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noselasd at fiane.dyndns.org noselasd at fiane.dyndns.orgOn 06/10/2013 06:33 PM, ☎ wrote: > Hi all. > > I've problem reading umts standard etsi ts 125.331 - for example 10.2.11 DOWNLINK > DIRECT TRANSFER does not specify length of "message type" or "rrc transaction id", it > only references 10.3.3.36 which do not specify length as well - only "Integer > (0..3)". Where do I look up the actual bit lengths? > > As far as I recall in gsm spec it was given right away. > > I've tried to read asn in wireshark/asn1/rrc but got myself only same "Integer > (0..3)" and attempt to read generated code makes my brain reboot. > > I've tried to compile it with erlc and use parsers as is but hit "function not > exported" - I don't know enough erlang yet to fix this. The protocol is specified in ASN.1. However ASN.1 can be encoded in different ways. RRC is encoded using unaligned PER , so refer to X.691 and other relevant ASN.1 specs.