长期演进(LTE,Long Term Evolution)是移动网络演进的下一代主流版本,将引领移动通信进入真正的宽带时代。相比现有的2G/3G网络,LTE产生了一些新的需求,从而导致其承载网解决方案相应发生较大变化。本文主要围绕LTE发展情况、对承载网...长期演进(LTE,Long Term Evolution)是移动网络演进的下一代主流版本,将引领移动通信进入真正的宽带时代。相比现有的2G/3G网络,LTE产生了一些新的需求,从而导致其承载网解决方案相应发生较大变化。本文主要围绕LTE发展情况、对承载网的要求以及承载解决方案等内容进行介绍,并在此基础上对目前几种主流的承载方案的优劣势进行了较详细的分析和比较。展开更多
Opportunistic routing(OR) is an effective way to guarantee transmission reliability in wireless multi-hop networks.However,little research focuses on transmission efficiency.Thus,an analytical model based on open queu...Opportunistic routing(OR) is an effective way to guarantee transmission reliability in wireless multi-hop networks.However,little research focuses on transmission efficiency.Thus,an analytical model based on open queuing network with Markov chains was proposed to evaluate the efficiency.By analyzing two typical ORs,we find duplicate transmission and collision avoidance overhead are the root reasons behind inefficiency.Therefore,a new scheme called dual priority cooperative opportunistic routing(DPCOR) was proposed.In DPCOR,forwarding candidates are configured with dual priority,which enables the network to classify forwarding candidates more effectively so as to reduce the back-off time and obtain more diversity gain.Theoretical analysis and simulation results show DPCOR achieves significant performance improvement with less time overhead compared with traditional routings and typical ORs.展开更多
文摘长期演进(LTE,Long Term Evolution)是移动网络演进的下一代主流版本,将引领移动通信进入真正的宽带时代。相比现有的2G/3G网络,LTE产生了一些新的需求,从而导致其承载网解决方案相应发生较大变化。本文主要围绕LTE发展情况、对承载网的要求以及承载解决方案等内容进行介绍,并在此基础上对目前几种主流的承载方案的优劣势进行了较详细的分析和比较。
基金supported by the National Science and Technology Major Projects under Grant No.2011ZX03001-007-03
文摘Opportunistic routing(OR) is an effective way to guarantee transmission reliability in wireless multi-hop networks.However,little research focuses on transmission efficiency.Thus,an analytical model based on open queuing network with Markov chains was proposed to evaluate the efficiency.By analyzing two typical ORs,we find duplicate transmission and collision avoidance overhead are the root reasons behind inefficiency.Therefore,a new scheme called dual priority cooperative opportunistic routing(DPCOR) was proposed.In DPCOR,forwarding candidates are configured with dual priority,which enables the network to classify forwarding candidates more effectively so as to reduce the back-off time and obtain more diversity gain.Theoretical analysis and simulation results show DPCOR achieves significant performance improvement with less time overhead compared with traditional routings and typical ORs.
