LTE Uplink Power Control Threshold Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In LTE systems, the uplink power control algorithm can result in over-power or under-power conditions due to dynamic changes in bandwidth and modulation/coding schemes, leading to inefficient power usage and interference, especially when power thresholds are reached.
Innovation Solution
Decoupling the power calculation algorithm from dynamic changes in PUSCH bandwidth and modulation/coding schemes by using fixed or semi-persistent values for maximum and minimum power thresholds, and resetting the power control command when these thresholds are reached, to maintain optimal transmit power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If accumulative power control is used to adapt to channel conditions, then power control responsiveness is improved, but power saturation occurs when maximum/minimum thresholds are reached
Solution Approach 1:
The patent implements dynamic power control by allowing the accumulative power control algorithm to continuously adjust transmit power based on channel conditions until thresholds are reached. When maximum or minimum power thresholds are reached, the system dynamically switches to using the scheduled PUSCH transmission parameters (bandwidth and modulation/coding scheme) to determine power levels, ensuring both responsiveness and accuracy are maintained under different operating conditions.
2Productivity
If bandwidth and modulation/coding scheme are increased to improve data rate, then quality of service is improved, but over-power conditions occur
Solution Approach 1:
The patent changes the parameters used for power calculation based on operating conditions. When maximum or minimum power thresholds are reached, the system switches from using accumulative power control adjustments to using the scheduled PUSCH transmission parameters (bandwidth and modulation/coding scheme) directly in power calculation. This parameter switching ensures that power levels remain appropriate even when data rate requirements increase through bandwidth or modulation changes.
3Use of energy by moving object
If bandwidth and modulation/coding scheme are decreased to reduce power consumption, then energy efficiency is improved, but under-power conditions occur
Solution Approach 1:
The patent implements parameter switching based on power threshold conditions. When maximum or minimum power thresholds are reached, the system uses the scheduled PUSCH transmission parameters (bandwidth and modulation/coding scheme) to determine appropriate power levels. This ensures that even when bandwidth or modulation scheme is decreased for energy efficiency, the power control mechanism can compensate to prevent under-power conditions and maintain quality of service.
Data Source
AI summary
Methods and apparatus in a wireless communication system are described for receiving and processing transmit power control commands, where, for example, the response to the transmit power control commands is conditionally decoupled from at least one of a transmit bandwidth parameter, a transport format parameter and a power stepsize limit. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the disclosed subject matter. Therefore, it is to be understood that it should not be used to interpret or limit the scope or the meaning of the claims.