Uplink Grant Triggered CQI Report Selection
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Solution Overview
Problem
Current CQI reporting mechanisms in LTE lack flexibility in the use of available resources, making it difficult to fully support all possible CQI feedback schemes and requiring excessive physical resources for uplink physical control signaling.
Innovation Solution
A method where a UE determines whether to transmit a detailed or less detailed CQI report based on the availability of an uplink grant, with detailed reports sent on granted resources and less detailed reports sent on dedicated resources or not sent at all if no grant is received.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detailed CQI reports are transmitted on dedicated uplink control channel resources, then channel state feedback precision is improved, but uplink control channel overhead increases
Solution Approach 1:
The patent implements dynamic CQI reporting by allowing the UE to adaptively select between different CQI report types (full, partial, differential) based on channel conditions and grant availability. This dynamic adaptation enables the system to transmit detailed feedback when needed while reducing overhead during normal operations, resolving the contradiction between precision and overhead.
Solution Approach 2:
The patent changes the parameter of CQI report detail level based on uplink grant availability. When an uplink grant is received, the UE transmits more detailed CQI information; when no grant is received, it transmits less detailed or no CQI information. This parameter change allows the system to adjust feedback precision according to resource availability, resolving the contradiction between precision and overhead.
2Adaptability or versatility
If multiple CQI feedback schemes are supported, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent segments CQI feedback into multiple types (full CQI, partial CQI, differential CQI) that can be independently selected and transmitted. Each segment serves a specific purpose and can be handled by simplified processing logic, reducing overall device complexity while maintaining adaptability to different feedback requirements.
Solution Approach 2:
The patent implements partial CQI reporting where the UE can transmit only the necessary portion of CQI information based on current needs. Instead of always transmitting complete feedback, the system uses partial reporting when full feedback is not required, reducing processing complexity while maintaining the ability to provide detailed feedback when needed, thus resolving the contradiction between adaptability and complexity.
Data Source
AI summary
Channel state feedback is provided from a UE to a base station as a first, detailed or a second, less detailed type of channel state feedback information. Initially it is determined whether the UE has received an uplink grant from the base station or not. If the UE has received an uplink grant, a first type of channel state feedback information is transmitted to the base station on the granted resource. If, however, the UE has not received an uplink grant, a second type of channel state feedback information is transmitted to the base station. Different types of channel state feedback information enables a UE and an associated base station to use available resources more efficiently, when requesting for and delivering channel state feedback information.