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To: slacker711 who wrote (16887)	11/28/2001 9:38:17 AM
From: ronho	Read Replies (3) \| Respond to of 34857

Found this by a Mr Garrett on another thread. Is there any truth to this? From GSMBOX - Most wireless applications can’t run on GPRS networks Up to 43 per cent of data gets lost on GPRS networks, making it almost impossible to run conventional internet applications across them, according to the first independent trials. The new high-speed GPRS data networks are just starting to be launched in volume for consumers and businesses, but they're not as efficient as had first been hoped, according to trials from mobile software company FlyingSPARK. Their surveys of radio networks showed that while GPRS coverage is almost universal, the performance of the networks is far from perfect. Up to 43 per cent of data packets got lost on the way from the radio terminal to the mast, and the latency - or the delay between a request and a response - was up to five seconds. Conventional applications based on the TCP protocol that underpins wireline internet can't cope with these tough wireless conditions. Most TCP connections will have timed out after five seconds, and most wireless applications, such as those used by travelling salesmen and field service professionals, are built on TCP. The TCP applications examined, such as WAP over GPRS, have had serious reliability problems. FlyingSPARK has developed its own alternative protocol, based on the much simpler UPD standard, which copes better with the rigours of the wireless environment. Keith Day of FlyingSPARK said: "TCP involves a hell of a lot of to-ing and fro-ing which is fine in a wireline environment but hopeless for wireless. In a wireless environment all that has to be paid for. "We've built a protocol that cuts most of that to-ing and fro-ing out by managing the connection intelligently at either end." FlyingSPARK expects to announce a deal with one of the major UK wireless operators shortly. uk.gsmbox.com ---------- We should know over time how credible this story is - but it's certainly spreading... GSMBOX is a well-followed UK reviewer of GSM/GPRS handsets and services. Perhaps the limitation to TCP/IP applications, or a fully free rural network, explains Mr. Walliker's noted success...