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Improvement of Resource Allocation Methods in Device to Device Communication Systems

Khalvandi, Reza | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49248 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Pakravan, Mohammad Reza
  7. Abstract:
  8. There is an increasing demand from mobile users for higher bandwidth, lower latency, longer battery life and better quality of service. It is expected that the next generation of mobile networks standards which is called 5G meets most of these demands. It is expected that the enhanced features of the mobile networks can be achieved within the limited bandwidth which is offered by the regulators and therefore, one of the key challenges in the development of these new technologies would be the issue of resource allocation. Efficient allocation of frequency, time and power to different users is an important issue and therefore, one of the important areas of development in these standards has been the focus of enabling direct device to device communication, called D2D.In D2D communication, transfer of data between users is managed by the network but the actual data path does not go through the network core. In other words, network allocates resources which allows near-by devices to directly communicate with each other within the allocated time, frequency and power limitations imposed on them by the network. In this thesis, we have proposed a centralized resource allocation algorithm which can be used to allocate uplink frequency and power of D2D users in a cell using the same frequencies which are available to the primary users of the cell. Therefore, the method is a non-orthogonal centralized uplink frequency resource allocation algorithm.We have proposed a resource allocation algorithm to maximize the overall network throughput while guaranteeing the QoS requirement for both D2D uses and regular cellular users. This scheme is based on analytical geometry concepts for allocation of frequency and power resource to D2D users. Simulation results show that the proposed scheme performs much better than the previous approaches reported in the literature. For example, total number of D2D users which can be activated by the network has been increased between 3 to 5 times and total achievable rate of D2D users has increased between 1.5 to 2 times. Also, average power consumption of D2D users has been decreased by a factor of 5 or more. We investigated the complexity of the proposed algorithm and demonstrated that it increases linearly with the number of D2D users and the total available frequency resources within a given cell. We have also proposed methods to reduce the network signaling required for the operation of the algorithm
  9. Keywords:
  10. Fifth Generation of Mobile Networks ; Interference Management ; Device to Device Communications ; Resources Allocation ; Cellular Users

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