On Wed, 3 Nov 2004, Zemer Margolin wrote:
> Hi all,
>
> Has anyone here had to decode RRC message nested in the RRC-Container at
> the RANAP protocol ? I have tried to use “CONTAINING” but since RANAP is
> PER and RRC is UPER it is not such a good solution.
Support for this depends on the tool that you are using. For example,
with the OSS ASN.1 Tools you would change:
RRC-Container ::= OCTET STRING (CONTAINING UL-CCCH-Message)
to:
RRC-Container ::= OCTET STRING (CONTAINING UL-CCCH-Message
ENCODED BY {joint-iso-itu-t(2) asn1(1) packed-encoding(3)
basic(0) unaligned(1)} )
and when compiling you would specify -per -uper on the ASN.1 compiler
command line. The change to the subtype constraint combined with
-per -uper instructs the decoder to automatically switch to PER Unaligned
when decoding the contents of RRC-Container. The result is that in a
single call to the decoder your entire message will be decoded, even
though the main message is encoded using PER Aligned and a nested
component is encoded using PER Unaligned.
If you have questions specific to the use of the OSS ASN.1 Tools please
send them to [EMAIL PROTECTED], not to [EMAIL PROTECTED] or [EMAIL PROTECTED]
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