Femto-Matching:Efficient Traffic Offloading in Heterogeneous Cellular Networks Wei Wang,Xiaobing Wu,Lei Xie and Sanglu Lu Nanjing University April 28,2015 日，+司1三13卡三分Q0 1/1
Femto-Matching: Efficient Traffic Offloading in Heterogeneous Cellular Networks Wei Wang , Xiaobing Wu, Lei Xie and Sanglu Lu Nanjing University April 28, 2015 1/1
Heterogeneous Cellular Networks ti femto-cell Micro-cell femto-cell femto-cell Marco-cell femto-cell Micro-cell femto-cell Cellular networks use multiple layers of basestations to im- prove spatial utility Small cells such as femtocell or WiFi APs help offloading the traffic form the macro-cell 2/1
Heterogeneous Cellular Networks Micro-cell femto-cell femto-cell femto-cell femto-cell Micro-cell femto-cell Marco-cell • Cellular networks use multiple layers of basestations to improve spatial utility • Small cells such as femtocell or WiFi APs help offloading the traffic form the macro-cell 2/1
User Association Problem 5m0849 WLAN Mobile devices can connect to dlink-nju Secured (WeS available) 0 multiple basestations Hiwif611 Open Basestations provide different Node2 Open service qualities OpenWrt_5.1 Coen Traditional approach SuperMan Secured (WPS available) 名 strongest signal wlantest lowest price Cpen (WPS available) highest transmission rate wlantest5G Open (WPS avarahle) Xiaomi_4CB9 Scan WLAN Direct 日+①4三1字卡2分QC 3/1
User Association Problem • Mobile devices can connect to multiple basestations • Basestations provide different service qualities • Traditional approach - strongest signal - lowest price - highest transmission rate 3/1
Problems for Existing Approaches Scenarios of suboptimal solutions 1M femto A ●For the user overly crowded basestations .For the carrier low utilization of femto-cells overload of marco-cells femto B 口，01三13卡至QC 4/1
Problems for Existing Approaches Scenarios of suboptimal solutions • For the user - overly crowded basestations • For the carrier - low utilization of femto-cells - overload of marco-cells femto A femto B 1M 1M 1M 1M 4 M 4/1
Problems for Existing Approaches Scenarios of suboptimal solutions 1.3M 1.3M femto A ●For the user -overly crowded basestations .For the carrier low utilization of femto-cells 2M overload of marco-cells femto B 日，+司1三13卡三分Q0 4/1
Problems for Existing Approaches Scenarios of suboptimal solutions • For the user - overly crowded basestations • For the carrier - low utilization of femto-cells - overload of marco-cells femto A femto B 1.3M 2M 1!"M 1.3M 2 M 4/1