Enable Device to Device Communications Underlaying Cellular Networks Challenges and Research Aspects[omnet++program]

Enable Device to Device Communications Underlaying Cellular Networks Challenges and Research Aspects

In the past two decades, there have been tremendous technology development and commercial success in wireless cellular networks.Cellular users are increasing exponentially, spread out all over the world, benefitting from various services including voice, Enable Device to Device Communications Underlaying Cellular Networks Challenges and Research Aspects data, and video. Enable Device to Device Communications Underlaying Cellular Networks Challenges and Research Aspects[omnet++program]Recently, device-to-device communications underlaying a cellular network infrastructure has been proposed and has attracted much attention. underlaying a licensed cellular network, which can provide more service guarantees in a controlled environment, enables user equipment UE to communicate with other nearby UE directly over a link under the cellular network channel resources without extra hops through the central base station. In general, communication allows fast access to the radio spectrum with a controlled interference level and holds the promise of four types of gain Enable Device to Device Communications Underlaying Cellular Networks Challenges and Research Aspects proximity gain, reuse gain, hop gain, and paring gain. Typical D2D communication applications are peer-to-peer file sharing, local voice service, video streaming, and content-aware applications. There are paramount challenges and active research activities regarding communications underlaying cellular networks. Enable Device to Device Communications Underlaying Cellular Networks Challenges and Research Aspects

First, interference management is critical since cellular networks need to manage new interference scenarios by supporting communications. Enable Device to Device Communications Underlaying Cellular Networks Challenges and Research Aspects In cellular networks, traditional cellular UEs CUEs can be considered as primary UEs, andadditional UEs DUEs should not degrade the performance of CUEs. On the other hand, Enable Device to Device Communications Underlaying Cellular Networks Challenges and Research Aspects

Enable Device to Device Communications Underlaying Cellular Networks Challenges and Research Aspect

the interference from current cellularnetworks may also hurt the quality of service QoS requirements of DUEs. Many research aspects are related to interference management, including mode selection, resource allocation, power control, Enable Device to Device Communications Underlaying Cellular Networks Challenges and Research Aspects and so on. Second, multihop D2D communication, which allows a UE to be a relay to help other UEs, has not been fully investigated yet. Network coding can be attempted in such scenarios and help improve the throughput of multihop communications underlaying cellular networks. Third, since heterogeneous cellular architecture with a mixed deployment of macro and micro base stations is a key technology in future wireless systems, coexistence of D2D communications in such heterogenous networks is also worth discussing.This article is organized as follows. First, we give a summary of D2D technology’s merits, challenges, and progress in standards. Then we focus on critical challenges and research aspects in D2D communications underlaying cellular networks: interference management, multihop D2D communications with network coding, and D2D communications in heterogeneous networks. Specifically, mechanisms such as mode selection, resource allocation, D2D communications with multi-antenna transmission techniques, and power control are considered. Finally, performance evaluation in D2D communications underlaying cellular networks is provided. The explosive demand for future applications on high data rates and spectral efficiency triggered the launch of the Third Generation Partnership Project Long Term Evolution LTE standard. LTE mobile communication systems are developed as a natural evolution of second and third generation and systems, including Global System for Mobile Communications GSM , Universal Mobile Telecommunications System UMTS , and codedivision multiple access. With orthogonal frequency-division multiplexing OFDM , multiple-input multiple-output MIMO , capacity-approaching codes, a pure packet-switched core network, and other technologies, LTE aims to achieve a peak data rate of Mb/s in the downlink and Mb/s in the uplink, respectively, as in Release. LTE-Advanced, as in Release , is an enhancement of the LTE standard, and further improves capacity and coverage. New technologies have been studied for LTE-Advanced to meet International Mobile Telecommunications IMT -Advanced requirements.