A network switching method with zero packet loss for mobile terminals under a new routing system

Abstract

The invention discloses a network switching method achieving zero packet loss of a mobile terminal under a novel routing system. When the mobile terminal detects that service quality is decreased to a certain threshold value during movement, the mobile terminal scans peripheral access point networks to obtain the optimal access point NAR, and obtains a new Eloc address through negotiation between a PAR and the NAR, after switching is confirmed, the PAR forwards a data packet making a terminal Eloc as a destination address to the NAR for caching, then the terminal informs a communication opposite terminal and a home EMS server of the new Eloc address to update mapping tables (ID and Eloc) respectively stored in the communication opposite terminal and the home EMS server, the cached data packet is taken back after the mobile terminal is switched to the new Eloc address, and normal communication between the mobile terminal and the communication opposite terminal is recovered. According to the network switching method, the Eloc address of a network to be accessed is obtained in advance, switching delay is avoided, the NAR caches the data packet before switching of the terminal to achieve zero packet loss, and normal operation of communication is guaranteed.

Description

technical field [0001] The invention relates to wireless access technology, in particular to a network switching method with zero packet loss for mobile terminals under a novel routing system. Background technique [0002] The Internet was originally designed to serve fixed terminals, and essentially does not support mobile terminals. The IP address of the Internet has dual identification of identity and location: as an identification, the IP address is used to represent the identity of the host in the network, and the high-level protocol usually binds the IP address as an identifier to the application; as a location identification, the IP address It is used in routing systems to determine the path of packet forwarding. [0003] With the development of communication technology, more and more mobile terminals can support Internet applications. When users move from one subnet to another, their IP addresses will change, and the location identifier will change. If the identity...

AI Technical Summary

Problems solved by technology

[0017] Although this new routing system solves the problem of double identification of IP addresses and can support the mobility of terminals, when a terminal moves from one subnet to another, it needs to disconnect from the current access router PAR. When connecting with a newly accessed router NAR, it takes a certain amount of time to dynamically obtain a new Eloc address, and during this period, communication will be interrupted

To avoid the problem of communication interruption, the data packets sent to the terminal during terminal switching can be temporarily buffered by the router, and the data packets will be retrieved after the terminal switching is completed, but the timing of terminal switching is difficult to grasp. Too early will cause data packet loss and cause communication interruption, while switching too late will need to buffer a large number of data packets, which will additionally increase the cost of the router

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