A novel contention probability dynamism for IEEE 802.15.6 standard

A Novel Contention Window Control Scheme for IEEE 802.11 WLANs

In the IEEE 802.11 standard, network nodes experiencing collisions on the shared medium need a mecha‐ nism that can prevent collisions and improve the throughput. Furthermore, a backoff mechanism is used that uniformly selects a random period of time from the contention window (cw) that is dynamically controlled by the Binary Exponential Backoff (BEB) algorithm. Prior research has proved that t...

Root Contention in IEEE 1394

A Novel Mechanism for Contention-based Initial Ranging in IEEE 802.16e Networks

The paper proposes a Waiting-time Dependent Increasing rate Adapted Backoff (WDIA) algorithm to improve the contention efficiency in the IEEE 802.16e (OFDMA). A contention model is first proposed to analyze the frame-based behavior of contention resolution in 802.16e network. We introduce the concept of reduced overlapping between back-off windows of contending stations and we adopt adaptable i...

Call admission control for IEEE 802.11 contention access mechanism

This paper proposes an admission control algorithm that enables the upcoming IEEE 802.11e contention based Enhanced Distributed Channel Access (EDCA) to provide quantitative bandwidth guarantees for Wireless Local Area Networks (WLANs), rather than a relative prioritized service. The algorithm estimates the throughput that flows would achieve if a new flow with certain parameters was admitted, ...

Error Probability of Different Modulation Schemes for OFDM based WLAN standard IEEE 802.11a

Orthogonal Frequency Division Multiplexing (OFDM) is a key technique for achieving high data rates and spectral efficiency requirements for wireless communication systems. This paper presents a modeling and simulation of OFDM based on WLAN standard (IEEE 802.11a). Performance of OFDM is evaluated for different modulation schemes such as PSK, QAM, DQPSK, and OQPSK. The performance of OFDM is com...