Cross-Carrier HARQ Timing in TDD Carrier Aggregation

The patent applies local quality by defining cell-specific timing relationships for different cells in the carrier aggregation system. Each cell can have its own timing configuration (k values) tailored to its specific TDD uplink-downlink configuration, allowing the system to maintain proper timing synchronization locally in each cell while supporting broadband data services across multiple aggregated carriers with different configurations

The patent uses parameter changes by introducing configurable timing parameters (k values) that define the timing relationship between downlink control channels, downlink data channels, and uplink acknowledgment channels. These parameters can be adjusted based on the specific TDD configuration of each cell, enabling flexible cross-carrier scheduling while maintaining manageable timing relationship definitions through standardized parameter-based control

The patent applies segmentation by dividing the carrier aggregation system into independently configurable cells, each with its own TDD uplink-downlink configuration. This segmentation allows different carriers to serve different service requirements (providing flexibility) while the defined timing relationships and guard periods in each cell prevent uplink-downlink interference within that cell, isolating potential interference issues to individual cells rather than affecting the entire aggregated system