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2 Bulletin of the Polish Academy of Sciences. Technical Sciences

2 Zieliński B.

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Effective throughput of AX.25 protocol

Zieliński B.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2013

Vol. 61, nr 3

639--647

AX.25 protocol belongs to the HDLC protocols family and is used, among others, as a data link layer in an amateur Packet Radio network. The paper presents a simple analytical model developed on the basis of protocol frame exchange rules. Then, we compare analytical results to the experimental ones achieved using various different types of TNC controllers that act as network interfaces for Packet Radio network. In the experimental part we focus on both hardware and software properties of TNC that have influence on the effective throughput of the network.

Efficiency analysis of IEEE 802.11 protocol with block acknowledge and frame aggregation

Zieliński B.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2011

Vol. 59, nr 2

235-243

The article presents data transmission methods in IEEE 802.11 wireless LAN standard, including transmission efficiency improving methods like block acknowledge and two variants of frame aggregation. On the basis of their operation, an analytical model is derived which allows for estimation of protocol efficiency and effective throughput under perfect conditions for various protocol parameters. With this model, all transmission methods are analysed for their efficiency for two currently used physical layers, namely, OFDM (802.11a/g) and HT (802.11n). The calculation results are presented on graphs and discussed. Finally, so-called throughput upper limit is calculated for all the methods considered in the paper.