Multicast Channel Feedback Aggregation for Lower Signaling Overhead
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in multicast transmission due to the difficulty in efficiently determining transmission parameters for multiple terminals with varying channel conditions, leading to increased overhead and reduced efficiency.
Innovation Solution
A method where a base station allocates a feedback channel to terminals, which share resources for channel feedback, allowing terminals to determine transmission power levels and encode feedback information as an M-bit string, enabling the base station to determine optimal transmission parameters based on combined channel feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station determines transmission parameters for each terminal individually based on channel feedback, then the transmission reliability is improved, but the overhead and complexity increase significantly
Solution Approach 1:
The patent combines channel feedback from multiple terminals into a single aggregated feedback value. Instead of processing individual feedback from each terminal, the base station collects feedback values from all terminals and determines transmission parameters based on the aggregated result, thereby reducing system complexity while maintaining reliability through group-based parameter determination
Solution Approach 2:
The patent creates a universal feedback mechanism where a single aggregated feedback value serves all terminals in the multicast group. The base station determines a common transmission parameter set that can be universally applied to all terminals, eliminating the need for individual parameter determination for each terminal
2Productivity
If the base station collects channel feedback from all terminals to determine optimal transmission parameters, then the transmission efficiency is improved, but the feedback overhead increases
Solution Approach 1:
The patent merges multiple individual feedback values into a single aggregated feedback value. Each terminal provides a feedback value, and the base station aggregates these values (e.g., through summation or other combination methods) to obtain a collective channel state representation, significantly reducing the quantity of feedback data that needs to be processed
Solution Approach 2:
The patent extracts only the essential channel state information needed for multicast transmission parameter determination. Instead of transmitting complete channel state data from each terminal, the system extracts and transmits simplified feedback values that capture the critical channel conditions while minimizing overhead
3Reliability
If the base station determines transmission parameters based on worst-case channel conditions, then the reliability for all terminals is improved, but the transmission speed and efficiency decrease
Solution Approach 1:
The patent changes the parameter determination approach from worst-case scenario planning to aggregated feedback-based optimization. Instead of selecting parameters that guarantee reception for the worst channel condition, the system uses aggregated feedback from all terminals to determine parameters that optimize overall transmission performance, allowing for higher transmission speeds while maintaining acceptable reliability
Data Source
AI summary
A method of receiving multicast transmission from a base station includes receiving allocation information about a feedback channel including a plurality of resources shared by another terminal, determining feedback information based on an estimated channel with the base station, determining a plurality of transmission power levels respectively corresponding to the plurality of resources based on the feedback information, and transmitting channel feedback to the base station on the feedback channel based on the plurality of transmission power levels.