Section: 16.14.9 Support for NR NTN coverage enhancements
Content: To improve NR uplink coverage in NTN, the following enhancements are supported: - PUCCH repetition for Msg4 HARQ-ACK configured in system information or dynamically in DCI for Msg4 when multiple repetition factors are configured in the system information: - UEs reports the capability of PUCCH repetition for Msg4 HARQ-ACK in Msg3 PUSCH; - When Msg4 HARQ-ACK is repeated, PUCCH repetition is applied for all PUCCH transmission before dedicated PUCCH resource is provided. - Improved channel estimation by NTN-specific PUSCH DMRS bundling enhancement that enables DMRS bundling in presence of timing drift, where the UE can maintain phase continuity by considering effects of transmission delay variation between the UE and the uplink time synchronization reference point.