Method for accessing a wireless local area network and communication system

Abstract

The invention discloses a method for accessing a wireless local area network, which comprises the steps as follows: an access point (AP) to be accessed into the wireless local area network sends the communication identification thereof in an external network at a media access control (MAC) layer; according to the communication identification sent by the AP, a subscriber station is communicated with the AP by taking the currently belonged center node as an intermediate station, and exchanges and accesses signaling relative to the wireless local area network; and the subscriber station and the AP exchange information in the wireless local area network, thereby realizing the wireless local area network accessing. The invention further discloses a communication system. Through the invention, the authentication is not required before the subscriber station is accessed into the AP of a new wireless local area network, the access time delay is saved, and the rapid access is realized.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method and a communication system for accessing a wireless local area network. Background technique [0002] Wireless LAN is a wireless access technology that provides users with high-speed services (802.11n wireless LAN can provide a data rate of up to 600 Mbit / s) within a small coverage area (typical coverage radius is less than 100 meters). There are two main types of current WLAN technologies: 802.11 WLAN proposed by IEEE and HiperLAN / 2 WLAN proposed by ETSI. Among them, 802.11 WLAN has been widely used. [0003] When WLAN was first proposed, it mainly focused on how to realize low-cost high-speed services by adopting new physical layer and MAC layer technologies, and paid less attention to network interconnection. Today, with the increasingly widespread deployment of wireless local area networks and the broad commercial prospects of heterogeneous integration of wirel...

AI Technical Summary

Problems solved by technology

There are two problems in this solution: (1) The conversion of this wireless LAN is realized by transmitting information at the MAC layer, so it is necessary to implement a kind of management between the access points APs of the wireless LAN to make an AP Finding another AP based on the above-mentioned MAC layer transmission information requires a lot of overhead for this management; (2) Since the information of the network layer or above the network layer is not used, the user station enters another wireless LAN from one wireless LAN It is not possible to switch the current business (handover)

[0005] For the realization of access management and handover between wireless local area network and cellular network (or wireless metropolitan area network), the existing technology can only be based on the existing method of user station access in wireless local area network, through this basis Appropriate supplementary steps are added to realize the low efficiency and long delay of user sites accessing WLAN

This is because: in the application of public places, when the user station accesses the WLAN, in order to protect the network from hacker attacks and ensure its security, the AP needs to perform strict authentication on the user station before agreeing to its access. Authentication may be realized through multiple signaling interactions between the AP, the user site, and the user information server in the Internet (or cellular network core network), which will face a large access delay

In addition, in a wireless LAN (such as 802.11 wireless LAN) that implements MAC access based on competition, if there are a large number of working stations, it will take a long time for the user stations to be accessed to achieve MAC access once. This means that each signaling interaction between the user station and the AP also takes a long time, which will greatly increase the time for user authentication

In the case of a large access delay, when a user station that is transmitting services enters the current WLAN from another WLAN or other network, switching the service to the WLAN will face a large handover Delay, it is difficult to guarantee the QoS performance for real-time services, and it will also affect user experience for online services

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