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As passive optical networks (PON) are increasingly deployed to provide high speed Internet access, it is important to understand their fundamental traffic capacity limits. The paper discusses performance models applicable to wavelength division multiplexing (WDM) EPONs and GPONs under the assumption that users access the fibre via optical network units equipped with tunable transmitters. The considered...
This paper contributes to the definition of an association policy for a multi-channel, multiple AP WLAN that depends on both physical rate and realised throughput. We show that existing proposals are inefficient when several APs share the same channel and define a new policy that is demonstrated to be close to optimal. Policies are compared through their traffic capacity defined as the network stability...
The paper presents a novel MAC protocol for a ring packet-switched WDM network. The protocol is based on both opportunistic access ensuring efficient utilization of slots and dynamic reservations that maintain a certain degree of fairness between stations. We show that, while a purely opportunistic access scheme is perfectly efficient, the impact of introducing the proposed reservation algorithm is...
The IEEE 802.11 architecture offers multiple independent frequency channels. Efficient exploitation of the available frequency spectrum is one of the most promising approaches to increase network capacity. In this paper we propose an heuristic evaluation of network capacity that takes account of the dynamic nature of traffic. We use this method to derive static frequency allocations that maximize...
This paper compares two approaches to realizing adaptive routing in the Internet: flow-oblivious multi-path routing using optimal end-to-end congestion control and flow-aware routing using fair queueing to share bandwidth on one or several paths. Multi-path congestion control provides ideal performance, assuming protocols can be designed to approximate the optimal fluid model. Flow-aware networking...
Two areas of active research are likely to have a major impact on the future performance of the Internet. These are firstly, the evaluation of the buffer size required to ensure fair, stable and efficient sharing of link bandwidth and secondly, the proposition of new congestion control algorithms, more suitable for increasingly high link speeds than the current version of TCP. In this paper, we re-examine...
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