【作者】 陈琦；

【导师】 王雷；

【作者基本信息】 北京邮电大学 ， 通信与信息系统， 2013， 硕士

【摘要】 WLAN作为一种无线宽带接入方式,具有接入带宽高、成本低、终端普及率高等优势,但同时也具有覆盖范围小、移动性差等弱点；而3G技术在覆盖范围和移动性方面有很大的优势,但其带宽资源有限。因此,WLAN技术和3G技术可以很好地实现优势互补,二者的融合被很多运营商看作是无线数据业务发展的必然趋势之一。然而,目前与移动网络融合的WLAN用户承载带宽还处于传统的共享式分配阶段,无法依据不同的用户和网络状态等信息对用户承载带宽进行实时调整,无法实现精细化控制。因此,如何实现用户承载带宽的动态控制成为WLAN和3G融合过程中的关键问题之一针对这个问题,本论文实际搭建了一个由WLAN用户端、WLAN接入点、WLAN宽带接入服务器、核心网AAA服务器和用户归属寄存器等5个网元组成的WLAN与WCDMA融合网络的测试环境,并且对其统一认证过程和计费过程进行了测试。基于对这两个过程的深入研究和分析,提出了一整套较为完善的WLAN用户承载带宽动态控制方案。该方案主要由四个模块组成,分别是用户信息获取模块、用户评分模块、用户权重计算模块和队列调度控制模块。本论文对各个模块的功能以及它们之间协同工作的原理进行了详细设计与阐述：首先,用户信息获取模块通过统一认证和计费过程,完成对5个影响带宽的关键指标(用户级别、用户所在地、用户累计使用流量、用户累计使用时长、网络忙闲时间段)的获取,并将各指标下发给用户评分模块。其次,用户评分模块根据模糊综合评价的原则,对这5个指标进行量化评分。再根据各指标的重要性为每个指标分配不同的权重,将各指标评分及其权重进行加权求和得出用户的综合评分,并将该综合评分下发给用户权重计算模块。第三,用户权重计算模块,结合该用户的综合评分和网络所能提供的最大速率以及当前网络用户数,计算出用户数据包的调度权重,并将该调度权重下发给队列调度控制模块。最后,队列调度控制模块根据用户权重的大小将用户数据包分别划分入高级用户队列、次高级用户队列、中级用户队列和普通用户队列。总的原则是高级用户队列的调度权重值最高,而普通用户队列的调度权重值最低。从而在底层依据用户权重值的大小实现了对用户带宽的差异化服务。本论文通过MATLAB搭建了多队列系统,仿真结果表明,基于本论文所提动态控制方案的排队系统不仅能为用户提供了良好的差异化服务,而且该系统相比现有的无动态控制排队系统,在整体性能方面也有所提高。综上所述,本论文在(?)WLAN和3G融合网络的带宽控制方面做了一些有意义的探索和研究,提出了一套较为完整的WLAN用户承载动态带宽动态控制方案,并通过仿真验证了方案的可行性,对促进WLAN和3G网络的融合进程具有一定的意义。更多还原

【Abstract】 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.更多还原