Abstract
TinyTP is the IrDA transport layer protocol for indoor infrared communications. For the first time, this paper presents a mathematical model for TinyTP over the IrDA protocol stacks taking into account the presence of bit errors. Based on this model, we carry out a comprehensive optimisation study to improve system performance at the transport layer. Four major parameters are optimised for maximum throughput including TinyTP receiver window, IrLAP window and frame size, as well as IrLAP turnaround time. Equations are derived for the optimum IrLAP window and frame sizes. Numerical results show that the system throughput is significantly improved by implementing the optimised parameters. The major contribution of this work is the modelling of TinyTP including the low-layer protocols and optimisation of the overall throughput by appropriate parameter selection.
Highlights
Indoor infrared data communications, based on the Infrared Data Association (IrDA) standards, have become widely available on a large number of portable devices ranging from mobile phones and digital cameras to laptops and printers [1]
A comparison between Figures 8 and 10 shows that optimisations of IrDA link access protocol (IrLAP) window and frame size are necessary since the performance is significantly improved at Tiny transport protocol (TinyTP) level when the optimum values are used
We derive a comprehensive model for the IrDA TinyTP performance in the presence of bit error rate (BER) by considering multiple IrLMP connections and taking the underlying IrDA protocol stacks into account
Summary
Indoor infrared data communications, based on the Infrared Data Association (IrDA) standards, have become widely available on a large number of portable devices ranging from mobile phones and digital cameras to laptops and printers [1]. In [7], an IrLAP model is presented as the first significant work on the IrDA link layer. Many link layer performance evaluations and improvements have been undertaken recently to address different infrared link issues including the impact on link throughput of device processing speed [8] and future increase in data rates [9]. All the previous publications focus on link layer perfor-. We subsequently develop a mathematical model for TinyTP which allows derivation of throughput taking into account the lower IrDA protocol stack. The suitable IrLAP turnaround time is investigated for 16 Mbps links
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