Wireless Device Access Channel Power Control
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Solution Overview
Problem
In wireless multiple-access communication networks, the conservative controls for access channel transmission lead to inefficient use of system resources, resulting in excessive output power usage and resource waste due to all devices transmitting at the same level regardless of varying channel conditions.
Innovation Solution
Wireless devices store historical information from previous access attempts and use it to adjust their output power based on current RF conditions, determining a power value that balances performance and power consumption, thereby reducing the average output power required for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conservative controls are imposed on all wireless devices for access channel transmission, then network access reliability is improved, but system resource efficiency deteriorates due to excessive power usage
Solution Approach 1:
The patent applies local quality by allowing each wireless device to independently adjust its transmit power based on its specific channel conditions and historical access performance, rather than imposing uniform conservative controls on all devices. Devices with good channel conditions and successful access history use lower power, while those with poor conditions maintain higher power for reliability.
Solution Approach 2:
The patent implements dynamics by enabling wireless devices to dynamically adjust their transmit power levels based on real-time RF conditions and historical access attempt outcomes. The power control adapts continuously as channel conditions change, transitioning from static conservative controls to adaptive power management that optimizes the balance between reliability and energy efficiency.
2Reliability
If all wireless devices transmit on the access channel based on conservative controls, then access success rate is maintained, but system resource waste increases
Solution Approach 1:
The patent employs feedback mechanisms where wireless devices monitor their own access attempt outcomes and RF conditions, then use this information to adjust future transmit power levels. The system feeds back historical access performance data to each device, enabling them to learn from past attempts and optimize power usage while maintaining access success rates.
Solution Approach 2:
The patent changes the power parameter dynamically based on observed RF conditions and access performance history. Instead of using a fixed conservative power level, the system adjusts the transmit power parameter according to actual channel quality and previous access outcomes, reducing power when conditions are good and maintaining higher power when needed for reliability.
3Ease of operation
If wireless devices use fixed power levels for access channel transmission, then implementation simplicity is maintained, but adaptability to varying channel conditions deteriorates
Solution Approach 1:
The patent implements self-service by enabling wireless devices to autonomously determine and adjust their own transmit power levels based on their observed RF conditions and historical access performance. Each device independently makes power control decisions without requiring complex centralized control, simplifying network-side implementation while achieving adaptive power management.
Data Source
AI summary
A wireless device stores historical information for a prior access attempt and uses this information to lower the output transmit power for a current access attempt on an access channel. The historical information may include RF conditions for the prior access attempt, the performance for the prior access attempt, and a power value used for the prior access attempt. The power value may be a power adjustment or an initial power level. For the current access attempt, the wireless device obtains the historical information, determines the current RF conditions, and determines a power value for this access attempt based on the current RF conditions and the historical information. The wireless device determines the output power for each access probe based on the power value and other applicable parameters and sends each access probe at the determined output power. The wireless device updates the historical information upon completing the access attempt.