WO2009043289A1

WO2009043289A1 - Method for determining the media stream path relation and call control system

Info

Publication number: WO2009043289A1
Application number: PCT/CN2008/072517
Authority: WO
Inventors: Tao Zhang
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-09-29
Filing date: 2008-09-25
Publication date: 2009-04-09
Also published as: CN101399822A; CN101399822B

Abstract

A method for determining the media stream path relation involves selecting media transfer address which is used to determining the media stream path relation from the private network address associated with user equipment and public network address by judging whether the user equipments of the both calling sides can communicate with each other directly. The invention also provides corresponding call control system, session control function entity and strategy decision-making function entity. The invention solution, when the user equipments of the both calling sides are within the same address region, enable to determine the direct path in the private network to carry media streams of the both calling sides; here the media stream path established need not to be transferred by public address provided by an edge gateway equipment, which not only decreases processing load of the edge gateway equipment, but also reduces the use of public address, and lowers the calling failure probability caused by the limited public network address.

Description

Method for determining media stream path relationship and call control system

This application claims priority to Chinese Patent Application No. 200710161532.3, entitled "Method for Determining Media Flow Path Relationship and Call Control System", filed on September 29, 2007, the entire contents of which are incorporated by reference. In this application.

Technical field

The present invention relates to the field of communication technologies, and in particular, to a method for determining a relationship of a media stream path and a corresponding call control system.

Background technique

IP Protocol (IP) The Multimedia Subsystem (IMS) is a novel form of multimedia service that meets the needs of end-customer diverse multimedia services. At present, IMS is considered to be the core technology of the next generation network, and is an important way to solve the convergence of mobile and fixed networks and introduce differentiated services such as voice, data and video triple integration.

The IMS network usually includes functional entities such as Proxy Call Session Control Function (P-CSCF: Proxy Call Session Control Function), Policy Decision Function (PDF), and Border Gateway Function (BGF). A simplified schematic diagram of an IMS network structure is shown in FIG. 1. In FIG. 1, user equipment (UE: User Equipment) 1 and UE 2 communicate through an IMS network, and P-CSCF 1, PDF 1 and BGF 1 are IMS on the UE 1 side. The functional entity, P-CSCF 2, PDF 2 and BGF 2 are IMS functional entities on the UE 2 side. The UE and the P-CSCF and the P-CSCF use call control signaling to interact with each other (indicated by a dotted line in Figure 1), and the bearer control signaling is used between the P-CSCF and the PDF and between the PDF and the BGF. (indicated by a double dashed line in Figure 1), the media stream is transmitted between UEs via the BGF in accordance with the determined media stream path (shown in solid lines in Figure 1).

At present, when the UE 1 initiates a call to the UE 2, the method for determining the path relationship of the media stream is as shown in FIG. 2, including:

1) UE 1 initiates a call to UE 2 to P-CSCF 1, which carries the private network address of UE 1.

2) The P-CSCF 1 obtains the private network address 1 and the public network address 1 bound to the private network address of the UE 1, and the P-CSCF 1 requests the BGF 1 to allocate the private network of the UE 1 through the PDF 1 using bearer control signaling. The private network address 1 and the public network address 1 bound to the address; BGF is determined by binding the private network address 1 to the private network address of UE 1. 1 to the path relationship of UE 1; public network address 1 is used for BGF 1 to perform media stream transmission on behalf of UE 1. 3) The P-CSCF 1 sends a call request of the UE 1 to the UE 2 to the P-CSCF 2 to which the UE 2 belongs, and the call request carries the public network address 1.

4) The P-CSCF 2 uses the bearer control signaling to request the BGF 2 to allocate the private network address 2 and the public network address 2 through the PDF 2, and bind the public network address 1 to the public network address 2; The public network address 1 determines the path relationship between BGF 2 and BGF 1. The private network address 2 is used by BGF 2 to transmit the media stream of public network address 2 in the private network.

5) The P-CSCF 2 sends a call request carrying the private network address 2 to the UE 2, and determines the path relationship between the UE 2 and the BGF 2.

6) UE 2 returns a call response carrying the private network address of UE 2 to P-CSCF 2.

7) The P-CSCF 2 uses the bearer control signaling to request the BGF 2 to bind the private network address of the UE 2 to the private network address 2 by using the bearer control signaling, and determine the path relationship of the BGF 2 to the UE 2.

8) The P-CSCF 2 returns a call response carrying the public network address 2 to the P-CSCF 1.

9) The P-CSCF 1 uses the bearer control signaling to request the BGF 1 to bind the public network address 2 to the public network address 1 by using the bearer control signaling, that is, to determine the path relationship of the BGF 1 to the BGF 2.

10) The P-CSCF 1 returns the call response carrying the private network address 1 to the UE 1, that is, determines the path relationship of the UE 1 to the BGF 1.

At this time, the UE 1 communicates with the private network address 1 of the BGF 1 by its own private network address. The BGF 1 communicates with the public network address 2 of the BGF 2 by the public network address 1 according to the binding relationship of the address, BGF 2 According to the binding relationship of the address, the private network address 2 represents the public network address 2 and communicates with the private network address of the UE 2; the established media stream path is as shown in FIG. 3 . The media stream path determined by the method needs to be transited through the public network address provided by the BGF, and when the user equipments of the calling parties are in the same address domain, for example, UE1 and UE2 are in the same private network, which is obviously not the best medium. The flow path will cause path redundancy and increase the processing load of the BGF and waste the public network address.

Summary of the invention

Embodiments of the present invention provide a method for determining a path relationship of a media stream, and a corresponding call control system, a policy decision function entity, and a session control function entity, for effectively avoiding path redundancy. A method for determining a relationship of a media stream path, comprising: receiving a first call request of a first user to a second user, where the first call request carries a private network address of the first user; a call request, the second call request carrying a private network address of the first user and a first public network address bound to the private network address of the first user; receiving the returned corresponding to the second call request The second call response carries a media transmission address of the second user that matches the media transmission address of the first user; the media transmission address of the first user is the first public network address or the private network of the first user Address, the media transmission address of the second user is a second public network address or a private network address of the second user; and returning with the first call according to the media transmission address of the second user carried in the second call response And requesting a corresponding first call response, where the first call response carries destination address information of the first user next hop.

A method for determining a relationship of a media stream path, comprising: receiving a second call request to a second user, where the second call request carries a first public network address and a private network address of the first user; The call request obtains the registered address of the second user, and determines whether the first user and the second user can directly communicate according to the private network address of the first user and the registered address of the second user, and determines the media of the first user according to the determination result. Transmitting an address, the media transmission address of the first user is a first public network address or a private network address of the first user; obtaining a media transmission address of the second user that matches the media transmission address of the first user, and returning The second call response corresponding to the second call request, where the second call response carries a media transmission address of the second user.

A method for determining a relationship of a media stream path, comprising: receiving a second call request to a second user, where the second call request carries a first public network address and a private network address of the first user; The second call request obtains the registration address of the second user, and sends a bearer address selection request, where the bearer address selection request carries the first public network address, the private network address of the first user, and the registered address of the second user; Returning a bearer address selection response corresponding to the bearer address selection request, the bearer address selection response carries a media transmission address of the first user, and the media transmission address of the first user is a first public network address or the first a private network address of the user; obtaining a media transmission address of the second user that matches the media transmission address of the first user, and returning a second call response corresponding to the second call request, where the second call response carries The media transfer address of the second user.

A method for determining a path relationship of a media stream, comprising: receiving a bearer address selection request, where the bearer address selection request carries a first public network address, a private network address of the first user, and a registration of the second user The first user's private network address and the second user's registered address determine whether the first user and the second user can directly communicate; the first user's media transmission address is determined according to the determination result, and the first user's media The transport address is the first public network address or the private network address of the first user; the bearer address selection response corresponding to the bearer address selection request is returned, and the bearer address selection response carries the media transport address of the first user.

A method for determining a relationship of a media stream path, comprising: receiving a first call request of a first user to a second user, where the first call request carries a private network address of the first user; determining that the second user belongs to The session control function entity obtains the registration address of the second user, and sends a bearer mode determination request, where the bearer mode determination request carries the private network address of the first user and the registration address of the second user; The bearer mode determining response corresponding to the bearer mode determining request carries the information indicating whether the first user and the second user can directly communicate; and determining, according to the bearer mode, the first user and the carrying Determining, by the second user, whether the first user and the second user can directly communicate; obtaining a private network address of the second user, and returning a first call response corresponding to the first call request, the first The call response carries the private network address of the second user.

A method for determining a relationship of a media stream path, comprising: receiving a bearer mode determining request, where the bearer mode determining request carries a private network address of a first user and a registered address of a second user; according to the private network of the first user The address and the registration address of the second user determine whether the first user and the second user can directly communicate; return a bearer mode determination response corresponding to the bearer mode determination request, and the bearer mode judgment response carries a corresponding to the judgment result Information.

A session control function entity, comprising: a call receiving unit, configured to obtain a first call request of a first user to a second user, where the first call request carries a private network address of the first user;

a call connection unit, configured to send a second call request to the second user, where the second call request carries a private network address of the first user and a first public network address bound to the private network address of the first user And a response obtaining unit, configured to obtain a returned second call response corresponding to the second call request, where the second call response carries a media transmission address of the second user that matches the media transmission address of the first user, The media transmission address of the first user is the first public network address or the private network address of the first user, and the media transmission address of the second user is the second public network address or the private network address of the second user; a unit, configured to return, according to the media transmission address of the second user carried by the second call response, Returning to the first call response corresponding to the first call request, the first call response carries destination address information of the first user next hop.

A call control system, comprising: a session obtaining unit, configured to obtain a second call request to a second user, where the second call request carries a first public network address and a private network address of the first user; Determining, according to the second call request, a registration address of the second user; the policy decision unit, configured to determine, according to the private network address of the first user, and the registration address of the second user, whether the first user and the second user can Directly communicating, determining a media transmission address of the first user according to the determination result, the media transmission address of the first user is a first public network address or a private network address of the first user; and an address obtaining unit, configured to obtain the a media transmission address of the second user that matches the media transmission address of the user; a session response unit, configured to return a second call response corresponding to the second call request, where the second call response carries the second user Media transfer address.

A session control function entity, comprising: a connection obtaining unit, configured to obtain a second call request sent to a second user, where the second call request carries a first public network address and a private network address of the first user; a negotiating unit, configured to obtain a registration address of the second user according to the second call request, and send a bearer address selection request, where the bearer address selection request carries the first public network address and the private content of the first user a network address and a registration address of the second user; a negotiation obtaining unit, configured to obtain a returned bearer address selection response corresponding to the bearer address selection request, where the bearer address selection response carries a media transmission address of the first user, where The media transmission address of the first user is the first public network address or the private network address of the first user; the address matching unit is configured to obtain a media transmission address of the second user that matches the media transmission address of the first user; a connection response unit, configured to return a second call response corresponding to the second call request, where the second call response carries The media transmission address of the second user.

A policy decision function entity, comprising: a selection obtaining unit, configured to obtain a bearer address selection request, where the bearer address selection request carries a first public network address, a private network address of the first user, and a registered address of the second user; An address selection unit, configured to determine whether the first user and the second user can directly communicate according to the private network address of the first user and the registration address of the second user, and determine a media transmission address of the first user according to the determination result, where The media transmission address of the first user is the first public network address or the private network address of the first user; the selection response unit is configured to return a bearer address selection response corresponding to the bearer address selection request, and the bearer address selection response Carrying the media transmission address of the first user. In the technical solution of the embodiment of the present invention, a media transmission address for determining a path relationship is selected from a private network address and a public network address associated with the user equipment by determining whether the user equipment of the calling party can directly communicate with each other. When the user equipment is in the same address domain, the media stream bearer of the two parties is determined by determining the direct path in the private network. The media stream path established at this time does not need to be transited through the public network address provided by the edge gateway device, which not only reduces the edge. The processing load of the gateway device also reduces the use of the public network address, effectively avoids the generation of redundant paths, and reduces the probability of call failure due to limited public network addresses.

DRAWINGS

1 is a simplified schematic diagram of a structure of an existing IMS network;

2 is a schematic flow chart of a method for determining a relationship of a media stream path;

3 is a schematic diagram of a media flow path determined according to an existing method;

4 is a schematic flowchart of a method for determining a path relationship of a media stream according to Embodiment 1 of the present invention;

5 is a schematic flowchart of a method for determining a path relationship of a media stream according to Embodiment 2 of the present invention;

6 is a schematic flow chart of a specific application method according to Embodiment 1 of the present invention;

7 is a schematic diagram of an address allocation process of an application example according to Embodiment 1 of the present invention;

8 is a schematic diagram of an address release procedure of an application example according to Embodiment 1 of the present invention;

9 is a schematic diagram of a media flow path determined in an application example of the first embodiment of the present invention; FIG. 10 is a schematic diagram of an address binding process of an application example according to Embodiment 1 of the present invention;

11 is a schematic diagram showing the logical structure of a third session control function entity according to an embodiment of the present invention;

12 is a schematic diagram showing the logical structure of a call control system according to a fourth embodiment of the present invention;

13 is a schematic diagram showing the logical structure of a five session control function entity according to an embodiment of the present invention;

FIG. 14 is a schematic diagram showing the logical structure of a sixth policy decision function entity according to an embodiment of the present invention.

detailed description

An embodiment of the present invention provides a method for determining a path relationship of a media stream, and determining whether a user equipment of the two parties can directly communicate with each other, and selecting a media transmission address for determining a path relationship from a private network address and a public network address associated with the user equipment. . Embodiments of the present invention also provide a corresponding call control system, a policy decision function entity, and a session control function entity. The following is a detailed description.

Embodiment 1 A method for determining a path relationship of a media stream. The process is as shown in FIG. 4, including the steps of: Al, the first call control system receives a first call request of the first user to the second user, The first call request carries the private network address of the first user.

The private network address of the user is the communication address used in the address domain, usually the network communication address in the address domain, such as 192.168.0.1, etc.; when the first user initiates a call to the second user, the call is used. The identifier of the second user may generally be a name that is easy to identify and memorize, such as UE2@abc.com, etc., and the first call control system may determine the second call control system to which the second user belongs according to the identifier of the second user. This step can be performed with reference to the existing method.

A2: The first call control system sends a second call request to the second user to the second call control system of the second user, where the second call request carries the private network address of the first user and the first user The first public network address bound to the private network address.

The call control system in the embodiment is a set of devices for controlling the call on the network side, and may be implemented by a single entity having comprehensive capabilities, or may be composed of multiple entities by using a hierarchical structure, for example, may include a session. Control function entities and policy decision function entities, etc. The obtaining of the first public network address bound to the private network address of the first user in this step can be performed by referring to the existing mode.

If the first call control system adopts a hierarchical structure including the first session control function entity and the first policy decision function entity, this step may be specifically performed as follows: After receiving the call, the first session control function entity uses bearer control signaling to pass The first policy decision function entity requests the first edge gateway device to allocate a first public network address bound to the private network address of the first user. Of course, the first edge gateway device also allocates the first private network address that is bound together at the same time as the communication address of the first user in the private network.

In order to facilitate subsequent identification of the address selection information returned by the second call control system, the first call control system may, in the second call request sent, place the first public network address and the private network address of the first user in the set position order. For example, the first user's private network address can be placed first, and the first public network address can be placed later.

A3. The second call control system obtains the registration address of the second user according to the second call request, and determines that the first user and the second user can be determined according to the private network address of the first user and the registration address of the second user. The direct communication is performed, and the media transmission address of the first user is determined according to the determination result, and the media transmission address of the first user is the first public network address or the private network address of the first user.

If the second call control system adopts a hierarchical structure including the second session control function entity and the second policy decision function entity, this step may be specifically implemented as:

1 The second session control function entity receives the second call request, and the second call request Obtaining a registration address of the second user, and sending a bearer address selection request to the second policy decision function entity, where the bearer address selection request carries the first public network address, the private network address of the first user, and the registered address of the second user .

The second session control function entity may obtain the registration address of the second user based on the identity of the second user used in the second call request.

The second policy decision function entity determines whether the first user and the second user can directly communicate according to the private network address of the first user and the registration address of the second user, and determines the media transmission address of the first user according to the determination result. The media transmission address of the first user is the first public network address or the private network address of the first user, and the bearer address selection response carrying the media transmission address of the first user is returned to the second session control function entity.

In this step, the second policy decision function entity performs the selection of the call bearer mode to determine whether the first user communicates with the second user directly or by using a public network address. Generally, whether the first user and the second user can directly communicate by determining whether the private network address of the first user and the registered address of the second user belong to the same address domain, if the information belongs to the same address domain, the communication can be directly performed. If you do not belong to the same address domain, you need to use the public network address for communication.

The second policy decision function entity may only carry the result of the bearer mode selection, that is, the media transport address of the first user, in this case, when the returned first public network address, the second The session control function entity may request the second edge gateway device to allocate the second public network address bound to the first public network address by using the second policy decision function entity by using the bearer address request in an existing manner.

Certainly, the second policy decision function entity may also combine the process of performing address selection and address allocation, that is, when the second policy decision function entity determines that the first user and the second user cannot directly communicate, except for selecting the first public network address as the first The operation of obtaining the second public network address bound to the first public network address is performed by the media transport address of the user, and the second public network address is added to the returned bearer address selection response. In this way, the second session control function entity only needs to deliver the bearer address selection request once. When the result of the selection is the first public network address, the bearer address request does not need to be sent again.

A4. The second call control system obtains a media transmission address of the second user that matches the media transmission address of the first user, and returns a second call response that carries the media transmission address of the second user to the first call control. system. According to the media transmission address of the first user selected in the previous step, the second call control system can be processed in two cases:

1 The first user's media transmission address is the first public network address, indicating that the first user and the second user need to use the public network address for communication, so the second call control system needs to obtain the second public network address as the first user. The media transfer address of the second user whose media transfer address matches.

If the second call control system adopts a hierarchical structure including the second session control function entity and the second policy decision function entity, according to the second policy decision function entity in the previous step, the different processing manner of the bearer address selection request, the second session The control function entity may continue to obtain the second public network address by using the bearer control signaling; or obtain the second public network address directly from the bearer address selection response returned by the second policy decision function entity. Thereafter, the second session control function entity can perform the determining operation of the media stream path relationship in an existing manner.

2 The media transmission address of the first user is the private network address of the first user, indicating that the first user and the second user can directly communicate, so the second call control system needs to obtain the private network address of the second user as the first user. The media transfer address of the second user whose media transfer address matches. The specific process can include:

a second call control system sends a third call request carrying the private network address of the first user to the second user;

b. The second user returns a third call response carrying the private network address of the second user to the second call control system.

If the second call control system employs a hierarchical structure including the second session control function entity and the second policy decision function entity, the operations in the above steps &, b are performed by the second session control function entity.

In addition, if the first call control system places the first public network address and the private network address of the first user in the set position sequence in the second call request sent, the second call control system may return and carry the following a second call response of the media transmission address of the second user: placing the media transmission address of the second user corresponding to the location of the media transmission address of the first user to which it matches in the second call request, The location corresponding to another address information in the second call request is set as an invalid address. For example, if the private network address of the first user in the second call request is placed first, and the first public network address is placed after the second call response, the second call response also carries two address information, and if the first address information is valid, For the private network address of the second user, if the first address information is invalid and the second address information is valid, The second public network address. The invalid address can be set based on the agreement of both parties, for example, treating the all 0 address as an invalid address. For example: the address placed in the second call request is [1.1丄1; 2.2.2.2], assuming that the private network address of the first user is in the front and the first public network address is in the back; the second call response is [0.0.0.0; 3.3.3.3]; Because the previous address in the second call response is invalid, it is judged that the second public network address 3.3.3.3 matching the first public network address 2.2.2.2 is returned, and then the subsequent path relationship is determined according to the existing path. The determination process continues.

The first call control system returns a first call response corresponding to the first call request according to the media transmission address of the second user carried in the second call response, where the first call response carries the Destination address information of the first user next hop.

The first call control system determines whether the first user and the second user can directly communicate according to the media transmission address of the second user carried in the second call response. The first call control system can determine the first user and the second user according to the location of the effective address in the second call response, based on the manner in which the second call control system places the media transmission address of the second user in the position order in the previous step. For direct communication or for communication via a public address. The first call control system is divided into two situations according to the judgment result:

1 The second user's media transmission address is a second public network address, indicating that the first user and the second user need to use the public network address for communication, and the first call control system may perform the path relationship determination operation in an existing manner, that is, The second public network address carried in the second call response is bound to the first public network address, and returns a first call response carrying the first private network address bound to the private network address of the first user.

2 The media transmission address of the second user is the private network address of the second user, indicating that the first user and the second user can directly communicate, and the first call control system returns to the first user the number of the private network address carrying the second user. A call response can directly determine the path relationship between the first user and the second user by using the private network address of the second user and the private network address of the first user.

In addition, after the first call control system determines that the first user and the second user are in direct communication, the first call control system may release the private binding to the first user in order not to waste the previously assigned first public network address. The first public network address of the network address. If the first call control system adopts a hierarchical structure including the first control function entity and the first policy decision function entity, this step may be specifically performed as follows: the first session control function entity uses bearer control signaling to pass the first policy decision The function entity requests the first edge gateway device to release the first public network address bound to the private network address of the first user; of course, the first edge The gateway device releases the first private network address that is bound together.

In the above embodiment, by determining whether the user equipment of the calling party can directly communicate on the called side, the media transmission address for determining the path relationship is selected from the private network address and the public network address associated with the calling party user equipment. When the user equipments of the calling parties are in the same address domain, the direct path in the private network can be determined to carry the media stream bearer of the two parties. The media stream path established at this time does not need to be transited through the public network address provided by the edge gateway device. The processing load of the edge gateway device is reduced, the use of the public network address is reduced, and the probability of call failure due to the limited public network address is reduced.

Embodiment 2 A method for determining a relationship of a media stream path is shown in FIG. 5.

The difference between the embodiment and the first embodiment is that the first embodiment adopts a method for judging whether the user equipment of the calling party can directly communicate with each other on the called side; in this embodiment, the user of the calling party is used at the calling side. The manner in which the device can directly communicate and judge is applicable to the case where the calling party and the called user belong to the same call control system. Of course, it is also feasible to adopt the first embodiment when the calling party and the called party belong to the same call control system. At this time, the first call control system and the second call control system are the same system. Since the solution of the embodiment and the solution of the first embodiment are performed on the calling and called sides respectively, in the actual application, the solution of the first embodiment and the embodiment may be used separately, or may be used in combination. The method of this embodiment specifically includes the following steps:

B1. The first session control function entity receives a first call request of the first user to the second user, where the first call request carries a private network address of the first user.

B2. The first session control function entity determines that the second user belongs to the session control function entity, and obtains a registration address of the second user.

B3. The first session control function entity sends a bearer mode determining request to the first policy decision function entity, where the bearer mode determining request carries the private network address of the first user and the registered address of the second user.

B4. The first policy decision function entity determines whether the first user and the second user can directly communicate according to the private network address of the first user and the registration address of the second user, and returns a bearer mode judgment response carrying the judgment result to the first A session control function entity.

Similar to sub-step 2 of step A3 in the first embodiment, the first policy decision function entity may only carry the judgment of whether the first user and the second user can directly communicate in the returned bearer mode judgment response. Break the result, which is "yes" or "no". In this case, when the returned result is "No", the first control function entity may request the first edge gateway device to be allocated with the first user by the first policy decision function entity again using the bearer address request according to the existing manner. The first public network address bound to the private network address.

Of course, the first policy decision function entity may also perform the process of performing bearer mode judgment and address assignment, that is, when the first policy decision function entity determines that the first user and the second user cannot directly communicate, the first policy and the first user are also performed. The operation of the first public network address bound to the private network address returns the first public network address as the result of the determination of "No". In this way, the first session control function entity only needs to issue the bearer mode judgment request once, and when the judgment result is "No", it is not necessary to issue the bearer address request again.

B5. The first session control function entity determines a response according to the bearer mode, and determines whether the first user and the second user can directly communicate; when it is determined to be capable, step B6 is performed; when the determination is no, step B7 is performed.

B6. The first session control function entity obtains the private network address of the second user, and returns a first call response carrying the private network address of the second user to the first user, that is, the private network address of the first user and the second user. The private network address determines the path relationship of the first user to the second user.

This step can be performed by referring to Case 2 in the first step A5 of the first embodiment. At this time, the first session control function entity is the second session control function entity.

B7. The first session control function entity obtains the private network address of the second user and the public network address of the first user and the second user, and determines the first user to the second user by using the public network addresses of the first user and the second user. The path relationship, that is, the need to perform an existing address interaction process.

This step can be performed by referring to the existing method of determining the relationship of the media stream path.

In the above embodiment, by determining whether the user equipment of the calling party can directly communicate on the calling side, the private network address or the public network address associated with the calling party user equipment is selected as the media transmission address for determining the path relationship, when both parties call When the user equipment is in the same address domain, the direct path in the private network can be determined to carry the media stream bearer of the two parties. The media stream path established at this time does not need to be transited through the public network address provided by the edge gateway device, which not only reduces the edge. The processing load of the gateway device also reduces the use of the public network address, and reduces the probability of call failure due to the limited public network address.

For a better understanding of the above embodiments, a specific application of the method of the first embodiment will be further described in detail below. The application scenario is: the first user UE 1 initiates a call to the second user UE 2,

The IMS network adopts the structure shown in FIG. The process is shown in Figure 6, including the steps: 1) The UE 1 initiates a first call request to the UE 2 to the P-CSCF 1, the first call request carrying the private network address of the UE 1.

2) The P-CSCF 1 obtains the private network address 1 and the public network address 1 for the media stream transmission of the current call, and binds the private network address of the UE 1 to the private network address 1 and the public network address 1. The specific process is shown in Figure 7, which includes:

2.1) P-CSCF 1 sends a bearer address request carrying the private network address of UE 1 to PDF 1;

2.2) PDF 1 sends a bearer address request carrying the private network address of UE 1 to BGF 1;

2.3) BGF 1 assigns a private network address 1 and a public network address 1, and binds to the private network address of UE 1, and then returns a bearer address response carrying private network address 1 and public network address 1 to PDF 1;

The private network address 1 is used for media stream transmission between the UE 1 and the BGF 1 in the private network, and the public network address 1 is used by the BGF 1 to transmit the media stream of the UE 1 to the outside. The path relationship between the BGF 1 and the UE 1 is determined by binding the private network address 1 and the private network address of the UE 1. The public network address 1 that is bound together is the transport address of the private network address.

2.4) PDF 1 returns to P-CSCF 1 the bearer address response carrying private network address 1 and public network address 1. 3) The P-CSCF 1 sends a second call request to the UE 2 to the P-CSCF 2 to which the UE 2 belongs, and the second call request carries the public network address 1 and the private network address of the UE 1.

4) The P-CSCF 2 obtains the registration address of the UE 2, and sends a bearer address selection request to the PDF 2, and the bearer address selection request carries the public network address 1, the private network address of the UE 1, and the registered address of the UE 2.

5) The PDF 2 determines whether the UE 1 and the UE 2 can communicate directly, that is, whether the private network address of the UE 1 and the registered address of the UE 2 belong to the same address domain, and if so, the processing is performed according to the situation; if not, then Follow the second step of the situation.

Situation 1:

6) PDF 2 determines that UE 1 and UE 2 can communicate directly, and return to the P-CSCF 2 an address address selection response carrying the private network address of UE 1.

7) The P-CSCF 2 determines that the UE 1 and the UE 2 are in direct communication, and sends a third call request carrying the private network address of the UE 1 to the UE 2, that is, determining the path relationship between the UE 2 and the UE 1.

8) UE 2 returns a third call response carrying the private network address of UE 2 to P-CSCF 2.

9) The P-CSCF 2 determines that UE 1 and UE 2 are in direct communication, and returns a second call response carrying the private network address of UE 2 to P-CSCF 1. 10) The P-CSCF 1 determines that the UE 1 and the UE 2 are in direct communication, and releases the private network address 1 and the public network address 1 originally requested to be allocated. The specific process is shown in Figure 8, including:

10.1) The P-CSCF 1 sends a bearer address release request carrying the private network address of the UE 1 to the PDF 1;

10.2) PDF 1 sends a bearer address release request carrying the private network address of UE 1 to BGF 1; 10.3) BGF 1 releases the private network address 1 and public network address 1 bound to the private network address of UE 1, releasing tBGF 1 Go to the path of UE 1, and then return the load release response to PDF 1;

10.4) PDF 1 returns the bearer address release response to P-CSCF 1.

11) The P-CSCF 1 returns a first call response carrying the private network address of the UE 2 to the UE 1, and determines the next hop destination address information of the UE 1, that is, determines the path relationship between the UE 1 and the UE 2.

At this time, UE 1 and UE 2 can directly communicate through the private network addresses of the two parties, and the established media stream path is as shown in FIG.

Case 2:

12) PDF 2 determines that UE 1 and UE 2 need to communicate through the public network address, and allocate the private network address 2 and the public network address 2 for the media stream transmission to the UE 2 side, and the public network address 1 and the private network address 2 and Public network address 2 is bound. The specific process is similar to steps 2.2) and 2.3) and is not mentioned.

13) PDF 2 returns a bearer address selection response to the P-CSCF 2, and the bearer address selection response carries the public network address 1, the private network address 2, and the public network address 2.

14) The P-CSCF 2 determines that the UE 1 and the UE 2 transmit a third call request carrying the private network address 2 to the UE 2 by communicating via the public network address.

15) The UE 2 returns to the P-CSCF 2 a third call response carrying the private network address of the UE 2.

16) The P-CSCF 2 determines that the UE 1 and the UE 2 are bound by the public network address, and the private network address of the UE 2 is bound to the private network address 2. The specific process is shown in Figure 10, including:

16.1) The P-CSCF 2 sends a bearer address binding request carrying the private network address of the UE 2 and the private network address 2 to the PDF 2;

16.2) PDF 2 sends a bearer address binding request carrying the private network address of UE 2 and the private network address 2 to BGF 2;

16.3) BGF 2 binds the private network address of the UE 2 to the private network address 2, and returns a bearer address binding response to the PDF 2, where the bearer address binding response indicates that the binding is successful;

16.4) PDF 2 returns the bearer address binding response to P-CSCF 2. 17) The P-CSCF 2 determines that the UE 1 and the UE 2 return a second call response carrying the public network address 2 to the P-CSCF 1 by communicating over the public network address.

18) The P-CSCF 1 determines that the UE 1 and the UE 2 communicate with each other through the public network address, and binds the public network address 2 returned by the P-CSCF 2 to the public network address 1 on the BGF 1. The specific procedure is the same as the step 16), except that the bearer address binding request carries the public network address 2 and the public network address 1.

19) The P-CSCF 1 returns to the UE 1 a first call response carrying the private network address 1.

The media stream path between the UE 1 and the UE 2 is: the private network address of the UE 1, the private network address 1, the public network address 1, the public network address 2, the private network address 2, and the private network address of the UE 2; The media flow path is as shown in Figure 3, which is the same as determined by the existing method.

The session control function entity, the call control system, and the policy decision function entity of the embodiment of the present invention are described in detail below.

Embodiment 3 The embodiment of the present invention further provides a session control function entity, which is configured to carry two types of addresses to the peer call control system during the call connection process, and select the address type according to the peer call control system. Perform call connection, as shown in Figure 11, including:

The call receiving unit 11 is configured to obtain a first call request of the first user to the second user, where the first call request carries a private network address of the first user;

The call connection unit 12 is configured to send a second call request to the second user, where the second call request carries a private network address of the first user and a first public network address bound to the private network address of the first user. The response obtaining unit 13 is configured to obtain a returned second call response corresponding to the second call request generated by the call connection unit 11, the second call response carrying the second user that matches the media transmission address of the first user a media transmission address, where the media transmission address of the first user is a first public network address or a private network address of the first user, and the media transmission address of the second user is a second public network address or a private network address of the second user;

The response processing unit 14 is configured to generate, according to the media transmission address of the second user carried by the second call response obtained by the response obtaining unit 13, a first call response corresponding to the first call request, the first call response Carrying destination address information of the first user next hop.

The response processing unit 14 may specifically include:

The determining unit 141 is configured to determine, according to the media transmission address of the second user that is carried by the second call response obtained by the response obtaining unit 12, that the first user and the second user are in direct communication or through the public network. Address communication

The public network unit 142 is configured to: when the determining unit 141 determines that the first user and the second user communicate by using the public network address, return a first call response corresponding to the first call request, where the first call response carries a first private network address bound to the private network address of the first user;

The private network unit 143 is configured to: when the determining unit 141 determines that the first user and the second user are in direct communication, return a first call response corresponding to the first call request, where the first call response carries the first The private network address of the second user.

The response processing unit 14 may further include:

The binding release unit 144 is configured to release the first public network address bound to the private network address of the first user when the determining unit 141 determines that the first user and the second user are in direct communication.

The session control function entity of this embodiment can be used to perform the operation of the first call control system in the method of determining the media stream path relationship described in the first embodiment.

Embodiment 4 The embodiment of the present invention further provides a call control system, configured to select two types of addresses sent by a peer call control system during a call connection process, and perform call connection according to the selection result, as shown in FIG. 12 . As shown, including:

a tongue obtaining unit 201, configured to obtain a second call request to the second user, where the second call request carries the first public network address and the private network address of the first user; and is obtained according to the second call request The registered address of the second user;

The policy decision unit 202 is configured to determine, according to the private network address of the first user and the registration address of the second user that the session obtaining unit 201 provides, whether the first user and the second user can directly communicate, and determine the media of the first user according to the determination result. a transmission address, where the media transmission address of the first user is a first public network address or a private network address of the first user;

The address obtaining unit 203 is configured to obtain a media transmission address of the second user that matches the media transmission address of the first user provided by the policy decision unit 202;

The session response unit 204 is configured to return a second call response corresponding to the second call request obtained by the session obtaining unit 201, where the second call response carries the media transmission address of the second user provided by the address obtaining unit 203.

The call control system of this embodiment can be used as the second call control system to perform the method for determining the media stream path relationship described in Embodiment 1. Embodiment 5 The embodiment of the present invention further provides a session control function entity, configured to request a PDF to select two types of addresses sent by the received peer call control system during a call connection process, according to the selection result. The call connection, as shown in Figure 13, includes:

The connection obtaining unit 21 is configured to obtain a second call request for the second user, where the second call request carries the first public network address and the private network address of the first user;

The address negotiation unit 22 is configured to obtain a registration address of the second user according to the second call request obtained by the connection obtaining unit 21, and send a bearer address selection request, where the bearer address selection request carries the first public network address, the first user Private network address and registered address of the second user;

The negotiation obtaining unit 23 is configured to obtain a returned bearer address selection response corresponding to the bearer address selection request generated by the address negotiation unit 22, where the bearer address selection response carries the media transmission address of the first user, and the media transmission of the first user The address is the first public network address or the private network address of the first user; the address matching unit 24 is configured to obtain a second matching with the media transmission address of the first user carried in the bearer address selection response received by the negotiation obtaining unit 23 User's media transfer address;

The connection response unit 25 is configured to return a second call response corresponding to the second call request obtained by the connection obtaining unit 21, where the second call response carries the media transmission address of the second user obtained by the address matching unit 24.

The address matching unit 24 may specifically include:

a determining subunit 241, configured to determine, according to the bearer address selection response, whether the first user and the second user can directly communicate;

The public network sub-unit 242 is configured to obtain the second public network address as the media transmission address of the second user when the determining sub-unit 241 determines that the first user and the second user cannot directly communicate;

The private network sub-unit 243 is configured to obtain the private network address of the second user as the media transmission address of the second user when the determining sub-unit 241 determines that the first user and the second user can directly communicate.

The session control function entity of this embodiment may be used as the second session control function entity to perform the method for determining the media stream path relationship described in Embodiment 1.

The sixth embodiment of the present invention further provides a policy decision function entity, which is used to select a communication mode to be used between users according to the request of the P-CSCF in the process of call connection, as shown in FIG. :

The obtaining unit 31 is configured to obtain a bearer address selection request, where the bearer address selection request carries The first public network address, the private network address of the first user, and the registration address of the second user; the address selection unit 32 is configured to: according to the private network of the first user carried by the bearer address selection request received by the selection obtaining unit 31 The address and the registration address of the second user determine whether the first user and the second user can directly communicate, and determine the media transmission address of the first user according to the determination result, where the media transmission address of the first user is the first public network address or the first User's private network address;

The selection response unit 33 is configured to return a bearer address selection response corresponding to the bearer address selection request obtained by the selection obtaining unit 31, the bearer address selection response carrying the media transmission address of the first user determined by the address selection unit 32.

The policy decision function entity in this embodiment may further include:

The binding obtaining unit 34 is configured to obtain, when the address selecting unit 32 determines that the first user and the second user cannot directly communicate, obtain a second public network address bound to the first public network address; The returned bearer address selection response returned by 33 also carries the second public network address.

The policy decision function entity of this embodiment may be used as the second policy decision function entity to perform the method for determining the media stream path relationship described in Embodiment 1.

A person skilled in the art can understand that all or part of the steps in the foregoing embodiment method can be completed by a program instructing related hardware, and the program can be stored in a computer readable storage medium, and the program includes the above when executed. All or part of the steps in the method of the embodiment, the storage medium may include: a ROM, a RAM, a magnetic disk or an optical disk, and the like.

It can be seen that the foregoing embodiment of the present invention determines the media transmission address used to determine the path relationship from the private network address and the public network address associated with the user equipment by determining whether the user equipment of the calling party can directly communicate. When the user equipments of the calling parties are in the same address domain, the direct path in the private network can be determined to carry the media stream bearer of the two parties. The media stream path established at this time does not need to be transited through the public network address provided by the edge gateway device. It not only reduces the processing load of the edge gateway device, but also reduces the use of the public network address, effectively avoids the generation of redundant paths, and reduces the probability of call failure due to the limited public network address.

The method for determining the relationship of the media stream path and the corresponding call control system, the policy decision function entity and the session control function entity are provided in detail in the above embodiments, and are used herein to help understand the method and core of the present invention. Thought; at the same time, for the average person in the field In the above, the description of the present invention is not limited to the scope of the present invention.

Claims

Rights request

A method for determining a relationship of a media stream path, comprising:

Receiving, by the first user, a first call request to the second user, where the first call request carries a private network address of the first user;

Sending a second call request to the second user, where the second call request carries a private network address of the first user and a first public network address bound to the private network address of the first user;

Receiving a returned second call response corresponding to the second call request, the second call response carrying a media transmission address of a second user that matches a media transmission address of the first user; a media transmission address of the first user The first public network address or the private network address of the first user, where the media transmission address of the second user is the second public network address or the private network address of the second user;

Returning, according to the media transmission address of the second user carried in the second call response, a first call response corresponding to the first call request, where the first call response carries the purpose of the first user next hop Address information.

The method for determining a path relationship of a media stream according to claim 1, wherein the returning the first corresponding to the first call request according to the media transmission address of the second user carried in the second call response The steps of the call response include:

Determining, according to the media transmission address of the second user carried in the second call response, that the first user and the second user are in direct communication;

Returns the first call response carrying the private network address of the second user.

The method for determining a media stream path relationship according to claim 2, further comprising: after determining that the first user and the second user are in direct communication, further comprising:

Release the first public network address bound to the private network address of the first user.

A method of determining a media stream path relationship according to any one of claims 1 - 3, characterized in that

In the step of sending the second call request, placing the first public network address and the private network address of the first user in the second call request in the set position order;

In the returned second call response, the media transmission address of the second user is placed corresponding to the location of the media transmission address of the first user that it matches in the second call request, and the second call request The address corresponding to another address information in the address is an invalid address; The step of returning the first call response corresponding to the first call request according to the media transmission address of the second user carried by the second call response includes:

Determining, by the location of the effective address in the second call response, that the first user and the second user are in direct communication or communicating through a public network address;

Returning, by the first user and the second user, a first call response carrying a private network address of the second user;

When the first user and the second user communicate through the public network address, the first call response carrying the first private network address bound to the private network address of the first user is returned.

5. A method for determining a path relationship of a media stream, the method comprising:

Receiving a second call request to the second user, where the second call request carries a first public network address and a private network address of the first user;

Determining, according to the second call request, the registration address of the second user, determining whether the first user and the second user can directly communicate according to the private network address of the first user and the registration address of the second user, and determining, according to the determination result a media transmission address of the user, where the media transmission address of the first user is a first public network address or a private network address of the first user;

Obtaining a media transmission address of the second user that matches the media transmission address of the first user, and returning a second call response corresponding to the second call request, where the second call response carries the second user Media transfer address.

6. A method for determining a relationship of a media stream path, the method comprising:

Obtaining a registration address of the second user according to the second call request, and sending a bearer address selection request, where the bearer address selection request carries the first public network address, the private network address of the first user, and the second user Registered address;

And receiving, by the bearer address selection response, the bearer address selection response, where the bearer address selection response carries the media transmission address of the first user, and the media transmission address of the first user is the first public network address or the first The private network address of a user;

Obtaining a media transmission address of the second user that matches the media transmission address of the first user, Returning a second call response corresponding to the second call request, where the second call response carries a media transmission address of the second user.

The method for determining a path relationship of a media stream according to claim 6, wherein when the bearer address selection response carries the first public network address, the bearer address selection response further carries Second public network address;

The step of obtaining the media transmission address of the second user that matches the media transmission address of the first user is specifically: selecting the first public network address carried in the response according to the bearer address, and selecting a response from the bearer address The second public network address is obtained, and the media transmission address of the second user is the second public network address.

The method for determining a media stream path relationship according to claim 6, wherein the media transmission address of the first user carried in the bearer address selection response is a private network address of the first user; The step of matching the media transmission address of the second user of the media transmission address of the first user includes:

Determining, by the first user and the second user, that the first user and the second user are in direct communication according to the media transmission address of the first user carried in the bearer address selection response, and sending a third call request carrying the private network address of the first user; receiving the returned a third call response corresponding to the third call request, where the third call response carries a private network address of the second user;

The step of returning the second call response corresponding to the second call request is specifically: returning a second call response carrying the private network address of the second user.

9. A method of determining a media stream path relationship according to any of claims 6-8, characterized in that

In the second call request, the first public network address and the private network address of the first user are placed in the set position order;

In the step of returning the second call response, the media transmission address of the second user is placed corresponding to the location of the media transmission address of the first user to which it matches in the second call request, The location corresponding to another address information in the second call request is set as an invalid address.

10. A method for determining a path relationship of a media stream, the method comprising:

Receiving a bearer address selection request, where the bearer address selection request carries a first public network address, a private network address of the first user, and a registered address of the second user; Determining whether the first user and the second user can directly communicate according to the private network address of the first user and the registered address of the second user;

Determining, by the determination result, a media transmission address of the first user, where the media transmission address of the first user is a first public network address or a private network address of the first user;

Returning a bearer address selection response corresponding to the bearer address selection request, the bearer address selection response carrying the media transmission address of the first user.

The method for determining a relationship of a media stream path according to claim 10, wherein when determining that the first user and the second user cannot directly communicate, the method further includes:

Obtaining a second public network address bound to the first public network address;

The returned bearer address selection response also carries the second public network address.

12. A method for determining a path relationship of a media stream, the method comprising:

Determining that the second user belongs to the session control function entity, and obtains a registration address of the second user;

Sending a bearer mode determining request, where the bearer mode determining request carries the private network address of the first user and the registered address of the second user;

And receiving, by the bearer mode determining response corresponding to the bearer mode determining request, the bearer mode determining response carries information indicating whether the first user and the second user can directly communicate;

Determining, according to the bearer mode, information indicating whether the first user and the second user can directly communicate, and determining that the first user and the second user can directly communicate;

Obtaining a private network address of the second user, and returning a first call response corresponding to the first call request, where the first call response carries a private network address of the second user.

13. A method for determining a relationship of a media stream path, the method comprising:

Receiving a bearer mode determining request, where the bearer mode determining request carries a private network address of the first user and a registered address of the second user;

Determining whether the first user and the second user can directly communicate according to the private network address of the first user and the registered address of the second user;

Returning a bearer mode judgment response corresponding to the bearer mode determination request, where the bearer mode is determined The broken response carries information corresponding to the judgment result.

14. A session control function entity, comprising:

a call receiving unit, configured to obtain a first call request of the first user to the second user, where the first call request carries a private network address of the first user;

a call connection unit, configured to send a second call request to the second user, where the second call request carries a private network address of the first user and a first public network address bound to the private network address of the first user And a response obtaining unit, configured to obtain a returned second call response corresponding to the second call request, where the second call response carries a media transmission address of the second user that matches the media transmission address of the first user, The media transmission address of the first user is the first public network address or the private network address of the first user, and the media transmission address of the second user is the second public network address or the private network address of the second user; a unit, configured to return, according to the media transmission address of the second user carried in the second call response, a first call response corresponding to the first call request, where the first call response carries the first user Destination address information for one hop.

The session control function entity according to claim 14, wherein the response processing unit comprises:

a determining unit, configured to determine, according to the media transmission address of the second user, that the first user and the second user are in direct communication or communicate through a public network address;

a public network unit, configured to: when the determining unit determines that the first user and the second user communicate by using a public network address, return a first call response corresponding to the first call request, where the first call response carries a first private network address bound to the private network address of the first user;

a private network unit, configured to: when the determining unit determines that the first user and the second user are in direct communication, return a first call response corresponding to the first call request, where the first call response carries the first The private network address of the second user.

The session control function entity according to claim 15, wherein the response processing unit further comprises:

The binding release unit is configured to release the first public network address bound to the private network address of the first user when the determining unit determines that the first user and the second user are in direct communication.

17. A call control system, comprising:

a tongue obtaining unit, configured to obtain a second call request to the second user, the second call request Carrying the first public network address and the private network address of the first user; and obtaining the registered address of the second user according to the second call request;

a policy decision unit, configured to determine whether the first user and the second user can directly communicate according to the private network address of the first user and the registration address of the second user, and determine a media transmission address of the first user according to the determination result. The media transmission address of the first user is a first public network address or a private network address of the first user;

An address obtaining unit, configured to obtain a media transmission address of the second user that matches the media transmission address of the first user;

a session response unit, configured to return a second call response corresponding to the second call request, where the second call response carries a media transmission address of the second user.

18. A session control function entity, comprising:

a connection obtaining unit, configured to obtain a second call request to the second user, where the second call request carries the first public network address and the private network address of the first user;

An address negotiation unit, configured to obtain a registration address of the second user according to the second call request, and send a bearer address selection request, where the bearer address selection request carries the first public network address and the first user The private network address and the registered address of the second user;

a negotiation obtaining unit, configured to obtain a returned bearer address selection response corresponding to the bearer address selection request, where the bearer address selection response carries a media transmission address of the first user, and the media transmission address of the first user is a public network address or a private network address of the first user;

An address matching unit, configured to obtain a media transmission address of the second user that matches the media transmission address of the first user;

And a connection response unit, configured to return a second call response corresponding to the second call request, where the second call response carries a media transmission address of the second user.

The session control function entity according to claim 18, wherein the address matching unit comprises:

a determining subunit, configured to determine, according to the media transmission address of the first user carried in the bearer address selection response, whether the first user and the second user can directly communicate;

a public network sub-unit, configured to obtain, when the determining sub-unit determines that the first user and the second user cannot directly communicate, obtain the second public network address as the media transmission address of the second user; The private network sub-unit is configured to obtain, when the determining sub-unit determines that the first user and the second user can directly communicate, obtain the private network address of the second user as the media transmission address of the second user.

20. A policy decision function entity, comprising:

a selection obtaining unit, configured to obtain a bearer address selection request, where the bearer address selection request carries a first public network address, a private network address of the first user, and a registered address of the second user;

An address selection unit, configured to determine whether the first user and the second user can directly communicate according to the private network address of the first user and the registration address of the second user, and determine a media transmission address of the first user according to the determination result, where The media transmission address of the first user is a first public network address or a private network address of the first user;

And a selection response unit, configured to return a bearer address selection response corresponding to the bearer address selection request, where the bearer address selection response carries the media transmission address of the first user.

The policy decision function entity according to claim 20, further comprising: a binding obtaining unit, configured to obtain, when the address selecting unit determines that the first user and the second user cannot directly communicate Describe a second public network address bound to the first public network address;

The bearer address selection response returned by the selection response unit further carries the second public network address.