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IEEE802.11, which is the most widely used wireless LAN standard protocol, employs Binary Exponential Back-off (BEB) for reducing packet collisions. Although the BEB can effectively avoid packet collision by a simple mechanism, transmission unfairness arises under high traffic environment. Then, a large number of algorithms aimed at reducing unfairness on BEB have been reported. Most of those algorithms...
Most of the routing protocols designed for ad hoc networks assume that IEEE 802.11b is used for lowest-layer communications. In IEEE 802.11 ad hoc mode, the DCF is the basic medium access protocol. In this paper we consider voice calls over mobile ad hoc network based on 802.11b MAC. A new routing metric for searching a stable routing in ad hoc network based on an extended AODV protocol is proposed...
Co-operative localisation in wireless sensor networks (WSNs) is a method in which wireless sensor nodes interact with each other as peers to determine their physical position. In such networks it is crucial for communication between nodes to be contention free to meet the strict timing requirements. Medium Access Control (MAC) protocols provide the strongest influence over contention control in WSNs...
Recently, TDMA-based MAC protocols have been discussed in wireless sensor networks for their energy-efficient performance. But the weaknesses of clock synchronism and scheme adjustment obstruct the development of these protocols. In this paper, we introduce the token ring technology into wireless sensor networks and propose a new protocol - Token Ring MAC (TRMAC), which provides stronger resource-scheduling...
In RFID systems, a collision prevents a reader from identifying tags rapidly, and it is very important due to a limited function of passive tags. In this paper, we propose an efficient anti-collision protocol with estimation by pilot frame and identification by binary selection. Performance of the proposed algorithm is shown to be better than the other algorithms up to 7.3% -21.9%.
In recent years, wireless sensor networks have been accepted/deployed for applications ranging from environmental monitoring, wild life management, to water resource management. Networking protocols for wireless sensor networks have attracted a lot of attention both from research communities and industries. At the same time, much of the existing research work of MAC (Medium Access Control) protocols...
The IEEE 802.15.4 standard enables device level wireless connectivity in personal area networks. Its medium access control (MAC) protocol supports the exclusive use of a wireless channel through guaranteed time slot (GTS). However, the bandwidth underutilization problem occurs in GTSs when the used bandwidth is less than the available. In this paper, a new GTS scheme is presented to allow more devices...
Dynamic framed slotted Aloha (DFSA) based tag reading protocols rely on a tag estimation function to calculate the best frame size to use for a given tag set. An inaccurate estimate results in high identification delays and unnecessary energy wastage. This is particularly serious when DFSA based tag reading protocols are used in RFID-enhanced wireless sensor networks (WSNs), where nodes are battery...
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