DCI Scheduling Multiple Cells with Different Subcarrier Spacings
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Solution Overview
Problem
In 5G New Radio (NR) systems, existing multicarrier communication methods face challenges in scheduling multiple carriers simultaneously due to interference issues, leading to reduced resource utilization and increased latency, particularly in Subband non-overlapping Full Duplex (SBFD) modes, where self-interference and Cross-Link Interference (CLI) are severe.
Innovation Solution
A method is introduced where a single Downlink Control Information (DCI) schedules multiple cells with different subcarrier spacings, using a unified design that dynamically adjusts the scheduling offset based on physical layer signaling, allowing for flexible scheduling across slots and reducing the need for additional signaling, thereby enhancing resource utilization and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single DCI schedules multiple carriers simultaneously in SBFD mode, then resource utilization improves and latency reduces, but self-interference and Cross-Link Interference (CLI) increase severely
Solution Approach 1:
The patent segments the scheduling process by introducing separate indication fields for different carriers within the DCI structure. Each carrier's scheduling parameters including interference management settings are independently indicated, allowing the system to schedule multiple carriers simultaneously while managing interference on each carrier separately through dedicated control information.
Solution Approach 2:
The patent changes scheduling parameters dynamically by introducing a minimum scheduling offset parameter that can be independently configured for each carrier. This allows the system to adjust timing relationships between DCI and scheduled data channels on different carriers, optimizing resource utilization while maintaining interference levels within acceptable thresholds through parameter adaptation.
2Reliability
If separate PDCCHs are used for each carrier, then interference management is simplified, but resource utilization decreases and latency increases
Solution Approach 1:
The patent merges the scheduling function by enabling a single DCI to schedule multiple carriers simultaneously. The DCI structure includes indication fields for multiple carriers, allowing consolidated scheduling control while maintaining the ability to manage interference on each carrier through dedicated parameter indications within the unified DCI message.
Solution Approach 2:
The patent makes the DCI structure universal by designing it to handle multiple carriers with different subcarrier spacings through a unified format. The DCI includes flexible indication fields that can accommodate scheduling parameters for different carrier types, enabling one DCI to perform the multi-functionality of scheduling multiple carriers with diverse configurations.
3Adaptability or versatility
If a DCI schedules cells with different subcarrier spacings, then scheduling flexibility improves, but determining the effective time for minimum applicable scheduling offset becomes complex
Solution Approach 1:
The patent applies local quality by introducing cell-specific minimum scheduling offset parameters within the DCI structure. Each scheduled cell can have its own minimum scheduling offset value indicated in the DCI, allowing the system to accommodate different subcarrier spacings and timing requirements for each cell individually while maintaining unified scheduling control through the single DCI message.
Data Source
AI summary
The first node receives a first DCI scheduling K1 cells; at least 2 cells among the K1 cells respectively correspond to subcarrier spacings that are unequal, K1 being a positive integer greater than 1; the first minimum applicable scheduling offset is indicated via a physical layer dynamic signaling in a first slot; a first cell is one of the K1 cells, and the first cell is different from a cell to which the physical layer dynamic signaling belongs, the first minimum applicable scheduling offset applying to the first cell from a second slot of the first cell; the second slot depends on the first slot and a first offset value, the first offset value being related to both a subcarrier spacing corresponding to the first cell and a subcarrier spacing corresponding to the cell to which the physical layer dynamic signaling belongs. This application is for the effective time.