Results 1 -
3 of
3
A new local stability based routing mechanism for mobile ad-hoc net- works
"... Abstract: Routing in MANET is a challenge owing to the dynamic nature of network topology and resource constraints. With the dynamic and mobile nature of ad hoc wireless networks, links may fail due to topological changes by mobile nodes. As the degree of mobility increases, the wireless network wo ..."
Abstract
- Add to MetaCart
(Show Context)
Abstract: Routing in MANET is a challenge owing to the dynamic nature of network topology and resource constraints. With the dynamic and mobile nature of ad hoc wireless networks, links may fail due to topological changes by mobile nodes. As the degree of mobility increases, the wireless network would suffer more link errors. Ad hoc routing protocols that use broadcast to discover routes may become inefficient due to frequent failures of intermediate connections in an end-to-end communication. When an intermediate link breaks, it is beneficial to discover a new route locally without resorting to an end-to-end route discovery. Based on the concept of localizing the route request query, we propose an efficient approach to repair error links quickly. A stable routing mechanism is proposed for mobile ad-hoc network in this paper, focusing on the instability problem derived from communication gray zone. This mechanism is a cross-layer enhancement of ad hoc on-demand vector (AODV) routing protocol, which is named as AODV_CL. The routing discovery algorithm is extended by introducing the notion of source routing and ad hoc on-demand multipath distance vector (AOMDV) routing. A computing model is established to map received signal strengths into link stability factor and route stability factor which serves as a routing metric for path selection. In contrast to the reactive way in AODV, the received signal strength can be used to reveal the link state information for gray zone prediction, as well as for route state monitoring. A HELLO-based preemptive local route repair algorithm is presented to prevent the occurrence of link breakage. HELLO message is extended not only for neighbor sensing and neighborhood information exchanging, but also as an ON/OFF command to control the position location scheme and HELLO scheme of neighbor nodes.
for Indoor Communications
"... Abstract — With the increase in the capacity of mobile communication devices, it is but natural to expect that these devices would work ubiquitously anywhere anytime to offer high data rate support. Recently 60 GHz frequency band has been identified as an obvious choice for the high data rate indoor ..."
Abstract
- Add to MetaCart
(Show Context)
Abstract — With the increase in the capacity of mobile communication devices, it is but natural to expect that these devices would work ubiquitously anywhere anytime to offer high data rate support. Recently 60 GHz frequency band has been identified as an obvious choice for the high data rate indoor communications. However, as the 60GHz radio system relies on line-of-sight (LOS) transmission for achieving Gbps data rate, the communication can be easily interrupted by obstructions breaking the LOS link, which happens often due to the movement of people in a typical indoor environment. In this paper, we define and present an analytical model for assessing link stability of 60 GHz radio for indoor wireless networks. We have developed a ray-based model to calculate the shadowing loss caused by the presence of people around the communication link while taking into account the indoor channel characteristics of 60 GHz radio and the antenna configuration. We have further considered different types of mobility of people with the ray-based model of 60 GHz link to obtain a holistic link stability model in realistic scenarios. We have given examples to show the relevance of our model and its applicability using both simulation and numerical evaluations1. Index Terms — 60 GHz radio, link stability, line-of-sight,
(C) Global Journal Of Engineering Science And Researches [86-95] GLOBAL JOURNAL OFENGINEERINGSCIENCE ANDRESEARCHES EFFICIENT NEIGHBOR ROUTE DISCOVERY PROTOCOL [ENRDP] FOR POSITION VERIFICATION IN MANET
, 2014
"... Energy awareness and protocol management is becoming an important factor in the design of MANET protocols. Because of mobility, it needs the support of scalable routing strategies. These protocols try to consider the path duration in order to respect some QoS constraints and to reduce fake neighbor ..."
Abstract
- Add to MetaCart
(Show Context)
Energy awareness and protocol management is becoming an important factor in the design of MANET protocols. Because of mobility, it needs the support of scalable routing strategies. These protocols try to consider the path duration in order to respect some QoS constraints and to reduce fake neighbor position for route discovery. In the existing system communication and packet delivery ratio decreases when neighbor discovery fails. The proposed ENRDP protocol selects the stable path to reduce the fake position and communication overhead. It selects the stable path, so neighbor discovery failure decreases and there by increases the packet delivery ratio and reduces energy consumption, End-to-End delay and packet lost. The effectiveness of ENRDP protocol is demonstrated through NS2 stimulation. Keywords:MANET, ENRDP, Neighbor discovery, Secure neighbor Discovery, Neighbor position verification. I.
