Wireless Frame Preemption for Low-Latency IEEE 802.11 Data
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Solution Overview
Problem
Existing wireless communication technologies struggle to transmit data requiring low latency outside scheduled time periods efficiently, necessitating a different technique beyond R-TWT for prioritized low-latency transmission.
Innovation Solution
A communication device is equipped with a mechanism to preemptively transmit low-latency data by interrupting the transmission of ongoing wireless frames, indicated by a special bit sequence, allowing for prioritized low-latency data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If R-TWT technology is used to transmit data in scheduled time periods, then latency is reduced for steady data transmission, but data requiring low latency outside scheduled time periods cannot be transmitted efficiently
Solution Approach 1:
The patent applies preliminary action by setting up a preemption mechanism in advance where the transmission device monitors for low-latency data arrivals and prepares to interrupt ongoing transmissions. The preamble includes preemption information fields that are prepared beforehand, allowing the system to respond quickly when preemption conditions are met, thus reducing latency for urgent data without disrupting scheduled transmissions.
Solution Approach 2:
The patent implements dynamics by making the transmission schedule flexible rather than fixed. The preemption mechanism allows the transmission device to dynamically adjust the transmission timeline based on real-time conditions, interrupting ongoing transmissions when low-latency data arrives and resuming normal transmission after the preempted data is sent. This dynamic adjustment enables the system to adapt to varying latency requirements.
2Loss of time
If data transmission is interrupted for preemption, then low-latency data can be transmitted prioritarily, but the ongoing data transmission is disrupted
Solution Approach 1:
The patent applies feedback by implementing a preemption notification mechanism where the transmission device sends preemption information back to the receiving device. This feedback loop allows the receiver to understand that transmission was interrupted for preemption purposes and to properly synchronize its reception expectations. The feedback ensures that both devices maintain coordination despite the interruption, preserving reliability.
Solution Approach 2:
The patent uses preliminary action by including preemption information in the preamble before the actual data transmission begins. This advance notification allows the receiving device to prepare for potential preemption, buffering data or adjusting its reception state accordingly. This preliminary preparation reduces the impact of interruptions on overall transmission reliability.
Data Source
AI summary
A communication device capable of performing wireless communication based on an IEEE 802.11 standard transmits a wireless frame having a preamble of a physical layer (PHY) and a data field containing data. If a specific condition is satisfied while the communication device is transmitting first data using one or more wireless frames that include information related to data preemption in the preamble, the communication device interrupts transmission of the first data and preemptively transmits second data different from the first data.