Priority-Based PSFCH Transmission Control for Sidelink UEs

The patent segments the PSFCH transmission into two groups: high-priority PSFCHs that must be transmitted and low-priority PSFCHs that can be dropped. This segmentation allows the UE to allocate power efficiently by ensuring critical feedback channels receive sufficient power while dropping less critical ones when power constraints are reached, thus maintaining reliability for essential communications without exceeding maximum power limits.

The patent applies different transmission quality requirements to different PSFCHs based on their priority levels. High-priority PSFCHs (e.g., for critical data) receive full power allocation to ensure reliable transmission, while low-priority PSFCHs (e.g., for non-critical data) accept reduced or zero power allocation. This local differentiation of quality requirements optimizes the power-reliability tradeoff.

By segmenting PSFCHs into priority-based groups, the system can reduce power for low-priority channels while maintaining full power for high-priority channels. This ensures that critical feedback transmissions maintain their reliability and coverage requirements, while non-critical transmissions accept reduced performance, thus controlling overall power consumption without compromising essential communication reliability.

The patent changes the transmission power parameter dynamically based on PSFCH priority and power availability. When total required power exceeds maximum capacity, the system adjusts power allocation by reducing or eliminating low-priority PSFCH transmissions while maintaining high-priority ones, thereby controlling power consumption while preserving reliability for critical communications.

The patent segments the set of PSFCHs into priority-based subsets, allowing the UE to transmit only the necessary number of PSFCHs given power constraints. By identifying which PSFCHs are high-priority versus low-priority, the system can transmit fewer PSFCHs when power is limited without losing critical feedback information, thus managing the quantity-transmitted versus power-consumption tradeoff.

The system applies partial action by transmitting only a subset of PSFCHs when power constraints prevent full transmission. Instead of attempting to transmit all scheduled PSFCHs, the UE transmits only the high-priority ones or the most critical feedback channels, accepting that some feedback may be incomplete but ensuring that essential communications are maintained.