UE Power Control Reset Under Poor Channel Conditions
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Solution Overview
Problem
In wireless communication systems, there is a conflict between power control mechanisms and antenna transmit diversity mechanisms, leading to potential uplink failures due to deep degradation of reference signal receive power, causing the UE to maintain transmit power on poor antennas and resulting in insufficient power after an ATD antenna switch.
Innovation Solution
Implementing a reset of the TPC power adjustment value after an ATD antenna switch, reducing the ATD hysteresis timer, and scaling the filtering coefficient for pathloss calculations to ensure timely and adequate transmit power adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE maintains transmit power on poor antennas during ATD operation, then the power control mechanism can respond to deep degradation of reference signal receive power, but the transmit power becomes insufficient after an ATD antenna switch causing uplink failures
Solution Approach 1:
The patent applies preliminary action by resetting the TPC power adjustment value to zero before an ATD antenna switch occurs. This preliminary reset ensures that when the antenna switch happens, the power control mechanism starts with a clean baseline, preventing the accumulation of erroneous power adjustments that would otherwise cause insufficient transmit power after the switch. The reset is triggered by detecting a deep degradation in reference signal receive power, which serves as a precursor condition for the upcoming antenna switch.
2Speed
If the ATD hysteresis timer is reduced to enable faster antenna switching, then the system can respond more quickly to channel conditions, but the power control adjustments may not keep up causing power insufficiency
Solution Approach 1:
The patent applies preliminary action by resetting the TPC power adjustment value to zero in advance of the ATD antenna switch, triggered by detecting deep degradation in reference signal receive power. This preliminary reset ensures that when the antenna switch occurs (potentially with reduced hysteresis timer), the power control mechanism starts with a clean baseline, preventing the mismatch between fast antenna switching and slower power control adjustments.
3Stability of the object's composition
If the TPC power adjustment value is not reset after ATD antenna switch, then the power control mechanism maintains continuity, but the pathloss calculation becomes inaccurate leading to uplink failures
Solution Approach 1:
The patent applies preliminary action by resetting the TPC power adjustment value to zero before an ATD antenna switch occurs. This preliminary reset is triggered by detecting a deep degradation in reference signal receive power, which indicates that the current pathloss calculation has become inaccurate due to the poor channel conditions. By resetting beforehand, the system ensures that subsequent pathloss calculations start with an accurate baseline, preventing uplink failures while maintaining overall power control stability.
Data Source
AI summary
Systems and methods for enhanced power control at a user equipment (UE) under poor channel conditions respective to antenna transmit diversity (ATD) mechanisms are discussed herein. In some embodiments, a UE may reset a transmit power control (TPC) power adjustment value when an ATD antenna switch of the ATD mechanism is performed. In some embodiments, a UE may reduce the value of an ATD hysteresis timer upon determining that a reference signal receive power (RSRP) change on a monitored reference signal that drives a pathloss calculation at the UE exceeds a threshold. In some embodiments, a UE may scale a filtering coefficient of a pathloss calculation mechanism upon determining that an RSRP change on a monitored reference signal that drives a pathloss calculation at the UE exceeds a threshold.