Demonstration of BSTTS^TM vs Ethernet Performance

Operation

This applet is designed to show the performance gain achieved by using BSTTS^TM rather than Ethernet in ad hoc networks.

• To see the demo with default settings, click Start
• To change the throughput demand, click Rate. In the dialog box, enter a value between 0.1 and 3, this being the proportion of the available bandwidth demanded by the message traffic requests.
• To reset the parameters to nominal, click Reset
• To preset the queues to a normal state before running, click Preset

What you are seeing:

The two main diagrams illustrate the utilization of the broadcast medium bandwidth for two different data layer management techniques:

• On the right, a conventional Ethernet IEEE 802.3 scheme implementing Carrier Sense Multiple Access with Collision Detect (CSMA/CD) to control access to the medium.
• On the left is the behavior of the new Branched Space-Time Transmission System (BSTTS^TM), an innovative approach to intelligent bandwidth management system currently in the process of patent approval in the US and with the WIPO as noted below.

The inset diagrams show the medium as viewed by each station - a solid color when that station is transmitting, a faded color when receiving from other stations.  It also includes statistics for each station of the messages successfully sent, the queue length at that station, the number of collisions that gave occurred for that station and the backoff level.

For illustration purposes, each system is attempting to deliver 70 word messages across a shared medium.  As expected, at non-trivial throughput demand, the Ethernet system has two disadvantages: 

• the pad (the gray area) required to protect the message across 2*the network diameter.  In this case, we use the actual minimum diameter.
• collision that invalidate the delivery of at least two messages, and
• the back-off period during which, in many cases, the bandwidth lies idle while thre are messages in the queues ready to send.

In contrast, the BSTTS^TM behavior shows that the only times the bandwidth is not effectively utilized are:

• the inevitable propagation delay between stations - 27% of the total bandwidth with the small messages used here for illustration.  Clearly, with large, practical sized messages, this lost percentage becomes vanishingly small, and
• when the queues are empty due to message starvation.

Ownership

The BSTTS^TM technology demonstrated here is owned by Abidanet LLC, and protected by

site hosted by Startlogic.com

© 2005 Dynamic Master Systems, Inc.

last updated 2/18/2008 by David Smith