Path Loss Adjustment Factor for Uplink Power Control
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Solution Overview
Problem
Current path loss calculation methods in DAS systems are inaccurate for uplink power control as they only support single power transmission points, failing to account for multiple power transmission points, leading to inconsistent downlink and uplink receiving points and reduced accuracy in UE transmit power calculation.
Innovation Solution
A method where a base station calculates a path loss adjustment factor using power parameters from multiple power transmission points, including macro sites and RRHs, and sends this factor to the UE to accurately calculate uplink transmit power, enabling flexible participation of macro sites and RRHs in coordinated reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If path loss calculation uses single power transmission point method, then device complexity is reduced, but measurement precision of path loss compensation deteriorates
Solution Approach 1:
The patent segments the path loss compensation process by introducing a path loss adjustment factor that separates the basic path loss calculation from the multi-point coordination adjustment. This allows the system to maintain simple single-point calculation methodology while adding correction terms to account for multiple power transmission points, thus resolving the contradiction between simplicity and accuracy.
Solution Approach 2:
The patent changes the parameter representation by introducing an adjustment factor that modifies the traditional path loss value. Instead of completely redesigning the path loss calculation to handle multiple points, the system adjusts the existing path loss parameter with an additional factor that captures the effects of multiple power transmission points, maintaining computational simplicity while improving accuracy.
2Measurement precision
If path loss calculation considers multiple power transmission points, then measurement precision of path loss compensation is improved, but device complexity increases
Solution Approach 1:
The patent introduces a path loss adjustment factor as an intermediary element that mediates between the simple single-point path loss calculation and the complex multi-point reality. This adjustment factor serves as a bridge, capturing the effects of multiple power transmission points without requiring the system to directly compute complex multi-point path losses, thus improving accuracy while controlling complexity.
Solution Approach 2:
The system performs preliminary calculation of the path loss adjustment factor based on downlink path loss measurements, and then applies this pre-computed factor to uplink power control. This preliminary action allows the system to prepare the correction terms in advance, avoiding complex real-time calculations during uplink transmission and reducing overall system complexity.
3Ease of operation
If downlink and uplink use same path loss calculation method, then ease of operation is improved, but measurement precision deteriorates due to inconsistent receiving points
Solution Approach 1:
The patent applies local quality by making the path loss compensation locally adapted to the specific transmission point configuration. The path loss adjustment factor is calculated based on the actual downlink receiving conditions at each UE, allowing each user to have a customized adjustment that accounts for their specific geometric relationship with multiple power transmission points, thus improving accuracy while maintaining uniform operation procedures.
Data Source
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AI summary
Embodiments of the present invention disclose a path loss compensation method, a base station, and a user equipment to implement calculation for path loss compensation where there are multiple power transmission points, which support a macro site and an RRH that flexibly participate in uplink coordinated reception, and improve accuracy of the UE in calculating an uplink transmit power. The method in an embodiment of the present invention includes: obtaining, by a base station, power parameters of a macro site and an RRH in a cell where a UE is located; calculating, by the base station, a path loss adjustment factor for the UE according to the power parameters, where the path loss adjustment factor is an adjustment parameter used by the base station to compensate for an uplink transmit power of the UE; and sending, by the base station, the path loss adjustment factor to the UE, so that the UE can calculate the uplink transmit power according to the path loss adjustment factor.