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Sylvain Munaut 246tnt at gmail.comOn Fri, Nov 20, 2009 at 1:49 PM, Harald Welte <laforge at gnumonks.org> wrote:
> On Wed, Nov 18, 2009 at 10:37:37PM +0000, 246tnt at gmail.com wrote:
>> When making a call from my test phone (a T610 here), I see the BSC
>> assigning more than one channel ...
>
> yes, this is due to the fact that we do not check for the request reference.
>
> when your MS transmits the first RACH burst, it selects a particular request
> reference. all retransmissions carry the same request reference.
Nope, they dont. In gsm 04.08 3.3.1.1.1 about the RACH bursts they says :
"a random reference which is drawn randomly from a uniform probability
distribution for every new
transmission."
And that's why I observe, the "ra" is different for each try. But
those attemps are _very_ close to each other, not time for the BSC to
respond.
Sylvain