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RISS 인기검색어
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- 저자 : Friderikos, Vasilis (검색결과 3 건)
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Optimal Vertical Handover Control Policies for Cooperative Wireless Networks
Papadaki, Katerina,Friderikos, Vasilis The Korea Institute of Information and Commucation 2006 Journal of communications and networks Vol.8 No.4
Inter-operability between heterogeneous radio access technologies (RATs), in the sense of seamless vertical han-dover (VHO) support with common radio resource management (CRRM) functionalities, has recently attracted a significant research attention and has become a prominent issue in standardization fora. In this paper, we formulate the problem of load balancing between cooperative RAT's as a mathematical program and by trading off a pre-defined delay tolerance per request we propose a vertical handover batch processing (VHBP) scheme. To quantify the performance of the proposed VHBP scheme we compare it with a baseline processing scheme, where each VHO request is processed independently under a number of different network scenarios. Numerical investigations reveal significant net benefits of the proposed scheme compared with the baseline, both in terms of achieved load balancing levels but also with regard to the acceptance rate of the VHO requests.
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Interference-Aware Path Planning Optimization for Multiple UAVs in Beyond 5G Networks
Jongyul Lee,Vasilis Friderikos 한국통신학회 2022 Journal of communications and networks Vol.24 No.2
Integrating unmanned aerial vehicles (UAVs) asflying base stations (FBSs) is expected to be an important architecturalelement in the beyond 5G/6G mobile wireless networks. Akey operational aspect in UAV-aided 5G/6G networks is the UAVpath optimization (or trajectory planning as it is also commonlyreferred to). In this paper, we address this problem using a mixedinteger linear programming (MILP) formulation for FBS pathoptimization in terms of traveling time considering co-channelinterference and time windows in serving ground users (GUs)at cluster points (CPs) for constructing the multiple UAV pathsin both a single-cell and a multi-cell wireless network. In theproposed technique, we assume that all FBSs depart and returnto a single depot, which is considered to be a terrestrial 5G/6Gbase station (BS). The novelty of the proposed solution comparedto previous techniques is that we take explicitly into account theinterference under the unit disk graph (UDG) model to createinterference-aware UAV’s trajectory. Numerical investigationsreveal that the proposed interference-aware path optimizationapproaches improve the overall performance of the network up toapproximately 21% in terms of throughput for the FBSs. Notably,these gains come with an unnoticeable increase in the totalcompletion time, which is comparable to well-known previouslyproposed solutions. Additionally, the proposed heuristic algorithmsprovide competitive decision making with low underlyingcomputational complexity rendering them amenable for real-timeimplementation.
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