Wireless Device Fast Fading Power Restriction
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Solution Overview
Problem
Conventional power control methods in wireless networks lead to significant inter-cell interference during fast fading events, as wireless devices increase transmit power to compensate for path loss, which can exceed 30 dB, straining neighboring cells and inefficiently utilizing resources.
Innovation Solution
A modified link adaptation process at wireless devices, which calculates an average transmit power and compares it to the slot transmit power, adjusts transmission parameters to limit the increase in transmit power during fast fading events, reducing interference by either adjusting data rate or transmit power on the Enhanced Data Packet Data Channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless device increases transmit power to compensate for fast fading, then the signal level at the serving base station is maintained, but significant inter-cell interference is caused to neighboring cells
Solution Approach 1:
The patent applies dynamics by making the transmit power adjustment adaptive rather than static. The wireless device dynamically adjusts its transmit power based on real-time channel conditions and historical power patterns, allowing it to compensate for fast fading while avoiding excessive power increases that would cause interference to neighboring cells.
Solution Approach 2:
The patent implements preliminary action by calculating historical average transmit power and comparing it with current slot transmit power before making power adjustments. This preliminary comparison allows the device to anticipate and prevent excessive power increases that would cause harmful inter-cell interference, while still maintaining adequate signal level for fast fading compensation.
2Reliability
If the wireless device increases transmit power to compensate for fast fading, then transmission errors are reduced, but resource utilization efficiency deteriorates due to excessive power consumption
Solution Approach 1:
The patent applies parameter changes by modifying the transmit power parameter based on the comparison between historical average power and current slot power. When the slot power exceeds the historical average by a certain threshold, the device adjusts the power increase parameter to be more conservative, thereby reducing unnecessary energy consumption while maintaining adequate transmission reliability.
Solution Approach 2:
The patent implements feedback by continuously monitoring and comparing the current slot transmit power against the historical average transmit power. This feedback mechanism allows the wireless device to learn from past power usage patterns and adjust future power settings to optimize the balance between transmission reliability and energy efficiency.
Data Source
AI summary
The present application discloses methods and apparatus for modifying a normal link adaptation process of a wireless device (200). The normal link adaptation process may be used to compensate for a fast fading dip detected by a base station (100). The present application teaches that the normal fast fading compensation may cause inter-cell interference and degrade system performance. The present application discloses imposing a fast fading restriction or limitation on the normal fast fading compensation can reduce inter-cell interference, improve system capacity, and extends the battery life of the wireless device.