WiFi Control Frame Header Merging for Bandwidth Reduction
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Solution Overview
Problem
In communication systems using shared radioelectric or optical transmission channels, control frames occupy a significant portion of the channel bandwidth and are complex to modulate, especially in energy-constrained devices like those in WiFi, due to the need for dual modulation techniques and the presence of a MAC header, which increases energy consumption and reduces robustness.
Innovation Solution
The method involves inserting information related to the second layer (MAC layer) into the first layer's header field, eliminating the need for a separate MAC header and allowing only one modulation technique, specifically the more robust PLCP layer modulation, thereby shortening control frames and reducing bandwidth and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a separate MAC header is used in control frames, then information organization is clear and structured, but the control frame length increases and bandwidth usage increases
Solution Approach 1:
The patent merges the MAC header information with the PLCP header by inserting second layer (MAC) information directly into the first layer (PLCP) header field. This consolidation eliminates the need for a separate MAC header structure, thereby reducing control frame length while maintaining organized information transmission through the unified header format.
2Adaptability or versatility
If dual modulation techniques are used for MAC header and PLCP header, then each layer can be optimized for its specific requirements, but the modulation process becomes complex and energy consumption increases
Solution Approach 1:
The patent applies a single modulation technique (BPSK) to the unified header that carries both PLCP and MAC information. This universal approach eliminates the need for separate modulation processes for different layers, reducing modulation complexity and energy consumption while still allowing layer-specific information to be transmitted through the same modulated signal structure.
3Adaptability or versatility
If dual modulation techniques are used, then layer-specific optimization is achieved, but energy consumption increases
Solution Approach 1:
The patent uses a single modulation technique (BPSK) for the unified header containing both PLCP and MAC information, eliminating the need for separate modulation operations. This reduces the computational complexity and energy consumption of the modulation process while maintaining the ability to transmit layer-specific information through the unified structure.
4Loss of information
If a MAC header is present in control frames, then complete information is transmitted, but robustness decreases due to higher bit rate modulation requirements
Solution Approach 1:
The patent combines MAC information with PLCP header information into a single header structure that is modulated using the more robust BPSK technique. This merging allows complete information transmission while benefiting from the higher robustness of BPSK modulation, as the unified header can be reliably decoded even in challenging channel conditions.
Data Source
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AI summary
The invention includes a method for receiving a control frame by a receiving entity (ER1) from a transmitting entity (EE1), according to the WiFi protocol comprising a PLCP layer and a MAC layer, the control frame (RTS1) comprising a header SIG field (SIG') of the PLCP layer, the method comprising a demodulation step (R2), according to a modulation technique relating to the PLCP layer, an extraction step (R3) of a parameter (partial RA) from the MAC layer intended to identify a receiving entity of the control frame, from the demodulated SIG field, a detection step of a correspondence between the extracted parameter and an identifier of the receiving entity (ER1), and a transfer step (R4) of the parameter to the MAC layer.