Wireless Preemption Power States for Low-Latency Critical Traffic
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Solution Overview
Problem
Existing wireless networks face challenges in ensuring reliable and timely delivery of time-sensitive network traffic due to contention issues, leading to potential frame loss and increased latency.
Innovation Solution
Implementing a preemption service in wireless networks where devices enter a low transmit power state, allowing authorized devices to transmit preempting traffic at a higher power, thereby ensuring timely delivery of critical frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If devices transmit at high power continuously to ensure reliable delivery, then reliability improves, but energy consumption increases
Solution Approach 1:
The patent implements dynamic transmit power adjustment where devices switch between low power state (for normal traffic) and high power state (for preempting traffic). The access point dynamically controls the preemption state to allow authorized devices to transmit at high power only when necessary, thereby maintaining reliability for critical frames while reducing overall energy consumption compared to continuous high power transmission.
Solution Approach 2:
The patent changes the transmit power parameter dynamically based on traffic type and preemption state. Normal traffic is transmitted at low power, while preempting traffic is transmitted at high power when the preemption state is active. This parameter change allows the system to optimize between reliability and energy consumption by applying high power only when needed for time-sensitive delivery.
2Use of energy by moving object
If devices transmit at low power to save energy, then energy consumption decreases, but transmission reliability deteriorates
Solution Approach 1:
The system dynamically adjusts power levels based on transmission requirements. Most traffic is transmitted at low power to conserve energy, but when preempting traffic needs to be sent, the access point activates the preemption state allowing authorized devices to transmit at high power. This dynamic switching ensures reliability is maintained for critical frames without compromising overall energy savings from low power operation during normal conditions.
Solution Approach 2:
The transmit power parameter is changed based on the preemption state and traffic type. The system operates at low power by default for energy efficiency, then transitions to high power when preempting traffic is identified and the preemption state is activated. This parameter change ensures that reliability is not compromised, as high power is available when needed for time-sensitive frame delivery.
3Loss of time
If preempting traffic transmits at high power over normal traffic, then latency decreases, but interference with other devices increases
Solution Approach 1:
The patent extracts preempting traffic from the normal traffic stream and handles it separately through the preemption mechanism. Authorized devices are identified and granted special permission to transmit preempting traffic at high power when the preemption state is active. This extraction allows critical frames to bypass normal contention and transmission protocols, reducing latency while containing interference to only the affected time window and spatial spectrum.
Solution Approach 2:
The access point performs preliminary identification and authorization of devices that need preemption service before actual transmission occurs. By pre-establishing the preemption state and authorizing specific devices, the system prepares the infrastructure to handle preempting traffic with minimized interference. This preliminary action ensures that high power transmission occurs only when and where necessary, reducing overall interference compared to unrestricted high power transmission.
4Loss of time
If the preemption state is always active to ensure timely delivery, then latency is reduced, but device complexity increases
Solution Approach 1:
The access point performs preliminary identification and authorization of devices that need preemption service before actual transmission occurs. By pre-establishing the preemption state and authorizing specific devices, the system prepares the infrastructure to handle preempting traffic with minimized interference. This preliminary action ensures that high power transmission occurs only when and where necessary, reducing overall interference compared to unrestricted high power transmission.
Solution Approach 2:
The system implements feedback mechanisms where the access point monitors traffic characteristics and preemption state to dynamically control power transmission. Authorized devices receive feedback about the preemption state and adjust their transmission accordingly. This feedback loop simplifies device complexity by centralizing control decisions at the access point while allowing devices to operate with simpler logic, as they only need to follow the preemption state instructions rather than making complex autonomous decisions.
Data Source
AI summary
A preemption service in a wireless network is described. The preemption network increases the reliability of preemption traffic to be quickly delivered over the wireless network. The active preemption service in wireless networks causes the devices in a wireless network to enter a low transmit power state where every device transmits at a power lower than a high or maximum transmission power. Preemption traffic is transmitted from authorized devices at a high or maximum power, over the lower power transmissions, in order to provide an increased guarantee that the preemption traffic will arrive at the intended recipient.