Intermediate FCS in Initial Control Frames for Early Channel Switching
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in medium use, throughput, latency, and scheduling flexibility due to the presence of multiple generations of wireless devices with varying capabilities, necessitating improvements in initial control frame designs to accommodate diverse packet formats and bandwidths.
Innovation Solution
Incorporation of per-user frame check sequences (FCS) in initial control frames to allow early channel or operation mode switching for devices requiring channel or operation mode changes, reducing the need for padding and enhancing medium use efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If padding is added to initial control frames to meet padding delay requirements for channel switching, then medium use efficiency deteriorates due to increased frame size and transmission time, but device reliability improves as devices have sufficient time to switch channels or operation modes
Solution Approach 1:
The patent divides the frame check sequence verification into two parts: a first FCS field verifies a first portion of the initial control frame, and a second FCS field verifies a second portion. This segmentation allows receiving devices to perform incremental verification and proceed with channel switching as soon as the critical first portion is verified, without waiting for the entire frame including padding to be transmitted.
Solution Approach 2:
The patent places the first FCS field at an earlier position in the initial control frame, before the padding section. This preliminary placement of verification capability allows devices to perform FCS checking and initiate channel switching operations before the padding transmission is complete, effectively using the padding period for other purposes while maintaining reliability.
2Productivity
If per-user frame check sequences are included in initial control frames, then medium use efficiency improves by reducing padding requirements, but device complexity increases due to additional FCS fields and verification logic
Solution Approach 1:
The patent implements different FCS verification requirements for different portions of the initial control frame. The first FCS field provides verification for the critical first portion that contains channel switching information, while the second FCS field verifies the remaining portion including padding. This local differentiation allows devices to perform minimal verification to enable channel switching, reducing overall complexity while improving efficiency.
3Reliability
If padding delay requirements are enforced for all devices, then device reliability improves with sufficient switching time, but latency increases for devices that do not require channel switching
Solution Approach 1:
The patent enables dynamic verification where devices can perform FCS checking on the first portion of the initial control frame and proceed with operation mode switching as soon as verification is complete, without being constrained by fixed padding delay requirements. This dynamic approach allows devices that need to switch modes to do so earlier, reducing latency for time-sensitive operations while maintaining reliability through the first FCS field verification.
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 an intermediate frame check sequence may be transmitted from an access point to multiple recipient wireless devices. An intermediate frame check sequence may be located between the last user info field and the Padding field of the initial control frame. The recipient wireless device may perform a frame check sequence check for the initial control frame using the intermediate frame check sequence.