Adaptive Modulation Tables for Wireless Throughput
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems, particularly in small cell environments, are limited by not supporting higher-order modulations than 64-QAM, leading to reduced spectrum efficiency and throughput due to resource consumption by overhead signals and inefficient resource allocation.
Innovation Solution
Implementing higher-order modulation (HOM) transmission with multiple modulation and coding scheme (MCS) tables, channel quality index (CQI) tables, and advanced configuration methods to support HOM, including PDSCH over multiple frequency allocations and RE mapping, to enhance spectral efficiency and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher-order modulation (beyond 64-QAM) is implemented, then spectral efficiency and throughput are improved, but system complexity and overhead requirements increase
Solution Approach 1:
The patent segments the modulation scheme into multiple tables (first MCS table for QPSK/16QAM/64QAM, second MCS table for 256QAM and higher). This segmentation allows the system to selectively apply higher-order modulation only when channel conditions permit, rather than forcing complex modulation everywhere, thus improving throughput where possible while maintaining simplicity where unnecessary.
Solution Approach 2:
The patent implements dynamic selection between different MCS tables based on channel quality indicators (CQI). The system dynamically switches between the first and second MCS tables depending on whether the channel can support higher-order modulation, allowing adaptability that improves throughput in good conditions while avoiding unnecessary complexity in poor conditions.
2Productivity
If higher-order modulation is used, then spectral efficiency is improved, but overhead consumption increases
Solution Approach 1:
The patent introduces Channel Quality Indicator (CQI) feedback as an intermediary mechanism. The CQI feedback allows the system to assess channel conditions and selectively activate higher-order modulation only when the channel quality justifies the additional overhead, thus improving spectral efficiency while minimizing unnecessary overhead consumption.
Solution Approach 2:
The patent changes the modulation order parameter dynamically by selecting between different MCS tables. When channel conditions are favorable, the system transitions to higher-order modulation (256QAM and above) to improve spectral efficiency. When conditions are poor, it reverts to lower-order modulation, avoiding the overhead burden of complex modulation schemes that would not be reliably decoded.
3Adaptability or versatility
If multiple MCS tables are provided for HOM support, then modulation flexibility is improved, but configuration complexity increases
Solution Approach 1:
The patent segments the MCS configuration into two distinct tables: the first MCS table covering QPSK, 16QAM, and 64QAM, and the second MCS table covering 256QAM and higher. This segmentation provides modulation flexibility by allowing selection of appropriate tables based on channel conditions, while reducing configuration complexity by organizing options into manageable, predefined groups rather than requiring individual configuration of numerous modulation parameters.
Data Source
AI summary
Systems, methods, and/or techniques for improving downlink spectrum efficiency may be disclosed. For example, a higher order modulation (HOM) transmission may be provided to a device. The higher order modulation transmission may be configured to be indicated by the network or a device. Additionally, multiple modulation and coding scheme (MCS) tables, transport block size (TBS) tables, and/or channel quality index (CQI) tables may be provided to support the higher order modulation transmission.