| LS | Title | From | To | Approval date |
| ITU-R SG 4-Documents 4C/TEMP/107, 4B/183 | LS/r on the proposed term “multiple-input and multiple-output (MIMO)” and its definition [reply to CCT-Documents CCT/181 and CCT/189] | ITU-R SG 4 | CCT; ITU-R WP 5A; ITU-R WP 5D; ITU-R WP 6A; SG5; SG13; SG15; | 2025-11-07 |
| CCT-Documents CCT/181 and CCT/189 | LS on request for feedback on the term “multiple-input and multiple-output (MIMO)” and its definition developed by ITU-R Working Party 5C and submitted to the CCT for validation | CCT | ITU-R WP 5A; ITU-R WP 5D; ITU-R WP 6A; ITU-R WP 4C; SG5; SG13; SG15; | 2025-10-02 |