Disjoint Segmentation for Channel Quality Feedback Overhead Reduction
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in channel quality information feedback, particularly in massive MTC and URLLC scenarios, where conventional methods result in high overhead and are not optimized for finding the worst or best channel conditions among multiple UEs, especially in multicast/broadcast services.
Innovation Solution
The proposed method employs disjoint segmentation of channel quality index levels based on a threshold, allowing UEs to encode and transmit channel quality information using fewer bits by dividing indices into non-overlapping subsets of varying lengths, reducing feedback overhead and enabling the base station to efficiently identify the best or worst channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If conventional channel quality feedback methods are used, then complete channel quality information can be provided, but feedback overhead becomes excessively high
Solution Approach 1:
The patent applies segmentation by dividing the channel quality index range into multiple disjoint subsets. Instead of reporting the complete CQI index, UEs report only the subset index and an offset value, which together reconstruct the original CQI information. This segmentation reduces the number of bits required for feedback while preserving the ability to represent all possible channel quality conditions.
2Quantity of substance
If disjoint segmentation with varying subset lengths is implemented, then feedback overhead is reduced, but the complexity of encoding and decoding increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the disjoint subset structure and boundary information through higher-layer signaling before actual channel quality feedback occurs. This allows UEs to have the subset configuration stored and readily available, eliminating the need for real-time calculation of subset boundaries and reducing encoding complexity during actual feedback transmission.
3Productivity
If the number of bits for encoded index is reduced, then feedback efficiency improves, but the ability to represent all channel quality levels is compromised
Solution Approach 1:
The patent applies dimensionality change by introducing a two-dimensional representation for channel quality feedback: the first dimension is the subset index (identifying which range the CQI falls into), and the second dimension is the offset value (position within that subset). This two-dimensional approach allows complete reconstruction of the original CQI value using fewer bits in the first dimension, thereby improving feedback efficiency while preserving measurement precision.
Data Source
AI summary
The method for feedback of channel quality information in a wireless communication system, according to one embodiment of the present invention, is performed by a terminal and comprises the steps of: receiving feedback configuration information, including information on disjoint segmentation indicating the indexes of channel or beam quality-related parameters for broadcast or multicast services, from a base station; and according to the information on disjoint segmentation in the feedback configuration information, encoding the index of a channel or beam quality-related parameter to be reported and transmitting same to the base station, wherein the disjoint segmentation includes multiple subsets which do not overlap and which have different lengths, and the index of the channel or beam quality-related parameter, which is transmitted to the base station, may indicate a predetermined value in one subset among the multiple subsets.