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Technology Stocks : Nokia (NOK)

NOK 6.270

-1.4%

Dec 12 9:30 AM EST

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To: JohnG who wrote (11587)	5/16/2001 8:52:19 AM
From: JohnG	Read Replies (3) of 34857

GPRS requires costly non-standard routers to patch packet data defficiencies. <<< why are they needed >>> GPRS needs two proprietary protocols in its packet data services, one is SNDCP, which is used to multiplex multiple PDP simultaneously used by on connection, the other is LLC, which is to maintain the logical link between MS and SGSN. So for SGSN to work properly, the router got to have the special ability to handle those. In contrast, 1x is using ppp as its logical link layer protocol for the connection between the handset and the PDSN router, therefore nothing special is needed. The reason LLC and SNDCP is needed is purely out of GSM's inability to handle packet data therefore you need all kind of patch and tweak to try to make it work. On the other hand, CDMA, via IS-707, has a much more elegant way in handling the packet data service.

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