Aperiodic CSI-RS Rate Matching via Common Control Channel
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently performing data channel rate matching for aperiodic CSI-RS in LTE systems, particularly in dynamically indicating rate matching information for aperiodic CSI-RS, which affects data transmission efficiency.
Innovation Solution
A method and device for a user equipment (UE) to receive resource configuration information for aperiodic CSI-RS through higher layers, including rate matching information within the common control channel, allowing the UE to receive the UE-specific control channel with a triggering message for CSI reporting using the provided rate matching information, even when the UE-specific control channel is not mapped to specific resources for the aperiodic CSI-RS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rate matching information for aperiodic CSI-RS is not dynamically indicated, then system complexity is reduced, but data transmission efficiency deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple rate matching patterns through higher layer signaling before data transmission. The UE receives and stores multiple rate matching pattern configurations in advance, then dynamically selects the appropriate pattern based on received indicators during transmission, avoiding the need for real-time rate matching calculations while maintaining efficiency.
Solution Approach 2:
The patent implements dynamics by introducing dynamic rate matching pattern indication through DCI formats. The base station can dynamically select and indicate different rate matching patterns for aperiodic CSI-RS based on current channel conditions and traffic requirements, allowing the system to adapt flexibly without increasing overall complexity.
2Productivity
If rate matching information is dynamically indicated for aperiodic CSI-RS, then data transmission efficiency is improved, but control channel overhead increases
Solution Approach 1:
The patent merges rate matching pattern indication with existing DCI formats used for scheduling assignments. By combining multiple functions (scheduling information and rate matching indication) into a single control message, the patent avoids additional overhead while achieving dynamic rate matching. The rate matching pattern indicator is integrated into the existing DCI structure rather than being transmitted separately.
3Measurement precision
If multiple rate matching patterns are configured for different aperiodic CSI-RS, then rate matching accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the rate matching process into distinct patterns, each optimized for specific aperiodic CSI-RS configurations. Multiple rate matching patterns are defined with different parameters (such as different resource element mappings), and the UE selectively applies the appropriate pattern based on the indicated configuration, managing complexity through structured segmentation rather than monolithic processing.
Data Source
AI summary
Disclosed in the present application is a method by which a terminal receives a terminal-specific control channel from a base station in a wireless communication system. Particularly, the method comprises the steps of: receiving, through an upper layer, resource configuration information for at least one aperiodic channel status information-reference signal (CSI-RS); receiving a common control channel including rate matching information of the terminal-specific control channel; and receiving, from the base station, together with the at least one aperiodic CSI-RS, the terminal-specific control channel including a triggering message of a CSI report based on the at least one aperiodic CSI-RS, by using the rate matching information.