending module 1003 is specifically configured to send a NAS signaling transmission message to the radio access network device, where the NAS signaling transmission message carries the NAS message and the first indication information.
  • the NAS message is a CS service notification message.
  • the NAS signaling transmission message sent by the sending module 1003 further carries an identifier type of the terminal device, and is used to indicate the identifier of the terminal device used by the terminal device to perform paging.
  • the steps of a method or algorithm described in connection with the present disclosure may be implemented in a hardware, or may be implemented by a processor executing software instructions.
  • the software instructions may be comprised of corresponding software modules that may be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable hard disk, CD-ROM, or any other form of storage well known in the art.
  • An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium.
  • the storage medium can also be an integral part of the processor.
  • the processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in the user equipment. Of course, the processor and storage medium can also be used as points.
  • the vertical component exists in the user device.
  • the functions described herein can be implemented in hardware, software, firmware, or any combination thereof.
  • the functions may be stored in a computer readable medium or transmitted as one or more instructions or code on a computer readable medium.
  • Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another.
  • a storage medium may be any available media that can be accessed by a general purpose or special purpose computer.

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Abstract

采用本发明实施例所提供的方法，无线接入网设备接收NAS信令传输消息后，根据终端设备当前所处的状态确定向终端设备发送的第二指示信息，该第二指示信息包括NAS消息或携带第一指示信息的寻呼消息，无需在接收指示信息前进行连接恢复过程，终端设备可以更快速的接收CS指示信息，提高使用CSFB方案进行语音通信的效率。

Description

一种信令传输的方法、装置及系统 技术领域
本发明涉及通信技术领域，尤指一种信令传输方法、装置及系统。
背景技术
时分长期演进(time division long term evolution，TD-LTE)网络虽然是全分组交换网络，但是语音业务仍然是不可缺少的重要业务。为了确保在TD-LTE网络上能够顺利开展高质量的语音业务，各标准组织都积极研究并提出了多种语音业务解决方案。可以提供语音业务的TD-LTE终端大致分为两种，一种为多模单待终端，另一种为多模双待终端，其中，多模指的是TD-LTE模式、时分码分多址(Time-Division Code Division Multiple Access，TD-CDMA)模式或全球移动通信系统(Global system for mobile communications，GSM)模式。终端设备可以采用电路域交换回落(circuit switch fallback，CFSB)或单一无线语音通话连续性(single radio voice call continuity，SRVCC)方案进行语音业务。
使用CSFB技术的前提条件是：在演进型通用陆地无线接入网络(evolved universal terrestrial radio access network，E-UTRA与UMTS陆地无线接入网络(universal terrestrial radio access network，UTRAN)/GSM/EDGE无线接入网(GSM/EDGE radio access network，GERAN)的重叠覆盖区域、且终端设备具有CSFB功能时，才能使用CSFB技术。
当终端设备当前处于空闲态或连接态时，核心网设备通过无线接入网设备向终端设备发送的CS指示信息，用于通知终端设备采用CSFB方案提供语音服务。但是，当终端设备在连接态和轻连接态之 间的转换时，并不将转换后的状态通知核心网设备，也就是说，不管终端设备当前处于连接态或者轻连接态，核心网都会直接把针对该终端设备的非接入层信令直接发给无线接入网设备。
由于无线接入网设备对所述非接入层信令不进行解析，即无线无线接入网设备并不知道所述非接入层信令是针对CSFB业务的，所以无线接入网设备收到所述非接入层信令后，需要发起寻呼过程通知终端进行连接恢复，终端设备进行连接恢复后，无线接入网设备再将该信令发送给终端设备。但是，终端设备进行连接恢复需要一定的时间，进而造成使用CSFB方案的终端设备出现呼叫延迟的问题。
发明内容
本文描述了一种信令传输方法、装置及系统，用以提高终端设备采用CSFB方案进行语音通信的效率。
一方面，本申请的实施例提供了一种信令传输方法，方法包括无线接入网设备接收核心网设备发送的非接入层NAS消息和第一指示信息，根据终端设备当前所处的状态确定并向终端设备发送第二指示信息。其中，该第二指示信息包括NAS消息或携带第一指示信息寻呼消息。例如，该第一指示信息可以用于通知终端设备有来自于电路交换CS域的业务请求。
采用本发明实施例所提供的方法，无线接入网设备可以根据当前终端设备所处的状态确定指示信息并向终端设备发送，该指示信息可以用于通知终端设备有来自于电路交换CS域的业务请求，避免终端设备在接收接收指示信息之前进行连接恢复流程，提高了进行CSFB业务请求流程的效率。
在一个可能的设计中，无线接入网设备接收核心网设备发送的携带NAS消息和第一指示信息的NAS信令传输消息。从而核心网不需要额外的消息向无线接入网设备通知第一指示信息和NAS消息，能够达到节省信令的目的。
在另一个可能的设计中，该NAS信令传输消息还携带终端设备的标识类型，用于指示终端设备进行寻呼时所使用的终端设备的标识。采用此方案，在终端设备确定CS域设备使用该类型标识所对应终端标识寻呼该终端设备，在后续的处理中，该终端可以使用该类型标识对应的终端标识和CS域设备进行通信。
在另一个可能的设计中，该无线接入网设备根据终端设备当前所处的状态确定向终端设备发送的第二指示信息之后，该方法还包括：该接入网设备向核心网设备发送通知信息，该通知信息用于通知该核心网设备该终端设备当前处于轻连接态或连接态。采用这个设计，可以明确对MSC设备发送的寻呼请求进行响应的时机，有助于提高进行CSFB业务请求流程的效率。
在另一个设计中，如果该终端设备当前的状态为连接态，则该无线接入网设备确定向终端设备发送的第二指示信息包括NAS消息。采用该方案，可以使无线接入网设备可以根据终端设备当前的状态去确定发送的指示信息的内容，快速的通知终端设备进行后续CSFB业务流程。
在另一个可能的设计中，如果该终端设备当前的状态为轻连接态，则该无线接入网设备确定向终端设备发送的第二指示信息包括携 带第一指示信息的寻呼消息。用该方案，可以使无线接入网设备可以根据终端设备当前的状态去确定发送的指示信息的内容，快速的通知终端设备进行后续CSFB业务流程。
在另一个可能的设计中，当该终端设备当前的状态为轻连接态时，该寻呼消息还携带终端设备的类型标识，该类型标识用以指示终端设备进行寻呼时所使用的标识为临时移动台标识TMSI或者国际移动用户识别码IMSI。
另一方面，本申请的实施例提供了一种信令传输方法，包括：终端设备接收无线接入网设备发送的第二指示信息，该终端设备根据第二指示信息确定发起业务请求流程。具体的，该第二指示信息为该无线接入网设备根据终端设备当前所处的状态发送的，该第二指示信息包括非接入层NAS消息或第一指示信息，其中，该第一指示信息用于通知终端设备有来自电路交换CS域的业务请求。该实施例的效果请参照上述实施例。
在一个可能的设计中，如果该终端设备当前所处的状态为连接态，该终端设备接收无线接入网设备发送的第二指示信息包括NAS消息。
在另一个可能的设计中，如果该终端设备当前所处的状态为轻连接态，该终端设备接收无线接入网设备发送的第二指示信息包括携带第一指示信息的寻呼消息。
在另一个可能的设计中，如果终端设备收到的第二指示信息包括携带第一指示信息的寻呼消息，且该终端设备确定该寻呼消息中的终 端标识与该终端设备自身的标识相同，该终端设备根据寻呼消息中的CS域指示信息确定发起业务请求流程。
在另一个可能的设计中，如果终端设备收到第二指示信息包括NAS消息，该终端设备根据该NAS消息中包含的CS业务通知消息确定发起业务请求流程。
在另一个可能设计中，该第二指示信息还携带终端设备的类型标识，用于指示终端设备进行寻呼时所使用的终端设备的标识。采用这个方案，在后续的处理中，该终端可以使用该类型标识对应的终端标识和CS域设备进行通信。
再一方面，本申请的实施例提供了一种信令传输方法，包括：核心网设备接收寻呼请求，根据该寻呼请求生成非接入层NAS消息和第一指示信息，向无线接入网设备发送NAS消息和第一指示信息，该第一指示信息用于通知终端设备有来自于电路交换CS域网络的业务请求，所述NAS消息或第一指示信息用于所述无线接入网设备根据终端设备当前所处的状态确定第二指示信息，所述第二指示信息包括NAS消息或携带第一指示信息的寻呼消息。该实施例的有益效果请参考上述实施例。
在另一个可能的设计中，该核心网设备向无线接入网设备发送NAS信令传输消息，该NAS信令传输消息携带NAS消息和第一指示信息。进一步，该NAS信令传输消息还携带终端设备的标识类型，用于指示终端设备进行寻呼时所使用的终端设备的标识。
在另一个设计中，该方法还包括：该核心网设备接收无线接入网 设备发送的通知消息，该通知消息用于通知终端设备当前处于连接态或轻连接态。采用该方案，可以使核心网设备更加快速的获知终端设备的当前状态，从而更进一步的推进终端设备采用CSFB方案进行语音呼叫的进程，从而提高进行语音呼叫的效率。
在上述本申请提供的实施例，该NAS消息为CS业务通知消息。
在上述本申请提供的实施例，该第一指示信息包括CS域指示信息或者终端设备的NAS标识。从而使无线接入网设备能够明确获知该消息为CS域的相关信息。
又一方面，本发明实施例提供了一种无线接入网设备，该无线接入网设备具有实现上述方法实施例中无线接入网设备行为的功能，该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现，该硬件或软件包括一个或多个与上述功能相对应的模块。
在一个可能的设计中，无线接入网设备包括接收器、处理器和发射器，该处理器被配置为支持无线接入网设备执行上述方法中的相应功能。该发射器用于支持无线接入网设备与终端设备之间的通信，向终端设备发送处理器所确定的第二指示信息。该无线接入网设备还可以包括存储器，该存储器用于与处理器耦合，其保存基站必要的程序指令和数据。
又一方面，本发明实施例提供了一种终端设备，该终端设备具有实现上述方法设计中的终端设备的行为的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。该模块可以是软件和/或硬件。
在一个可能的设计中，终端设备的结构包括接收器和处理器，该接收器被配置为支持终端设备接收上述无线接入网设备确定并发送的第二信息。该处理器控制终端设备根据第二指示信息确定发起业务请求流程。
又一方面，本发明实施例提供了一种核心网设备，该核心网设备具有实现上述方法设计中核心网设备的行为的功能，该功能可以通过硬件来实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
在一个可能设计中，核心网设备的结构中包括接收器、处理器和发射器，该处理器被配置为支持上述方法中相应的功能。该接收器用于支持核心网设备与MCS进行通信，接收MCS设备发送的寻呼消息。该发射器用于支持核心网设备与无线接入网设备之间的通信，向无线接入网设备发送NAS消息和第一指示信息。该核心网设备还可以包括存储器，该存储器用于与处理器耦合，其保存核心网设备必要的程序指令和数据。
又一方面，本发明实施例提供了一种信令传输系统，该系统包括上述方面该的无线接入网设备、终端设备和核心网设备。
再一方面，本发明实施例提供了一种计算机存储介质，用于储存为上述无线接入网设备所用的计算机软件指令，其包含用于执行上述方面所设计的程序。
再一方面，本发明实施例提供了一种计算机存储介质，用于储存 为上述终端设备所用的计算机软件指令，其包含用于执行上述方面所设计的程序。
再一方面，本发明实施例提供了一种计算机存储介质，用于储存为上述核心网设备所用的计算机软件指令，其包含用于执行上述方面所设计的程序。
相较于现有技术，本发明提供的方案，终端设备可以更快速的接收有来自于CS域业务请求的通知，进而提高后续使用CSFB方案进行语音通信的效率。
附图说明
图1为现有技术中处于轻连接态的终端设备数据传输的流程示意图；
图2为现有技术中无线接入网设备控制终端设备在连接态和轻连接态转换时的通信示意图；
图3为本发明实施例提供的一种信令传输方法中无线接入网设备的流程示意图；
图4为本发明实施例提供的另一种信令传输方法中终端设备的流程示意图；
图5为本发明实施例提供的另一种信令传输方法中核心网设备的流程示意图；
图6为本发明实施例提供的另一种信令传输方法的流程示意图；
图7为本发明实施例提供的另一种信令传输方法的流程示意图；
图8为本发明实施例提供的一种无线接入网设备的结构示意图；
图9为本发明实施例提供的一种终端设备的结构示意图；
图10为本发明实施例提供的一种核心网设备的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明的一部分实施例，而不是全部实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动的前提下所获得的所有其他实施例，都应属于本发明保护的范围。
本发明实施例所应用的通信系统可以为全球移动通讯(Global System of Mobile communication，GSM)系统、码分多址(Code Division Multiple Access，CDMA)系统、宽带码分多址(Wideband Code Divis ion Multiple Access，WCDMA)系统、通用分组无线业务(General Packet Radio Service，GPRS)、长期演进(Long Term Evolution，LTE)系统、LTE频分双工(Frequency Division Duplex，FDD)系统、LTE时分双工(Time Division Duplex，TDD)、通用移动通信系统(Universal Mobile Telecommunication System，UMTS)，及其他应用正交频分(OFDM)技术的无线通信系统等。本发明实施例描述的系统架构以及业务场景是为了更加清楚的说明本发明实施例的技术方案，并不构成对于本发明实施例提供的技术方案的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本发明实施例提供的技术方案对于类似的技术问题，同样适用。
在本发明实施例中所涉及的无线接入网设备可用于为终端设备 提供无线通信功能。该无线接入网设备可以包括各种形式的宏基站，微基站(也称为小站)，中继站，接入点等。该无线接入网设备可以是GSM或CDMA中的基站(Base T接入网sceiver Station，BTS)，也可以是WCDMA中的基站(NodeB，NB)，还可以是LTE中的演进型基站(Evolutional Node B，eNB或e-NodeB)，以及可以是5G网络中对应的设备gNB。为方便描述，本发明所有实施例中，上述为终端设备提供无线通信功能的装置统称为无线接入网设备。
在本发明实施例中，该终端设备也可称之为用户设备(User Equipment，UE)、移动台(Mobile Station，MS)、移动终端(Mobile Terminal)等，该终端设备可以经无线接入网(Radio Access Network，RAN)与一个或多个核心网进行通信，例如，终端设备可以是移动电话(或称为“蜂窝”电话)、具有移动终端的计算机等，例如，终端设备还可以是便携式、袖珍式、手持式、计算机内置的或者车载的移动装置，它们与无线接入网交换语言和/或数据。本发明实施例中不做具体限定。
在本发明实施例中，该核心网设备控制一个或多个无线接入网设备，可以对系统中的资源进行统一调度，也可以给终端设备配置资源等。例如，该无线接入网设备可以为UMTS系统中的Node B和RNC，该核心网设备可以为SGSN和GGSN。又例如，该无线接入网设备可以为LTE系统中的eNB，则该核心网设备可以为MME。再例如，该核心网设备可以为无线网络跨制式协同控制器等，在本发明实施例中不作具体限定。
终端设备可以在第一无线接入网(Residential Access Network，RAN)设备指示下进入轻连接态。该轻连接态是介于无线资源控制(Radio Resource Control，RRC)连接态和空闲(Idle)态之间的一种状态。进入轻连接态的终端设备释放RRC连接，但和该第一无线接入网设备均保存连接信息。同时，该第一无线接入网设备为该终端设备分配一个上下文标识。
如图1为处于轻连接态的终端设备的移动场景，该移动场景中涉及了三个无线接入网设备。其中，第一无线接入网设备可以指示该终端设备进入轻连接态，并为该终端设备分配上下文标识。另外，终端设备的上下文信息存储在第一无线接入网设备，该上下文信息包含该第一无线接入网设备与该终端设备之间的连接配置参数。终端设备可以在寻呼区域1中自由移动，而不用通知第一无线接入网设备，每个寻呼区域可以包括一个或多个无线接入网设备管理的小区集合。该场景下，终端设备1和第一无线接入网设备处于相同的寻呼区域1，当该终端设备有数据传输需求时，可以使用保存的该上下文信息恢复该终端设备1与该第一无线接入网设备之间的RRC连接，从而避免了RRC连接重建过程中的信令负荷。
需要特别说明的是，本文中所描述的轻连接态为本发明定义的终端设备状态，包括该终端设备的核心网接口保存在无线接入网设备，并且该终端设备可以执行基于小区重选的移动性。该轻连接态可以是连接态的一个子状态或者是空闲态的一个增强状态，也可以叫做非激活态、去激活态、低开销态或者其他名字，本发明对此不做限定。例如，该终端设备的轻连接态可以是空闲态，终端设备保存连接上下文， 当该终端设备清除该连接上下文后，进入正常的空闲态。或者，轻连接态可以是连接态、且被允许执行移动性管理(如小区重选)的终端设备的状态。当终端设备在轻连接态停止执行移动性管理后即可进入正常连接态。
如图2所示，当无线接入网设备控制终端设备在连接态和轻连接态之间的转换时，无线接入网设备并不通知核心网设备，所以不管终端设备处于连接接态还是轻连接态，核心网设备都会将该终端设备的包含CS业务通知消息的NAS传输消息发送给无线接入网设备，无线接入网设备收到该NAS传输消息后，需要将其中包含的NAS消息发送给终端设备，由于不知道终端设备的具体位置，只能发起寻呼过程，终端设备进行连接恢复流程后，无线接入网设备可以将该NAS消息通过恢复的连接发给终端设备，进而终端设备才可以采用CSFB方案来提供语音服务。
但是，终端设备进行连接恢复、且通过恢复的连接接收CS指示信息后，才能够采用CSFB方案来进行语音服务，这个过程需要一定的时间，造成使用CSFB方案的终端设备进行语音呼叫出现呼叫延迟的问题。
基于上述技术问题，本发明实施例提供的一种信令传输方法，通过无线接入网设备接收核心网设备发送的NAS信令传输消息后，根据当前终端设备所处的状态确定向终端设备发送指示信息，使终端设备不需要进行连接恢复流程，就可以快速的接收CS指示信息，提高了使用CSFB方案进行语音呼叫的效率。
图3为本发明实施例提供的一种信令传输方法，包括：
301、无线接入网设备接收核心网设备发送的非接入层NAS消息和第一指示信息，该第一指示信息用于通知终端设备有来自于电路交换CS域的业务请求。
示例性的，该第一指示信息可以包括CS域指示信息，用于指示该NAS消息是来自CS域。
示例性的，该第一指示信息可以包括终端设备的NAS标识，用于指示终端设备的寻呼标识类型为临时移动台标识(temporary mobile subscriber identity，TMSI)或者国际移动用户识别码(International mobile subscriber identity，IMSI)。
示例性的，该第一指示信息可以包括CS域指示和终端设备标识类型，其中，CS域指示用于指示NAS消息来自CS域，终端设备标识类型用于指示终端设备的寻呼标识类型。例如，终端设备标识可以为比特位，例如00或01，其中，00代表TMSI，01代表IMSI，反之亦然。或者，终端设备的标识类型信息可以为TMSI或IMSI。上述对终端设备的标识的举例只是为了更好的理解本发明方案所举的例子，本发明包括并不限于此，只要是标识类信息，可以指示终端设备的寻呼标识类型，都属于本发明实施例所保护的范围。
示例性的，该NAS消息可以为CS业务通知消息，用于通知终端设备有需要处理的CS业务请求。
示例性的，该无线接入网设备接收核心网设备通过NAS信令传输消息发送的NAS消息和第一指示信息。
示例性的，该NAS信令传输消息还可以携带终端设备的标识类型，用于指示终端设备进行寻呼时所使用的终端设备的标识。
302、该无线接入网设备根据终端设备当前所处的状态确定向终端设备发送的第二指示信息，该第二指示信息包括NAS消息或携带第一指示信息的寻呼消息。
示例性的，如果该终端设备当前的状态为连接态，则该无线接入网设备确定向终端设备发送的第二指示信息包括NAS消息。
示例性的，如果该终端设备当前的状态为轻连接态，则该无线接入网设备确定向终端设备发送的第二指示信息包括携带第一指示信息的寻呼消息。
示例性的，当该终端设备当前的状态为轻连接态时，该寻呼消息还携带终端设备的类型标识，该类型标识用以指示终端设备进行寻呼时所使用的标识为TMSI或者IMSI。
303、该无线接入网设备向终端设备发送该第二指示信息。
现有技术中，由于无线接入网设备不知道终端设备的具体位置，只能发起寻呼过程，终端设备接收寻呼消息后，进行连接恢复，在恢复的连接上接收CS域的指示信息。由于终端设备采用连接恢复流程进行连接恢复时，需要一定的时间，造成终端设备使用CSFB方案的进行语音呼叫出现语音延迟的问题。而采用本发明实施例所提供的方法，无线接入网设备接收NAS信令传输消息后，根据当前终端设备所处的状态确定向终端设备发送的指示信息，无需在接收指示信息前进行连接恢复过程，终端设备可以更快速的接收CS指示信息，提高使 用CSFB方案进行语音通信的效率。
做为本发明实施例的一个扩展方案，图3所示实施例还可以包括：
305、该接入网设备向核心网设备发送通知信息，该通知信息用于通知该核心网设备该终端设备当前处于轻连接态或连接态。
这种方式，可以使核心网设备更加快速的获知终端设备的状态，为后续的流程做准备。
图4为本发明实施例提供的另一种信令传输方法，包括：
401、终端设备接收无线接入网设备发送的第二指示信息，该第二指示信息包括该无线接入网设备根据终端设备当前所处的状态发送的，该第二指示信息包括非接入层NAS消息或第一指示信息，该第一指示信息用于通知终端设备有来自电路交换CS域的业务请求。
该第一指示信息所包括的内容请参照图3所示实施例，在此不再赘述。
示例性的，如果该终端设备当前所处的状态为连接态，该终端设备接收无线接入网设备发送的第二指示信息包括NAS消息。例如该NAS消息可以CS业务通知消息。
示例性的，如果该终端设备当前所处的状态为轻连接态，该终端设备接收无线接入网设备发送的第二指示信息包括携带第一指示信息的寻呼消息。
示例性的，该第二指示信息还携带终端设备的类型标识，用于指示终端设备进行寻呼时所使用的终端设备的标识。终端设备确定CS 域设备使用该终端设备类型标识所对应的终端设标识寻呼该终端设备时，所终端设备在后续的流程中，采用该终端设备类型标识所对应的终端标识与CS域设备进行通信。
402、该终端设备根据第二指示信息确定发起业务请求流程。
示例性的，如果终端设备收到的第二指示信息包括携带第一指示信息的寻呼消息，且该终端设备确定该寻呼消息中的终端标识与该终端设备自身的标识相同，该终端设备根据寻呼消息中的CS域指示信息确定发起业务请求流程。
示例性的，如果终端设备收到第二指示信息包括NAS消息，该终端设备根据该NAS消息中包含的CS业务通知消息确定发起业务请求流程。
该实施例的有益效果请参照前述实施例，在此不再赘述。
图5为本发明实施例提供的另一种信令传输方法，包括：
501、核心网设备接收寻呼请求。
502、核心网设备根据该寻呼请求生成非接入层NAS消息和第一指示信息，该第一指示信息用于通知终端设备有来自于电路交换CS域网络的业务请求。
该第一指示信息所包括的内容请参照前述实施例，在此不再赘述。
503、核心网设备向无线接入网设备发送NAS消息和第一指示信息。
示例性的，该核心网设备向无线接入网设备发送NAS信令传输消 息，该NAS信令传输消息携带NAS消息和第一指示信息。具体的，该NAS消息可以为CS业务通知消息。
示例性的，该NAS信令传输消息还携带终端设备的标识类型，用于指示终端设备进行寻呼时所使用的终端设备的标识。
该实施例的有益效果请参照图3所示的实施例在此不再赘述。
做为本发明实施例的一个扩展方案，图5所示的实施例还可以包括：
504、该核心网设备接收无线接入网设备发送的通知消息，该通知消息用于通知终端设备当前处于连接态或轻连接态。
图6为本发明实施例提供的一种信令传输方法，包括：
601、核心网设备向无线接入网设备发送NAS信令传输消息，该NAS信令传输消息至少包括NAS消息和CS域指示信息，该CS域指示信息用于通知终端设备有来自于CS域的业务请求。
示例性的，如表1所示，NAS信令传输消息可以包括：
NAS-PDU 用于封装NAS消息
CS域指示 用于指示该NAS消息来自CS域
表1
示例性的，如表2所示，该NAS信令传输消息还包括终端设备的标识类型。
NAS-PDU 用于封装NAS消息
CS域指示 用于指示该NAS消息来自CS域
终端设备标识类型 用于指示终端设备的寻呼标识类型
表2
示例性的，终端设备的标识类型信息可以为比特位，例如00或01，其中，00代表TMSI，01代表IMSI。
示例性的，终端设备的标识类型信息可以为TMSI或IMSI。
示例性的，表1或表2中的NAS消息可以为CS业务通知消息。该CS业务通知消息中可以携带终端设备的标识，用于在进行寻呼时，通知终端设备寻呼所使用的终端设备的标识。需要特别说明的是，该NAS消息还可以为其他类型的通知消息，为了节省篇幅，在此不一一赘述，只要能够通知终端设备该有来自于CS域的业务请求，都是本发明保护的范围。
示例性的，核心网设备可以根据来自MSC设备的寻呼请求确定向无线接入网设备发送通知消息。
602、无线接入网设备接收NAS信令传输消息后，根据当前终端设备所处的状态确定向终端设备发送指示信息。
可选的，无线接入网设备接收NAS信令传输消息后，向核心网设备发送指示信息，以便核心网设备确定当前终端设备处于轻连接态或者连接态。
示例性的，核心网设备确定该设备处于轻连接态后，可以等待该终端设备向该核心网设备发送该业务请求消息后，再向电路域设备 MSC发送寻呼消息的确认消息。
示例性的，如果核心网没有收到该指示信息或者收到的指示信息指示该终端设备当前处于连接态，则确定该设备处于连接态，核心网设备可以直接向电路域设备MSC发送寻呼消息的确认消息。
示例性的，如果终端设备当前所处的状态为连接态，则无线接入网设备向终端设备发送的指示信息包括NAS消息。
需要特别说明的是，本发明各个实施例中的NAS消息可以为封装在NAS传输消息中的NAS消息，在此不再赘述。
示例性的，如果终端设备当前处于轻连接态，则无线接入网设备向终端设备发送指示信息包括携带CS域指示信息寻呼消息。进一步，该寻呼消息还可以携带终端设备的类型标识，该类型标识用以指示终端设备的标识为TMSI或者IMSI。
603、无线接入网设备向终端设备发送步骤602确定的指示信息。
604、终端设备接收指示消息后，根据该指示消息确定发起业务请求流程。
示例性的，如果终端设备收到的指示消息包括携带CS域指示信息寻呼消息，并且寻呼消息中的终端设备标识和该终端设备自身的标识相同，则表示该终端设备被无线接入网设备寻呼到，终端设备根据寻呼消息中的CS域指示信息确定发起业务请求流程。该业务请求流程可以用于通知核心网设备该终端将要发起CSFB业务请求或者CSFB业务响应。
示例性的，如果指示消息包括NAS消息，则终端设备根据该NAS 消息中包含的CS业务通知消息确定发起业务请求流程。
示例性的，如果指示消息中还带终端设备的类型标识，则终端设备确定CS域设备使用该类型标识所对应终端标识寻呼该终端设备，在后续的处理中，该终端可以使用该类型标识对应的终端标识和CS域设备进行通信。
示例性的，终端设备根据寻呼消息中的CS域指示信息确定发起业务请求流程包括：该终端设备向该接入网设备发起连接恢复请求，并接收该接入网设备发送的连接恢复确认消息，再向该接入网设备发送的连接恢复完成消息中携带该业务请求消息。
现有技术中，由于不知道终端设备的具体位置，只能发起寻呼过程，终端设备进行连接恢复后，才能够接收CS域的指示信息，由于终端设备采用连接恢复流程进行连接恢复时，需要一定的时间，会造成使用CSFB方案的进行语音呼叫延迟的问题。而采用本发明实施例所提供的方法，无线接入网设备接收NAS信令传输消息后，根据当前终端设备所处的状态确定向终端设备发送的指示信息，无需在接收指示信息前进行连接恢复过程，终端设备可以更快速的接收CS指示信息，提高使用CSFB方案进行语音通信的效率。
图7为本发明实施例提供的另一种信令传输方法，包括：
701、核心网设备向无线接入网设备发送NAS信令传输消息，该NAS信令传输消息至少包括NAS消息和终端设备的NAS标识信息，该终端设备的NAS标识信息用于通知终端设备有来自于CS域的业务请求。
示例性的，如表3所示，该NAS信令传输消息可以包括：
Figure PCTCN2016104702-appb-000001
表3
示例性的，表3中的NAS消息可以为CS业务通知消息。该CS业务通知消息中可以携带终端设备的标识，用于在进行寻呼时，通知终端设备寻呼所使用的终端设备的标识。需要特别说明的是，该NAS消息还可以为其他类型的通知消息，为了节省篇幅，在此不一一赘述，只要能够通知终端设备该有来自于CS域的业务请求，都属于本发明保护的范围。
示例性的，核心网设备可以根据来自MSC设备的寻呼请求确定向无线接入网设备发送通知消息。
702、无线接入网设备接收NAS信令传输消息后，根据当前终端设备所处的状态确定向终端设备发送指示信息。
示例性的，如果终端设备当前所处的状态为连接态，则无线接入网设备向终端设备发送的指示信息包括NAS消息，该NAS消息为封装在NAS传输消息中的NAS消息。
示例性的，如果终端设备当前处于轻连接态，则无线接入网设备向终端设备发送指示信息包括携带终端设备的NAS标识的寻呼消息。
703、无线接入网设备向终端设备发送步骤702确定的指示信息。
704、终端设备接收指示消息后，根据该指示消息确定发起业务 请求流程。
示例性的，该业务请求流程可以用于通知核心网设备该终端需要发起CSFB业务请求或者CSFB业务响应。
示例性的，如果终端设备收到的指示消息为寻呼消息，并且寻呼消息中的终端设备标识和该终端设备自身的标识相同，则表示该终端设备被无线接入网设备寻呼到，终端设备根据寻呼消息中的终端设备的NAS标识确定发起业务请求流程。
示例性的，如果指示消息为NAS消息，则终端设备根据该NAS消息中包含的CS业务通知消息确定发起业务请求流程。
该实施例的有益效果请参照图6所示的实施例，在此不再赘述。
图8为本发明实施像提供的一种无线接入网设备，该实施例用于执行上述方法实施例中无线接入网设备的行为和功能，该无线接入网设备包括：
接收模块801，用于接收核心网设备发送的非接入层NAS消息和第一指示信息，该第一指示信息用于通知终端设备有来自于电路交换CS域的业务请求。
示例性的，该接收模块801接收的第一指示信息包括CS域指示信息或者终端设备的NAS标识。
示例性的，该的接收模块801具体用于接收核心网设备发送的NAS信令传输消息，该NAS信令传输消息携带NAS消息和第一指示信息。具体的，该NAS消息为CS业务通知消息。
示例性的，该接收模块801接收的NAS信令传输消息还携带终端 设备的标识类型，用于指示终端设备进行寻呼时所使用的终端设备的标识。
处理模块802，用于根据终端设备当前所处的状态确定向终端设备发送的第二指示信息，该第二指示信息为该接收模块801接收的NAS消息或该接收模块801接收的携带第一指示信息的寻呼消息。
示例性的，该处理模块802具体用于：如果该终端设备当前的状态为连接态，则确定向终端设备发送的第二指示信息包括NAS消息；或者如果该终端设备当前的状态为轻连接态，则确定向终端设备发送的第二指示信息包括携带第一指示信息的寻呼消息。
示例性的，该处理模块802还用于，当该终端设备当前的状态为轻连接态时，该寻呼消息还携带终端设备的类型标识，该类型标识用以指示终端设备进行寻呼时所使用的标识为TMSI或者IMSI。
发送模块803，用于向终端设备发送该处理模块802确定的第二指示信息。
示例性的，该发送模块803还用于向核心网设备发送通知信息，该通知信息用于通知该核心网设备该终端设备当前处于轻连接态或连接态。
图8所示实施例的有益效果请参照上述对应方法实施例的有益效果，在此不再赘述。
需要特别说明的是，图8所示的实施例中，接收模块对应的实体设备为接收器，处理模块对应的实体设备为处理器，发送模块对应的实体设备为发射器。
图9为本发明实施例提供的一种终端设备，该终端设备可以用于执行上述方法实施例中终端设备的行为和功能，该终端设备包括：
接收模块901，用于接收无线接入网设备发送的第二指示信息，该第二指示信息为该无线接入网设备根据该终端设备当前所处的状态发送的，该第二指示信息包括非接入层NAS消息或携带第一指示信息的寻呼消息，该第一指示信息用于通知该终端设备有来自电路交换CS域的业务请求。
示例性的，该接收模块901具体用于：如果该终端设备当前所处的状态为连接态，接收无线接入网设备发送的第二指示信息包括NAS消息，该NAS消息包括CS业务通知消息。
示例性的，该接收模块901具体用于：如果该终端设备当前所处的状态为轻连接态，接收无线接入网设备发送的第二指示信息包括携带第一指示信息的寻呼消息。
示例性的，该接收模块901接收的第二指示信息还携带终端设备的类型标识，用于指示终端设备进行寻呼时所使用的终端设备的标识。
处理模块902，用于根据接收模块接收的第二指示信息确定发起业务请求流程。
示例性的，该处理模块具体用于如果接收模块901收到的第二指示信息包括携带第一指示信息的寻呼消息，且确定该第一指示信息中的终端标识与该终端设备自身的标识相同，该根据第一指示信息中的CS域指示信息确定发起业务请求流程。
示例性的，该处理模块具体用于：如果接收模块901接收的收到第二指示信息包括NAS消息，根据该NAS消息中包含的CS业务通知消息确定发起业务请求流程。
示例性的，该处理模块902还用于确定CS域设备使用该终端设备类型标识所对应的终端设标识寻呼该终端设备，以及在后续的流程中，采用该终端设备类型标识所对应的终端标识与CS域设备进行通信。
需要特别说明的是，图9所示实施例中，接收模块对应的实体设备为接收器，处理模块对应的实体设备为处理器。
图9所示实施例的有益效果请参照上述对应方法实施例的有益效果，在此不再赘述。
图10为本发明实施例提供的一种核心网设备，该核心网设备可以用于执行上述方法实施例中核心网设备的行为和功能，包括：
接收模块1001，用于接收寻呼请求。
示例性的，接收模块1001还用于接收无线接入网设备发送的通知消息，该通知消息用于通知终端设备当前处于连接态或轻连接态。
处理模块1002，用于根据该接收模块1001接收的寻呼请求生成非接入层NAS消息和携带第一指示信息的寻呼消息，该第一指示信息用于通知终端设备有来自于电路交换CS域网络的业务请求。
示例性的，该处理模块1002生成的第一指示信息包括CS域指示信息或者终端设备的NAS标识。
发送模块1003，用于向无线接入网设备发送该处理模块1002生 成的NAS消息和携带第一指示信息的寻呼消息。
示例性的，该发送模块1003具体用于向无线接入网设备发送NAS信令传输消息，该NAS信令传输消息携带NAS消息和第一指示信息。具体的，该NAS消息为CS业务通知消息。
示例性的，该发送模块1003发送的该NAS信令传输消息还携带终端设备的标识类型，用于指示终端设备进行寻呼时所使用的终端设备的标识。
需要特别说明的是，本发明实施例中，接收模块对应的实体设备为接收器，处理模块对应的实体设备为处理器，发送模块对应的实体设备为发送器。
该实施例的有益效果可以参照上述对应方法实施例的有益效果。
本发明实施例还提供一种信令传输系统，该系统包括上述图8该的无线接入网设备、图9所示的终端设备和图10该的核心网设备。
结合本发明公开内容所描述的方法或者算法的步骤可以硬件的方式来实现，也可以是由处理器执行软件指令的方式来实现。软件指令可以由相应的软件模块组成，软件模块可以被存放于RAM存储器、闪存、ROM存储器、EPROM存储器、EEPROM存储器、寄存器、硬盘、移动硬盘、CD-ROM或者本领域熟知的任何其它形式的存储介质中。一种示例性的存储介质耦合至处理器，从而使处理器能够从该存储介质读取信息，且可向该存储介质写入信息。当然，存储介质也可以是处理器的组成部分。处理器和存储介质可以位于ASIC中。另外，该ASIC可以位于用户设备中。当然，处理器和存储介质也可以作为分 立组件存在于用户设备中。
本领域技术人员应该可以意识到，在上述一个或多个示例中，本发明所描述的功能可以用硬件、软件、固件或它们的任意组合来实现。当使用软件实现时，可以将这些功能存储在计算机可读介质中或者作为计算机可读介质上的一个或多个指令或代码进行传输。计算机可读介质包括计算机存储介质和通信介质，其中通信介质包括便于从一个地方向另一个地方传送计算机程序的任何介质。存储介质可以是通用或专用计算机能够存取的任何可用介质。
以上该的具体实施方式，对本发明的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上该仅为本发明的具体实施方式而已，并不用于限定本发明的保护范围，凡在本发明的技术方案的基础之上，所做的任何修改、等同替换、改进等，均应包括在本发明的保护范围之内。

Claims (39)

  1. 一种信令传输方法，其特征在于，包括：
    无线接入网设备接收核心网设备发送的非接入层NAS消息和第一指示信息，所述第一指示信息用于通知终端设备有来自于电路交换CS域的业务请求；
    所述无线接入网设备根据终端设备当前所处的状态确定向终端设备发送的第二指示信息，所述第二指示信息包括NAS消息或携带第一指示信息寻呼消息；
    所述无线接入网设备向终端设备发送所述第二指示信息。
  2. 根据权利要求1所述的方法，其特征在于，所述第一指示信息包括CS域指示信息或者终端设备的NAS标识。
  3. 根据权1或2所述的方法，其特征在于，无线接入网设备接收核心网设备发送的NAS消息和第一指示信息包括：
    所述无线接入网设备接收核心网设备发送的NAS信令传输消息，所述NAS信令传输消息携带NAS消息和第一指示信息。
  4. 根据权3所述的方法，其特征在于，所述NAS信令传输消息还携带终端设备的标识类型，用于指示终端设备进行寻呼时所使用的终端设备的标识。
  5. 根据权利要求1至4任一权要所述的方法，其特征在于，所述NAS消息为CS业务通知消息。
  6. 根据权利要求1至5任一权要所述的方法，其特征在于，所述无线接入网设备根据终端设备当前所处的状态确定向终端设备发 送的第二指示信息之后，所述方法还包括：
    所述接入网设备向核心网设备发送通知信息，所述通知信息用于通知所述核心网设备所述终端设备当前处于轻连接态或连接态。
  7. 根据权利要求1至6任一权要所述的方法，其特征在于，所述无线接入网设备根据当前终端设备所处的状态确定向终端设备发送的第二指示信息包括：
    如果所述终端设备当前的状态为连接态，则所述无线接入网设备确定向终端设备发送的第二指示信息包括NAS消息；或者
    如果所述终端设备当前的状态为轻连接态，则所述无线接入网设备确定向终端设备发送的第二指示信息包括携带第一指示信息的寻呼消息。
  8. 根据权7所述的方法，其特征在于，当所述终端设备当前的状态为轻连接态时，所述寻呼消息还携带终端设备的类型标识，所述类型标识用以指示终端设备进行寻呼时所使用的标识为临时移动台标识TMSI或者国际移动用户识别码IMSI。
  9. 一种信令传输方法，其特征在于，包括：
    终端设备接收无线接入网设备发送的第二指示信息，所述第二指示信息为所述无线接入网设备根据终端设备当前所处的状态发送的，所述第二指示信息包括非接入层NAS消息或携带第一指示信息的寻呼消息，所述第一指示信息用于通知终端设备有来自电路交换CS域的业务请求；
    所述终端设备根据第二指示信息确定发起业务请求流程。
  10. 根据权利要求9所述的方法，其特征在于，所述终端设备接收无线接入网设备发送的第二指示信息包括：
    如果所述终端设备当前所处的状态为连接态，所述终端设备接收无线接入网设备发送的第二指示信息包括NAS消息，所述NAS消息包括CS业务通知消息；或者
    如果所述终端设备当前所处的状态为轻连接态，所述终端设备接收无线接入网设备发送的第二指示信息包括携带第一指示信息的寻呼消息。
  11. 根据权9或10所述的方法，其特征在于，所述终端设备根据第二指示信息确定发起业务请求流程包括：
    如果终端设备收到的第二指示信息包括携带第一指示信息的寻呼消息，且所述终端设备确定所述寻呼消息中的终端标识与所述终端设备自身的标识相同，所述终端设备根据寻呼消息中的CS域指示信息确定发起业务请求流程；或者，
    如果终端设备收到第二指示信息包括NAS消息，所述终端设备根据所述NAS消息中包含的CS业务通知消息确定发起业务请求流程。
  12. 根据权利要求9所述的方法，其特征在于，所述第二指示信息还携带终端设备的类型标识，用于指示终端设备进行寻呼时所使用的终端设备的标识。
  13. 根据权利要求12所述的方法，其特征在于，所述方法还包括：
    终端设备确定CS域设备使用所述终端设备类型标识所对应的终 端设标识寻呼所述终端设备时，所终端设备在后续的流程中，采用所述终端设备类型标识所对应的终端标识与CS域设备进行通信。
  14. 一种信令传输方法，其特征在于，包括：
    核心网设备接收寻呼请求；
    根据所述寻呼请求生成非接入层NAS消息和第一指示信息，所述第一指示信息用于通知终端设备有来自于电路交换CS域网络的业务请求；
    核心网设备向无线接入网设备发送NAS消息和第一指示信息，所述NAS消息或第一指示信息用于所述无线接入网设备根据终端设备当前所处的状态确定第二指示信息，所述第二指示信息包括NAS消息或携带第一指示信息的寻呼消息。
  15. 根据权利要求14所述的方法，其特征在于，所述第一指示信息包括CS域指示信息或者终端设备的NAS标识。
  16. 根据权利要求14或15所述的方法，其特征在于，所述核心网设备向无线接入网设备发送NAS消息和第一指示信息包括：
    所述核心网设备向无线接入网设备发送NAS信令传输消息，所述NAS信令传输消息携带NAS消息和第一指示信息。
  17. 根据权16所述的方法，其特征在于，所述NAS信令传输消息还携带终端设备的标识类型，用于指示终端设备进行寻呼时所使用的终端设备的标识。
  18. 根据权利要求14至17任一权要所述的方法，其特征在于，所述NAS消息为CS业务通知消息。
  19. 根据权利要求14至18任一权要所述的方法，其特征在于，所述方法还包括：
    所述核心网设备接收无线接入网设备发送的通知消息，所述通知消息用于通知终端设备当前处于连接态或轻连接态。
  20. 一种无线接入网设备，其特征在于，包括：
    接收模块，用于接收核心网设备发送的非接入层NAS消息和第一指示信息，所述第一指示信息用于通知终端设备有来自于电路交换CS域的业务请求；
    处理模块，用于根据终端设备当前所处的状态确定向终端设备发送的第二指示信息，所述第二指示信息包括所述接收模块接收的NAS消息或所述接收模块接收的携带第一指示信息的寻呼消息；
    发送模块，用于向终端设备发送所述处理模块确定的第二指示信息。
  21. 根据权利要求20所述的无线接入网设备，其特征在于，所述接收模块接收的第一指示信息包括CS域指示信息或者终端设备的NAS标识。
  22. 根据权20或21所述的无线接入网设备，其特征在于，所述的接收模块具体用于接收核心网设备发送的NAS信令传输消息，所述NAS信令传输消息携带NAS消息和第一指示信息。
  23. 根据权22所述的无线接入网设备，其特征在于，所述接收模块接收的NAS信令传输消息还携带终端设备的标识类型，用于指示终端设备进行寻呼时所使用的终端设备的标识。
  24. 根据权利要求19至23任一权要所述的无线接入网设备，其特征在于，所述NAS消息为CS业务通知消息。
  25. 根据权利要求19至24任一权要所述的无线接入网设备，其特征在于，所述发送模块还用于向核心网设备发送通知信息，所述通知信息用于通知所述核心网设备所述终端设备当前处于轻连接态或连接态。
  26. 根据权利要求19至25任一权要所述的无线接入网设备，其特征在于，所述处理模块具体用于：
    如果所述终端设备当前的状态为连接态，则确定向终端设备发送的第二指示信息包括NAS消息；或者
    如果所述终端设备当前的状态为轻连接态，则确定向终端设备发送的第二指示信息包括携带第一指示信息的寻呼消息。
  27. 根据权26所述的无线接入网设备，其特征在于，所述处理模块还用于，当所述终端设备当前的状态为轻连接态时，所述寻呼消息还携带终端设备的类型标识，所述类型标识用以指示终端设备进行寻呼时所使用的标识为临时移动台标识TMSI或者国际移动用户识别码IMSI。
  28. 一种终端设备，其特征在于，包括：
    接收模块，用于接收无线接入网设备发送的第二指示信息，所述第二指示信息为所述无线接入网设备根据所述终端设备当前所处的状态发送的，所述第二指示信息包括非接入层NAS消息或携带第一指示信息的寻呼消息，所述第一指示信息用于通知所述终端设备有来自 电路交换CS域的业务请求；
    处理模块，用于根据接收模块接收的第二指示信息确定发起业务请求流程。
  29. 根据权利要求28所述的终端设备，其特征在于，所述接收模块具体用于：
    如果所述终端设备当前所处的状态为连接态，接收无线接入网设备发送的第二指示信息包括NAS消息，所述NAS消息包括CS业务通知消息；或者
    如果所述终端设备当前所处的状态为轻连接态，接收无线接入网设备发送的第二指示信息包括携带第一指示信息的寻呼消息。
  30. 根据权利要求28或29所述的终端设备，其特征在于，所述处理模块具体用于：
    如果接收模块收到的第二指示信息包括携带第一指示信息的寻呼消息，且确定所述第一指示信息中的终端标识与所述终端设备自身的标识相同，所述根据第一指示信息中的CS域指示信息确定发起业务请求流程；或者，
    如果接收模块接收的收到第二指示信息包括NAS消息，根据所述NAS消息中包含的CS业务通知消息确定发起业务请求流程。
  31. 根据权利要求28所述的终端设备，其特征在于，所述接收模块接收的第二指示信息还携带终端设备的类型标识，用于指示终端设备进行寻呼时所使用的终端设备的标识。
  32. 根据权利要求31所述的终端设备，其特征在于，所述处理 模块还用于：
    确定CS域设备使用所述终端设备类型标识所对应的终端设标识寻呼所述终端设备；
    在后续的流程中，采用所述终端设备类型标识所对应的终端标识与CS域设备进行通信。
  33. 一种核心网设备，其特征在于，包括：
    接收模块，用于接收寻呼请求；
    处理模块，用于根据所述接收模块接收的寻呼请求生成非接入层NAS消息和携带第一指示信息的寻呼消息，所述第一指示信息用于通知终端设备有来自于电路交换CS域网络的业务请求；
    发送模块，用于向无线接入网设备发送NAS消息和第一指示信息，所述NAS消息或第一指示信息用于所述无线接入网设备根据终端设备当前所处的状态确定第二指示信息，所述第二指示信息包括NAS消息或携带第一指示信息的寻呼消息。
  34. 根据权利要求33所述的核心网设备，其特征在于，所述处理模块生成的第一指示信息包括CS域指示信息或者终端设备的NAS标识。
  35. 根据权利要求33或34所述的核心网设备，其特征在于，所述发送模块具体用于向无线接入网设备发送NAS信令传输消息，所述NAS信令传输消息携带NAS消息和第一指示信息。
  36. 根据权33所述的核心网设备，其特征在于，所述发送模块发送的所述NAS信令传输消息还携带终端设备的标识类型，用于指示 终端设备进行寻呼时所使用的终端设备的标识。
  37. 根据权利要求33至36任一权要所述的核心网设备，其特征在于，所述NAS消息包括CS业务通知消息。
  38. 根据权利要求33至37任一权要所述的核心网设备，其特征在于，所述核心网设备还包括：
    接收模块，接收无线接入网设备发送的通知消息，所述通知消息用于通知终端设备当前处于连接态或轻连接态。
  39. 一种信令传输系统，其特征在于，包括权利要求20至27任一权利要求所述的无线接入网设备、权利要求28至权32任一权利要求所述的终端设备和权利要求33至权37任一权利要求所述的核心网设备。
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