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The adaptive modulation and coding (AMC) schemes has long been adopted at physical layer to combat time-varying properties of the wireless channel. However, transmitting packet over deep fading channel can render extra energy expenditure, due to the incorporation of more error protection or usage of lower modulation mode, which is unaffordable for energy-limited wireless sensor device. To avoid such...
This paper presents a QoS research study on ad hoc sensor networks from a delay point of view when WEP (wired equivalent privacy) security is enabled or disabled. A queuing model with one queue and two servers is used to estimate the security delays in the traffic between ad hoc sensor nodes. An algorithm is designed to estimate the service time delay and the security time delay based on measured...
We present an innovative MAC protocol (Q-MAC) that minimizes the energy consumption in multi-hop wireless sensor networks (WSNs) and provides quality of service (QoS) by differentiating network services based on priority levels. The priority levels reflect application priority and the state of system resources, namely residual energy and queue occupancies. The Q-MAC utilizes both intra-node and inter-node...
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