Link Adaptation Parameter Subsets for Lower Downlink Control Overhead
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Solution Overview
Problem
Existing communication systems require large amounts of downlink control information to indicate modulation and coding schemes and transmission repetition numbers, leading to resource inefficiency due to the need to indicate a wide range of parameters for link adaptation.
Innovation Solution
A method and apparatus for determining and indicating a subset of link adaptation parameters, reducing the number of parameters to be indicated by selecting from a predefined subset based on channel state information or preconfigured associations, thereby reducing the number of bits required for indication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the base station indicates all possible modulation and coding schemes and transmission repetition numbers through downlink control information, then the terminal can adapt to all possible link states, but the amount of downlink control information becomes excessively large
Solution Approach 1:
The patent segments the full set of link adaptation parameters into multiple subsets, where each subset contains a limited number of parameters. The base station selects and indicates only the relevant subset based on current channel conditions, rather than indicating all possible parameters. This segmentation reduces the control information burden while maintaining adequate link adaptation capability for various channel states.
Solution Approach 2:
The patent applies local quality by differentiating between different parameter subsets based on their relevance to specific channel conditions. Different subsets are designed with different parameter compositions tailored to specific transmission scenarios (e.g., coverage-enhanced modes vs. normal modes), allowing efficient parameter indication for each local condition without requiring comprehensive parameter listing for all conditions.
2Measurement precision
If the base station uses a large number of bits to indicate link adaptation parameters, then all possible parameters can be precisely indicated, but communication resources are wasted
Solution Approach 1:
The patent implements dynamic parameter subset selection where the base station adapts the indicated parameter subset based on real-time channel conditions and transmission requirements. The number of bits required for indication varies dynamically depending on the selected subset size and the specific channel state, optimizing the balance between indication precision and resource consumption rather than using a fixed large bit allocation.
Solution Approach 2:
The patent changes the parameter representation by organizing link adaptation parameters into discrete subsets with different sizes and compositions. Instead of using a fixed large-bit representation for all parameters, the system changes the parameter set being indicated based on channel conditions, thereby changing the required bit length dynamically to match actual needs and reduce wasted communication resources.
Data Source
AI summary
The present disclosure provides a method and apparatus for indicating link adaptation parameters, and a method and apparatus for determining link adaptation parameters. The method for indicating link adaptation parameters can include determining a link adaptation parameter subset from a link adaptation parameter set, wherein the link adaptation parameter subset includes one or more link adaptation parameters, and transmitting indication information for indicating a target link adaptation parameter to a terminal, wherein the target link adaptation parameter is a link adaptation parameter in the link adaptation parameter subset.