Talk:Um interface

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This is the starting point for a mode complete description of GSM's air interface. It is a work in progress. DavidABurgess (talk) 16:55, 27 October 2008 (UTC)[reply]

We could use a section on Um security features. DavidABurgess (talk) 02:58, 29 November 2008 (UTC)[reply]

two things:

A5/2 is no longer implemented in recent MS I think. (see the A5/2 page and I checked on my iPhone, A5/2 doesn't work)
I think the authentication process can be encrypted by using the previous encryption get. During the location update request, the key sequence number is given and if it matches with the network they can use the previous session key.

Just a minor thing: According to 3GPP TS 05.01 V8.9.0 the guard period of 8,25 symbol time durations is at the end of a time slot. doesn't make a big difference unless you want to design a radio interface...

regards, MiKa from Vienna —Preceding unsigned comment added by 178.191.170.51 (talk) 20:17, 20 July 2010 (UTC)[reply]