A new integrated energy-saving scheme in green Fiber-Wireless(FiWi) access network  

作　　者：LIU YeJun GUO Lei ZHANG LinCong YANG JiangZi 

机构地区：[1]College of Information Science and Engineering,Northeastern University

出　　处：《Science China(Information Sciences)》2014年第6期70-84,共15页中国科学（信息科学）（英文版）

基　　金：supported in part by the National Natural Science Foundation of China (Grant Nos. 61172051,61071124);the Fok Ying Tung Education Foundation (Grant No. 121065);the Program for New Century Excellent Talents in University (Grant Nos. 11-0075,12-0102);the Fundamental Research Funds for the Central Universities (Grant Nos. N110604008,N110204001);the Specialized Research Fund for the Doctoral Program of Higher Education (Grant Nos. 20110042110023,20110042120035,20120042120049)

摘　　要：Energy savings in Internet have been regarded as a significant technical issue for academic and industrial community.Particularly,access network accounts for more than 70%of the total energy consumption of Internet.As a promising access technique,Fiber-Wireless（FiWi）network not only enables the cost-effective broadband access,but also provides more opportunities for energy savings.Previous works mostly focused on the energy savings in the optical back-end of FiWi.Generally,they extended the Optical Network Unit（ONU）sleep mechanisms initially designed for Passive Optical Network（PON）to FiWi by combining with the wireless rerouting.However,most of these works left the energy savings in the wireless front-end untouched.In fact,when one or more ONUs in the network is/are sleeping,many wireless components remain idle or underutilized which cause a lot of energy waste.Motivated by this,we propose a new integrated Wireless-Optical Energy Savings（WOES）scheme for the comprehensive energy savings in FiWi.The WOES scheme consists of two interactive modules,Energy-Efficient ONU Management（EEOM）and Energy-Aware Topology Configuration（EATC）.EEOM aims at the energy savings in the optical back-end by putting the low-load ONUs into sleep state.A pair of thresholds is introduced into EEOM to maintain the states of ONUs.As soon as ONUs states change,EATC will reconfigure the wireless topology by putting the idle Radio Interfaces（RIs）into standby state,thus minimizing the energy consumption of the wireless front-end.Simulation results show that the WOES scheme can reduce the energy consumption significantly with just a little performance degradation in network throughput and end-to-end delay.Energy savings in Internet have been regarded as a significant technical issue for academic and industrial community.Particularly,access network accounts for more than 70%of the total energy consumption of Internet.As a promising access technique,Fiber-Wireless（FiWi）network not only enables the cost-effective broadband access,but also provides more opportunities for energy savings.Previous works mostly focused on the energy savings in the optical back-end of FiWi.Generally,they extended the Optical Network Unit（ONU）sleep mechanisms initially designed for Passive Optical Network（PON）to FiWi by combining with the wireless rerouting.However,most of these works left the energy savings in the wireless front-end untouched.In fact,when one or more ONUs in the network is/are sleeping,many wireless components remain idle or underutilized which cause a lot of energy waste.Motivated by this,we propose a new integrated Wireless-Optical Energy Savings（WOES）scheme for the comprehensive energy savings in FiWi.The WOES scheme consists of two interactive modules,Energy-Efficient ONU Management（EEOM）and Energy-Aware Topology Configuration（EATC）.EEOM aims at the energy savings in the optical back-end by putting the low-load ONUs into sleep state.A pair of thresholds is introduced into EEOM to maintain the states of ONUs.As soon as ONUs states change,EATC will reconfigure the wireless topology by putting the idle Radio Interfaces（RIs）into standby state,thus minimizing the energy consumption of the wireless front-end.Simulation results show that the WOES scheme can reduce the energy consumption significantly with just a little performance degradation in network throughput and end-to-end delay.

关 键 词：Fiber-Wireless（FiWi） network energy savings ONU sleep radio interface standby 

分 类 号：TN929.1[电子电信—通信与信息系统]