hi,
well, we don’t know, but the MS knows how much data needs to be transmitted.
If the user has just switched on the phone, the MS has to send a GPRS ATTACH, which is = nn bits = k RLC blocks (values which are known by MS)
if the user is uploading a file, then the MS knows the size of the file, so it will see that it is more than 8 RLC blocks.