Dual CQI Index Feedback for Instantaneous Transmission Rate Accuracy
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Solution Overview
Problem
The existing communication systems face challenges in accurately reflecting instantaneous transmission rates due to limited CQI indexes, leading to inefficient channel resource utilization as the UE struggles to find a suitable CQI index matching the channel's quality, resulting in suboptimal data transmission rates.
Innovation Solution
The method involves the UE sending two CQI indexes to the base station: one for the average transmission rate and another for the difference between the instantaneous and average transmission rates, allowing for more accurate feedback of the instantaneous transmission rate, thereby improving channel resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the UE feeds back only one CQI index corresponding to instantaneous transmission rate, then the feedback process is simple, but the accuracy of transmission rate reflection is insufficient due to channel fluctuations
Solution Approach 1:
The patent segments the CQI feedback into two distinct indexes: first CQI index representing average transmission rate and second CQI index representing instantaneous transmission rate. This segmentation allows the system to separately capture both the general channel quality and rapid fluctuations, resolving the contradiction by maintaining feedback simplicity through standardized indexing while significantly improving transmission rate reflection accuracy through dual-index representation.
Solution Approach 2:
The patent introduces a temporal dimension to CQI feedback by adding the second CQI index that specifically captures instantaneous variations. This dimensional expansion transforms the feedback from a single static value to a two-dimensional representation (average + instantaneous), enabling more precise transmission rate reflection without substantially increasing feedback complexity.
2Loss of energy
If the UE uses limited CQI indexes to feedback channel quality, then the feedback overhead is reduced, but the ability to accurately match channel quality is compromised
Solution Approach 1:
The patent divides the channel quality feedback into two segmented CQI indexes, each serving a specific function: the first index for average quality and the second for instantaneous variations. This segmentation enables the system to maintain low feedback overhead through compact indexing while dramatically improving adaptability by capturing both steady-state and dynamic channel characteristics that a single index cannot represent.
Solution Approach 2:
The patent changes the parameter representation from a single CQI index to two CQI indexes with different functional meanings. This parameter transformation allows the system to preserve feedback efficiency (low overhead) while enhancing channel quality matching capability by independently adjusting average and instantaneous rate representations based on actual channel conditions.
3Ease of operation
If the UE periodically feeds back CQI index with fixed period, then the feedback timing is simple, but the responsiveness to rapid channel changes is insufficient
Solution Approach 1:
The patent introduces dynamics into the feedback system by adding the second CQI index that specifically tracks instantaneous transmission rate changes. While the feedback period remains fixed for simplicity, the dual-index mechanism enables rapid response to channel fluctuations because the second index captures moment-to-moment variations, allowing the base station to quickly adapt transmission parameters without changing the feedback timing structure.
Solution Approach 2:
The patent adds a temporal resolution dimension through the second CQI index, which captures instantaneous channel quality within each feedback period. This dimensional enhancement maintains the simplicity of periodic feedback timing while significantly improving responsiveness to rapid channel changes by providing granular temporal information about channel fluctuations.
Data Source
AI summary
Embodiments of the present invention provide a method for determining a transmission rate supported by a data stream, user equipment, and a base station. The method includes: determining, by user equipment UE, a first index corresponding to an average transmission rate supported by a channel between the UE and the base station; determining, by the UE, a second index corresponding to a difference between an instantaneous transmission rate supported by a data stream on the channel and an average transmission rate supported by the data stream on the channel; sending, by the UE, the first index to the base station; and sending, by the UE, the second index to the base station. According to the embodiments of the present invention, the instantaneous transmission rate supported by the data stream on the channel can be relatively accurately fed back to the base station, thereby improving channel resource utilization.