Abstract
To cope with the shortage of available licensed spectrum, 4th Generation Long Term Evolution (4G LTE) is expected to be deployed also in the unlicensed spectrum. This raises the problem of the coexistence of multiple operators. Obviously, a Software Defined Networking (SDN) based control approach can utilize the radio bandwidth by coordinating between multiple LTE-Unlicensed (LTE-U) operators. Within SDN control plane, there is a well-known issue namely the Controller Placement Problem (CPP) which has a major impact on the efficiency of the control plane. This paper addresses the Wireless Controller Placement Problem (WCPP) when the SouthBound interface (SBi) is based on 4G LTE unlicensed. The proposed solution improves the throughput, link failure probability and the transparency on the SBi from concurrent transmissions on the control plane. Two heuristic solutions are considered, one is a simulated annealing based and the other is a ray-shooting based. The simulation results show that they are fast and efficient and the ray-shooting based heuristic out-performs the simulated annealing based heuristic. In addition, it is shown that the transparency improves in bigger networks.
Highlights
The rapid proliferation of media-rich mobile devices has brought a dramatic increase in mobile data traffic
Summary: The Long Term Evolution (LTE)-U-Controller Placement Problem (CPP)-RS heuristic calculates a lower number of controllers which is closer to the optimum
REQUIRED NUMBER OF CONTROLLERS One of the most important results of the LTE-U-CPP is the number of controllers that is required for the performance of the control plane
Summary
The rapid proliferation of media-rich mobile devices has brought a dramatic increase in mobile data traffic. This paper extends our previous work [14] and proposes a solution to the CPP in the case of LTE-U networks (LTE-U-CPP), by taking the complexities of the wireless medium between the control plane and the data plane into account and considering the model of two coexisting cellular LTE-U operators that share the common unlicensed bands. The contribution of this work is as follows: 1) A novel model for the metrics of the LTE-U-CPP that are specific to the cellular SDN i.e., throughput and link failure probability on the SBi. 2) An objective function for the LTE-U-CPP (Section V) consisting of the weighted sum of the spatial throughput, spatial link failure probability and transparency..
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