A method for redirecting packet data gateway in wireless LAN

Abstract

The present invention provides a method of redirecting packet data gateway (PDG) in wireless local area network. Using the present invention, when user terminal fails to access the PDG, the PDG which has received the application of user terminal return failure message including IP address of PDG which can provide service for application user to user terminal. After receiving the message , the user terminal performs redirection using the IP address which the message provided, requests establishing tunnel link to new PDG Thus , user terminal can directly redirect to PDG which can provide service, avoiding the process that user terminal accesses DNS and redirects to home network to select PDG At the same time , user terminal can definitely know which PDG can provide service with present invention, therefore reducing the number of connecting failure , and optimizing the utilization of network source.

Description

technical field [0001] The invention relates to the technical field of wireless access, in particular to a method for redirecting a packet data gateway (PDG) in a wireless local area network. Background technique [0002] With the development of society, users have higher and higher requirements on the wireless access rate. Since a wireless local area network (WLAN, Wireless Local Area Network) can provide high-speed wireless data access in a small area, it is widely used. Wireless local area network includes a variety of different technologies. A technical standard that is widely used at present is IEEE 802.11b, which uses the 2.4GHz frequency band, and the maximum data transmission rate can reach 11Mbps. IEEE 802.11g and Bluetooth (Bluetooth) technology are also used in this frequency band. , Among them, the highest data transmission rate of 802.11g can reach 54Mbps. Other wireless LAN technologies, such as IEEE 802.11a and ETSI BRAN Hiperlan2, use the 5GHz frequency band...

AI Technical Summary

Problems solved by technology

[0013] The defect of the above method is that when a WLAN terminal user wants to use a certain PGD in the access network in the roaming state, if the PDG notifies the WLAN user terminal of failure, the WLAN user terminal will contact the DNS again to resolve the PDG of the home network where the service is to be accessed. IP address

In this case, the WLAN user terminal needs to contact the DNS again, which causes unnecessary waste of signaling resources and makes resource usage unoptimized.

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