Wireless isomer network vertical switch control method based on conversation edge control equipment SBC

Abstract

The invention relates to the mobile communication field, in particular to a method for controlling the vertical switch of a wireless heterogeneous network based on a session border controller (SBC) in an application layer mobility management technology. The method aims at the application of a multi-model mobile terminal in the multimedia services of the heterogeneous network, the SBC is utilized as a fixed mobile anchor point, an SIP protocol is adopted as a mobility management protocol, then the rapid vertical switch of the multimedia services of the multi-model mobile terminal among wireless heterogeneous networks such as GSM, WLAN and 3G, etc. is realized by the alternation of standardized and extended SIP signaling between two SIP function entities, namely, mobility management client terminal disposed in the multi-model terminal and the mobility management server disposed in session boarder controller, thereby reducing micro-mobile vertical switch delay and packet loss rate.

Description

technical field [0001] The invention belongs to the field of mobile communication, relates to application layer mobility management, in particular to a wireless heterogeneous network vertical switching control method based on a border session control device (SBC) in multi-mode mobile terminal multimedia services. Background technique [0002] With the rapid development of communication technology and the continuous innovation of wireless access technology, the access methods of the next generation wireless network are more abundant, the deployment and planning of network convergence are more complex, and various wireless access ends and standards coexist, complementing each other to form an organic As a whole, they jointly provide users with ubiquitous and ubiquitous information and communication services. Therefore, the mobility management technology has also undergone profound changes. It should support the mobility of users across heterogeneous access networks, different ...

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Problems solved by technology

[0004] 2. The vertical handover decision factor is not limited to the physical signal strength (RSS, Received Signal Strength) received by the terminal, because the network characteristics before and after the handover are very different, and the RSS indicators between the networks are not comparable

[0006]4. Vertical handover involves a variety of heterogeneous link layer access technologies, which should be independent of the underlying access technology, while the link conversion of horizontal handover is often Link layer implementation is limited to a single wireless access technology, which cannot adapt to future multi-mode terminal mobility scenarios and effectively support handover between heterogeneous wireless networks. Therefore, high-level mobility management based on mobile IP, SIP and other protocols has become the general trend in the future

[0009]2. Since the mobile switching center MSC and base stations in the cellular network do not support high-level mobility, high-level vertical handover solutions such as mobile IP and SIP protocols need to be introduced into the hometown Agents, external agents and other new mobility management network elements, it is difficult to make full use of the existing telecommunications infrastructure to achieve smooth transition, and lack of vertical handover management mechanism for multi-mode terminals

[0010]3. Today's high-level vertical handover schemes have some defects. For example, mobile IP and SIP protocols have relatively large handover delays and high packet loss rates. Seriously affect the vertical switching performance, which is intolerable for UDP real-time multimedia services that are sensitive to delay and require high quality of service (QoS)

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