Uplink Power Allocation in CoMP Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently allocating resources for coordinated multipoint (CoMP) transmissions, particularly in calculating path loss parameters for multiple reception points, which affects uplink power allocation and interference reduction.
Innovation Solution
A method and user equipment configuration that obtain and calculate multiple path loss parameters using reference signal transmit powers received from radio resource control (RRC) signaling, enabling accurate uplink power allocation and improved resource utilization by measuring received powers of cell-specific and channel state information reference signals from multiple antenna ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple path loss parameters are calculated for CoMP reception points, then uplink power allocation precision is improved, but device complexity increases
Solution Approach 1:
The patent divides the path loss calculation into separate segments for each CoMP reception point. Instead of calculating a single aggregate path loss, the system calculates individual path loss parameters (PL1, PL2, etc.) for each reception point based on their respective reference signal received powers. This segmentation enables precise power allocation per reception point while managing complexity through modular calculation steps.
Solution Approach 2:
The patent performs preliminary measurements of reference signal received powers (RSRPs) from multiple reception points before the actual uplink transmission power allocation. By pre-calculating and storing path loss parameters for each reception point based on downlink reference signals, the system prepares necessary parameters in advance, reducing real-time computational complexity during uplink power allocation.
2Measurement precision
If reference signal transmit powers are obtained from RRC signaling, then measurement precision is improved, but information transmission overhead increases
Solution Approach 1:
The patent utilizes the existing RRC signaling mechanism, which is already employed for other configuration purposes in LTE systems, to convey reference signal transmit power information. By making the RRC signaling multi-functional (serving both general configuration and specific power indication purposes), the patent avoids creating dedicated signaling channels, thereby minimizing additional overhead while achieving precise power measurements.
3Reliability
If uplink power allocation is optimized for multiple reception points, then communication quality is improved, but system complexity increases
Solution Approach 1:
The patent applies local quality optimization by calculating and allocating uplink transmission power specifically tailored to each CoMP reception point's channel conditions. Instead of using a uniform power allocation strategy, the system determines reception-point-specific path loss parameters and adjusts transmit power accordingly for each reception point, thereby improving overall communication quality while managing complexity through localized optimization.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A method for obtaining multiple path loss parameters by a mobile station is described. A radio resource control (RRC) signaling message is received from a base station. A first transmit power corresponding to a first reference signal is obtained from the RRC signaling message. A second transmit power corresponding to a second reference signal is obtained from the RRC signaling message. A first path loss parameter is calculated using the first transmit power. A second path loss parameter is calculated using the second transmit power.