OBSS PD Threshold Adjustment for Low Latency Traffic
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Solution Overview
Problem
Current wireless communication systems lack effective solutions for ensuring low latency traffic reliability, particularly when channels are busy due to overlapping basic service set (OBSS) transmissions, leading to interference and reduced network efficiency.
Innovation Solution
The enhanced low latency system allows devices with urgent low latency traffic to use an aggressive OBSS_PD spatial reuse mechanism by defining a more aggressive OBSS_PD threshold and incorporating a non-SRGB mode, enabling transmissions even when the channel is occupied, while ensuring sensitive traffic is protected through specific signaling and classification procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If devices wait for channel to be free before transmitting low latency traffic, then channel access reliability is maintained, but transmission delay increases
Solution Approach 1:
The patent changes the CCA threshold parameter from a fixed value to a dynamic value that can be adjusted based on traffic type. For low latency traffic, a higher (more aggressive) threshold is used, allowing transmission during ongoing OBSS transmissions. This parameter change enables the system to prioritize time-critical traffic while maintaining standard reliability for other traffic types.
Solution Approach 2:
The patent introduces dynamic behavior by allowing the CCA threshold to be adjusted in real-time based on the urgency of the traffic. The system transitions from a static channel access mechanism to a dynamic one where the threshold adapts to traffic requirements, enabling low latency traffic to preempt ongoing transmissions when necessary.
2Speed
If devices use aggressive OBSS_PD threshold to access channel during OBSS transmissions, then transmission speed increases, but interference to ongoing transmissions increases
Solution Approach 1:
The patent applies different CCA thresholds to different traffic types and spatial locations. Low latency traffic gets a higher threshold allowing aggressive access, while other traffic maintains the standard threshold. This local differentiation of access parameters allows the system to optimize for specific traffic requirements without causing widespread interference.
Solution Approach 2:
The patent converts the potentially harmful effect of channel occupancy by OBSS transmissions into a benefit by allowing low latency traffic to utilize the same channel. Instead of treating ongoing transmissions as blocking conditions to avoid, the system leverages them as opportunities for parallel low latency transmissions, turning the harm of channel occupation into beneficial spectrum utilization.
3Stability of the object's composition
If standard CCA threshold is used for all traffic types, then network stability is maintained, but low latency traffic reliability deteriorates
Solution Approach 1:
The patent segments the network traffic into different categories (low latency and non-low latency) and applies different CCA thresholds to each segment. This segmentation allows the system to maintain standard network stability for the majority of traffic while providing enhanced reliability for the critical low latency segment through aggressive threshold adjustment.
Solution Approach 2:
The patent changes the CCA threshold parameter based on traffic classification. The system maintains the standard threshold for general traffic to preserve network stability, while dynamically adjusting to a higher threshold for low latency traffic to ensure timely delivery, thus resolving the contradiction between stability and latency-critical reliability.
Data Source
AI summary
This disclosure describes systems, methods, and devices related to enhanced low latency. A device may generate a medium access control protocol data unit (MPDU) associated with low latency traffic based on a predefined criteria. The device may utilize an overlapping basic service set preamble detection (OBSS_PD) threshold for the low latency traffic. The device may transmit the MPDU during an ongoing OBSS PPDU transmission using an OBSS_PD spatial reuse mechanism. The device may include an indication in a preamble of the MPDU that spatial reuse is not allowed with the MPDU by another STA.