CN107548110B

CN107548110B - Decision-making long-term evolution voice final calling domain selection method and system

Info

Publication number: CN107548110B
Application number: CN201610493352.4A
Authority: CN
Inventors: 仝黎
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2016-06-29
Filing date: 2016-06-29
Publication date: 2021-11-19
Anticipated expiration: 2036-06-29
Also published as: CN107548110A

Abstract

The invention provides a method and a system for selecting a decision-making long-term evolution voice call domain, belonging to the technical field of communication, wherein the method comprises the following steps: after receiving the LIR message, the HSS detects that the terminal is registered in the CS network, and sends an LIA message carrying a suppression T-ADS parameter to the I-CSCF _ B; after receiving the terminal INVITE message, the S-CSCF _ B sends the terminal INVITE message carrying the suppression T-ADS parameter to the VoLTE AS _ B according to the IFC data of the called terminal; after receiving the INVITE message, the VoLTE AS _ B detects the suppression T-ADS parameter and sends a UDR message to the HSS to acquire the CSRN number. The invention solves the problem of call establishment failure caused by signal coverage or user roaming in the VoLTE call establishment process, and ensures smooth communication.

Description

Decision-making long-term evolution voice final calling domain selection method and system

Technical Field

The invention relates to the technical field of communication, in particular to a method and a system for selecting a decision-making long-term evolution voice terminal calling domain.

Background

The IP Multimedia Subsystem (IMS) is the developing direction of future Multimedia communication and is the most important component of next generation networks. It is a subsystem supporting IP multimedia services proposed by the Third Generation Partnership Project (3 GPP).

VoLTE over IP Multimedia Subsystem (IMS) is a major development direction recognized by the 3GPP for voice over LTE solutions.

Due to insufficient coverage at the initial stage of LTE network deployment, in order to ensure Continuity of Voice service, a Single Radio Voice Call Continuity (SRVCC) technology needs to be used, and the wide coverage of the existing mobile Circuit Switched (CS) network is utilized to switch Voice service from the LTE network to the mobile CS network, so as to maintain Continuity of Voice service.

SRVCC addresses the implementation of voice service handover to CS after a call has been established. However, in the call setup process of VoLTE, if the user re-registers to the CS due to signal coverage or user roaming, the current existing technical solution may cause the user to fail to continue, which affects the user experience.

Disclosure of Invention

The technical problem to be solved by the embodiments of the present invention is to provide a method, an apparatus and a system for selecting a decision-making long term evolution voice (VoLTE) call domain, so as to solve the problem of call setup failure caused by signal coverage or user roaming in the VoLTE call setup process.

The invention solves the technical problems through the following technical scheme:

the invention provides a method for selecting a decision-making long-term evolution voice final calling domain on one hand, which comprises the following steps:

after receiving the Location Information Request (LIR), the Home Subscriber Server (HSS) detects that the terminal is registered in a mobile Circuit Switching (CS) network, and sends a location information response (LIA) carrying a suppression access domain selection (T-ADS) parameter to an inquiry call session control function (I-CSCF _ B);

after receiving the terminal INVITE, the service session control function (S-CSCF _ B) sends a terminal INVITE message carrying a suppression T-ADS parameter to the VoLTE AS _ B according to the Initial Filter Criteria (IFC) data of the called terminal;

after receiving the INVITE message, the decision-making long-term evolution voice server VoLTE AS _ B detects the suppression T-ADS parameter and sends a User Data Record (UDR) message to the HSS to acquire a CS domain roaming number (CSRN).

Further, the method further comprises:

after receiving the INVITE message, the VoLTE AS _ B does not detect the suppression T-ADS parameter, and sends a UDR message to the HSS to acquire T-ADS information;

the terminal roams in the LTE network and is registered in a second mobility management entity (MME2) again;

the HSS detects that the current terminal is registered in MME2, and returns a user data response (UDA) carrying a Roaming Retry parameter to VoLTE AS _ B;

receiving the UDA message by VoLTE AS _ B, not detecting T-ADS information, detecting a Roaming Retry parameter, sending the UDR message to HSS to reacquire the T-ADS information;

MME _ B sends T-ADS information of the called terminal to HSS through an insert data response (IDA) message.

Further, the method further comprises:

after receiving the INVITE message, the VoLTE AS _ B does not search the suppression T-ADS parameter, judges that the corresponding domain is selected to the CS network, and sends a UDR message to the HSS to acquire the CSRN;

the terminal roams in the CS network and re-registers to a second mobile switching center Server (MSC Server 2);

the HSS detects that the current terminal is registered in the MSC Server2, and returns a UDA message carrying a Roaming Retry parameter to the VoLTE AS _ B;

receiving the UDA message by VoLTE AS _ B, detecting a Roaming Retry parameter if the CSRN is not detected, and sending the UDR message to the HSS to reacquire the CSRN;

the HSS obtains a Mobile Station Roaming Number (MSRN) of the called terminal from the MSC Server2, and returns the MSRN to VoLTE AS _ B in the UDA message.

Further, the method further comprises:

after receiving the INVITE message, the VoLTE AS _ B does not search the suppression T-ADS parameter, judges that the corresponding domain is selected to the CS domain, and sends a UDR message to the HSS to acquire the CSRN;

the HSS sends a message to the MSC Server1 to obtain the MSRN of the called terminal,

the first mobile switching center Server (MSC Server1) returns a Roaming Retry parameter carrying an error reason to the HSS;

the HSS returns a UDA message carrying error reason Roaming Retry parameters to the VoLTE AS _ B;

receiving the UDA message by VoLTE AS _ B, not detecting the CSRN, detecting a Roaming Retry parameter carrying an error reason, and sending the UDR message to HSS to reacquire the CSRN;

the HSS obtains the MSRN of the called terminal from the MSC Server2, and returns the CSRN to VoLTE AS _ B in the UDA message.

One aspect of the present invention further provides a system for deciding a long term evolution voice final call domain, comprising:

a Home Subscriber Server (HSS) for detecting that the terminal has been registered in the CS network after receiving the LIR and sending an LIA carrying a suppression T-ADS parameter to the I-CSCF _ B;

a service session control function (S-CSCF _ B) used for sending a terminal INVITE message carrying a suppression T-ADS parameter to a VoLTE AS _ B according to IFC data of a called terminal after receiving the terminal INVITE;

and the decision-making long term evolution voice server (VoLTE AS _ B) is used for detecting the suppression T-ADS parameter after receiving the INVITE message and sending a UDR message to the HSS to acquire the CSRN.

Further, the system further comprises a mobility management entity (MME _ B);

the VoLTE AS _ B is also used for sending a UDR message to the HSS to acquire T-ADS information when the suppression T-ADS parameter is not detected after the INVITE message is received;

the HSS is further configured to detect that the current terminal is registered in the MME2, and return an UDA message carrying a Roaming Retry parameter to the VoLTE AS _ B;

the VoLTE AS _ B is also used for receiving the UDA message, detecting the T-ADS information, detecting the Roaming Retry parameter and sending the UDR message to the HSS to reacquire the T-ADS information;

and the MME _ B is used for sending T-ADS information of the called terminal to the HSS through the IDA message.

Further, in the above-mentioned case,

the VoLTE AS _ B is also used for receiving the INVITE message, searching the suppression T-ADS parameter, judging that the corresponding domain is selected to the CS network, and sending a UDR message to the HSS to acquire the CSRN;

the HSS is further used for detecting that the current terminal is registered in the MSC Server2, and returning a UDA message carrying a Roaming Retry parameter to the VoLTE AS _ B;

the VoLTE AS _ B is also used for receiving the UDA message, detecting the CSRN when the CSRN is not detected, detecting a Roaming Retry parameter, and sending the UDR message to the HSS to reacquire the CSRN;

the HSS is further configured to acquire the MSRN of the called terminal from the MSC Server2, and return the CSRN to the VoLTE AS _ B in the UDA message.

Further, the system further comprises a first mobile switching center Server (MSC Server1) and a second mobile switching center Server (MSC Server 2);

the VoLTE AS _ B is also used for receiving the INVITE message, searching the suppression T-ADS parameter, judging that the CS domain is selected by the corresponding domain, and sending a UDR message to the HSS to acquire the CSRN;

the HSS is also used for sending a message to the MSC Server1 to acquire the MSRN of the called terminal,

the MSC Server1 is used for returning a Roaming Retry parameter carrying an error reason to the HSS;

the HSS is further used for returning a UDA message carrying an error reason Roaming Retry parameter to the VoLTE AS _ B;

the VoLTE AS _ B is also used for receiving the UDA message, detecting the CSRN when the CSRN is not detected, detecting a Roaming Retry parameter carrying an error reason, and sending the UDR message to the HSS to reacquire the CSRN;

Compared with the prior art, the method and the system for deciding the long term evolution voice terminal call domain selection introduce a roaming retry mechanism in the terminal call domain selection process, increase the parameters for inhibiting T-ADS by expanding the UDR response message UDA, and are used for indicating the VoLTE AS to reinitiate and acquire the CSRN. Therefore, the problem of call setup failure caused by signal coverage or user roaming in the VoLTE call setup process is solved.

Drawings

Fig. 1 shows a flowchart of a VoLTE terminating domain selection method according to an embodiment of the present invention;

fig. 2 shows a flowchart of a VoLTE terminating domain selection method according to a second embodiment of the present invention;

fig. 3 shows a flowchart of a VoLTE terminating domain selection method provided by the third embodiment of the present invention;

fig. 4 shows a flowchart of a VoLTE terminating domain selection method according to a fourth embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any inventive step, are within the scope of the present invention.

The invention provides a method and a system for selecting a decision-making long-term evolution voice final call domain, which are referred to as a VoLTE final call domain selection method and a VoLTE final call domain selection system in the following description.

Example one

An embodiment of the present invention provides a method for selecting a VoLTE terminating domain, as shown in fig. 1, the method includes:

s101, UE _ A sends an INVITE message to I-CSCF _ B;

and after receiving the INVITE message, the S102 and the I-CSCF _ B send LIR messages to the HSS to acquire the S-CSCF _ B address registered by the UE _ B.

In this embodiment, the HSS is a converged HLR/HSS, which can detect whether a user is registered in the CS network.

After the S103 and the HSS receive the LIR message, because the UE _ B registers the S-CSCF address in the HSS during registration, the HSS sends the LIA message carrying the server address of the S-CSCF _ B to the I-CSCF _ B. Meanwhile, the fused HLR/HSS detects that the user is registered in the CS network, and the LIA message carries the suppression T-ADS parameter.

When the suppression T-ADS parameter is a first value (such as 0), the suppression T-ADS parameter is not suppressed; and when the suppression T-ADS parameter is a second value (such as 1), the suppression is represented.

And after receiving the INVITE message, the S104 and the S-CSCF _ B trigger the VoLTE AS _ B according to the IFC data of the called terminal and simultaneously carry the suppression T-ADS parameter.

S105, after receiving the INVITE message, the VoLTE AS _ B detects the suppression T-ADS parameter, sends an Sh interface UDR message to the HSS and requires to acquire the CSRN.

S106, the fused HLR/HSS sends MAP _ PROVIDE _ ROAMING _ NUMBER message to the G/V MSC Server to request to acquire the ROAMING NUMBER MSRN of the called terminal.

S107, the G/V MSC Server returns a MAP _ PROVIDE _ ROAMING _ NUMBER _ ACK message to the converged HLR/HSS, and the MAP _ PROVIDE _ ROAMING _ NUMBER _ ACK message carries the MSRN.

S108, HSS returns CSRN to VoLTE AS _ B in UDA message.

S109, VoLTE AS _ B fills the obtained CSRN number in the Req-uri message of the INVITE, and sends S-CSCF _ B.

S110, S-CSCF _ B determines the route of MGCF according to CSRN number, and sends INVITE message to MGCF.

S111, MGCF analyzes CSRN number, obtains out route, and routes call request to MSC Server where UE _ B is currently located through IAM message.

S112-114, UE _ B answers, and the call is successfully established.

The embodiment of the invention expands a T-ADS inhibiting parameter in the LIA message and returns the T-ADS inhibiting parameter to the I/S-CSCF in the LIA. The I/S-CSCF brings the parameter to the VoLTE AS in the INVITE request, and when the VoLTE AS establishes a call, if the parameter is detected, the T-ADS domain selection process is skipped, and the CSRN is directly acquired from the HSS, so that the VoLTE call process is simplified.

Example two

An embodiment of the present invention provides a VoLTE call domain selection method, as shown in fig. 2, the method includes:

s201, UE _ A sends an INVITE message to I-CSCF _ B;

and after receiving the INVITE message, the S202 and the I-CSCF _ B send LIR messages to the HSS to acquire the S-CSCF _ B address registered by the UE _ B.

After S203 and HSS receive the LIR message, because UE _ B registers the S-CSCF address in HSS during registration, HSS sends the LIA message carrying the server address of S-CSCF _ B to I-CSCF _ B.

And S204, after receiving the INVITE message, the S-CSCF _ B triggers the VoLTE AS _ B according to the IFC data of the called user.

S205, VoLTE AS _ B sends Sh interface UDR information to HSS to request to obtain T-ADS information.

S206-211, the UE roams in the LTE network and re-registers in the MME 2.

S212 and HSS are integrated with SAE-HSS function, and can detect that the current user is registering in a new MME2, and return a UDA message carrying Roaming Retry parameter to VoLTE AS _ B.

And S213, receiving the UDA message by the VoLTE AS _ B, detecting that the current time does not carry the T-ADS parameter but carries the Roaming Retry parameter, and sending an Sh interface UDR message to the HSS again to request to obtain the T-ADS information again.

S214, MME _ B sends T-ADS information of the called user to HSS through IDA message, HSS detects that LTE registration of the user is completed, and T-ADS information of the called user is inquired from MME _2 through IDR message.

S215, MME _ B sends T-ADS information of the called user to HSS through IDA message.

S216, HSS returns T-ADS information to VoLTE AS _ B through UDA message.

And S217, the VoLTE AS judges that the corresponding domain selects the IMS domain according to the obtained T-ADS information, and sends an INVITE message to the S-CSCF _ B, wherein the Request-URI is the URI number of the called user in the IMS domain.

S218, S-CSCF _ B judges that the IFC of the current called terminal is triggered to be completed, the P-CSCF _ B address registered by the terminal is inquired, the INVITE message is sent to the P-CSCF _ B, and the P-CSCF _ B sends the INVITE message to the UE _ B.

S219-S220, UE _ B answers, call setup is successful.

According to the embodiment of the invention, when the Roaming of the user in the LTE network is detected, the Roaming Retry parameter is added, the UDA message carrying the Roaming Retry parameter is returned to the VoLTE AS _ B, and the VoLTE AS _ B is instructed to reinitiate and acquire the CSRN. And the T-ADS roaming retry process is realized, so that the problem of call establishment failure caused by signal coverage or user roaming in the VoLTE call establishment process is solved.

EXAMPLE III

An embodiment of the present invention provides a VoLTE call domain selection method, as shown in fig. 3, the method includes:

s301, UE _ A sends an INVITE message to I-CSCF _ B;

and S302, after receiving the INVITE message, the I-CSCF _ B sends an LIR message to the HSS to acquire the S-CSCF _ B address registered by the UE _ B.

After S303 and HSS receive LIR message, because UE _ B registers S-CSCF address in HSS when registering, HSS sends LIA message carrying server address of S-CSCF _ B to I-CSCF _ B.

And S304 and S-CSCF _ B trigger VoLTE AS _ B according to the IFC data of the called user after receiving the INVITE message.

S305, the internal logic of the VoLTE AS _ B judges that the corresponding domain is selected to the CS network, sends Sh interface UDR information to the HSS and requires to obtain the CSRN number.

S306-S309, the UE roams in the CS network and re-registers to the MSC Server 2.

S310, HSS integrates HLR function, detects that the current terminal is registered in a new MSC Server2, and directly returns UDA message carrying Roaming Retry parameter to VoLTE AS _ B.

And S311, after receiving the UDA message and not detecting the CSRN number but detecting the Roaming Retry parameter, the VoLTE AS _ B sends an Sh interface UDR message to the HSS again to require to obtain the CSRN number again.

S312, the fused HLR/HSS sends MAP _ PROVIDE _ ROAMING _ NUMBER message to the G/V MSC Server2 to request to obtain the ROAMING NUMBER MSRN of the called terminal.

S313, G/V MSC Server2 returns the MSRN in a MAP _ PROVIDE _ ROAMING _ NUMBER _ ACK message to the converged HLR/HSS.

S314, HSS will return CSRN to VoLTE AS _ B in UDA message.

S315, VoLTE AS _ B fills the obtained CSRN number in the Req-uri message of the INVITE, and sends the message to S-CSCF _ B.

S316, S-CSCF _ B determines the route to MGCF, and sends INVITE message to MGCF.

S317, MGCF analyzes CSRN, obtains out route and routes call request to current G/V MSC Server of UE _ B through IAM message.

S318-S320, UE _ B answer, call setup is successful.

According to the embodiment of the invention, when the Roaming of the user in the CS network is detected, the Roaming Retry parameter is added, the UDA message carrying the Roaming Retry parameter is returned to the VoLTE AS _ B, and the VoLTE AS _ B is instructed to reinitiate and acquire the CSRN. And the T-ADS roaming retry process is realized, so that the problem of call establishment failure caused by signal coverage or user roaming in the VoLTE call establishment process is solved.

Example four

An embodiment of the present invention provides a VoLTE call domain selection method, as shown in fig. 4, the method includes:

s401, UE _ A sends an INVITE message to I-CSCF _ B;

and after receiving the INVITE message, the S402 and the I-CSCF _ B send LIR messages to the HSS to acquire the S-CSCF _ B address registered by the UE _ B.

After S403, HSS receives LIR message, because UE _ B registers S-CSCF address in HSS when registering, HSS sends LIA message to I-CSCF _ B, which carries server address of S-CSCF _ B.

And S404, after receiving the INVITE message, the S-CSCF _ B triggers the VoLTE AS _ B according to the IFC data of the called user.

S405, VoLTE AS _ B sends Sh interface UDR information to HSS to request to obtain T-ADS information.

S406 and HSS integrate SAE-HSS function, and inquire T-ADS information of called user to MME _ B through IDR message.

S407, MME _ B sends T-ADS information of the called user to HSS through IDA message.

S408, the HSS returns the T-ADS information to the VoLTE AS _ B through the UDA message.

And S409, VoLTE AS judges that the CS domain is selected by the domain according to the obtained T-ADS information and internal logic, and sends an Sh interface UDR message to HSS to request to obtain the CSRN number.

S410, the converged HLR/HSS sends a MAP _ PROVIDE _ ROAMING _ NUMBER message to the MSC Server1 to request to acquire the ROAMING NUMBER MSRN of the called user.

S411, because the user roams in the CS domain at this time, MSC Server1 can not page the user, therefore, the MAP ERROR is returned to the converged HSS/HLR, and the ERROR reason is Roaming Retry.

S412, the HSS returns the UDA to the VoLTE AS _ B, and the UDA carries the Roaming Retry parameter.

And S413, receiving the UDA message by VoLTE AS _ B, detecting that the current CSRN is not carried, but the Roaming Retry parameter is carried, sending an Sh interface UDR message to the HSS again, and requiring to obtain the CSRN again.

S414, the integrated HLR/HSS sends MAP _ PROVIDE _ ROAMING _ NUMBER message to the MSC Server2 to request to obtain the called user' S ROAMING NUMBER MSRN.

S415, the MSC Server2 will return the MSRN in a MAP _ PROVIDE _ ROAMING _ NUMBER _ ACK message to the converged HLR/HSS.

S416, HSS will return CSRN to VoLTE AS _ B in UDA message.

And S417 and VoLTE AS _ B fill the obtained CSRN number in the Req-uri message of the INVITE and send the message to S-CSCF _ B.

S418, S-CSCF _ B determines a route to the MGCF, and sends an INVITE message to the MGCF.

S419, MGCF analyzes CSRN, acquires out route and routes call request to current G/V MSC Server of UE _ B through IAM message.

S420-S422, UE _ B answers, call setup is successful.

According to the embodiment of the invention, when the CSRN number acquisition fails, a Roaming Retry parameter is added, a UDA message carrying the Roaming Retry parameter is returned to the VoLTE AS _ B, and the VoLTE AS _ B is instructed to reinitiate the CSRN acquisition. And the T-ADS roaming retry process is realized, so that the problem of call establishment failure caused by signal coverage or user roaming in the VoLTE call establishment process is solved.

EXAMPLE five

An embodiment of the present invention provides a VoLTE terminating domain selection system, including:

Further, the system further comprises a mobility management entity (MME _ B);

Further, in the above-mentioned case,

It will be understood by those within the art that each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the programmable data processing apparatus, create means for implementing the methods specified in the block or blocks of the block diagrams and/or flowchart block or blocks.

It should be noted that: the embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.

The method and the system for deciding the long term evolution voice over long term evolution (VoLTE) terminal call domain selection provided by the invention are introduced in detail, a specific example is applied in the text to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. A method for deciding a long term evolution voice terminating domain selection, comprising:

after receiving a Location Information Request (LIR), a Home Subscriber Server (HSS) detects that a terminal is registered in a mobile Circuit Switching (CS) network, and sends a location information response (LIA) carrying a suppression access domain selection (T-ADS) parameter to an inquiry call session control function (I-CSCF _ B), wherein when the T-ADS parameter is a first value, the suppression is not performed; when the T-ADS parameter is a second value, inhibition is represented;

2. The method of claim 1, further comprising:

the terminal roams in the LTE network and is registered in a second Mobility Management Entity (MME) again;

the HSS detects that the current terminal is registered in the MME, and returns a user data response (UDA) carrying a Roaming Retry parameter to VoLTE AS _ B;

the MME sends T-ADS information of the called terminal to the HSS through an insert data response (IDA) message.

3. The method of claim 1, further comprising:

4. The method of claim 3, further comprising:

5. A system for decision making long term evolution voice terminated call domain selection, comprising:

the Home Subscriber Server (HSS) is used for detecting that the terminal is registered in the CS network after receiving the LIR, and sending the LIA carrying the T-ADS inhibiting parameter to the I-CSCF _ B, wherein when the T-ADS parameter is a first value, the LIA does not inhibit; when the T-ADS parameter is a second value, inhibition is represented;

6. The system of claim 5, wherein the system further comprises a Mobility Management Entity (MME);

the HSS is further used for detecting that the current terminal is registered in the MME and returning a UDA message carrying a Roaming Retry parameter to the VoLTE AS _ B;

and the MME is used for sending T-ADS information of the called terminal to the HSS through the IDA message.

7. The system of claim 5,

8. The system of claim 7, further comprising a first mobile switching center Server (MSC Server1) and a second mobile switching center Server (MSC Server 2);