Mamta Agiwal

Hybrid Directional Discontinuous Reception (HD-DRX) for 5G Communication

For mmWave directional air interface expected in 5G communications, current discontinuous reception (DRX) mechanisms would be inadequate. Beam searching, for alignment of beams at User Equipment (UE) and 5G base station (NR nodeB), cannot be avoided in directional communication. We propose to exploit dual connectivity of UE, to both LTE eNB and NR nodeB, for effective 5G DRX. We present a novel hybrid directional-DRX (HD-DRX) mechanism, where beam searching is performed only when necessary. Probabilistic estimate of power saving and delay is conducted by capturing various states of UE through a semi-Markov process. Our numerical analysis achieves 13% improvement in power saving for HD-DRX compared with directional-DRX. We validate our numerical analysis with simulation studies on real traffic trace.

Ten Commandments of Emerging 5G Networks

Insightful choice of enabling technologies tend to effectuate a smooth transition from legacy networks to fifth generation wireless communication systems (5G). Future wireless networks must address exponential growth in connectivity, capacity and services, while perpetuating energy and cost reductions. It is therefore, crucial to intelligently evaluate key contenders of 5G evolution. This article provides an overview of ten fundamental concepts that could impact 5G framework. An outline of expected benefits is deliberated in this paper. We discuss compelling need of a new spectrum followed by associated changes in terms of air interface, architecture and MAC layer protocols. For alleviating access complexity in diverse-dense 5G deployment, we make a review on Heterogeneous-Cloud Radio Access Networks and Software Defined Networking. We also discuss two disruptive approaches with high research challenges, non orthogonality and full duplex.

Towards Connected Living: 5G Enabled Internet of Things (IoT)

ABSTRACT Connected living − the true vision of the Internet of Things (IoT) – offers improvement in the quality of life while presenting new business avenues. A combined effort by researchers, industries, manufacturers, service providers, and other stakeholders is required to address distinct IoT requirements. This convergence is expected to unleash a new dimension of opportunities that cannot be fully realized with conventional solutions. At the same time, 5G wireless promises a new connected ecosystem with potential technologies, like massive Multiple-Input and Multiple-Output (MIMO), Cloud Radio Access Network (C-RAN), Heterogeneous-CRAN (H-CRAN), mmWave, software-defined networking, information (content or data)-centric communication, Multi-RAT, and novel multiplexing. Since emerging 5G network is expected to revolutionize the way of communication, its design and standardization should consider IoT as one of the major guidelines. To this regard, we present technical details of emerging 5G networks inline with pressing IoT requirements, essential for the ultimate shaping of a connected living. We also delineate limitations of legacy networks to provide for peculiarities of IoT requirements.

Flexible Beamforming in 5G Wireless for Internet of Things

ABSTRACT The next generation mobile networks would transform not only the way people communicate, but also how they access physical entities. The convergence of things into human-centric wireless communication would unleash opportunities for a better quality of life, while offering new business avenues. Conventional solutions cannot fully realize dense, diverse and heterogeneous dimensions expected in unified connectivity of “things” over the “Internet” (IoT). At the same time, emerging 5G wireless networks promise improvement in spectrum availability, ubiquitous connectivity, overall throughput and energy efficiency. However, to encompass the dynamics of human-centric and machine-centric communication, it is important to explore 5G wireless technologies for flexibility and scalability. To this regard, we propose flexible beamforming (FBF) antenna architecture that allows flexibility in terms of data rates, coverage and scalability in an energy-efficient manner. We capture initial lessons from investigations on mmWaves, beamforming, downtilt and small cell deployment strategies. Our simulation experiments, using real 5G testbed parameters, validate performance benefits of the proposed FBF antenna architecture. With around 4 Gbps throughput capacity, FBF promises higher scalability. Moreover, FBF achieves 53% higher energy efficiency than maximum power beams.