Dynamic TTI Allocation for 5G Service Latency Adaptation

The patent implements dynamic TTI length adjustment by introducing multiple TTI length configurations (first TTI length for latency-sensitive services, second TTI length for other services). The base station dynamically selects and notifies the appropriate TTI length to user equipment based on service requirements, enabling the system to adapt TTI duration in real-time rather than using a fixed length, thus resolving the contradiction between adaptability and complexity.

The patent changes the TTI length parameter according to different service types. By defining different TTI length values (first TTI length vs. second TTI length) and selecting appropriate values based on service latency requirements, the system achieves parameter-based adaptation. This allows the same physical layer structure to support multiple TTI lengths, improving versatility without fundamentally redesigning the system.

The base station performs preliminary action by pre-configuring and notifying user equipment of the TTI length to be used before actual data transmission. Through downlink control information (DCI), the base station informs the UE of the upcoming TTI length, allowing the UE to prepare its reception and processing parameters in advance. This preliminary notification mechanism ensures reliable service latency satisfaction while managing control signaling complexity through efficient pre-planning.

The downlink control information structure is designed to be universal, capable of indicating both first TTI length and second TTI length configurations. A single control signaling mechanism handles multiple TTI length scenarios, rather than requiring separate signaling paths for different service types. This multi-functional control structure reduces overall signaling complexity while ensuring reliable latency requirement satisfaction.