WLAN/LTE异构网络中网络选择优化算法

目前，配有多种无线接入技术的多模终端变得越来越流行，与此同时，网络运营商和服务提供商利用各种技术，力争在为用户提供无缝服务的同时，使其成本最低。为了使复杂环境下的操作标准化，3GPP目前正致力于研究IP流的移动性和移动数据卸载的解决方案。本文提出了一种在WLAN/LTE异构网络环境下接入网络选择的优化方案。方案不仅考虑了移动节点中的可用参数和它当前所关联的网络及备选网络，还对异构网络的整体性能进行了优化。文章介绍了一种基于著名的装箱问题近似解的优化模型和分布式处理信号的方案。最后用模拟器对方案进行了验证，结果表明，相比只根据本地可有信息来进行切换，上述解决方案对网络的性能有明显改善。

Optimization Algorithm of Network Selection in a WLAN/LTE Heterogeneous Network Environment

MultiMode terminals are becoming increasingly popular. At the same time, network operator and service providers use technologies to deliver seamless services cost effectively. In order to standardize the operations of such complex environments 3GPP is currently working on IP flow mobility and mobile data offload solutions.This article proposes and evaluates a new access network selection procedure in such a combined WLAN/LTE environment. The proposed solution takes not only parameters available in the mobile node and its current and candidate access networks into account, but performs an optimization on the heterogeneous wireless network level as well. An optimization model based on an approximate solution to the wellknown bin packing problem is presented. Also, there is a signaling scheme for distribution handling presented. Results from simulations performed in Modeler show improvements compared to basing handover decisions on locally available information only.