Wireless MCS Table Selection for 256 QAM Throughput Gaps
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face inefficiencies in throughput due to modulation schemes that provide lower performance despite having higher complexity, particularly when using high modulation orders like 256 QAM, and existing MCS and CQI tables do not optimize throughput effectively across varying signal-to-noise ratios.
Innovation Solution
The introduction of new MCS and CQI tables that dynamically adjust modulation schemes based on channel conditions, incorporating optimized indices and indices adjustments to enhance throughput by using modulation schemes different from traditional tables, particularly in certain SNR regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a modulation scheme with high modulation order (e.g., 256 QAM) is used to increase throughput, then the maximum throughput is increased by 33% or more compared to 64 QAM, but the throughput becomes lower than low modulation order schemes in certain SNR situations due to high complexity
Solution Approach 1:
The patent implements dynamic selection of MCS tables based on channel conditions. The system switches between different MCS tables (first table with up to 64 QAM, second table with up to 256 QAM, third table with modified 256 QAM support) according to the received table indication information and current SNR levels. This dynamic adaptation allows the system to use high-order modulation when channel conditions are good while falling back to lower-order modulation when complexity becomes problematic, thereby resolving the contradiction between throughput and complexity.
Solution Approach 2:
The patent changes the modulation order parameter dynamically by selecting different MCS tables. The third MCS table specifically modifies the mapping between MCS indices and modulation schemes, reducing the number of 256 QAM indices compared to the second table. This parameter change allows the system to adapt the modulation order to match current channel quality, achieving high throughput when possible while avoiding the complexity penalties when SNR is insufficient.
2Productivity
If multiple MCS tables supporting different modulation orders are introduced to adapt to different SNR conditions, then throughput is optimized across various channel qualities, but the system complexity increases due to managing multiple tables and selection mechanisms
Solution Approach 1:
The patent prepares multiple MCS tables in advance, each optimized for different SNR conditions and complexity requirements. The first MCS table is prepared for up to 64 QAM, the second for up to 256 QAM, and the third with modified 256 QAM support. By having these tables pre-configured and ready, the system avoids the complexity of real-time modulation scheme design while still achieving adaptive optimization through simple table selection based on pre-defined criteria.
Solution Approach 2:
The patent introduces table indication information as an intermediary mechanism that simplifies the management of multiple MCS tables. Instead of complex real-time analysis and selection algorithms, the system uses this intermediary signaling mechanism to indicate which MCS table should be used. This intermediary approach decouples the complexity of table management from the throughput optimization goal, allowing the system to maintain multiple optimized tables without proportionally increasing operational complexity.
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
A wireless communication method including receiving, through a wireless channel, table indication information indicating one of a first Modulation and Coding Scheme (MCS) table supporting up to 64 Quadrature Amplitude Modulation (QAM) and second and third MCS tables supporting up to 256 QAM, the third MCS table including a same number of MCS indices as the second MCS table and including less MCS indices corresponding to 256 QAM than the second MCS table, and identifying one of the first to third MCS tables according to the received table indication information to recognize a demodulation scheme for data to be received through the wireless channel may be provided.