Negotiating Preamble Extension Duration for Wi-Fi 7 Stations
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Solution Overview
Problem
The existing 802.11be amendment (Wi-Fi 7) protocols are inefficient due to the fixed duration of preambles in Physical Protocol Data Units (PPDUs), which hinders the ability to adjust for stations transitioning to higher capability modes for improved performance.
Innovation Solution
A method is introduced where stations negotiate with Access Points (APs) to adjust the duration of the extension portion of the preamble in PPDUs, allowing for flexible parameter settings such as modulation and coding schemes, spatial streams, and data throughput, to accommodate higher capability operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed duration preamble is used in PPDU, then the protocol structure is simple and reliable, but the station cannot efficiently transition to higher capability modes and medium access efficiency degrades
Solution Approach 1:
The patent applies the dynamics principle by making the preamble duration adjustable rather than fixed. The extension portion of the preamble can be configured with different durations (e.g., 16, 32, 64, 96, or 128 microseconds) based on the station's capability mode and transmission requirements. This dynamic adjustment allows the system to optimize medium access efficiency for stations transitioning to higher capability modes while maintaining protocol simplicity.
Solution Approach 2:
The patent implements parameter changes by introducing variable duration parameters for the preamble extension portion. Instead of a fixed duration, the system allows configuration of the extension duration parameter based on station capabilities, modulation and coding schemes, and transmission rates. This enables optimization of the preamble duration to match the actual transition requirements of stations operating in higher capability modes.
2Productivity
If the preamble duration is extended to allow station transition to higher capability modes, then station performance improves, but the transmission time increases
Solution Approach 1:
The patent applies parameter changes by adjusting the preamble extension duration parameter to match the station's capability mode and transmission requirements. For stations transitioning to higher capability modes, the extension duration can be set to provide sufficient transition time (e.g., 64 or 128 microseconds), while for lower capability modes, shorter durations (e.g., 16 or 32 microseconds) are used. This optimized parameter adjustment balances transition requirements with transmission efficiency.
Solution Approach 2:
The system dynamically adjusts the preamble duration based on real-time conditions including station capability mode, modulation and coding scheme, and transmission rate. This dynamic adaptation ensures that the preamble extension provides sufficient time for station transition when needed while minimizing unnecessary duration extensions that would waste transmission time.
3Productivity
If MU RTS/CTS protocol is used to trigger station operation change, then station can switch to higher capability mode, but the process is time-consuming and degrades medium access efficiency
Solution Approach 1:
The patent applies preliminary action by incorporating transition timing information directly into the preamble extension portion of the PPDU before the actual data transmission begins. The preamble extension duration is pre-configured to accommodate the station's transition requirements, eliminating the need for separate MU RTS/CTS frames to trigger capability changes. This preliminary setup reduces transition time and improves medium access efficiency.
Solution Approach 2:
The patent extracts the transition timing function from the separate MU RTS/CTS protocol and integrates it directly into the preamble extension portion of the PPDU. By taking out the transition timing information and embedding it in the preamble, the system eliminates the time-consuming separate trigger frames while maintaining the ability to coordinate station capability transitions efficiently.
Data Source
AI summary
A method and system for negotiating a duration of an extension portion of a preamble are disclosed. In a PPDU, a preamble extension has several forms. A station and an access point (AP) negotiate to select one or more of the forms suited to a change in the operation of the station. When the change is increased data throughput, the station sends one or more throughput-related parameters in a proposal to the AP. When the change is the number of spatial streams, the station sends the number as a parameter in the proposal. When the change is a different coding set, then the coding set is sent as the parameter in the proposal. The AP responds to the proposal which fixes the values of the parameters and the duration of the extension portion of the preamble.