Uplink Multi-User Transmit Duration Control for Wi-Fi Coexistence
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Solution Overview
Problem
Existing wireless communication technologies, such as IEEE 802.11ax, face challenges in uplink multi-user communication due to uncertainty in transmission duration, leading to inefficiencies and interference with coexisting radio activities, as current disable bits either forbid all uplink OFDMA operations or fail to satisfy coexistence requirements.
Innovation Solution
An electronic device selectively provides a trigger frame that specifies a maximum uplink multi-user transmit duration, allowing for controlled scheduling and negotiation of uplink OFDMA or MIMO operations, reducing uncertainty in transmission duration and enabling concurrent operation of Wi-Fi and other radios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the uplink multi-user data disable bit is used to enable short uplink OFDMA transmission, then data transmission is disabled, but management frame transmission is not disabled causing long transmission time
Solution Approach 1:
The patent segments the uplink OFDMA transmission into two distinct types: data frame transmission and management frame transmission. By introducing separate control mechanisms for each type, the system can apply different duration constraints appropriately. Data frames are limited to short durations when the disable bit is set, while management frames are excluded from uplink OFDMA entirely, preventing long transmission times and interference with other radio activities.
Solution Approach 2:
Instead of trying to make management frames short to reduce interference, the patent inverts the approach by completely disabling management frame transmission in uplink OFDMA. This reversal of the conventional approach (where both data and management frames are allowed) effectively eliminates the interference problem caused by long management frame transmissions while preserving the benefits of short data frame transmissions.
2Object-affected harmful factors
If timesharing is used between Wi-Fi radio and other radios, then interference is avoided, but communication efficiency decreases
Solution Approach 1:
The patent implements a feedback mechanism where the client device informs the access point of its maximum uplink transmit duration capability through the uplink multi-user data disable bit. The access point uses this feedback information to make scheduling decisions, selecting clients with shorter maximum durations for uplink OFDMA transmissions. This feedback loop enables the system to optimize resource allocation based on actual client capabilities, improving communication efficiency while preventing interference with other radio activities.
Solution Approach 2:
The patent changes the scheduling parameter from a binary timesharing approach (either Wi-Fi or other radio active) to a continuous optimization approach using maximum transmit duration as a scheduling parameter. By using the maximum uplink transmit duration value to guide scheduling decisions, the system can dynamically adjust resource allocation to minimize interference while maximizing spectral efficiency, rather than relying on rigid timesharing schedules.
Data Source
AI summary
An electronic device that selectively provides a trigger frame is described. During operation, the electronic device may receive a frame from a recipient electronic device, where the frame includes information that specifies a maximum uplink multi-user transmit duration of the recipient electronic device. Moreover, the electronic device may selectively provide the trigger frame to the recipient electronic device that specifies an uplink OFDMA frame or an uplink MIMO frame associated with the recipient electronic device. The trigger frame may be selectively provided when a transmit time corresponding to the uplink OFDMA frame or the uplink MIMO frame is less than or equal to the maximum uplink multi-user transmit duration.