PDMA Uplink Power Allocation via Location-Based Pairing

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Solution Overview

Problem

The integration of Pattern Division Multiple Access (PDMA) technology with uplink power control in 5G systems leads to increased Interference Over Thermal (ITO), affecting power consumption, the number of users accessing the cell, and spectral efficiency, particularly for edge users.

Innovation Solution

An uplink power allocation method that determines users to be paired based on location, allocates different PDMA pattern vector groups, and calculates power control factors to optimize transmission power, using a power control pattern matrix to maximize Proportional Fair weighted sum throughput while minimizing power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If LTE uplink power control technology is used in PDMA systems, then forward compatibility is ensured, but Interference Over Thermal (ITO) increases significantly

Engineering Contradiction:

Improveforward compatibilityVSAvoidInterference Over Thermal (ITO)

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent modifies the power control parameters by introducing a path loss compensation factor α(j) that adjusts the uplink transmission power based on the user's location and channel conditions. This changes the power allocation strategy from standard LTE to a PDMA-optimized version that reduces ITO while maintaining compatibility

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent segments the cell into different regions (edge users vs. center users) and applies different power control strategies for each segment. Edge users receive higher path loss compensation to ensure coverage, while center users use lower power to reduce interference, thereby resolving the ITO issue while maintaining forward compatibility

Inventive Principle:

Principle #1Segmentation

2Reliability

If path loss compensation is introduced to prevent overlarge uplink transmission power, then edge user coverage is improved, but system ITO increases

Engineering Contradiction:

Improveedge user coverageVSAvoidsystem ITO

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by using different path loss compensation factors for different users based on their location. Edge users receive higher compensation (higher α(j)) to ensure reliable coverage, while center users receive lower compensation to minimize their contribution to system ITO. This localized differentiation resolves the contradiction between coverage and interference

Inventive Principle:

Principle #3Local quality

3Productivity

If multiple users transmit on same time-frequency resources in PDMA, then spectral efficiency increases, but power consumption increases

Engineering Contradiction:

Improvespectral efficiencyVSAvoidterminal power consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent implements dynamic power allocation where each user's transmission power is adjusted in real-time based on channel conditions, path loss, and interference levels. The power control formula dynamically computes optimal power levels that maintain spectral efficiency while adapting to changing conditions to minimize power consumption

Inventive Principle:

Principle #15Dynamics

4Productivity

If uplink transmission power is increased to improve spectral efficiency, then cell average spectral efficiency increases, but terminal power consumption increases

Engineering Contradiction:

Improvecell average spectral efficiencyVSAvoidterminal power consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent incorporates feedback mechanisms where the base station monitors uplink reception quality and sends power control commands to adjust terminal transmission power. This closed-loop feedback ensures spectral efficiency is maintained while preventing excessive power consumption by continuously optimizing power levels based on actual system conditions

Inventive Principle:

Principle #23Feedback

Data Source

PatentEP3324685B1Uplink power allocation method, device and system

Publication Date: 2021.03.03 CHINA ACAD OF TELECOMM TECH

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AI summary

An uplink power allocation method, an uplink power allocation device and an uplink power allocation system are provided. The uplink power allocation method includes: determining users to be paired, based on locations of the users within the cell; determining Patten Division Multiple Access (PDMA) pattern matrixes, allocating different PDMA pattern vector groups for the users respectively, and obtaining a power control pattern matrix based on the PDMA pattern vector groups; and determining power control factors of the users in each pair based on the power control pattern matrix, and determining an uplink transmission power of each user based on the power control factors.