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A distributed approach to perform admission control in multi-hop ad hoc networks is proposed. Existing algorithms normally compute the total amount of available resources in the network, however our method evaluates if there are sufficient resources to satisfy the bandwidth demand of a new incoming flow rather than quantifying the total amount, which is impractical when considering implementation...
The collision probability experienced by each node on a link plays an important role in estimating the available bandwidth at the Medium Access Control (MAC) layer. The available bandwidth is a crucial information to the decision made by Admission Control for QoS support in wireless networks. Most of existing Admission Control schemes proposed for wireless Ad-Hoc networks neglect the fact that collision...
Broadcasting is a common operation in ad hoc routing protocols to resolve many issues. However, blind broadcasting is usually very costly and will result to serious redundancy, collision and contention. In this paper we propose a conditioned forwarding algorithm for broadcasting of on-demand multicast routing protocol. By reducing unnecessary broadcasting of route request packets based on additional...
With the widespread of IEEE 802.11 based ad hoc networks as the extend of wired networks and the importance of knowing available bandwidth to network operators, users, and bandwidth-sensitive applications, available bandwidth estimation in 802.11 based ad hoc networks has been a focus of recent research. However no consensus has arrived on how to precisely measure the available bandwidth in ad hoc...
In this paper, we propose an evolutionary topology unware TDMA MAC protocol (E-TUTM) which improves upon the existing threaded time spread multiple access (T-TSMA) protocol while preserving the advantage of the T-TSMA protocol. According to the current network topology and traffic load, our proposed E-TUTM protocol can control each node to utilize the shared wireless channel effectively by the protocol...
In this paper, we propose an evolutionary time spread multiple access (E-TSMA) protocol which is independent of topology changes for ad hoc networks. Our proposed protocol is based on protocol threading technique and a novel contention schedule with reservation and carrier sense. According to the topology density of the network and the transmission requirement, our proposed protocol can control each...
Ad hoc network consists of a group of mobile nodes that collectively form a wireless network without the aid of any infrastructure. This flexibility introduces new challenges and several medium access control (MAC) protocols have been proposed. However, these proposed protocols are unable to effectively support the diverse transmission services required by higher layer applications. In this paper,...
This paper proposes an evolutionary-dynamic TDMA slot assignment protocol (E-DTSAP) for ad hoc networks. According to the topology density of the network and the bandwidth requirement, the proposed protocol changes the frame length and the transmission schedule dynamically. Moreover, it allows the transmitter to reserve one or more unscheduled slots from the set of unassigned slots in its neighborhood...
The design of an efficient medium access control (MAC) for ad hoc networks is challenging. In this paper, we propose a dynamic TDMA slot assignment protocol (DTSAP) for ad hoc networks. According to the topology density of the network and the bandwidth requirement, our proposed protocol controls the excessive increase of unassigned slots by changing the frame length and the transmission schedule dynamically...
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