Wireless Multi-Cell DCI Scheduling to Reduce Control Overhead
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in signal transmission and reception procedures, particularly in multi-cell scheduling scenarios, leading to increased control overhead and reduced flexibility in spectrum and power usage.
Innovation Solution
A method and apparatus for wireless communication systems that utilize multi-cell scheduling through a single DCI, where a specific FDRA field for a first cell is set to an invalid value, allowing the determination of a HARQ-ACK codebook index via a MCS field, enabling the UE to skip receiving PDSCH for certain cells and optimize resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multi-cell scheduling is implemented using traditional DCI formats, then spectrum utilization is improved, but DCI overhead increases and flexibility is reduced
Solution Approach 1:
The patent applies multi-functionality by enabling a single DCI to serve multiple cells simultaneously. The DCI includes a cell list indicating multiple cells and a single FDRA field that can be interpreted differently for each cell in the list, allowing one DCI to schedule resources across multiple cells rather than requiring separate DCIs for each cell.
Solution Approach 2:
The patent implements local quality by allowing different interpretations of the FDRA field for different cells within the same DCI. Each cell in the indicated cell list can have its own valid FDRA value, and the UE determines which interpretation applies to each cell based on the cell-specific configuration and the provided cell list.
2Manufacturing precision
If separate DCIs are used for each cell in multi-cell scheduling, then resource allocation precision is maintained, but control overhead increases
Solution Approach 1:
The patent merges multiple DCIs into a single DCI that schedules resources for multiple cells simultaneously. The unified DCI structure includes a cell list field that identifies multiple cells and a shared FDRA field that provides resource allocation information applicable to each cell in the list, thereby reducing the total number of control signals while maintaining precise resource allocation.
3Reliability
If UE receives PDSCH for all scheduled cells, then reception completeness is improved, but time consumption increases
Solution Approach 1:
The patent applies partial action by enabling the UE to selectively receive PDSCH only for cells where the FDRA field contains a valid FDRA value. When a cell in the indicated cell list has an invalid FDRA value, the UE skips receiving PDSCH for that cell, thereby reducing reception time while maintaining completeness for cells that do have valid allocations.
Data Source
AI summary
According to at least one of various embodiments, UE may receive, via a PDCCH, DCI including at least one FDRA field and at least one MCS field and transmit an HARQ-ACK codebook on the basis of the DCI. The DCI may support multi-cell scheduling on the basis of a plurality of cells configured in the UE, and on the basis that a first FDRA field for a first cell, included in the DCI is set, for the first cell, to a specific value other than a valid FDRA value, an index of the HARQ-ACK codebook may be determined via a first MCS field for the first cell, included in the DCI.