Mid Packet Wake Up Protection in OBSS PD Spatial Reuse
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The IEEE 802.11ax standard does not provide guidelines for the length of physical layer protocol data units (PPDUs) during overlapping basic service set (OBSS) packet detect (PD) spatial reuse, leading to increased interference and reduced channel capacity due to mid packet wake up and improper transmission power adjustments.
Innovation Solution
Implementing mechanisms for post-OBSS_PD reduced energy detection (ED) thresholds, delayed carrier sensing, and transmission power reductions to align with OBSS_PD thresholds, as well as duration alignment between OBSS_PD and inter-BSS PPDUs to prevent mid packet wake up and conserve energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power is increased to improve signal strength, then communication reliability is improved, but interference to inter-BSS PPDU increases
Solution Approach 1:
The patent applies local quality by differentiating transmission power levels based on the target BSS. Intra-BSS transmissions use higher power for reliable communication, while inter-BSS transmissions use reduced power to minimize interference. The communication device determines whether a received PPDU is intra-BSS or inter-BSS based on BSS color identification, and adjusts subsequent transmission power accordingly, creating spatially differentiated quality in power transmission.
Solution Approach 2:
The patent implements dynamic transmission power adjustment based on real-time channel conditions and BSS identification. The communication device continuously monitors received PPDUs, identifies their BSS affiliation, and dynamically modifies transmission power for subsequent frames. This dynamic adaptation allows the system to optimize between reliability and interference mitigation depending on the specific transmission context.
2Productivity
If OBSS PD spatial reuse is implemented to increase channel capacity, then spectral efficiency is improved, but mid packet wake up occurs due to lack of guidelines
Solution Approach 1:
The patent applies preliminary action by establishing transmission power reduction rules before inter-BSS transmissions occur. The communication device pre-determines power adjustment strategies based on detected OBSS PPDUs, setting up protective measures in advance to prevent mid-packet wake-up events. This preliminary configuration ensures that subsequent transmissions automatically adhere to interference mitigation guidelines.
Solution Approach 2:
The patent implements parameter changes by modifying transmission power levels as a function of detected OBSS signal characteristics. The communication device adjusts power parameters based on the presence and strength of overlapping BSS signals, creating a continuous adaptation mechanism that balances channel utilization with interference protection. This parameter-based control enables flexible response to varying channel conditions.
3Measurement precision
If energy detection threshold is reduced to detect weaker signals, then detection precision is improved, but false wake up increases
Solution Approach 1:
The patent introduces BSS color identification as an intermediary mechanism between energy detection and wake-up decisions. Instead of directly triggering wake-up based solely on energy threshold crossing, the system first identifies the BSS affiliation of detected signals. This intermediary step filters out false alarms by distinguishing between relevant intra-BSS signals and irrelevant inter-BSS or background noise, allowing more aggressive threshold settings without increasing false wake-ups.
Solution Approach 2:
The patent implements feedback mechanisms where the outcomes of previous transmissions and detections inform future threshold settings and wake-up decisions. The communication device learns from channel conditions and transmission patterns, adjusting detection sensitivity based on historical performance. This feedback loop enables the system to optimize detection precision while maintaining low false wake-up rates through adaptive threshold adjustment.
Data Source
AI summary
Methods and apparatuses for prioritization handling for mid packet wake up protection after OBSS PD spatial reuse are disclosed. A method for wireless communication performed by a communication device comprises transmitting and receiving traffic for an application in an overlapping basic service set preamble detection (OBSS-PD) operation; and reducing a transmission power of the communication device, to reduce adding interference to an inter-basic service set (inter-BSS) physical layer protocol data unit (PPDU) that the communication device is transmitting over, based on energy detection (ED) and in accordance with a channel access procedure or a transmission power reduction procedure.