Multipoint Radio Transmission With Periodic Phase Modulation

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Solution Overview

Problem

Future radio communication networks face challenges in supporting a large number of users and high data rates while minimizing interference and maintaining energy efficiency, particularly in dense urban areas, due to the need for coordinated multi-point transmission and reception techniques that require significant data transfer and complex coordination between base stations.

Innovation Solution

The implementation of a method that modulates radio frequency carriers with periodic phase modulation having a period shorter than the symbol period, allowing multiple transmitters to send symbol values in the same symbol period without destructive interference, reducing the need for coordination between base stations and optimizing network capacity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If frequency reuse of 1 is implemented to maximize network efficiency, then network capacity and data rates are improved, but inter-cell interference increases significantly

Engineering Contradiction:

Improvenetwork capacityVSAvoidinter-cell interference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies periodic phase modulation with a period shorter than the symbol period to the transmitted signal. This periodic modulation creates distinct correlation properties that allow the receiver to differentiate between signals from different transmitters, thereby managing inter-cell interference while maintaining frequency reuse of 1

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent modifies the phase parameter of the transmitted signal by applying periodic phase modulation. This parameter change enables the receiver to identify and process signals from multiple transmitters separately, resolving the interference problem while maintaining high network capacity

Inventive Principle:

Principle #35Parameter changes

2Reliability

If CoMP techniques are used to enable connections to multiple base stations, then signal reception and throughput are improved, but coordination complexity between base stations increases

Engineering Contradiction:

Improvesignal receptionVSAvoidcoordination complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent enables each transmitter to independently apply periodic phase modulation to its signal without requiring complex real-time coordination with other transmitters. The receiver autonomously processes the periodically modulated signals from multiple transmitters, significantly reducing coordination complexity while maintaining improved signal reception

Inventive Principle:

Principle #25Self-service

3Productivity

If joint processing schemes are implemented for downlink transmission, then user equipment throughput is improved, but backhaul network data transfer requirements increase significantly

Engineering Contradiction:

Improveuser equipment throughputVSAvoidbackhaul data transfer

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The patent segments the symbol information into multiple transmissions from different base stations, with each transmitter sending periodically modulated signals independently. This segmentation allows distributed transmission without requiring centralized data collection, reducing backhaul data transfer requirements while maintaining high user equipment throughput

Inventive Principle:

Principle #1Segmentation

4Adaptability or versatility

If the number of users is increased to support future applications, then network coverage and service capability are improved, but interference levels and energy consumption increase

Engineering Contradiction:

Improvenetwork coverageVSAvoidenergy consumption

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The patent employs periodic phase modulation that enables efficient signal processing and interference management, allowing more users to be supported without proportionally increasing energy consumption. The periodic structure facilitates simpler receiver processing, reducing the energy required per user while maintaining network coverage

Inventive Principle:

Principle #19Periodic action

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach enables efficient signal processing and interference reduction, allowing for increased network capacity and user support without requiring complex coordination or optimization of the radio communication network, while maintaining signal quality and reducing energy consumption.

Implementation Method 1

modulating the phase of the radio frequency carrier with periodic phase modulation

Methodology Applied

Scientific EffectPhase modulation: Phase Modulation

Data Source

PatentUS11025474B2Multipoint transmission and reception in a radio communication network

Publication Date: 2021.06.01 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A periodic phase modulation, having a period shorter than a symbol period, is applied as a source modulation, in addition to a symbol modulation, to signals transmitted between a transmitter and a receiver in a communication network. Symbol value elements can be sent from multiple transmitters (203, 303, 603, 703) to a receiver (607, 207) in the same symbol period can be processed on the basis of the source modulation without destructive interference. In some embodiments, the symbol value elements sent by different transmitters can be combined in the receiver. In some embodiments, symbol value elements sent by different transmitters can be distinguished in the receiver.