Research On Controliing Users’ Bandwidth Dynamically Based On The Integrated Network Between Wlan And3G

As a wireless network access, WLAN has the following advantages: wide access bandwidth, low cost and high popularity rate of terminal. It also has disadvantages such as small coverage area, poor mobility.3G technologies have great advantages in coverage and mobility, but its bandwidth is limited. Therefore, WLAN technology and3G technology have complementary strengths; the combination of the two technologies is regarded as one of the inevitable development trends. However, at present, the WLAN users’load bandwidths are still controlled by static method, the bandwidth can’t be adjusted according to different users and network state information, thus fine bandwidth control cannot be achieved. Therefore, how to dynamically controll the WLAN users’ bandwidth is one of the key problems in the convergence process of WLAN and3G.In this thesis we proposed a solution to solve this problem. First, we build a WLAN and WCDMA integrated network testing environment which consist of5network element equiment:WLAN client, WLAN access points, WLAN broadband access server,3GPP AAA server and HLR. Then we test its authentication process and accounting process. Finally, based on deep research and analysis of these two processes, we proposed a solution to control WLAN users’bandwidth dynamically, which is mainly composed of user information acquisition module, scoring module, weight calculation module and queuing module. The functions of each module and coordinating work among them are as follows:firstly, the user information acquisition module obtains the5key indicators (user level, location of user, user’s accumulated flow, user’s accumulated used time, busy and free time of network) that impact the bandwidth, and then send these5indictators to the scoring module. Secondly, based on the comprehensive evaluation method of fuzzy math, the scoring module will get each indictator divided into5levels and score each indictator according to its level. And then weighting sum these5levels get a total score of the user, and send the total score to the next module. Thirdly, the user weight calculation module will calculate the user’s weight by taking into consideration the user’s score, the maximum rate and numbers of online users, and send the user’s weight to the next muduole. Finally, the user weight calculation module will send users’s data to different queues (senior queue, secondary queue, intermediate queue, and normal queue) by judging the users’weights. The general principle is that users with highest weight will go to the senior queue; the users with lowest weight will go to the normal queue. Therefore, bandwidth service differentiation between different usres is achevied.This thesis finally put up a multiple queue system under the environment of MATLAB. The simulation results show that the proposed dynamically control queuing system not only provided users with good service differentiation, but also has a better overall system performance compared with the existing queuing system.To sum up, some meaningful exploration and research about controlling bandwidth in WLAN and3G integrated network have done in this thesis, which has is meaningful in the promoting the integration process of WLAN and3G network.