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RISS 인기검색어
- 검색키워드
- 저자 : Yazan M. Allawi (검색결과 3 건)
- 무료
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Cost-effective topology design for HSR resilient mesh networks
Allawi, Yazan M.,Dujeong Lee,Kyusang Lee,Rhee, June-Koo Kevin IEEE 2015 Journal of optical communications and networking Vol.7 No.1
<P>High-availability seamless redundancy (HSR) protocol provides a zero failover time protection applicable to any Ethernet topology. HSR is also capable of tolerating multiple simultaneous failures, which further promotes the application of packet-based Ethernet protection. Deploying HSR in mesh networks may incur a significant unnecessary cost if not designed carefully. This paper addresses the problem of minimizing the cost of HSR mesh networks given a network availability constraint. We first develop an enumeration-based method to find the optimal design. However, due to the NP-hard complexity of the problem, this is limited to only small networks. Hence, a novel two-step heuristic algorithm is proposed. The algorithm first searches a design of an initial mesh topology compliant with HSR survivability conditions, and then an evolution process takes place to find a modification of the initial topology that satisfies the required availability. The simulation results show that our heuristic algorithm achieves a comparable performance close to optimal while being computationally scalable.</P>
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A Wireless Link-Up Augmentation Design for Disaster-Resilient Optical Networks
Allawi, Yazan M.,Dujeong Lee,Rhee, June-Koo Kevin IEEE 2015 Journal of Lightwave Technology Vol.33 No.17
<P>In view of the increasing frequency and damage severity of disasters, network operators have become more concerned with providing disaster-resiliency measures for their optical network infrastructure, whereas mitigating network service interruption due to the disaster region failures in the optical physical medium merely by increasing network redundancy is deemed spatially inefficient and very costly, with recent advancements, wireless technology is a potential candidate solution for efficient medium diversification. This paper addresses the challenge of efficiently designing disaster-resilient wireless-link-augmented optical network infrastructure. We formulate this problem as an optimization model of finding the subset of links in an optical network topology whose wireless augmentation maximizes postdisaster recovery of overall network availability for a given budget constraint. To overcome the computational complexity of finding the optimal design solution, a novel greedy heuristic algorithm is proposed. Performance comparisons with an exhaustive enumeration search and simple heuristics demonstrate the efficiency and scalability of our heuristic algorithm.</P>
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Yazan M. Allawi,김근영,Jungbum Cho,Ahmad G. Reza,나용수,이준구 한국통신학회 2018 ICT Express Vol.4 No.3
We propose a novel dynamic subcarrier allocation (DSCA) design for dual-band orthogonal frequency division multiple access passive optical network (DB-OFDMA-PON), supporting integrated fronthaul and backhaul services, given their stringent requirements in emerging 5G networks. An optimization problem is formulated to maximize both the bandwidth utilization and QoS guarantees. The simulation results show that our proposed DSCA achieves the desired statistical multiplexing gain and high performance in terms of throughput and delay.
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