Multi-AP RTWT Timing Synchronization for Neighbor Channel Contention
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Solution Overview
Problem
In multi-AP communication scenarios, non-AP STAs cannot correctly obtain the start time of a neighboring AP's restricted target wake time service period (RTWT SP), leading to failed channel contention and low-latency service communication issues due to misaligned time synchronization function (TSF) timers.
Innovation Solution
A communication method involving the generation and parsing of frames that include specific time and offset information, allowing non-AP STAs to determine the start time of RTWT SPs of neighboring APs, ensuring timely termination of transmission opportunities (TXOPs) and successful channel contention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If non-AP STA terminates TXOP based on locally stored RTWT information, then simple operation is maintained, but measurement precision of RTWT SP start time deteriorates due to misaligned TSF timers
Solution Approach 1:
The patent introduces a time adjustment mechanism as an intermediary between the non-AP STA's local TSF timer and the neighboring AP's RTWT SP start time. The non-AP STA receives time adjustment information from the access point, which acts as a mediator to synchronize the non-AP STA's timing with the neighboring AP's timing, resolving the measurement precision issue without complicating the overall operation.
Solution Approach 2:
The patent implements a feedback mechanism where the access point provides time adjustment information to the non-AP STA based on the neighboring AP's RTWT SP start time. This feedback loop allows the non-AP STA to continuously adjust its TXOP termination timing to match the actual RTWT SP start time, improving measurement precision while maintaining ease of operation through automated adjustment.
2Ease of manufacture
If multiple APs deploy independently, then ease of deployment is improved, but inter-cell interference increases
Solution Approach 1:
The patent uses feedback mechanisms where non-AP STAs report their associated AP information and time adjustment status back to the access point. This feedback enables the system to coordinate between multiple independently deployed APs, reducing inter-cell interference through centralized time synchronization while preserving the ease of independent AP deployment.
Solution Approach 2:
The patent merges the time synchronization functions of multiple independently deployed APs by having the access point collect time adjustment information from all associated non-AP STAs and coordinate their TXOP termination timings. This combining approach reduces inter-cell interference while maintaining the simplicity of independent AP deployment.
3Device complexity
If non-AP STA uses local TSF timer for TXOP termination, then device complexity is reduced, but reliability of channel contention deteriorates due to time misalignment
Solution Approach 1:
The patent introduces time adjustment information as an intermediary element that bridges the gap between the non-AP STA's simple local TSF timer and the neighboring AP's RTWT SP timing. This intermediary allows the non-AP STA to maintain device complexity at a low level while achieving reliable channel contention through coordinated timing via the time adjustment mechanism.
Solution Approach 2:
The patent applies preliminary action by having the access point pre-calculate and provide time adjustment information to non-AP STAs before channel contention occurs. This preliminary timing coordination ensures that when TXOP termination is executed, the non-AP STA's local TSF timer is already adjusted to align with the neighboring AP's RTWT SP start time, improving channel contention reliability without increasing device complexity.
Data Source
AI summary
A communication method and a related apparatus are provided, relate to the field of communication technologies, and may be applied to a wireless local area network system that supports 802.11 series protocols such as a next-generation Wi-Fi protocol of IEEE 802.11ax, like 802.11be, Wi-Fi 7, or EHT, and a next generation of 802.11be, like Wi-Fi 8, UHR, or Wi-Fi AI. A first AP generates and sends a first communication frame, and a first non-AP STA receives and parses the first communication frame. The first communication frame includes first information and second information, the first information indicates first time information corresponding to the first AP, and the second information indicates an offset between the first time information and start time of an RTWT SP of a second AP. According to the method, the start time of the RTWT SP of the second AP can be determined.