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cell Global Id in InitialDp of IN system

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hoangsonk49
cell Global Id in InitialDp of IN system

I'm decoding some information from Camel packet of IN system in GSM telecom services.

[1]. I found a cell id in the InitialDp message with name: ***: 54:f2:10:c3:5e:ef:a2

From this, we can have *** and ***. But i don't know this is *** of what? The *** of the cellphone or the last node in the network ? Please help me if you have any experience in field of IN system. Thank you so much!

[2]. I found the message *** from IN system to MSC with the sub-information "***" = ***. So, is this value of ***the Id of the announcement which is played to subscribers when they heard something like "Your balance is not enough to ..."

Edited by: hoangsonk49 on 04/25/2015 - 04:36
mlntdrv
mlntdrv's picture
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[1] This is the ID of the cell or SA where the phone is located. I am pasting the ASN.1 of the field, hope you can read them:
CellGlobalIdOrServiceAreaIdOrLAI ::= CHOICE {
cellGlobalIdOrServiceAreaIdFixedLength [0] CellGlobalIdOrServiceAreaIdFixedLength,
laiFixedLength [1] LAIFixedLength
}

CellGlobalIdOrServiceAreaIdFixedLength ::= OCTET STRING (SIZE (7))
-- Refers to Cell Global Identification or Service Are Identification
-- defined in 3GPP TS 23.003.
-- The internal structure is defined as follows:
-- octet 1 bits 4321 Mobile Country Code 1st digit
-- bits 8765 Mobile Country Code 2nd digit
-- octet 2 bits 4321 Mobile Country Code 3rd digit
-- bits 8765 Mobile Network Code 3rd digit
-- or filler (1111) for 2 digit MNCs
-- octet 3 bits 4321 Mobile Network Code 1st digit
-- bits 8765 Mobile Network Code 2nd digit
-- octets 4 and 5 Location Area Code according to 3GPP TS 24.008
-- octets 6 and 7 Cell Identity (CI) value or
-- Service Area Code (SAC) value
-- according to 3GPP TS 23.003
LAIFixedLength ::= OCTET STRING (SIZE (5))
-- Refers to Location Area Identification defined in TS 3GPP TS 23.003 [17]
-- The internal structure is defined as follows:
-- octet 1 bits 4321 Mobile Country Code 1st digit
-- bits 8765 Mobile Country Code 2nd digit
-- octet 2 bits 4321 Mobile Country Code 3rd digit
-- bits 8765 Mobile Network Code 3rd digit
-- or filler (1111) for 2 digit MNCs
-- octet 3 bits 4321 Mobile Network Code 1st digit
-- bits 8765 Mobile Network Code 2nd digit
-- octets 4 and 5 Location Area Code according to TS 3GPP TS 24.008 [35]

[2] The answer is yes.

hoangsonk49
Thanks

Hi mlntdrv,
Thank you for your answer.