Achieving per‐flow fairness in wireless ad hoc networks

Abstract

SUMMARYMobile ad hoc networks attract tremendous attention as one form of future network configuration. Among wireless LAN technologies, the IEEE 802.11MAC standard can be considered as the most prominent technology deployed in ad hoc networks. For realization of mobile ad hoc networks, providing QoS support in ad hoc networks is an important task. Among numerous parameters of QoS, perflow fairness is an important and problematic issue in ad hoc networks. In the traditional wireline networks, per-flow unfairness occurs mainly due to the link layer. However, in mobile ad hoc networks, in addition to the link layer, the MAC layer has significant impact on per-flow fairness problems. In particular, although IEEE 802.11MAC provides per-node fair bandwidth allocation, in order to achieve per-flow fairness, a method that provides per-flow fair bandwidth allocation is required. In this paper, a new scheme is proposed that enables a fair bandwidth allocation to each flow. In addition to fairness, the proposed scheme provides a positive impact on the network in terms of total performance and medium utility. The performance of the proposed scheme is investigated with an ns-2 network simulator.

Fairness and throughput improvement in multihop wireless ad hoc networks

“…Similarly, [7] has in order, otherwise the results will be different and fairness index will decrease. Like [3], this scheme assumes MAC layer fairness, hence fair bandwidth allocation may not be satisfied. Similarly, a performance improvement in wireless sensor networks is studied in [12], and a new approach, called PCRQ is suggested in [6].…”

“…The bandwidth assignment for each station at the MAC layer cannot guarantee per flow fairness. Similarly, the direct flow has advantages over forwarding flows in queue contention [2,3,4]. We define total throughput as the average of total goodput of all flows during simulation, and use fairness index defined by R. Jain [5] as follows:…”

Problem analysis and solution for performance improvement in multi-hop ad hoc network

“…Điều này dẫn đến sự tương tranh giữa luồng dữ liệu trực tiếp và luồng dữ liệu chuyển tiếp trong bộ đệm tại tầng điều khiển liên kết logic (LLC). Hiển nhiên là luồng dữ liệu trực tiếp sẽ có nhiều lợi thế hơn luồng dữ liệu chuyển tiếp [1,2]. Hơn nữa, các trạm trong mạng không dây đa chặng cũng phải chia sẻ băng thông với các trạm láng giềng.…”

Tsmehp- Enhancing Efficiency of Wireless Sensor Networks Through Clustered Heterogeneous Protocol

“…Due to multiple functions and comfort of deployment of the sensor nodes it can be used in various applications such as target tracking, environment monitoring, health care, forest fire detection, inventory control, energy management, surveillance and reconnaissance, and so on [1]. The main responsibility of the sensor nodes in a network is to forward the collected information from the source to the sink for further operations, but the resource boundaries [2], unreliable links between the sensor nodes in combination with the various application demands of different applications make it a difficult task to design an efficient routing algorithm in wireless sensor networks.…”