ISSN: 1673-825X    Imprint: Chongqing University of Posts and Telecommunications Journal
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异构网络垂直切换性能参数分析及算法研究
Performance parameter analysis and algorithm study of vertical handoff for heterogeneous networks
DOI:10.3979/j.issn.1673-825X.2010.01.015
Received:June 04, 2009  
中文关键词:异构网络  垂直切换  网络选择  代价函数  优化理论  权值可变
英文关键词:heterogeneous network  vertical handoff  network selection  cost function  optimization function  variable weights
基金项目:重庆市科委自然基金项目(CSTC2009BB2083);重庆邮电大学博士启动基金;新世纪优秀人才支持计划(NCET-06-0778);国际科技合作项目(2008DFA12110)
Author NameAffiliation
CHAI Rong, XIAO Min, TANG Lun, CHEN Qian-bin College of Communication and Information Engineering, Chongqing University of Posts and Telecommunications,Chongqing 400065, P. R. China 
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中文摘要:
      以蜂窝网与无线局域网(WLAN)融合为例,研究异构网络之间的垂直切换算法。对影响切换算法性能的各网络端及用户端参数进行了分析研究,包括参数的定义、在不同接入网中的取值范围、参数之间的关系及参数的归一化等。针对参数对切换算法及系统性能的影响,进行了参数分类,将参数分为切换先决条件、切换判决条件及切换辅助条件,并根据参数分类提出了新的垂直切换算法。该算法采用可变权值,即算法中各性能参数的权值依据用户业务特性,移动模型及用户对各网络的喜好等因素进行动态调整。与目前固定权值的垂直切换算法相比,提出的算法考虑了不同用户特性及QoS需求,可提高用户满意度及网络整体性能。
英文摘要:
      In this paper, vertical handoff algorithm for heterogeneous network was studied through the integration between cellular network and wireless local area network (WLAN). The network-end and user-end parameters affecting algorithm performance were analyzed in detail, including the parameter definition, the range of parameters in different access networks, the relations between different parameters and the normalization problem. According to the parameter effects on handoff algorithm and system performance, these parameters were categorized as handoff conditional parameters, handoff decision parameters and handoff assistance parameters. Based on the parameter classification, a new weight variable handoff algorithm was proposed. This algorithm adopts the weights that are adaptive to the characteristics of user traffic, user mobility model and user preference to access networks. Compared with existing vertical handoff algorithms with fixed weights, this novel algorithm takes into account user characteristics and QoS requirements, and it is able to improve user satisfaction level and system performance.
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