Wireless Frame Padding Fields for MAC and Control Protection
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Solution Overview
Problem
Existing wireless communication technologies face challenges in efficiently managing padding to align frames with byte boundaries, ensuring proper processing, and meeting encryption requirements, while also addressing fragmentation and security issues in IEEE 802.11-based WLANs, particularly in advanced standards like IEEE 802.11bn and future generations.
Innovation Solution
Implementing padding techniques that provide separate padding fields for different processing requirements, such as Control frame protection and MAC header protection, to ensure sufficient time for decoding and preparing responsive frames, and supporting features like Dynamic Power Save and Dynamic Sub-Channel Optimization, while maintaining security and reducing packet eavesdropping risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If padding bits are added to frames to ensure proper alignment for processing and encryption, then frame processing reliability and security are improved, but frame length increases and transmission efficiency deteriorates
Solution Approach 1:
The patent segments the frame structure by introducing distinct padding fields at different locations: a first padding field after the MAC header for alignment purposes, and a second padding field at the end of the data portion for encryption block alignment. This segmentation allows each padding field to serve its specific function independently, ensuring both processing reliability and minimizing unnecessary padding overhead.
2Reliability
If padding bits are added to meet encryption algorithm size requirements, then encryption security is improved, but frame structure complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating the required padding length based on the encryption algorithm's block size requirements and the actual data length. The padding field is designed with a predetermined maximum length that can be dynamically adjusted. This approach ensures encryption security is maintained while avoiding the complexity of dynamic reallocation or multiple frame restructuring operations.
3Reliability
If multiple padding fields are introduced for different processing requirements, then processing time for frame integrity checks is improved, but frame length and transmission overhead increase
Solution Approach 1:
The patent applies local quality by placing specific padding fields at specific locations within the frame structure where they are most needed. The first padding field is positioned immediately after the MAC header to facilitate local alignment operations for header processing. The second padding field is positioned at the end of the data portion to ensure proper alignment for encryption/decryption operations. This localized approach improves processing reliability without adding unnecessary padding throughout the entire frame.
Data Source
AI summary
Methods and apparatus for providing padding in relation to various padding requirements. In an example method, a wireless device receives padding requirement information from a second wireless device, the padding requirement information relating to one or more of a padding requirement for Control frame protection or MAC header protection, a padding requirement for switching from a low capability (LC) mode to a high capability (HC) mode, a padding requirement for switching from a primary channel to a secondary channel or Dynamic Sub-Channel Optimization (DSO) channel, or a padding requirement for switching from an Enhanced Multi-Link Single Radio (eMLSR) listening mode to a frame exchange mode. The wireless device generates a physical layer (PHY) protocol data unit (PPDU) including one or more padding fields in accordance with the padding requirement information received from the second wireless device. The wireless device further transmits the PPDU including the one or more padding fields for reception by the second wireless.