Wireless RU Fragment Modulation for Channel Interference
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Solution Overview
Problem
In IEEE 802.11 WiFi systems, resource units (RUs) transmitted over non-primary 20 MHz channels experience higher interference due to varying clear channel assessment thresholds, leading to mismatched modulation and coding schemes with channel quality, resulting in suboptimal signal-to-noise ratios and throughput.
Innovation Solution
Transmitting RU fragments with unequal modulation in varying or different spatial streams, based on channel quality or interference statistics, to improve signal-to-noise ratios without changing data rates, allowing for efficient resource allocation and interference management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single modulation and coding scheme (MCS) is assigned to transmit RUs over multiple channels, then device complexity is reduced and ease of operation is improved, but signal-to-noise ratio deteriorates due to varying channel quality across channels
Solution Approach 1:
The patent segments the resource units (RUs) into different RU fragments that can be transmitted over different channels with different MCS values. Instead of applying a single MCS to all RUs across multiple channels, the system divides RUs into fragments and assigns appropriate MCS to each fragment based on the channel quality of the target channel, thereby resolving the contradiction between operational simplicity and signal-to-noise ratio performance.
Solution Approach 2:
The patent applies local quality by allowing different MCS values to be assigned to different RU fragments transmitted over different channels. Each RU fragment's modulation and coding scheme is optimized for the specific channel conditions of its target channel, rather than using a uniform MCS across all channels. This localized optimization improves signal-to-noise ratio while maintaining manageable system complexity through structured fragment handling.
2Reliability
If clear channel assessment threshold is set lower for primary channel to reduce interference, then reliability of primary channel transmission is improved, but productivity decreases due to higher interference on non-primary channels
Solution Approach 1:
The patent applies dynamics by making the MCS assignment adaptive to channel conditions rather than static. The system dynamically selects different MCS values for different RU fragments based on real-time channel quality assessments for each channel. This dynamic approach allows the system to optimize throughput on non-primary channels by using lower MCS only where necessary, while maintaining high MCS on channels with better conditions, thereby resolving the contradiction between reliability and productivity.
Solution Approach 2:
The patent changes the MCS parameter differently for different RU fragments transmitted over different channels. Instead of using a fixed MCS assignment, the system varies the modulation and coding parameters based on channel quality metrics such as signal-to-noise ratio and interference levels. This parameter adaptation allows optimal throughput on each channel while maintaining overall system reliability.
3Ease of operation
If MCS assignment is not correlated to channel quality to simplify operation, then ease of operation is improved, but manufacturing precision of transmission quality deteriorates
Solution Approach 1:
The patent implements feedback mechanisms where channel quality information is collected and used to determine appropriate MCS assignments for RU fragments. The system monitors channel conditions and uses this feedback to optimize the modulation and coding parameters for each RU fragment, ensuring consistent transmission quality across different channels while maintaining manageable operational complexity through automated quality assessment and MCS selection.
Data Source
AI summary
A method and system for wireless transmission comprises receiving bits of resource units (RU) at a physical layer processing unit of a wireless device. The bits of the RUs are parsed into a plurality of RU fragments carried by one or more spatial streams. One of the resource unit fragments is modulated with a first modulation and another of the resource unit fragments is modulated with a second modulation which is different from the first modulation. Each spatial stream carrying the resource units fragments which are modulated is then mapped to one or more antenna for wireless transmission.