Bandwidth Coding in Channel Bonding Access via Parity Bits
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Solution Overview
Problem
Modern wireless communication techniques using channel bonding are not compatible with legacy devices, as they require different channel access rules, leading to incompatibility issues.
Innovation Solution
Encoding bandwidth information within the parity bits of the PHY header in RTS and CTS frames, using LDPC or Hadamard codes, to indicate channel usage without interfering with legacy device decoding, ensuring backwards compatibility and providing error correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel bonding is implemented for modern wireless transmissions, then communication robustness and bandwidth are improved, but compatibility with legacy devices deteriorates
Solution Approach 1:
The patent segments the PHY header into distinct functional parts: legacy-compatible fields that legacy devices can decode, and encoded bandwidth fields that modern devices can interpret. This segmentation allows different device types to access different portions of the header appropriately, resolving the compatibility conflict.
Solution Approach 2:
The patent introduces an intermediary encoding scheme using parity bits to convey bandwidth information. This intermediary representation allows legacy devices to ignore the encoded portion while modern devices can decode it, serving as a mediator between the two device types without requiring either to change fundamentally.
2Loss of information
If bandwidth information is added to RTS and CTS frames for channel bonding, then channel usage indication is improved, but packet structure complexity increases
Solution Approach 1:
The patent merges the bandwidth indication function with the existing parity bit structure of the PHY header. By combining channel bonding information with the error correction code structure, the patent avoids adding separate overhead fields, thus improving information conveyance without proportionally increasing packet structure complexity.
Solution Approach 2:
The parity bits serve multiple functions: they provide error correction for legacy devices and simultaneously encode bandwidth information for modern devices. This multi-functionality eliminates the need for separate dedicated fields, reducing overall packet structure complexity while maintaining comprehensive information indication.
3Reliability
If parity bits are used for encoding bandwidth information, then error correction capability is improved, but available error correction redundancy decreases
Solution Approach 1:
The patent applies partial encoding by using only a subset of the parity bits for bandwidth information rather than encoding all bandwidth data. This partial action preserves sufficient redundancy in the parity bits to maintain error correction capability while still conveying necessary bandwidth indication information to modern devices.
Data Source
AI summary
Disclosed herein are techniques to provide an indication of bandwidth to establish a TxOP using channel bonding. An information element may be generated to include an RTS frame or a CTS frame and an indication of bandwidth in a parity portion of the information element. The indication of bandwidth may be included by using 16 bits of the parity bits of parity bytes for a PHY header of the information element.