Multi-TTI PDSCH Configuration via DCI Scheduling Offset Segmentation
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Solution Overview
Problem
In wireless communication technologies, the existing methods for configuring downlink control channels face challenges with high overhead in DCI monitoring due to large sub-carrier spaces, particularly when scheduling multiple physical downlink shared channels (PDSCHs) across multiple transmission time intervals (TTIs), which complicates scheduling and compatibility.
Innovation Solution
The method configures a multi-TTI PDSCH scheduled by DCI to include two categories of PDSCHs with specific scheduling offsets relative to the physical downlink control channel (PDCCH), where one category has an offset less than a preset threshold and the other greater than or equal to the threshold, and configures quasi-co-location (QCL) information for each PDSCH to improve compatibility and reduce complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If one separate DCI is used to schedule each PDSCH in multi-TTI scenarios, then scheduling flexibility is improved, but DCI monitoring overhead increases significantly
Solution Approach 1:
The patent combines multiple PDSCH scheduling functions into a single DCI message. Specifically, one DCI schedules multiple PDSCHs across multiple TTIs by indicating a list of slot offsets and corresponding transport block sizes, thereby reducing the number of DCIs and monitoring overhead while maintaining scheduling flexibility
Solution Approach 2:
The DCI structure is designed to perform multiple scheduling functions simultaneously. A single DCI can schedule PDSCHs in different slots with different transport block sizes by including a list of slot offsets and TB size indicators, making the DCI universal for multi-TTI scheduling scenarios
2Device complexity
If multiple PDSCHs are scheduled by one DCI in multi-TTI scenarios, then DCI monitoring complexity is reduced, but scheduling precision and compatibility deteriorate
Solution Approach 1:
The patent segments the scheduling information into distinct fields within the DCI: a list of slot offsets for each scheduled PDSCH, and corresponding transport block size indicators. This segmentation allows precise control over multiple PDSCHs while keeping the DCI structure organized and manageable
Solution Approach 2:
The DCI includes dynamic parameters such as slot offsets and transport block size indicators that can be adjusted for each scheduled PDSCH. These parameter changes enable precise scheduling control for multiple PDSCHs across different TTIs, maintaining scheduling precision even when multiple channels are scheduled by one DCI
Data Source
AI summary
A method for configuring a downlink control channel is performed by a network device, and includes: configuring a multiple-transmission-time-interval (multi-TTI) physical downlink shared channel (PDSCH), scheduled by downlink control information (DCI), to include at least one of: a first category of PDSCH or a second category of PDSCH; wherein a scheduling offset between each of the first category of PDSCH and a physical downlink control channel (PDCCH) of the DCI is less than a preset threshold and a scheduling offset between each of the second category of PDSCH and the PDCCH of the DCI is greater than or equal to the preset threshold.