GATE: Greening At The Edges

Nirwan Ansari
Professor, Electrical and Computer Engineering
New Jersey Institute of Technology
Wachman 1015D
Friday, November 22, 2013 - 11:00

GATE (Greening At The Edges) aims to transform the access portion of communications infrastructure into an energy efficient one. In the future high capacity access networks, the wireline access part will be made up of fiber-to-the-home or hybrid fiber-to-the-node (FTTN), and the wireless part will be provisioned by various advanced technologies, such as advanced antenna techniques, heterogeneous networks with mixed high/low power base stations deployment, and cooperative communications. Greening such high capacity access networks is a great challenge of the coming decade. To tackle the challenge, we introduce the “capacity-adaptive” feature into the envisioned network. The “capacity-adaptive” feature helps decrease the network energy consumption for the following reasons. While many applications at end users are bandwidth demanding, end users may not run these applications all the time. According to the daily traffic pattern for Swedish and Spanish DSL and FTTH households, the residential access network traffic peaks around 8:00 pm, bottoms between 4:00 am and 6:00 am, and the peak to bottom ratio is as large as 4:1. Thus, a significant amount of energy has been wasted by provisioning the same high data rate to end users all the time. Taking advantage of the bursty and dynamic nature of the access network traffic, we propose a capacity-adaptive green access network which reduces the network energy consumption by switching from the “high-capacity high-power” mode into the “low-capacity low-power” mode when the network is lightly loaded.