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RISS 인기검색어
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- 저자 : Agrawal Dharma P. (검색결과 5 건)
- 무료
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Broadcasting based on Selfish Probability in Mobile Ad Hoc Networks
Jaesoo Kim,Jeonghong Kim,Dharma P. Agrawal 한국멀티미디어학회 2006 한국멀티미디어학회 국제학술대회 Vol.2006 No.-
In a mobile ad hoc network (MANETs), broadcasting is extensively used in route discovery, address resolution, and many other network services. The efficiency of broadcasting protocol can dramatically affect the performance of the entire network. In a MANET, we categorize mobile hosts into normal nodes and selfish nodes. Normal nodes forward packets for other nodes while selfish nodes do not. In this paper, we propose broadcasting mechanism based on selfish probability MANETs. The advantage of using selfish nodes is that the total rebroadcast traffic can be reduced. The disadvantage, in theory, is that we may miss the optimal route and suffer from a low delivery rate. Using this method, we can reduce routing cost by minimizing the number of rebroadcasts in route discovery phase, while achieving higher delivery rate due to the reduction of rebroadcast traffic, which leads to fewer collisions. We compare our approach with AODV Simulation results show that our approach outperforms the AODV protocol minimizing the number of rebroadcasts.
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5G mobile technology: A survey
Rupendra Nath Mitra,Dharma P. Agrawal 한국통신학회 2015 ICT Express Vol.1 No.3
All new 5G mobile technology is expected to be operational by 2020. This time, it is therefore crucial to know the direction of research and developments enabling 5G technology. This paper provides an inclusive and comprehensive analysis of recent developmental endeavors toward 5G. It highlights salient features, i.e., flexibility, accessibility, and cloud-based service offerings, those are going to ensure the futuristic mobile communication technology as the dominant protocol for global communication.
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A Scalable Explicit Multicast Protocol for MANETs
Gossain Hrishikesh,Anand Kumar,Cordeiro Carlos,Agrawal Dharma P. The Korea Institute of Information and Commucation 2005 Journal of communications and networks Vol.7 No.3
Group oriented multicast applications are becoming increasingly popular in mobile ad hoc networks (MANETs). Due to dynamic topology of MANETs, stateless multicast protocols are finding increased acceptance since they do not require maintenance of state information at intermediate nodes. Recently, several multicast schemes have been proposed which scale better' with the number of multicast sessions than traditional multicast strategies. These schemes are also known as explicit multicast (Xcast; explicit list of destinations in the packet header) or small group multicast (SGM). In this paper, we propose a new scheme for small group' multicast in MANETs named extended explicit multicast (E2M), which is implemented on top of Xcast and introduces mechanisms to make it scalable with number of group members for a given multicast session. Unlike other schemes, E2M does not make any assumptions related to network topology or node location. It is based on the novel concept of dynamic selection of Xcast forwarders (XFs) between a source and its potential destinations. The XF selection is based on group membership and the processing overhead involved in supporting the Xcast protocol at a given node. If the number of members in a given session is small, E2M behaves just like the basic Xcast scheme with no intermediate XFs. As group membership increases, nodes may dynamically decide to become an XF. This scheme, which can work with few E2M aware nodes in the network, provides transparency of stateless multicast, reduces header processing overhead, minimizes Xcast control traffic, and makes Xcast scalable with the number of group members.
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Indoor Link Quality Comparison of IEEE 802.11a Channels in a Multi-radio Mesh Network Testbed
Bandaranayake, Asitha U,Pandit, Vaibhav,Agrawal, Dharma P. Korea Information Processing Society 2012 Journal of information processing systems Vol.8 No.1
The most important criterion for achieving the maximum performance in a wireless mesh network (WMN) is to limit the interference within the network. For this purpose, especially in a multi-radio network, the best option is to use non-overlapping channels among different radios within the same interference range. Previous works that have considered non-overlapping channels in IEEE 802.11a as the basis for performance optimization, have considered the link quality across all channels to be uniform. In this paper, we present a measurement-based study of link quality across all channels in an IEEE 802.11a-based indoor WMN test bed. Our results show that the generalized assumption of uniform performance across all channels does not hold good in practice for an indoor environment and signal quality depends on the geometry around the mesh routers.
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