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Recently, the application range of WBAN has been gradually expanding due to the advanced wireless telecommunication techniques and the activated ubiquitous environment. WBAN is a network environment in which various types of medical or non-medical signal created directly or indirectly in and out of the body are measured and processed for transmission to various mobile device nearby. The MAC protocol...
Machine to machine communication (M2M) or machine type communication (MTC) facilitates communication without any human intervention. These applications will support an enormous number of stations (STAs). To mitigate degradation of the throughput and delay performance in wireless local area networks (WLAN) that employ carrier sense multiple access collision avoidance (CSMA/CA) protocol with request...
In the application of target tracking based on dynamic convey tree-based collaboration (DCTC) in wireless sensor networks, collisions and interferences among nodes pose a challenge for data aggregation. In this paper, we refine slot allocation to the nodes in dynamic convey tree and design an energy efficient MAC protocol called D-TDMA, which avoids collisions and interferences and allocates contiguous...
By analyzing the data transmission Collisions for wireless sensor networks, due to the shortage of energy efficiency and latency in MAC protocol, we propose a distributed TDMA scheduling protocol based on coloring algorithm (TDMA-CA), which uses spatial reuse of transmission channel. It allocates different colors for conflict nodes in the networks, and arranges distinct slots for data transmission...
The MAC problem in a wireless network has intrigued researchers for years. The MAC protocol is also important for airborne ad hoc network in order to reducing TDMA overhead, increasing TDMA throughput, and decreasing End-to-End delay. Our proposed Token Cycle Scheduling described in this paper allow the exchange of control information in an efficient and contention free manner such that each participating...
A novel MAC protocol is named beforehand bandwidth reservation (BBR) based on reserve the empty slots in the next big-slot cycle is proposed for OBS ring networks by control channel. To evaluate optimal utilization of channel bandwidth under unbalance traffic scenario, this paper studies packet scheduling based on statistic TDM scheme to allocate the idle slots. For achieving best performance, the...
A key feature in the design of any MAC protocol is the throughput it can provide. In wireless networks, the channel of a user is not fixed but varies randomly. Thus, in order to maximize the throughput of the MAC protocol at any given time, only users with large channel gains should be allowed to transmit. In this paper, a compressive sensing based opportunistic protocol for exploiting multiuser diversity...
TDMA has been proposed as a MAC protocol for wireless sensor networks (WSNs) due to its efficiency in high WSN load. However, TDMA is plagued with shortcomings; we present modifications to TDMA that will allow for the same efficiency of TDMA, while allowing the network to conserve energy during times of low load (when there is no activity being detected). Recognizing that aggregation plays an essential...
One of the fundamental differences between the terrestrial radio frequency (RF) signal and underwater acoustic signal is long propagation delay. This paper is contented with a MAC protocol for underwater sensor networks (USN) in which there are n sensor nodes in a transmission range W . Long propagation delay of the acoustic signal causes a serious problem for MAC protocol. If every sensor node has...
In cognitive radio systems, cooperative spectrum sensing in the physical layer is highly desired to detect the primary user accurately and to guarantee the quality of service (QoS) of the primary user. Due to the energy consumption in sensing the channels, the selfish users may not be willing to contribute to the cooperative sensing while they want to occupy more idle channels observed. To deal with...
OBS ring networks inherently suffer from the resource contention due to the limited network resources and the one-way reservation. Multiple tokens with the help of control information table (CIT) have been applied to avoid the source and wavelength collision. However, the receiver collision cannot be completely avoided as tokens are processed in a distributed manner. In round-robin (RR) queue selection...
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...
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...
In this paper a cross-layer scheduling and slot allocation scheme is proposed, which takes into account both the powerline channel conditions and the delay requirements of multimedia users in order to make slot reservations. The proposed mechanism aims at providing both fairness and efficient slot utilization, since the available free slots are shared proportionally between the contending users of...
The following topics are dealt with: IP network security; wireless security; network topology; power line communication; intelligent transportation; cryptography; P2P streaming; wireless communication; wireless channel; network traffic; routing protocol; security protocols; resource management; ad hoc network; wireless sensor network; MAC protocol; power control; QoS; scheduling; coding; modulation;...
This paper presents an energy-saving multi-ring cyclic scheduling for spatial-TDMA (MRSTDMA). We design a cyclic scheduling of STDMA to realize the energy-saving property of STDMA and overcome the drawbacks of STDMA - reducing TDMA overhead, increasing TDMA throughput, and decreasing end-to-end delay. Besides energy-saving mechanisms, there are initial slot assignment, joining of node, exiting of...
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