Uplink Multi-User Mode Latency Optimization via Exclusion Bit
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Solution Overview
Problem
In wireless local area networks (WLANs) operating in uplink multi-user mode, there is a challenge in efficiently transmitting low latency data that corresponds to access categories (ACs) or traffic identifiers (TIDs) excluded from this mode, due to the delayed channel access caused by the MU-EDCA timer.
Innovation Solution
A method where a wireless device determines the presence of low latency data and sets an exclusion bit in the operating mode control subfield of a transmit operating mode indicator frame, allowing it to transmit this data using a single user PPDU through enhanced distributed channel access (EDCA) after excluding it from uplink multi-user mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink multi-user mode is used for data transmission, then channel access efficiency is improved, but latency for excluded access categories increases due to MU-EDCA timer delays
Solution Approach 1:
The patent segments the uplink transmission mode by excluding specific access categories (ACs) or traffic identifiers (TIDs) from uplink multi-user mode using an exclusion bit in the operating mode control subfield. This allows low latency data in excluded ACs to use single user PPDU with EDCA function, while other data continues to use uplink multi-user mode, thus resolving the latency issue for specific traffic types without sacrificing overall channel access efficiency
Solution Approach 2:
The patent dynamically switches transmission modes based on the exclusion bit setting. When the exclusion bit is set to 1, the wireless device transitions from uplink multi-user mode to single user PPDU mode for excluded ACs, enabling adaptive channel access that optimizes latency performance for time-sensitive traffic while maintaining multi-user efficiency for other traffic
2Loss of time
If single user PPDU with EDCA function is used for low latency data, then transmission latency is reduced, but channel access overhead increases
Solution Approach 1:
The patent applies different transmission qualities to different traffic types by using the exclusion bit to identify which ACs or TIDs should receive optimized single user PPDU treatment. This local quality enhancement ensures that only latency-sensitive traffic incurs the overhead of EDCA-based channel contention, while other traffic benefits from efficient multi-user mode without additional overhead
Data Source
AI summary
A method performed by a wireless device operating in an uplink multi-user mode is described. The method includes determining that a condition exists to prompt the wireless device to transmit an unsolicited low latency presence frame to an access point to solicit transmission of a solicited control frame from the access point; transmitting the unsolicited low latency presence frame to the access point, the unsolicited low latency presence frame indicating a type of solicited control frame requested by the wireless device; receiving a solicited control frame from the access point, the solicited control frame comprising information relating to the unsolicited low latency presence frame; and performing an action based on the received solicited control frame.