PUSCH Beam Selection for Reliable Multi-TRP Transmission

The patent segments the beam management for multi-TRP PUSCH transmission by introducing separate spatial relation reference signals (spatial relation RS) for each TRP. Instead of using a single default beam for all TRPs, the system divides the beam management into TRP-specific components, where each TRP has its own spatial relation RS that the UE can independently determine and apply. This segmentation resolves the contradiction by maintaining reliability through TRP-specific beam accuracy while managing complexity through structured separation of beam management tasks.

The patent applies preliminary action by having the base station pre-configure multiple spatial relation RS resources corresponding to different TRPs before PUSCH transmission. The UE is provided with this spatial relation information in advance through RRC signaling or MAC CE, allowing it to quickly select and apply the appropriate spatial relation RS for each TRP without performing complex real-time beam management. This preliminary configuration reduces the operational complexity during transmission while maintaining high reliability through accurate TRP-specific beam direction.

The patent applies universality by designing the spatial relation RS configuration mechanism to serve multiple functions simultaneously. The same spatial relation RS resources configured for multi-TRP PUSCH transmission can also be used for other uplink transmissions, and the configuration framework supports both single-TRP and multi-TRP scenarios. This multi-functionality reduces the need for separate dedicated configurations, thereby minimizing information overhead while maintaining high transmission precision through accurate TRP-specific beam direction.