Mixed Criticality PPDU MCS Segmentation for Wi-Fi
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Solution Overview
Problem
Current Wi-Fi protocols constrain the use of a single modulation and coding scheme (MCS) for the entire physical layer protocol data unit (PPDU), resulting in a trade-off between reliability and throughput, especially when handling mixed criticality messages.
Innovation Solution
Implementing a method where an access point determines multiple MCSs for different sets of orthogonal frequency duplex multiplexing (OFDM) symbols and aggregates them into a single PHY service data unit (PSDU), allowing for enhanced robustness and throughput by using differentiated MCS levels within a single PPDU.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single MCS is used for the entire PPDU, then device complexity is reduced and ease of operation is improved, but reliability deteriorates when handling mixed criticality messages
Solution Approach 1:
The PPDU is segmented into multiple parts, each with its own MCS. The patent introduces a differentiator field that identifies whether the PPDU contains a single MCS or multiple MCSs. When multiple MCSs are used, each data unit within the PPDU is associated with a specific MCS index, allowing different criticality levels to be handled with appropriate modulation and coding schemes while maintaining overall system structure.
Solution Approach 2:
Different parts of the PPDU are assigned different MCS characteristics based on their criticality requirements. High criticality data units use more robust MCS (lower modulation order, higher coding rate) while low criticality data units use less robust but higher throughput MCS. This local differentiation allows each segment to be optimized for its specific requirements rather than using a uniform approach.
2Productivity
If a single MCS is used for the entire PPDU, then device complexity is reduced, but throughput deteriorates when handling mixed criticality messages
Solution Approach 1:
The PPDU is segmented into multiple parts, each with its own MCS. The patent introduces a differentiator field that identifies whether the PPDU contains a single MCS or multiple MCSs. When multiple MCSs are used, each data unit within the PPDU is associated with a specific MCS index, allowing different criticality levels to be handled with appropriate modulation and coding schemes while maintaining overall system structure.
Solution Approach 2:
The patent changes the MCS parameters (modulation order and coding rate) based on the criticality of different data units. By selecting from a set of predefined MCS indices, the system can dynamically adjust the robustness and throughput characteristics of each segment within the PPDU, optimizing overall productivity for mixed criticality traffic patterns.
3Reliability
If multiple MCSs are used within a single PPDU, then reliability is improved for mixed criticality messages, but device complexity increases
Solution Approach 1:
The PPDU is segmented into multiple parts, each with its own MCS. The patent introduces a differentiator field that identifies whether the PPDU contains a single MCS or multiple MCSs. When multiple MCSs are used, each data unit within the PPDU is associated with a specific MCS index, allowing different criticality levels to be handled with appropriate modulation and coding schemes while maintaining overall system structure.
Solution Approach 2:
Different parts of the PPDU are assigned different MCS characteristics based on their criticality requirements. High criticality data units use more robust MCS (lower modulation order, higher coding rate) while low criticality data units use less robust but higher throughput MCS. This local differentiation allows each segment to be optimized for its specific requirements rather than using a uniform approach.
4Productivity
If multiple MCSs are used within a single PPDU, then throughput is improved for mixed criticality messages, but device complexity increases
Solution Approach 1:
The PPDU is segmented into multiple parts, each with its own MCS. The patent introduces a differentiator field that identifies whether the PPDU contains a single MCS or multiple MCSs. When multiple MCSs are used, each data unit within the PPDU is associated with a specific MCS index, allowing different criticality levels to be handled with appropriate modulation and coding schemes while maintaining overall system structure.
Solution Approach 2:
The patent changes the MCS parameters (modulation order and coding rate) based on the criticality of different data units. By selecting from a set of predefined MCS indices, the system can dynamically adjust the robustness and throughput characteristics of each segment within the PPDU, optimizing overall productivity for mixed criticality traffic patterns.
Data Source
AI summary
An access point may include a processing device. The processing device may determine, at a medium access control (MAC) layer, a first modulation and coding scheme (MCS) for a first set of orthogonal frequency duplex multiplexing (OFDM) symbols. The processing device may determine, at the MAC layer, a second MCS for a second set of OFDM symbols. The processing device may generate, at the MAC layer, one or more aggregate MAC protocol data units (A-MPDUs) including the first MCS and the second MCS. The processing device may send, from the MAC layer to a physical layer (PHY), the one or more A-MPDUs to generate a PHY service data unit (PSDU) including the first MCS and the second MCS.