HARQ Buffer Flushing via Time Alignment Timer in Multi-TRP Wireless Systems

The patent applies preliminary action by introducing a time alignment timer that is started in advance before buffer overflow occurs. The timer is configured with a specific duration and is started when new data is received, allowing the system to proactively manage buffer resources by flushing HARQ identifiers before the buffer becomes full, thus preventing overflow while maintaining reliable multi-TRP communications.

The patent implements feedback mechanisms where the UE monitors the time alignment timer status and automatically triggers buffer flushing actions based on timer expiration or buffer full conditions. This feedback loop allows the system to dynamically adjust buffer management behavior, flushing HARQ identifiers when the timer expires or when the buffer is full, thereby maintaining reliability while controlling complexity through automated management.

The time alignment timer is started in advance when new data is received, creating a proactive management mechanism. The timer's predetermined duration allows the system to plan for buffer flushing before overflow occurs, efficiently managing buffer resources by maintaining HARQ identifiers only for the duration they are needed, thus preventing resource waste while ensuring reliability.

The patent implements discarding and recovering by flushing HARQ identifiers from the buffer when the time alignment timer expires or when the buffer is full. This mechanism allows the system to discard old or unnecessary identifiers to make room for new data, while the buffer capacity is recovered and reused for subsequent communications, efficiently managing buffer resource usage while maintaining communication reliability.

The time alignment timer is configured to serve multiple functions: it tracks timing alignment for multi-TRP communications, triggers buffer flushing actions, and manages resource allocation. By making the timer multi-functional, the patent reduces overall system complexity despite the additional timer mechanism, as a single component handles multiple buffer management tasks simultaneously.

The system implements self-service by having the UE automatically start the time alignment timer when new data is received and automatically flush buffer resources when the timer expires or the buffer is full. This autonomous behavior eliminates the need for external intervention or complex control logic, reducing processing overhead while ensuring reliable buffer management through self-regulating mechanisms.