Restrictive TWT Service Period Scheduling for Frame Collision Avoidance
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Solution Overview
Problem
In wireless communication systems, particularly in IEEE 802.11ax networks, the scheduling of trigger frames close to the end of a Target Wake Time (TWT) Service Period (SP) can lead to collisions between uplink frames due to incorrect network allocation vectors (NAV) reset by user devices, resulting in inefficient resource utilization and potential data loss.
Innovation Solution
Implementing a restrictive TWT SP system that prohibits scheduling trigger frames close to the end of the TWT SP and sets the cascade indication field based on remaining duration and acknowledgment policies to ensure sufficient time for frame transmission and acknowledgment within the allocated period, thereby minimizing collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If trigger frames are scheduled close to the end of TWT Service Period, then resource utilization efficiency is improved, but frame transmission collisions occur due to incorrect NAV reset
Solution Approach 1:
The patent applies preliminary action by calculating and determining whether sufficient time remains in the TWT Service Period before scheduling trigger frames. The AP performs this check in advance to ensure that trigger frames scheduled near the end of the TWT SP have enough time for complete transmission and acknowledgment, preventing collisions caused by premature NAV reset by user devices.
2Adaptability or versatility
If cascade indication field is always set to enable additional trigger frames, then scheduling flexibility is improved, but transmission time insufficiency occurs leading to collisions
Solution Approach 1:
The patent applies dynamics by making the cascade indication field value dynamic rather than static. The AP adjusts the cascade indication field based on the remaining duration of the TWT Service Period and the acknowledgment policy. When sufficient time remains, the cascade indication is set to enable additional trigger frames; when time is insufficient, it is set to prevent scheduling, thus adapting to varying time conditions to avoid collisions.
3Productivity
If user devices reset NAV at the beginning of TWT SP, then channel access efficiency is improved, but collisions occur with uplink frames transmitted near the end of TWT SP
Solution Approach 1:
The patent applies feedback by implementing a check mechanism that monitors the remaining duration of the TWT Service Period before scheduling trigger frames. This feedback loop ensures that the AP only schedules trigger frames when there is sufficient time for complete transmission and acknowledgment, preventing the harmful effect of collisions between uplink frames and NAV reset operations while maintaining channel access efficiency.
Data Source
AI summary
This disclosure describes systems, methods, and apparatus related to a restrictive target wake time (TWT) service period (SP) system. A device may determine a beacon frame to be sent to one or more power save devices. The device may determine a time duration of a TWT SP associated with the one or more power save devices. The device may determine a first trigger frame including a cascade indication. The device may determine a first time associated with the first trigger frame. The device may cause to send the trigger frame to the one or more power save devices based at least in part on a remaining duration of the TWT SP.