WO2016054822A1 - Csfb呼叫建立方法及装置 - Google Patents

Csfb呼叫建立方法及装置 Download PDF

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Publication number
WO2016054822A1
WO2016054822A1 PCT/CN2014/088395 CN2014088395W WO2016054822A1 WO 2016054822 A1 WO2016054822 A1 WO 2016054822A1 CN 2014088395 W CN2014088395 W CN 2014088395W WO 2016054822 A1 WO2016054822 A1 WO 2016054822A1
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WIPO (PCT)
Prior art keywords
user equipment
sgsn
base station
mme
request message
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PCT/CN2014/088395
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English (en)
French (fr)
Inventor
崇卫微
吴晓波
舒林
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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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 CN201480034278.9A priority Critical patent/CN105706518B/zh
Priority to PCT/CN2014/088395 priority patent/WO2016054822A1/zh
Publication of WO2016054822A1 publication Critical patent/WO2016054822A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup

Definitions

  • the embodiments of the present invention relate to communication technologies, and in particular, to a CSFB call establishment method and apparatus.
  • the second generation (Second Generation, 2G) and Third Generation (3G) networks such as Global System of Mobile communication (GSM) and Wideband Code Division Multiple Access (WCDMA) Basic coverage has been basically achieved.
  • GSM Global System of Mobile communication
  • WCDMA Wideband Code Division Multiple Access
  • LTE Long Term Evolution
  • the LTE network has covered some urban areas and traffic hotspots. Therefore, at present, The LTE network coexists with the 2G or 3G network in the communication network, wherein the LTE network is also called a Fourth Generation (4G) network.
  • 4G Fourth Generation
  • the LTE network is in the early stage of construction, the LTE network is not perfect.
  • the user equipment (User Equipment, UE) cannot establish a voice session because the LTE network does not support voice services.
  • UE User Equipment
  • Circuit Switched Fallback can solve the above problem that the LTE network does not support voice services and cannot establish a voice session.
  • the CSFB-enabled UE triggers the voice service in the LTE network and the LTE network does not support the voice service
  • the CSFB process can be first rolled back to the target 2G/3G network with a Circuit Switched (CS) domain. And continuing to process the voice service in the CS domain of the target 2G/3G network, thereby completing the establishment of the CS voice call.
  • the UE triggers a Packet Switching (PS) domain before the establishment of the CS voice call on the target network side or the establishment of the CS voice call, because the radio access type (RAT) of the UE changes.
  • Service requests such as Routing Area Update (RAU) requests.
  • RAU Routing Area Update
  • the existing CSFB scheme is compared with the CS voice service of the 2G/3G network or the voice service of the LTE network, and the time delay of the voice call establishment of the existing CSFB scheme is long.
  • Embodiments of the present invention provide a CSFB call establishment method and apparatus for improving voice call efficiency.
  • an embodiment of the present invention provides a circuit switching fallback CSFB call setup method, including:
  • the base station delays transmitting the PS NAS message to the general packet radio service technology service supporting node SGSN.
  • the base station delays sending the PS NAS message to a general packet radio service technology service supporting node SGSN, including:
  • the base station After receiving the PS NAS message from the base station, after the preset duration, the base station forwards the PS NAS message to the SGSN.
  • the base station delays sending the PS NAS message to a general packet radio service technology service supporting node SGSN, including:
  • the base station forwards the PS NAS message to the SGSN only after receiving the circuit switched radio bearer CS RB setup complete message sent by the user equipment.
  • the base station delays sending the PS NAS message to a general packet radio service technology service supporting node SGSN, including:
  • the base station forwards the PS NAS message to the SGSN only after determining that the circuit switched radio access bearer CS RAB is established or the CSFB call has entered a ringing state.
  • an embodiment of the present invention provides a circuit switching fallback CSFB call setup method, including:
  • the mobility management entity MME receives a context request message sent by the general packet radio service technology service support node SGSN, where the context request message is used to request to acquire context information of the user equipment; the user equipment is down to the second through the circuit switched fallback CSFB User equipment on behalf of 2G/third generation 3G network;
  • the MME delays sending context information of the user equipment to the SGSN.
  • the MME delays sending the context information of the user equipment to the SGSN, including:
  • the MME After receiving the context request message, the MME sends the context information of the user equipment to the SGSN after a preset duration.
  • the MME delays sending the context information of the user equipment to the SGSN, including:
  • the MME sends the context information of the user equipment to the SGSN only after determining that the CS RAB establishment of the user equipment is complete or the CSFB call of the user equipment has entered a ringing state.
  • an embodiment of the present invention provides a circuit switching fallback CSFB call setup method, including:
  • the general packet radio service technology service supporting node SGSN receives the packet switching non-access stratum PS NAS message initiated by the user equipment; wherein the user equipment is dropped back to the second generation 2G/third generation 3G network by the circuit switched fallback CSFB User equipment
  • the SGSN performs an uplink PS operation, where the uplink PS operation includes acquiring context information of the user equipment from a mobility management entity MME;
  • the SGSN delays performing a downlink PS operation, where the downlink PS operation is an interaction operation between the SGSN and the user equipment or the base station.
  • the SGSN delays performing a downlink PS operation, including:
  • the SGSN performs a downlink PS operation after receiving the PS NAS message or starting from determining that the user equipment is performing a CSFB call, after a preset duration.
  • an embodiment of the present invention provides an authentication method in a wireless communication system, including:
  • the mobility management entity MME receives a context request message sent by the general packet radio service technology service support node SGSN, where the context request message is used to request to acquire context information of the user equipment;
  • the MME delays sending context information of the user equipment to the SGSN to delay a packet switched PS domain authentication process of the user equipment.
  • the MME delays sending the context information of the user equipment to the SGSN, including:
  • the MME After receiving the context request message, the MME sends the context information of the user to the SGSN after a preset duration.
  • an embodiment of the present invention provides an authentication method in a wireless communication system, including:
  • the general packet radio service technology service supporting node SGSN receives the packet switched non-access stratum PS NAS message initiated by the user equipment;
  • the SGSN performs an uplink PS operation, where the uplink PS operation includes acquiring context information of the user equipment from a mobility management entity MME;
  • the SGSN delays sending a PS domain authentication request message to the user equipment to delay the PS domain authentication process of the user equipment.
  • the SGSN delays sending the PS domain authentication request message to the user equipment, including:
  • the SGSN After receiving the PS NAS message, the SGSN sends the PS domain authentication request message to the user equipment after a preset duration.
  • the method further includes:
  • an embodiment of the present invention provides a base station, including:
  • a receiving module configured to receive a packet switching non-access stratum PS NAS message sent by the user equipment, where the user equipment is a user equipment that is dropped back to the second generation 2G/third generation 3G network by the circuit switched fallback CSFB;
  • a delay module configured to delay sending the PS NAS message to the general packet radio service technology service supporting node SGSN.
  • the delay module is specifically configured to:
  • the receiving module After receiving the PS NAS message, the receiving module forwards the PS NAS message to the SGSN after a preset duration.
  • the delay module is specifically configured to:
  • the PS NAS message is forwarded to the SGSN only after receiving the circuit switched radio bearer CS RB setup complete message sent by the user equipment.
  • the delay module is specifically configured to:
  • the PS NAS message is forwarded to the SGSN only after determining that the circuit switched radio access bearer CS RAB setup is complete or the CSFB call has entered a ringing state.
  • the seventh aspect of the present invention provides a mobility management entity MME, including:
  • a receiving module configured to receive a context request message sent by the general packet radio service technology service supporting node SGSN, where the context request message is used to request to acquire context information of the user equipment; and the user equipment is returned to the CSFB via a circuit switched back to CSFB User equipment of the second generation 2G/third generation 3G network;
  • a delay module configured to delay sending the context information of the user equipment to the SGSN.
  • the delay module is specifically configured to:
  • the receiving module After receiving the context request message, the receiving module sends the context information of the user equipment to the SGSN after a preset duration.
  • the delay module is specifically configured to:
  • the context information of the user equipment is sent to the SGSN only after it is determined that the CS RAB establishment of the user equipment is completed or the CSFB call of the user equipment has entered a ringing state.
  • the eighth aspect of the present invention provides a general packet radio service technology service support node SGSN, including:
  • a receiving module configured to receive a packet switched non-access stratum PS NAS message initiated by the user equipment, where the user equipment is a user equipment that is dropped back to the second generation 2G/third generation 3G network by the circuit switched fallback CSFB;
  • An uplink operation module configured to perform an uplink PS operation, where the uplink PS operation includes acquiring context information of the user equipment from a mobility management entity MME;
  • a delay module configured to delay performing a downlink PS operation, where the downlink PS operation is an interaction operation between the SGSN and the user equipment or a base station.
  • the delay module is specifically configured to:
  • the downlink PS operation is performed.
  • a ninth aspect, the embodiment of the present invention provides a mobility management entity MME, including:
  • a receiving module configured to receive a context request message sent by the general packet radio service technology service supporting node SGSN, where the context request message is used to request to acquire context information of the user equipment;
  • a delay module configured to delay sending the context information of the user equipment to the SGSN to delay a packet switched PS domain authentication process of the user equipment.
  • the delay module is specifically configured to:
  • the receiving module After receiving the context request message, the receiving module sends the context information of the user to the SGSN after a preset duration.
  • the tenth aspect of the present invention provides a general packet radio service technology service support node SGSN, including:
  • a receiving module configured to receive a packet switched non-access stratum PS NAS message initiated by the user equipment
  • An uplink operation module configured to perform an uplink PS operation, where the uplink PS operation includes acquiring context information of the user equipment from a mobility management entity MME;
  • a delay module configured to delay sending a PS domain authentication request message to the user equipment, to delay a PS domain authentication process of the user equipment.
  • the delay module is specifically configured to:
  • the receiving module After receiving the PS NAS message, the receiving module sends the PS domain authentication request message to the user equipment after a preset duration.
  • the SGSN further includes:
  • a determining module configured to determine whether the user equipment is a user equipment from a long term evolution LTE network, and when determining that the user equipment is a user equipment from a long term evolution LTE network, the delay module delays sending a PS to the user equipment
  • the domain authentication request message is used to delay the PS domain authentication process of the user equipment.
  • the base station receives the packet-switched non-access stratum PS NAS message sent by the user equipment; wherein the user equipment is a user equipment that is dropped back to the second-generation 2G/third-generation 3G network by the circuit-switched fallback CSFB; further
  • the base station delays the general packet radio service technology service
  • the supporting node SGSN sends the PS NAS message, thereby delaying the establishment of the PS RAB, ensuring that the PS service flow does not affect the establishment of the CS call, thereby reducing the call setup time to improve the voice call efficiency.
  • FIG. 1 is a flowchart of a method for establishing a CSFB call according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a method for establishing a CSFB call according to an embodiment of the present invention
  • FIG. 3 is a flowchart of a method for establishing a CSFB call according to an embodiment of the present invention
  • FIG. 4 is a flowchart of a method for establishing a CSFB call according to an embodiment of the present invention
  • FIG. 5 is a flowchart of an authentication method in a wireless communication system according to an embodiment of the present invention.
  • FIG. 6 is a flowchart of an authentication method in a wireless communication system according to an embodiment of the present invention.
  • FIG. 7 is a flowchart of a method for establishing a CSFB call according to an embodiment of the present invention.
  • FIG. 8 is a flowchart of a method for establishing a CSFB call according to an embodiment of the present invention.
  • FIG. 9 is a flowchart of a method for establishing a CSFB call according to an embodiment of the present invention.
  • FIG. 10 is a flowchart of a method for establishing a CSFB call according to an embodiment of the present invention.
  • FIG. 11 is a flowchart of a method for establishing a CSFB call according to an embodiment of the present invention.
  • FIG. 12 is a flowchart of a method for establishing a CSFB call according to an embodiment of the present invention.
  • FIG. 13 is a schematic diagram of a base station according to an embodiment of the present disclosure.
  • FIG. 14 is a schematic diagram of a base station according to an embodiment of the present disclosure.
  • FIG. 15 is a schematic diagram of an MME according to an embodiment of the present disclosure.
  • FIG. 16 is a schematic diagram of an MSC according to an embodiment of the present invention.
  • FIG. 17 is a schematic diagram of an SGSN according to an embodiment of the present disclosure.
  • FIG. 18 is a schematic diagram of still another MME according to an embodiment of the present disclosure.
  • FIG. 19 is a schematic diagram of still another SGSN according to an embodiment of the present invention.
  • the existing 2G/3G core network usually consists of a PS domain and a CS domain.
  • the voice and other CS supplementary services are supported by the CS domain.
  • the LTE core network does not include the CS domain and only the PS domain. Therefore, it is called an evolved packet.
  • Evolved Packet System EPS
  • the LTE network In order to provide voice services, the LTE network must include an IP multimedia subsystem (IMS), and the IMS is a session control layer. Therefore, the voice service in the LTE/EPS system is called IMS voice over IP (VoIP). ) Service or LTE-based voice (VoLTE) service.
  • the LTE network is in the early stage of construction, the deployment of the LTE network and the IMS system is not perfect, that is, there are not many LTE networks supporting the IMS VoIP service.
  • the UE may not support the IMS in the VoIP network during the establishment of the voice call. VoIP service cannot establish a voice conversation.
  • FIG. 1 is a flowchart of a method for establishing a CSFB call according to an embodiment of the present invention. As shown in FIG. 1 , the method in this embodiment may include:
  • the base station receives a packet switched non-access stratum PS NAS message sent by the user equipment.
  • the user equipment that is dropped back to the second generation 2G/third generation 3G network by the circuit domain exchange fallback CSFB sends a call setup (SET UP) message to the network side mobile switching center (MSC).
  • the MSC After receiving the call setup message, the MSC requires the base station to allocate a reasonable circuit switched radio access bearer (CS RAB) to the user equipment; on the other hand, the RAT of the user equipment changes.
  • the user equipment may trigger a PS domain service request, such as a RAU request.
  • the base station may receive the packet exchange sent by the user equipment to the packet core network device.
  • the packet core network device may be a Serving GPRS Support Node (SGSN)
  • SGSN Serving GPRS Support Node
  • the base station may be a base station controller (BSC)/radio network controller (RNC), and the user equipment may be a UE/mobile station (MS).
  • BSC base station controller
  • RNC radio network controller
  • MS UE/mobile station
  • the base station delays sending the PS NAS message to a general packet radio service technology service supporting node SGSN.
  • the base station delays the establishment of the PS RAB by delaying the sending of the PS NAS message to the GPRS service supporting node SGSN, and ensures that the CS RAB is established before the PS RAB. success.
  • the base station may forward the PS NAS message to the SGSN after receiving the PS NAS message for a preset duration, for example, by triggering a timer until the timer reaches a preset.
  • the PS NAS message is sent to the SGSN after the duration.
  • the method further includes:
  • the base station determines that the user equipment is performing a CSFB call, and may adopt any one of the following:
  • the first implementation manner is: the base station determines, according to the first CS NAS message sent by the user equipment, that the user equipment is performing a CSFB call, for example, by parsing the first CS NAS message, determining the user equipment.
  • the CSFB call is in progress, wherein the first CS NAS message includes but is not limited to: a location area update request message and/or a connection management service request message, and the location area update request message is that the user equipment falls back to 2G/3G.
  • the connection management service request message is sent to the mobile switching center MSC by the base station after the user equipment falls back to the 2G/3G network and in the calling scenario.
  • the second implementation manner is: the base station determines, according to the paging response message sent by the user equipment, that the user equipment is performing a CSFB call, and optionally, by parsing the paging response message, determining The user equipment is performing a CSFB call, where the paging response message is after the user equipment falls back to the 2G/3G network and is in the called scene.
  • the third achievable manner is that the base station determines that the user equipment is performing a CSFB call according to a Radio Resource Control (RRC) connection establishment request message sent by the user equipment, where
  • RRC connection setup request message is a message that is sent to the base station after the user equipment falls back to the 2G/3G network, where the RRC connection setup request message is used to request to establish an RRC connection, optionally, the RRC connection setup request message.
  • RRC Radio Resource Control
  • the base station receives the PS NAS message sent by the user equipment, where the user equipment is a user equipment that is dropped back to the second generation 2G/third generation 3G network by the circuit switched back CSFB; further, the The base station delays sending the PS NAS message to the SGSN, thereby delaying The establishment of the late PS RAB ensures that the PS service flow does not affect the establishment of the CS call, thereby reducing the call setup time to improve the voice call efficiency.
  • the method further includes:
  • CS RAB allocation request sent by the MSC, where the CS RAB allocation request is used to indicate that the base station establishes a radio access bearer between the user equipment and the MSC; wherein the CS RAB allocation Requesting a request sent by the MSC after receiving a call setup message sent by the user equipment.
  • the base station allocates a CS RAB to the user equipment after receiving the CS RAB allocation request sent by the MSC, where the CS RAB allocation request is used to indicate that the base station is in the user Establishing a radio access bearer between the device and the MSC; wherein the CS RAB allocation request is a request sent by the MSC after receiving a call setup message sent by the user equipment.
  • the base station delays sending the PS NAS message to the general packet radio service technology service supporting node SGSN, and may adopt any one of the following:
  • the first implementation manner is: after the base station receives the PS NAS message, after the preset duration, the base station forwards the PS NAS message to the SGSN.
  • the base station forwards the PS NAS message to the SGSN only after receiving the circuit switched radio bearer CS RB setup complete message sent by the user equipment;
  • a third implementation manner the base station forwards the PS NAS message to the SGSN only after determining that the circuit switched radio access bearer CS RAB is established or the CSFB call has entered a ringing state.
  • the base station in order to prevent the PS service flow from affecting the establishment of the CS call, starts forwarding to the SGSN after receiving the PS NAS message and after a preset duration.
  • the PS NAS message optionally, the preset duration is greater than or equal to a setup duration of the circuit switched radio access bearer CS RAB of the user equipment, or greater than or equal to a setup duration of the CSFB call, thereby delaying the PS RAB.
  • the preset duration is greater than or equal to a setup duration of the circuit switched radio access bearer CS RAB of the user equipment, or greater than or equal to a setup duration of the CSFB call, thereby delaying the PS RAB.
  • the base station may: after the first timer reaches a preset duration of the first timer, the base station forwards the PS NAS message to the SGSN, where The preset duration of the first timer is greater than or equal to the circuit switching of the user equipment.
  • the establishment time of the radio access bearer CS RAB is greater than or equal to the establishment duration of the CSFB call.
  • the preset duration of the first timer may be designed according to the routing area update RAU timer duration of the user equipment, and the first timer is pre-processed if the RAU process does not expire.
  • the duration of the first timer is less than the route of the user equipment.
  • the preset duration of the first timer is less than the route of the user equipment.
  • the base station in order to prevent the PS service flow from affecting the establishment of the CS call, the base station does not forward the PS NAS message to the SGSN until the base station receives the user.
  • the base station forwards the PS NAS message to the SGSN, thereby delaying the establishment of the PS RAB and ensuring that the CS RAB precedes the PS.
  • the RAB was successfully established.
  • the CS RB setup complete message is a message that is sent by the user equipment to the base station after receiving the CSRB setup request message sent by the base station, where the CS RB setup request message includes the base station The associated CS domain wireless air interface resource allocated by the user equipment.
  • the base station in order to prevent the PS service flow from affecting the establishment of the CS call, the base station does not forward the PS NAS message to the SGSN until the base station determines the circuit switched wireless connection.
  • the base station forwards the PS NAS message to the SGSN, thereby delaying establishment of the PS RAB, and ensuring that the CS RAB is successfully established before the PS RAB.
  • the base station determines, by using the second CS NAS message, that the CS RAB establishment is complete or the CSFB call has entered a ringing state.
  • the second CS NAS message includes but is not limited to: ringing. Message or session confirmation message.
  • FIG. 2 is a flowchart of a method for establishing a CSFB call according to an embodiment of the present invention. As shown in FIG. 2, the method in this embodiment may include:
  • the mobility management entity MME receives a context request message sent by the general packet radio service technology service supporting node SGSN.
  • the user equipment that is dropped back to the second generation 2G/third generation 3G network by the circuit domain exchange fallback CSFB sends a SET UP message to the network side MSC, and the MSC requests the base station after receiving the SET UP message.
  • the user equipment may initiate a PS to the PS core network device SGSN at any time.
  • a service flow such as RAU, etc.
  • the SGSN requests a Mobility Management Entity (MME) of the original network side of the user equipment to acquire a context of the user equipment, to learn the user.
  • MME Mobility Management Entity
  • the mobility management entity MME may receive the context request message sent by the GPRS service supporting node SGSN.
  • the context request message is used to request to obtain context information of the user equipment.
  • the context information of the user equipment includes at least one of the following: an international mobile subscriber identity of the user (International Mobile Subscriber Identification Number (IMSI) information, Evolved Packet System (EPS) bearer context information and security key information.
  • IMSI International Mobile Subscriber Identification Number
  • EPS Evolved Packet System
  • the MME delays sending the context information of the user equipment to the SGSN.
  • the MME when the SGSN cannot obtain the context information of the user equipment, the PS service process is suspended.
  • the MME sends the foregoing to the SGSN by delay.
  • the manner of the context information of the user equipment delays the PS service flow initiated by the user equipment, that is, delays the establishment of the PS RAB, and ensures that the CS RAB is successfully established before the PS RAB.
  • the MME may start sending the context information of the user equipment to the SGSN after receiving the context request message, for example, by triggering a timer until the timer reaches After the preset duration, the context information of the user equipment is sent to the SGSN.
  • the method further includes: the MME determining that the user equipment is performing a CSFB call.
  • the manner in which the MME determines whether the user equipment corresponding to the context request message is performing a CSFB call is as follows: the MME may be configured to receive an extended service request initiated by the user equipment. Recording, by the user equipment, the CSFB call and the user identifier of the user equipment, when receiving the context request message sent by the SGSN, the MME queries the MME according to the user identifier included in the context request message.
  • the MME receives the context request message sent by the SGSN, where the context request message is used to request to obtain the context information of the user equipment, and the user equipment falls back to the second generation 2G through the circuit switchback CSFB.
  • a user equipment of the third generation 3G network further, the MME delays sending the context information of the user equipment to the SGSN, thereby delaying establishment of the PS RAB, ensuring that the PS service flow does not affect the establishment of the CS call, thereby reducing Call setup time is long to improve voice call efficiency.
  • the method further includes:
  • the MME receives non-access stratum NAS signaling sent by the user equipment, where the NAS signaling is used to trigger a CSFB call;
  • the MME sends a notification message to the evolved network base station eNodeB, where the notification message is used to notify the eNodeB that the user equipment has initiated a CSFB call.
  • the MME receives NAS signaling (such as an extended service request) sent by the user equipment to trigger a CSFB call, and further, the MME sends an E-UTRAN NodeB (eNodeB) to an evolved network base station (eNodeB).
  • eNodeB E-UTRAN NodeB
  • eNodeB evolved network base station
  • Sending a notification message optionally, the notification message may be an S1-Application Protocol (S1-AP) request message, where the S1-AP request message includes the information about the eNodeB
  • S1-AP S1-Application Protocol
  • the MME may delay sending the context information of the user equipment to the SGSN, and may adopt any one of the following implementation manners:
  • the first achievable manner the MME sends the context information of the user equipment to the SGSN after receiving the context request message and after a preset duration
  • the second implementation manner is that the MME sends the context information of the user equipment to the SGSN only after determining that the CS RAB establishment of the user equipment is complete or the CSFB call of the user equipment has entered the ringing state.
  • the MME in order to prevent the PS service flow from affecting the establishment of the CS call, the MME starts sending the context request message, and after sending the preset time length, sends the location to the SGSN.
  • Context information of the user equipment optionally, the preset duration is greater than or equal to the establishment duration of the circuit-switched radio access bearer CS RAB of the user equipment, or greater than or equal to the establishment duration of the CSFB call of the user equipment, thereby Delay the establishment of PS RAB, guarantee The CS RAB was successfully established prior to the PS RAB.
  • the MME may send the second timer, and after the second timer reaches the preset duration of the second timer, the MME sends the context information of the user equipment to the SGSN.
  • the preset duration of the second timer is greater than or equal to the establishment duration of the circuit-switched radio access bearer CS RAB of the user equipment, or greater than or equal to the establishment duration of the CSFB call of the user equipment.
  • the preset duration of the second timer may also be designed according to the routing area update RAU timer of the user equipment and the duration of the timer in the SGSN for supervising the context request process, where the RAU is satisfied.
  • the preset duration of the second timer should be long enough to ensure that the CSFB call of the user equipment has entered the ringing state or at least the CS RAB is set to expire after the process is complete.
  • the preset duration is less than a routing area update RAU timer duration of the user equipment and the timer duration in the SGSN.
  • the MME does not send the context information of the user equipment to the SGSN, until the MME determines that the PS service process does not affect the establishment of the CS call.
  • the MME sends the context information of the user equipment to the SGSN, thereby delaying the establishment of the PS RAB and guaranteeing the CS RAB. Established successfully before the PS RAB.
  • the MME may determine, according to the notification message sent by the mobile switching center MSC, that the CS RAB establishment of the user equipment is complete or that the CSFB call of the user equipment has entered a ringing state, where the notification message is The message sent by the MSC after determining that the CS RAB establishment is completed or the CSFB call has entered a ringing state, the notification message is used to inform the MME of the CSFB call state, so that the MME knows the status of the CSFB call.
  • the served MSC can sense the status of the CSFB call, such as whether the CS RAB is successfully established, whether the CSFB call enters the ringing state, or whether the CSFB call enters. a call state or the like; when the MSC senses that the CSFB call has entered a ringing state or at least the CS RAB has been established, the MSC sends a notification message to the MME through the SGs/Sv interface, the notification message is used to inform the MME The state of the circuit domain call.
  • FIG. 3 is a flowchart of a method for establishing a CSFB call according to an embodiment of the present invention. As shown in FIG. 3, the method in this embodiment may include:
  • the mobile switching center MSC acquires a circuit switched fallback CSFB call state.
  • the served MSC It is possible to obtain the CSFB call status, such as whether the CS RAB is successfully established, whether the CSFB call enters the ringing state, or whether the CSFB call enters the call state, etc., optionally, the way in which the MSC obtains the CSFB call state is: by analyzing the CS NAS of the call process Information to obtain CSFB call status, such as ringing messages or session confirmation messages, etc.
  • the MSC determines that the CS RAB establishment is completed or the CSFB call has entered a ringing state
  • the MSC sends a notification message to the mobility management entity MME.
  • the MSC sends a notification message for informing the MME of the CSFB call state to the MME.
  • the MSC Sending the notification message to the MME by using an SGs/Sv interface, so that when the MME learns that the CSFB call has entered a ringing state or the CS RAB has been established, the waiting is stopped, and the context of the user equipment is The information is sent to the SGSN, thereby delaying the establishment of the PS RAB, and ensuring that the CS RAB is successfully established prior to the PS RAB.
  • the mobile switching center MSC acquires a circuit switched fallback CSFB call state; further, when the MSC determines that the CS RAB establishment is completed or the CSFB call has entered a ringing state, the MSC moves to the mobility management entity MME. Sending a notification message, wherein the notification message is used to notify the MME CS of a call state, so that when the MME learns that the CSFB call has entered a ringing state or the CS RAB has been established, the waiting is stopped, and the The context information of the user equipment is sent to the SGSN, thereby delaying the establishment of the PS RAB, and ensuring that the CS RAB is successfully established before the PS RAB.
  • FIG. 4 is a flowchart of a method for establishing a CSFB call according to an embodiment of the present invention. As shown in FIG. 3, the method in this embodiment may include:
  • the general packet radio service technology service supporting node SGSN receives the packet switching non-access stratum PS NAS message initiated by the user equipment.
  • the user equipment that is dropped back to the second generation 2G/third generation 3G network by the circuit domain exchange fallback CSFB sends a SET UP message to the network side MSC, and the MSC requests the base station after receiving the SET UP message.
  • a reasonable CS RAB is allocated to the user equipment.
  • the user equipment may initiate a PS service flow (such as RAU, etc.) to the PS core network device SGSN at any time.
  • the basic packet radio service technology service supporting node SGSN may receive the packet initiated by the user equipment before the base station allocates the CS RAB for the user equipment or when the base station allocates the CS RAB to the user equipment.
  • Exchange non-access Layer PS NAS message may be exchange non-access Layer PS NAS message.
  • the SGSN performs an uplink PS operation, where the uplink PS operation includes acquiring context information of the user equipment from a mobility management entity MME.
  • the SGSN when the SGSN receives the first PS NAS message sent by the user equipment, the SGSN normally performs an uplink PS operation, where the uplink PS operation is an SGSN and
  • the core network nodes include, but are not limited to, an MME, a Home Subscriber Server (HSS), and a Generalized Packet Satellite Network (GPSN).
  • the uplink PS operation includes acquiring the context information of the user equipment from the mobility management entity MME.
  • the uplink PS operation further includes: acquiring the subscription data/authentication of the user equipment to the home subscriber server HSS. Data, or update location information in the HSS, or establish/update general packet radio service technology tunneling protocol GTP bearer information.
  • the SGSN delays performing a downlink PS operation, where the downlink PS operation is an interaction operation between the SGSN and the user equipment or a base station.
  • the SGSN delays performing the downlink PS operation of the PS service, where the downlink PS operation is the SGSN and the user equipment or the base station. The interaction between them delays the establishment of the PS RAB and ensures that the CS RAB is successfully established before the PS RAB.
  • the downlink PS operation includes: sending a routing area update RAU request accept message to the user equipment, or sending a request message to the base station, where the request message is used to request the base station to allocate the user equipment
  • the packet switched radio access carries the PS RAB.
  • the SGSN may start a downlink PS operation after receiving the PS NAS message or from determining that the user equipment is performing a CSFB call, and after performing a preset duration, for example, by triggering a timer until the SGSN After the timer reaches the preset duration, the downlink PS operation is performed to ensure that the PS service flow does not affect the establishment of the CS call.
  • the preset duration is greater than or equal to a setup duration of the circuit switched radio access bearer CS RAB of the user equipment, or greater than or equal to a setup duration of the CSFB call.
  • the SGSN may perform a downlink PS operation after the third timer reaches a preset duration of the third timer by using a third timer, optionally, the third timer
  • the preset duration is greater than or equal to the establishment duration of the circuit switched radio access bearer CS RAB of the user equipment, or greater than or equal to the establishment duration of the CSFB call.
  • the preset duration of the third timer may be designed according to the routing area update RAU timer duration of the user equipment, and the third timer is pre-processed if the RAU process does not expire. The time length should be long enough to ensure that the CSFB call of the user equipment has entered the ringing state or at least the CS RAB establishment timeout expires.
  • the preset duration is less than the routing area update RAU timer of the user equipment. duration.
  • the method further includes: the SGSN determining that the user equipment is performing a circuit switched fallback CSFB call.
  • the SGSN may determine, according to the context information of the user equipment, that the user equipment is performing a CSFB call.
  • the SGSN receives the PS NAS message initiated by the user equipment, where the user equipment is a user equipment that is dropped back to the 2G/3G network by the circuit switchback CSFB; further, the SGSN performs an uplink PS operation,
  • the uplink PS operation includes acquiring context information of the user equipment to the mobility management entity MME; the SGSN delays performing a downlink PS operation, thereby delaying establishment of the PS RAB, ensuring that the PS service flow does not affect the establishment of the CS call, thereby reducing Call setup time is long to improve voice call efficiency.
  • FIG. 5 is a flowchart of a method for authenticating a wireless communication system according to an embodiment of the present invention. As shown in FIG. 5, the method in this embodiment may include:
  • the mobility management entity MME receives a context request message sent by the general packet radio service technology service supporting node SGSN.
  • the LTE network may not support the voice service and may need to go back to the 2G/3G network via the CSFB to initiate the CS voice service.
  • the PS domain process may be initiated by the base station to the core network node SGSN, such as the PS attach procedure and/or Or the RAU process or the like; further, the SGSN, after receiving the PS NAS message sent by the UE by the base station, such as an attach request message and/or a RAU request message, initiates a request to acquire the user to the original MME.
  • Context request message of the device context information that is, the user equipment is connected to the 2G/3G network from the LTE network.
  • the context information of the user equipment includes at least one of the following information: IMSI information, EPS Carry context information and security key information.
  • the MME delays sending the context information of the user equipment to the SGSN.
  • the PS domain authentication process is delayed by the packet exchange of the user equipment.
  • the SGSN and the MSC of the 3G/2G network respectively initiate an authentication process to the user equipment to identify the identity of the user equipment and negotiate a security key, where
  • the carrier configuration factor such as the L value is set too small
  • the authentication process of the CS domain and the PS domain may not be synchronized, which may cause the synchronization detection (SQN detection) process in the CS domain authentication process to fail.
  • the SGSN initiates an authentication process to the user equipment after receiving the context information of the user equipment.
  • the MME delays sending the context information of the user equipment to the SGSN, and when the SGSN fails to obtain the context information of the user equipment, the PS service flow is suspended, where the PS service flow includes the PS domain
  • the rights process so that the CS domain authentication process included in the CS domain business process can be executed first.
  • the MME sends the context information of the user equipment to the SGSN by delay, causing the SGSN to delay initiating a PS domain authentication request message to the user equipment, thereby delaying the user equipment.
  • the PS domain authentication process that is, the user equipment completes the authentication process of the CS domain after switching from LTE to 3G/2G, thereby ensuring that the CS domain service is not affected.
  • the manner in which the MME delays sending the user equipment context information to the SGSN may be: the MME starts sending the context request message, and after sending the preset time length, sends the context information of the user to the SGSN.
  • the preset duration is configured according to the length of time required by the mobile switching center MSC to perform the circuit-switched CS domain authentication process of the user equipment.
  • the preset duration is greater than the CS domain authentication.
  • the duration of the process is configured.
  • the preset duration is configured according to the duration of the corresponding PS service timer in the user equipment or the duration of the timer in the SGSN for supervising the context request process.
  • the preset duration is less than the duration of the corresponding PS service timer in the user equipment or less than the duration of the timer in the SGSN for supervising the context request procedure; preferably, the preset duration
  • the duration of the CS domain authentication process is greater than the duration of the corresponding PS service timer in the user equipment or the timer in the SGSN for supervising the context request process. duration.
  • the MME may send a context response message to the SGSN by using a trigger timer, where the context response message carries the context information of the user equipment.
  • the timer duration may be according to a length of time required for the circuit switching CS domain authentication process of the user equipment by the mobile switching center MSC, and a corresponding PS service timer (such as RAU) in the user equipment.
  • the duration of the timer used by the SGSN to supervise the context request process is configured.
  • the timer time may be long enough if the PS service process and the SGSN context acquisition process sent by the user equipment are not timed out. To ensure that the timer expires after the UE initiated CS service flow has been completed or at least the CS domain authentication process has been completed.
  • FIG. 6 is a flowchart of a method for authenticating a wireless communication system according to an embodiment of the present invention. As shown in FIG. 6, the method in this embodiment may include:
  • the general packet radio service technology service supporting node SGSN receives the packet switching non-access stratum PS NAS message initiated by the user equipment.
  • the PS NAS message can be initiated by the base station to the core network node SGSN at any time.
  • a PS domain procedure such as a PS attach procedure and/or a RAU procedure, etc., that is, the SGSN may receive a packet switched non-access stratum PS NAS message initiated by the user equipment.
  • the SGSN performs an uplink PS operation, where the uplink PS operation includes acquiring context information of the user equipment from a mobility management entity MME.
  • the SGSN may perform an uplink PS operation normally, where the uplink PS operation is an interaction operation between the SGSN and a core network node.
  • the uplink PS operation includes acquiring the context information of the user equipment from the mobility management entity MME.
  • the uplink PS operation further includes: acquiring the subscription data/authentication data of the user equipment, or updating the location of the user equipment to the HSS. The location information in the HSS.
  • the SGSN delays sending a PS domain authentication request message to the user equipment to delay the PS domain authentication process of the user equipment.
  • the SGSN delays sending a PS domain authentication request message to the user equipment to delay the operation of the PS domain authentication process, thereby preventing the PS domain authentication process from interfering with the CS domain authentication process to ensure CS
  • the domain authentication process is executed preferentially, so as to avoid the problem that the user equipment cannot perform the CS voice service due to the failure to authenticate through the CS domain.
  • the manner in which the SGSN delays sending the PS domain authentication request message to the user equipment may be: the SGSN may start from receiving the PS NAS message, after a preset duration, Sending the PS domain authentication request message to the user equipment, optionally, the preset duration is configured according to the required length of the circuit switched CS domain authentication process of the user equipment by the mobile switching center MSC, optionally The preset duration is greater than the duration of the CS domain authentication process; optionally, the preset duration is configured according to the duration of the corresponding PS service timer in the user equipment, optionally, The preset duration is smaller than the duration of the corresponding PS service timer in the user equipment.
  • the preset duration is greater than the length of time required by the CS domain authentication process, and is smaller than the corresponding PS service in the user equipment.
  • the duration of the timer is greater than the length of time required by the CS domain authentication process, and is smaller than the corresponding PS service in the user equipment.
  • the duration of the timer may be based on a length of time required by the mobile switching center MSC to perform a circuit-switched CS domain authentication process on the user equipment, and a corresponding PS service timer (such as a RAU) in the user equipment.
  • the duration of the process timer is configured, and the timer time may be long enough to ensure that the CS service process initiated by the user equipment is completed or at least CS, if the PS service process sent by the user equipment does not expire.
  • the timer expires after the domain authentication process has been completed.
  • the SGSN delays the PS domain authentication process by delaying the sending of the PS domain authentication request message to the user equipment, that is, the user equipment completes the CS domain after switching from LTE to 3G/2G.
  • the authentication process ensures that the CS domain services are not affected.
  • the method further includes: determining, by the SGSN, whether the user equipment is a user equipment from a long-term evolution LTE network, when determining When the user equipment is a user equipment from the LTE-LTE network, the UE sends a PS domain authentication request message to the user equipment to delay the PS domain authentication process of the user equipment.
  • the SGSN may determine, according to the parsing the PS NAS message sent by the user equipment, whether the user equipment is a user equipment from a long term evolution LTE network, optionally, the The PS NAS message sent by the user equipment may be a RAU request message or an attach request message; further, when it is determined that the user equipment is a user equipment from a long term evolution LTE network, the SGSN sends the user equipment by delay The PS domain authentication request message is used to delay the PS domain authentication process of the user equipment.
  • FIG. 7 is a flowchart of a CSFB call setup method according to an embodiment of the present invention.
  • a UE sends a NAS signaling (such as an extended service request message) to an MME on an LTE network side
  • the MME sends an S1-AP request message to the eNodeB, where the S1-AP request message includes indication information, where the indication information is used to notify the eNodeB that the UE has initiated a CSFB call;
  • the eNodeB triggers the UE to change the access type (that is, reselects the network for the UE) by means of Network Assisted Cell Change (NACC) or RRC connection release, and optionally,
  • NACC Network Assisted Cell Change
  • the RAT of the UE is changed from an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) to a Universal Terrestrial Radio Access Network (UTRAN)/Global System for Mobile Communications/Enhanced Data Rate GSM/EDGE Radio Access Network (GERAN)
  • the BSC/RNC may determine whether the circuit domain call initiated by the UE is caused by CSFB by parsing the connection management service request message or the location area update request message, or the BSC/RNC may also parse the paging response message in the called scenario.
  • the UE Determining whether the UE-initiated circuit domain call is caused by CSFB; further, since the RAT of the UE is changed, the UE sends a PS NAS message to the SGSN via the BSC/RNC, when the BSC/RNC receives the PS NAS message and determines the When the UE is in the CSFB call, the BSC/RNC forwards the PS NAS message to the SGSN after the timeout, and delays the establishment of the PS RAB to ensure that the CS RAB is successfully established before the PS RAB.
  • the The preset duration of the first timer may be designed according to the routing area update RAU timer duration of the UE, and the first timing is satisfied if the RAU process does not expire.
  • the preset duration should be long enough to ensure that the CSFB call of the UE has entered the ringing state or at least after the CS RAB establishment is completed; on the other hand, the UE sends a call setup message to the network side MSC, and the MSC receives the message.
  • the BSC/RNC is required to allocate a suitable CSRAB to the UE, and the subsequent MSC and other network side devices process the session initiated by the calling UE, for example, sending a session request to the called UE,
  • the calling UE triggers ringing when receiving the session request and sends a ring back tone to the calling UE. When the calling UE hears the ring back tone, the entire CS session is successfully established.
  • FIG. 8 is a flowchart of a method for establishing a CSFB call according to an embodiment of the present invention.
  • a UE sends a NAS signaling (such as an extended service request message) to an MME on an LTE network side to trigger a CSFB process
  • the MME sends an S1-AP request message to the eNodeB, where the S1-AP request message includes indication information, where the indication information is used to notify the eNodeB that the UE has initiated a CSFB call; further, the eNodeB
  • the UE is configured to change the access type by using the NACC or the RRC connection release mode, that is, to reselect the network for the UE.
  • the RAT of the UE is changed from the E-UTRAN to the UTRAN/GERAN, so that the UE falls back.
  • the UE that supports CSFB and has dropped back to the 2G/3G network sends an RRC Connection Setup Request message to the BSC/RNC, and the UE sends a connection to the network side MSC via the BSC/RNC.
  • the BSC/RNC may determine whether the RRC setup request is caused by the CSFB by using the CSFB indication information included in the RRC connection setup request message, or the BSC/RNC may parse the connection management service request message by Or location area
  • the request message determines whether the circuit domain call initiated by the UE is caused by CSFB, or the BSC/RNC may also determine whether the circuit domain call initiated by the UE is caused by CSFB by parsing the paging response message in the called scenario; further, due to the UE The RAT is changed, and the UE sends a PS NAS message to the SGSN via the BSC/RNC.
  • the BSC/RNC When the BSC/RNC receives the PS NAS message and determines that the UE is in a CSFB call, the BSC/RNC does not forward the station to the SGSN.
  • the PS NAS message is forwarded until the base station receives the CS RB setup complete message sent by the UE, and then forwards the PS NAS message to the SGSN, thereby delaying establishment of the PS RAB, and ensuring that the CS RAB is successfully established before the PS RAB.
  • the UE sends a call setup message to the network side MSC, and after receiving the call setup message, the MSC sends a CS RAB Assignment Request message to the BSC/RNC to request the BSC/RNC to allocate the appropriate UE to the UE.
  • the CS RAB the BSC/RNC sends a CS RB setup request message to the UE, where the CS RB setup request message includes the relevant CS domain wireless air interface resource allocated by the base station to the UE, and the UE receives the CS RB establishment please After the message, the CS RB setup complete message is sent to the BSC/RNC, and the BSC/RNC considers that the CS RAB is established and returns an allocation response message to the MSC; further, the subsequent MSC and other network side devices initiate the call to the calling UE.
  • the session is processed, for example, the session request is sent to the called UE, and the called UE triggers ringing when receiving the session request and sends a ring back tone to the calling UE, wherein when the calling UE hears the ring back tone, the whole The CS session was established successfully.
  • FIG. 9 is a flowchart of a method for establishing a CSFB call according to an embodiment of the present invention, as shown in FIG.
  • the MME sends an S1-AP request message to the eNodeB, where the S1-AP request message is sent.
  • the indication information is used to notify the eNodeB that the UE has initiated a CSFB call; further, the eNodeB triggers the UE to change the access type by means of NACC or RRC connection release, etc.
  • the UE may send an RRC connection setup request message to the BSC/RNC, and the UE sends a connection management service request or a location area update request message to the network side MSC via the BSC/RNC.
  • the BSC/RNC may connect through the RRC.
  • the CSFB indication information included in the setup request message determines whether the RRC setup request is caused by the CSFB, or the BSC/RNC can determine whether the circuit domain call initiated by the UE is determined by the CSF by parsing the connection management service request message or the location area update request message.
  • the BSC/RNC may also determine whether the UE-initiated circuit domain call is caused by CSFB by parsing the paging response message; further, since the RAT of the UE is changed, the UE passes the BSC/RNC direction.
  • the SGSN sends a PS NAS message.
  • the BSC/RNC When the BSC/RNC receives the PS NAS message and determines that the UE is in a CSFB call, the BSC/RNC does not forward the PS NAS message to the SGSN until the base station resolves.
  • the CS NAS message (such as a ringing message, a session confirmation message, etc.) determines that the PS NAS message is forwarded to the SGSN immediately after the CS RAB establishment is completed or the CSFB call has entered the ringing state, thereby delaying the establishment of the PS RAB, Ensure that the CS RAB is successfully established before the PS RAB; on the other hand, the UE sends a call setup message to the network side MSC, and the MSC requests the BSC/RNC to allocate the appropriate CS RAB to the UE after receiving the call setup message.
  • the subsequent MSC and other network side devices process the session initiated by the calling UE. For example, if the session request is sent to the called UE, the called UE triggers ringing when receiving the session request and sends a ringback to the calling UE. Tone, where, when the calling UE When the ringback tone is heard, the entire CS session is established successfully.
  • FIG. 10 is a flowchart of a method for establishing a CSFB call according to an embodiment of the present invention.
  • a UE sends a NAS signaling (such as an extended service request message) to an MME on an LTE network side to trigger a CSFB process
  • the MME sends an S1-AP request message to the eNodeB, where the S1-AP request message includes indication information, where the indication information is used to notify the eNodeB that the UE has initiated a CSFB call; further, the eNodeB By NACC or The RRC connection release mode or the like triggers the UE to change the access type (that is, reselects the network for the UE).
  • the RAT of the UE is changed from E-UTRAN to UTRAN/GERAN, so that the UE falls back to the traditional 2G/3G network; further, the UE that supports CSFB and has dropped back to the 2G/3G network sends a connection management service request message or a location area update request message to the network side MSC via the BSC/RNC; further, due to the UE
  • the RAT is changed, and the UE sends a PS NAS message, such as a RAU request message, to the SGSN, and the SGSN sends a context request message to the original network side MME of the UE to learn related information of the UE, where the context request message
  • the MME does not immediately reply the SGSN with the context information of the UE after receiving the context request message (the PS process is suspended because the SGSN does not obtain the context information of the UE)
  • the context information of the UE is sent to the SGSN after the timeout
  • the RAU timer and the duration of the timer for supervising the context request process in the SGSN may be designed according to the routing area update of the UE, and the second is satisfied if the RAU process and the SGSN context acquisition process are not timed out.
  • the preset duration of the timer should be long enough to ensure that the CSFB call of the UE has entered the ringing state or at least after the CS RAB establishment is completed; on the other hand, the UE sends a call setup message to the network side MSC, where the MSC is After receiving the call setup message, the BSC/RNC is required to allocate a suitable CS RAB to the UE, and the subsequent MSC and other network side devices process the session initiated by the calling UE, for example, sending a session request to the called party.
  • the UE the called UE triggers ringing when receiving the session request and sends a ring back tone to the calling UE, wherein when the calling UE hears the ring back tone, the entire CS session is successfully established; further, the SGSN obtains After the context information of the UE, the suspended PS process is continued.
  • FIG. 11 is a flowchart of a method for establishing a CSFB call according to an embodiment of the present invention.
  • a UE sends a NAS signaling (such as an extended service request message) to an MME on an LTE network side to trigger a CSFB process
  • the MME sends an S1-AP request message to the eNodeB, where the S1-AP request message includes indication information, where the indication information is used to notify the eNodeB that the UE has initiated a CSFB call; further, the eNodeB
  • the UE is configured to change the access type by using the NACC or the RRC connection release mode, that is, to reselect the network for the UE.
  • the RAT of the UE is changed from the E-UTRAN to the UTRAN/GERAN, so that the UE falls back.
  • the UE sends a connection management service request message to the network side MSC via the BSC/RNC; further, because the RAT of the UE changes, the UE sends a PS NAS message, such as an RAU request message, to the new PS core network device SGSN, the SGSN And sending a context request message to the original MME of the UE to obtain related information of the UE, where the context request message is used to learn context information of the UE, and the MME receives the context request.
  • a PS NAS message such as an RAU request message
  • the SGSN does not respond to the request, that is, the SGSN is not immediately replied to the SGSN (the PS process is suspended because the SGSN does not acquire the context information of the UE), and continues to wait for the notification of the MSC, when the MSC senses After the CSFB call has entered the ringing state or at least the CS RAB has been established, the MSC sends a notification message to the MME, where the notification message is used to inform the MME of the status of the circuit domain call, and the MME stops waiting after receiving the notification message.
  • the side MSC sends a call setup message, and the MSC requests the BSC/RNC to allocate a suitable CS RAB to the UE after receiving the call setup message, and the subsequent MSC and other network side devices will initiate a session to the calling UE.
  • Processing such as sending a session request to the called UE, the called UE triggers ringing when receiving the session request and sends a ring back tone to the calling UE, wherein when the calling UE hears the ring back tone, the entire CS The session is successfully established.
  • the SGSN continues to execute the suspended PS process.
  • FIG. 12 is a flowchart of a method for establishing a CSFB call according to an embodiment of the present invention.
  • a NAS signaling such as an extended service request message
  • the MME sends an S1-AP request message to the eNodeB, where the S1-AP request message includes indication information, where the indication information is used to notify the eNodeB that the UE has initiated a CSFB call; further, the eNodeB
  • the UE is configured to change the access type by using the NACC or the RRC connection release mode, that is, to reselect the network for the UE.
  • the RAT of the UE is changed from the E-UTRAN to the UTRAN/GERAN, so that the UE falls back.
  • the UE that supports CSFB and has dropped back to the 2G/3G network transmits a connection management service request message to the network side MSC via the BSC/RNC; further, since the RAT of the UE changes, the UE Sending a PS NAS message to the new PS core network device SGSN, such as a RAU request message, when the SGSN receives the first PS NAS message sent by the UE, the SGSN normally performs an uplink PS operation, where the uplink PS Operation as SGSN
  • the interaction with the core network node such as acquiring the context information of the UE from the original network side MME, taking the user subscription data/authentication data to the HSS, updating the location information in the HSS, and establishing/updating the GTP bearer information, etc.
  • the SGSN determines that the UE is performing a CSFB call by parsing the context information of the UE that is obtained from the MME, the SGSN starts a third timer, and performs a downlink PS operation after the timeout, where the downlink PS operation is
  • the interaction between the SGSN and the UE and/or the base station such as sending a RAU request accept message to the UE and sending a message requesting the PS RAB to the base station, delays the establishment of the PS RAB, and ensures that the CS RAB precedes the PS RAB. If the RAU process does not expire, the third timer is configured.
  • the preset duration of the third timer needs to be updated according to the routing area update RAU timer of the UE.
  • the preset duration should be long enough to ensure that the CSFB call of the UE has entered the ringing state or at least after the CS RAB establishment is completed; on the other hand, the UE sends a call setup message to the network side MSC.
  • the MSC requests the BSC/RNC to allocate a suitable CS RAB to the UE, and the subsequent MSC and other network side devices process the session initiated by the calling UE, such as a session request.
  • FIG. 13 is a schematic diagram of a base station according to an embodiment of the present invention.
  • the base station 130 provided in this embodiment includes: a receiving module 1301 and a delay module 1302.
  • the receiving module 1301 is configured to receive a packet switched non-access stratum PSNAS message sent by the user equipment, where the user equipment is a user equipment that is dropped back to the second generation 2G/third generation 3G network by the circuit switched fallback CSFB;
  • the delay module 1302 is configured to delay sending the PS NAS message to the general packet radio service technology service supporting node SGSN.
  • the base station further includes:
  • a determining module is configured to determine that the user equipment is in a CSFB call.
  • the determining module is specifically configured to:
  • the first circuit switched non-access stratum CS NAS message sent by the user equipment, that the user equipment is performing a CSFB call; wherein the first CS NAS message includes at least one of the following messages: a location area Update request message and connection management service request message; or,
  • the delay module 1302 is specifically configured to:
  • the receiving module After receiving the PS NAS message, the receiving module forwards the PS NAS message to the SGSN after a preset duration.
  • the preset duration is greater than or equal to a setup duration of the circuit switched radio access bearer CS RAB of the user equipment, or greater than or equal to a setup duration of the CSFB call.
  • the delay module 1302 is further configured to forward the PS NAS message to the SGSN only after receiving the circuit switched radio bearer CS RB setup complete message sent by the user equipment.
  • the delay module 1302 is further configured to forward the PSNAS message to the SGSN only after determining that the circuit switched radio access bearer CS RAB is established or the CSFB call has entered a ringing state. .
  • the delay module 1302 is further configured to: determine, by using the second CS NAS message, that the CS RAB establishment is complete or the CSFB call has entered a ringing state; wherein the second CS NAS message includes a vibration Ring message or session confirmation message.
  • the base station of this embodiment may be specifically configured with the technical solution of the method for establishing a CSFB call according to any one of the foregoing FIG. 1 and FIG. 7 to FIG. 9.
  • the implementation principle and technical effects are similar, and details are not described herein again.
  • FIG. 14 is a schematic diagram of a base station according to an embodiment of the present invention.
  • the base station 140 provided in this embodiment includes a processor 1401 and a memory 1402.
  • the base station 140 can also include a transmitter 1403 and a receiver 1404.
  • the transmitter 1403 and the receiver 1404 can be connected to the processor 1401.
  • the transmitter 1403 is configured to transmit data or information
  • the receiver 1404 is configured to receive data or information
  • the memory 1402 is configured to store execution instructions.
  • the processor 1401 communicates with the memory 1402, and the processor 1401 invokes The execution instruction in the memory 1402 is used to execute the method flow of the CSFB call establishment method described in any of FIG. 1 and FIG. 7 to FIG.
  • the base station of this embodiment may be used to perform the method flow of the CSFB call establishing method according to any one of the above-mentioned FIG. 1 and FIG. 7 to FIG.
  • FIG. 15 is a schematic diagram of an MME according to an embodiment of the present invention, as shown in FIG.
  • the MME 150 provided by the embodiment includes a receiving module 1501 and a delay module 1502.
  • the receiving module 1501 is configured to receive a context request message sent by the general packet radio service technology service supporting node SGSN, where the context request message is used to request to acquire context information of the user equipment; and the user equipment is a circuit switched back CSFB. User equipment that falls back to the second generation 2G/third generation 3G network;
  • the delay module 1502 is configured to delay sending the context information of the user equipment to the SGSN.
  • the MME further includes:
  • a determining module is configured to determine that the user equipment is in a CSFB call.
  • the delay module 1502 is specifically configured to:
  • the receiving module After receiving the context request message, the receiving module sends the context information of the user equipment to the SGSN after a preset duration.
  • the preset duration is greater than or equal to a setup duration of the circuit switched radio access bearer CS RAB of the user equipment, or greater than or equal to a setup duration of the CSFB call of the user equipment.
  • the delay module 1502 is specifically configured to send the context information of the user equipment to the device only after determining that the CSRAB establishment of the user equipment is completed or the CSFB call of the user equipment has entered a ringing state. Said SGSN.
  • the MME of this embodiment adopts the technical solution of the embodiment of the CSFB call establishment method described in FIG. 2, FIG. 10 or FIG. 11 , and the implementation principle and technical effects thereof are similar, and details are not described herein again.
  • the MME of the embodiment of the present invention is similar to the foregoing FIG. 14.
  • the MME provided in this embodiment includes a processor and a memory.
  • the MME may also include a transmitter and a receiver.
  • the transmitter and receiver can be connected to the processor.
  • the transmitter is configured to transmit data or information
  • the receiver is configured to receive data or information
  • the memory is used to store execution instructions, when the MME is running, the processor communicates with the memory, and the processor calls the execution instruction in the memory for execution.
  • the MME of this embodiment may be used to perform the method flow of the CSFB call setup method described in the foregoing FIG. 2, FIG. 10 or FIG.
  • FIG. 16 is a schematic diagram of an MSC according to an embodiment of the present invention.
  • the MSC 160 provided in this embodiment includes: an obtaining module 1601 and a sending module 1602.
  • the obtaining module 1601 is configured to acquire a circuit switched fallback CSFB call state.
  • the sending module 1602 is configured to: when the MSC determines that the CS RAB establishment is completed or the CSFB call The call has entered the ringing state, and sends a notification message to the mobility management entity MME, wherein the notification message is used to inform the MME CS of the call state.
  • the MSC of this embodiment may adopt the technical solution of the method for establishing a CSFB call according to the foregoing FIG. 3, and the implementation principle and technical effects thereof are similar, and details are not described herein again.
  • the MSC provided by the embodiment of the present invention is similar to the foregoing FIG. 14.
  • the MSC provided in this embodiment includes a processor and a memory.
  • the MSC can also include a transmitter and a receiver.
  • the transmitter and receiver can be connected to the processor.
  • the transmitter is used to transmit data or information
  • the receiver is used to receive data or information
  • the memory is used to store execution instructions
  • the processor communicates with the memory
  • the processor calls the execution instructions in the memory for execution.
  • the MSC of this embodiment may be used to perform the method flow of the CSFB call establishment method described in the foregoing FIG. 3 of the present invention.
  • FIG. 17 is a schematic diagram of an SGSN according to an embodiment of the present invention.
  • the SGSN 170 provided in this embodiment includes: a receiving module 1701, an uplink operating module 1702, and a delay module 1703.
  • the receiving module 1701 is configured to receive a packet switched non-access stratum PSNAS message initiated by the user equipment, where the user equipment is a user equipment that is dropped back to the second generation 2G/third generation 3G network by the circuit switched fallback CSFB;
  • the uplink operation module 1702 is configured to perform an uplink PS operation, where the uplink PS operation includes acquiring context information of the user equipment from a mobility management entity MME;
  • the delay module 1703 is configured to delay performing a downlink PS operation, where the downlink PS operation is an interaction operation between the SGSN and the user equipment or the base station.
  • the SGSN further includes:
  • a determining module is configured to determine that the user equipment is performing a circuit switched fallback CSFB call.
  • the determining module is specifically configured to: determine, according to the context information of the user equipment, that the user equipment is performing a CSFB call.
  • the delay module 1703 is specifically configured to:
  • the preset duration is greater than or equal to the circuit-switched radio access bearer of the user equipment.
  • the downlink PS operation includes: sending a routing area update RAU request accept message to the user equipment; or sending a request message to the base station, where the request message is used to request the base station to allocate the user equipment
  • the packet switched radio access carries the PS RAB.
  • the uplink PS operation further includes: acquiring subscription data/authentication data of the user equipment to the home user equipment server HSS; or updating location information in the HSS; or establishing/updating general packet radio service Technical tunneling protocol GTP bearer information.
  • the SGSN of this embodiment may adopt the technical solution of the foregoing embodiment of the method for establishing a CSFB call according to FIG. 4 or FIG. 12, and the implementation principle and technical effects thereof are similar, and details are not described herein again.
  • the SGSN provided by the embodiment of the present invention is similar to the foregoing FIG. 14.
  • the SGSN provided in this embodiment includes a processor and a memory.
  • the SGSN can also include a transmitter and a receiver.
  • the transmitter and receiver can be connected to the processor.
  • the transmitter is used to transmit data or information
  • the receiver is used to receive data or information
  • the memory is used to store execution instructions
  • the processor communicates with the memory
  • the processor calls the execution instruction in the memory for execution.
  • the SGSN of this embodiment can be used to perform the method flow of the CSFB call setup method described in the above FIG. 4 or FIG. 12 of the present invention.
  • FIG. 18 is a schematic diagram of still another MME according to an embodiment of the present invention.
  • the MME 180 provided in this embodiment includes: a receiving module 1801 and a delay module 1802.
  • the receiving module 1801 is configured to receive a context request message sent by the general packet radio service technology service supporting node SGSN, where the context request message is used to request to obtain context information of the user equipment.
  • the delay module 1802 is configured to delay sending the context information of the user equipment to the SGSN to delay the packet switched PS domain authentication process of the user equipment.
  • the delay module 1802 is specifically configured to:
  • the receiving module After receiving the context request message, the receiving module sends the context information of the user to the SGSN after a preset duration.
  • the preset duration is longer than a length of time required by the mobile switching center MSC to perform a circuit switched CS domain authentication procedure on the user equipment.
  • the preset duration is less than a duration of a corresponding PS service timer in the user equipment. Or less than the duration of the timer in the SGSN for supervising the context request procedure.
  • the context information includes at least one of the following: an international mobile subscriber identity IMSI information, an evolved packet system EPS bearer context information, and security key information.
  • the MME of this embodiment may adopt the technical solution of the embodiment of the authentication method in the wireless communication system of the present invention shown in FIG. 5, and the implementation principle and the technical effect are similar, and details are not described herein again.
  • the MME of the embodiment of the present invention is similar to the foregoing FIG. 14.
  • the MME provided in this embodiment includes a processor and a memory.
  • the MME may also include a transmitter and a receiver.
  • the transmitter and receiver can be connected to the processor.
  • the transmitter is configured to transmit data or information
  • the receiver is configured to receive data or information
  • the memory is used to store execution instructions, when the MME is running, the processor communicates with the memory, and the processor calls the execution instruction in the memory for execution.
  • the MME of this embodiment may be used to perform a method flow of an authentication method in the wireless communication system described above with reference to FIG. 5 of the present invention.
  • FIG. 19 is a schematic diagram of still another SGSN according to an embodiment of the present invention.
  • the SGSN 190 provided in this embodiment includes: a receiving module 1901, an uplink operating module 1902, and a delay module 1903.
  • the receiving module 1901 is configured to receive a packet switched non-access stratum PS NAS message initiated by the user equipment;
  • the uplink operation module 1903 is configured to perform an uplink PS operation, where the uplink PS operation includes acquiring context information of the user equipment to a mobility management entity MME;
  • the delay module 1903 is configured to delay sending a PS domain authentication request message to the user equipment to delay the PS domain authentication process of the user equipment.
  • the delay module 1903 is specifically configured to:
  • the receiving module After receiving the PS NAS message, the receiving module sends the PS domain authentication request message to the user equipment after a preset duration.
  • the preset duration is longer than a length of time required by the mobile switching center MSC to perform a circuit switched CS domain authentication procedure on the user equipment.
  • the preset duration is less than a duration of a corresponding PS service timer in the user equipment.
  • the SGSN further includes:
  • a determining module configured to determine whether the user equipment is a user equipment from a long term evolution LTE network, and when determining that the user equipment is a user equipment from a long term evolution LTE network, the delay module delays sending a PS to the user equipment
  • the domain authentication request message is used to delay the PS domain authentication process of the user equipment.
  • the determining module is specifically configured to: determine, according to the PS NAS message sent by the user equipment, whether the user equipment is a user equipment from an LTE network.
  • the uplink PS operation further includes: acquiring subscription data/authentication data of the user equipment to the home user equipment server HSS; or updating location information in the HSS.
  • the SGSN of this embodiment may adopt the technical solution of the embodiment of the authentication method in the wireless communication system of the foregoing FIG. 6 of the present invention, and the implementation principle and technical effects thereof are similar, and details are not described herein again.
  • the SGSN provided by the embodiment of the present invention is similar to the foregoing FIG. 14.
  • the SGSN provided in this embodiment includes a processor and a memory.
  • the SGSN can also include a transmitter and a receiver.
  • the transmitter and receiver can be connected to the processor.
  • the transmitter is used to transmit data or information
  • the receiver is used to receive data or information
  • the memory is used to store execution instructions
  • the processor communicates with the memory
  • the processor calls the execution instruction in the memory for execution.
  • the SGSN of this embodiment can be used to perform the method flow of the authentication method in the wireless communication system described above in FIG. 6 of the present invention.
  • the aforementioned program can be stored in a computer readable storage medium.
  • the program when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes various media that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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Abstract

本发明实施例提供一种CSFB呼叫建立方法及装置，该方法中基站通过接收用户设备发送的分组交换非接入层PS NAS消息；其中，所述用户设备为经电路交换回落CSFB回落至第二代2G/第三代3G网络的用户设备；进一步地，所述基站延迟向通用分组无线服务技术业务支撑节点SGSN发送所述PS NAS消息，从而延迟PS RAB的建立，保证PS业务流程不影响CS呼叫的建立，从而缩小呼叫建立时长，以提高语音呼叫效率。

Description

CSFB呼叫建立方法及装置 技术领域
本发明实施例涉及通信技术，尤其涉及一种CSFB呼叫建立方法及装置。
背景技术
目前全球移动通讯系统(Global System of Mobile communication，GSM)及宽带码分多址(Wideband Code Division Multiple Access，WCDMA)等第二代(Second Generation，2G)及第三代(Third Generation，3G)网络已经基本实现了全面覆盖。由于频谱资源的宝贵性和用户对高速数据业务的需求等，促使长期演进(Long Term Evolution，LTE)网络技术也得以快速的发展，LTE网络已覆盖到一些城区和话务热点地区，因此，目前的通信网络中LTE网络与2G或3G网络并存，其中，所述LTE网络又称为第四代(Fourth Generation，4G)网络。但由于LTE网络处于建设初期，LTE网络还不够完善，导致用户设备(User Equipment，UE)在语音呼叫建立过程中，因所在LTE网络不支持语音业务而无法建立语音会话。
电路交换回落(Circuit Switched Fallback，CSFB)可以解决上述因LTE网络不支持语音业务而导致无法建立语音会话的问题。其中，当支持CSFB的UE在LTE网络中触发语音业务且所述LTE网络不支持语音业务时，可通过CSFB流程先回退到具有电路交换(Circuit Switched，CS)域的目标2G/3G网络，并在所述目标2G/3G网络的CS域继续处理语音业务，从而完成CS语音呼叫的建立。其中，由于UE的无线接入类型(Radio Access Type，RAT)变化了，在目标网络侧的CS语音呼叫建立完成之前或CS语音呼叫建立的同时，UE会触发分组交换(Packet Switching，PS)域业务请求，如路由区更新(Routing Area Update，RAU)请求。
但现有的CSFB方案相比较于2G/3G网络的CS语音业务或LTE网络的语音业务，现有CSFB方案的语音呼叫建立的时延较长。
发明内容
本发明实施例提供一种CSFB呼叫建立方法及装置，用以提高语音呼叫效率。
第一方面，本发明实施例提供一种电路交换回落CSFB呼叫建立方法，包括：
基站接收用户设备发送的分组交换非接入层PS NAS消息；其中，所述用户设备为经电路交换回落CSFB回落至第二代2G/第三代3G网络的用户设备；
所述基站延迟向通用分组无线服务技术业务支撑节点SGSN发送所述PS NAS消息。
结合第一方面，在第一方面的第一种可能的实现方式中，所述基站延迟向通用分组无线服务技术业务支撑节点SGSN发送所述PS NAS消息，包括：
从所述基站接收到所述PS NAS消息开始，经过预设时长后，所述基站向所述SGSN转发所述PS NAS消息。
结合第一方面，在第一方面的第二种可能的实现方式中，所述基站延迟向通用分组无线服务技术业务支撑节点SGSN发送所述PS NAS消息，包括：
所述基站只有在接收到所述用户设备发送的电路交换无线承载CS RB建立完成消息之后，才将所述PS NAS消息转发给所述SGSN。
结合第一方面，在第一方面的第三种可能的实现方式中，所述基站延迟向通用分组无线服务技术业务支撑节点SGSN发送所述PS NAS消息，包括：
所述基站只有在确定电路交换无线接入承载CS RAB建立完成或所述CSFB呼叫已进入振铃状态之后，才将所述PS NAS消息转发给所述SGSN。
第二方面，本发明实施例提供一种电路交换回落CSFB呼叫建立方法，包括：
移动性管理实体MME接收通用分组无线服务技术业务支撑节点SGSN发送的上下文请求消息，所述上下文请求消息用于请求获取用户设备的上下文信息；所述用户设备为经电路交换回落CSFB回落至第二代2G/第三代3G网络的用户设备；
所述MME延迟向所述SGSN发送所述用户设备的上下文信息。
结合第二方面，在第二方面的第一种可能的实现方式中，所述MME延迟向所述SGSN发送所述用户设备的上下文信息，包括：
所述MME从接收到所述上下文请求消息开始，经过预设时长后，向所述SGSN发送所述用户设备的上下文信息。
结合第二方面，在第二方面的第二种可能的实现方式中，所述MME延迟向所述SGSN发送所述用户设备的上下文信息，包括：
所述MME只有在确定所述用户设备的CS RAB建立完成或所述用户设备的CSFB呼叫已进入振铃状态，才将所述用户设备的上下文信息发送给所述SGSN。
第三方面，本发明实施例提供一种电路交换回落CSFB呼叫建立方法，包括：
通用分组无线服务技术业务支撑节点SGSN接收由用户设备发起的分组交换非接入层PS NAS消息；其中，所述用户设备为经电路交换回落CSFB回落至第二代2G/第三代3G网络的用户设备；
所述SGSN执行上行PS操作，其中，所述上行PS操作包括向移动性管理实体MME获取所述用户设备的上下文信息；
所述SGSN延迟执行下行PS操作，所述下行PS操作为所述SGSN与所述用户设备或基站之间的交互操作。
结合第三方面，在第三方面的第一种可能的实现方式中，所述SGSN延迟执行下行PS操作，包括：
所述SGSN从接收到所述PS NAS消息开始或从确定所述用户设备正在进行CSFB呼叫开始，经过预设时长后，执行下行PS操作。
第四方面，本发明实施例提供一种无线通信系统中的鉴权方法，包括：
移动性管理实体MME接收通用分组无线服务技术业务支撑节点SGSN发送的上下文请求消息，所述上下文请求消息用于请求获取用户设备的上下文信息；
所述MME延迟向所述SGSN发送所述用户设备的上下文信息，以延迟所述用户设备的分组交换PS域鉴权过程。
结合第四方面，在第四方面的第一种可能的实现方式中，所述MME延迟向所述SGSN发送所述用户设备的上下文信息，包括：
所述MME从接收到所述上下文请求消息开始，经过预设时长后，向所述SGSN发送所述用户的上下文信息。
第五方面，本发明实施例提供一种无线通信系统中的鉴权方法，包括：
通用分组无线服务技术业务支撑节点SGSN接收由用户设备发起的分组交换非接入层PS NAS消息；
所述SGSN执行上行PS操作，其中，所述上行PS操作包括向移动性管理实体MME获取所述用户设备的上下文信息；
所述SGSN延迟向所述用户设备发送PS域鉴权请求消息，以延迟所述用户设备的PS域鉴权流程。
结合第五方面，在第五方面的第一种可能的实现方式中，所述SGSN延迟向所述用户设备发送PS域鉴权请求消息，包括：
所述SGSN从接收到所述PS NAS消息开始，经过预设时长后，向所述用户设备发送所述PS域鉴权请求消息。
结合第五方面，在第五方面的第二种可能的实现方式中，所述方法还包括：
所述SGSN判断所述用户设备是否为来自长期演进LTE网络的用户设备，当确定所述用户设备为来自长期演进LTE网络的用户设备时，延迟向所述用户设备发送PS域鉴权请求消息，以延迟所述用户设备的PS域鉴权流程。
第六方面，本发明实施例提供一种基站，包括：
接收模块，用于接收用户设备发送的分组交换非接入层PS NAS消息；其中，所述用户设备为经电路交换回落CSFB回落至第二代2G/第三代3G网络的用户设备；
延迟模块，用于延迟向通用分组无线服务技术业务支撑节点SGSN发送所述PS NAS消息。
结合第六方面，在第六方面的第一种可能的实现方式中，所述延迟模块具体用于：
从所述接收模块接收到所述PS NAS消息开始，经过预设时长后，向所述SGSN转发所述PS NAS消息。
结合第六方面，在第六方面的第二种可能的实现方式中，所述延迟模块具体用于：
只有在接收到所述用户设备发送的电路交换无线承载CS RB建立完成消息之后，才将所述PS NAS消息转发给所述SGSN。
结合第六方面，在第六方面的第三种可能的实现方式中，所述延迟模块具体用于：
只有在确定电路交换无线接入承载CS RAB建立完成或所述CSFB呼叫已进入振铃状态之后，才将所述PS NAS消息转发给所述SGSN。
第七方面，本发明实施例提供一种移动性管理实体MME，包括：
接收模块，用于接收通用分组无线服务技术业务支撑节点SGSN发送的上下文请求消息，所述上下文请求消息用于请求获取所述用户设备的上下文信息；所述用户设备为经电路交换回落CSFB回落至第二代2G/第三代3G网络的用户设备；
延迟模块，用于延迟向所述SGSN发送所述用户设备的上下文信息。
结合第七方面，在第七方面的第一种可能的实现方式中，所述延迟模块具体用于：
从所述接收模块接收到所述上下文请求消息开始，经过预设时长后，向所述SGSN发送所述用户设备的上下文信息。
结合第七方面，在第七方面的第二种可能的实现方式中，所述延迟模块具体用于：
只有在确定所述用户设备的CS RAB建立完成或所述用户设备的CSFB呼叫已进入振铃状态，才将所述用户设备的上下文信息发送给所述SGSN。
第八方面，本发明实施例提供一种通用分组无线服务技术业务支撑节点SGSN，包括：
接收模块，用于接收由用户设备发起的分组交换非接入层PS NAS消息；其中，所述用户设备为经电路交换回落CSFB回落至第二代2G/第三代3G网络的用户设备；
上行操作模块，用于执行上行PS操作，其中，所述上行PS操作包括向移动性管理实体MME获取所述用户设备的上下文信息；
延迟模块，用于延迟执行下行PS操作，所述下行PS操作为所述SGSN与所述用户设备或基站之间的交互操作。
结合第八方面，在第八方面的第一种可能的实现方式中，所述延迟模块具体用于：
从所述接收模块接收到所述PS NAS消息开始或从确定所述用户设备正 在进行CSFB呼叫开始，经过预设时长后，执行下行PS操作。
第九方面，本发明实施例提供一种移动性管理实体MME，包括：
接收模块，用于接收通用分组无线服务技术业务支撑节点SGSN发送的上下文请求消息，所述上下文请求消息用于请求获取用户设备的上下文信息；
延迟模块，用于延迟向所述SGSN发送所述用户设备的上下文信息，以延迟所述用户设备的分组交换PS域鉴权过程。
结合第九方面，在第九方面的第一种可能的实现方式中，所述延迟模块具体用于：
从所述接收模块接收到所述上下文请求消息开始，经过预设时长后，向所述SGSN发送所述用户的上下文信息。
第十方面，本发明实施例提供一种通用分组无线服务技术业务支撑节点SGSN，包括：
接收模块，用于接收由用户设备发起的分组交换非接入层PS NAS消息；
上行操作模块，用于执行上行PS操作，其中，所述上行PS操作包括向移动性管理实体MME获取所述用户设备的上下文信息；
延迟模块，用于延迟向所述用户设备发送PS域鉴权请求消息，以延迟所述用户设备的PS域鉴权流程。
结合第十方面，在第十方面的第一种可能的实现方式中，所述延迟模块具体用于：
从所述接收模块接收到所述PS NAS消息开始，经过预设时长后，向所述用户设备发送所述PS域鉴权请求消息。
结合第十方面，在第十方面的第二种可能的实现方式中，所述SGSN还包括：
判断模块，用于判断所述用户设备是否为来自长期演进LTE网络的用户设备，当确定所述用户设备为来自长期演进LTE网络的用户设备时，所述延迟模块延迟向所述用户设备发送PS域鉴权请求消息，以延迟所述用户设备的PS域鉴权流程。
本发明中，基站通过接收用户设备发送的分组交换非接入层PS NAS消息；其中，所述用户设备为经电路交换回落CSFB回落至第二代2G/第三代3G网络的用户设备；进一步地，所述基站延迟向通用分组无线服务技术业务 支撑节点SGSN发送所述PS NAS消息，从而延迟PS RAB的建立，保证PS业务流程不影响CS呼叫的建立，从而缩小呼叫建立时长，以提高语音呼叫效率。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为本发明实施例提供的一种CSFB呼叫建立方法流程图；
图2为本发明实施例提供的一种CSFB呼叫建立方法流程图；
图3为本发明实施例提供的一种CSFB呼叫建立方法流程图；
图4为本发明实施例提供的一种CSFB呼叫建立方法流程图；
图5为本发明实施例提供的一种无线通信系统中的鉴权方法流程图；
图6为本发明实施例提供的一种无线通信系统中的鉴权方法流程图；
图7为本发明实施例提供的一种CSFB呼叫建立方法流程图；
图8为本发明实施例提供的一种CSFB呼叫建立方法流程图；
图9为本发明实施例提供的一种CSFB呼叫建立方法流程图；
图10为本发明实施例提供的一种CSFB呼叫建立方法流程图；
图11为本发明实施例提供的一种CSFB呼叫建立方法流程图；
图12为本发明实施例提供的一种CSFB呼叫建立方法流程图；
图13为本发明实施例提供的一种基站的示意图；
图14为本发明实施例提供的一种基站的示意图；
图15为本发明实施例提供的一种MME的示意图；
图16为本发明实施例提供的一种MSC的示意图；
图17为本发明实施例提供的一种SGSN的示意图；
图18为本发明实施例提供的又一种MME的示意图；
图19为本发明实施例提供的又一种SGSN的示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
现有的2G/3G的核心网通常由PS域和CS域组成，其中，语音和其他CS补充业务由CS域支撑；LTE核心网不包括CS域，只有PS域，因此，被称为演进分组系统(Evolved Packet System，EPS)。其中，LTE网络为了提供语音业务必须包括IP多媒体子系统(IP multimedia subsystem，IMS)，IMS为会话控制层，因此，LTE/EPS系统中语音业务称为IMS基于IP的语音(voice over IP，VoIP)业务或基于LTE的语音(VoLTE)业务。
但由于LTE网络处于建设初期，LTE网络和IMS系统部署还不够完善，也即支持IMS VoIP业务的LTE网络并不多，导致UE在语音呼叫建立过程中，可能会因所在LTE网络并不支持IMS VoIP业务而无法建立语音会话。
图1为本发明实施例提供的一种CSFB呼叫建立方法流程图，如图1所示，本实施例的方法可以包括：
S101、基站接收用户设备发送的分组交换非接入层PS NAS消息。
本发明实施例中，经电路域交换回落CSFB回落至第二代2G/第三代3G网络的用户设备会向网络侧移动交换中心(Mobile Switching Center，MSC)发送呼叫建立(SET UP)消息，所述MSC收到所述呼叫建立消息后要求基站为所述用户设备分配合理的电路交换无线接入承载(CS Radio Access Bearer，CS RAB)；另一方面，由于所述用户设备的RAT变化了，所述用户设备可能会触发PS域业务请求，如RAU请求等。本发明实施例中，在基站为用户设备分配CS RAB之前或者在所述基站为所述用户设备分配CS RAB的同时，所述基站可能会接收到由用户设备发送给分组核心网设备的分组交换非接入层(PS Non-Access Stratum，PS NAS)消息；可选地，所述分组核心网设备可以为通用分组无线服务技术(GPRS)业务支撑节点(Serving GPRS Support Node，SGSN)，所述基站可以为基站控制器(Base Station Controller，BSC)/无线网络控制器(Radio Network Controller，RNC)，所述用户设备可以为UE/移动台(Mobile station，MS)。
S102、所述基站延迟向通用分组无线服务技术业务支撑节点SGSN发送所述PS NAS消息。
本发明实施中，为了使PS业务流程不影响CS呼叫的建立，所述基站通过延迟向GPRS业务支撑节点SGSN发送所述PS NAS消息，从而延迟PS RAB的建立，保证CS RAB先于PS RAB建立成功。可选地，所述基站可以从接收到所述PS NAS消息开始，经过预设时长后，向所述SGSN转发所述PS NAS消息，如可以通过触发定时器，直至所述定时器达到预设时长后向所述SGSN发送所述PS NAS消息。
可选地，步骤S102之前，所述方法还包括：
所述基站确定所述用户设备正在进行CSFB呼叫，可以采用如下任一种可实现方式：
第一种可实现方式为：所述基站根据所述用户设备发送的第一CS NAS消息，确定所述用户设备正在进行CSFB呼叫，如通过解析所述第一CS NAS消息，确定所述用户设备正在进行CSFB呼叫，其中，所述第一CS NAS消息包括但不限于：位置区更新请求消息和/或接续管理业务请求消息，所述位置区更新请求消息为所述用户设备回落至2G/3G网络后通过所述基站向移动交换中心MSC发送的消息，所述接续管理业务请求消息为所述用户设备回落至2G/3G网络后且在主叫场景下通过所述基站向移动交换中心MSC发送的消息；第二种可实现方式为：所述基站根据所述用户设备发送的寻呼响应消息，确定所述用户设备正在进行CSFB呼叫，可选地，通过解析所述寻呼响应消息，确定所述用户设备正在进行CSFB呼叫，其中，所述寻呼响应消息为所述用户设备回落至2G/3G网络后且在被叫场景下发送的消息；第三种可实现方式为：所述基站根据所述用户设备发送的无线资源控制(Radio Resource Control，RRC)连接建立请求消息确定所述用户设备正在进行CSFB呼叫，其中，所述RRC连接建立请求消息为所述用户设备回落至2G/3G网络后向所述基站发送的消息，所述RRC连接建立请求消息用于请求建立RRC连接，可选地，所述RRC连接建立请求消息中包含CSFB指示信息。
本发明实施例中，基站通过接收用户设备发送的PS NAS消息；其中，所述用户设备为经电路交换回落CSFB回落至第二代2G/第三代3G网络的用户设备；进一步地，所述基站延迟向SGSN发送所述PS NAS消息，从而延 迟PS RAB的建立，保证PS业务流程不影响CS呼叫的建立，从而缩小呼叫建立时长，以提高语音呼叫效率。
可选地，所述基站为所述用户设备分配CS RAB之前，还包括：
所述基站接收所述MSC发送的CS RAB分配请求，所述CS RAB分配请求用于指示所述基站在所述用户设备与所述MSC之间建立无线接入承载；其中，所述CS RAB分配请求为所述MSC在接收到所述用户设备发送的呼叫建立消息之后发送的请求。
本发明实施例中，所述基站在接收到由所述MSC发送的CS RAB分配请求后为所述用户设备分配CS RAB，其中，所述CS RAB分配请求用于指示所述基站在所述用户设备与所述MSC之间建立无线接入承载；其中，所述CS RAB分配请求为所述MSC在接收到所述用户设备发送的呼叫建立消息之后发送的请求。
在本发明实施例中所述基站延迟向通用分组无线服务技术业务支撑节点SGSN发送所述PS NAS消息，可以采用如下任一种可实现方式：
第一种可实现方式：从所述基站接收到所述PS NAS消息开始，经过预设时长后，所述基站向所述SGSN转发所述PS NAS消息
第二种可实现方式：所述基站只有在接收到所述用户设备发送的电路交换无线承载CS RB建立完成消息之后，才将所述PS NAS消息转发给所述SGSN；
第三种可实现方式：所述基站只有在确定电路交换无线接入承载CS RAB建立完成或所述CSFB呼叫已进入振铃状态之后，才将所述PS NAS消息转发给所述SGSN。
本发明实施例的第一种可实现方式中，为了使PS业务流程不影响CS呼叫的建立，所述基站从接收到所述PS NAS消息开始，经过预设时长后，才向所述SGSN转发所述PS NAS消息，可选地，所述预设时长大于等于所述用户设备的电路交换无线接入承载CS RAB的建立时长，或者大于等于所述CSFB呼叫的建立时长，从而延迟PS RAB的建立，保证CS RAB先于PS RAB建立成功。可选地，所述基站可以通过开启第一定时器，待所述第一定时器达到所述第一定时器的预设时长后，所述基站向所述SGSN转发所述PS NAS消息，其中，所述第一定时器的预设时长大于等于所述用户设备的电路交换 无线接入承载CS RAB的建立时长，或者大于等于所述CSFB呼叫的建立时长。可选地，所述第一定时器的预设时长还可根据所述用户设备的路由区更新RAU定时器时长进行设计，在满足RAU过程未超时的前提下，所述第一定时器的预设时长应足够长，保证在所述用户设备的CSFB呼叫已进入振铃状态或者至少CS RAB建立完成后超时，可选地，所述第一定时器的预设时长小于所述用户设备的路由区更新RAU定时器时长。
本发明实施例的第二种可实现方式中，为了使PS业务流程不影响CS呼叫的建立，所述基站暂不向所述SGSN转发所述PS NAS消息，直到所述基站接收到所述用户设备发送的电路交换无线承载(Circuit Switching Radio Bearer，CS RB)建立完成消息之后，所述基站才将所述PS NAS消息转发给所述SGSN，从而延迟PS RAB的建立，保证CS RAB先于PS RAB建立成功。其中，所述CS RB建立完成消息为所述用户设备在收到所述基站发送的CSRB建立请求消息之后向所述基站发送的消息，其中，所述CS RB建立请求消息中包含所述基站为所述用户设备分配的相关CS域无线空口资源。
本发明实施例的第三种可实现方式中，为了使PS业务流程不影响CS呼叫的建立，所述基站暂不向所述SGSN转发所述PS NAS消息，直到所述基站确定电路交换无线接入承载CS RAB建立完成或所述CSFB呼叫已进入振铃状态之后，所述基站才将所述PS NAS消息转发给所述SGSN，从而延迟PS RAB的建立，保证CS RAB先于PS RAB建立成功。可选地，所述基站通过第二CS NAS消息，确定所述CS RAB建立完成或所述CSFB呼叫已进入振铃状态，可选地，所述第二CS NAS消息包括但不限于：振铃消息或会话确认消息。
图2为本发明实施例提供的一种CSFB呼叫建立方法流程图，如图2所示，本实施例的方法可以包括：
S201、移动性管理实体MME接收通用分组无线服务技术业务支撑节点SGSN发送的上下文请求消息。
本发明实施例中，经电路域交换回落CSFB回落至第二代2G/第三代3G网络的用户设备会向网络侧MSC发送SET UP消息，所述MSC收到所述SET UP消息后要求基站为所述用户设备分配合理的CS RAB；另一方面，所述用户设备在接入新的目标网络后，随时可能会向PS核心网设备SGSN发起PS 业务流程(如RAU等)，进一步地，所述SGSN会向所述用户设备的原网络侧的移动性管理实体(Mobility Management Entity，MME)请求获取所述用户设备的上下文，以获知所述用户设备的相关信息。本发明实施例中，在基站为用户设备分配CS RAB之前或者在所述基站为所述用户设备分配CS RAB的同时，移动性管理实体MME可能会接收到GPRS业务支撑节点SGSN发送的上下文请求消息，其中，所述上下文请求消息用于请求获取所述用户设备的上下文信息，可选地，所述用户设备的上下文信息包括如下信息中至少一种：所述用户的国际移动用户识别码(International Mobile Subscriber Identification Number，IMSI)信息、演进分组系统(Evolved Packet System，EPS)承载上下文信息及安全密钥信息。
S202、所述MME延迟向所述SGSN发送所述用户设备的上下文信息。
本发明实施例中，当SGSN获取不到所述用户设备的上下文信息，则PS业务流程会暂停，为了使PS业务流程不影响CS呼叫的建立，所述MME通过延迟向所述SGSN发送所述用户设备的上下文信息的方式延迟了所述用户设备所发起的PS业务流程，也即延迟PS RAB的建立，保证CS RAB先于PS RAB建立成功。可选地，所述MME可以从接收到所述上下文请求消息开始，经过预设时长后，向所述SGSN发送所述用户设备的上下文信息，如可以通过触发定时器，直至所述定时器达到预设时长后向所述SGSN发送所述用户设备的上下文信息。
可选地，步骤S202之前，还包括：所述MME确定所述用户设备正在进行CSFB呼叫。
本发明实施例中，可选地，所述MME判断所述上下文请求消息所对应的用户设备是否正在进行CSFB呼叫的方式如下：所述MME可以通过在接收所述用户设备发起的扩展业务请求时，记录所述用户设备发起了CSFB呼叫以及所述用户设备的用户标识，当接收到SGSN发送的上下文请求消息时，所述MME根据所述上下文请求消息中包含的用户标识，查询所述MME中已记录的发起CSFB呼叫的用户标识信息以判断所述上下文请求消息所对应的用户设备是否正在进行CSFB呼叫，若所述上下文请求消息中包含的用户标识属于所述MME中已记录的发起CSFB呼叫的用户标识信息，则所述MME确定所述用户设备正在进行电路交换回落CSFB呼叫。
本发明实施例中，MME接收SGSN发送的上下文请求消息，其中，所述上下文请求消息用于请求获取所述用户设备的上下文信息，所述用户设备为经电路交换回落CSFB回落至第二代2G/第三代3G网络的用户设备；进一步地，所述MME延迟向所述SGSN发送所述用户设备的上下文信息，从而延迟PS RAB的建立，保证PS业务流程不影响CS呼叫的建立，从而缩小呼叫建立时长，以提高语音呼叫效率。
可选地，所述移动性管理实体MME接收通用分组无线服务技术业务支撑节点SGSN发送的上下文请求消息之前，还包括：
所述MME接收由所述用户设备发送的非接入层NAS信令，所述NAS信令用于触发CSFB呼叫；
所述MME向演进型网络基站eNodeB发送通知消息，所述通知消息用于通知所述eNodeB所述用户设备已发起CSFB呼叫。
本发明实施例中，所述MME接收由所述用户设备发送的NAS信令(如扩展业务请求)以触发CSFB呼叫，进一步地，所述MME向演进型网络基站(E-UTRAN NodeB，eNodeB)发送通知消息，可选地，所述通知消息可以为S1口应用协议(S1-Application Protocol，S1-AP)请求消息，其中，所述S1-AP请求消息中包含用于告知所述eNodeB所述用户设备已发起CSFB呼叫的指示信息。
本发明实施例中，所述MME延迟向所述SGSN发送所述用户设备的上下文信息，可以采用如下任一种可实现方式：
第一种可实现方式：所述MME从接收到所述上下文请求消息开始，经过预设时长后，向所述SGSN发送所述用户设备的上下文信息
第二种可实现方式：所述MME只有在确定用户设备的CS RAB建立完成或所述用户设备的CSFB呼叫已进入振铃状态，才将所述用户设备的上下文信息发送给所述SGSN。
本发明实施例的第一种可实现方式中，为了使PS业务流程不影响CS呼叫的建立，所述MME从接收到所述上下文请求消息开始，经过预设时长后，向所述SGSN发送所述用户设备的上下文信息，可选地，所述预设时长大于等于所述用户设备的电路交换无线接入承载CS RAB的建立时长，或者大于等于所述用户设备的CSFB呼叫的建立时长，从而延迟PS RAB的建立，保 证CS RAB先于PS RAB建立成功。可选地，所述MME可以通过开启第二定时器，待所述第二定时器达到所述第二定时器的预设时长后，所述MME向所述SGSN发送所述用户设备的上下文信息，其中，所述第二定时器的预设时长大于等于所述用户设备的电路交换无线接入承载CS RAB的建立时长，或者大于等于所述用户设备的CSFB呼叫的建立时长。可选地，所述第二定时器的预设时长还可根据所述用户设备的路由区更新RAU定时器和所述SGSN中用于监督上下文请求流程的定时器的时长进行设计，在满足RAU过程和SGSN上下文获取过程未超时的前提下，所述第二定时器的预设时长应足够长，保证在所述用户设备的CSFB呼叫已进入振铃状态或者至少CS RAB建立完成后超时。可选地，所述预设时长小于所述用户设备的路由区更新RAU定时器时长和所述SGSN中的所述定时器时长。
本发明实施例的第二种可实现方式中，为了使PS业务流程不影响CS呼叫的建立，所述MME暂不向所述SGSN发送所述用户设备的上下文信息，直到所述MME确定所述用户设备的CS RAB建立完成或所述用户设备的CSFB呼叫已进入振铃状态之后，所述MME才将所述用户设备的上下文信息发送给所述SGSN，从而延迟PS RAB的建立，保证CS RAB先于PS RAB建立成功。可选地，所述MME可根据移动交换中心MSC发送的通知消息来确定所述用户设备的CS RAB建立完成或所述用户设备的CSFB呼叫已进入振铃状态，其中，所述通知消息为所述MSC在确定CS RAB建立完成或所述CSFB呼叫已进入振铃状态后发送的消息，所述通知消息用于告知所述MME CSFB呼叫状态，从而所述MME获知CSFB呼叫的状态。本发明实施例中，在整个CSFB呼叫建立和通话的过程中，服务的所述MSC能感知CSFB呼叫的状态，如所述CS RAB是否建立成功、CSFB呼叫是否进入振铃状态或CSFB呼叫是否进入通话状态等；当所述MSC感知到CSFB呼叫已进入振铃状态或至少CS RAB已建立完成，则所述MSC通过SGs/Sv接口向所述MME发送通知消息，所述通知消息用于告知MME所述电路域呼叫的状态。
图3为本发明实施例提供的一种CSFB呼叫建立方法流程图，如图3所示，本实施例的方法可以包括：
S301、移动交换中心MSC获取电路交换回落CSFB呼叫状态。
本发明实施例中，在整个CSFB呼叫建立和通话的过程中，服务的MSC 是能获取CSFB呼叫状态，如CS RAB是否建立成功，CSFB呼叫是否进入振铃状态或CSFB呼叫是否进入通话状态等，可选地，MSC获取CSFB呼叫状态的方式为：通过解析呼叫过程的CS NAS信息获取CSFB呼叫状态，如振铃消息或会话确认消息等
S302、当所述MSC确定CS RAB建立完成或所述CSFB呼叫已进入振铃状态，所述MSC向移动性管理实体MME发送通知消息。
本发明实施例中，所述MSC一旦确定CS RAB建立完成或所述CSFB呼叫已进入振铃状态，则向MME发送用于告知MME所述CSFB呼叫状态的通知消息，可选地，所述MSC通过SGs/Sv接口向所述MME发送所述通知消息，以便于当所述MME获知所述CSFB呼叫已进入振铃状态或者CS RAB已建立完成后，停止等待，并将所述用户设备的上下文信息发送给所述SGSN，从而延迟PS RAB的建立，保证CS RAB先于PS RAB建立成功。
本发明实施例中，移动交换中心MSC获取电路交换回落CSFB呼叫状态；进一步地，当所述MSC确定CS RAB建立完成或所述CSFB呼叫已进入振铃状态，所述MSC向移动性管理实体MME发送通知消息，其中，所述通知消息用于告知所述MME CS呼叫状态，以便于当所述MME获知所述CSFB呼叫已进入振铃状态或者CS RAB已建立完成后，停止等待，并将所述用户设备的上下文信息发送给所述SGSN，从而延迟PS RAB的建立，保证CS RAB先于PS RAB建立成功。
图4为本发明实施例提供的一种CSFB呼叫建立方法流程图，如图3所示，本实施例的方法可以包括：
S401、通用分组无线服务技术业务支撑节点SGSN接收由用户设备发起的分组交换非接入层PS NAS消息。
本发明实施例中，经电路域交换回落CSFB回落至第二代2G/第三代3G网络的用户设备会向网络侧MSC发送SET UP消息，所述MSC收到所述SET UP消息后要求基站为所述用户设备分配合理的CS RAB；另一方面，所述用户设备在接入新的目标网络后，随时可能会向PS核心网设备SGSN发起PS业务流程(如RAU等)。本发明实施例中，在基站为用户设备分配CS RAB之前或者在所述基站为所述用户设备分配CS RAB的同时，通用分组无线服务技术业务支撑节点SGSN可能会接收到由用户设备发起的分组交换非接入 层PS NAS消息。
S402、所述SGSN执行上行PS操作，其中，所述上行PS操作包括向移动性管理实体MME获取所述用户设备的上下文信息。
本发明实施例中，可选地，当所述SGSN接收到由所述用户设备发送的第一个PS NAS消息时，所述SGSN正常执行上行PS操作，其中，所述上行PS操作为SGSN与核心网节点之间的交互操作，可选地，所述核心网节点包括但不限于：MME、归属用户设备服务器(Home Subscriber Server，HSS)以及通用分组交换卫星网络(Generalized Packet Satellite Network，GPSN)；所述上行PS操作包括向移动性管理实体MME获取所述用户设备的上下文信息；可选地，所述上行PS操作还包括：向归属用户服务器HSS获取所述用户设备的签约数据/鉴权数据、或者更新所述HSS中的位置信息、或者建立/更新通用分组无线服务技术隧道协议GTP承载信息。
S403、所述SGSN延迟执行下行PS操作，所述下行PS操作为所述SGSN与所述用户设备或基站之间的交互操作。
本发明实施中，为了使PS业务流程不影响CS呼叫的建立，所述SGSN通过延迟执行所述PS业务的下行PS操作，其中，所述下行PS操作为所述SGSN与所述用户设备或基站之间的交互操作，从而延迟PS RAB的建立，保证CS RAB先于PS RAB建立成功。
可选地，所述下行PS操作包括：向所述用户设备发送路由区更新RAU请求接受消息，或者向所述基站发送请求消息，所述请求消息用于请求所述基站为所述用户设备分配分组交换无线接入承载PS RAB。
可选地，所述SGSN可以从接收到所述PS NAS消息开始或从确定所述用户设备正在进行CSFB呼叫开始，经过预设时长后，执行下行PS操作，如可以通过触发定时器，直至所述定时器达到预设时长后执行下行PS操作的方式以保证PS业务流程不影响CS呼叫的建立。可选地，所述预设时长大于等于所述用户设备的电路交换无线接入承载CS RAB的建立时长，或者大于等于所述CSFB呼叫的建立时长。可选地，所述SGSN可以通过开启第三定时器，待所述第三定时器达到所述第三定时器的预设时长后执行下行PS操作，可选地，所述第三定时器的预设时长大于等于所述用户设备的电路交换无线接入承载CS RAB的建立时长，或者大于等于所述CSFB呼叫的建立时长。 可选地，所述第三定时器的预设时长还可根据所述用户设备的路由区更新RAU定时器时长进行设计，在满足RAU过程未超时的前提下，所述第三定时器的预设时长应足够长，保证在所述用户设备的CSFB呼叫已进入振铃状态或者至少CS RAB建立完成后超时，可选地，所述预设时长小于所述用户设备的路由区更新RAU定时器时长。
可选地，步骤S403之前，还包括：所述SGSN确定所述用户设备正在进行电路交换回落CSFB呼叫。
本发明实施例中，可选地，所述SGSN可以根据所述用户设备的上下文信息确定所述用户设备正在进行CSFB呼叫。
本发明实施例中，SGSN接收由用户设备发起的PS NAS消息；其中，所述用户设备为经电路交换回落CSFB回落至2G/3G网络的用户设备；进一步地，所述SGSN执行上行PS操作，所述上行PS操作包括向移动性管理实体MME获取所述用户设备的上下文信息；所述SGSN延迟执行下行PS操作，从而延迟PS RAB的建立，保证PS业务流程不影响CS呼叫的建立，从而缩小呼叫建立时长，以提高语音呼叫效率。
图5为本发明实施例提供的一种无线通信系统中的鉴权方法流程图，如图5所示，本实施例的方法可以包括：
S501、移动性管理实体MME接收通用分组无线服务技术业务支撑节点SGSN发送的上下文请求消息。
当用户改变RAT，从LTE网络接入到3G/2G网络后(例如，当UE需要进行语音通话时，可能因LTE网络不支持语音业务而需经CSFB回落到2G/3G网络以发起CS语音业务；或者当LTE网络发生异常，如LTE信号减弱，UE经切换或者网络重选方式而接入2G/3G网络)，可随时经基站向核心网节点SGSN发起PS域流程，如PS附着流程和/或RAU流程等；进一步地，所述SGSN收到所述UE经所述基站发送的PS NAS消息后，如附着请求消息和/或RAU请求消息等，则向原MME发起用于请求获取所述用户设备上下文信息的上下文请求消息(也即表明所述用户设备从LTE网络接入了2G/3G网络)，可选地，所述用户设备的上下文信息包括如下信息中至少一种：IMSI信息、EPS承载上下文信息及安全密钥信息。
S502、所述MME延迟向所述SGSN发送所述用户设备的上下文信息， 以延迟所述用户设备的分组交换PS域鉴权过程。
当用户设备从LTE网络切换到3G/2G网络时，3G/2G网络的SGSN和MSC会分别对所述用户设备发起鉴权流程以识别所述用户设备的身份和协商安全密钥，其中，由于运营商配置因素(如L值设置过小)，CS域和PS域的鉴权流程可能并不同步，可能导致CS域鉴权过程中的同步检测(SQN检测)过程失败。可选地，所述SGSN在收到所述用户设备的上下文信息后才会向所述用户设备发起鉴权流程。
所述MME延迟向所述SGSN发送所述用户设备的上下文信息，当所述SGSN获取不到所述用户设备的上下文信息，则会暂停PS业务流程，其中，所述PS业务流程包含PS域鉴权过程，以便CS域业务流程中包括的CS域鉴权流程可先执行。
在本发明实施例中，所述MME通过延迟向所述SGSN发送所述用户设备的上下文信息，导致所述SGSN延迟向所述用户设备发起PS域鉴权请求消息，从而延迟所述用户设备的PS域鉴权流程，也即所述用户设备从LTE切换到3G/2G后先完成CS域的鉴权流程，从而保证CS域业务不受影响。
可选地，MME延迟向SGSN发送所述用户设备上下文信息的方式可以为：所述MME从接收到所述上下文请求消息开始，经过预设时长后，向所述SGSN发送所述用户的上下文信息；可选地，所述预设时长根据移动交换中心MSC对所述用户设备的电路交换CS域鉴权流程所需时长进行配置，可选地，所述预设时长大于所述CS域鉴权流程所需时长；可选地，所述预设时长根据所述用户设备中对应的PS业务定时器的时长或所述SGSN中用于监督所述上下文请求流程的定时器的时长进行配置，可选地，所述预设时长小于所述用户设备中对应的PS业务定时器的时长或小于所述SGSN中用于监督所述上下文请求流程的定时器的时长；优选地，所述预设时长大于所述CS域鉴权流程所需时长，且小于所述用户设备中对应的PS业务定时器的时长或所述SGSN中用于监督所述上下文请求流程的定时器的时长。可选地，所述MME可以通过触发定时器，直到所述定时器超时后才向所述SGSN回复上下文响应消息，其中，所述上下文响应消息中携带所述用户设备的上下文信息。可选地，所述定时器时长可根据移动交换中心MSC对所述用户设备的电路交换CS域鉴权流程所需时长、所述用户设备中对应的PS业务定时器(如RAU 定时器)或SGSN中用于监督上下文请求流程的定时器的时长进行配置，在满足所述用户设备所发的PS业务过程和SGSN上下文获取过程未超时前提下，所述定时器时间可以足够长，以保证在UE发起的CS业务流程已完成或至少CS域鉴权流程已完成后，所述定时器才超时。
图6为本发明实施例提供的一种无线通信系统中的鉴权方法流程图，如图6所示，本实施例的方法可以包括：
S601、通用分组无线服务技术业务支撑节点SGSN接收由用户设备发起的分组交换非接入层PS NAS消息。
本发明实施例中，当用户设备改变RAT，从LTE网络接入到3G/2G网络后(例如，当UE需要进行语音通话时，可能因LTE网络不支持语音业务而需经CSFB回落到2G/3G网络以发起CS语音业务；或者当LTE网络发生异常，如LTE信号减弱，UE经切换或者网络重选方式而接入2G/3G网络)，可随时经基站向核心网节点SGSN发起PS NAS消息以触发PS域流程，如PS附着流程和/或RAU流程等，也即，所述SGSN可能会接收到由所述用户设备发起的分组交换非接入层PS NAS消息。
S602、所述SGSN执行上行PS操作，其中，所述上行PS操作包括向移动性管理实体MME获取所述用户设备的上下文信息。
当所述SGSN接收到由所述用户设备发送的PS NAS消息时，所述SGSN可以正常执行上行PS操作，其中，所述上行PS操作为所述SGSN与核心网节点之间的交互操作，所述上行PS操作包括向移动性管理实体MME获取所述用户设备的上下文信息；可选地，所述上行PS操作还包括：向HSS获取所述用户设备的签约数据/鉴权数据、或者更新所述HSS中的位置信息。
S603、所述SGSN延迟向所述用户设备发送PS域鉴权请求消息，以延迟所述用户设备的PS域鉴权流程。
本发明实施例中，通过所述SGSN延迟向所述用户设备发送PS域鉴权请求消息以延迟PS域鉴权流程的操作，可防止PS域鉴权流程干扰CS域鉴权流程，以保证CS域鉴权流程优先执行，从而避免用户设备因无法通过CS域鉴权而无法进行CS语音业务的问题。
可选地，所述SGSN延迟向所述用户设备发送PS域鉴权请求消息的方式可以为：所述SGSN可以从接收到所述PS NAS消息开始，经过预设时长后， 向所述用户设备发送所述PS域鉴权请求消息，可选地，所述预设时长根据移动交换中心MSC对所述用户设备的电路交换CS域鉴权流程所需时长进行配置，可选地，所述预设时长大于所述CS域鉴权流程所需时长；可选地，所述预设时长根据所述用户设备中对应的PS业务定时器的时长进行配置，可选地，所述预设时长小于所述用户设备中对应的PS业务定时器的时长；优选地，所述预设时长大于所述CS域鉴权流程所需时长，且小于所述用户设备中对应的PS业务定时器的时长。可选地，所述SGSN在接收到所述PS NAS消息后触发定时器，直至所述定时器超时后才向所述用户设备发起PS域鉴权请求消息，以触发对所述用户设备的PS鉴权流程，可选地，所述定时器时长可根据移动交换中心MSC对所述用户设备的电路交换CS域鉴权流程所需时长与所述用户设备中对应的PS业务定时器(如RAU流程定时器)时长进行配置，在满足所述用户设备所发的PS业务过程不超时前提下，所述定时器时间可以足够长，保证在所述用户设备发起的CS业务流程已完成或至少CS域鉴权流程已完成后，所述定时器才超时。
本发明实施例中，所述SGSN通过延迟向所述用户设备发送PS域鉴权请求消息，以延迟PS域鉴权流程，也即所述用户设备从LTE切换到3G/2G后先完成CS域的鉴权流程，从而保证CS域业务不受影响。
可选地，所述SGSN接收由用户设备发起的分组交换非接入层PS NAS消息之后，还包括：所述SGSN判断所述用户设备是否为来自长期演进LTE网络的用户设备，当确定所述用户设备为来自长期演进LTE网络的用户设备时，延迟向所述用户设备发送PS域鉴权请求消息，以延迟所述用户设备的PS域鉴权流程。
本发明实施例中，可选地，所述SGSN可以根据解析所述用户设备发送的所述PS NAS消息，判断所述用户设备是否为来自长期演进LTE网络的用户设备，可选地，所述用户设备发送的所述PS NAS消息可以是RAU请求消息或附着请求消息；进一步地，当确定所述用户设备为来自长期演进LTE网络的用户设备时，所述SGSN通过延迟向所述用户设备发送PS域鉴权请求消息，以延迟所述用户设备的PS域鉴权流程。
图7为本发明实施例提供的一种CSFB呼叫建立方法流程图，如图7所示，当UE向LTE网络侧的MME发送一个NAS信令(如扩展业务请求消息) 以触发CSFB流程后，所述MME向eNodeB发送S1-AP请求消息，其中，所述S1-AP请求消息中包含指示信息，所述指示信息用于告知所述eNodeB所述UE已发起CSFB呼叫；进一步地，所述eNodeB通过网络辅助小区重选(Network Assisted Cell Change，NACC)或者RRC连接释放等方式触发UE改变接入类型(也即为所述UE重新选网)，可选地，将所述UE的RAT从演进的陆地无线接入网(Evolved Universal Terrestrial Radio Access Network，E-UTRAN)改变为陆地无线接入网(Universal Terrestrial Radio Access Network，UTRAN)/全球移动通讯系统/增强型数据速率GSM演进技术无线接入网络(GSM/EDGE Radio Access Network，GERAN)，从而使得UE回落到传统2G/3G网络；进一步地，支持CSFB且已回落至2G/3G网络的所述UE会向BSC/RNC发送RRC连接建立请求消息，同时所述UE经BSC/RNC向网络侧MSC发送接续管理业务请求(CM service request)消息，可选地，基站子系统(Base Station Subsystem，BSS)/无线网络子系统(Radio Network Subsystem，RNS)的核心设备BSC/RNC可以通过RRC连接建立请求消息中包括的CSFB指示信息判断该RRC建立请求是否由CSFB引起的，或者BSC/RNC可通过解析所述接续管理业务请求消息或位置区更新请求消息判断UE发起的电路域呼叫是否由CSFB引起的，或者在被叫场景下BSC/RNC也可通过解析寻呼响应消息判断UE发起的电路域呼叫是否由CSFB引起的；进一步地，由于UE的RAT改变了，UE经BSC/RNC向SGSN发送PS NAS消息，当BSC/RNC接收到所述PS NAS消息且确定所述UE正在进行CSFB呼叫时，BSC/RNC通过开启第一定时器，超时后向SGSN转发所述PS NAS消息，从而延迟PS RAB的建立，保证CS RAB先于PS RAB建立成功，可选地，所述第一定时器的预设时长可根据所述UE的路由区更新RAU定时器时长进行设计，在满足RAU过程未超时的前提下，所述第一定时器的预设时长应足够长，保证在所述UE的CSFB呼叫已进入振铃状态或者至少CS RAB建立完成后超时；另一方面，UE向网络侧MSC发送呼叫建立消息，所述MSC在收到所述呼叫建立消息后要求BSC/RNC为所述UE分配合适的CSRAB，后续所述MSC及其他网络侧设备会对主叫UE发起的会话进行处理，如将会话请求发往被叫UE，被叫UE在收到会话请求时触发振铃并向主叫UE发送回铃音，其中，当主叫UE听到回铃音时，整个CS会话建立成功。
图8为本发明实施例提供的一种CSFB呼叫建立方法流程图，如图8所示，当UE向LTE网络侧的MME发送一个NAS信令(如扩展业务请求消息)以触发CSFB流程后，所述MME向eNodeB发送S1-AP请求消息，其中，所述S1-AP请求消息中包含指示信息，所述指示信息用于告知所述eNodeB所述UE已发起CSFB呼叫；进一步地，所述eNodeB通过NACC或者RRC连接释放等方式触发UE改变接入类型(也即为所述UE重新选网)，可选地，将所述UE的RAT从E-UTRAN改变为UTRAN/GERAN，从而使得UE回落到传统2G/3G网络；进一步地，支持CSFB且已回落至2G/3G网络的所述UE会向BSC/RNC发送RRC连接建立请求消息，同时所述UE经BSC/RNC向网络侧MSC发送接续管理业务请求消息，可选地，BSC/RNC可以通过RRC连接建立请求消息中包括的CSFB指示信息判断该RRC建立请求是否由CSFB引起的，或者BSC/RNC可通过解析所述接续管理业务请求消息或位置区更新请求消息判断UE发起的电路域呼叫是否由CSFB引起的，或者在被叫场景下BSC/RNC也可通过解析寻呼响应消息判断UE发起的电路域呼叫是否由CSFB引起的；进一步地，由于UE的RAT改变了，UE经BSC/RNC向SGSN发送PS NAS消息，当BSC/RNC接收到所述PS NAS消息且确定所述UE正在进行CSFB呼叫时，BSC/RNC暂不向所述SGSN转发所述PS NAS消息，直至所述基站接收到所述UE发送的CS RB建立完成消息之后将所述PS NAS消息转发给所述SGSN，从而延迟PS RAB的建立，保证CS RAB先于PS RAB建立成功；另一方面，UE向网络侧MSC发送呼叫建立消息，所述MSC在收到所述呼叫建立消息后向BSC/RNC发送CS RAB分配请求消息，以要求BSC/RNC为所述UE分配合适的CS RAB，BSC/RNC向UE发送CS RB建立请求消息，其中，所述CS RB建立请求消息中包含所述基站为所述UE分配的相关CS域无线空口资源，所述UE在收到所述CS RB建立请求消息之后向所述BSC/RNC发送CS RB建立完成消息，BSC/RNC认为CS RAB建立完成并向MSC回复分配响应消息；进一步地，后续所述MSC及其他网络侧设备会对主叫UE发起的会话进行处理，如将会话请求发往被叫UE，被叫UE在收到会话请求时触发振铃并向主叫UE发送回铃音，其中，当主叫UE听到回铃音时，整个CS会话建立成功。
图9为本发明实施例提供的一种CSFB呼叫建立方法流程图，如图9所 示，当UE向LTE网络侧的MME发送一个NAS信令(如扩展业务请求消息)以触发CSFB流程后，所述MME向eNodeB发送S1-AP请求消息，其中，所述S1-AP请求消息中包含指示信息，所述指示信息用于告知所述eNodeB所述UE已发起CSFB呼叫；进一步地，所述eNodeB通过NACC或者RRC连接释放等方式触发UE改变接入类型(也即为所述UE重新选网)，可选地，将所述UE的RAT从E-UTRAN改变为UTRAN/GERAN，从而使得UE回落到传统2G/3G网络；进一步地，支持CSFB且已回落至2G/3G网络的所述UE会向BSC/RNC发送RRC连接建立请求消息，同时所述UE经BSC/RNC向网络侧MSC发送接续管理业务请求或位置区更新请求消息等，可选地，BSC/RNC可以通过RRC连接建立请求消息中包括的CSFB指示信息判断该RRC建立请求是否由CSFB引起的，或者BSC/RNC可通过解析所述接续管理业务请求消息或位置区更新请求消息判断UE发起的电路域呼叫是否由CSFB引起的，或者在被叫场景下BSC/RNC也可通过解析寻呼响应消息判断UE发起的电路域呼叫是否由CSFB引起的；进一步地，由于UE的RAT改变了，UE经BSC/RNC向SGSN发送PS NAS消息，当BSC/RNC接收到所述PS NAS消息且确定所述UE正在进行CSFB呼叫时，BSC/RNC暂不向所述SGSN转发所述PS NAS消息，直至所述基站通过解析CS NAS消息(如振铃消息、会话确认消息等)确定CS RAB建立完成或所述CSFB呼叫已进入振铃状态之后立即将所述PS NAS消息转发给所述SGSN，从而延迟PS RAB的建立，保证CS RAB先于PS RAB建立成功；另一方面，UE向网络侧MSC发送呼叫建立消息，所述MSC在收到所述呼叫建立消息后要求BSC/RNC为所述UE分配合适的CS RAB，后续所述MSC及其他网络侧设备会对主叫UE发起的会话进行处理，如将会话请求发往被叫UE，被叫UE在收到会话请求时触发振铃并向主叫UE发送回铃音，其中，当主叫UE听到回铃音时，整个CS会话建立成功。
图10为本发明实施例提供的一种CSFB呼叫建立方法流程图，如图10所示，当UE向LTE网络侧的MME发送一个NAS信令(如扩展业务请求消息)以触发CSFB流程后，所述MME向eNodeB发送S1-AP请求消息，其中，所述S1-AP请求消息中包含指示信息，所述指示信息用于告知所述eNodeB所述UE已发起CSFB呼叫；进一步地，所述eNodeB通过NACC或 者RRC连接释放等方式触发UE改变接入类型(也即为所述UE重新选网)，可选地，将所述UE的RAT从E-UTRAN改变为UTRAN/GERAN，从而使得UE回落到传统2G/3G网络；进一步地，支持CSFB且已回落至2G/3G网络的所述UE经BSC/RNC向网络侧MSC发送接续管理业务请求消息或位置区更新请求消息等；进一步地，由于UE的RAT改变了，UE向SGSN发送PS NAS消息，如RAU请求消息，所述SGSN会向所述UE原网络侧MME发送上下文请求消息，以获知所述UE的相关信息，其中，所述上下文请求消息用于获知所述UE的上下文信息，所述MME在接收到所述上下文请求消息后并不立即给SGSN回复所述UE的上下文信息(因SGSN未获取到UE的上下文信息，则PS流程暂停)，而通过开启第二定时器，超时后向所述SGSN发送所述UE的上下文信息，从而延迟PS RAB的建立，保证CS RAB先于PS RAB建立成功，可选地，所述第二定时器的预设时长可根据所述UE的路由区更新RAU定时器和所述SGSN中用于监督上下文请求流程的定时器的时长进行设计，在满足RAU过程和SGSN上下文获取过程未超时的前提下，所述第二定时器的预设时长应足够长，保证在所述UE的CSFB呼叫已进入振铃状态或者至少CS RAB建立完成后超时；另一方面，UE向网络侧MSC发送呼叫建立消息，所述MSC在收到所述呼叫建立消息后要求BSC/RNC为所述UE分配合适的CS RAB，后续所述MSC及其他网络侧设备会对主叫UE发起的会话进行处理，如将会话请求发往被叫UE，被叫UE在收到会话请求时触发振铃并向主叫UE发送回铃音，其中，当主叫UE听到回铃音时，整个CS会话建立成功；进一步地，所述SGSN获取到所述UE的上下文信息后，继续执行暂停的PS流程。
图11为本发明实施例提供的一种CSFB呼叫建立方法流程图，如图11所示，当UE向LTE网络侧的MME发送一个NAS信令(如扩展业务请求消息)以触发CSFB流程后，所述MME向eNodeB发送S1-AP请求消息，其中，所述S1-AP请求消息中包含指示信息，所述指示信息用于告知所述eNodeB所述UE已发起CSFB呼叫；进一步地，所述eNodeB通过NACC或者RRC连接释放等方式触发UE改变接入类型(也即为所述UE重新选网)，可选地，将所述UE的RAT从E-UTRAN改变为UTRAN/GERAN，从而使得UE回落到传统2G/3G网络；进一步地，支持CSFB且已回落至2G/3G网络 的所述UE经BSC/RNC向网络侧MSC发送接续管理业务请求消息；进一步地，由于UE的RAT改变了，UE向新PS核心网设备SGSN发送PS NAS消息，如RAU请求消息，所述SGSN会向所述UE原网络侧MME发送上下文请求消息，以获知所述UE的相关信息，其中，所述上下文请求消息用于获知所述UE的上下文信息，所述MME在接收到所述上下文请求消息后暂不响应SGSN的请求，也即并不立即给SGSN回复所述UE的上下文信息(因SGSN未获取到UE的上下文信息，则PS流程暂停)，继续等待MSC的通知，当MSC感知到CSFB呼叫已进入振铃状态或至少CS RAB已建立完成，则MSC向MME发送通知消息，所述通知消息用于告知MME所述电路域呼叫的状态，MME接收到所述通知消息后则停止等待，响应SGSN的请求，也即向所述SGSN发送所述UE的上下文信息，从而延迟PS RAB的建立，保证CS RAB先于PS RAB建立成功；另一方面，UE向网络侧MSC发送呼叫建立消息，所述MSC在收到所述呼叫建立消息后要求BSC/RNC为所述UE分配合适的CS RAB，后续所述MSC及其他网络侧设备会对主叫UE发起的会话进行处理，如将会话请求发往被叫UE，被叫UE在收到会话请求时触发振铃并向主叫UE发送回铃音，其中，当主叫UE听到回铃音时，整个CS会话建立成功；进一步地，所述SGSN获取到所述UE的上下文信息后，继续执行暂停的PS流程。
图12为本发明实施例提供的一种CSFB呼叫建立方法流程图，如图12所示，当UE向LTE网络侧的MME发送一个NAS信令(如扩展业务请求消息)以触发CSFB流程后，所述MME向eNodeB发送S1-AP请求消息，其中，所述S1-AP请求消息中包含指示信息，所述指示信息用于告知所述eNodeB所述UE已发起CSFB呼叫；进一步地，所述eNodeB通过NACC或者RRC连接释放等方式触发UE改变接入类型(也即为所述UE重新选网)，可选地，将所述UE的RAT从E-UTRAN改变为UTRAN/GERAN，从而使得UE回落到传统2G/3G网络；进一步地，支持CSFB且已回落至2G/3G网络的所述UE经BSC/RNC向网络侧MSC发送接续管理业务请求消息；进一步地，由于UE的RAT改变了，UE向新PS核心网设备SGSN发送PS NAS消息，如RAU请求消息，当SGSN接收到由所述UE发送的第一个PS NAS消息时，所述SGSN正常执行上行PS操作，其中，所述上行PS操作为SGSN 与核心网节点之间的交互操作，如向原网络侧MME获取所述UE的上下文信息、向HSS取用户签约数据/鉴权数据、更新HSS中的位置信息以及建立/更新GTP承载信息等，当SGSN通过解析从MME处获取到的所述UE的上下文信息判断出所述UE正在进行CSFB呼叫时，所述SGSN开启第三定时器，超时后执行下行PS操作，其中，所述下行PS操作为SGSN与所述UE和/或基站之间的交互操作，如向UE发送RAU请求接受消息以及向基站发送请求分配PS RAB的消息等过程，从而延迟PS RAB的建立，保证CS RAB先于PS RAB建立成功，可选地，所述第三定时器的预设时长需要根据所述UE的路由区更新RAU定时器时长进行设计，在满足RAU过程未超时的前提下，所述第三定时器的预设时长应足够长，保证在所述UE的CSFB呼叫已进入振铃状态或者至少CS RAB建立完成后超时；另一方面，UE向网络侧MSC发送呼叫建立消息，所述MSC在收到所述呼叫建立消息后要求BSC/RNC为所述UE分配合适的CS RAB，后续所述MSC及其他网络侧设备会对主叫UE发起的会话进行处理，如将会话请求发往被叫UE，被叫UE在收到会话请求时触发振铃并向主叫UE发送回铃音，其中，当主叫UE听到回铃音时，整个CS会话建立成功。
图13为本发明实施例提供的一种基站的示意图，如图13所示，本实施例提供的基站130包括：接收模块1301以及延迟模块1302。
其中，接收模块1301用于接收用户设备发送的分组交换非接入层PSNAS消息；其中，所述用户设备为经电路交换回落CSFB回落至第二代2G/第三代3G网络的用户设备；
延迟模块1302用于延迟向通用分组无线服务技术业务支撑节点SGSN发送所述PS NAS消息。
可选地，所述基站还包括：
确定模块，用于确定所述用户设备正在进行CSFB呼叫。
可选地，所述确定模块具体用于：
根据所述用户设备发送的第一电路交换非接入层CS NAS消息，确定所述用户设备正在进行CSFB呼叫；其中，所述第一CS NAS消息包括下述消息中的至少一种：位置区更新请求消息及接续管理业务请求消息；或者，
根据所述用户设备发送的寻呼响应消息，确定所述用户设备正在进行 CSFB呼叫；或者，
根据所述用户设备发送的无线资源控制RRC连接建立请求消息确定所述用户设备正在进行CSFB呼叫。
可选地，所述延迟模块1302具体用于：
从所述接收模块接收到所述PS NAS消息开始，经过预设时长后，向所述SGSN转发所述PS NAS消息。
可选地，所述预设时长大于等于所述用户设备的电路交换无线接入承载CS RAB的建立时长，或者大于等于所述CSFB呼叫的建立时长。
可选地，所述延迟模块1302还具体用于：只有在接收到所述用户设备发送的电路交换无线承载CS RB建立完成消息之后，才将所述PS NAS消息转发给所述SGSN。
可选地，所述延迟模块1302还具体用于：只有在确定电路交换无线接入承载CS RAB建立完成或所述CSFB呼叫已进入振铃状态之后，才将所述PSNAS消息转发给所述SGSN。
可选地，所述延迟模块1302还具体用于：通过第二CS NAS消息，确定所述CS RAB建立完成或所述CSFB呼叫已进入振铃状态；其中，所述第二CS NAS消息包括振铃消息或者会话确认消息。
本实施例的基站，可以具体可以采用上述图1以及图7至图9中任一所述的CSFB呼叫建立方法实施例的技术方案，其实现原理和技术效果类似，此处不再赘述。
图14为本发明实施例提供的一种基站的示意图，如图14所示，本实施例提供的基站140包括处理器1401和存储器1402。基站140还可以包括发射器1403及接收器1404。其中，发射器1403及接收器1404可以和处理器1401相连。其中，发射器1403用于发送数据或信息，接收器1404用于接收数据或信息，存储器1402用于存储执行指令，当基站140运行时，处理器1401与存储器1402之间通信，处理器1401调用存储器1402中的执行指令，用于执行图1以及图7至图9中任一所述的CSFB呼叫建立方法的方法流程。
本实施例的基站，可以用于执行本发明上述图1以及图7至图9中任一所述的CSFB呼叫建立方法的方法流程。
图15为本发明实施例提供的一种MME的示意图，如图15所示，本实 施例提供的MME 150包括：接收模块1501以及延迟模块1502。
其中，接收模块1501用于接收通用分组无线服务技术业务支撑节点SGSN发送的上下文请求消息，所述上下文请求消息用于请求获取所述用户设备的上下文信息；所述用户设备为经电路交换回落CSFB回落至第二代2G/第三代3G网络的用户设备；
延迟模块1502用于延迟向所述SGSN发送所述用户设备的上下文信息。
可选地，所述MME还包括：
确定模块，用于确定所述用户设备正在进行CSFB呼叫。
可选地，所述延迟模块1502具体用于：
从所述接收模块接收到所述上下文请求消息开始，经过预设时长后，向所述SGSN发送所述用户设备的上下文信息。
可选地，所述预设时长大于等于所述用户设备的电路交换无线接入承载CS RAB的建立时长，或者大于等于所述用户设备的CSFB呼叫的建立时长。
可选地，所述延迟模块1502具体用于：只有在确定所述用户设备的CSRAB建立完成或所述用户设备的CSFB呼叫已进入振铃状态，才将所述用户设备的上下文信息发送给所述SGSN。
本实施例的MME，具体采用图2、图10或图11所述的CSFB呼叫建立方法实施例的技术方案，其实现原理和技术效果类似，此处不再赘述。
本发明实施例提供的又一种MME的结构与上述图14类似，本实施例提供的MME包括处理器和存储器。MME还可以包括发射器及接收器。其中，发射器及接收器可以和处理器相连。其中，发射器用于发送数据或信息，接收器用于接收数据或信息，存储器用于存储执行指令，当MME运行时，处理器与存储器之间通信，处理器调用存储器中的执行指令，用于执行图2、图10或图11所述的CSFB呼叫建立方法的方法流程。
本实施例的MME，可以用于执行本发明上述图2、图10或图11所述的CSFB呼叫建立方法的方法流程。
图16为本发明实施例提供的一种MSC的示意图，如图16所示，本实施例提供的MSC 160包括：获取模块1601以及发送模块1602。
其中，获取模块1601用于获取电路交换回落CSFB呼叫状态；
发送模块1602用于当所述MSC确定CS RAB建立完成或所述CSFB呼 叫已进入振铃状态，向移动性管理实体MME发送通知消息，其中，所述通知消息用于告知所述MME CS呼叫状态。
本实施例的MSC，可以采用上述图3所述的CSFB呼叫建立方法实施例的技术方案，其实现原理和技术效果类似，此处不再赘述。
本发明实施例提供的又一种MSC的结构与上述图14类似，本实施例提供的MSC包括处理器和存储器。MSC还可以包括发射器及接收器。其中，发射器及接收器可以和处理器相连。其中，发射器用于发送数据或信息，接收器用于接收数据或信息，存储器用于存储执行指令，当MSC运行时，处理器与存储器之间通信，处理器调用存储器中的执行指令，用于执行图3所述的CSFB呼叫建立方法的方法流程。
本实施例的MSC，可以用于执行本发明上述图3所述的CSFB呼叫建立方法的方法流程。
图17为本发明实施例提供的一种SGSN的示意图，如图17所示，本实施例提供的SGSN 170包括：接收模块1701、上行操作模块1702及延迟模块1703。
其中，接收模块1701用于接收由用户设备发起的分组交换非接入层PSNAS消息；其中，所述用户设备为经电路交换回落CSFB回落至第二代2G/第三代3G网络的用户设备；
上行操作模块1702用于执行上行PS操作，其中，所述上行PS操作包括向移动性管理实体MME获取所述用户设备的上下文信息；
延迟模块1703用于延迟执行下行PS操作，所述下行PS操作为所述SGSN与所述用户设备或基站之间的交互操作。
可选地，所述SGSN还包括：
确定模块，用于确定所述用户设备正在进行电路交换回落CSFB呼叫。
可选地，所述确定模块具体用于：根据所述用户设备的上下文信息确定所述用户设备正在进行CSFB呼叫。
可选地，所述延迟模块1703具体用于：
从所述接收模块接收到所述PS NAS消息开始或从确定所述用户设备正在进行CSFB呼叫开始，经过预设时长后，执行下行PS操作。
可选地，所述预设时长大于等于所述用户设备的电路交换无线接入承载 CS RAB的建立时长，或者大于等于所述CSFB呼叫的建立时长。
可选地，所述下行PS操作包括：向所述用户设备发送路由区更新RAU请求接受消息；或者向所述基站发送请求消息，所述请求消息用于请求所述基站为所述用户设备分配分组交换无线接入承载PS RAB。
可选地，所述上行PS操作还包括：向归属用户设备服务器HSS获取所述用户设备的签约数据/鉴权数据；或者，更新所述HSS中的位置信息；或者建立/更新通用分组无线服务技术隧道协议GTP承载信息。
本实施例的SGSN，可以采用上述图4或图12所述的CSFB呼叫建立方法实施例的技术方案，其实现原理和技术效果类似，此处不再赘述。
本发明实施例提供的又一种SGSN的结构与上述图14类似，本实施例提供的SGSN包括处理器和存储器。SGSN还可以包括发射器及接收器。其中，发射器及接收器可以和处理器相连。其中，发射器用于发送数据或信息，接收器用于接收数据或信息，存储器用于存储执行指令，当SGSN运行时，处理器与存储器之间通信，处理器调用存储器中的执行指令，用于执行图4或图12所述的CSFB呼叫建立方法的方法流程。
本实施例的SGSN，可以用于执行本发明上述图4或图12所述的CSFB呼叫建立方法的方法流程。
图18为本发明实施例提供的又一种MME的示意图，如图18所示，本实施例提供的MME 180包括：接收模块1801及延迟模块1802。
其中，所述接收模块1801用于接收通用分组无线服务技术业务支撑节点SGSN发送的上下文请求消息，所述上下文请求消息用于请求获取用户设备的上下文信息；
延迟模块1802用于延迟向所述SGSN发送所述用户设备的上下文信息，以延迟所述用户设备的分组交换PS域鉴权过程。
可选地，所述延迟模块1802具体用于：
从所述接收模块接收到所述上下文请求消息开始，经过预设时长后，向所述SGSN发送所述用户的上下文信息。
可选地，所述预设时长大于移动交换中心MSC对所述用户设备的电路交换CS域鉴权流程所需时长。
可选地，所述预设时长小于所述用户设备中对应的PS业务定时器的时长 或小于所述SGSN中用于监督所述上下文请求流程的定时器的时长。
可选地，所述上下文信息包括如下信息中的至少一种：国际移动用户识别码IMSI信息、演进分组系统EPS承载上下文信息及安全密钥信息。
本实施例的MME，可以采用本发明上述图5所述的无线通信系统中的鉴权方法实施例的技术方案，其实现原理和技术效果类似，此处不再赘述。
本发明实施例提供的又一种MME的结构与上述图14类似，本实施例提供的MME包括处理器和存储器。MME还可以包括发射器及接收器。其中，发射器及接收器可以和处理器相连。其中，发射器用于发送数据或信息，接收器用于接收数据或信息，存储器用于存储执行指令，当MME运行时，处理器与存储器之间通信，处理器调用存储器中的执行指令，用于执行图5所述的无线通信系统中的鉴权方法的方法流程。
本实施例的MME，可以用于执行本发明上述图5所述的无线通信系统中的鉴权方法的方法流程。
图19为本发明实施例提供的又一种SGSN的示意图，如图19所示，本实施例提供的SGSN 190包括：接收模块1901、上行操作模块1902及延迟模块1903。
其中，所述接收模块1901用于接收由用户设备发起的分组交换非接入层PS NAS消息；
所述上行操作模块1903用于执行上行PS操作，其中，所述上行PS操作包括向移动性管理实体MME获取所述用户设备的上下文信息；
所述延迟模块1903用于延迟向所述用户设备发送PS域鉴权请求消息，以延迟所述用户设备的PS域鉴权流程。
可选地，所述延迟模块1903具体用于：
从所述接收模块接收到所述PS NAS消息开始，经过预设时长后，向所述用户设备发送所述PS域鉴权请求消息。
可选地，所述预设时长大于移动交换中心MSC对所述用户设备的电路交换CS域鉴权流程所需时长。
可选地，所述预设时长小于所述用户设备中对应的PS业务定时器的时长。
可选地，所述SGSN还包括：
判断模块，用于判断所述用户设备是否为来自长期演进LTE网络的用户设备，当确定所述用户设备为来自长期演进LTE网络的用户设备时，所述延迟模块延迟向所述用户设备发送PS域鉴权请求消息，以延迟所述用户设备的PS域鉴权流程。
可选地，所述判断模块具体用于：根据所述用户设备发送的所述PS NAS消息，判断所述用户设备是否来为来自LTE网络的用户设备。
可选地，所述上行PS操作还包括：向归属用户设备服务器HSS获取所述用户设备的签约数据/鉴权数据；或者，更新所述HSS中的位置信息。
本实施例的SGSN，可以采用本发明上述图6所述的无线通信系统中的鉴权方法实施例的技术方案，其实现原理和技术效果类似，此处不再赘述。
本发明实施例提供的又一种SGSN的结构与上述图14类似，本实施例提供的SGSN包括处理器和存储器。SGSN还可以包括发射器及接收器。其中，发射器及接收器可以和处理器相连。其中，发射器用于发送数据或信息，接收器用于接收数据或信息，存储器用于存储执行指令，当SGSN运行时，处理器与存储器之间通信，处理器调用存储器中的执行指令，用于执行图6所述的无线通信系统中的鉴权方法的方法流程。
本实施例的SGSN，可以用于执行本发明上述图6所述的无线通信系统中的鉴权方法的方法流程。
本领域普通技术人员可以理解：实现上述各方法实施例的全部或部分步骤可以通过程序指令相关的硬件来完成。前述的程序可以存储于一计算机可读取存储介质中。该程序在执行时，执行包括上述各方法实施例的步骤；而前述的存储介质包括：ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
最后应说明的是：以上各实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述各实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。

Claims (64)

  1. 一种电路交换回落CSFB呼叫建立方法，其特征在于，包括：
    基站接收用户设备发送的分组交换非接入层PS NAS消息；其中，所述用户设备为经电路交换回落CSFB回落至第二代2G/第三代3G网络的用户设备；
    所述基站延迟向通用分组无线服务技术业务支撑节点SGSN发送所述PS NAS消息。
  2. 根据权利要求1所述的方法，其特征在于，所述基站延迟向通用分组无线服务技术业务支撑节点SGSN发送所述PS NAS消息之前，所述方法还包括：
    所述基站确定所述用户设备正在进行CSFB呼叫。
  3. 根据权利要求2所述的方法，其特征在于，所述基站确定所述用户设备正在进行CSFB呼叫，包括：
    所述基站根据所述用户设备发送的第一电路交换非接入层CS NAS消息，确定所述用户设备正在进行CSFB呼叫；其中，所述第一CS NAS消息包括下述消息中的至少一种：位置区更新请求消息及接续管理业务请求消息；或者，
    所述基站根据所述用户设备发送的寻呼响应消息，确定所述用户设备正在进行CSFB呼叫；或者，
    所述基站根据所述用户设备发送的无线资源控制RRC连接建立请求消息确定所述用户设备正在进行CSFB呼叫。
  4. 根据权利要求1-3中任一项所述的方法，其特征在于，所述基站延迟向通用分组无线服务技术业务支撑节点SGSN发送所述PS NAS消息，包括：
    从所述基站接收到所述PS NAS消息开始，经过预设时长后，所述基站向所述SGSN转发所述PS NAS消息。
  5. 根据权利要求4所述的方法，其特征在于，所述预设时长大于等于所述用户设备的电路交换无线接入承载CS RAB的建立时长，或者大于等于所述CSFB呼叫的建立时长。
  6. 根据权利要求1-3中任一项所述的方法，其特征在于，所述基站延迟向通用分组无线服务技术业务支撑节点SGSN发送所述PS NAS消息，包括：
    所述基站只有在接收到所述用户设备发送的电路交换无线承载CS RB建立完成消息之后，才将所述PS NAS消息转发给所述SGSN。
  7. 根据权利要求1-3中任一项所述的方法，其特征在于，所述基站延迟向通用分组无线服务技术业务支撑节点SGSN发送所述PS NAS消息，包括：
    所述基站只有在确定电路交换无线接入承载CS RAB建立完成或所述CSFB呼叫已进入振铃状态之后，才将所述PS NAS消息转发给所述SGSN。
  8. 根据权利要求7所述的方法，其特征在于，所述方法还包括：
    所述基站通过第二CS NAS消息，确定所述CS RAB建立完成或所述CSFB呼叫已进入振铃状态；其中，所述第二CS NAS消息包括振铃消息或者会话确认消息。
  9. 一种电路交换回落CSFB呼叫建立方法，其特征在于，包括：
    移动性管理实体MME接收通用分组无线服务技术业务支撑节点SGSN发送的上下文请求消息，所述上下文请求消息用于请求获取用户设备的上下文信息；所述用户设备为经电路交换回落CSFB回落至第二代2G/第三代3G网络的用户设备；
    所述MME延迟向所述SGSN发送所述用户设备的上下文信息。
  10. 根据权利要求9所述的方法，其特征在于，所述MME延迟向所述SGSN发送所述用户设备的上下文信息之前，还包括：
    所述MME确定所述用户设备正在进行CSFB呼叫。
  11. 根据权利要求9或10所述的方法，其特征在于，所述MME延迟向所述SGSN发送所述用户设备的上下文信息，包括：
    所述MME从接收到所述上下文请求消息开始，经过预设时长后，向所述SGSN发送所述用户设备的上下文信息。
  12. 根据权利要求11所述的方法，其特征在于，所述预设时长大于等于所述用户设备的电路交换无线接入承载CS RAB的建立时长，或者大于等于所述用户设备的CSFB呼叫的建立时长。
  13. 根据权利要求9或10所述的方法，其特征在于，所述MME延迟向所述SGSN发送所述用户设备的上下文信息，包括：
    所述MME只有在确定所述用户设备的CS RAB建立完成或所述用户设备的CSFB呼叫已进入振铃状态，才将所述用户设备的上下文信息发送给所 述SGSN。
  14. 一种电路交换回落CSFB呼叫建立方法，其特征在于，包括：
    通用分组无线服务技术业务支撑节点SGSN接收由用户设备发起的分组交换非接入层PS NAS消息；其中，所述用户设备为经电路交换回落CSFB回落至第二代2G/第三代3G网络的用户设备；
    所述SGSN执行上行PS操作，其中，所述上行PS操作包括向移动性管理实体MME获取所述用户设备的上下文信息；
    所述SGSN延迟执行下行PS操作，所述下行PS操作为所述SGSN与所述用户设备或基站之间的交互操作。
  15. 根据权利要求14所述的方法，其特征在于，所述SGSN延迟执行下行PS操作之前，还包括：
    所述SGSN确定所述用户设备正在进行电路交换回落CSFB呼叫。
  16. 根据权利要求15所述的方法，其特征在于，所述SGSN确定所述用户设备正在进行电路交换回落CSFB呼叫，包括：
    所述SGSN根据所述用户设备的上下文信息确定所述用户设备正在进行CSFB呼叫。
  17. 根据权利要求15或16所述的方法，其特征在于，所述SGSN延迟执行下行PS操作，包括：
    所述SGSN从接收到所述PS NAS消息开始或从确定所述用户设备正在进行CSFB呼叫开始，经过预设时长后，执行下行PS操作。
  18. 根据权利要求17所述的方法，其特征在于，所述预设时长大于等于所述用户设备的电路交换无线接入承载CS RAB的建立时长，或者大于等于所述CSFB呼叫的建立时长。
  19. 根据权利要求14-18中任一项所述的方法，其特征在于，所述下行PS操作包括：向所述用户设备发送路由区更新RAU请求接受消息；或者向所述基站发送请求消息，所述请求消息用于请求所述基站为所述用户设备分配分组交换无线接入承载PS RAB。
  20. 根据权利要求14-19中任一项所述的方法，其特征在于，所述上行PS操作还包括：向归属用户设备服务器HSS获取所述用户设备的签约数据/鉴权数据；或者，更新所述HSS中的位置信息；或者建立/更新通 用分组无线服务技术隧道协议GTP承载信息。
  21. 一种无线通信系统中的鉴权方法，其特征在于，包括：
    移动性管理实体MME接收通用分组无线服务技术业务支撑节点SGSN发送的上下文请求消息，所述上下文请求消息用于请求获取用户设备的上下文信息；
    所述MME延迟向所述SGSN发送所述用户设备的上下文信息，以延迟所述用户设备的分组交换PS域鉴权过程。
  22. 根据权利要求21所述的方法，其特征在于，所述MME延迟向所述SGSN发送所述用户设备的上下文信息，包括：
    所述MME从接收到所述上下文请求消息开始，经过预设时长后，向所述SGSN发送所述用户的上下文信息。
  23. 根据权利要求22所述的方法，其特征在于，所述预设时长大于移动交换中心MSC对所述用户设备的电路交换CS域鉴权流程所需时长。
  24. 根据权利要求22或23所述的方法，其特征在于，所述预设时长小于所述用户设备中对应的PS业务定时器的时长或小于所述SGSN中用于监督所述上下文请求流程的定时器的时长。
  25. 根据权利要求21-24任一项所述的方法，其特征在于，所述上下文信息包括如下信息中的至少一种：国际移动用户识别码IMSI信息、演进分组系统EPS承载上下文信息及安全密钥信息。
  26. 一种无线通信系统中的鉴权方法，其特征在于，包括：
    通用分组无线服务技术业务支撑节点SGSN接收由用户设备发起的分组交换非接入层PS NAS消息；
    所述SGSN执行上行PS操作，其中，所述上行PS操作包括向移动性管理实体MME获取所述用户设备的上下文信息；
    所述SGSN延迟向所述用户设备发送PS域鉴权请求消息，以延迟所述用户设备的PS域鉴权流程。
  27. 根据权利要求26所述的方法，其特征在于，所述SGSN延迟向所述用户设备发送PS域鉴权请求消息，包括：
    所述SGSN从接收到所述PS NAS消息开始，经过预设时长后，向所述用户设备发送所述PS域鉴权请求消息。
  28. 根据权利要求27所述的方法，其特征在于，所述预设时长大于移动交换中心MSC对所述用户设备的电路交换CS域鉴权流程所需时长。
  29. 根据权利要求27或28所述的方法，其特征在于，所述预设时长小于所述用户设备中对应的PS业务定时器的时长。
  30. 根据权利要求26所述的方法，其特征在于，所述方法还包括：
    所述SGSN判断所述用户设备是否为来自长期演进LTE网络的用户设备，当确定所述用户设备为来自长期演进LTE网络的用户设备时，延迟向所述用户设备发送PS域鉴权请求消息，以延迟所述用户设备的PS域鉴权流程。
  31. 根据权利要求30所述的方法，其特征在于，所述SGSN判断所述用户设备是否为来自长期演进LTE网络的用户设备，包括：
    所述SGSN根据所述用户设备发送的所述PS NAS消息，判断所述用户设备是否来为来自LTE网络的用户设备。
  32. 根据权利要求26-31任一项所述的方法，其特征在于，所述上行PS操作还包括：向归属用户设备服务器HSS获取所述用户设备的签约数据/鉴权数据；或者，更新所述HSS中的位置信息。
  33. 一种基站，其特征在于，包括：
    接收模块，用于接收用户设备发送的分组交换非接入层PS NAS消息；其中，所述用户设备为经电路交换回落CSFB回落至第二代2G/第三代3G网络的用户设备；
    延迟模块，用于延迟向通用分组无线服务技术业务支撑节点SGSN发送所述PS NAS消息。
  34. 根据权利要求33所述的基站，其特征在于，还包括：
    确定模块，用于确定所述用户设备正在进行CSFB呼叫。
  35. 根据权利要求34所述的基站，其特征在于，所述确定模块具体用于：
    根据所述用户设备发送的第一电路交换非接入层CS NAS消息，确定所述用户设备正在进行CSFB呼叫；其中，所述第一CS NAS消息包括下述消息中的至少一种：位置区更新请求消息及接续管理业务请求消息；或者，
    根据所述用户设备发送的寻呼响应消息，确定所述用户设备正在进行CSFB呼叫；或者，
    根据所述用户设备发送的无线资源控制RRC连接建立请求消息确定所 述用户设备正在进行CSFB呼叫。
  36. 根据权利要求33-35中任一项所述的基站，其特征在于，所述延迟模块具体用于：
    从所述接收模块接收到所述PS NAS消息开始，经过预设时长后，向所述SGSN转发所述PS NAS消息。
  37. 根据权利要求36所述的基站，其特征在于，所述预设时长大于等于所述用户设备的电路交换无线接入承载CS RAB的建立时长，或者大于等于所述CSFB呼叫的建立时长。
  38. 根据权利要求33-35中任一项所述的基站，其特征在于，所述延迟模块具体用于：
    只有在接收到所述用户设备发送的电路交换无线承载CS RB建立完成消息之后，才将所述PS NAS消息转发给所述SGSN。
  39. 根据权利要求33-35中任一项所述的基站，其特征在于，所述延迟模块具体用于：
    只有在确定电路交换无线接入承载CS RAB建立完成或所述CSFB呼叫已进入振铃状态之后，才将所述PS NAS消息转发给所述SGSN。
  40. 根据权利要求39所述的基站，其特征在于，所述延迟模块还具体用于：通过第二CS NAS消息，确定所述CS RAB建立完成或所述CSFB呼叫已进入振铃状态；其中，所述第二CS NAS消息包括振铃消息或者会话确认消息。
  41. 一种移动性管理实体MME，其特征在于，包括：
    接收模块，用于接收通用分组无线服务技术业务支撑节点SGSN发送的上下文请求消息，所述上下文请求消息用于请求获取所述用户设备的上下文信息；所述用户设备为经电路交换回落CSFB回落至第二代2G/第三代3G网络的用户设备；
    延迟模块，用于延迟向所述SGSN发送所述用户设备的上下文信息。
  42. 根据权利要求41所述的MME，其特征在于，还包括：
    确定模块，用于确定所述用户设备正在进行CSFB呼叫。
  43. 根据权利要求41或42所述的MME，其特征在于，所述延迟模块具体用于：
    从所述接收模块接收到所述上下文请求消息开始，经过预设时长后，向所述SGSN发送所述用户设备的上下文信息。
  44. 根据权利要求43所述的MME，其特征在于，所述预设时长大于等于所述用户设备的电路交换无线接入承载CS RAB的建立时长，或者大于等于所述用户设备的CSFB呼叫的建立时长。
  45. 根据权利要求41或42所述的MME，其特征在于，所述延迟模块具体用于：
    只有在确定所述用户设备的CS RAB建立完成或所述用户设备的CSFB呼叫已进入振铃状态，才将所述用户设备的上下文信息发送给所述SGSN。
  46. 一种通用分组无线服务技术业务支撑节点SGSN，其特征在于，包括：
    接收模块，用于接收由用户设备发起的分组交换非接入层PS NAS消息；其中，所述用户设备为经电路交换回落CSFB回落至第二代2G/第三代3G网络的用户设备；
    上行操作模块，用于执行上行PS操作，其中，所述上行PS操作包括向移动性管理实体MME获取所述用户设备的上下文信息；
    延迟模块，用于延迟执行下行PS操作，所述下行PS操作为所述SGSN与所述用户设备或基站之间的交互操作。
  47. 根据权利要求46所述的SGSN，其特征在于，还包括：
    确定模块，用于确定所述用户设备正在进行电路交换回落CSFB呼叫。
  48. 根据权利要求47所述的SGSN，其特征在于，所述确定模块具体用于：根据所述用户设备的上下文信息确定所述用户设备正在进行CSFB呼叫。
  49. 根据权利要求47或48所述的SGSN，其特征在于，所述延迟模块具体用于：
    从所述接收模块接收到所述PS NAS消息开始或从确定所述用户设备正在进行CSFB呼叫开始，经过预设时长后，执行下行PS操作。
  50. 根据权利要求49所述的SGSN，其特征在于，所述预设时长大于等于所述用户设备的电路交换无线接入承载CS RAB的建立时长，或者大于等于所述CSFB呼叫的建立时长。
  51. 根据权利要求46-50中任一项所述的SGSN，其特征在于，所述下行 PS操作包括：向所述用户设备发送路由区更新RAU请求接受消息；或者向所述基站发送请求消息，所述请求消息用于请求所述基站为所述用户设备分配分组交换无线接入承载PS RAB。
  52. 根据权利要求46-51中任一项所述的SGSN，其特征在于，所述上行PS操作还包括：向归属用户设备服务器HSS获取所述用户设备的签约数据/鉴权数据；或者，更新所述HSS中的位置信息；或者建立/更新通用分组无线服务技术隧道协议GTP承载信息。
  53. 一种移动性管理实体MME，其特征在于，包括：
    接收模块，用于接收通用分组无线服务技术业务支撑节点SGSN发送的上下文请求消息，所述上下文请求消息用于请求获取用户设备的上下文信息；
    延迟模块，用于延迟向所述SGSN发送所述用户设备的上下文信息，以延迟所述用户设备的分组交换PS域鉴权过程。
  54. 根据权利要求53所述的MME，其特征在于，所述延迟模块具体用于：
    从所述接收模块接收到所述上下文请求消息开始，经过预设时长后，向所述SGSN发送所述用户的上下文信息。
  55. 根据权利要求54所述的MME，其特征在于，所述预设时长大于移动交换中心MSC对所述用户设备的电路交换CS域鉴权流程所需时长。
  56. 根据权利要求54或55所述的MME，其特征在于，所述预设时长小于所述用户设备中对应的PS业务定时器的时长或小于所述SGSN中用于监督所述上下文请求流程的定时器的时长。
  57. 根据权利要求53-56任一项所述的MME，其特征在于，所述上下文信息包括如下信息中的至少一种：国际移动用户识别码IMSI信息、演进分组系统EPS承载上下文信息及安全密钥信息。
  58. 一种通用分组无线服务技术业务支撑节点SGSN，其特征在于，包括：
    接收模块，用于接收由用户设备发起的分组交换非接入层PS NAS消息；
    上行操作模块，用于执行上行PS操作，其中，所述上行PS操作包括向移动性管理实体MME获取所述用户设备的上下文信息；
    延迟模块，用于延迟向所述用户设备发送PS域鉴权请求消息，以延迟所述用户设备的PS域鉴权流程。
  59. 根据权利要求58所述的SGSN，其特征在于，所述延迟模块具体用于：
    从所述接收模块接收到所述PS NAS消息开始，经过预设时长后，向所述用户设备发送所述PS域鉴权请求消息。
  60. 根据权利要求59所述的SGSN，其特征在于，所述预设时长大于移动交换中心MSC对所述用户设备的电路交换CS域鉴权流程所需时长。
  61. 根据权利要求59或60所述的SGSN，其特征在于，所述预设时长小于所述用户设备中对应的PS业务定时器的时长。
  62. 根据权利要求58所述的SGSN，其特征在于，还包括：
    判断模块，用于判断所述用户设备是否为来自长期演进LTE网络的用户设备，当确定所述用户设备为来自长期演进LTE网络的用户设备时，所述延迟模块延迟向所述用户设备发送PS域鉴权请求消息，以延迟所述用户设备的PS域鉴权流程。
  63. 根据权利要求62所述的SGSN，其特征在于，所述判断模块具体用于：
    根据所述用户设备发送的所述PS NAS消息，判断所述用户设备是否来为来自LTE网络的用户设备。
  64. 根据权利要求58-63任一项所述的SGSN，其特征在于，所述上行PS操作还包括：向归属用户设备服务器HSS获取所述用户设备的签约数据/鉴权数据；或者，更新所述HSS中的位置信息。
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