Multi-Cell DCI Scheduling With HARQ-ACK Codebook Structuring
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Solution Overview
Problem
Current carrier aggregation techniques in 4G and 5G mobile communication systems are limited to single-cell scheduling of physical uplink and downlink shared channels, necessitating a shift to multi-cell scheduling to optimize spectrum utilization, while maintaining reduced control overhead.
Innovation Solution
Implementing multi-cell and multi-TTI scheduling with a single scheduling DCI, utilizing shared and separate indications for HARQ-ACK feedback fields, and determining bit sizes and orders for codebooks to construct sub-codebooks that reduce ambiguity and control overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If single-cell scheduling is used for physical uplink and downlink shared channels, then control overhead is reduced and system complexity is maintained, but spectrum utilization efficiency is limited
Solution Approach 1:
The patent segments the scheduling process by introducing separate indication fields for different cell groups within the DCI structure. The first indication field identifies a first cell group while the second indication field identifies a second cell group, allowing independent scheduling of multiple cells. This segmentation enables multi-cell scheduling capability while maintaining organized control structure, thereby improving spectrum utilization without excessive complexity increase.
2Productivity
If multi-cell scheduling is implemented, then spectrum utilization is optimized, but control overhead increases
Solution Approach 1:
The patent implements multi-functionality by designing the DCI structure to serve multiple purposes simultaneously. The first and second indication fields are designed to identify different cell groups, while the third indication field provides downlink assignment index for both cell groups. This universal DCI structure enables scheduling of multiple cells with shared resources, achieving spectrum optimization while controlling overhead through resource sharing.
3Loss of information
If separate HARQ-ACK feedback fields are used for different cell groups, then feedback ambiguity is reduced, but DCI structure complexity increases
Solution Approach 1:
The patent applies local quality by providing specialized indication fields for specific cell groups rather than a generic single field. The third indication field is specifically designed to provide downlink assignment index for the first cell group, while a fourth indication field provides the same function for the second cell group. This localized specialization reduces feedback ambiguity for each cell group while maintaining overall DCI structure organization.
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AI summary
Methods and systems for techniques for determining control information in wireless networks are disclosed. In an implementation, a method of wireless communication includes receiving, by a wireless device, a first configuration of multiple traffic channels on multiple cells scheduled by a downlink control information (DCI) and a second configuration of multiple traffic channels on one cell scheduled by the DCI, and receiving the multiple traffic channels scheduled by the DCI.