RE: [OSS_ASN1] [ASN1] ASN.1 Parameterized Types... pls help

Fri, 01 Oct 2004 06:10:31 -0700

I had this fun task back in GSM phase 1 days 1989-90. From my memory:
 
The "Arles France 1990" version of ASN.1 came at our rescue introducing info objects
instead of ASN.1 macros. This became "ASN.1-1994".
 
If you go with a MAP spec where you have info objects instead of macros you have
a good starting point.
 
You then need to update your TCAP spec so it contains the definition of the
OPERATION and the ERROR info objects classes, and then it must refer to the MAP
instances of these Info object classes.
 
Do not blend the TCAP and MAP specs. No need for that. You should compile first
the TCAP and then the MAP. Your compiler should be able to handle several modules,
also this case where one module contains the info object classes and the other
contains the instances (the actual MAP info objects).
 
Pls. correct me if I am wrong on this !
 

Steen Oluf Karlsen

Independent Telecom Consultant 1993-2003

Nat. Sc. Teacher 2003..
Søholtvej 6
Vester Vandet
DK-7700 Thisted
Danmark
Tel +45 97 97 72 72
email [EMAIL PROTECTED]

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]On Behalf Of Casper
Sent: 1. oktober 2004 06:17
To: 'William H. Skelton'; [EMAIL PROTECTED]; [EMAIL PROTECTED]
Subject: RE: [OSS_ASN1] [ASN1] ASN.1 Parameterized Types... pls help

Hi William,

 

Thanks for the advice.

 

This is for a R&D project. We plan to look at the feasibility of using Erlang/OTP platform for development. Currently doing investigation on ASN.1 compiler on Erlang. I’m very new to ASN.1, so find it difficult to capture some parts of the specification. The GSM/UMTS MAP ASN.1 spec is alright. But I couldn’t still figure out how to use TCAP ASN.1 spec can generate the TCAP Begin, Continue, End, etc message encoding/decoding functions.

 

With help from some generous people out there, I could understand that I will have to create the ASN.1 spec of mine or find a standard spec, which will Instantiate the Parameterized Type specified in the TCAP. If you could point me to a standard spec like that or give me a sample how I could write something like that, would be very helpful. How to blend the MAP and TCAP ASN.1 specs?

 

Thanks!

Eranga

 

 

 

From: William H. Skelton [mailto:[EMAIL PROTECTED]
Sent: Friday, October 01, 2004 3:12 AM
To: [EMAIL PROTECTED]
Subject: Fwd: [OSS_ASN1] [ASN1] ASN.1 Parameterized Types... pls help

 

Hi Eranga,

We found you can avoid some of the problems by using earlier TCAP specifications, which are fully compatible (I think), but simpler.

Just as a matter of interest, is this a commercial or university project you are working on?  Are you building your own tools?

William


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Subject: [OSS_ASN1] [ASN1] ASN.1 Parameterized Types... pls help
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Hi All,
 
I'm finding difficult in absorbing "How to use ASN.1 TCAPMessage to transport GSM MAP". The problem is how to generate TCAP Begin, Continue, End, etc messages.
 
I read about the ASN.1 Parameterized Type, but still I could find the match of ASN.1 specs for MAP and TCAP. I thought below might be the way, but still that gives some compilation errors.
 
mapSpecificAS ABSTRACT-SYNTAX ::= {
  MapSpecificPDUs
  IDENTIFIED BY  gsm-MessagingId
}
 
MapSpecificPDUs ::=
  TCMessage{{ MAPOperations-Invokable}, { MAPOperations-Returnable}}
 
 
MAPOperations-Invokable OPERATION ::=
      {sendRoutingInfoForSM | mo-ForwardSM | mt-ForwardSM}
MAPOperations-Returnable OPERATION ::=
      {reportSM-DeliveryStatus | alertServiceCentre | informServiceCentre | readyForSM}
 
The error is as below (Erlang ASN.1 compiler),
      {error,{asn1,[{error,{type,57,
                           'TCAPMessages',
                           'MapSpecificPDUs',
                           {asn1,{duplicates_of_the_tags,
                                     [{'UNIVERSAL','INTEGER'}]}}}}]}}
 
For your information, I have attached TCAPMessages.asn and MAP-ShortMessageServiceOperations.asn.
 
I appreciate if anybody out there can give me some clue to solve this problem.
 
Thanks in advance!
Eranga


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