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To: Kent Rattey who wrote (9102)	2/3/2001 10:21:06 PM
From: Eric L	Read Replies (2) \| Respond to of 34857

re: GPRS Update Kent, << Achieving the theoretical maximum GPRS data transmission speed of 172.2 kbps would require a single user taking over all eight timeslots without any error protection. >> 172.2 kbps (unoptimized raw data speed) is as theoretical as 1xRTT at 614 kbps (and I wish CDG would update the !@#$%^& website). <g> ISDN comporable effective throughput (with optimization) was the objective. The article below is worth a read. It is pretty realistic, pretty current, pretty authoress, pretty well researched, reasonably accurate. Hope the link works. I just clipped the opening paragraph: >> Scratching the GPRS Surface 1/31/2001 Wireless Networks Online Paulo Di Maio This is supposed to be the year of GPRS implementations, but the much-expected wireless 'midband' technology that was set out to achieve around 171 kps is catching on slowly. The wealth of trials and pilots initiated over the last twelve months all over Europe has greatly titillated the expectations of the markets. According to levelheaded observers, over-hyped prospects could be disappointing. << Full text here: wirelessnetworksonline.com{DA10E171-F729-11D4-A770-00D0B7694F32} - Eric -

To: Kent Rattey who wrote (9102)	2/4/2001 2:10:12 PM
From: 49thMIMOMander	Read Replies (1) \| Respond to of 34857

>Achieving the theoretical maximum GPRS data transmission speed of 172.2 kbps would require a single user taking over all eight timeslots >without any error protection. Exactly, the original design criteria, known since late 70s. (although one funny thing is that the FSK used in GSM has an inbuilt forward error protection, although being optimal for battery life is more important) > Clearly, it is unlikely that a network operator will allow all timeslots to be used by a single GPRS user. Not at all unlikely. (Sonera already gets rid of the last telephone poles in Finland and installs GSM based phones for the same monthly, etc fees as for wired phones) > Additionally, the initial GPRS terminals are expected be severely limited- supporting only one, two or three timeslots Not limited at all, but exactly as the the system has been designed, long time ago. >The bandwidth available to a GPRS user will therefore be severely limited No, it will be the same 200kHz used for ages. > As such, the theoretical maximum GPRS speeds should be checked against the reality of constraints in the networks and terminals. What do you mean "should be checked", it has been checked long time ago. Many, many moons has passed since that, much more than you have fingers and toes. Ilmarinen. P.S. Why is GPRS so difficult to understand, one only need to process two-three factors at the same time, not even all other users nor soft-hand-offs? And the GSM operators have even more many, many moons of actual dynamic field experience from their networks, huge amounts of data. (Ever put a GSM phone in field engineering mode??)