1. WSN in Prague metro Martin Vaníček - CTU

2. WSN in Prague Metro Cambridge 3 - 5 September 2007 Martin Vaníček WSN installation in Prague - 1 Test site Near Dejvická metro station (~70m) 8 wireless nodes + Stargate gateway installed 5 nodes + Stargate in one ring 3 nodes along tunnel ~ 17m distance Linksys GPRS router for internet access next to Stargate Problems WSN – communication along tunnel (nodes are just on range) Internet – router or Vodafone dropping connection after certain time of not high activity and also signal strength variability as far from the station (~70m) Stargate / Linksys sometimes got hang-up / stop responding

3. WSN in Prague Metro Cambridge 3 - 5 September 2007 Martin Vaníček WSN installation in Prague - 2 Solutions: WSN – install more nodes (2-3) in each profile along tunnel (not to be implemented on this test site) Internet – Linksys update (Keep alive function) – doesn‘t work Internet – Linksys external GPRS antenna – not huge improvement in signal strength Internet – Stargate scripts update to generate more traffic – part success Internet – Linksys / Stargate move closer to the station (not implemented / decided yet) Purchase second installation set in the University laboratory to test software and/or hardware alternatives for Internet access Linksys / Stargate – implement periodic auto-restart (thinking phase)

4. Handover to P. Bennett / T. Uchimura Thank you for your attention