Ad hoc wireless distribution service

About: Ad hoc wireless distribution service is a research topic. Over the lifetime, 17734 publications have been published within this topic receiving 488205 citations.

Reliable MAC broadcast protocol in directional and omni-directional transmissions for vehicular ad hoc networks

Abstract: This paper presents the design, implementation and simulation results of a reliable Medium Access Control (MAC) broadcast protocol for Vehicular Ad hoc Networks for omni-directional and directional transmissions. The IEEE 802.11 MAC protocol uses control frames for handshaking to reliably communicate unicast data. In contrast, the broadcast data is transmitted without any control frames. This results in increased collisions due to hidden terminal problem, which in turn reduces the reliability of the broadcast service. This problem also exists in MAC protocols based on directional transmissions. To overcome this problem in Directional MAC (DMAC), we adapted Batch Mode Multicast MAC (BMMM) protocol, which uses control frames for broadcast transmissions. We implemented BMMM in NS-2 for omni-directional and Directional MAC protocols. Simulations are run for city traffic scenarios and the results are compared with IEEE 802.11 unreliable broadcast support. The simulations and comparison are done for two variants of BMMM protocol implementation integrated with DMAC.

The effects of MAC protocols on ad hoc network communication

Abstract: As mobile computing gains popularity, the need for ad hoc routing protocols will continue to grow. There have been numerous simulations comparing the performance of these protocols under varying conditions and constraints. One question that arises is whether the choice of MAC protocol affects the relative performance of the routing protocols being studied. This paper investigates the answer to that question by simulating the performance of three ad hoc routing protocols when run over different MAC protocols. It is determined that the choice of MAC layer protocol does, in fact, affect the relative performance of the routing protocols.

A joint scheduling, power control, and routing algorithm for ad hoc wireless networks

Abstract: In wireless networks there is strong coupling among the traditional layers of the architecture, and these interactions cannot be ignored. One example is the interaction between routing in the network layer and access control in the MAC layer. Another one is the coupling between power control in the physical layer and scheduling in the MAC layer. In this paper, we assume a TDMA-based wireless ad hoc network and provide a centralized algorithm of joint power control, scheduling, and routing. Simulation results show the improvement of the network performance, in terms of throughput, delay, and power consumption, through use of the joint algorithm. Energy efficiency is another important aspect of ad hoc networking, and is considered in our algorithm. Our simulation also shows the trade-off between energy consumption and network throughput or delay performance.

An improved Energy-Efficient PEGASIS-Based protocol in Wireless Sensor Networks

Abstract: EEPB (Energy-Efficient PEGASIS-Based protocol) is a chain-based protocol which has certain deficiencies including the uncertainty of threshold adopted when building a chain, the inevitability of long link (LL) when valuing threshold inappropriately and the non-optimal election of leader node. Aiming at these problems, an improved energy-efficient PEGASIS-based protocol (IEEPB) is proposed in this paper. IEEPB adopts new method to build chain, and uses weighting method when selecting the leader node, that is assigning each node a weight so as to represent its appropriate level of being a leader which considers residual energy of nodes and distance between a node and base station (BS) as key parameters. The simulation results show that IEEPB has a better performance than EEPB on balancing energy consumption and prolonging lifetime of Wireless Sensor Networks (WSN).

QoS for Ad hoc Networking Based on Multiple Metrics: Bandwidth and Delay.

Abstract: A link state routing approach makes available detailed information about the connectivity and the condition found in the network. OLSR protocol is an optimization over the classical link state protocol, tailored for mobile ad hoc networks. In this article, we design a QoS routing scheme over OLSR protocol, called QOLSR. In our proposal, we introduce more appropriate metrics than the hop distance used in OLSR. In order to improve quality requirements in routing information, delay and bandwidth measurements are applied. The implications of routing metrics on path computation are examined and the relational behind the selection of bandwidth and delay metrics are discussed. We first consider algorithms for single-metric approach, and then present a distributed algorithm for multiple metrics approach. We also present a scalable simulation model close to real operations in Ad Hoc Networks. The performance of our protocol are extensively investigated by simulation. Our results indicate that the attained gain by our proposal represent an important improvement in such mobile wireless networks.