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  • 1.
    Abusubaih, Murad
    et al.
    TU Berlin.
    Wiethoelter, Sven
    TU Berlin.
    Gross, James
    Wolisz, Adam
    TU Berlin.
    A New Access Point Selection Policy for Multi-Rate IEEE 802.11 WLANs2008Ingår i: International Journal of Parallel, Emergent and Distributed Systems, ISSN 1744-5760, E-ISSN 1744-5779, Vol. 23, nr 4, s. 291-307Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In wireless local area networks, often a station can potentially associate with more than one access point (AP). Therefore, a relevant question is which AP to select 'best' from a list of candidate ones. In IEEE 802.11, the user simply associates to the AP with the strongest received signal strength. However, this may result in a significant load imbalance between several APs. Moreover, the multi-rate flexibility provided by several IEEE 802.11 variants can cause low bit rate stations to negatively affect high bit rate ones and consequently degrade the overall network throughput. This paper investigates the various aspects of 'best' AP selection for IEEE 802.11 systems. In detail, we first derive a new decision metric which can be used for AP selection. Using this metric, we propose two new selection mechanisms which are decentralised in the sense that the decision is performed by each station, given appropriate status information of each AP. In fact, only few bytes of status information have to be added to the Beacon and Probe Response frames which does not impose significant overhead. We show that our mechanism improves mean quality of service of all stations and better utilises network resources compared to the conventional one implemented today in IEEE 802.11 devices. Also, the schemes are appealing in terms of stability and provide their performance improvement even for denser or lighter network configurations.

  • 2. Talebi, Mohammad Sadegh
    et al.
    Jafari, Fahimeh
    School of Computer Science, IPM, Tehran, Iran .
    Khonsari, Ahmad
    Yaghmaee, Mohammad Hossein
    Proportionally fair flow control mechanism for best effort traffic in network-on-chip architectures2010Ingår i: International Journal of Parallel, Emergent and Distributed Systems, ISSN 1744-5760, E-ISSN 1744-5779, Vol. 25, nr 4, s. 345-362Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The research community has recently witnessed the emergence of multi-processor system on chip (MPSoC) platforms consisting of a large set of embedded processors. Particularly, Interconnect networks methodology based on network-on-chip (NoC) in MPSoC design is imminent to achieve high performance potential. More importantly, many well established schemes of networking and distributed systems inspire NoC design methodologies. Employing end-to-end congestion control is becoming more imminent in the design process of NoCs. This paper presents a centralised congestion control scheme in the presence of both elastic and streaming flow traffic mixture. We model the desired best effort source rates as the solution to an optimisation problem with weighted logarithmic objective which is known to admit proportional fairness criterion. The problem is constrained with link capacities while preserving guaranteed service traffics services requirements at the desired level. We propose an iterative algorithm as the solution to the optimisation problem which has the benefit of low complexity and fast convergence, and can be implemented by a controller unit with low computation and communication overhead.

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