Energy efficiency becomes increasingly important due to the limited battery capacity in wireless devices while at the same time user throughput requirements are relentlessly increasing. In this paper, we study an energy efficient cooperation scheme which employs network coding to enhance the energy efficiency for mobile devices. Herein we propose that the mobile devices are clustered into mobile small cells with one of the mobile devices acting as a group head with basic transceiver, coding and relaying functionalities. Group heads coordinate the transmissions from the mobile devices in the mobile small cell to the network's base stations. The objective function of the cooperative scheme is to minimize mobile devices' energy consumption subject to a certain bit error probability. The proposed network-coding based scheme has been evaluated by means of numerical simulations and compared to both a conventional direct transmit scheme, with no cooperation groups, and a cooperative relaying scheme. Results show that, with network-coded cooperation, energy efficiency may significantly increase provided the density of base stations and mobile devices is below a certain value. Above this value none of the compared cooperation schemes may improve energy efficiency, but rather power consumption is reduced only when mobile devices transmit via base stations in their close proximity.
翻译:由于无线装置的电池容量有限,同时用户吞吐需求不断增长,能源效率越来越重要。在本文中,我们研究一个节能合作计划,利用网络编码提高移动装置的能源效率。我们在此提议移动装置组装在移动小细胞中,一个移动装置作为小组头,具有基本的收发器、编码和中继功能。小组负责人协调移动小细胞移动装置向网络基地站的传输。合作计划的目标功能是将移动装置的能源消耗降低到一定的误差概率。拟议的网络编码计划是通过数字模拟手段进行评估的,与传统的直接传输计划(没有合作小组)和协作转发计划进行比较。结果显示,如果网络编码合作,只要基地站和移动装置的密度低于一定价值,能源效率可能会大幅提高。相比,合作计划的任何价值都无法提高能源效率,但只是当移动装置通过距离很近的基站传输时,电力消耗量才会减少。