MAC Layer Carrier Activation Signaling for Aperiodic CQI Reporting
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Solution Overview
Problem
In wireless communication systems, the existing methods for reporting Channel Quality Indication (CQI) information for activated Component Carriers (CCs) are slow, leading to delayed downlink data channel performance and scheduling limitations.
Innovation Solution
A method is introduced where a Base Station (BS) sends a MAC layer carrier activation signaling with CQI instruction information to User Equipment (UE), enabling the UE to rapidly report aperiodic CQI information for activated CCs, thereby improving the speed and accuracy of CQI reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If aperiodic CQI information reporting is triggered after activating CCs in the prior art, then CQI information can be reported, but the reporting speed is slow with a 12-subframe delay
Solution Approach 1:
The patent applies preliminary action by including CQI reporting trigger information in the MAC layer carrier activation signaling itself. This allows the UE to trigger aperiodic CQI information reporting immediately upon receiving the activation signaling, eliminating the 12-subframe delay required in prior art where CQI reporting could only be triggered after CC activation was complete.
2Reliability
If CQI information is reported periodically for activated CCs, then reporting is maintained, but the responsiveness to channel changes is reduced
Solution Approach 1:
The patent applies dynamics by enabling the network to flexibly switch between periodic and aperiodic CQI reporting modes. The MAC layer carrier activation signaling can dynamically trigger aperiodic reporting when rapid channel quality information is needed, while maintaining the option for periodic reporting for stable conditions, thus adapting to different channel scenarios.
Solution Approach 2:
The patent enhances feedback by implementing a mechanism where the BS can immediately request aperiodic CQI information through MAC layer signaling upon CC activation. This provides timely feedback about channel quality changes, allowing the BS to rapidly adjust scheduling decisions based on current channel conditions rather than relying on outdated periodic reports.
3Measurement precision
If the BS waits for CQI information before scheduling, then scheduling accuracy is maintained, but scheduling efficiency is reduced
Solution Approach 1:
The patent applies preliminary action by having the UE prepare and report aperiodic CQI information as soon as it receives the activation signaling with the CQI trigger. This allows the BS to obtain scheduling-relevant channel quality information immediately, eliminating the waiting period that would otherwise reduce scheduling efficiency while maintaining accuracy through the use of current channel measurements.
Data Source
AI summary
A information reporting method, base station and user equipment is provided in this invention. The method comprises sending the MAC layer carrier activation signaling to the UE, for activating a first CC of the UE, the MAC layer carrier activation signaling comprising CQI instruction information, for instructing the UE to report aperiodic CQI information of a second CC of the UE, so that the UE triggers to report aperiodic CQI information of the second CC of the UE upon receiving the MAC layer carrier activation signaling. With the information reporting method, base station and user equipment provided in an embodiment of this invention, the problem of slower report of CQI information of activated CCs can be addressed.