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Inband D2D Communication for mmWave 5G Cellular NetworksAuthor: Gadiraju Divija Date: 2018-08-04 Report no: IIIT/TH/2018/57 Advisor:Garimella Ramamurthy AbstractThe cellular users’ demand has increased drastically with the emergence of mobile internet technologies. In order to satisfy the demand, cellular service providers have improved each generation of cellular networks over its predecessors. However, the fifth generation (5G) cellular technologies would revolutionize the network architecture and would go beyond the trend of previous generations. Device-to-Device (D2D) communication is one such revolutionary technology in which the mobile users communicate with each other directly without traversing the base station. D2D communication is actively studied with special focus on public safety in 3GPP. D2D communication with network control has many other use-cases. Also, the 5G cellular technology includes millimeter wave (mmWave) for communication. Along with massive bandwidth availability at mmWave frequencies, the advantage of extensive frequency reuse and directive propagation is gained. The integration of device-to-device (D2D) and mmWave technology would improve the system performance and spectral efficiency to a great extent. Moreover, with the emerging trends in Internet-of-Things (IoT), massive device connectivity is required with high connection speed. Hence, D2D communication technology plays a vital role in maintaining Quality of Service (QoS) in IoT applications. The thesis studies D2D communication in inband mode where the resources of the licensed spectrum are used for communication. The work emphasizes on the system performance improvement because of the integration of mmWave technology and D2D communication. Underlay mode D2D communication, where the devices reuse the resources of a cellular user, is analyzed. The problems of resource allocation and interference avoidance are addressed. Then, the importance of fairness in resource allocation and the power allocation are studied. An approach for resource allocation and power allocation is proposed which is adaptive to traffic demand. Results show that the proposed scheme can significantly enhance the system performance in terms of fairness and spectral efficiency. Inband D2D communication with selective operation in underlay and overlay modes aiming to maximize QoS is explored. Spectrum underutilization is the key challenge in overlay mode which is addressed in this work. In areas with high call traffic density, D2D communication can operate in overlay mode because of its low complexity as resources are dedicated and the absence of interference with cellular users. In order to maximize spectrum utility, resources are dynamically assigned to overlay mode based on traffic demand. System performance in overlay mode is analyzed. A dynamic mode selection scenario is considered while addressing resource allocation, power control and interference avoidance. Thus, formulated problem is solved using a single heuristic algorithm for resource management in both the modes. Performance of the proposed algorithm is evaluated through simulations. The proposed scheme has optimal performance for a dense 5G network in controlled underlay and overlay operations and overcomes the problem of spectrum wastage in overlay mode by its selective operation. Full thesis: pdf Centre for Communications |
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