Re: can decode the "Transparent Container"

[Anders Broman <anders.broman () ericsson com>]

Hi,
In the frame you are giving as an example which data makes it possible to know if this is:

-          target network is GERAN

-          target network is UTRAN
A it's PS to CS I presume it can't be E-UTRAN.
Regards
Anders

From: wireshark-users-bounces () wireshark org [mailto:wireshark-users-bounces () wireshark org] On Behalf Of damker
Sent: den 25 februari 2016 10:31
To: Community support list for Wireshark
Subject: [Wireshark-users] can decode the "Transparent Container"

there are many detail informations in the ie "Source to Target Transparent Container" in message "SRVCC PS to CS 
request" and "SRVCC CS to PS Request" message which is using in SV interface,can wireshark add the future to decode the 
container?

[cid:image001.jpg@01D16FCC.3A2B41E0]

more description in ts 29.280:
6.4        Target to Source Transparent Container
The Target to Source Transparent Container contains information that shall be transferred transparently by CN entities 
from the target RAN to the source RAN.
When the target network is GERAN, the Transparent container field contains the value part of the Layer 3 Information IE 
defined in 3GPP TS 48.008 [8], i.e., octets 3 to n, excluding octet 1 (Element ID) and octet 2 (Length).
When the target network is UTRAN, this container carries the Target RNC to Source RNC Transparent Container IE defined 
in 3GPP TS 25.413 [9]. The Transparent container field contains a transparent copy of the corresponding ASN.1/PER IE 
(see subclauses 8.2.2 and 8.48 in 3GPP TS 29.274 [3]).
When the target network is E-UTRAN, the container carries the Target eNB To Source eNB Transparent Container IE defined 
in 3GPP TS 36.413 [14]. The Transparent container field contains a transparent copy of the corresponding ASN.1/PER IE 
(see subclauses 8.2.2 and 8.48 in 3GPP TS 29.274 [3]).
The receiver of this Information Element shall ignore the length of the transparent container encoded in octet 5 and 
shall derive the actual length of the container from the length encoded in octets 2 to 3 minus 1.
For backward compatibility, the sender of this Information Element shall set the octet 5 to the actual length of the 
transparent container if the size of the container is smaller or equal to 255 octets, and to the value "255" otherwise.








Bits








Octets


8


7


6


5


4


3


2


1








1


Type = 53 (decimal)








2 to 3


Length = n








4


Spare


Instance








5


Length of the Transparent container








6 to (n+4)


Transparent container






Figure 6.4-1: Target to Source Transparent Container

________________________________
damker

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