Multi-Link WLAN Scheduling Around R-TWT Service Periods
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Solution Overview
Problem
In dense wireless LAN environments, devices operating with restricted target wake time (R-TWT) face challenges in maintaining low-latency communication due to non-simultaneous transmit and receive (NSTR) or enhanced multi-link single radio (EMLSR) operations, where communication on one link interferes with the configured R-TWT service period on another link.
Innovation Solution
The method involves identifying the service period on a second link and performing communication on a first link before its start time, ensuring that the communication ends before the R-TWT service period begins, and in some cases, releasing a medium synchronization delay timer to prevent interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If communication is performed on the first link during R-TWT service period on the second link, then device utilization is improved, but low-latency communication performance deteriorates due to interference
Solution Approach 1:
The patent segments the communication operations by separating them into distinct time periods: before the R-TWT service period starts and during the R-TWT service period. By completing data transmission and acknowledgment before the R-TWT period begins, the system allows the device to switch to low-latency mode on the second link without interference, thus maintaining both device utilization and communication performance.
Solution Approach 2:
The patent applies preliminary action by performing all necessary communication operations (data transmission and acknowledgment reception) before the R-TWT service period starts. This ensures that the device is fully prepared to enter the low-latency R-TWT mode without any pending operations that could cause interference or latency.
2Reliability
If communication ends before R-TWT service period start time, then low-latency communication is ensured, but communication efficiency may be reduced
Solution Approach 1:
The system performs communication operations in advance before the R-TWT service period, optimizing the timing to maximize efficiency. By completing transmissions and acknowledgments before the low-latency period starts, the system avoids interruptions while maintaining communication efficiency.
Solution Approach 2:
The patent dynamically adjusts communication timing based on the R-TWT service period schedule. The system monitors the service period start time and coordinates communication operations to end precisely before this time, optimizing both low-latency performance and communication efficiency through adaptive timing.
3Device complexity
If NSTR or EMLSR operations are used, then device complexity is reduced, but communication interference increases between links
Solution Approach 1:
The patent segments communication operations into distinct time periods: before R-TWT service period and during R-TWT service period. By completing data transmission and acknowledgment before the R-TWT period begins, the system allows the device to switch to low-latency mode on the second link without interference, thus maintaining both device utilization and communication performance.
Solution Approach 2:
The patent applies preliminary action by performing all necessary communication operations (data transmission and acknowledgment reception) before the R-TWT service period starts. This ensures that the device is fully prepared to enter the low-latency R-TWT mode without any pending operations that could cause interference or latency.
Data Source
AI summary
A method and apparatus for low latency communication in a wireless LAN supporting multiple links are disclosed. The method of a first device comprises the steps of: identifying an SP that is set in a second link; and communicating with a second device in a first link before the start time of the SP, wherein the communication between the first device and the second device ends before the start time of the SP.