Cross-grouping domain switching method, system and device based on IP multimedia subsystem

Abstract

The invention includes a method, system and device for switching across packet domain based on IP multimedia subsystem, the invention's application make that multi mode terminal do not need to register to IMS network integrallty once more after it switched to the switching target packet domain, and that the across packet domain switching rate for multimedia real-time session be improved effectively. And, in the process of switching, the flows of interaction signals between terminal and network do not need relating to the S-CSCF and SIP AS of IMS core network, which improve the switching efficiency of the multimedia real-time session.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method, system and equipment for handover across packet domains based on IP Multimedia Subsystem (IMS). Background technique [0002] As the core network network architecture for the future evolution of fixed and mobile convergence, the IMS Core network (IMS Core) needs to support sharing by multiple access technologies at the same time, and at the same time must ensure that end users are independent of fixed and mobile access. Unified continuity and multimedia service experience. [0003] With general packet radio service (GPRS, General Packet Radio Service), universal mobile communication system (UMTS, Universal Mobile Telecommunication System), code division multiple access (CDMA, Code Division Multiple Access), wireless fidelity (WiFi, Wireless Fidelity), With the vigorous rise and development of various types of wireless data access network technologies such as WiM...

AI Technical Summary

Problems solved by technology

[0026] 1) Since the 3GPP MSC is based on the continuation of the VCC scheme, therefore, before performing the SIP application layer switching operation, the UE needs to complete the IP network layer attachment and authentication process, and the UE needs to re-initiate the registration of the SIP application layer, Authentication is used to associate the IP address of the user on the target network with the public user identity (IMPU). At the same time, the CSCF also needs to complete the download of the IMS user subscription data from the HSS, resulting in a large delay in the handover signaling plane and reducing the service continuity of experience

[0027] 2) Refer to steps 8-22. It can be seen that under this scheme, all handover service flows need to pass through the P-CSCF and S-CSCF, and interact between the MSC AS and the terminal, which further increases the handover delay on the signaling plane

The triangular route formed between the home agent, home agent and foreign agent of the mobile node may increase transmission delay and affect real-time services such as audio and video

In addition, data packets are forwarded too many times in the network, which will waste network resources, increase network load, and have a negative impact on the implementation of multimedia services

[0040] 2) During the mobile IP registration switching process, the multi-mode terminal does not maintain the two media stream connections at the source side and the destination side at the same time during the process from switching source packet domain access network to switching target packet domain access network, and The home agent forwards data packets to the foreign agent through the tunnel, so that the continuity of the switched user plane media stream cannot be guaranteed. According to the actual measurement, the delay will reach up to 6-7 seconds, which cannot meet the requirements of real-time multimedia session switching. less than 200ms required

[0041] 3) If the mobile IP method is used, there are certain requirements for packet access aggregation nodes (such as GGSN, ASN-GW, etc.) and user terminals, and the deployment of HA is required. Network costs are also higher

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