Multi-Carrier Channel Feedback via Carrier Indicator Field
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Solution Overview
Problem
The LTE-A system lacks a design solution for non-periodical feedback of channel information from multiple carriers, which is essential for effective carrier scheduling and link adaptation in carrier aggregation scenarios, as the existing LTE Rel-8/9 protocol only supports feedback for a single carrier.
Innovation Solution
A method and device for a UE to measure and transmit channel information, including CQI, PMI, and RI, over multiple downlink carriers in response to a base station's instruction, using pre-configured feedback modes and pairing relationships between uplink and downlink carriers, allowing for non-periodical feedback of channel information across multiple carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the LTE Rel-8/9 protocol is used for carrier aggregation, then backward compatibility is maintained, but non-periodical feedback of channel information from multiple carriers is not supported
Solution Approach 1:
The patent segments the feedback mechanism by introducing a carrier indicator field that identifies specific carriers for feedback, allowing the UE to report channel information from multiple carriers in a segmented, organized manner rather than treating them as a single unified feedback process
Solution Approach 2:
The patent makes the feedback mechanism universal by enabling the same PUSCH feedback structure to handle both single-carrier and multi-carrier scenarios, allowing the base station to configure feedback for multiple carriers using the existing feedback framework without requiring separate dedicated mechanisms
2Productivity
If channel information from multiple carriers is feedback via PUSCH, then effective carrier scheduling is enabled, but feedback overhead increases
Solution Approach 1:
The patent applies partial action by allowing the base station to selectively configure feedback for specific carriers or carrier sets rather than requiring feedback from all carriers, enabling the UE to report only the necessary channel information for carriers that need scheduling adjustments
Solution Approach 2:
The patent implements preliminary action through upper-layer signaling that pre-configures the carrier indicator field and feedback parameters before actual feedback transmission, allowing the base station to prepare the feedback structure in advance and reduce the overhead during actual feedback transmission
3Reliability
If non-periodical feedback is implemented for multiple carriers, then link adaptation is improved, but system complexity increases
Solution Approach 1:
The patent implements feedback by enabling the UE to transmit channel information from multiple carriers on the PUSCH in response to base station instructions, creating a closed-loop feedback mechanism that allows the base station to adjust scheduling decisions based on actual channel conditions across multiple carriers
Solution Approach 2:
The patent applies dynamics by making the feedback configuration flexible and adaptable, allowing the base station to dynamically configure which carriers require feedback and when, rather than using fixed periodic feedback patterns, enabling the system to adapt to changing channel conditions and scheduling needs
Data Source
AI summary
There is a method and device for scheduling channel information feedback to perform a feedback of channel information of a plurality carriers, wherein the method for feeding back channel information includes: a user equipment measuring channel information over a plurality of downlink carriers; upon reception of an instruction to trigger a feedback of channel information transmitted from a base station, the user equipment transmitting to the base station the measured channel information of corresponding downlink carriers in an obtained set of downlink carriers required to be measured and fed back.