NAS : Operator Specific PCO
The purpose of this tutorial is to show you how to send Operator specific information in PCO (Protocol Configuration Option). Usually PCO is requested by UE and the requested information is provided by Network through NAS signaling message as below.
[LTE]
PDN Connectivity Request (PCO Request)
Activate Default EPS Bearer Request (PCO Information)
[NR]
PDU session establishment request (PCO Request)
PDU session establishment accept (PCO Information)
In case of most of PCO elements, Amarisoft core network provide the information based on PCO request from UE, but for Operator Specific PCO the corenetwork send predefined information without request from UE.
Table of Contents
- NAS : Operator Specific PCO
Test Setup
Any callbox configuration that support one or more cell would be good enough for this test.
Key Configuration Parameters
Followings are important configuration parameters for this tutorial. You may click on the items for the descriptions from Amarisoft documents.
- operator : In this link, you will get the descriptions for all the parameters below
- id
- plmn
- value
- force
Configuration
You can use any of LTE configuration for this tutorial (e.g, enb.default.cfg).
I used mme-ims-pco-op.cfg which is copied and modified from mme-ims.cfg
Test 1 : Operator Specific Information
In this test, I will configure in such a way that eNB send Operator Specific Information on PCO regardless of whether UE request it or not.
Configuration
Add following configuration in mme-ims-pco-op.cfg
In this tutorial, I am adding the operator specific PCO in 'internet' APN, but you can add it to any APN/PDN you want. Once you decided on which APN you want to add the operator specific PCO, add the configuration parameter operator : [ ] and specify the details in it. In this tutorial, two items are added and each item is made up of the fields : id, plmn, value and force. If you set the parameter 'force' to true, the specified PCO is transmitted regardless of whether UE request it or not.
Perform the Test
Check the cell configuration and confirm it is configured as intended.
Power on UE and wait until it get an IP address.
Check in the log and confirm that the Operator specific information is configured in the PCO. You would see the operator specific data with Protocol ID and Data in PCO of Attach Accept message.
