Exploiting Network Cooperation in Green Wireless Communication

TL;DR

This paper explores how user terminals can cooperate across multiple network interfaces to improve energy efficiency in green wireless communication, analyzing conditions under which cooperation reduces energy consumption.

Contribution

It introduces the concept of inter-network cooperation, analyzing its energy efficiency compared to traditional schemes under various network conditions.

Findings

Inter-network cooperation can significantly reduce energy consumption when users are appropriately spaced.

Proximity to the base station influences the energy efficiency of cooperation schemes.

Cooperation may increase energy use if users are too close or too far apart from the base station.

Abstract

There is a growing interest in energy efficient or so-called "green" wireless communication to reduce the energy consumption in cellular networks. Since today's wireless terminals are typically equipped with multiple network access interfaces such as Bluetooth, Wi-Fi, and cellular networks, this paper investigates user terminals cooperating with each other in transmitting their data packets to the base station (BS), by exploiting the multiple network access interfaces, called inter-network cooperation. We also examine the conventional schemes without user cooperation and with intra-network cooperation for comparison. Given target outage probability and data rate requirements, we analyze the energy consumption of conventional schemes as compared to the proposed inter-network cooperation by taking into account both physical-layer channel impairments (including path loss, fading, and thermal noise) and upper-layer protocol overheads. It is shown that distances between different network entities (i.e., user terminals and BS) have a significant influence on the energy efficiency of proposed inter-network cooperation scheme. Specifically, when the cooperating users are close to BS or the users are far away from each other, the inter-network cooperation may consume more energy than conventional schemes without user cooperation or with intra-network cooperation. However, as the cooperating users move away from BS and the inter-user distance is not too large, the inter-network cooperation significantly reduces the energy consumption over conventional schemes.