UE Scell Power Control via Initial Adjustment
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Solution Overview
Problem
In LTE systems, existing power control methods struggle to accurately manage uplink transmit power for secondary carriers (Scell) when there is a large difference in channel states between primary and secondary carriers, leading to excessive power consumption or signal degradation.
Innovation Solution
A power control method where a UE sets an initial power adjustment value for the Scell based on configuration parameters provided by the base station, allowing for accurate power control even in scenarios with significant channel state differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the initial power adjustment value of the Scell is set to 0 according to the prior art, then the power control method is simple to implement, but the uplink transmit power becomes excessively large or small when there is a large difference in channel states between Pcell and Scell
Solution Approach 1:
The patent applies local quality by setting different initial power adjustment values for different cells based on their specific channel conditions. For Pcell, the initial power adjustment value is set to ΔPrampup+δmsg2, while for Scell it is set to 0. This differentiated approach ensures that each cell's power control is optimized for its local channel characteristics, resolving the contradiction between simplicity and accuracy.
2Reliability
If the uplink transmit power on the Scell is increased to ensure signal quality, then the signal transmission reliability is improved, but the power consumption of the UE increases
Solution Approach 1:
The patent implements feedback-based power control where the eNodeB sends TPC Commands to the UE based on the actual uplink signal quality. The UE adjusts its transmit power according to these feedback commands, allowing the system to dynamically optimize the balance between signal quality and power consumption rather than using a fixed high power setting.
Solution Approach 2:
The patent changes the power control parameters by introducing cell-specific initial power adjustment values (fc(0) for Pcell and gc(0) for Scell) and allowing dynamic adjustment through TPC Commands. This enables the system to adapt power levels to actual channel conditions, improving signal quality when needed while reducing power consumption when conditions are favorable.
3Use of energy by moving object
If the uplink transmit power on the Scell is decreased to reduce power consumption, then the power consumption of the UE is reduced, but the signal cannot be accurately parsed by the eNodeB resulting in data transmission delay
Solution Approach 1:
The feedback mechanism through TPC Commands ensures that the eNodeB can request power increases when signal quality degrades, preventing transmission delays. The real-time feedback loop allows the system to respond to changing channel conditions and maintain reliable communication while minimizing unnecessary power consumption during good channel conditions.
Data Source
AI summary
A power control method, including obtaining, by a UE, configuration information, where the configuration information includes a configuration parameter of at least one secondary carrier (Scell) configured by a base station for the UE; setting, by the UE, an initial power adjustment value of the Scell according to the configuration parameter of the Scell in the configuration information, and controlling, by the UE, transmit power on the Scell according to the set initial power adjustment value of the Scell.