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We propose a Multi-Channel Pure Collective Aloha (MC-PCA) MAC protocol for asynchronous satellite uplink random access in this paper. The MC-PCA MAC protocol collects a batch of packets before selecting a channel randomly out of a number of channels and transmits these packets sequentially in the selected channel at one go. The key idea in the design of this proposed MC-PCA MAC protocol is to spread...
Vehicle-to-anything (V2X) is a promising communication technology to support operability in large-scale vehicular networks. The future deployment of V2X necessitates interworking between different access technologies, i.e., Dedicated Short-Range Communications (DSRC) and Cellular networks. However to achieve an efficient V2X interworking, we need to resolve the multi-hop issue, mainly originating...
The Asynchronous Contention Resolution Diversity Aloha with Decollision Algorithm (ACRDA-DA) medium access control (MAC) protocol for satellite uplink access is proposed in this paper. The same two or multiple replica packets from a user are transmitted in two or multiple random non-overlapping virtual slots in a virtual frame. A decollision algorithm is used to decollide up to a maximum number of...
Recently emerging wireless sensor technologies integrate different types of sensor nodes in a network for information collection. The heterogeneous Wireless Sensor Network (WSN) imposes complex design challenges as nodes in such a network often have different requirements in terms of latency and bandwidth. Therefore, the channel access for nodes needs to be managed ensuring differentiated quality...
The Tactile Internet refers to the communication networks that have a closed control loop of tactile input and audio and/or visual feedback. Example applications include telerehabilitation and virtual training. To ensure that these applications have unnoticeable latencies and thus satisfied quality-of-service and quality-of-experience requirements, the Tactile Internet needs to guarantee round-trip...
Cognitive radio (CR) is a promising method suitable for solving inefficiency spectrum policy by opportunistically identifying the vacant portions of the spectrum that are used by primary users (PUs). In cognitive radio ad hoc networks (CRAHNs), secondary users (SUs) can opportunistically utilize the spectrum that is available from PUs. In this paper, we propose a neighbor-aware distance estimated...
Recently, the 3rd Generation Partnership Project (3GPP) has standardized LTE-licensed assisted access (LTE-LAA) supporting LTE downlink carrier aggregation (CA) in the 5 GHz unlicensed spectrum. LTE-LAA technology allows LTE operators to freely use additional frequency resources in the 5 GHz unlicensed spectrum. Therefore, the problem of coexistence with other existing communication technologies in...
Due to the expansion of the unmanned aerial vehicle (UAV) market, there is the issue of spectrum scarcity for unmanned aerial system (UAS). Thus, it needs to allocate the resource effectively in the limited bandwidth considering the network environment. In this paper, we propose the frame structure and the resource allocation algorithm which can maximize the network throughput as well as satisfy the...
The diversity of IoT applications implies the requirement of reliable yet efficient MAC solutions for supporting transmissions for various traffic patterns. In this paper, we propose GoMacH, an efficient MAC protocol that provides high reliability and throughput for handling various traffic loads in IoT. GoMacH seamlessly integrates several outstanding techniques. It adopts the phase-lock scheme to...
To improve the performances of wireless sensor network (WSN) and its lifetime, the management of power consumption and the energy harvesting is crucial. In this paper, we propose an energy-harvested management mechanism (EH2M) for WSN, in order to minimize the duty-cycle on the basis of the present amount remaining energy. With EH2M, each sensor node can adjust its duty-cycle dynamically by computing...
This paper considers a media access control (MAC) scheme, which employs Reed-Solomon codes for error-correction, protocol sequences for packet scheduling, and successive interference cancellation (SIC) for demodulation. The construction of the protocol sequences is based on the Chinese remainder theorem (CRT), and a bound on the pairwise Hamming cross-correlation is established. After proving some...
Wireless sensor networks (WSNs) have been widely studied for decades due to their superior characteristics and promising applications. However, multi-hop WSNs suffer from serious collisions caused by hidden terminals, resulting in the decline of network performance and lifetime. Contention-free media access control (MAC) protocols can strictly avoid conflicts through channel resource partitioning...
Vehicular Ad hoc Network (VANET) consists of group of moving vehicles acting as nodes, establishing its own dynamic topology for packets exchange. The vehicles or the nodes are usually travelling at high speeds, resulting into a frequently varying topology. In this paper, we present performance analysis of latest IEEE standard 802.11ac in comparison with previous MAC protocols like 802.11p and 802...
With the advent of Internet of Things IoT, it is expected that the growth of Wireless Sensor Networks WSN will increase exponentially as it provides a medium for IoT to sense the real-world environment. The increase on the number WSN nodes will result in deteriorating performance at Medium Access Control MAC layer. This paper provides a review on the recent applications of Machine Learning to improve...
Due to the expected exponential growth of traffic volume in 5G-based networks, efficient mechanisms that effectively utilize the underutilized portion of wireless spectrum are needed. Opportunistic spectrum access mechanisms are designed to utilize the available licensed spectrum bands, which can be granted to unlicensed users (secondary users (SUs)) without causing harmful interference to licensed...
In recent days wireless network provides a high bandwidth support eternally for enabling a loss free communication. One amongst the standards available for high rate support in personal area network is WiMedia Ultrawideband. It provides consumer applications and products at low price consuming low energy. An effective slot allocation and scheduling method could enhance the performance of the existing...
Efficiency of MAC (media access control) is one of important issues of power line communication (PLC). There exists efficiency problem in current CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) mechanism of large-scale PLC network. Aimed to solve this problem, a Cluster and Probability Competition Based MAC (CP-MAC) mechanism is presented to improve the MAC efficiency, in which the...
The principle of attacking methods against the MAC layer of underwater acoustic network is first introduced briefly. Underwater acoustic channel characteristics are modeled corresponding Propagation Delay, Received Power and Background Noise by using OPNET pipeline stage. MAC Layer and Network Layer modules of network node are implemented. The results of a single node attack and two nodes distributed...
Vehicular ad-hoc networks (VANETs) that enable communication among vehicles have recently attracted significant interest from researchers, due to the range of practical applications they can facilitate, particularly related to road safety. Despite the stringent performance requirements for such applications, the IEEE 802.11p standard still uses the carrier sensing medium access/collision avoidance...
One key goal of Vehicular Ad-hoc Networks (VANETs) is to provide sufficient Quality-of-Service (QoS) for real-time safety applications. These applications facilitate wireless broadcast warning messages between neighboring vehicles to inform drivers on time about dangerous situations like accidents. The IEEE 1609.4 standard in DSRC defines a MAC layer implementation for multichannel operations in VANETs...
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