Uplink Multi-User Exclusion for Low Latency
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Solution Overview
Problem
Existing wireless communication protocols, such as IEEE 802.11, face challenges in efficiently transmitting low latency data in uplink multi-user modes due to the suspension of specific access categories or traffic identifiers from trigger-based uplink multi-user operations, leading to delayed data transmission.
Innovation Solution
The implementation of an Ultra-High Reliability (UHR) Operating Mode Control subfield allows wireless devices to selectively exclude specific access categories (ACs) or traffic identifiers (TIDs) from uplink multi-user operations, enabling the use of enhanced distributed channel access (EDCA) for low latency data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If trigger-based uplink multi-user mode is used for data transmission, then network efficiency and throughput are improved, but latency increases for specific access categories or traffic identifiers that are suspended from this mode
Solution Approach 1:
The patent segments the uplink transmission mode by access category or traffic identifier. Some ACs/TIDs operate in trigger-based uplink multi-user mode while others operate in enhanced distributed channel access mode, allowing different latency characteristics for different traffic types simultaneously
Solution Approach 2:
The patent dynamically selects the transmission mode (trigger-based multi-user or enhanced distributed channel access) based on the access category or traffic identifier of the data being transmitted, enabling adaptive optimization for different traffic requirements
2Productivity
If all access categories are included in uplink multi-user mode, then channel utilization is maximized, but low latency applications experience delayed transmission due to timer constraints
Solution Approach 1:
The patent applies different transmission mode qualities to different access categories or traffic identifiers. High-latency-tolerant ACs/TIDs use trigger-based multi-user mode for efficient channel utilization, while low-latency ACs/TIDs use enhanced distributed channel access mode for reliable timely transmission
3Loss of time
If trigger-based uplink multi-user mode is suspended for specific ACs or TIDs, then low latency transmission is enabled, but overall network throughput decreases due to reduced multi-user operation participation
Solution Approach 1:
The patent segments the AC/TID space into multiple groups with different transmission mode assignments, allowing simultaneous operation of both trigger-based multi-user mode (for throughput) and enhanced distributed channel access mode (for low latency) within the same network
Solution Approach 2:
The patent makes the system universally capable of supporting both trigger-based uplink multi-user mode and enhanced distributed channel access mode, allowing the network to flexibly assign appropriate modes based on traffic requirements rather than being constrained to a single mode
Data Source
AI summary
A method performed by a wireless device operating in an uplink multi-user mode includes: setting an exclusion bit in an operating mode control subfield of a transmit operating mode indicator frame, the exclusion bit indicating an exclusion of an AC or a TID from the uplink multi-user mode; sending, to the AP, a trigger-based physical layer protocol data unit (PPDU) comprising the transmit operating mode indicator frame; contending for channel access using an enhanced distributed channel access (EDCA) function to send the low latency data via an uplink; and transmitting the low latency data to the AP in a single user PPDU in accordance with EDCA-based channel contention.