Dynamic HARQ Retransmission Modes for Diverse Services

The patent implements dynamic HARQ mechanisms where the network device can flexibly select between synchronous HARQ, asynchronous HARQ, and adaptive modes based on service types and channel conditions. The terminal device and network device dynamically determine HARQ-related information including retransmission modes, number of HARQ processes, and RV version modes, enabling the system to adapt to diverse services while maintaining manageable complexity through standardized procedures.

The patent designs a unified HARQ framework that incorporates both synchronous and asynchronous modes within the same system. The network device determines whether to use synchronous HARQ with fixed timing or asynchronous HARQ with flexible timing based on service requirements. The same determination mechanism handles both modes, allowing the system to switch between fixed and flexible retransmission management without requiring separate systems.

The patent implements dynamic adjustment of the number of HARQ processes based on service types, channel conditions, and traffic patterns. The network device determines the appropriate number of HARQ processes through signaling to the terminal device, allowing the system to optimize throughput by increasing processes when needed while reducing resource overhead by decreasing processes when traffic demand is low. The system also dynamically configures related parameters such as window sizes and RV versions to match the active number of processes.

The patent implements a selective RV version strategy where the system uses multiple RV versions (including more than four versions in some embodiments) only when and where they provide necessary reliability improvements. The network device determines the appropriate RV version mode and signals it to the terminal device, allowing partial use of extended RV versions for critical transmissions while avoiding the full overhead of multiple versions for all transmissions. This selective approach balances reliability improvement with signaling overhead reduction.