Allocation or scheduling of resources among various entities contending for their access is one of the fundamental problem in engineering and operations research. To design a large, scalable networked systems, scheduling algorithms are required to be computationally very simple and distributed (or message passing). In this thesis, we present a novel method to design performance optimal, simple ...

Broadband PLC systems, achieving data rates beyond 2 Mbps, which are applied to the low-voltage power supply networks to build up so-called PLC access networks, suppose to use a frequency spectrum up to 30MHz. However, the supply networks are not designed for communications and they act as antennas, producing electromagnetic radiation and causing disturbances to other telecommunications service...

This paper presents diierent approaches for the Medium Access Control (MAC) Scheme for mobile broadband systems, which aims to be a mobile extension of an ATM based network like B-ISDN. Simulation results produced with the simulation tool SIMCO3++ 11] are presented and compared with the performance of conventional MAC protocols.

The application of directional antennas in the mobile devices of wireless ad hoc networks has the potential to increase the network connectivity and capacity. However, new solutions for medium access control (MAC) are needed. This paper provides a survey and overview of recently proposed MAC protocols for this scenario. We summarize problems specific to this setup and categorize proposed protoc...

While decentralized medium access control (MAC) protocols are more popular in wireless networks, cluster based sensor networks are particularly amenable to centralized, polling based protocols. This paper presents an analytic model to evaluate the performance of a polling based MAC protocol in terms of the packet delay, buffer overflow rates and energy consumption. We show that the polling base...

This paper addresses the issue of deafness in MAC (Medium Access Control) protocols for wireless ad hoc networks using directional antennas. Directional antennas are expected to provide significant improvements over omni-directional antennas in ad hoc networks, such as high spatial reuse and range extension. Recently, several MAC protocols using directional antennas, typically referred to as di...

In order to realize real-time communication over Ethernet or fast Ethernet, one must be able to bound the medium access time within an acceptable limit. The multiple access nature of an Ethernet makes it impossible to guarantee a deterministic medium access time (hence packet delivery deadlines) to individual stations. However, one can bound the medium access time statistically by limiting the ...

The varieties of studies in the literature have been addressed by the researchers to solve security dilemmas of Mobile Ad-Hoc Networks (MANET). Due to the wireless nature of the channel and specific characteristics of MANETs, the radio interference attacks cannot be defeated through conventional security mechanisms. An adversary can easily override its medium access control protocol (MAC) and c...

This paper presents a new Time Division Multiple Access/Frequency Division Duplexing (TDMA/FDD) based Medium Access Control (MAC) protocol for broadband wireless networks, supporting Quality of Service (QoS) for real-time multimedia applications. It also gives the Call Blocking Probability (CBP), packet end-to-end delay and utilization analysis of different service classes, as they are most ess...