Timing Threshold for Cross-Carrier Scheduling
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Solution Overview
Problem
Wireless communication systems face challenges in configuring a timing threshold for cross-carrier scheduling with different subcarrier spacings, which affects the synchronization and processing of downlink transmissions between carriers with varying subcarrier spacings.
Innovation Solution
A method and apparatus for wireless communication that involves receiving a scheduling indication via a physical downlink control channel (PDCCH) on a first carrier with a specific subcarrier spacing, and processing the downlink transmission on a second carrier based on a timing threshold that includes a basic term and an adjustment term. The basic term is based on the minimum delay between the PDCCH and the scheduled downlink transmission, while the adjustment term accounts for the processing time due to differences in subcarrier spacings between the two carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cross-carrier scheduling is implemented with different subcarrier spacings, then carrier aggregation capability is improved, but timing synchronization and processing between carriers deteriorates
Solution Approach 1:
The patent applies parameter changes by introducing a timing threshold parameter that is specifically adjusted based on the subcarrier spacing configuration. When different subcarrier spacings are used across carriers, the timing threshold is modified to account for the processing time differences, thereby maintaining reliable timing synchronization while enabling carrier aggregation with diverse numerical configurations
Solution Approach 2:
The timing threshold acts as an intermediary parameter between the PDCCH scheduling indication and the downlink transmission processing. It mediates the timing relationship by incorporating an adjustment term that compensates for subcarrier spacing differences, allowing the system to handle cross-carrier scheduling with different numerical configurations while maintaining synchronization reliability
2Measurement precision
If timing threshold adjustment for different subcarrier spacings is implemented, then processing accuracy is improved, but system complexity increases
Solution Approach 1:
The patent modifies the timing threshold parameter by adding an adjustment term that is calculated based on the subcarrier spacing difference between carriers. This parameter change approach improves processing accuracy by accounting for timing differences while maintaining a relatively simple computational structure that only requires comparing subcarrier spacing values and applying a corresponding adjustment
Solution Approach 2:
The system performs preliminary determination of the timing threshold adjustment based on pre-configured subcarrier spacing relationships. By pre-establishing the adjustment terms for different subcarrier spacing combinations, the system avoids complex real-time calculations and reduces processing complexity while maintaining high processing accuracy
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, on a first carrier having a first subcarrier spacing (SCS), a scheduling indication via a physical downlink control channel (PDCCH) scheduling a downlink transmission on a second carrier having a second SCS. The UE may process the downlink transmission on the second carrier based at least in part on a delay between the PDCCH and the scheduled downlink transmission and a timing threshold having a basic term and an adjustment term. For example, the basic term may be based at least in part on a minimum delay between the PDCCH and the scheduled downlink transmission, and the adjustment term may be based at least in part on a processing time due to a difference between the first SCS and the second SCS. Numerous other aspects are provided.