Uplink Power Control Compensation in CoMP Systems
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Solution Overview
Problem
In Coordinated Multi-Point (CoMP) systems, existing uplink power control methods based on path loss are not precise enough due to inconsistencies between data receiving and sending points, leading to reduced quality of uplink data transmission.
Innovation Solution
A compensation method where a base station determines and communicates an adjustment value for uplink power control to User Equipment (UE) using more than 4 bits, with a step size of at least 1dB, to accurately set the uplink sending power, ensuring precise power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing path loss-based power control method is used, then the system is simple to operate, but the uplink power control precision is insufficient in CoMP systems
Solution Approach 1:
The patent introduces a new parameter (adjustment value identified by more than 4 bits) to modify the existing power control mechanism. This adjustment value is used to correct the path loss calculation in CoMP systems, thereby improving power control precision without fundamentally changing the overall system structure
Solution Approach 2:
The patent introduces an intermediary adjustment value that mediates between the base station's path loss calculation and the UE's power control decision. This adjustment value is transmitted from the base station to the UE and serves as a correction factor to achieve precise power control in CoMP scenarios
2Measurement precision
If adjustment value with more than 4 bits is used, then the power control precision is improved, but the signaling overhead increases
Solution Approach 1:
The patent changes the bit length parameter of the adjustment value from the conventional 4 bits to more than 4 bits, enabling finer power control granularity (step size of at least 1dB). This parameter change directly improves power control precision while accepting increased signaling overhead as a necessary trade-off
3Measurement precision
If path loss is calculated based on single point, then the calculation is simple, but it fails to account for CoMP receiving points
Solution Approach 1:
The patent merges the path loss calculations from multiple CoMP receiving points by determining an adjustment value that reflects the combined effect of different receiving points. This adjustment value is then used to correct the overall path loss calculation, accurately representing multi-point reception characteristics
Solution Approach 2:
The patent introduces adjustment values for different path loss scenarios (first adjustment value for first path loss, second adjustment value for second path loss) to account for multiple receiving points. These parameter changes enable the system to handle CoMP-specific path loss variations without complex recalculations
Data Source
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AI summary
Embodiments of the present invention provide a compensation method, a base station, and a user equipment for uplink power control in a CoMP system. The method includes: a base station determines an adjustment value for an uplink sending power of a UE; the base station sends to the UE indication information and the adjustment value for the uplink sending power of the UE, where the indication information is used for indicating a range of the adjustment value for the uplink sending power of the UE, so that the UE, according to the indication information and the adjustment value for the uplink sending power of the UE, determines the uplink sending power of the UE. Embodiments of the present invention are capable of avoiding the problem in the prior art that the uplink power control according to a path loss acquired by the UE is not precise enough because, in a CoMP system, a data receiving point for uplink data transmission might be inconsistent with a data sending point for downlink data transmission, thereby improving the quality of sending uplink data.