WO2009033379A1

WO2009033379A1 - A method and system for obtaining an address of the p-cscf

Info

Publication number: WO2009033379A1
Application number: PCT/CN2008/071134
Authority: WO
Inventors: Yangwei Tu; Yuzhen Huo
Original assignee: Zte Corporation
Priority date: 2007-09-13
Filing date: 2008-05-29
Publication date: 2009-03-19

Abstract

A method and system for obtaining an address of the P-CSCF are provided. The method includes the following steps: a terminal sends a DHCP informing message to an ASN-GW in a WiMAX network after the terminal has implemented the access and the authentication to the WiMAX network and obtained a local accessing IP address to the WiMAX network; then the ASN-GW sends a DHCP confirmation message which includes the address or domain name of the P-CSCF that presetted in the WiMAX network to the terminal. The terminal can get the address of the P-CSCF from the WiMAX network directly with the method and system provided by this invention. It also can make the existing message exchange process of getting the address of the P-CSCF easier, and takes less time but has higher system efficiency. Accordingly the aim of accessing the IMS network via the WiMAX network rapidly is achieved. Furthermore there's no need to extend the system message but there's high compatibility with the invention. And it's very easy to dispose and implement the invention with a little effect to the existing network.

Description

Method and system for obtaining proxy call session control function entity address

Technical field

The present invention relates to a technology for accessing an IP (Internet Protocol) multimedia network (IP) through the World Interoperability for Microwave Access (WiMAX) network, and particularly relates to A method and system for obtaining a proxy call session control function (P-CSCF) physical address when a WiMAX network accesses an IMS.

Background technique

WiMAX ^^-f" IEEE (Institute of Electrical and Electronics Engineers, IEEE 802.16 standard broadband wireless access technology, capable of effectively utilizing limited wireless spectrum resources to provide large air interface bandwidth, with the highest reach 70 Mbps data transmission capability. The WiMAX network reference model is shown in Figure 1. It consists of three logical entities: a registered terminal/mobile terminal (SS/MS), an access service network (ASN), and a connected service network (CSN); A logical entity represents a set of functional entities, each of which can be implemented entirely in a single physical device or distributed across multiple physical devices.

ASN mainly provides WiMAX users with corresponding radio access and control, and is composed of a base station (BS) and an access service network gateway (ASN-GW). The CSN provides an IP connection service for the MS, including the Authentication, Authorization, Accounting Server (AAA) and Home Agent (HA, Figure 1 not shown). The BS is connected to the SS/MS through the R1 interface, and the SS/MS is connected to the CSN through the R2 interface. The ASN-GW is connected to the CSN through the R3 interface, and the ASN is connected to other ASNs through the R4 interface. The CSN is connected to other CSNs through the R5 interface. In Fig. 1, the solid line represents the bearing surface and the broken line represents the control surface.

WiMAX networks require mobile IP (MIP) as a mobility management protocol. Within the Mobile IP framework, Mobile IP clients maintain a fixed home IP address between different foreign agents (FAs). The Mobile IP protocol provides IP routing services for mobile users to public IP networks. The mobility management of WiMAX networks supports two different MIPs: Client Mobile IP (CMIP) and Proxy Mobile IP (PMIP). The Dynamic Host Configuration Protocol Agent (DHCP Proxy) acts as a functional entity of the ASN-GW and provides DHCP proxy functionality for mobile IP terminals.

The DNS server (not shown in Figure 1) is deployed by the carrier and is responsible for maintaining the binding between the domain name and the IP address.

The Home Authentication, Authorization, and Accounting Function (HAAA) entity acts as a functional entity of the home network CSN, providing user data to authenticate, authorize, and charge users.

Because the WiMAX connection service network only provides the IP layer connection, does not define the service control function, and cannot provide controllable telecommunication services, it needs to be integrated with other mature networks. IMS is the preferred network architecture for next-generation IP services. It is the overall architecture of the future development network. Its architecture enhances the controllability and manageability of IP-based flows and represents the future development trend of the network. Therefore, WiMAX access will constitute an important IP access network for the IMS network, which can effectively compensate for the limited bandwidth of other wireless access technologies.

ASN-GW is a gateway device that provides users with wireless access. At the same time, in the simple IP framework, it is also the exit point for WiMAX systems to connect with the Internet or other systems.

The P-CSCF is the initial entry point for the user to access the IMS network, and can select the user's home network. Therefore, when the user needs to access the IMS through the WiMAX system, the address of the P-CSCF needs to be obtained first.

In the existing technology of accessing IMS through the WiMAX network, there is no P-CSCF address of the IMS in the WiMAX network. When the SS/MS needs to access the IMS through the WiMAX network, the PSN address is obtained from the WiMAX network through the ASN-GW. Because the message interaction process for obtaining the P-CSCF address is very cumbersome, and the message in the existing standard needs to be expanded, the existing scheme for obtaining the P-CSCF address takes a long time and the system efficiency is low.

Summary of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a method for directly acquiring a P-CSCF address from within a WiMAX network to improve system efficiency.

In order to solve the above problem, the present invention provides a method for obtaining an agent call session control function entity address, the method comprising the following steps: A: After completing the access authentication of the WiMAX network and obtaining the local access IP address of the WiMAX network, the terminal sends a DHCP notification message to the ASN-GW in the WiMAX network;

B: The ASN-GW sends the address or domain name of the pre-configured P-CSCF in the WiMAX network to the terminal in the corresponding DHCP confirmation message.

Further, the address or domain name of the P-CSCF is pre-configured in the ASN-GW as a DHCP proxy.

In addition, the address or domain name of the P-CSCF is pre-configured in the HAAA of the WiMAX network. Before the terminal sends the DHCP notification message, the terminal further includes the following steps:

In the access authentication process of the terminal, the HAAA will use the pre-configured P-CSCF

In addition, an address of the DNS server is also pre-configured in the ASN-GW;

In step B, the ASN-GW sends the domain name of the P-CSCF and the address of the DNS server in the DHCP confirmation message to the terminal.

After the step B, the method further includes the following steps: The terminal obtains the address of the P-CSCF through a DNS query according to the received domain name of the P-CSCF and the address of the DNS server.

In addition, the address of the DNS server is also pre-configured in the HAAA;

In the access authentication process of the terminal, the HAAA also distributes the address of the DNS server to the ASN-GW together with the domain name of the P-CSCF;

In step B, the ASN-GW sends the received domain name of the P-CSCF and the address of the DNS server to the terminal in the DHCP confirmation message.

After the step B, the terminal obtains the address of the P-CSCF through a DNS query according to the received domain name of the P-CSCF and the address of the DNS server.

The present invention further provides a system for obtaining an address of a proxy call session control function entity, which is divided into a terminal side and a WiMAX network side; the WiMAX network side includes an ASN-GW, and the ASN-GW includes a DHCP proxy; A P-CSCF address requesting unit is included, where the DHCP proxy includes a P-CSCF address sending unit, and the WiMAX network side further includes a storage unit; The storage unit is configured to store an address or a domain name of a P-CSCF that is preset, a notification message, and receive an address or a domain name of the P-CSCF returned by the P-CSCF address sending unit, where the P-CSCF address sending unit is used. Obtaining an address or a domain name of the P-CSCF stored in the storage unit, and including it in a DHCP confirmation message, returning to the P-CSCF address requesting unit.

Further, the storage unit is disposed in a DHCP proxy of the ASN-GW.

In addition, the storage unit is disposed in the HAAA of the WiMAX network;

The P-CSCF address sending unit acquires an address or a domain name of the P-CSCF from the storage unit set in the HAAA in an access authentication process of the terminal.

Further, the storage unit in the DHCP agent of the ASN-GW is further configured to store an address of the pre-configured DNS server; and include it in the DHCP confirmation message and send the address to the P-CSCF address. Request unit

The terminal side further includes a DNS query unit, configured to obtain an address of the corresponding P-CSCF entity by using a DNS query according to the domain name of the P-CSCF entity and the address of the DNS server obtained by the P-CSCF address requesting unit.

In addition, the address of the pre-configured DNS server is also stored in the storage unit in the HAAA;

The P-CSCF address sending unit is further configured to acquire an address of the DNS server from the storage unit set in the HAAA in an access authentication process of the terminal, and include the Sending to the P-CSCF address request unit in the DHCP confirmation message;

The terminal side further includes a DNS query unit, configured to obtain an address of the corresponding P-CSCF entity by using a DNS query according to the domain name of the P-CSCF entity and the address of the DNS server acquired by the P-CSCF address requesting unit. 1'J +— WiMA l»JA -LrW ψ曰iJMU^ Wl丄'

The other network element (such as HAAA) configures the address of the P-CSCF entity, or the domain name of the P-CSCF entity and the address of the DNS, so that the terminal can directly obtain the address of the P-CSCF entity from the WiMAX network, simplifying the existing Obtaining the message exchange process of the P-CSCF address, the time is short, and the system efficiency is high, so as to achieve the purpose of quickly accessing the IMS network through the WiMAX network.

In addition, the present invention saves the address of the P-CSCF entity, or the domain name of the P-CSCF entity, and the address of the DNS server in the DHCP proxy of the ASN-GW, so that the terminal can directly obtain the address of the P-CSCF entity by using the DHCP procedure or Obtain the domain name and DNS address of the P-CSCF entity, do not need to extend the system message, have high compatibility, have little impact on the existing network, and are very easy to deploy and implement.

BRIEF abstract

Figure 1 is a schematic diagram of a WiMAX network architecture reference model;

2 is a flowchart of a method for obtaining a P-CSCF address configured in a DHCP proxy of an ASN-GW according to a first embodiment of the present invention;

3 is a flow chart of a method for obtaining a P-CSCF address configured in HAAA according to the first embodiment of the present invention;

4 is a schematic structural diagram of a system for obtaining a P-CSCF physical address according to a first embodiment of the present invention; FIG. 5 is a second embodiment of the present invention for obtaining a P-CSCF domain name and a DNS server address configured in a DHCP proxy of an ASN-GW. A flowchart of a method for obtaining a P-CSCF address;

6 is a flowchart of a method for obtaining a P-CSCF address by acquiring a domain name and a DNS server address of a P-CSCF entity configured in HAAA according to a second embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a system for acquiring a physical address of a P-CSCF according to a second embodiment of the present invention.

Preferred embodiment of the invention

In order to obtain the address of the IMS access point P-CSCF entity from the ASN-GW of the WiMAX network, the address of the P-CSCF entity may be configured on the DHCP proxy in the ASN-GW (which may also use the ASN-GW as a DHCP proxy) or Configure the domain name of the P-CSCF entity and the address of the DNS server. The address of the P-CSCF entity or the domain name of the P-CSCF entity and the address of the DNS server may also be obtained from other network elements, such as a Home Authentication, Authorization, and Accounting Function (HAAA) entity.

After obtaining the local access IP address in the WiMAX network, the MS/SS (collectively referred to as the terminal) initiates a DHCP query, obtains the address of the P-CSCF entity from the DHCP proxy, or obtains the domain name of the P-CSCF entity and the address of the DNS server. . If the domain name of the P-CSCF entity is obtained, the MS/SS queries the DNS for the address of the P-CSCF according to the domain name of the P-CSCF entity.

A first embodiment of the present invention will be described below with reference to Figs. 2, 3 and 4.

2 is a flowchart of a method for obtaining a P-CSCF address configured in a DHCP proxy of an ASN-GW according to a first embodiment of the present invention; in this embodiment, when an MS/SS completes access authentication of a WiMAX network (also referred to as a connection) After entering the authentication process and obtaining the local access IP address in the WiMAX network, the DHCP process is initiated to obtain the address of the P-CSCF entity configured in the DHCP proxy. As shown in Figure 2, the method includes the following steps:

Step S201: The MS/SS sends a DHCP notification message to the DHCP proxy to request to obtain an address of the P-CSCF entity.

Step S202: The DHCP proxy returns the address of the P-CSCF entity in the DHCP confirmation message and returns it to the MS/SS.

FIG. 3 is a flowchart of a method for obtaining a P-CSCF address configured in HAAA according to the first embodiment of the present invention; in this embodiment, in the process of performing WiMAX network access authentication by the MS/SS, the HAAA will be a P-CSCF entity. The address is distributed to the DHCP proxy on the ASN-GW. The DHCP proxy stores the address of the P-CSCF entity obtained from the HAAA. The MS/SS initiates the DHCP procedure to obtain the P-CSCF entity address in the same manner as in FIG. 2.

4 is a schematic structural diagram of a system for acquiring a physical address of a P-CSCF according to a first embodiment of the present invention. As shown in FIG. 4, the system includes: a terminal side and a WiMAX network side; a terminal side includes a P-CSCF address requesting unit 402; a WiMAX network side includes an ASN-GW, and the ASN-GW includes a DHCP proxy, and the DHCP proxy includes a P- CSCF address sending unit 403; WiMAX network side also includes Storage unit 401; wherein:

The storage unit 401 may be disposed in a DHCP proxy of the ASN-GW or another network element of the WiMAX network, such as HAAA, for storing an address of the P-CSCF entity; the address of the P-CSCF entity may be statically configured therein;

The P-CSCF address requesting unit 402 on the terminal side is configured to send a DHCP notification message to the P-CSCF address sending unit 403 on the DHCP proxy, requesting to acquire an address of the P-CSCF entity;

The P-CSCF address sending unit 403 on the DHCP proxy is configured to obtain the address of the P-CSCF entity held by the storage unit 401, and include the address in the DHCP confirmation message and return it to the P-CSCF address requesting unit 402 on the terminal side. .

Next, a second embodiment of the present invention will be described with reference to Figs. 5, 6 and 7.

FIG. 5 is a flowchart of a method for obtaining a P-CSCF address by acquiring a P-CSCF domain name and a DNS server address configured in a DHCP proxy of the ASN-GW according to the second embodiment of the present invention. In this embodiment, after the MS/SS completes the access authentication of the WiMAX network and obtains the local access IP address in the WiMAX network, the DHCP process is initiated to obtain the address of the P-CSCF entity. As shown in FIG. 5, the method includes the following steps:

Step S501: The MS/SS sends a DHCP notification message to the DHCP proxy to request to obtain an address of the P-CSCF entity.

Step S502, the DHCP proxy includes the domain name of the P-CSCF entity and the address of the DNS server in the DHCP confirmation message, and returns the message to the MS/SS.

Step S503: The MS/SS obtains an address of the P-CSCF entity corresponding to the domain name of the P-CSCF entity by sending a DNS query message to the DNS server.

FIG. 6 is a flowchart of a method for obtaining a P-CSCF address by acquiring a domain name and a DNS server address of a P-CSCF entity configured in HAAA according to a second embodiment of the present invention. In this embodiment, in the process of performing WiMAX network access authentication by the MS/SS, the HAAA distributes the domain name of the P-CSCF entity and the address of the DNS server to the DHCP proxy on the ASN-GW; the DHCP proxy stores the obtained from the HAAA. After the domain name of the P-CSCF entity and the address of the DNS server, the MS/SS initiates DHCP. The process of obtaining the domain name of the P-CSCF entity and the address of the DNS server, and obtaining the P-CSCF entity address through the DNS query is the same as that of FIG. 5.

FIG. 7 is a schematic structural diagram of a system for acquiring a physical address of a P-CSCF according to a second embodiment of the present invention. As shown in Figure 7, the system includes: a terminal side and a WiMAX network side. The terminal side includes: a P-CSCF address requesting unit 702, a DNS query unit 704; a WiMAX network side including an ASN-GW, an ASN-GW including a DHCP proxy, a DHCP proxy including a P-CSCF address sending unit 703; and a WiMAX network side including Storage unit 701; wherein:

The storage unit 701 is disposed in a DHCP proxy of the ASN-GW, or other network element in the WiMAX network, such as HAAA, for storing the domain name of the P-CSCF entity and the address of the DNS server; the domain name of the P-CSCF entity and the DNS server The address can be statically configured in it;

The P-CSCF address requesting unit 702 on the terminal side is configured to send a DHCP notification message to the P-CSCF address sending unit 703 on the DHCP proxy, requesting to acquire the domain name of the P-CSCF entity and the address of the DNS server;

The P-CSCF address sending unit 703 in the DHCP proxy is configured to acquire the domain name of the P-CSCF entity and the address of the DNS server held by the storage unit 701, and include the P-CSCF in the DHCP confirmation message and return it to the P-CSCF on the terminal side. Address request unit 702.

The DNS query unit 704 on the terminal side is configured to obtain the address of the corresponding P-CSCF entity through a DNS query according to the domain name of the P-CSCF entity and the address of the DNS server acquired by the P-CSCF address requesting unit 702.

According to the basic principle of the present invention, the above embodiment has various transformations, such as:

(1) In addition to ASN-GW and HAAA, the address of the P-CSCF entity or the domain name of the P-CSCF entity and the address of the domain name server may be configured on other network elements in the WiMAX network; (2) The P-CSCF entity The domain name and the address of the DNS server can be pre-configured on different NEs. For example, the DNS server address can be configured in the ASN-GW. The domain name of the P-CSCF entity is configured in the HAAA.

Claims

Claim

A method for obtaining an agent call session control function entity address, the method comprising the steps of:

A: After completing the access authentication of the WiMAX network and obtaining the local access IP address of the WiMAX network, the terminal sends a DHCP notification message to the ASN-GW in the WiMAX network;

2. The method of claim 1 wherein:

The address or domain name of the P-CSCF is pre-configured in the ASN-GW as a DHCP proxy.

3. The method of claim 1 wherein:

The address or the domain name of the P-CSCF is pre-configured in the HAAA of the WiMAX network. Before the terminal sends the DHCP notification message, the terminal further includes the following steps:

4. The method of claim 2, wherein

The address of the DNS server is also pre-configured in the ASN-GW;

5. The method of claim 3, wherein

The address of the DNS server is also pre-configured in the HAAA;

In step B, the ASN-GW receives the domain name of the P-CSCF, and the The address of the DNS server is sent to the terminal in the DHCP confirmation message;

A system for obtaining a proxy call session control function entity address, which is divided into a terminal side and a WiMAX network side; the WiMAX network side includes an ASN-GW, and the ASN-GW includes a DHCP proxy; The terminal side includes a P-CSCF address requesting unit, the DHCP proxy includes a P-CSCF address sending unit, and the WiMAX network side further includes a storage unit;

The storage unit is configured to store an address or a domain name of a P-CSCF that is preset, a notification message, and receive an address or a domain name of the P-CSCF returned by the P-CSCF address sending unit, where the P-CSCF address sending unit is used. Obtaining an address or a domain name of the P-CSCF stored in the storage unit, and including it in a DHCP confirmation message, returning to the P-CSCF address requesting unit.

7. The system of claim 6 wherein:

The storage unit is disposed in a DHCP proxy of the ASN-GW.

8. The system of claim 6 wherein:

The storage unit is disposed in the HAAA of the WiMAX network;

9. The system of claim 7 wherein:

And storing, in the storage unit in the DHCP proxy of the ASN-GW, an address of the pre-configured DNS server; and including the address in the DHCP confirmation message and sending the request to the P-CSCF address request unit;

The terminal side further includes a DNS query unit, configured to request a unit according to the P-CSCF address Obtain the domain name of the P-CSCF entity and the address of the DNS server, and obtain the address of the corresponding P-CSCF entity through DNS query.

10. The system of claim 8 wherein:

And storing, in the storage unit in the HAAA, an address of the pre-configured DNS server;