28 Mar
2010
28 Mar
'10
11:02 a.m.
Hello Harald,
On Sun, 28 Mar 2010 13:16:36 +0800, "Harald Welte" <laforge(a)gnumonks.org>
wrote:
as far as I know, it has to change on every retransmission. Dieter is
probably the person who knows all RACH aspects in detail, maybe he can
comment on this.
According to the specification the random value has to change on every
transmission:
a random reference which is drawn randomly from a uniform probability
distribution for every new transmission.
In the TSM30 firmware this is done by having a table with random values
and an index into the table which is initialised to a random value when
the Immediate Assignment Procedure is started and incremented with every
random number taken for a retransmission. The table has 32 values because
the random reference is not larger than 5 bits.
Best regards,
Dieter
--
Dieter Spaar, Germany spaar(a)mirider.augusta.de