In this paper we consider a slotted multi-hop wireless network, where a source transmits continuously data to a destination node, through a route composed of multiple relays which are randomly distributed over a line. The problem of interference among separate nodes in the route is addressed. We propose a novel Medium Access Control (MAC) protocol, named Prioritybased Carrier-Sense Multiple Acc...

The increasing demand for mobile radio services and the scarce bandwidth available suggest to devote considerable research eeorts to nd more eecient multiple access techniques in order to improve the system capacity. In this work we compare the system performance of three mobile radio systems: the well known TDMA system, which is the basis of the European GSM, the recent CDMA system (a standard...

We study distributed choice of retransmission probabilities in slotted Aloha under power di erentiation. We consider random transmission powers and further study the role of priorities (through power control) given either to new arriving packets or to backlogged ones. We study both the cooperative team problem in which a common objective is jointly optimized as well as the noncooperative game p...

Simple analytic estimates and corresponding error bounds are provided for communication or broadcast systems with state dependent message loss probabilities, such as slotted ALOHA loss systems.

Compelling features such as low power consumption and complexity make LoRaWAN one of the most promising technologies to provide long-range connectivity resource-constrained devices. However, suffers from limited scalability since it uses an Aloha-based protocol for accessing channel that causes a huge amount frame collisions when number devices (or network load) is high. This paper presents LFS...

We address the problem of fair medium access control in multi-hop Aloha networks, with the objective of achieving proportionally fair rates. We consider a general multi-hop wireless network, and show how the attempt probabilities/attempt rates in Aloha protocols should be set so that the achieved rates are globally proportionally fair. For both slotted and unslotted Aloha, we argue that it is p...

In this paper, we develop a novel mathematical model to estimate the probability distribution function of the number of tags discovered after a certain number of interrogation rounds. In addition, the pdfs of the number of rounds needed to discover all the tags are also calculated. The estimation of such pdfs will be helpful in estimating the number of interrogation rounds and the optimal param...

The throughput and delay characteristics of a landmobile satellite channel are analyzed for both slotted ALOHA and slotted direct-sequence CDMA (code division multiple access), using binary phase shift keying (BPSK) modulation and forward error correction coding (FEC). In the case of CDMA, the application of path diversity techniques-maximal ratio combining and selection diversity-is also taken...

Michele Zorzi and Ramesh R. Rao Abstract—In this paper, we consider the slotted ALOHA protocol with capture, in a mobile communication environment, in the presence of Rayleigh fading and log-normal shadowing. The capture probabilities and their asymptotic value, as the number of colliding packets tends to infinity, are computed. A sufficient condition, under which this limit is positive, is ide...