Dynamic Cyclic Prefix Length Configuration for Base Station Throughput

The patent applies dynamics by making the cyclic prefix length variable rather than fixed. The base station dynamically adjusts the CP length based on channel conditions and transmission requirements, allowing the system to adapt to different scenarios. This is achieved through signaling the terminal with CP length information, enabling the terminal to configure its receiver accordingly. This dynamic adjustment reduces overhead in scenarios with shorter delay spreads while maintaining robustness in scenarios requiring longer CP, thereby improving overall system throughput.

The patent changes the parameter of cyclic prefix length from a fixed value to a variable parameter that can be adjusted based on channel conditions. By signaling the terminal with information about the actual CP length used in each subframe or set of subframes, the system can optimize the trade-off between overhead and performance. This parameter change allows the data portion of the subframe to be extended when shorter CP is sufficient, directly increasing the available transmission capacity.

The patent applies local quality by allowing different cyclic prefix lengths to be used in different subframes or for different terminal groups based on local channel conditions. Instead of uniformly applying a long CP designed for the worst-case scenario across all transmissions, the system tailors the CP length to match the actual delay spread experienced in each specific transmission instance. This is achieved through the base station measuring or estimating the channel conditions and signaling the appropriate CP length to the terminal.

The system dynamically adjusts the cyclic prefix length based on real-time channel conditions rather than using a static, worst-case-oriented CP length. The base station can change the CP length configuration adaptively, signaling updates to terminals as channel conditions evolve. This dynamic approach ensures that the CP is long enough to cover the actual delay spread in each scenario while avoiding the excessive overhead that would result from always using the maximum CP length.

The patent resolves this contradiction by making the cyclic prefix length dynamic rather than static. The base station adjusts the CP length based on measured channel conditions, signaling the appropriate length to terminals. When channel conditions are good with short delay spread, shorter CP is used to maximize throughput. When conditions deteriorate or delay spread increases, the CP length is extended to maintain reliability. This dynamic adaptation allows the system to optimize the trade-off between throughput and reliability in real-time.

The system employs feedback mechanisms where the base station measures channel conditions (such as delay spread) and uses this information to determine the appropriate cyclic prefix length. The base station then signals this configuration to the terminal, which configures its receiver accordingly. This feedback loop ensures that the CP length is always appropriate for current channel conditions, preventing inter-symbol interference when necessary while maximizing data transmission efficiency when conditions permit shorter CP.