| LS | Title | From | To | Approval date |
| ETSI ISG NFV-(23)000141-LS31 | LS/r on the creation of a new work item “Requirements and framework of network function enhancements of IMT-2020 networks and beyond from the energy efficiency perspective” (SG13-LS78) | ETSI ISG NFV | SG13; | 2023-07-05 |
| SG5-LS68 | LS/r on consideration of a new work item “Requirements and framework of network function enhancements of IMT-2020 networks and beyond from the energy efficiency perspective” (reply to SG13-LS78) | SG5 | SG13; 3GPP TSG SA1; 3GPP TSG SA5; NGMN Alliance; ETSI NFV; SG11; | 2023-06-23 |
| 3GPP TSG SA5-234547-LS44 | LS/r on Information and request of advice on the SG13 plan to initiate a new work item on "Requirements and framework of network function enhancements of IMT-2020 networks and beyond from the energy efficiency perspective" (SG13-LS78) | 3GPP TSG SA5 | SG13; 3GPP TSG SA1; NGMN Alliance; ETSI ISG NFV; SG5; SG11; | 2023-05-26 |
| SG13-LS78 | LS on Information and request of advice on the SG13 plan to initiate a new work item on "Requirements and framework of network function enhancements of IMT-2020 networks and beyond from the energy efficiency perspective" at its 23 October - 3 November 2023 meeting | SG13 | 3GPP TSG SA1; 3GPP TSG SA5; SG5; NGMN Alliance; ETSI ISG NFV; SG11; | 2023-03-24 |
