Uplink Power Control via Dynamic Channel Priority
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Solution Overview
Problem
In LTE-A systems, the transmit power of user equipment (UE) often exceeds the maximum transmit power or reaches interference levels when multiple uplink channels, including PRACH in a secondary cell, are transmitted simultaneously in the same sub-frame, leading to power and interference limitations.
Innovation Solution
A method and apparatus for power control that compares transmission parameters with preset thresholds to determine channel priorities, allowing for dynamic control of transmit power across multiple uplink channels, ensuring the PRACH is properly ranked and powered to avoid exceeding maximum transmit power or causing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple uplink channels including PRACH are transmitted simultaneously in the same sub-frame, then the system capacity and data rate are improved, but the transmit power exceeds the maximum transmit power of the UE
Solution Approach 1:
The patent implements dynamic power control by adjusting the transmit power of different uplink channels based on their priorities and the current power situation. The base station dynamically determines power allocation for PUCCH, PUSCH, SRS, and PRACH channels to ensure that the total transmit power does not exceed the maximum power limit while maintaining system capacity.
Solution Approach 2:
The patent changes the power parameters of different uplink channels dynamically. By adjusting power ratios, power offsets, and priority levels of various channels based on channel conditions and system requirements, the system optimizes power distribution to prevent exceeding maximum transmit power while maintaining high productivity.
2Productivity
If multiple uplink channels including PRACH are transmitted simultaneously in the same sub-frame, then the data rate is improved, but the transmit power reaches the interference level
Solution Approach 1:
The patent applies different power control strategies to different local channels (PUCCH, PUSCH, SRS, PRACH) based on their specific requirements and priorities. Each channel receives appropriate power allocation tailored to its function, ensuring that critical channels maintain sufficient power while less critical channels use power efficiently to minimize interference.
Solution Approach 2:
The patent implements feedback mechanisms where the base station monitors the power usage and interference levels of different uplink channels, then adjusts power allocation accordingly. This closed-loop control ensures that transmit power remains within acceptable interference levels while maintaining high data rates.
3Device complexity
If fixed priority rules are used for power allocation among channels, then the power control is simple, but the system cannot adapt to different transmission scenarios
Solution Approach 1:
The patent transforms the static power control system into a dynamic one by introducing adjustable priority levels and power ratios for different channels. The base station can dynamically modify channel priorities and power allocations based on varying transmission scenarios, channel conditions, and system requirements, providing both simplicity and adaptability.
Solution Approach 2:
The patent creates a universal power control framework that can handle multiple transmission scenarios (different channel combinations, different power conditions, different interference levels) through a unified set of adjustable parameters. This multi-functional approach allows the same power control mechanism to adapt to various situations without requiring separate fixed rules for each scenario.
Data Source
AI summary
A sending parameter of a preamble is compared with at least one preset parameter threshold to obtain a comparison result. A channel priority is determined in accordance with the comparison result. When a plurality of uplink channels are required for simultaneous transmission, the transmitting powers of the plurality of uplink channels is determined in accordance with the channel priority; and the plurality of uplink channels comprising a PRACH. This scheme adopts an unfixed strategy for the ranking of the PRACH in the channel priority, and determines the ranking of the PRACH in the channel priority by comparing the sending parameter of the preamble with a preset parameter threshold or receiving a signaling from a base station.