In reservation-based multiple access protocols, before obtaining a contention-free access to the channel, a mobile terminal must wait for its request packet to be successfully sent to the base station. A pseudo-Bayesian Aloha algorithm with multiple priorities is proposed in this paper to reduce the waiting time of delay sensitive request packets in a multimedia environment. Packets are transmi...

The purpose of this work is to present realistic behaviour of Slotted Aloha (S-ALOHA), used as Request Access Channel (RACH), with good performance regarding stability, efficiency, delay and capacity of traffic control. We present modelling and simulation of those parameters, which most influence the performance in terms of stability, and efficiency of the MAC technique based on S-Aloha. Consid...

In this paper, we provide an overview of recent developments in the domain of Machine-Type Communications (MTC) for current and next-generation wireless cellular systems. We describe existing MTC standards and discuss in more detail the necessity of novel solutions for massive access of machinetype devices to the mobile cellular network. In particular, we focus on recent developments in the dom...

—The control algorithm which is in order to achieve the aim of keeping throughput stability is needed in the Slotted ALOHA(S-ALOHA) protocol. The core of the control algorithm is to derive the accurate number of nodes. The classic control algorithm suffers performance loss when the system nodes change. In this paper, we addressed a Fast Adaptive (FA) algorithm to promote the performance of ALO...

The throughput performance of slotted ALOHA (S-ALOHA) in a cellular system and Nakagami fading environment is studied. Based on the signal capture model, the effects of the multiple access interference (MAI) from in-cell users and the cochannel interference (CCI) from cochannel cells are quantified analytically. Especially considered are the cases when asynchronism of cochannel cells is present...

In reservation MAC protocols, before obtaining a contention free access to the channel, a mobile must wait for its request packet to be successfully sent to the base station. A pseudo-Bayesian Aloha algorithm with multiple priorities is proposed in this paper to reduce the waiting time of delay sensitive request packets in a multimedia environment. Packets are transmitted in each slot according...

In this paper, we propose a hybrid medium access control protocol (H-MAC) for wireless sensor networks. It is based on the IEEE 802.11’s power saving mechanism (PSM) and slotted aloha, and utilizes multiple slots dynamically to improve performance. Existing MAC protocols for sensor networks reduce energy consumptions by introducing variation in an active/sleep mechanism. But they may not provid...