Beacon TWT Scheduling for Low-Latency Multi-Link WLAN Frames
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Solution Overview
Problem
Existing wireless LAN systems face challenges in efficiently performing multi-link operations for low latency frame transmission and reception, particularly when simultaneous transmission or reception is not possible.
Innovation Solution
A multi-link device (MLD) with a communication module and processor that controls frame transmission and reception using a beacon frame with a request type field for target wake time (TWT) to configure a broadcast TWT service period for low latency operations, including quiet information elements to protect intervals and notify stations about restricted transmission times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-link operations are performed without restricted transmission intervals, then device complexity is reduced, but low latency frame transmission reliability deteriorates
Solution Approach 1:
The patent applies preliminary action by establishing quiet information elements and target wake time (TWT) service period configurations before low latency frame transmissions occur. These pre-configured restricted transmission intervals prepare the system in advance to ensure reliable low latency transmissions by preventing other devices from accessing the channel during critical transmission periods, thus resolving the contradiction between reliability and complexity.
2Loss of time
If restricted transmission intervals are implemented for low latency operations, then low latency frame transmission is ensured, but channel utilization efficiency deteriorates
Solution Approach 1:
The patent implements periodic action through TWT service periods that create structured intervals for low latency transmissions. By periodically designating specific time windows as restricted transmission intervals rather than continuously blocking the channel, the system ensures low latency frame transmissions while allowing channel access during non-restricted periods, thus balancing transmission time requirements with channel utilization efficiency.
3Reliability
If simultaneous transmission and reception are disabled during multi-link operations, then transmission errors are reduced, but communication speed deteriorates
Solution Approach 1:
The patent applies segmentation by dividing communication operations into distinct transmission intervals and reception intervals within the multi-link framework. By segmenting the time domain into restricted and non-restricted periods, the system prevents simultaneous transmission and reception that cause interference while maintaining efficient communication throughput through parallel operations in different time segments, thus resolving the contradiction between error rate and communication speed.
Data Source
AI summary
Disclosed is a method for transmitting a frame of a wireless communication system. A non-AP STA receives a beacon frame comprising a request type field from an AP and can receive a downlink frame or transmit an uplink frame in accordance with a specific field value included in the beacon frame. Here, the request type field comprises a specific field for indicating a target wake time (TWT) for a low latency operation, and, if the value of the specific field is set as a first specific value, a broadcast TWT service period (SP) is a TWT SP for the low latency operation.