Resource allocation for energy efficient device-to-device communications /
Device-to-Device (D2D) communication is one of the technologies for next generation communication system. Unlike traditional cellular network, D2D allows proximity users to communicate directly with each other without routing the data through a base station. The main aim of this study is to improve...
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| Format: | Software eBook |
| Language: | English |
| Published: |
2018.
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| Summary: | Device-to-Device (D2D) communication is one of the technologies for next generation
communication system. Unlike traditional cellular network, D2D allows
proximity users to communicate directly with each other without routing the
data through a base station. The main aim of this study is to improve the overall
energy efficiency (EE) of D2D communications overlaying cellular system. To
reduce the complexity of joint EE optimization, we decompose the main EE problem
into two subproblems; resource efficiency (RE) optimization in the first stage
and EE optimization for D2D pairs in the second stage. Firstly, we propose an
alternative two-stage RE-EE scheme for a single cellular user equipment (CUE)
and a D2D pair utilizing uplink spectrum. Later, we extend this work for multiple
CUEs and D2D pairs by considering the downlink orthogonal frequency division
multiple access (OFDMA). By exploiting a range of optimization tools including
the Bisection method, interior point algorithm, fractional programming, Dinkelbach
approach, Lagrange dual decomposition, difference of convex functions, and
concave-convex procedure, the original non-convex problems are solved and we
present iterative two-stage RE-EE solutions. Simulation results demonstrate that
the proposed two-stage scheme for uplink scenario outperforms the cellular mode
and dedicated mode of communications and the performance is close to the global
optimal solution. The results also show that the proposed schemes for downlink
resource sharing provide improved system EE performance with significant gain
on EE for D2D users compared to a two-stage EE-EE solution, which is obtained
numerically. Furthermore, the RE and EE optimization for non-orthogonal multiple
access (NOMA) are considered to study the effect of users’ access to the
whole spectrum. The results indicate that the proposed RE scheme for NOMA
with D2D communications achieves higher system EE compared to the OFDMA
based schemes. |
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| Item Description: | Accompanied by CD : CDR 18803. |
| Physical Description: | 144 pages : color illustrations, charts, photographs ; 30 cm + 1 computer disc (12 cm) |
| Bibliography: | Reference : pages 122-144. |