Content for  TR 22.851  Word version:  19.1.0

Operators 1 and 2, both licensed to operate a 4G network and a 5G network share the 5G part of the radio access network in some areas of the country. The Public Safety Agency sends the PWS message in a certain area covered by NG-RAN1 and RAN2 of Operator 1 and Operator 2 respectively and by the shared NG-RAN area of Operator 1 and Operator 2.

• Operator 1 owns NG-RAN 1 which is not shared.
• Operator 2 owns RAN 2 which is not shared.
• NG-RAN is a shared NG-RAN between Operator 1 and Operator 2.
• Operator 1 is the hosting operator.
• Operator 2 is a participating operator. Operator 1 and Operator 2 share NG-RAN in an indirect sharing method.
• Operator 1 has a regulatory obligation to broadcast PWS message to all UEs operating on NG-RAN 1 and NG-RAN.
• Operator 2 has a regulatory obligation to broadcast PWS message to all UEs operating on NG-RAN and RAN 2.
• UEs operating in NG-RAN 1 or RAN 2 may handover to NG-RAN during the period the PWS message is periodically rebroadcasting.
• UEs subscribed to Operator 1 operating in NG-RAN may handover to NG-RAN 1 during the period the PWS message is periodically rebroadcasting (and vice versa).
• UEs subscribed to Operator 2 operating in NG-RAN may handover to RAN 2 during the period the PWS message is periodically rebroadcasting (and vice versa).

1. The Public Safety Agency (PSA) sends the PWS message in a certain Shared NG-RAN radio coverage area designated by the PSA where Operator 1 and Operator 2 share the RAN access.
2. Operator 1 and Operator 2 both broadcast the PWS message in the area covered by their respective not shared RAN they have regulatory obligations (NG-RAN 1 and RAN 2).
3. The UEs served by NG-RAN 1 and RAN 2 receive the warning message from their corresponding operating radio access.
4. The UEs served by Shared NG-RAN of the hosting Operator 1 receive the public warning message created for the specific region which is covered by NG-RAN.

For UEs subscribed to unshared accesses NG-RAN 1 and RAN 2, the public warning message can only be received by UEs subscribed to these operators owning the access. UEs served by Shared NG-RAN receive the public warning message issued by the PSA in the radio coverage area of the Shared NG-RAN designated for the warning message. The UEs only display one copy of the PWS message according to and regardless of the RAN it is operating in or may handover to. The UEs present new content of public warning messages after entering and leaving the shared network.

See TS 22.101. 28.2.5 PWS support of Shared E-UTRAN/NG-RAN A Participating Operator potentially has regulatory obligations to initiate the broadcast of PWS messages regardless of E-UTRAN/NG-RAN sharing. The following requirements apply: The shared E-UTRAN/NG-RAN shall be able to broadcast PWS messages originated from the core networks of all Participating Operators. 28.3.5 PWS support of Shared GERAN or UTRAN A Participating Operator potentially has regulatory obligations to initiate the broadcast of PWS messages regardless of GERAN or UTRAN sharing. The following requirements apply: The shared GERAN or UTRAN shall be able to broadcast PWS. Identifying, changing, and adding appropriate functionality in the network will definitely lead to a better shared-network operation.

[PR 5.8.6-001] [PR 5.8.6-002]