Mobility in wireless sensor networks poses unique challenges to the Medium Access Control (MAC) protocol design. Previous MAC protocols for sensor networks assume static sensor nodes and focus on energy-efficiency. In this paper, we present MMAC, a mobility-adaptive, collision-free MAC protocol for mobile sensor networks. MMAC caters for both weak mobility (e.g. topology changes, node joins and...

In this paper, we propose an optical burst switching architecture in time division multiplexed wavelength-routing networks, in which an edge OBS node requests time slots necessary to optical bursts to the time division multiplexed wavelength-routing network. Our scheme is attempt to improve the burst contention resolution and optical channel utilization.

Multihop Packet Radio Networks (MHPRN) is an alternative for reliable rural data transmission where no telecommunication infrastructures exist. A key issue in designing such networks is the selection of Medium Access Control (MAC) strategy. Spatial TDMA is a MAC protocol proposed for MHPRN where links are pre-assigned time-slots according to a schedule in such way that interference is avoided a...

This article studies the efficiency of backoff algorithms. The fraction of channel time devoted to successful transmissions is maximized when the stations choose the optimal transmission probability. The binary exponential backoff algorithm does not come close to optimal channel efficiency, thus a new backoff mechanism that attains near-optimal efficiency is proposed. This algorithm is called D...

This paper proposes a fuzzy logic control based dynamic channel allocation (DCA) to ECMA-368 based WiMedia UWB networks, which aims to support mixed high-quality video traffic and shipboard control data traffic with high reliability and priority as well. The DCA method applied in this paper is to flexibly vary the portions of time slots of either the prioritized contention access (PCA) or the d...

Techniques where a stereo or a multichannel signal is decomposed into spatial source-labeled time-frequency slots by level, time-difference, and coherence metrics have become popular in recent years. Good examples are binaural cue coding and up/downmixing techniques. In the article, we will provide an overview and discuss parallel approaches in the field of array processing and blind source sep...

Unified performance analysis is carried out for amplify-and-forward (AF) multiple-input-multipleoutput (MIMO) beamforming (BF) two-way relay networks in Rayleigh fading with five different relaying protocols including two novel protocols for better performance. As a result, a novel closedform sum-bit error rate (BER) expression is presented in a unified expression for all protocols. A new close...