CN108260170B - A resource reservation control method and MGCF unit - Google Patents

Abstract

The invention discloses a resource reservation control method and an MGCF unit, relates to the technical field of communication, and aims to solve the problem of prolonged calling time when a calling terminal and a called terminal are both positioned between CS domains. The resource reservation control method comprises the following steps: when the called terminal resides in the circuit switching CS domain, the MGCF unit of the media gateway control function of the IMS network receives the invitation message of calling the called terminal; judging whether the invite message contains a session border controller domain sbc-domain parameter; if the invite message is determined not to contain the sbc-domain parameter, then a call negotiation in the form of a non-resource reservation is performed.

Description

A resource reservation control method and MGCF unit

technical field

The present invention relates to the field of communication technologies, and in particular, to a resource reservation control method and an MGCF unit.

Background technique

VOLTE (Voice over Long Term Evolution, LTE voice bearer) is a voice service based on IMS (Internet Protocol Multimedia Subsystem, Internet Protocol Multimedia Subsystem). There are four scenarios for calling between user terminals using the VOLTE service, namely, the calling terminal and the called terminal reside in the IMS network, the calling terminal resides in the IMS network and the called terminal resides in the CS ( Circuit Switched, circuit switched) domain, the calling terminal resides in the CS domain and the called terminal resides in the IMS network, and both the calling terminal and the called terminal reside in the CS domain. However, when the calling terminal calls the called terminal, radio resources need to be allocated, so it may happen that the IMS network does not have the media resources ready. As a result, the calling terminal and the called terminal cannot receive voice information in the first few seconds of the call connection, and the user cannot hear the voice in the calling terminal and the called terminal. In order to avoid the above situation, it is necessary to reserve Precondition resources before the called terminal rings to ensure that the calling terminal and the called terminal prepare media resources before the called terminal rings, so as to ensure that the calling terminal and the called terminal can After connecting, you can receive voice messages immediately.

When both the calling terminal and the called terminal reside in the CS domain, since the call information between the calling terminal and the called terminal is transmitted from the access MGCF (Media Gateway Control Function) unit of the IMS network to the The outgoing MGCF unit of the IMS network. However, the networks between the access MGCF unit and the outgoing MGCF unit of the IMS network are all wired networks, and do not need to allocate radio resources. The precondition resource reservation process between the incoming MGCF unit and the outgoing MGCF unit of the IMS network will cause a delay in the call between the calling terminal and the called terminal, resulting in an excessively long call delay.

SUMMARY OF THE INVENTION

The embodiments of the present invention provide a resource reservation control method and an MGCF unit, which can reduce the delay of calling when both the calling terminal and the called terminal are located between CS domains.

In a first aspect, an embodiment of the present invention provides a resource reservation control method, which includes: when a called terminal resides in a circuit-switched CS domain, the outgoing media gateway control function MGCF unit of the network protocol multimedia subsystem IMS network receives Invite message to call the called terminal; determine whether the invitation message contains the sbc-domain parameter of the session border controller domain; if it is determined that the invitation message does not contain the sbc-domain parameter, perform call negotiation in the form of non-resource reservation.

In some embodiments of the first aspect, the above resource reservation control method further includes: if it is determined that the invitation message contains the sbc-domain parameter, performing call negotiation in the form of resource reservation.

In some embodiments of the first aspect, the step of judging whether the visit message contains the sbc-domain parameter of the session border controller domain includes: judging whether the access network information P-Access-Network-Info header field of the invitation message contains sbc- domain parameter.

In some embodiments of the first aspect, the step of performing the call negotiation in the form of non-resource reservation includes: sending an invite reply message to the access MGCF unit of the network protocol multimedia subsystem IMS network, the request reply message requires that the require header field is not specified. Indicate resource reservation; send the starting address information IAM to the mobile switching center of the called terminal; receive the full address information ACM sent by the mobile switching center of the called terminal.

In some embodiments of the first aspect, the step of sending the invitation reply message to the access MGCF unit of the IMS network includes: sending the invitation reply message to the call session control function CSCF unit or the application server of the called terminal, so that the CSCF unit or The application server forwards the invitation reply message to the access MGCF unit of the IMS network.

In a second aspect, an embodiment of the present invention provides an MGCF unit, which is characterized by comprising: an invitation receiving module configured to receive an invitation message for calling the called terminal when the called terminal resides in a circuit-switched CS domain; The judgment module is configured to judge whether the invitation message contains the sbc-domain parameter of the session border controller domain; the non-resource reservation module is configured to execute the non-resource reservation form if it is judged that the invitation message does not contain the sbc-domain parameter Call negotiation.

In some embodiments of the second aspect, the above-mentioned MGCF unit further includes: a resource reservation module configured to perform call negotiation in the form of resource reservation if it is determined that the invitation message contains the sbc-domain parameter.

In some embodiments of the second aspect, the judging module is specifically configured to judge whether the access network information P-Access-Network-Info header field of the invitation message contains the sbc-domain parameter.

In some embodiments of the second aspect, the non-resource reservation module is specifically configured to: send an invitation reply message to the access MGCF unit of the IMS network, the request header field of the invitation reply message does not indicate resource reservation; The mobile switching center of the terminal sends the starting address information IAM; receives the full address information ACM sent by the mobile switching center of the called terminal.

In some embodiments of the second aspect, the non-resource reservation module is specifically configured to: send an invitation reply message to the call session control function CSCF unit of the called terminal or the application server, so that the CSCF unit or the application server sends the invitation reply message Forwarded to the access MGCF unit of the IMS network.

Embodiments of the present invention provide a resource reservation control method and an MGCF unit. When the called terminal resides in the CS domain, the incoming MGCF unit of the called terminal receives an invitation message, and determines whether the invitation message contains the sbc-domain parameter, If the invitation message does not contain the sbc-domain parameter, it indicates that the invitation message comes from the access MGCF unit of the IMS network, that is to say, the calling terminal also resides in the CS domain. The resource reservation step needs to be performed, thereby eliminating the time spent on performing call negotiation in the form of resource reservation, and reducing the delay in making a call when both the calling terminal and the called terminal are located between the CS domains.

Description of drawings

The present invention can be better understood from the following description of specific embodiments of the present invention in conjunction with the accompanying drawings, wherein the same or similar reference numerals denote the same or similar features.

1 is a schematic diagram of an application scenario of a resource reservation control method in an embodiment of the present invention;

FIG. 2 is a flowchart of a resource reservation control method provided by an embodiment of the present invention;

3 is a flowchart of a resource reservation control method provided by another embodiment of the present invention;

4 is a flowchart of a method for controlling resource reservation in another embodiment of the present invention;

5 is a flowchart of a negotiation call in the prior art where both the calling terminal and the called terminal are in the CS domain and adopt the form of resource reservation;

6 is a flowchart of a negotiation call in which the calling terminal and the called terminal are both in the CS domain and adopt a non-resource reservation form in an embodiment of the present invention;

7 is a schematic structural diagram of an MGCF unit in an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of an MGCF unit 400 in another embodiment of the present invention.

Detailed ways

Features and exemplary embodiments of various aspects of the invention are described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present invention by illustrating examples of the invention. The present invention is in no way limited to any specific configurations and algorithms set forth below, but covers any modification, substitution and improvement of elements, components and algorithms without departing from the spirit of the invention. In the drawings and the following description, well-known structures and techniques have not been shown in order to avoid unnecessarily obscuring the present invention.

The embodiment of the present invention provides a resource reservation control method, which is applied to a call scenario between VOLTE users. 1 is a schematic diagram of an application scenario of a resource reservation control method in an embodiment of the present invention. As shown in FIG. 1, it involves the calling terminal, the called terminal, and the access MGCF unit and the access MGCF unit of the IMS network corresponding to the called terminal. The outgoing MGCF unit may also include a CSCF (Call Session Control Function, call session control function) unit or AS (Application Server, application server) corresponding to the called terminal, which may be represented by CSCF/AS. The message sent by the calling terminal can reach the called terminal only after passing through the access MGCF unit and the access MGCF unit of the IMS network corresponding to the called terminal. Similarly, the message sent by the called terminal to the calling terminal also needs to pass through the access MGCF unit and the outgoing MGCF unit of the IMS network corresponding to the called terminal. The access MGCF unit and the outgoing MGCF unit of the IMS network corresponding to the called terminal are the MGCF units located at the head and the end in the IMS network corresponding to the called terminal. In the IMS network, the network between the incoming MGCF unit and the outgoing MGCF unit is a wired network.

FIG. 2 is a flowchart of a method for controlling resource reservation according to an embodiment of the present invention. As shown in FIG. 2 , the method for controlling resource reservation includes steps 101 to 103 .

In step 101, when the called terminal resides in a circuit switched domain (CS domain for short), the outgoing MGCF unit of the IMS network receives an invitation message for calling the called terminal.

When the called terminal resides in the CS domain, it is necessary to determine whether the calling terminal is in the CS domain by sending an invitation message (ie, an INVITE message) to the called terminal, so as to determine whether execution resources are required according to whether the calling terminal resides in the CS domain Call negotiation in the form of reservation (ie Precondition).

In step 102, it is judged whether the SBC-domain parameter of the session border controller is included in the invitation message.

Wherein, whether the calling terminal resides in the CS domain can be determined by where the invitation message is sent. If the invitation message is sent through the access MGCF unit of the IMS network corresponding to the called terminal, it indicates that the calling terminal resides in the CS domain. If the invitation message is sent through an SBC (Session Border Controller, session border controller) corresponding to the calling terminal, it indicates that the calling terminal resides in the VOLTE domain. Specifically, whether the invitation message is sent through the access MGCF unit of the IMS network corresponding to the called terminal or through the SBC corresponding to the calling terminal can be determined by whether the invitation message contains the sbc-domain parameter.

In step 103, if it is determined that the invitation message does not contain the sbc-domain parameter, call negotiation in the form of non-resource reservation is performed.

If the invitation message does not contain the sbc-domain parameter, it indicates that the invitation message is sent through the access MGCF unit of the IMS network corresponding to the called terminal. Since the access MGCF unit and the outgoing MGCF unit of the IMS network corresponding to the called terminal are wired networks, there is no wireless resource allocation process after the call between the calling terminal and the called terminal is connected. Therefore, performing call negotiation in the form of non-resource reservation (ie, non-precondition) can save the time delay spent in the call negotiation in the form of resource reservation, and reduce the number of calls between the calling terminal and the called terminal both in the CS domain. Call delay. Specifically, the 183 message can be used to perform call negotiation in the form of non-resource reservation.

The embodiment of the present invention provides a resource reservation control method. When the called terminal resides in the CS domain, the MGCF unit of the IMS network receives the invitation message, and judges whether the invitation message contains the sbc-domain parameter. Does not include the sbc-domain parameter, indicating that the invitation information comes from the access MGCF unit of the IMS network, that is to say, the calling terminal also resides in the CS domain, then the call negotiation in the form of non-resource reservation is used, and no resource reservation is required. This saves the time spent in performing call negotiation in the form of resource reservation, and reduces the delay in making a call when both the calling terminal and the called terminal are located between CS domains.

FIG. 3 is a flowchart of a resource reservation control method provided by another embodiment of the present invention. FIG. 3 is different from FIG. 2 in that the flowchart of the resource reservation control method shown in FIG. 3 may further include step 104 .

In step 104, if it is determined that the invitation message contains the sbc-domain parameter, call negotiation in the form of resource reservation is performed.

When it is determined that the invitation message contains the sbc-domain parameter, it indicates that the invitation message comes from the SBC of the calling terminal, which indicates that the calling terminal resides in VOLTE and needs to perform call negotiation in the form of Precondition resource reservation to complete the preparation of media resources. Specifically, the 183 message can be used to perform call negotiation in the form of resource reservation.

Specifically, the process of executing the call negotiation in the form of resource reservation is as follows: the called terminal returns a 183 message to the calling terminal to request Precondition resource reservation; the calling terminal sends a PRACK message (that is, a temporary reply confirmation message) to the called terminal , and perform resource reservation on the calling terminal side; the called terminal returns a 200OK message to the calling terminal after receiving the PRACK message, and performs resource reservation on the called terminal side; The calling terminal sends an UPDATE notification message (that is, an update notification message). After receiving the UPDATE notification message, the called terminal sends a 200 OK message for the UPDATE notification message to the calling terminal, notifying the calling terminal and the called terminal side to complete the resource reservation.

Specifically, in an example of the above embodiment, to determine whether the invitation message contains the sbc-domain parameter, it can be determined whether the P-Access-Network-Info header field (ie the access network information header field) of the INVITE message contains sbc-domain parameter.

FIG. 4 is a flowchart of a method for controlling resource reservation in another embodiment of the present invention. The difference between FIG. 4 and FIG. 3 is that step 103 shown in FIG. 3 can be specifically subdivided into steps 1031-steps in FIG. 4 1033.

In step 1031, if it is determined that the invitation message does not contain the sbc-domain parameter, an invitation reply message is sent to the access MGCF unit of the IMS network.

The request header field of the invitation reply message does not indicate resource reservation, which means that the user agent client (UAC, User Agent Client) of the calling terminal is not required to support resource reservation. In an example, "a=curr", "a=des" and "a=des" are not included in the SDP of the invitation reply message. At this time, the media negotiation between the access MGCF unit and the outgoing MGCF unit of the IMS network is due to There is no necessary form of negotiation into resource reservation, and only a form of non-resource reservation can be negotiated.

In an illustrative example of the embodiment of the present invention, the step of sending an invite reply message to an access MGCF unit of the IMS network may be specifically implemented as sending an invite reply message to the CSCF unit or AS of the called terminal, so that the CSCF unit or the AS can send an invite reply message to the called terminal. The application server forwards the invitation reply message to the access MGCF unit of the IMS network.

In step 1032, the starting address information IAM is sent to the mobile switching center of the called terminal.

Wherein, the call negotiation in the form of non-resource reservation is performed, that is, the call negotiation in the form of resource reservation is no longer performed. An IAM (InitialAddress Message, initial address information) message can be sent directly to the MSC (Mobile Switching Center, mobile switching center) of the called terminal, and it is no longer necessary to wait for the completion of resource reservation.

In step 1033, the full address information ACM sent by the mobile switching center of the called terminal is received.

The MSC of the called terminal will reply an ACM message (address complete message, full address information) after receiving the IAM message sent by the outgoing MGCF unit, and the outgoing MGCF unit will receive the ACM message, indicating that the call is not in the form of resource reservation. Negotiation ends.

FIG. 5 is a flowchart of a negotiation call in the prior art where both the calling terminal and the called terminal are in the CS domain and adopt the form of resource reservation, wherein MSC A is the MSC of the calling terminal, and MGCF A is the access MGCF of the IMS network. unit, the called CSCF/AS is the CSCF unit or AS of the called terminal, MGCF B is the outgoing MGCF unit of the IMS network, and MSC B is the MSC of the called terminal. As shown in FIG. 5 , the process of negotiating a call in the form of resource reservation in which both the calling terminal and the called terminal are in the CS domain includes steps 201 to 218 .

Step 201, MSC A sends an IAM message to MGCF A.

Step 202, MGCF A sends an INVITE message to the called CSCF/AS.

Step 203, the called CSCF/AS sends an INVITE message to MGCF B.

Step 204, MSC B sends a 183 message to the called CSCF/AS.

Step 205, the called CSCF/AS sends a 183 message to MGCF A.

Step 206, MGCF A sends a PRACK message to the called CSCF/AS.

Step 207, the called CSCF/AS sends a PRACK message to MGCF B.

Step 208, MGCF B sends a 200 OK message to the called CSCF/AS.

Step 209, the called CSCF/AS sends a 200 OK message to MGCF A.

Step 210, MGCF A sends an UPDATE message to the called CSCF/AS.

Step 211, the called CSCF/AS sends an UPDATE message to MGCF B.

Step 212, MGCF B sends a 200 OK message to the called CSCF/AS.

Step 213, the called CSCF/AS sends a 200 OK message to MGCF A.

Step 214, MGCF B sends an IAM message to MSC B.

Step 215, MSC B sends an ACM message to MGCF B.

Step 216, MGCF B sends a 180 message to the called CSCF/AS.

Step 217, the called CSCF/AS sends a 180 message to MGCF A.

Step 218, MGCF A sends an ACM message to MSC A.

Wherein, steps 204 to 213 are resource reservation processes. The message transmitted between MGCF A, the called CSCF/AS and MGCF B can be regarded as the message transmitted between MGCF A and MGCF B.

FIG. 6 is a flowchart of a negotiation call in which the calling terminal and the called terminal are both in the CS domain and adopt a non-resource reservation form according to an embodiment of the present invention. MSC A is the MSC of the calling terminal, MGCF A is the access MGCF unit of the IMS network, the called CSCF/AS is the CSCF unit or AS of the called terminal, MGCF B is the outgoing MGCF unit of the IMS network, and MSC B is the The MSC of the called terminal. As shown in FIG. 6 , the process of negotiating a call in the form of non-resource reservation in which both the calling terminal and the called terminal are in the CS domain includes steps 301 to 310 .

Step 301, MSC A sends an IAM message to MGCF A.

Step 302, MGCF A sends an INVITE message to the called CSCF/AS.

Step 303, the called CSCF/AS sends an INVITE message to MGCF B.

Step 304, MSC B sends a 183 message to the called CSCF/AS.

Step 305, the called CSCF/AS sends a 183 message to MGCF A.

Step 306, MGCF B sends an IAM message to MSC B.

Step 307, MSC B sends an ACM message to MGCF B.

Step 308, MGCF B sends a 180 message to the called CSCF/AS.

Step 309, the called CSCF/AS sends a 180 message to MGCF A.

Step 310: MGCF A sends an ACM message to MSC A.

Among them, the message transmitted between MGCF A, the called CSCF/AS and MGCF B can be regarded as the message transmitted between MGCF A and MGCF B.

It can be seen from the comparison between FIG. 5 and FIG. 6 that in the embodiment of the present invention, the calling terminal and the called terminal are both in the CS domain and the negotiation call in the form of non-resource reservation does not require resource reservation, which can simplify the calling terminal and the called terminal. The call flow between the calling terminals can be reduced, thereby reducing the call delay when both the calling terminal and the called terminal are in the CS domain.

FIG. 7 is a schematic structural diagram of an MGCF unit 400 in an embodiment of the present invention. As shown in FIG. 7 , the MGCF unit 400 includes an invitation receiving module 401 , a judging module 402 and a non-resource reservation module 403 .

The invitation receiving module 401 may be configured to receive an invitation message for calling the called terminal when the called terminal resides in the circuit-switched CS domain.

The judging module 402 may be configured to judge whether the SBC-domain parameter sbc-domain is included in the invitation message.

The non-resource reservation module 403 may be configured to perform call negotiation in the form of non-resource reservation if it is determined that the invitation message does not contain the sbc-domain parameter.

An embodiment of the present invention provides an MGCF unit. When the called terminal resides in the CS domain, the MGCF unit receives an invitation message and determines whether the invitation message contains the sbc-domain parameter. If the invitation message does not contain the sbc-domain parameter, Indicates that the invitation information comes from the access MGCF unit of the IMS network, that is to say, the calling terminal also resides in the CS domain, the call negotiation in the form of non-resource reservation is used, and the step of resource reservation is not required, thus eliminating the need for The time spent in performing call negotiation in the form of resource reservation reduces the delay in making a call when both the calling terminal and the called terminal are located between the CS domains.

FIG. 8 is a schematic structural diagram of an MGCF unit 400 in another embodiment of the present invention. The difference between FIG. 8 and FIG. 7 is that the MGCF unit 400 shown in FIG. 8 further includes a resource reservation module 404 . The resource reservation module 404 may be configured to perform call negotiation in the form of resource reservation if it is determined that the invitation message contains the sbc-domain parameter.

In an example of the embodiment of the present invention, the above judgment module 402 may be specifically configured to judge whether the access network information P-Access-Network-Info header field of the invitation message contains the sbc-domain parameter.

In another example of the embodiment of the present invention, the above-mentioned non-resource reservation module 403 may be specifically configured to: send an invitation reply message to the access MGCF unit of the IMS network, and the request header field of the invitation reply message does not indicate resource reservation ; Send the starting address information IAM to the mobile switching center of the called terminal; receive the address right reply message ACM sent by the mobile switching center of the called terminal.

In another example of the embodiment of the present invention, the above-mentioned non-resource reservation module 403 may be specifically configured to: send an invite reply message to the call session control function CSCF unit or the application server of the called terminal, so that the CSCF unit or the application server The invitation reply message is forwarded to the access MGCF unit of the IMS network.

The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an application specific integrated circuit (ASIC), suitable firmware, a plug-in, a function card, or the like. When implemented in software, elements of the invention are programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted over a transmission medium or communication link by a data signal carried in a carrier wave. A "machine-readable medium" may include any medium that can store or transmit information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, and the like. The code segments may be downloaded via a computer network such as the Internet, an intranet, or the like.

To be clear, the present invention is not limited to the specific arrangements and processes described above and shown in the figures. Also, for the sake of brevity, detailed descriptions of known methods and techniques are omitted here. In the above-described embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order of steps after comprehending the spirit of the present invention.

Claims (8)

1. a resource reservation control method, is characterized in that, comprises: When the called terminal resides in the circuit-switched CS domain, the outgoing media gateway control function MGCF unit of the network protocol multimedia subsystem IMS network receives the invitation message for calling the called terminal; judging whether the invitation message contains the session border controller domain sbc-domain parameter; If it is determined that the invitation message does not contain the sbc-domain parameter, call negotiation in the form of non-resource reservation is performed; the steps of performing the call negotiation in the form of non-resource reservation include: sending an invitation reply message to the access MGCF unit of the network protocol multimedia subsystem IMS network, where the request header field of the invitation reply message does not indicate resource reservation; Send starting address information IAM to the mobile switching center of the called terminal; Receive the full address information ACM sent by the mobile switching center of the called terminal. 2. The method of claim 1, further comprising: If it is determined that the invitation message contains the sbc-domain parameter, call negotiation in the form of resource reservation is performed. 3. The method according to claim 1, wherein the step of judging whether the invitation message contains a session border controller domain sbc-domain parameter comprises: Determine whether the access network information P-Access-Network-Info header field of the invitation message contains the sbc-domain parameter. 4. The method according to claim 1, wherein the step of sending an invitation reply message to an access MGCF unit of the IMS network comprises: The invitation reply message is sent to the call session control function CSCF unit of the called terminal or the application server, so that the CSCF unit or the application server forwards the invitation reply message to the access MGCF unit of the IMS network. 5. an MGCF unit, is characterized in that, comprises: an invitation receiving module, configured to receive an invitation message for calling the called terminal when the called terminal resides in the circuit-switched CS domain; a judging module, configured to judge whether the invitation message contains the session border controller domain sbc-domain parameter; The non-resource reservation module is configured to perform call negotiation in the form of non-resource reservation if it is determined that the invitation message does not contain the sbc-domain parameter; the non-resource reservation module is specifically configured as: sending an invitation reply message to the access MGCF unit of the IMS network, where the request header field of the invitation reply message does not indicate resource reservation; Send starting address information IAM to the mobile switching center of the called terminal; Receive the full address information ACM sent by the mobile switching center of the called terminal. 6. MGCF unit according to claim 5, is characterized in that, also comprises: The resource reservation module is configured to perform call negotiation in the form of resource reservation if it is determined that the invitation message contains the sbc-domain parameter. 7 . The MGCF unit according to claim 5 , wherein the judging module is specifically configured to judge whether the access network information P-Access-Network-Info header field of the invitation message contains an sbc-domain parameter. 8 . 8. The MGCF unit according to claim 5, wherein the non-resource reservation module is specifically configured as: The invitation reply message is sent to the call session control function CSCF unit of the called terminal or the application server, so that the CSCF unit or the application server forwards the invitation reply message to the access MGCF unit of the IMS network.

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