Multi-Cell CSI Feedback for Cross-Carrier Scheduling Overhead
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing channel state information (CSI) feedback for multi-cell downlink control information (MC-DCI), particularly in scenarios involving multiple component carriers (CCs), which can lead to suboptimal resource allocation and interference management.
Innovation Solution
Implementing a method and apparatus for transmitting and receiving MC-DCI and CSI feedback based on radio resource control (RRC) configuration, enabling efficient scheduling of channels across multiple CCs and improving CSI feedback mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional per-cell CSI feedback mechanisms are used for multi-cell scheduling, then each cell can be managed independently, but the feedback overhead and processing complexity increase significantly
Solution Approach 1:
The patent combines CSI feedback from multiple cells into a unified feedback structure. Instead of treating each cell's CSI feedback separately, the system merges the feedback for multiple cells scheduled by MC-DCI into a single coordinated feedback mechanism, reducing overall processing complexity while maintaining feedback accuracy.
Solution Approach 2:
The patent creates a universal CSI feedback mechanism that handles multiple cells through a single feedback process. The feedback system is designed to be multi-functional, serving multiple cells simultaneously rather than requiring separate dedicated feedback paths for each cell.
2Productivity
If separate scheduling is used for each component carrier, then resource allocation is simple per carrier, but overall spectral efficiency and resource utilization decrease
Solution Approach 1:
The patent merges multiple component carrier scheduling operations into a single MC-DCI message. By combining scheduling decisions for multiple carriers into one control message, the system achieves coordinated multi-carrier scheduling that improves spectral efficiency while managing complexity through unification.
Solution Approach 2:
The patent introduces a new dimension to scheduling by enabling cross-carrier scheduling capabilities. The MC-DCI mechanism allows scheduling decisions to span multiple carriers simultaneously, adding a dimensional aspect to resource allocation that goes beyond traditional per-carrier independent scheduling.
3Reliability
If multiple MC-DCI messages are transmitted for different cell sets, then each cell set can be optimized independently, but control signal overhead increases
Solution Approach 1:
The patent merges multiple DCI messages into a single MC-DCI structure that can schedule multiple cells. This consolidation reduces control signal overhead by eliminating redundant messaging while preserving the ability to provide optimized scheduling for different cell sets through the unified MC-DCI framework.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a network node, a multi-cell downlink control information (MC-DCI) that indicates scheduling information for scheduling channels on multiple component carriers (CCs). The UE may transmit, to the network node, channel state information (CSI) feedback for a set of cells scheduled by the MC-DCI based at least in part on a radio resource control (RRC) configuration. Numerous other aspects are described.