Adaptive Cyclic Prefix Duration for MBSFN Inter-Symbol Interference

The patent applies local quality by configuring different cyclic prefix durations for different eNBs based on their specific propagation characteristics. Each eNB determines its own CP duration according to its maximum propagation path length to UEs, rather than using a uniform CP duration across the entire network. This allows distant high-power eNBs to use longer CP durations to accommodate their larger delay spreads, while closer eNBs can use shorter CP durations, optimizing both reliability and efficiency for each local situation.

The patent implements dynamics by making the cyclic prefix duration adaptive rather than fixed. The CP duration is dynamically determined based on the maximum propagation path length specific to each eNB's coverage area. This allows the system to use the minimum necessary CP duration for each eNB, avoiding the bandwidth efficiency loss that would result from using a uniformly long CP duration across all eNBs. The adaptive approach ensures coherent signal combination only where propagation delays require it.

The patent applies parameter changes by modifying the cyclic prefix duration parameter based on propagation characteristics. Instead of using a fixed uniform CP duration, the system allows each eNB to adjust its CP duration parameter according to its maximum propagation path length. This parameter adaptation enables distant high-power eNBs to use longer CP durations to accommodate their larger delay spreads, while maintaining simpler configuration for eNBs that don't require extended CP durations.