Downlink Resource Allocation Modulation Alphabets Throughput

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Classical resource allocation methods for downlink OFDMA systems are not well adapted to advanced communication scenarios with increased degrees of freedom and stricter feedback requirements, particularly in future wireless communication networks.

Innovation Solution

A method for resource allocation in wireless communication networks that involves obtaining channel feedback information for each modulation alphabet and resource unit, allowing simultaneous transmission on multiple channels with different modulation alphabets, and selecting assignments that maximize total downlink throughput by optimizing the allocation of wireless communication devices to resource units and modulation alphabets.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If classical resource allocation methods are used for downlink OFDMA, then implementation is simple, but they are not adapted to advanced communication scenarios with increased degrees of freedom

Engineering Contradiction:

Improveadaptability to advanced communication scenariosVSAvoidcomplexity of resource allocation method

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments the resource allocation process into distinct phases: channel feedback information collection, modulation alphabet selection, and resource unit assignment. This segmentation allows the system to handle complex multi-dimensional optimization by breaking it down into manageable steps, enabling adaptation to advanced scenarios while maintaining implementation feasibility

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces dynamic modulation alphabet selection where the modulation scheme is not fixed but adapts based on channel conditions and device capabilities. The system dynamically chooses from multiple modulation alphabets (e.g., QPSK, 16-QAM, 64-QAM) to optimize throughput, making the resource allocation method adaptable to varying communication scenarios

Inventive Principle:

Principle #15Dynamics

2Productivity

If multiple modulation alphabets are supported for simultaneous transmission, then downlink throughput increases, but feedback overhead increases

Engineering Contradiction:

Improvedownlink throughputVSAvoidfeedback overhead

Core Design Contradiction:

ProductivityVSLoss of information

Solution Approach 1:

The patent extracts only the essential feedback information needed for resource allocation - specifically, channel quality indicators and supported modulation alphabets from each device. By taking out only this critical subset of information rather than complete channel state information, the system enables multi-modulation transmission while keeping feedback overhead manageable

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent designs a universal feedback mechanism that serves multiple purposes: it identifies supported modulation alphabets, assesses channel quality, and enables the network to make informed resource allocation decisions. This multi-functional feedback approach reduces overall overhead by combining multiple information needs into a single feedback exchange

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Productivity

If resource allocation optimizes for highest total downlink throughput, then system efficiency improves, but computational complexity increases

Engineering Contradiction:

Improvetotal downlink throughputVSAvoidcomputational complexity of allocation selection

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies local quality optimization by evaluating resource allocation decisions at the level of individual resource units and device-modulation combinations. Rather than performing exhaustive global optimization, the system makes locally optimal assignments based on channel feedback, achieving high throughput while reducing computational complexity through greedy or heuristic selection methods

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS10506582B2Resource allocation for downlink transmission to at least two wireless communication devices

Publication Date: 2019.12.10 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

There is provided a method for resource allocation for downlink transmission to at least two wireless communication devices in a wireless communication network. Simultaneous transmission to the wireless communication devices is allowed on one or more channels with at least two supported modulation alphabets of different sizes, each channel being defined by a set, called resource unit, of one or more subcarriers. The method comprises obtaining (S1), for each of the wireless communication devices, channel feedback information for each modulation alphabet the wireless communication device supports and for each resource unit on which the wireless communication device is allowed to receive a transmission. The method also comprises selecting (S2), from a number of possible assignments of the wireless communication devices to different resource units and different modulation alphabets, a resource allocation based on the channel feedback information including an assignment of the wireless communication devices to at least one resource unit and at least one modulation alphabet among those assignments providing the highest total downlink throughput for the wireless communication devices.