WO2018102970A1 - 一种创建语音承载的方法和装置 - Google Patents

一种创建语音承载的方法和装置 Download PDF

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Publication number
WO2018102970A1
WO2018102970A1 PCT/CN2016/108607 CN2016108607W WO2018102970A1 WO 2018102970 A1 WO2018102970 A1 WO 2018102970A1 CN 2016108607 W CN2016108607 W CN 2016108607W WO 2018102970 A1 WO2018102970 A1 WO 2018102970A1
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Prior art keywords
base station
indication information
target base
voice bearer
strength
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PCT/CN2016/108607
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English (en)
French (fr)
Inventor
辛阳
吴晓波
崇卫微
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 CN201680090877.1A priority Critical patent/CN109964505B/zh
Priority to PCT/CN2016/108607 priority patent/WO2018102970A1/zh
Publication of WO2018102970A1 publication Critical patent/WO2018102970A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements

Definitions

  • the present application relates to the field of communications, and in particular, to a method and apparatus for creating a voice bearer.
  • VoLTE Voice over LTE
  • IMS IP Multimedia Subsystem
  • Voice data is transmitted through IP (Internet Protocol) data packets. All services are carried on the LTE network, and data and voice can be realized. The business is unified under the same network.
  • an eNB E-UTRAN NodeB, an evolved network base station, where E-UTRAN is an abbreviation of "Evolved Universal Terrestrial Radio Access”
  • MME The E-RAB Setup (E-UTRAN Radio Access Bearer Setup) message of the Mobility Management Entity (Mobility Management Entity) performs a PS (Packet Switched) handover before the handover process.
  • the eNB receives the VoLTE bearer setup request message from the MME, the eNB should reject the request and inform the MME that the current eNB is performing the handover in the reject message. After receiving the reject message, the MME sets the local timer.
  • the MME After the eNB completes the handover or the timer expires (indicating the handover failure), the MME resends the E-RAB Setup message to the eNB.
  • the eNB here refers to the eNB after handover (ie, the target ENB), and when the handover fails.
  • the eNB here refers to the eNB before handover (ie, the source eNB).
  • the target eNB or the source eNB After receiving the E-RAB Setup message, the target eNB or the source eNB performs the remaining VoLTE bearer setup procedure.
  • the VoLTE bearer setup fails, and the AF (Application Function)
  • the calling UE sends a SIP (Session Initiation Protocol) message, and the calling UE sends an Extended Service Request message to the target eNB, triggering CSFB (Circuit Switched Fallback), and the called UE is called.
  • SIP Session Initiation Protocol
  • CSFB Circuit Switched Fallback
  • the AF needs to determine whether the VoLTE bearer of the target eNB is successfully established according to the message reported by the MME, and the MME needs to wait for a long time to determine whether the VoLTE dedicated bearer of the target eNB is successfully established, which greatly increases the establishment of the voice bearer. Delay.
  • the present application provides a method and an apparatus for creating a voice bearer.
  • the first indication information is obtained by the MME or the source eNB, where the first indication information is used to indicate whether the target eNB is Whether the strength of the PS voice bearer and/or the PS signal of the target eNB is greater than the strength threshold.
  • the MME sends the second directly to the gateway device.
  • the indication information is used to indicate that the PS voice bearer creation fails, so that the delay of the voice bearer establishment can be reduced.
  • a method for creating a voice bearer is provided, which is applied to a communication system including a calling terminal device, a source device of a called terminal device, and a target base station, where the source base station is a cell in which the calling terminal device is currently located.
  • the method includes: the MME acquiring first indication information from a tracking area to which the target base station belongs or the source base station, where An indication information is used to indicate whether the target base station supports a PS voice bearer, or the first indication information is used to indicate whether an intensity of a PS signal of the target base station is greater than or equal to an intensity threshold;
  • the second indication information is sent to the gateway device, where the second indication information is used to indicate the PS voice.
  • the bearer creation fails; or the MME determines that the target base station supports the PS voice bearer according to the first indication information and the target The intensity of the signal PS station is greater than or equal intensity threshold, send PS voice bearer establishment request message to the target base station.
  • the method for creating a voice bearer provided by the embodiment of the present application, after receiving the request message for creating a PS voice bearer, the MME queries whether the target base station supports the PS voice bearer, or instructs the source base station to query whether the target base station supports the PS voice bearer and/or target. Whether the strength of the PS signal of the base station satisfies the condition for establishing the PS voice bearer, so that the delay of establishing the voice bearer by the network device for the calling terminal device when the target base station cannot establish the PS voice bearer can be reduced, and the signaling overhead of the network device is reduced.
  • the method further includes: sending, by the MME, third indication information to the source base station, where the third indication information is used. Instructing the source base station to query the strength of the PS signal of the target base station; the MME receiving fourth indication information that is sent by the source base station according to the third indication information; and when the fourth indication information indicates the target base station When the strength of the PS signal is less than the strength threshold, the MME sends the second indication information to the gateway device according to the fourth indication information; and when the fourth indication information indicates the PS signal of the target base station The MME sends the request message for establishing a PS voice bearer to the target base station according to the fourth indication information, when the strength is greater than or equal to the strength threshold.
  • the MME may request the source base station to query whether the strength of the PS signal of the target base station satisfies the condition for establishing the PS voice bearer, thereby reducing the PS of the target base station.
  • the strength of the signal does not meet the delay of establishing a voice bearer for the calling terminal device when the condition for establishing the PS voice bearer is established, and the signaling overhead of the network device is reduced.
  • the MME receives the source base station according to The first indication information that is sent by the fifth indication information.
  • the MME indicates whether the source base station obtains whether the target base station has a PS voice bearer and/or the strength of the PS signal of the target base station is greater than or equal to an intensity threshold, so that the network device can reduce the time delay of the voice bearer to the calling terminal device.
  • a method for creating a voice bearer is provided, which is applied to a communication system including a calling terminal device, a called terminal device source base station, and a target base station, where the source base station is a cell in which the calling terminal device is currently located.
  • the method includes: the source base station acquiring first indication information, where the first indication information is used to indicate the target base station Whether the packet-switched PS voice bearer is supported, or the first indication information is used to indicate whether the strength of the PS signal of the target base station is greater than or equal to an intensity threshold; the source base station sends the first indication to the mobility management entity MME Information to facilitate the said The MME determines, according to the first indication information, whether the target base station can create a PS voice bearer.
  • the source base station acquires indication information for indicating whether the target base station supports the PS voice bearer and/or the strength of the PS signal of the target base station is greater than or equal to an intensity threshold, and the The indication information is sent to the MME.
  • the MME can report the PS voice bearer setup failure to the core network device without waiting for the calling terminal device to complete the base station handover, thereby reducing the calling terminal device. Start delay
  • the acquiring, by the source base station, the first indication information includes: the source base station receiving fifth indication information from the MME; and the source base station acquiring, according to the fifth indication information, the called terminal device First indication information.
  • the source base station determines, according to the indication information of the MME, whether the target base station supports the PS voice bearer and/or the strength of the PS signal of the target base station is greater than or equal to an intensity threshold, thereby reducing the network device as the calling party.
  • the terminal device establishes the delay of the voice bearer and better interfaces with the prior art, and has better compatibility.
  • the embodiment of the present application provides a device for creating a voice bearer, where the device can implement the functions performed by the MME in the method related to the foregoing aspect, where the function can be implemented by using hardware, or the corresponding software can be executed by hardware.
  • the hardware or software includes one or more corresponding units or modules of the above functions.
  • the apparatus includes a processor and a communication interface configured to support the apparatus to perform the corresponding functions of the above methods.
  • the communication interface is used to support communication between the device and other network elements.
  • the apparatus can also include a memory for coupling with the processor that retains the program instructions and data necessary for the apparatus.
  • the embodiment of the present application provides a device for creating a voice bearer, where the device can implement the functions performed by the source base station in the method related to the foregoing aspect, and the function may be implemented by using hardware, or may be performed by hardware.
  • Software Implementation The hardware or software includes one or more corresponding units or modules of the above functions.
  • the apparatus includes a processor and a communication interface configured to support the apparatus to perform the corresponding functions of the above methods.
  • the communication interface is used to support communication between the device and other network elements.
  • the apparatus can also include a memory for coupling with the processor that retains the program instructions and data necessary for the apparatus.
  • the embodiment of the present application provides a communication system, where the system includes the above aspects. MME and source base station.
  • the embodiment of the present application provides a computer storage medium for storing computer software instructions used by the MME, which includes a program designed to perform the above aspects.
  • the embodiment of the present application provides a computer storage medium for storing computer software instructions used by the source base station, which includes a program designed to perform the above aspects.
  • the MME or the source base station determines whether the target base station can establish a VoLTE bearer by using the query, and may perform other methods in time when the target base station cannot establish the VoLTE bearer.
  • the calling terminal device establishes a voice bearer, thereby reducing the delay of the calling terminal device to establish a voice bearer, and reducing the signaling overhead of the network device.
  • FIG. 1 is a schematic diagram of a possible communication system to which an embodiment of the present application is applied;
  • FIG. 2 is a schematic flowchart of a method for creating a voice bearer according to an embodiment of the present application
  • FIG. 3 is a schematic flowchart of another method for creating a voice bearer according to an embodiment of the present application
  • FIG. 4 is a schematic diagram of communication of a method for creating a voice bearer according to an embodiment of the present application
  • FIG. 5 is a schematic diagram of communication of another method for creating a voice bearer according to an embodiment of the present application.
  • FIG. 6 is a schematic diagram of communication of another method for creating a voice bearer according to an embodiment of the present application.
  • FIG. 7A is a schematic structural diagram of a possible MME according to an embodiment of the present application.
  • FIG. 7B is a schematic structural diagram of another possible MME provided by an embodiment of the present application.
  • FIG. 8A is a schematic structural diagram of a possible source base station according to an embodiment of the present application.
  • FIG. 8B is a schematic structural diagram of another possible source base station according to an embodiment of the present application.
  • the communication system includes a source base station 110, a target base station 120, a calling terminal device 130, and a core network device 140.
  • the calling terminal device 130 may be a UE, or may be another type of terminal device.
  • the terminal device 130 may also be a terminal device or a wearable electronic device in a 5G (5th-generation, 5th generation mobile communication system).
  • the calling terminal device 130 can initiate the call termination through the source base station 110 or the target base station 120.
  • the voice call of the end device wherein the source base station 110 is the base station currently accessed by the calling terminal device 130, and the target base station 120 is the base station to which the calling terminal device 130 is ready to handover.
  • the core network device 140 sends a create bearer request message to the source base station 110 or the target base station 120, requesting the source base station 110 or the target base station 120 to be the calling terminal device 130 and
  • the called terminal device establishes a voice bearer.
  • FIG. 2 is a schematic diagram of communication of a method for creating a voice bearer according to an embodiment of the present disclosure. As shown in FIG. 2, the method 200 includes:
  • the mobility management entity MME acquires first indication information from a tracking area or a source base station to which the target base station belongs, where the first indication information is used to indicate whether the target base station supports a packet-switched PS voice bearer and/or the target base station. Whether the strength of the PS signal is greater than or equal to the intensity threshold.
  • the MME may query the target base station to support the VoLTE, or may indicate to the source base station whether the target base station supports the PS voice.
  • the bearer ie, whether VoLTE is supported
  • the bearer may also instruct the source base station to query whether the strength of the PS signal (ie, the VoLTE signal) of the target base station satisfies the condition for establishing the PS voice bearer (eg, whether the strength of the PS signal is greater than an intensity threshold).
  • the MME may directly send an E-RAB Setup message to the source base station, and the source base station may actively query the target base station whether the E-RAB Setup message is received. Whether the strength of the PS signal supporting VoLTE and/or the target base station satisfies the condition for establishing a PS voice bearer.
  • the MME sends, according to the first indication information, that the target base station does not support the PS voice bearer or the strength of the PS signal of the target base station is less than the strength threshold, sending the second indication information to the gateway device.
  • the second indication information is used to indicate that the PS voice bearer creation fails. or,
  • the MME when determining, according to the first indication information, that the target base station supports a PS voice bearer, and the strength of the PS signal of the target base station is greater than or equal to the strength threshold, sending, by the target base station, a PS voice.
  • the request message carried.
  • the MME may request the establishment of the PS voice bearer directly after the handover of the base station by the calling terminal equipment; when the target base station does not satisfy the condition for establishing the PS voice bearer (That is, when the target base station does not support the PS voice bearer or the strength of the PS signal of the target base station is less than the strength threshold, the MME may send a request message for establishing a PS voice bearer to the target base station without waiting for the calling terminal device to complete the base station handover.
  • the feedback of the PS voice bearer to the core network device (for example, the gateway device) fails, so that the core network device can establish other types of voice bearers for the calling terminal device in time.
  • the MME after receiving the request message for creating a PS voice bearer, the MME queries whether the target base station supports the PS voice bearer, or instructs the source base station to query whether the target base station supports the PS voice bearer and/or Or whether the strength of the PS signal of the target base station satisfies the condition for establishing a PS voice bearer, thereby reducing the delay of establishing the voice bearer of the network device for the calling terminal device when the target base station cannot establish the PS voice bearer, and reducing the signaling of the network device. Overhead.
  • the method 200 further includes:
  • the MME sends third indication information to the source base station, where the third indication information is used to instruct the source base station to query the strength of the PS signal of the target base station.
  • the MME receives fourth indication information that is sent by the source base station according to the third indication information.
  • the MME sends the second indication information to the gateway device according to the fourth indication information.
  • the MME when the fourth indication information indicates that the strength of the PS signal of the target base station is greater than or equal to the strength threshold, the MME sends the established PS voice bearer to the target base station according to the fourth indication information. Request message.
  • the MME After the MME obtains the first indication information from the tracking area to which the target base station belongs, if the first indication information indicates that the target base station supports the PS voice bearer, the MME may send third indication information to the source base station, where the third indication information is used to indicate the source.
  • the base station queries the strength of the PS signal of the target base station.
  • the fourth indication information is sent to the MME.
  • the MME may send a request to the target base station to establish the PS voice. Bearer request message; when the fourth indication letter
  • the MME may determine that the target base station cannot establish a PS voice bearer, and send the second indication information to the gateway device, where the second indication information is used to indicate that the PS voice bearer creation fails.
  • the MME may request the source base station to query whether the strength of the PS signal of the target base station satisfies the condition for establishing the PS voice bearer, thereby reducing the target base station.
  • the strength of the PS signal does not satisfy the delay of establishing a voice bearer for the calling terminal device when the condition of establishing the PS voice bearer is established, and the signaling overhead of the network device is reduced.
  • the acquiring, by the MME, the first indication information from the source base station includes:
  • the MME sends a fifth indication information to the source base station, where the fifth indication information is used to indicate that the source base station determines whether the target base station supports a PS voice bearer and/or a PS signal of the target base station. Whether the intensity is greater than or equal to the intensity threshold.
  • the MME receives the first indication information that is sent by the source base station according to the fifth indication information.
  • the MME indicates whether the source base station acquires whether the target base station is a PS voice bearer and/or the strength of the PS signal of the target base station is greater than or equal to an intensity threshold.
  • the MME may send an E-RAB Setup request message to the source base station.
  • the E-RAB Setup request message carries the foregoing fifth indication information, so that the network device can reduce the delay of the voice bearer to the calling terminal device, and the interface is better connected with the prior art, and has better technology. compatibility.
  • the MME obtains whether the strength of the PS signal indicating whether the target base station supports the PS voice bearer and/or the target base station is greater than or equal to the intensity threshold.
  • the indication information when the target base station does not satisfy the condition for establishing the PS voice bearer, the MME can report the PS voice bearer setup failure to the core network device without waiting for the calling terminal device to complete the base station handover, thereby reducing the call origination of the calling terminal device. Delay.
  • FIG. 3 is a schematic diagram of communication of another method for creating a voice bearer according to an embodiment of the present disclosure. As shown in FIG. 3, the method 300 includes:
  • the source base station acquires first indication information, where the first indication information is used to indicate whether the target base station supports the PS voice bearer and/or the strength of the PS signal of the target base station is greater than or equal to an intensity threshold.
  • the source base station sends the first indication information to the MME, so that the MME determines, according to the first indication information, whether the target base station can create a PS voice bearer.
  • the source base station may send measurement indication information to the calling terminal device, indicating whether the calling terminal device measures whether the target base station supports the PS voice bearer, or instructs the calling terminal device to measure whether the strength of the PS signal of the target base station is The condition for establishing the PS voice bearer is satisfied, so as to obtain the first indication information, how the calling terminal device measures whether the target base station supports the PS voice bearer and the strength of the PS signal of the target base station can be determined according to the method in the prior art, and is no longer Narration.
  • the source base station may actively query whether the target base station supports the PS voice bearer and/or the strength of the PS signal of the target base station is greater than or equal to the strength threshold, and may also perform the foregoing operations according to the indication information of the MME.
  • the source base station After obtaining the first indication information, the source base station sends the first indication information to the MME, so that the MME determines whether the target base station can create a PS voice bearer according to the first indication information.
  • the obtaining, by the source base station, the first indication information includes:
  • the source base station receives fifth indication information from the MME.
  • the source base station acquires the first indication information from the calling terminal device according to the fifth indication information.
  • the source base station determines, according to the indication information of the MME, whether the target base station supports the PS voice bearer and/or the strength of the PS signal of the target base station is greater than or equal to an intensity threshold (ie, acquiring the first according to the fifth indication information. Instructing information), so that the network device can reduce the delay of the voice bearer to the calling terminal device, and better interface with the prior art, and has better compatibility.
  • the source base station acquires indication information indicating whether the target base station supports the PS voice bearer and/or the strength of the PS signal of the target base station is greater than or equal to the intensity threshold. And sending the indication information to the MME, when the target base station does not satisfy the condition for establishing the PS voice bearer, the MME can report the PS voice bearer establishment failure to the core network device without waiting for the calling terminal device to complete the base station handover, thereby reducing the main Calling the caller's call delay.
  • FIG. 4 is a schematic diagram of communication of a method for creating a voice bearer according to an embodiment of the present application. As shown in FIG. 4, the method 400 includes:
  • the calling UE ie, the calling terminal device
  • the AF sends an Authentication Authorization Request message (Authorize/Authenticate Request) to the PCRF (Policy and Charging Rules Function) entity.
  • Authorize/Authenticate Request Authentication Authorization Request message
  • PCRF Policy and Charging Rules Function
  • the PCRF entity sends a re-authentication request message (Re-Auth-Request) to the PGW (Packet Data Network Gateway), where the re-authentication request message includes a QSI (QoS Class Identifier), where "QoS” is the abbreviation of "Quality of Service”).
  • Re-Auth-Request a re-authentication request message
  • PGW Packet Data Network Gateway
  • QSI QoS Class Identifier
  • the PGW sends a re-authentication response message (Re-Auth-Answer) to the PCRF entity.
  • Re-Auth-Answer a re-authentication response message
  • the PCRF entity sends an authentication authorization response message (Authorize/Authenticate Answer) to the AF.
  • the MME determines that the Source eNB (source base station) is performing handover after receiving the Create Bearer Request from the SGW, and queries the Target eNB (target base station) where the TA (Tracking Area) does not support VoLTE, then the MME The MME shall send a Create Bearer Response message to the SGW, the message including the indication information indicating that the bearer request is failed to be created, and the message may further include a cause of creating a bearer failure (Cause).
  • a Create Bearer Response message to the SGW, the message including the indication information indicating that the bearer request is failed to be created, and the message may further include a cause of creating a bearer failure (Cause).
  • the AF sends an Authorize/Authenticate Request to the PCRF entity.
  • the PCRF entity sends a Re-Auth-Request to the PGW.
  • the PGW finds that the VoLTE-specific bearer of the calling UE fails to be created, and the PGW sends a Re-Auth-Answer to the PCRF, where the message includes an indication message indicating that the network-side bearer creation fails.
  • the PCRF sends an Authorize/Authenticate Answer to the AF, where the message includes an indication message indicating that the network side bearer creation fails.
  • the calling UE triggers the CSFB, and sends an extended service request message (Extended Service Request) to the target eNB, and the calling UE starts to try to establish a voice call in the CS domain.
  • Extended Service Request Extended Service Request
  • the method 400 for creating a voice bearer provided by the embodiment of the present application, after receiving the request message for creating a VoLTE bearer, the MME can query whether the target base station supports VoLTE, thereby reducing the network device as the calling terminal when the target base station cannot establish a VoLTE dedicated bearer. The device establishes the delay of the voice bearer and reduces the signaling overhead of the network device.
  • FIG. 5 is a schematic diagram of communication of another method for creating a voice bearer according to an embodiment of the present application, As shown in FIG. 5, the method 500 includes:
  • the calling UE initiates a VoLTE service establishment process to the called UE.
  • the AF sends an Authorize/Authenticate Request to the PCRF entity.
  • the PCRF entity sends a Re-Auth-Request to the PGW, where the Re-Auth-Request includes a QCI.
  • the PGW sends a Re-Auth-Answer to the PCRF entity.
  • the PCRF entity sends an Authorize/Authenticate Answer to the AF.
  • the MME determines that the Source eNB is performing handover, when the MME receives the Create Bearer Request from the SGW, the MME adds an indication (Indicator) to the E-RAB Setup Request sent to the Source eNB to instruct the Source eNB to determine.
  • the target base station is a condition for satisfying the creation of a VoLTE proprietary bearer.
  • the source eNB sends measurement indication information to the calling terminal device according to the indication information, instructing the calling terminal device to measure whether the target base station supports the VoLTE dedicated bearer, or instructing the calling terminal device to measure whether the strength of the VoLTE signal of the target base station is satisfied.
  • the condition of the VoLTE bearer when the source eNB determines that the target base station cannot establish the VoLTE dedicated bearer, sends an E-RAN Setup Response message (E-RAN Setup Response) to the MME, where the message carries the failure of the VoLTE dedicated bearer that creates the calling UE.
  • the information may also include the cause of the failure to create a bearer (Cause).
  • the MME sends a Create Bearer Response to the SGW, where the indication information indicates that the VoLTE-specific bearer creation fails, and the SGW notifies the PGW of the Create Bearer Response that fails to create the bearer.
  • S510 The AF sends an Authorize/Authenticate Request to the PCRF entity.
  • the PCRF entity sends a Re-Auth-Request to the PGW.
  • the PGW finds that the VoLTE-specific bearer of the calling UE fails to be created, and the PGW sends a Re-Auth-Answer to the PCRF, where the message includes an indication message indicating that the network-side bearer creation fails.
  • the PCRF sends an Authorize/Authenticate Answer to the AF, where the message includes an indication message indicating that the network side bearer creation fails.
  • the calling UE triggers the CSFB, and sends an Extended Service Request to the target eNB, and the calling UE starts to try to establish a voice call in the CS domain.
  • the method 500 for creating a voice bearer provided by the embodiment of the present application, after receiving the request message for creating a VoLTE bearer, the MME can query whether the target base station supports VoLTE, thereby reducing the network terminal as the calling terminal when the target base station cannot establish a VoLTE dedicated bearer.
  • the device establishes the delay of the voice bearer, and reduces the signaling overhead of the network device, and better reduces the delay of establishing the voice bearer of the network device as the calling terminal device, and better integrates with the existing technology, and has better Compatibility.
  • FIG. 6 is a schematic diagram of communication of a method for creating a voice bearer according to an embodiment of the present application. As shown in FIG. 6, the method 600 includes:
  • the calling UE initiates a VoLTE service establishment process to the called UE.
  • the AF sends an Authorize/Authenticate Request to the PCRF entity.
  • the PCRF entity sends a Re-Auth-Request to the PGW, where the Re-Auth-Request includes a QCI.
  • the PGW sends a Re-Auth-Answer to the PCRF entity.
  • the PCRF entity sends an Authorize/Authenticate Answer to the AF.
  • the MME sends an E-RAB Setup Request to the Source eNB.
  • the source eNB receives the E-RAB Setup Request from the MME and finds that it is performing the handover. However, the eNB does not support the weak coverage of the VoLTE signal in the cell where the VoLTE or the Target eNB is located, and the Source eNB directly rejects the E-RAB Setup Request.
  • S609 The MME sends a Create Bearer Response to the SGW, where the indication information indicates that the VoLTE dedicated bearer creation fails, and the SGW informs the PGW of the Create Bearer Response that fails to create the bearer.
  • S610 The AF sends an Authorize/Authenticate Request to the PCRF entity.
  • the PCRF entity sends a Re-Auth-Request to the PGW.
  • the PGW finds that the VoLTE dedicated bearer of the calling UE fails to be created, and the PGW sends the PCRF to the PCRF.
  • a Re-Auth-Answer is sent, and the message includes an indication message indicating that the network side bearer creation fails.
  • the PCRF sends an Authorize/Authenticate Answer to the AF, where the message includes an indication message indicating that the network side bearer creation fails.
  • the calling UE triggers the CSFB, and sends an Extended Service Request to the target eNB, and the calling UE starts to try to establish a voice call in the CS domain.
  • the method 600 for creating a voice bearer provided by the embodiment of the present application, after receiving the E-RAB Setup Request from the MME, the source base station actively queries whether the target base station supports the strength of the VoLTE signal of the VoLTE or the cell where the target base station is located, thereby reducing the target base station cannot be established.
  • the network equipment of the VoLTE-specific bearer establishes the delay of the voice bearer for the calling terminal device, and reduces the signaling overhead of the network device, and reduces the delay of the voice bearer of the network device to the calling terminal device. Good connection with existing technology, with better compatibility.
  • each network element such as an MME, a source base station, etc.
  • each network element such as an MME, a source base station, etc.
  • each network element includes hardware structures and/or software modules corresponding to each function.
  • the present application can be implemented in a combination of hardware or hardware and computer software in combination with the elements and algorithm steps of the various examples described in the embodiments disclosed herein. Whether a function is implemented in hardware or computer software to drive hardware depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present application.
  • the embodiments of the present application may perform functional unit division on the MME, the source base station, and the like according to the foregoing method.
  • each functional unit may be divided according to each function, or two or more functions may be integrated into one processing unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit. It should be noted that the division of the unit in the embodiment of the present application is schematic, and is only a logical function division. In actual implementation, there may be another division manner.
  • FIG. 7A shows a possible structural diagram of the MME involved in the above embodiment.
  • the MME 700 includes a processing unit 702 and a communication unit 703.
  • the processing unit 702 is configured to perform control management on the action of the MME 700.
  • the processing unit 702 is configured to support the MME 700 to perform S210, S230, and S230 of FIG. 2 through the communication unit 703.
  • the unit 702 can also be used to support the MME 700 via the communication unit 703 to perform S407 of FIG. 4, and/or other processes for the techniques described herein.
  • Communication unit 703 is used to support communication between MME 700 and other network entities, such as with the SGW shown in FIG.
  • the MME 700 may further include a storage unit 701 for storing program codes and data of the MME 700.
  • the processing unit 702 can be a processor or a controller, and can be, for example, a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), and an application-specific integrated circuit (Application-Specific). Integrated Circuit (ASIC), Field Programmable Gate Array (FPGA) or other programmable logic device, transistor logic device, hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure.
  • the processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like.
  • the communication unit 703 can be a communication interface, a transceiver, a transceiver circuit, etc., wherein the communication interface is a collective name and can include one or more interfaces.
  • the storage unit 701 can be a memory.
  • the MME involved in the embodiment of the present application may be the MME shown in FIG. 7B.
  • the MME 710 includes a processor 712, a communication interface 713, and a memory 711.
  • the communication interface 713, the processor 712, and the memory 711 can communicate with each other through an internal connection path to transfer control and/or data signals.
  • the MME provided by the embodiment of the present application obtains indication information indicating whether the strength of the PS signal supported by the target base station and/or the target base station is greater than or equal to the intensity threshold, when the target base station does not satisfy the establishment.
  • the MME can report the PS voice bearer establishment failure to the core network device without waiting for the calling terminal device to complete the base station handover, thereby reducing the calling delay of the calling terminal device.
  • FIG. 8A shows a possible structural diagram of the source base station involved in the above embodiment.
  • the source base station 800 includes a processing unit 802 and a communication unit 803.
  • the processing unit 802 is configured to perform control management on the action of the source base station 800.
  • the processing unit 802 is configured to support the source base station 800 by the communication unit 803 to perform S310 and S320 of FIG. 3, where the processing unit 802 may also be used to support source base station 800 via communication unit 803 to perform S508 of FIG. 5, and/or other processes for the techniques described herein.
  • Communication unit 803 is used to support communication between source base station 800 and other network entities, such as with the calling UE shown in FIG.
  • the source base station 800 may further include a storage unit 801 for storing program codes and data of the source base station 800.
  • the processing unit 802 can be a processor or a controller, such as a CPU, a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure.
  • the processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like.
  • the communication unit 803 can be a communication interface, a transceiver, a transceiver circuit, etc., wherein the communication interface is a collective name and can include one or more interfaces.
  • the storage unit 801 can be a memory.
  • the source base station involved in the embodiment of the present application may be the source base station shown in FIG. 8B.
  • the source base station 810 includes a processor 812, a communication interface 813, and a memory 811.
  • the communication interface 813, the processor 812, and the memory 811 can communicate with each other through an internal connection path to transfer control and/or data signals.
  • the source base station provided by the embodiment of the present application obtains indication information for indicating whether the strength of the PS signal supported by the target base station and/or the PS signal of the target base station is greater than or equal to the intensity threshold, and the indication information is obtained.
  • the MME can report the PS voice bearer setup failure to the core network device without waiting for the calling terminal device to complete the base station handover, thereby reducing the origin of the calling terminal device. Call time delay.
  • the size of the sequence number of each process does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present application.
  • the steps of the method or algorithm described in connection with the disclosure of the embodiments of the present application may be implemented in a hardware manner, or may be implemented by a processor executing software instructions.
  • the software instructions may be composed of corresponding software modules, which may be stored in a random access memory (RAM), a flash memory, a read only memory (ROM), an erasable programmable read only memory ( Erasable Programmable ROM (EPROM), electrically erasable programmable read only memory (EEPROM), registers, hard disk, removable hard disk, compact disk read only (CD-ROM) or any other form of storage medium known in the art.
  • An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium.
  • the storage medium can also be an integral part of the processor.
  • the processor and the storage medium can be located in an ASIC.
  • the ASIC can be located in the MME or source base station.
  • the processor and the storage medium may also exist as discrete components in the MME or source base station.
  • the functions described herein can be implemented in hardware, software, firmware, or any combination thereof.
  • the functions may be stored in a computer readable medium or transmitted as one or more instructions or code on a computer readable medium.
  • Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another.
  • a storage medium may be any available media that can be accessed by a general purpose or special purpose computer.

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Abstract

本申请公开了一种创建语音承载的方法和装置，该方法包括：移动性管理实体MME从所述目标基站所属的跟踪区域或者所述源基站获取第一指示信息，所述第一指示信息用于指示所述目标基站是否支持分组交换PS语音承载和/或所述目标基站的PS信号的强度是否大于或等于强度阈值；所述MME在所述目标基站不支持PS语音承载或者所述目标基站的PS信号的强度小于所述强度阈值时，向网关设备发送第二指示信息，所述第二指示信息用于指示PS语音承载创建失败。本申请实施例提供的创建语音承载的方法和装置，减小了主叫终端设备建立语音承载的时延，并且减少了网络设备的信令开销。

Description

一种创建语音承载的方法和装置 技术领域
本申请涉及通信领域，尤其涉及一种创建语音承载的方法和装置。
背景技术
LTE(Long Term Evolution，长期演进)网络的语音业务被称为VoLTE(Voice over LTE，基于长期演进网络的语音传输)业务，目前越来越多的运营商开始商用VoLTE业务，且越来越多的UE(User Equipment，用户设备)能够支持VoLTE业务。VoLTE是一种基于IMS(IP Multimedia Subsystem，互联网协议多媒体子系统)的语音业务，语音数据通过IP(Internet Protocol，互联网协议)数据包进行传输，全部业务承载于LTE网络上，可实现数据与语音业务在同一网络下的统一。
VoLTE业务建立过程中，若eNB(E-UTRAN NodeB，演进型网络基站，其中，E-UTRAN是“Evolved Universal Terrestrial Radio Access，演进型统一陆地无线接入网”的简称)在接收到来自MME(Mobility Management Entity，移动性管理实体)的E-RAB Setup(E-UTRAN Radio Access Bearer Setup，E-UTRAN无线接入承载建立)消息之前执行了PS(Packet Switched，分组交换)切换，在切换的过程中，如果eNB接收到了来自MME的VoLTE承载建立请求消息时，应该拒绝掉该请求，并在拒绝消息中告知MME当前eNB正在进行切换，MME接收到该拒绝消息后，设置本地定时器。MME在eNB切换完成或者定时器超时(表示切换失败)后，重新发送E-RAB Setup消息给eNB，切换成功时，这里的eNB是指切换后的eNB(即，目标ENB)，而切换失败时，这里的eNB是指切换前的eNB(即，源eNB)。目标eNB或者源eNB收到E-RAB Setup消息后，执行剩余的VoLTE承载建立流程。
在剩余的VoLTE承载建立流程中，如果目标eNB不支持VoLTE或者目标小区的VoLTE弱覆盖(即，PS信号的强度弱)，VoLTE承载建立会失败，这时AF(Application Function，应用功能实体)向主叫UE发送SIP(Session Initiation Protocol，会话初始协议)500消息，主叫UE向目标eNB发送扩展服务请求(Extended Service Request)消息，触发CSFB(Circuit Switched Fallback，电路域交换回落)，被叫UE选择CS(Circuit Switched，电路域交 换)域，通过CS域进行语音呼叫。
在上述流程中，AF需要根据MME上报的消息确定目标eNB的VoLTE承载是否成功建立，而MME需要等待很长时间才能确定目标eNB的VoLTE专有承载是否成功建立，这大大增加了语音承载建立的时延。
发明内容
有鉴于此，本申请提供了一种创建语音承载的方法和装置，在源eNB发送拒绝消息之前，通过MME或者源eNB获取第一指示信息，该第一指示信息用于指示所述目标eNB是否支持PS语音承载和/或所述目标eNB的PS信号的强度是否大于强度阈值，在目标eNB不支持PS语音承载或者目标eNB的PS信号的强度小于强度阈值时，MME直接向网关设备发送第二指示信息，所述第二指示信息用于指示PS语音承载创建失败，从而可以减少语音承载建立的时延。
一方面，提供了一种创建语音承载的方法，应用于包括主叫终端设备、被叫终端设备源基站和目标基站的通信系统中，所述源基站为所述主叫终端设备当前所在小区的基站，所述目标基站为所述主叫终端设备将要切换到的小区的基站，所述方法包括：MME从所述目标基站所属的跟踪区域或者所述源基站获取第一指示信息，所述第一指示信息用于指示所述目标基站是否支持PS语音承载，或所述第一指示信息用于指示所述目标基站的PS信号的强度是否大于或等于强度阈值；所述MME在根据所述第一指示信息确定所述目标基站不支持PS语音承载或者所述目标基站的PS信号的强度小于所述强度阈值时，向网关设备发送第二指示信息，所述第二指示信息用于指示PS语音承载创建失败；或者，所述MME在根据所述第一指示信息确定所述目标基站支持PS语音承载且所述目标基站的PS信号的强度大于或等于所述强度阈值时，向所述目标基站发送建立PS语音承载的请求消息。
本申请实施例提供的创建语音承载的方法，MME收到创建PS语音承载的请求消息后，通过查询目标基站是否支持PS语音承载，或者指示源基站查询目标基站是否支持PS语音承载和/或目标基站的PS信号的强度是否满足建立PS语音承载的条件，从而可以减少目标基站无法建立PS语音承载时网络设备为主叫终端设备建立语音承载的时延，并且减少了网络设备的信令开销。
可选地，当所述第一指示信息指示所述目标基站支持PS语音承载时，所述方法还包括：所述MME向所述源基站发送第三指示信息，所述第三指示信息用于指示所述源基站查询所述目标基站的PS信号的强度；所述MME接收所述源基站根据所述第三指示信息发送的第四指示信息；当所述第四指示信息指示所述目标基站的PS信号的强度小于所述强度阈值时，所述MME根据所述第四指示信息向所述网关设备发送所述第二指示信息；当所述第四指示信息指示所述目标基站的PS信号的强度大于或等于所述强度阈值时，所述MME根据所述第四指示信息向所述目标基站发送所述建立PS语音承载的请求消息。
本申请实施例提供的建立语音承载的方法，MME在确定目标基站支持PS语音承载后可以请求源基站查询目标基站的PS信号的强度是否满足建立PS语音承载的条件，从而可以减少目标基站的PS信号的强度不满足建立PS语音承载的条件时网络设备为主叫终端设备建立语音承载的时延，并且减少了网络设备的信令开销。
可选地，所述MME从所述源基站获取所述第一指示信息，包括：所述MME向所述源基站发送第五指示信息，所述第五指示信息用于指示所述源基站确定所述目标基站是否支持PS语音承载，或所述第五指示信息用于指示所述源基站确定所述目标基站的PS信号的强度是否大于或等于强度阈值；所述MME接收所述源基站根据所述第五指示信息发送的所述第一指示信息。
MME指示源基站获取目标基站是否PS语音承载和/或所述目标基站的PS信号的强度是否大于或等于强度阈值，从而可以在减小网络设备为主叫终端设备建立语音承载的时延的同时更好的与现有技术衔接，具备更好的技术兼容性。
另一方面，提供了一种创建语音承载的方法，应用于包括主叫终端设备、被叫终端设备源基站和目标基站的通信系统中，所述源基站为所述主叫终端设备当前所在小区的基站，所述目标基站为所述主叫终端设备将要切换到的小区的基站，所述方法包括：所述源基站获取第一指示信息，所述第一指示信息用于指示所述目标基站是否支持分组交换PS语音承载、或所述第一指示信息用于指示所述目标基站的PS信号的强度是否大于或等于强度阈值；所述源基站向移动性管理实体MME发送所述第一指示信息，以便于所述 MME根据所述第一指示信息确定所述目标基站是否可以创建PS语音承载。
本申请实施例提供的创建语音承载的方法，源基站获取用于指示目标基站是否支持PS语音承载和/或所述目标基站的PS信号的强度是否大于或等于强度阈值的指示信息，并将该指示信息发送给MME，当目标基站不满足建立PS语音承载的条件时，MME无需等待主叫终端设备完成基站切换即可向核心网设备反馈PS语音承载建立失败，从而减小了主叫终端设备的起呼时延
可选地，所述源基站获取第一指示信息包括：所述源基站从所述MME接收第五指示信息；所述源基站根据所述第五指示信息从所述主叫终端设备获取所述第一指示信息。
本申请实施例中，源基站根据MME的指示信息确定目标基站是否支持PS语音承载和/或所述目标基站的PS信号的强度是否大于或等于强度阈值，从而可以在减小网络设备为主叫终端设备建立语音承载的时延的同时更好的与现有技术衔接，具备更好的兼容性。
再一方面，本申请实施例提供了一种创建语音承载的装置，该装置可以实现上述方面所涉及方法中MME所执行的功能，所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个上述功能相应的单元或模块。
在一种可能的设计中，该装置的结构中包括处理器和通信接口，该处理器被配置为支持该装置执行上述方法中相应的功能。该通信接口用于支持该装置与其它网元之间的通信。该装置还可以包括存储器，该存储器用于与处理器耦合，其保存该装置必要的程序指令和数据。
再一方面，本申请实施例提供了一种创建语音承载的装置，该装置可以实现上述方面所涉及方法中源基站所执行的功能，所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个上述功能相应的单元或模块。
在一种可能的设计中，该装置的结构中包括处理器和通信接口，该处理器被配置为支持该装置执行上述方法中相应的功能。该通信接口用于支持该装置与其它网元之间的通信。该装置还可以包括存储器，该存储器用于与处理器耦合，其保存该装置必要的程序指令和数据。
再一方面，本申请实施例提供了一种通信系统，该系统包括上述方面所 述的MME和源基站。
再一方面，本申请实施例提供了一种计算机存储介质，用于储存为上述MME所用的计算机软件指令，其包含用于执行上述方面所设计的程序。
再一方面，本申请实施例提供了一种计算机存储介质，用于储存为上述源基站所用的计算机软件指令，其包含用于执行上述方面所设计的程序。
相比于现有技术，根据本申请实施例提供的创建语音承载的方法，通过MME或者源基站通过查询确定目标基站是否可以建立VoLTE承载，可以在目标基站不能建立VoLTE承载时及时通过其它方法为主叫终端设备建立语音承载，从而减小了主叫终端设备建立语音承载的时延，并且减少了网络设备的信令开销。
附图说明
图1是适用本申请实施例的一种可能的通信系统的示意图；
图2是本申请实施例提供的一种创建语音承载的方法的示意性流程图；
图3是本申请实施例提供的另一种创建语音承载的方法的示意性流程图；
图4是本申请实施例提供的一种创建语音承载的方法的通信示意图；
图5是本申请实施例提供的另一种创建语音承载的方法的通信示意图；
图6是本申请实施例提供的再一种创建语音承载的方法的通信示意图；
图7A是本申请实施例提供的一种可能的MME的结构示意图；
图7B是本申请实施例提供的另一种可能的MME的示意结构图；
图8A是本申请实施例提供的一种可能的源基站的结构示意图；
图8B是本申请实施例提供的另一种可能的源基站的结构示意图。
具体实施方式
图1为一种适用本申请实施例的通信系统100的示意图。如图1所示，该通信系统包括源基站110、目标基站120、主叫终端设备130、核心网设备140。其中，主叫终端设备130可以是UE，也可以是其它类型的终端设备，例如，终端设备130还可以5G(5th-Generation，第5代移动通信系统)中的终端设备或者可穿戴电子设备。
主叫终端设备130可以通过源基站110或者目标基站120发起对被叫终 端设备的语音呼叫，其中，源基站110是主叫终端设备130当前所接入的基站，目标基站120是主叫终端设备130准备切换到的基站。
当主叫终端设备130发起对被叫终端设备的语音呼叫后，核心网设备140向源基站110或者目标基站120发送创建承载请求消息，请求源基站110或者目标基站120为主叫终端设备130和被叫终端设备建立语音承载。
上述适用本申请实施例的通信系统100仅是举例说明，下面，将结合附图，对本申请实施例中的技术方案进行描述。
图2为本申请实施例提供的一种创建语音承载的方法的通信示意图，如图2所示，该方法200包括：
S210，移动性管理实体MME从目标基站所属的跟踪区域或者源基站获取第一指示信息，所述第一指示信息用于指示所述目标基站是否支持分组交换PS语音承载和/或所述目标基站的PS信号的强度是否大于或等于强度阈值。
作为一个可选的实施例，MME从SGW(Serving Gateway，服务网关)接收到创建PS语音承载的请求消息后，可以自己查询目标基站是否支持VoLTE，也可以指示源基站查询目标基站是否支持PS语音承载(即，是否支持VoLTE)，还可以指示源基站查询目标基站的PS信号(即，VoLTE信号)的强度是否满足建立PS语音承载的条件(例如，PS信号的强度是否大于强度阈值)。
作为另一个可选的实施例，MME从SGW接收到创建PS语音承载的请求消息后可以直接向源基站发送E-RAB Setup消息，源基站接收到该E-RAB Setup消息可以主动查询目标基站是否支持VoLTE和/或目标基站的PS信号的强度是否满足建立PS语音承载的条件。
S220，所述MME在根据所述第一指示信息确定所述目标基站不支持PS语音承载或者所述目标基站的PS信号的强度小于所述强度阈值时，向网关设备发送第二指示信息，所述第二指示信息用于指示PS语音承载创建失败。或者，
S230，所述MME在根据所述第一指示信息确定所述目标基站支持PS语音承载且所述目标基站的PS信号的强度大于或等于所述强度阈值时，向所述目标基站发送建立PS语音承载的请求消息。
当目标基站满足建立PS语音承载的条件(即，目标基站支持PS语音承 载且目标基站的PS信号的强度大于或等于强度阈值)时，MME可以待主叫终端设备切换基站完成后直接向目标基站请求建立PS语音承载；当目标基站不满足建立PS语音承载的条件(即，目标基站不支持PS语音承载或者目标基站的PS信号的强度小于强度阈值)时，MME可以无需等待主叫终端设备完成基站切换后再向目标基站发送建立PS语音承载的请求消息，可以直接向核心网设备(例如网关设备)反馈PS语音承载创建失败，从而，核心网设备可以及时为主叫终端设备建立其它类型的语音承载。
因此，本申请实施例提供的创建语音承载的方法，MME收到创建PS语音承载的请求消息后，通过查询目标基站是否支持PS语音承载，或者指示源基站查询目标基站是否支持PS语音承载和/或目标基站的PS信号的强度是否满足建立PS语音承载的条件，从而可以减少目标基站无法建立PS语音承载时网络设备为主叫终端设备建立语音承载的时延，并且减少了网络设备的信令开销。
可选地，当所述第一指示信息指示所述目标基站支持PS语音承载时，方法200还包括：
S240，所述MME向所述源基站发送第三指示信息，所述第三指示信息用于指示所述源基站查询所述目标基站的PS信号的强度。
S250，所述MME接收所述源基站根据所述第三指示信息发送的第四指示信息。
S260，当所述第四指示信息指示所述目标基站的PS信号的强度小于所述强度阈值时，所述MME根据所述第四指示信息向所述网关设备发送所述第二指示信息。
S270，当所述第四指示信息指示所述目标基站的PS信号的强度大于或等于所述强度阈值时，所述MME根据所述第四指示信息向所述目标基站发送所述建立PS语音承载的请求消息。
MME从目标基站所属的跟踪区域获取第一指示信息后，如果该第一指示信息指示目标基站支持PS语音承载，则MME可以向源基站发送第三指示信息，该第三指示信息用于指示源基站查询目标基站的PS信号的强度。
源基站根据第三指示信息进行查询并得到结果后向MME发送第四指示信息，当第四指示信息指示目标基站的PS信号强度大于或等于强度阈值时，MME可以向目标基站发送请求建立PS语音承载的请求消息；当第四指示信 息指示目标基站的PS信号的强度小于该强度阈值时，MME可以确定目标基站无法建立PS语音承载，并向网关设备发送第二指示信息，第二指示信息用于指示PS语音承载创建失败。
因此，本申请实施例提供的建立语音承载的方法，MME在确定目标基站支持PS语音承载后可以请求源基站查询目标基站的PS信号的强度是否满足建立PS语音承载的条件，从而可以减少目标基站的PS信号的强度不满足建立PS语音承载的条件时网络设备为主叫终端设备建立语音承载的时延，并且减少了网络设备的信令开销。
可选地，所述MME从所述源基站获取所述第一指示信息包括：
S280，所述MME向所述源基站发送第五指示信息，所述第五指示信息用于指示所述源基站确定所述目标基站是否支持PS语音承载和/或所述目标基站的PS信号的强度是否大于或等于强度阈值。
S290，所述MME接收所述源基站根据所述第五指示信息发送的所述第一指示信息。
本申请实施例中，MME指示源基站获取目标基站是否PS语音承载和/或所述目标基站的PS信号的强度是否大于或等于强度阈值，例如，MME可以向源基站发送E-RAB Setup请求消息，该E-RAB Setup请求消息中携带上述第五指示信息，从而可以在减小网络设备为主叫终端设备建立语音承载的时延的同时更好的与现有技术衔接，具备更好的技术兼容性。
综上所述，本申请实施例提供的创建语音承载的方法200，MME通过获取用于指示目标基站是否支持PS语音承载和/或所述目标基站的PS信号的强度是否大于或等于强度阈值的指示信息，当目标基站不满足建立PS语音承载的条件时，MME无需等待主叫终端设备完成基站切换即可向核心网设备反馈PS语音承载建立失败，从而减小了主叫终端设备的起呼时延。
图3为本申请实施例提供的另一种创建语音承载的方法的通信示意图，如图3所示，该方法300包括：
S310，源基站获取第一指示信息，所述第一指示信息用于指示目标基站是否支持PS语音承载和/或所述目标基站的PS信号的强度是否大于或等于强度阈值。
S320，所述源基站向MME发送所述第一指示信息，以便于所述MME根据所述第一指示信息确定所述目标基站是否可以创建PS语音承载。
作为一个可选的实施例，源基站可以向主叫终端设备发送测量指示信息，指示主叫终端设备测量目标基站是否支持PS语音承载，或者指示主叫终端设备测量目标基站的PS信号的强度是否满足建立PS语音承载的条件，从而获取第一指示信息，主叫终端设备如何测量目标基站是否支持PS语音承载以及目标基站的PS信号的强度可根据现有技术中的方法确定，在此不再赘述。其中，源基站可以主动查询目标基站是否支持PS语音承载和/或目标基站的PS信号的强度是否大于或等于强度阈值，也可根据MME的指示信息进行上述操作。
源基站获取第一指示信息后将第一指示信息发送给MME，以便于所述MME根据所述第一指示信息确定所述目标基站是否可以创建PS语音承载。
可选地，所述源基站获取第一指示信息包括：
S301，所述源基站从所述MME接收第五指示信息。
S302，所述源基站根据所述第五指示信息从所述主叫终端设备获取所述第一指示信息。
本申请实施例中，源基站根据MME的指示信息确定目标基站是否支持PS语音承载和/或所述目标基站的PS信号的强度是否大于或等于强度阈值(即，根据第五指示信息获取第一指示信息)，从而可以在减小网络设备为主叫终端设备建立语音承载的时延的同时更好的与现有技术衔接，具备更好的兼容性。
因此，本申请实施例提供的创建语音承载的方法300，源基站获取用于指示目标基站是否支持PS语音承载和/或所述目标基站的PS信号的强度是否大于或等于强度阈值的指示信息，并将该指示信息发送给MME，当目标基站不满足建立PS语音承载的条件时，MME无需等待主叫终端设备完成基站切换即可向核心网设备反馈PS语音承载建立失败，从而减小了主叫终端设备的起呼时延。
下面将基于上面所述的本申请实施例涉及的共性方面，对本申请实施例进一步详细说明。
图4是本申请实施例提供的再一种创建语音承载的方法的通信示意图，如图4所示，该方法400包括：
S401，主叫UE(即，主叫终端设备)发起到被叫终端设备的VoLTE业务建立过程。
S402，AF向PCRF(Policy and Charging Rules Function，策略和计费规则功能)实体发送认证授权请求消息(Authorize/Authenticate Request)。
S403，PCRF实体向PGW(Packet Data Network Gateway，分组数据网关)发送重新认证请求消息(Re-Auth-Request)，其中，该重新认证请求消息包括QCI(QoS Class Identifier，服务质量等级标识，其中，“QoS”是“Quality of Service”的简称)。
S404，PGW向PCRF实体发送重新认证应答消息(Re-Auth-Answer)。
S405，PCRF实体向AF发送认证授权应答消息(Authorize/Authenticate Answer)。
S406，PGW向SGW发送QCI＝1的创建承载请求消息(Create Bearer Request)，SGW将QCI＝1的创建承载请求消息转发给MME。
S407，若MME在收到来自SGW的Create Bearer Request时，确定Source eNB(源基站)正在进行切换，并且经查询Target eNB(目标基站)所在TA(Tracking Area，跟踪区域)不支持VoLTE，则此时MME应该向SGW发送创建承载回应消息(Create Bearer Response)，该消息包含指示信息指示创建承载请求失败(Failure)，该消息还可以包括创建承载失败的原因(Cause)。
S408，AF向PCRF实体发送Authorize/Authenticate Request。
S409，PCRF实体向PGW发送Re-Auth-Request。
S410，PGW发现主叫UE的VoLTE专有承载创建失败，PGW向PCRF发送Re-Auth-Answer，该消息包含指示消息，指示网络侧承载创建失败。
S411，PCRF向AF发送Authorize/Authenticate Answer，该消息包含指示消息，指示网络侧承载创建失败。
S412，AF向主叫UE发送SIP 500消息，指示QCI＝1的VoLTE专有承载创建失败。
S413，主叫UE触发CSFB，向目的eNB发送扩展业务请求消息(Extended Service Request)，主叫UE开始尝试在CS域建立语音呼叫。
本申请实施例提供的创建语音承载的方法400，MME收到创建VoLTE承载的请求消息后，通过查询目标基站是否支持VoLTE，从而可以减少目标基站无法建立VoLTE专有承载时网络设备为主叫终端设备建立语音承载的时延，并且减少了网络设备的信令开销。
图5是本申请实施例提供的再一种创建语音承载的方法的通信示意图， 如图5所示，该方法500包括：
S501，主叫UE发起到被叫UE的VoLTE业务建立过程。
S502，AF向PCRF实体发送Authorize/Authenticate Request。
S503，PCRF实体向PGW发送Re-Auth-Request，其中，该Re-Auth-Request包括QCI。
S504，PGW向PCRF实体发送Re-Auth-Answer。
S505，PCRF实体向AF发送Authorize/Authenticate Answer。
S506，PGW向SGW发送QCI＝1的Create Bearer Request，SGW将QCI＝1的创建承载请求消息转发给MME。
S507，若MME在收到来自SGW的Create Bearer Request时，确定Source eNB正在进行切换，则此时MME在向Source eNB发送的E-RAB Setup Request中加上指示信息(Indicator)，指示Source eNB确定目标基站是满足创建VoLTE专有承载的条件。
S508，Source eNB根据该指示信息向主叫终端设备发送测量指示信息，指示主叫终端设备测量目标基站是否支持VoLTE专有承载，或者指示主叫终端设备测量目标基站的VoLTE信号的强度是否满足建立VoLTE承载的条件，当Source eNB确定目标基站不能建立VoLTE专有承载时，向MME发送E-RAN Setup回应消息(E-RAN Setup Response)，该消息携带创建主叫UE的VoLTE专有承载失败的指示信息(Failure)，该消息还可以包括创建承载失败的原因(Cause)。
S509，MME向SGW发送Create Bearer Response，包含指示信息指示VoLTE专有承载创建失败，SGW将承载创建失败的Create Bearer Response告知PGW。
S510，AF向PCRF实体发送Authorize/Authenticate Request。
S511，PCRF实体向PGW发送Re-Auth-Request。
S512，PGW发现主叫UE的VoLTE专有承载创建失败，PGW向PCRF发送Re-Auth-Answer，该消息包含指示消息，指示网络侧承载创建失败。
S513，PCRF向AF发送Authorize/Authenticate Answer，该消息包含指示消息，指示网络侧承载创建失败。
S514，AF向主叫UE发送SIP 500消息，指示QCI＝1的VoLTE专有承载创建失败。
S515，主叫UE触发CSFB，向目的eNB发送Extended Service Request，主叫UE开始尝试在CS域建立语音呼叫。
本申请实施例提供的创建语音承载的方法500，MME收到创建VoLTE承载的请求消息后，通过查询目标基站是否支持VoLTE，从而可以减少目标基站无法建立VoLTE专有承载时网络设备为主叫终端设备建立语音承载的时延，并且减少了网络设备的信令开销，并且，在减小网络设备为主叫终端设备建立语音承载的时延的同时更好的与现有技术衔接，具备更好的兼容性。
图6是本申请实施例提供的再一种创建语音承载的方法的通信示意图，如图6所示，该方法600包括：
S601，主叫UE发起到被叫UE的VoLTE业务建立过程。
S602，AF向PCRF实体发送Authorize/Authenticate Request。
S603，PCRF实体向PGW发送Re-Auth-Request，其中，该Re-Auth-Request包括QCI。
S604，PGW向PCRF实体发送Re-Auth-Answer。
S605，PCRF实体向AF发送Authorize/Authenticate Answer。
S606，PGW向SGW发送QCI＝1的Create Bearer Request，SGW将QCI＝1的创建承载请求消息转发给MME。
S607，MME向Source eNB发送E-RAB Setup Request。
S608，Source eNB接收来自MME的E-RAB Setup Request后发现自身正在执行切换，但是经查询发现，Target eNB不支持VoLTE或者Target eNB所在小区VoLTE信号弱覆盖，于是Source eNB直接拒绝E-RAB Setup Request消息，在向MME发送的E-RAN Setup Response中加入创建主叫UE的VoLTE专有承载失败的指示信息(Failure)，该消息还可以包括创建承载失败的原因(Cause)。
S609，MME向SGW发送Create Bearer Response，包含指示信息指示VoLTE专有承载创建失败，SGW将承载创建失败的Create Bearer Response告知PGW。
S610，AF向PCRF实体发送Authorize/Authenticate Request。
S611，PCRF实体向PGW发送Re-Auth-Request。
S612，PGW发现主叫UE的VoLTE专有承载创建失败，PGW向PCRF 发送Re-Auth-Answer，该消息包含指示消息，指示网络侧承载创建失败。
S613，PCRF向AF发送Authorize/Authenticate Answer，该消息包含指示消息，指示网络侧承载创建失败。
S614，AF向主叫UE发送SIP 500消息，指示QCI＝1的VoLTE专有承载创建失败。
S615，主叫UE触发CSFB，向目的eNB发送Extended Service Request，主叫UE开始尝试在CS域建立语音呼叫。
本申请实施例提供的创建语音承载的方法600，源基站接收来自MME的E-RAB Setup Request后主动查询目标基站是否支持VoLTE或者目标基站所在小区的VoLTE信号的强度，从而可以减少目标基站无法建立VoLTE专有承载时网络设备为主叫终端设备建立语音承载的时延，并且减少了网络设备的信令开销，并且，在减小网络设备为主叫终端设备建立语音承载的时延的同时更好的与现有技术衔接，具备更好的兼容性。
上面主要从各个网元之间交互的角度对本申请实施例的方案进行了介绍。可以理解的是，各个网元，例如MME、源基站等为了实现上述功能，其包含了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，本申请能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
本申请实施例可以根据上述方法示例对MME、源基站等进行功能单元的划分，例如，可以对应各个功能划分各个功能单元，也可以将两个或两个以上的功能集成在一个处理单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。需要说明的是，本申请实施例中对单元的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。
在采用集成的单元的情况下，图7A示出了上述实施例中所涉及的MME的一种可能的结构示意图。MME700包括：处理单元702和通信单元703。处理单元702用于对MME700的动作进行控制管理，例如，处理单元702用于通过通信单元703支持MME700执行图2的S210、S230和S230，处 理单元702还可以用于通过通信单元703支持MME700执行图4的S407，和/或用于本文所描述的技术的其它过程。通信单元703用于支持MME700与其它网络实体的通信，例如与图4中示出的SGW之间的通信。MME700还可以包括存储单元701，用于存储MME700的程序代码和数据。
其中，处理单元702可以是处理器或控制器，例如可以是中央处理器(Central Processing Unit，CPU)，通用处理器，数字信号处理器(Digital Signal Processor，DSP)，专用集成电路(Application-Specific Integrated Circuit，ASIC)，现场可编程门阵列(Field Programmable Gate Array，FPGA)或者其他可编程逻辑器件、晶体管逻辑器件、硬件部件或者其任意组合。其可以实现或执行结合本申请公开内容所描述的各种示例性的逻辑方框，模块和电路。所述处理器也可以是实现计算功能的组合，例如包含一个或多个微处理器组合，DSP和微处理器的组合等等。通信单元703可以是通信接口、收发器、收发电路等，其中，通信接口是统称，可以包括一个或多个接口。存储单元701可以是存储器。
当处理单元702为处理器，通信单元703为通信接口，存储单元701为存储器时，本申请实施例所涉及的MME可以为图7B所示的MME。
参阅图7B所示，该MME710包括：处理器712、通信接口713、存储器711。其中，通信接口713、处理器712以及存储器711可以通过内部连接通路相互通信，传递控制和/或数据信号。
所属领域的技术人员可以清楚地了解到，为了描述的方便和简洁，上述描述的装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
因此，本申请实施例提供的MME，通过获取用于指示目标基站是否支持PS语音承载和/或所述目标基站的PS信号的强度是否大于或等于强度阈值的指示信息，当目标基站不满足建立PS语音承载的条件时，MME无需等待主叫终端设备完成基站切换即可向核心网设备反馈PS语音承载建立失败，从而减小了主叫终端设备的起呼时延。
在采用集成的单元的情况下，图8A示出了上述实施例中所涉及的源基站的一种可能的结构示意图。源基站800包括：处理单元802和通信单元803。处理单元802用于对源基站800的动作进行控制管理，例如，处理单元802用于通过通信单元803支持源基站800执行图3的S310和S320，处理单元 802还可以用于通过通信单元803支持源基站800执行图5的S508，和/或用于本文所描述的技术的其它过程。通信单元803用于支持源基站800与其它网络实体的通信，例如与图5中示出的主叫UE之间的通信。源基站800还可以包括存储单元801，用于存储源基站800的程序代码和数据。
其中，处理单元802可以是处理器或控制器，例如可以是CPU，通用处理器，DSP，ASIC，FPGA或者其他可编程逻辑器件、晶体管逻辑器件、硬件部件或者其任意组合。其可以实现或执行结合本申请公开内容所描述的各种示例性的逻辑方框，模块和电路。所述处理器也可以是实现计算功能的组合，例如包含一个或多个微处理器组合，DSP和微处理器的组合等等。通信单元803可以是通信接口、收发器、收发电路等，其中，通信接口是统称，可以包括一个或多个接口。存储单元801可以是存储器。
当处理单元802为处理器，通信单元803为通信接口，存储单元801为存储器时，本申请实施例所涉及的源基站可以为图8B所示的源基站。
参阅图8B所示，该源基站810包括：处理器812、通信接口813、存储器811。其中，通信接口813、处理器812以及存储器811可以通过内部连接通路相互通信，传递控制和/或数据信号。
所属领域的技术人员可以清楚地了解到，为了描述的方便和简洁，上述描述的装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
因此，本申请实施例提供的源基站，通过获取用于指示目标基站是否支持PS语音承载和/或所述目标基站的PS信号的强度是否大于或等于强度阈值的指示信息，并将该指示信息发送给MME，当目标基站不满足建立PS语音承载的条件时，MME无需等待主叫终端设备完成基站切换即可向核心网设备反馈PS语音承载建立失败，从而减小了主叫终端设备的起呼时延。
在本申请实施例中，各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
另外，本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
结合本申请实施例公开内容所描述的方法或者算法的步骤可以硬件的方式来实现，也可以是由处理器执行软件指令的方式来实现。软件指令可以由相应的软件模块组成，软件模块可以被存放于随机存取存储器(Random Access Memory，RAM)、闪存、只读存储器(Read Only Memory，ROM)、可擦除可编程只读存储器(Erasable Programmable ROM，EPROM)、电可擦可编程只读存储器(Electrically EPROM，EEPROM)、寄存器、硬盘、移动硬盘、只读光盘(CD-ROM)或者本领域熟知的任何其它形式的存储介质中。一种示例性的存储介质耦合至处理器，从而使处理器能够从该存储介质读取信息，且可向该存储介质写入信息。当然，存储介质也可以是处理器的组成部分。处理器和存储介质可以位于ASIC中。另外，该ASIC可以位于MME或源基站中。当然，处理器和存储介质也可以作为分立组件存在于MME或源基站中。
本领域技术人员应该可以意识到，在上述一个或多个示例中，本申请所描述的功能可以用硬件、软件、固件或它们的任意组合来实现。当使用软件实现时，可以将这些功能存储在计算机可读介质中或者作为计算机可读介质上的一个或多个指令或代码进行传输。计算机可读介质包括计算机存储介质和通信介质，其中通信介质包括便于从一个地方向另一个地方传送计算机程序的任何介质。存储介质可以是通用或专用计算机能够存取的任何可用介质。
以上所述的具体实施方式，对本申请的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上所述仅为本申请的具体实施方式而已，并不用于限定本申请的保护范围，凡在本申请的技术方案的基础之上，所做的任何修改、等同替换、改进等，均应包括在本申请的保护范围之内。

Claims (10)

  1. 一种创建语音承载的方法，其特征在于，应用于包括主叫终端设备、被叫终端设备、源基站和目标基站的通信系统中，所述源基站为所述主叫终端设备当前所在小区的基站，所述目标基站为所述主叫终端设备将要切换到的小区的基站，所述方法包括：
    移动性管理实体MME从所述目标基站所属的跟踪区域或者所述源基站获取第一指示信息，所述第一指示信息用于指示所述目标基站是否支持分组交换PS语音承载，或所述第一指示信息用于指示所述目标基站的PS信号的强度是否大于或等于强度阈值；
    所述MME在根据所述第一指示信息确定所述目标基站不支持PS语音承载，或者所述目标基站的PS信号的强度小于所述强度阈值时，向网关设备发送第二指示信息，所述第二指示信息用于指示PS语音承载创建失败；或者，
    所述MME在根据所述第一指示信息确定所述目标基站支持PS语音承载且所述目标基站的PS信号的强度大于或等于所述强度阈值时，向所述目标基站发送建立PS语音承载的请求消息。
  2. 根据权利要求1所述的方法，其特征在于，当所述第一指示信息指示所述目标基站支持PS语音承载时，所述方法还包括：
    所述MME向所述源基站发送第三指示信息，所述第三指示信息用于指示所述源基站查询所述目标基站的PS信号的强度；
    所述MME接收所述源基站根据所述第三指示信息发送的第四指示信息；
    当所述第四指示信息指示所述目标基站的PS信号的强度小于所述强度阈值时，所述MME根据所述第四指示信息向所述网关设备发送所述第二指示信息；
    当所述第四指示信息指示所述目标基站的PS信号的强度大于或等于所述强度阈值时，所述MME根据所述第四指示信息向所述目标基站发送所述建立PS语音承载的请求消息。
  3. 根据权利要求1所述的方法，其特征在于，所述MME从所述源基站获取所述第一指示信息，包括：
    所述MME向所述源基站发送第五指示信息，所述第五指示信息用于指示所述源基站确定所述目标基站是否支持PS语音承载，或所述第五指示信息用于指示所述源基站确定所述目标基站的PS信号的强度是否大于或等于强度阈值；
    所述MME接收所述源基站根据所述第五指示信息发送的所述第一指示信息。
  4. 一种创建语音承载的方法，其特征在于，应用于包括主叫终端设备、被叫终端设备、源基站和目标基站的通信系统中，所述源基站为所述主叫终端设备当前所在小区的基站，所述目标基站为所述主叫终端设备将要切换到的小区的基站，所述方法包括：
    所述源基站获取第一指示信息，所述第一指示信息用于指示所述目标基站是否支持分组交换PS语音承载，或所述第一指示信息用于指示所述目标基站的PS信号的强度是否大于或等于强度阈值；
    所述源基站向移动性管理实体MME发送所述第一指示信息，以便于所述MME根据所述第一指示信息确定所述目标基站是否可以创建PS语音承载。
  5. 根据权利要求4所述的方法，其特征在于，所述源基站获取第一指示信息包括：
    所述源基站从所述MME接收第五指示信息；
    所述源基站根据所述第五指示信息从所述主叫终端设备获取所述第一指示信息。
  6. 一种创建语音承载的装置，其特征在于，应用于包括主叫终端设备、被叫终端设备、源基站和目标基站的通信系统中，所述源基站为所述主叫终端设备当前所在小区的基站，所述目标基站为所述主叫终端设备将要切换到的小区的基站，所述装置包括处理单元和通信单元，
    所述处理单元用于通过所述通信单元从所述目标基站所属的跟踪区域或者所述源基站获取第一指示信息，所述第一指示信息用于指示所述目标基站是否支持分组交换PS语音承载、或所述第一指示信息用于指示所述目标基站的PS信号的强度是否大于或等于强度阈值；
    以及用于在根据所述第一指示信息确定所述目标基站不支持PS语音承载，或者所述目标基站的PS信号的强度小于所述强度阈值时，通过所述通 信单元向网关设备发送第二指示信息，所述第二指示信息用于指示PS语音承载创建失败；或者，在根据所述第一指示信息确定所述目标基站支持PS语音承载且所述目标基站的PS信号的强度大于或等于所述强度阈值时，通过所述通信单元向所述目标基站发送建立PS语音承载的请求消息。
  7. 根据权利要求6所述的装置，其特征在于，当所述第一指示信息指示所述目标基站支持PS语音承载时，所述通信单元还用于：
    向所述源基站发送第三指示信息，所述第三指示信息用于指示所述源基站查询所述目标基站的PS信号的强度；
    接收所述源基站根据所述第三指示信息发送的第四指示信息；
    当所述第四指示信息指示所述目标基站的PS信号的强度小于所述强度阈值时，根据所述第四指示信息向所述网关设备发送所述第二指示信息；
    当所述第四指示信息指示所述目标基站的PS信号的强度大于或等于所述强度阈值时，根据所述第四指示信息向所述目标基站发送所述建立PS语音承载的请求消息。
  8. 根据权利要求6所述的装置，其特征在于，所述通信单元具体用于：
    向所述源基站发送第五指示信息，所述第五指示信息用于指示所述源基站确定所述目标基站是否支持PS语音承载，或所述第五指示信息用于指示所述源基站确定所述目标基站的PS信号的强度是否大于或等于强度阈值；
    接收所述源基站根据所述第五指示信息发送的所述第一指示信息。
  9. 一种创建语音承载的装置，其特征在于，应用于包括主叫终端设备、被叫终端设备、源基站和目标基站的通信系统中，所述源基站为所述主叫终端设备当前所在小区的基站，所述目标基站为所述主叫终端设备将要切换到的小区的基站，所述装置包括处理单元和通信单元，
    所述处理单元用于通过所述通信单元获取第一指示信息，所述第一指示信息用于指示所述目标基站是否支持分组交换PS语音承载，或述第一指示信息用于指示所述目标基站的PS信号的强度是否大于或等于强度阈值；
    以及用于通过所述通信单元向移动性管理实体MME发送所述第一指示信息，以便于所述MME根据所述第一指示信息确定所述目标基站是否可以创建PS语音承载。
  10. 根据权利要求9所述的装置，其特征在于，所述通信单元具体用于：
    从所述MME接收第五指示信息；以及根据所述第五指示信息从所述主 叫终端设备获取所述第一指示信息。
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