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It is necessary to find a solution to locate the above-mentioned devices. This document aims to solve Issue#25 of the WebRTC CAMARA Group
Scenarios.
1.User calls from BYON device connected to cellular network
Introduction:
Regarding the following scenarios. The identification of the user's location cannot be done through the MSISDN parameter. This parameter is unknown in any of the scenarios.
It is therefore proposed to identify the user's location by IP address. The IP address is a private parameter and it is necessary to obtain a public IP through NAT algorithms (CGNAT converts private IP to public IP following an algorithm).
The deterministic NAT algorithm is the one that best fits our needs. From a developer's public IP, the customer's private IP can be located on the BNG or FTTH.
1.User calls from BYON device connected to cellular networkIn this mobile connection scenario, it is necessary to know the UPF node to which the user is connecting from his mobile network. The UPF is the element responsible for providing the internet gateway to operator's customers.
In the 5G standard architectures the Access and Mobility Management function (AMF) is the element in charge of managing the UE mobility within the different gNodeBs of the operator. This information of the radio cell a user is connected to, is sent to the UDM throughout the N8 interface as outlined in the 3GPP standard. However, this information is also needed by the SMF to determine the best UPF the user can connect to, this is done through the N11 interface.
In this case, the user is using BYON from his cell phone connected to the cellular network. The device has its own SIM. It is possible to locate the cell to which the user is connected.
1.1 Multisim
- If the user is making a call from a mobile phone with multisim capability, the antenna location described above may not work.
Multisim enabled devices have a primary SIM and a secondary SIM with a different phone number. The user only appreciates that there is one SIM (with a single phone number). - The localization in multisim scenario should be checked.
2. User calls from the BYON device connected to his home wifi
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The user makes a call from a device using BYN. The user is connected to the Wifi network at home. The operator can usually determine the connection originated from the home connection point.
The subscriber's address is known
3. User calls from BYON device connected to a different wifi than home wif wifi (eg. starbucks)