BWP Switching Delay Calculation Using MRTD and SCS
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Solution Overview
Problem
Current bandwidth part (BWP) switching delay requirements are inaccurate for high subcarrier spacing (SCS) scenarios, particularly in cross-carrier scheduling, due to the short slot/symbol/cyclic prefix lengths and varying receive timing differences between carriers, leading to increased switching delays.
Innovation Solution
The proposed solution involves calculating BWP switching delay based on the maximum receive timing difference (MRTD) and subcarrier spacing differences between cells, using specific formulas to account for inter-band and intra-band scenarios, ensuring accurate delay requirements for cross-carrier BWP switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If BWP switching delay is calculated using fixed slot-based requirements, then the switching delay is simplified to determine, but the calculation becomes inaccurate for high SCS scenarios with varying receive timing differences
Solution Approach 1:
The patent changes the calculation parameters from fixed slot-based requirements to dynamic parameters including MRTD (maximum receive timing difference), SCS (subcarrier spacing), and CP (cyclic prefix) length. This allows the BWP switching delay to be accurately calculated based on actual high SCS scenario characteristics rather than applying generic slot-based formulas, thereby improving measurement precision while accounting for varying timing differences between carriers
Solution Approach 2:
The patent segments the BWP switching delay calculation into distinct components: MRTD determination, SCS adjustment factors, and CP length considerations. By breaking down the overall delay calculation into these separable elements, the patent improves accuracy for each component while maintaining manageable calculation complexity through structured computation
2Adaptability or versatility
If cross-carrier scheduling is implemented with high SCS, then network flexibility and performance are enhanced, but receive timing differences between carriers increase switching delay
Solution Approach 1:
The patent applies preliminary action by calculating and compensating for MRTD between scheduling and scheduled carriers before executing the BWP switch. By determining the maximum receive timing difference in advance and incorporating it into the switching delay calculation, the system prepares for the timing mismatch inherent in cross-carrier scheduling, thereby reducing the actual switching delay experienced during operation
Solution Approach 2:
The patent adjusts the BWP switching delay parameter based on SCS and CP length specific to each carrier involved in cross-carrier scheduling. By dynamically modifying the delay parameter to match the actual timing characteristics of the high SCS scenario rather than using fixed values, the patent reduces unnecessary time loss while maintaining the flexibility benefits of cross-carrier scheduling
Data Source
AI summary
Various embodiments herein are directed to determining a bandwidth part (BWP) switching delay based on a maximum receive timing difference (MRTD) between two cells. A user equipment (UE) is configured to: determine timing information that includes a maximum receive timing difference (MRTD) between a first cell from which the UE receives downlink control information (DCI) and a second cell where a bandwidth part (BWP) switch is to occur; determine a BWP switching delay based on the MRTD; and perform the BWP switch based on the determined BWP switching delay.