Hiren Kumar Deva Sarma

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Wireless sensor networks (WSNs) are required to provide different levels of Quality of Services (QoS) based on the type of applications. Providing QoS support in wireless sensor networks is an emerging area of research. Due to resource constraints like processing power, memory, bandwidth and power sources in sensor networks, QoS support in WSNs is a(More)
Wireless sensor network (WSN) is an emerging field. Theses are normally designed to perform a set of high level information processing tasks, for example detection, tracking or classification. Different application areas of WSNs are environmental monitoring, industrial sensing and diagnostics, infrastructure protection, battle field awareness, context aware(More)
In this paper, we present a novel energy efficient routing protocol for wireless sensor networks in which the sensor nodes as well as the base station are mobile. The protocol is hierarchical and cluster based from network structure perspective. Each cluster contains one cluster head node and two deputy cluster head nodes. The re-clustering time and energy(More)
Wireless Sensor Network Systems can be applied to monitor different environments ranging from military to civil applications. It has been observed that different protocols required for smooth functioning of the network system are highly application specific. Another important fact is that the communication protocols have significant role in achieving right(More)
Abstract— Cognitive radio wireless sensor networks (CRSN) enable optimal use of spectrum which is a scarce resource. Cognitive radio technology makes the co-existence of different wireless networks with legacy networks possible sharing the same spectrum in an opportunistic manner. In this paper, we propose a routing protocol for CRSN. The protocol organizes(More)
Wireless sensor networks (WSNs) are resource constrained. Energy is one of the most important resources in such networks. Therefore, optimal use of energy is necessary. A novel energy-efficient routing protocol is proposed for WSNs. The protocol is reliable in terms of data delivery at the base station (BS). Mobility in sensor nodes and in the BS is(More)
The wireless sensor network is an emerging field and it offers a wide variety of applications that include habitat monitoring, object tracking, environmental surveillance, military systems, health care, precision agriculture, building monitoring etc. However, due to their unique characteristics and the constraints they suffer from, sensor networks pose(More)
In Cognitive Radio Network (CRN) Cognitive Users (CUs also called Secondary Users (SUs)) make use of frequency band used by Primary Users (PUs) in an opportunistic way. Routing in CRN is a challenging job because the packets within SUs need to be routed only when channels of PUs are idle. The CRN routing protocols proposed so far, does not assume that the(More)
In this paper, a route selection mechanism for cognitive radio network (CRN)is proposed where the route construction process selects only those channels which have the maximum probability of being stable. By the term stable channel, we mean that the channel will not be claimed by primary users (PUs) frequently. A probabilistic approach for finding the(More)
A novel clustering approach for cognitive nodes in CRN based Ad Hoc Networks (CRAHNs) is proposed in this paper. The Signal to Interference plus Noise Ratio (SINR) produced by Primary Users (PUs) on collocated Cognitive Users (CUs) along with Expected Transmission Time (ETT) among CUs is taken into account in order to form the clusters. The operation of(More)