Channel Request Info RACH GSMTAP Wireshark?

dagar dagar1935 at hotmail.co.uk
Mon Aug 12 00:58:37 UTC 2013


hello, when reading gsm spec online i have understood that on an MT call the
BTS pages the phone on the RR paging channel(PCH) the phone then asks for a
channel in the RR channel request (RACH) the BTS replies with RR immediate
assignment(AGCH) etc etc

Now I have tried to see a live example of this using osmocom-bb
layer1/mobile + gsmtap/wirehshark

However I cannot figure out or see anywhere in these logs the *RR channel
request (RACH) packet*. Does GSMTAP or OsmocomBB actually capture the RR
channel request or am I missing something here??

the logs I get are like this

(CCCH) (RR) Paging Request Type 1
(CCCH) (RR) Paging Request Type 1 
(CCCH) (RR) Paging Request Type 1 
(CCCH) (RR) Paging Request Type 1 
(CCCH) (RR) Paging Request Type 1 
(CCCH) (RR) Paging Request Type 1 
(CCCH) (RR) Paging Request Type 1 
(CCCH) (RR) Paging Request Type 1 
(CCCH) (RR) Paging Request Type 1 
(CCCH) (RR) System Information Type 1
(CCCH) (RR) System Information Type 2
(CCCH) (RR) System Information Type 3
(CCCH) (SS) 
(CCCH) (RR) Paging Request Type 1 
(CCCH) (RR) Paging Request Type 1 
(CCCH) (RR) Paging Request Type 1 
(CCCH) (RR) Immediate Assignment 

and so on

Thanks!



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