Broadcast Signal Frame Signaling Time Interleaving Mode

The transmission signal is segmented into multiple layers (first layer and second layer) with different power levels. The first layer carries essential services with higher power, while the second layer provides additional services with lower power. This segmentation enables flexible service support without requiring complex multiplexing techniques, as each layer can be independently decoded based on its power level.

The patent changes the power parameter of different signal layers to achieve multiplexing functionality. By assigning different power levels to different layers, the system can support multiple services with varying flexibility requirements. The power difference between layers serves as the key parameter that enables both TDM and FDM-like functionality while maintaining system flexibility.

Time interleaving is applied selectively only to the second layer signal, not to the entire multiplexed signal. This segmentation of the interleaving application reduces the overall decoding complexity while maintaining error correction capability for the enhanced services carried in the second layer. The first layer can be decoded independently without time interleaving, reducing unnecessary computational burden.

Instead of applying time interleaving to all layers, the patent applies it partially only to the second layer where enhanced error correction is needed. This partial action approach achieves the necessary reliability improvement for premium services while avoiding the excessive complexity that would result from applying time interleaving to all services uniformly.

The patent segments the PLP configuration into two distinct groups: PLPs that require time interleaving and PLPs that do not. This segmentation is achieved through separate configuration parameters (first time interleaving parameter for non-interleaved PLPs, second time interleaving parameter for interleaved PLPs). This enables the system to optimize decoding speed for standard services while maintaining service flexibility for enhanced services that require time interleaving.

The system dynamically configures time interleaving parameters based on the specific service requirements. Different PLPs can have different time interleaving settings, allowing the system to adapt to varying service needs. This dynamic configuration enables services to be flexibly assigned with or without time interleaving based on their specific requirements, optimizing both decoding speed and service flexibility.