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Gawas M.A.,BITS Pilani K K Birla | Gudino L.J.,BITS Pilani K K Birla | Anupama K.R.,Electronics and Instrumentation Engineering
2015 International Conference on Signal Processing and Communication, ICSC 2015 | Year: 2015

Modern wireless devices, which implement the 802.11b standard, utilizes multiple transmission rates in order to accommodate a varied range of channel conditions. Many rate adaptation algorithms proposed, utilizes the multi data rate, primarily according to the current channel quality. Most algorithms do not consider congestion around the network and proper determinant to identify it. In multi rate Ad hoc network, due to mismatched link rate, the node interface queues get overloaded. Thus causing congestion, which consequently result in packet loss, further reducing effective throughput. In this paper, we propose a novel Cross layer QoS aware Multi Rate routing protocol (CQMR) based on nodes queuing load and link state. CQMR focuses on cross-layer interactions between PHY, MAC and Network layer to utilize these multi-rate supports from 802.11b. CQMR algorithm chooses the optimal path with effective data rate and through a less congested network, which is compatible with existing 802.11 implementations. We have implemented CQMR in the NS-2 simulator and conducted extensive simulation studies over network diversity. Our analysis shows that CQMR protocol significantly increases the network performance in the packet delivery ratio and throughput. © 2015 IEEE. Source


Sreejith V.,BITS Pilani K K Birla | Khandelwal P.,Electronics and Instrumentation Engineering | Anupama K.R.,BITS Pilani K K Birla | Gudino L.J.,BITS Pilani K K Birla
2016 8th International Conference on Communication Systems and Networks, COMSNETS 2016 | Year: 2016

Scenarios where the sensor nodes themselves are mobile, introduces a new dimension of problems in sensor network. This paper presents a mobility vector based neighbour selection for a mixed deployment of mobile and static Wireless Sensor Network. The proposed approach uses the velocity of the mobile node and the residual energy of the static node to select a neighbour. Multichannel based MAC protocol is adopted for an interference free communication. The protocol was simulated and evaluated against MA-MAC protocol. Simulation results indicate that the proposed approach performs better. Proof of Concept of proposed approach was done using Berkley motes. © 2016 IEEE. Source


Sreejith V.,BITS Pilani K K Birla | Anupama K.R.,Electronics and Instrumentation Engineering | Gudino L.J.,BITS Pilani K K Birla | Suriyadeepan R.,BITS Pilani K K Birla
2015 International Conference on Control, Communication and Computing India, ICCC 2015 | Year: 2015

Streaming multimedia data in WSN is a challenge due to constraints such as bandwidth, energy and delay. Moreover, it is not economical to have multimedia sensors integrated with static nodes in the field. In this paper, we propose the use of mobile sensor nodes, which are equipped with multimedia sensors for event monitoring. These mobile entities are capable of streaming high bandwidth data by splitting it and routing the packet to the base station using Frequency Division Multiplexer (FDM) modules. This is done with the support of multi-channel disjoint path routing aided with the static WSN deployed. Experiments were done using MicaZ and TelosB motes to evaluate the performance with the help of our custom designed robotic vehicle. The paper adopts a node disjoint multi-path routing protocol for establishing parallel paths between the sender and the receiver. Experimental results indicate that the proposed approach can be effectively used for transferring high bandwidth data to the base station. Multimedia Streaming, Multichannel MAC, Mobile WSN. © 2015 IEEE. Source


Gawas M.A.,BITS Pilani K K Birla | Gudino L.J.,BITS Pilani K K Birla | Anupama K.R.,Electronics and Instrumentation Engineering
2015 International Conference on Advances in Computing, Communications and Informatics, ICACCI 2015 | Year: 2015

Mobile Ad Hoc Networks (MANETs) are a self organizing and adaptive wireless networks. Currently MANETs possess an advanced challenge in providing Quality of Service( QoS) support for real time application data streaming through the network. These applications are delay sensitive and get affected due to congestion in the network. Thus, performance degrades due to high data loss, frequent link breakage and excessive retransmission. The strict layered network structure makes even more difficult to provide solutions for such issues. We propose a protocol which cooperates between adjacent layers and performs cross layer communication. We propose a novel QoS routing for MANET called Cross Layer Best effort QoS aware routing protocol (CLBQ, which considers the metric of link quality, data rates and MAC delay as the QoS parameters. The proposed protocol implements cross layer interaction between PHY, MAC and Network layer. The simulation results conducted shows best effort QoS service to the network in discovering the route and data transfer. Our analysis shows that the protocol has improved throughput and low network overhead. © 2015 IEEE. Source


Sreejith V.,BITS Pilani K K Birla | Anupama K.R.,Electronics and Instrumentation Engineering | Gudino L.J.,BITS Pilani K K Birla | Suriyadeepan R.,BITS Pilani K K Birla
2015 21st National Conference on Communications, NCC 2015 | Year: 2015

Area exploration in WSN is used for a multitude of applications from data collection to network maintenance. In this paper, we propose a new approach - Max-Gain approach to explore an area with obstacles by modifying the utility function of frontier-based approach. The proposed approach moves the mobile nodes to a distant unexplored optimal position rather than directing it to a near frontier. The main focus of this paper is the fast area exploration using mobile nodes. We extend this approach to recover partitions in a disconnected network and hence restore connectivity. The results indicate that our approach guarantees fast area exploration with minimum communication overhead. Proposed area exploration approach is not limited to wireless sensor networks, but to any area exploration applications using mobile units. © 2015 IEEE. Source

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