Initial Control Frames with Per-User FCS for Early Channel Switching
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Solution Overview
Problem
Wireless communication systems face challenges in accommodating diverse wireless devices with varying capabilities, leading to inefficiencies in medium use, throughput, latency, and scheduling flexibility, particularly in operations requiring channel or operation mode switching.
Innovation Solution
Incorporating per-user frame check sequences (FCS) in initial control frames to allow early channel or operation mode switching for devices needing padding delay, reducing the need for additional padding and enhancing medium use efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If per-user frame check sequences are included in initial control frames, then medium use efficiency is improved and channel switching can occur earlier, but device complexity increases due to additional FCS processing requirements
Solution Approach 1:
The patent divides the traditional single FCS check into multiple per-user FCS checks within the initial control frame. Each user's data portion has its own FCS sequence, allowing individual verification and early channel switching decisions without waiting for the entire frame to be received and verified.
Solution Approach 2:
The per-user FCS sequences are placed before the end of the initial control frame transmission, enabling devices to perform FCS verification in advance and make channel switching decisions earlier than with traditional end-of-frame FCS checking.
2Reliability
If padding is added to meet padding delay requirements for channel switching, then channel switching reliability is improved, but frame length increases and medium use efficiency decreases
Solution Approach 1:
The per-user FCS sequences enable preliminary verification before the frame transmission is complete, allowing devices to prepare for channel switching earlier and reduce or eliminate the need for padding to meet switching delay requirements.
3Reliability
If devices wait for the entire initial control frame to be received before switching channels, then frame integrity is ensured, but channel switching latency increases
Solution Approach 1:
By segmenting the FCS verification into per-user portions, devices can verify their specific user data integrity without waiting for the entire frame, enabling earlier channel switching while maintaining verification reliability.
Solution Approach 2:
Per-user FCS verification is performed preliminarily during frame reception rather than after complete frame reception, allowing devices to determine frame integrity early and proceed with channel switching without waiting for the entire initial control frame to be received.
Data Source
AI summary
This disclosure relates to methods for transmitting an initial control frame with pre-padding frame check sequence in a wireless local area network. An initial control frame that includes one or more per-user frame check sequences may be transmitted from an access point to multiple recipient wireless devices. Each per-user frame check sequence may be included in a user info field of the initial control frame corresponding to a recipient wireless device. The recipient wireless device may perform a frame check sequence check for the initial control frame using the per-user frame check sequence.