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IEEE 802.11ah is a new Wi-Fi draft for sub-1Ghz communications, aiming to address the major challenges of the Internet of Things (IoT): connectivity among a large number of power-constrained stations deployed over a wide area. The new Restricted Access Window (RAW) mechanism promises to increase throughput and energy efficiency by dividing stations into different RAW groups. Only the stations in the...
Delay-Tolerant Sensor Networks (DTSN) experience long, unpredictable latency under fluctuating wireless networks with intermittent connectivity. Energy consumption and throughput improvement are essential in the design of MAC for DTSNs. However, when latency is relaxed in DTSN environments, traditional metrics such as throughput and energy consumption cannot express the transmission efficiency and...
Licensed-assisted access (LAA), which conveys control signal via licensed anchor carrier and data information via both licensed and unlicensed bands, is a promising solution to enhance the throughput of wireless communications. In view of the potential impact on the incumbent services in the unlicensed band, how to design the medium access control (MAC) protocol for LAA system to make fair and friendly...
In this paper, we propose and analyze a new TDMA-based cooperative MAC scheme for the two-way two-hop relay network in which there are several helpers besides a default relay node. The proposed scheme is based on the TDMA-based cooperative relaying MAC (CR-TDMA), which is designed for one-way relay networks, and thus is named as two-way CR-TDMA (TW-CR). As the main contribution of this paper, we derive...
Smart meters are being deployed worldwide on a trial basis and are expected to enable remote reading and demand response among other advanced functions, by establishing a two-way communication network. However, it remains to be determined as to how these meters would transmit their data to an aggregation point. Our paper employs a medium access control (MAC) protocol for a cooperative network to address...
In this paper, we propose a multi-channel full-duplex Medium Access Control (MAC) protocol for cognitive radio networks (MFDC-MAC). Our design exploits the fact that full-duplex (FD) secondary users (SUs) can perform spectrum sensing and access simultaneously, and we employ the randomized dynamic channel selection for load balancing among channels and the standard backoff mechanism for contention...
It has been shown in the literature that Network Coding (NC) can boost the performance of wireless networks. However, to really obtain the potential gain of NC, efficient Medium Access Control (MAC) protocols that operate with awareness of the NC functions are necessary. In this paper, we propose a novel NC-aware MAC protocol for IEEE 802.11 wireless networks that combines k-batch transmissions and...
Wireless Sensor Network (WSN) are primarily battery operated. Due to deployment of WSN in harsh environment, of WSN in harsh atmosphere, it's terribly tough to interchange or recharge the battery. So to enhance the lifetime of WSN, it is very essential to reduce energy consumption. non-identical traffic patterns of WSN plays a vital role in the power consumption. Time Adaptive Hybrid MAC (TAHMAC)...
With the emergence of self-interference cancellation techniques, wireless full-duplex communication at the same frequency channel and time slot has become possible. The gain of full-duplex communication over half-duplex depends on the success of self-interference cancellation or the amount of residual self-interference. In this paper, we propose a medium access control (MAC) protocol, named Synchronized...
In this paper, an optimal link selection and data rate assignment algorithm for spatial time division multiple access (STDMA) medium access control (MAC) protocols is exploited. The motivation for this study is jointly searching for optimal links and corresponding rates in simultaneous transmission environments in order to maximize the throughput capacity in each time slot. A mathematical formulation...
In this paper, we propose a new Medium Access Control (MAC) protocol for Wireless Sensor Networks (WSNs) called MMSMAC (Multi-Mode Sensor MAC protocol), which can operate and switch among three modes: synchronous, asynchronous, and hybrid, according to the application requirements. In the synchronous mode, MMSMAC organizes the sensor nodes under even and odd clusters. Each sensor node has its own...
Game-theory based carrier sense multiple access (CSMA) protocols for wireless networks have recently emerged as a competitive alternative to classical CSMA based medium access control designs. The advantage of game-theory based approaches lies in the scope of precise mathematical analysis and hence predictable performance compared to approaches based on ad-hoc arguments and heuristics. In this poster,...
Wireless Adhoc networks are deployed in emergency situations, military kind of applications, surveillance monitoring and in healthcare industry. The Nodes are dynamic and can accommodate themselves in any existing infrastructures, placed randomly in the network. Every node can easily communicate with any other node through the base station directly. Since entire node communicates simultaneously there...
This paper proposes a cognitive access of media with power control for unlicensed users through switching (CAMPUS), a scheme to overcome spectrum scarcity and to allow secondary users (SUs) to access a channel when coexisting with primary users (PUs). CAMPUS is a novel hybridization of interweave and underlay transmissions for spectrum access and management. Under this scheme, SUs sense the operating...
This paper proposes novel multiple access schemes for a swarm of Unmanned Aerial Vehicles (UAVs). In a super dense aerial sensor network, small UAVs communicate and transmit data from one to another, and thus leading to unavoidable packet collisions among actors. In light of that, this work introduces a novel proposal of multiple access scheme based on a hybrid collision coordination technique, a...
As one of the significant driving forces of the future broadband heterogeneous networks (5G), the Next Generation WLAN (NGW) has been initiated following the 802.11 HEW (High-Efficiency WLAN) study group with a focus on improving spectrum efficiency and area throughput. However, Low-Rate-Links (LRLs) severely degrade the overall wireless network performance, particularly under the dense environments...
Multi-gigabit-per-second data rates in millimeter-wave networks can result in an excessive amount of channel accesses. Transmitting a single packet at such rates often only requires a few microseconds. In contrast, the medium access control (MAC) overhead is about 20× larger. This is particularly harmful if one or more nodes are deaf due to the use of directional antennas. Deaf nodes cannot overhear...
As one of the significant driving forces of the future broadband heterogeneous networks (5G), the Next Generation WLAN (NGW) has been initiated following the 802.11 HEW (High-Efficiency WLAN) study group with a focus on improving spectrum efficiency and area throughput. However, Low-Rate-Links (LRLs) severely degrade the overall wireless network performance, particularly under the dense environments...
In this paper, considering the mobility of the sensor network, a novel mobility aware medium access control protocol is discussed, which applies to the problem of utilizing mobile nodes to collect data from underwater sensor networks. The proposed underwater mobility aware medium access (UW-MMAC) protocol, based on a hybrid of random and deterministic access, can be divided into two phases. The first...
Recently underwater acoustic sensor networks with autonomous underwater vehicles (AUVs) have been applied in various areas, such as ocean data collection, marine environment monitoring and military surveillance, which static networks can hardly accomplish. In order to achieve the missions, effective communication is crucial and needs the guarantee of medium access control (MAC) protocol, which schedules...
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