Dynamic MCS Selection for WLAN Throughput and Legacy Compatibility
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Solution Overview
Problem
Existing wireless communication systems face challenges in achieving high data throughput while maintaining backward compatibility with legacy devices, particularly in wireless local area networks (WLANs), as most WLANs include legacy devices compliant with older standards, limiting the adoption of advanced MIMO communications.
Innovation Solution
A wireless communication device and system that employs a method for selecting an appropriate modulation coding set (MCS) and operational parameters to ensure compatibility with legacy devices, using multiple antennae and advanced encoding techniques like spatial and time encoding, while supporting high data throughput by adapting transmission rates and modulation schemes based on channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MIMO communications are adopted to achieve high data throughput, then data transmission rate is improved, but compatibility with legacy devices deteriorates
Solution Approach 1:
The patent implements dynamic MCS selection where the modulation coding set is adaptively chosen based on channel conditions and device capabilities. The system can switch between different MCS indices to optimize throughput while ensuring legacy devices receive compatible transmissions, resolving the contradiction between high productivity and adaptability.
Solution Approach 2:
The patent changes transmission parameters (MCS index, modulation scheme, coding rate) based on detected channel conditions and device support. By dynamically adjusting these parameters, the system achieves high throughput with advanced devices while maintaining compatibility with legacy devices that support only basic modulation schemes.
2Speed
If advanced encoding techniques are used to improve data rate, then transmission speed is improved, but system complexity increases
Solution Approach 1:
The patent employs dynamic selection of encoding techniques based on channel conditions. Simple encoding schemes are used when channel conditions are poor or for legacy devices, while advanced spatial and time encoding are activated only when channel conditions warrant the additional complexity, thus improving speed without unnecessarily increasing system complexity.
Solution Approach 2:
The patent adjusts encoding parameters (code rate, block length, spatial streams) based on measured channel quality. This allows the system to achieve high transmission speeds when conditions permit while falling back to simpler, lower-complexity encoding when conditions deteriorate, balancing speed and complexity dynamically.
3Productivity
If transmission rate is increased to achieve high throughput, then data rate is improved, but reliability of communication deteriorates
Solution Approach 1:
The patent implements dynamic MCS selection that continuously adapts to channel conditions. When channel quality is good, higher MCS indices are selected for maximum throughput. When channel quality degrades, the system automatically selects lower MCS indices with more robust error protection, thus maintaining reliability while optimizing throughput based on real-time conditions.
Solution Approach 2:
The patent uses feedback mechanisms where the receiving device reports channel quality metrics and acknowledgment status to the transmitting device. This feedback enables the transmitter to adjust the MCS index appropriately, ensuring reliable communication at the highest possible data rate by selecting modulation and coding schemes that match current channel conditions.
Data Source
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AI summary
Response frame modulation coding set (MCS) selection within single user, multiple user, multiple access, and/or MIMO wireless communications. With respect to any exchange between communication devices in which there is a response frame, a first frame (e.g., an eliciting frame) is a first transmitted from the eliciting communication device to the responding communication device, and a second frame (e.g., a response frame) is transmitted from the responding communication device to the eliciting communities device. Appropriate selection of MCS to be used within the response frame may be determined explicitly or implicitly. One or more parameters (e.g., a limit parameter, a reduction parameter, etc.) may be used to determine the MCS of the response frame. The MCS employed for a response frame may be selected from a basic MCS set that ensures all response frames from any responding communication device may be properly received by the eliciting communication device.