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In recent years, data gathering has received significant attention as an application of Wireless Sensor Networks (WSNs). Staggered data tree based protocols have been shown to be successful in reducing energy consumption in data gathering scenarios. An important part of staggered protocols is the process of schedule construction. In order to minimize energy consumption, this process must be fast....
In wireless sensor networks (WSN), individual sensor nodes are inherently unreliable and have very limited capabilities to ensure real-time properties. In fact, one of the most predominant limitations in wireless sensor networks is energy consumption, which hinders the capacity of the network to provide real-time guarantees (e.g. low duty-cycles, low transmission range). Many approaches have been...
In this paper, we provide a general framework of distributed medium access control (DMAC) and synchronization for ad-hoc sensor networks with omni-directional antennas. Compared to existing works that focus on minimizing the energy consumption, our design objectives aim to increase the throughput, to lower the latency, and to solve hidden and exposed nodes problem in a traffic-heavy and dynamic environment...
We consider transmission scheduling by medium access control (MAC) protocols for energy limited wireless sensor networks (WSN) in order to maximize the network lifetime. Time-varying opportunistic protocol (TOP) for maximizing the network lifetime is proposed. By executing TOP each sensor exploits local channel state information (CSI) and local residual energy information (REI). TOP implements opportunistic...
From a theoretical standpoint, backpressure-based techniques present elegant cross-layer rate control solutions that use only local queue information. It is only recently that attempts are being made to design real world wireless protocols using these techniques. To aid this effort, we undertake a comprehensive experimental evaluation of backpressure mechanisms for multihop wireless networks, in particular,...
MAC protocol is the major consumer of sensor energy because it controls the activity of wireless radio of sensor nodes directly. The energy efficiency of MAC protocol makes a strong impact on the network performance. TDMA-based MAC protocol is inherently collision free, and can rule out idle listening since nodes know when to transmit. But traditional TDMA protocol is not suitable for event driven...
Temperature control is a major concern in cold chain monitoring and traceability services for the largest cause of food poisoning. Considerable work has examined the use of wireless solutions in warehouses. However, the maintaining of the chain during the transportation phase remains very crucial. In this paper, we present new wireless sensor network (WSN) solution for cold chain monitoring. This...
Typically, medium access control (MAC) protocols for wireless sensor networks implement synchronised periodic sleeping to conserve energy. We argue that (local) synchronisation between nodes is the main cause why MAC protocols do not efficiently support node mobility e.g. nodes waste valuable energy to resynchronise. In this paper, we present ideas on mobility support in schedule-based medium access...
Energy efficiency is a primordial issue in the wireless sensor networks. This is achieved by deactivating nodes when possible. In this paper we describe the MAC protocol MaCARI that synchronizes nodes in order to schedule active and inactive periods. MaCARI divides time into three periods: a synchronization period, a scheduled activities period where communications are constrained by a tree and an...
In this paper, we propose an asynchronous duty cycle adjustment MAC protocol, called ADCA, for the wireless sensor network (WSN). ADCA is a sleep/wakeup schedule-based protocol to reduce power consumption without lowering network throughput or lengthening transmission delay. It is asynchronous; it allows each node in the WSN to set its own sleep/wakeup schedule independently. The media access is thus...
Designing low energy consumption, high efficiency media access control (MAC) protocols are one of the most important directions in wireless sensor networks (WSN). In this paper, we proposed a new contention reserve MAC protocol, named CRMAC, under the inspiration of IEEE 802.15.4's superframe structure. CRMAC is a MAC protocol suitable for intra-cluster WSN that combines the advantages of contention...
We introduce the multi-channel flow-aware medium access control protocol, or (MFLAMA), an energy-efficient, schedule-based, multi-channel medium-access control (MAC) protocol designed for data gathering applications in wireless sensor networks. MFLAMA improves the channel utilization by establishing collision-free transmission schedules across multiple channels. Energy efficiency is achieved by preventing...
A wireless sensor network (WSN) is a collection of wireless mobile hosts forming nodes that are arbitrarily and randomly changing their locations and communicating without the aid of any centralized administration or standard support services. Nodes are classified as sensor nodes and routers. Some nodes act both as sensors and routers. While traditional MAC protocols must balance between throughput,...
To improve the utilization of the precious radio spectrum, we propose a channel-hopping based cognitive radio medium access control (MAC) protocol for synchronized wireless networks that can enable the secondary (unlicensed) users to opportunistically utilize the unused licensed-spectrum without interfering with the primary (licensed) users. In our proposed scheme, the secondary users switch across...
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