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      Small Cell Offloading Through Cooperative Communication in Software Defined Heterogeneous Networks

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          Abstract

          To meet the ever-growing demand for a higher communicating rate and better communication quality, more and more small cells are overlaid under the macro base station (MBS) tier, thus forming the heterogeneous networks. Small cells can ease the load pressure of MBS but lack of the guarantee of performance. On the other hand, cooperation draws more and more attention because of the great potential of small cell densification. Some technologies matured in wired network can also be applied to cellular networks, such as Software-defined networking (SDN). SDN helps simplify the structure of multi-tier networks. And it's more reasonable for the SDN controller to implement cell coordination. In this paper, we propose a method to offload users from MBSs through small cell cooperation in heterogeneous networks. Association probability is the main indicator of offloading. By using the tools from stochastic geometry, we then obtain the coverage probabilities when users are associated with different types of base stations (BSs). All the cell association and cooperation are conducted by the SDN controller. Then on this basis, we compare the overall coverage probabilities, achievable rate and energy efficiency with and without cooperation. Numerical results show that small cell cooperation can offload more users from MBS tier. It can also increase the system's coverage performance. As small cells become denser, cooperation can bring more gains to the energy efficiency of the network.

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          Author and article information

          Journal
          2016-06-13
          2016-09-16
          Article
          10.1109/JSEN.2016.2581804
          1606.03912
          e3878834-529f-4de3-bda5-13db4c75edad

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

          History
          Custom metadata
          IEEE Sensors Journal, vol. 16, no. 20, pp. 7381-7392, Oct. 2016
          12 pages, 7 figures
          cs.NI cs.IT math.IT

          Numerical methods,Information systems & theory,Networking & Internet architecture

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