Wireless Local Area Networks (WLAN) Web caching system and method

Abstract

The invention provides a WLAN Web caching system. The system comprises a cache controller and two or more than two Access Point (AP). The AP is used for receiving the requirement of the WLAN user for internet information to obtain a required object and send the object to the user; the cache controller is used for obtaining the requirement from the AP, obtains the required object or information about the required object position according to the global cache abstract and sends the information to the AP. The invention further provides a method based on the system. By means of the technical scheme, centralized control few in storage redundancy can be achieved, calculation and storage resources of the AP in the WLAN are fully used, the system obtains good extendibility, and effects of the system on the gateway stability are reduced.

Description

technical field [0001] The invention relates to the field of computer network transmission control, in particular, the invention relates to a wireless local area network (WLAN) network information cache (Web cache) system and method. Background technique [0002] Wireless Local Area Networks (WLAN) is a local area network that uses radio waves as a data transmission medium for connection. A simple WLAN consists of two types of devices: wireless workstation (Station, STA) and access point (Access Point, AP). STA is a terminal connected to a wireless network, that is, a user; AP is a device that provides wireless workstations with access to wired LANs and from wired LANs to wireless workstations. [0003] Network information cache (Web Cache, or Web cache) technology is based on the existing network architecture, using the transmission localization method to achieve the purpose of optimizing network bandwidth usage, improving network service quality, and enhancing network ava...

AI Technical Summary

Problems solved by technology

Since the proxy server needs to save a copy of the content requested by the user in its own cache, the cache storage capacity of the proxy server will directly restrict the scalability of the entire system, forming a performance bottleneck

At the same time, the proxy server needs to be deployed at the gateway, and its instability or even failure may affect the stability of the gateway and damage the network quality of the entire WLAN

If a proxy server is independently deployed on a single AP, such as figure 2 As shown, the effect of Web caching will be severely limited by the limited computing and storage resources of a single AP. At the same time, there will be a large amount of redundant cache content in WLAN APs, and the work efficiency of the entire system is not ideal.

If the proxy server is deployed distributedly on a large number of APs in the WLAN, such as image 3 As shown, if the APs use the inter-cache communication protocol (Internet Cache Protocol, ICP) to query each other's cache content in rounds, each AP can only cache with a limited number of neighbors, and the ICP message The number of will also increase sharply with the increase of the number of APs, which will affect the effect of the caching system and limit the scalability of the entire system.

If the cache object information content digest (Cache Digests) technology is used between APs, each AP needs to maintain the cache digests of all APs in the LAN, and each AP needs to perform many digest updates with all other APs in the LAN. And synchronization operations, which will bring a lot of additional storage and network overhead, affecting the efficiency and implementation of the cache system

[0005] Therefore, the existing web caching system deployment methods have disadvantages such as poor scalability and low effective resource utilization in WLAN scenarios with a large number of APs.

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