Asynchronous NOMA Time Constraints in TDMA Networks

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Solution Overview

Problem

Synchronized Asynchronous Code Multiple Access (ACMA) transmission systems face reduced multiple access capacity and stringent timing requirements, leading to increased power consumption and inflexibility in user terminal synchronization.

Innovation Solution

A system that allocates a continuous duration within a Time Division Multiple Access (TDMA) scheme for asynchronous Non-Orthogonal Multiple Access (NOMA) transmissions, allowing user terminals to perform transmissions within start and termination time constraints, enabling flexible synchronization and increased capacity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If ACMA transmissions are completely asynchronous without time constraints, then multiple access capacity increases, but timing synchronization becomes difficult and power consumption increases

Engineering Contradiction:

Improvemultiple access capacityVSAvoidpower consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent applies parameter changes by introducing time constraint parameters (start time constraint and termination time constraint) that bound the asynchronous transmissions. This transforms the completely asynchronous system into a constrained asynchronous system, optimizing the balance between capacity and power consumption by limiting the time window for transmissions while still allowing flexibility within that window.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If ACMA transmissions are completely asynchronous without time constraints, then multiple access capacity increases, but timing synchronization precision deteriorates

Engineering Contradiction:

Improvemultiple access capacityVSAvoidtiming synchronization precision

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent introduces time constraint parameters that define a bounded time window for asynchronous transmissions. This parameter change maintains the asynchronous nature (different start times) while improving timing synchronization precision by establishing clear start and termination boundaries that all transmissions must adhere to.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If ACMA transmissions are completely asynchronous, then multiple access capacity increases, but system flexibility decreases

Engineering Contradiction:

Improvemultiple access capacityVSAvoiduser terminal synchronization flexibility

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent changes the system parameters by introducing configurable time constraints (start time constraint and termination time constraint) that can be adjusted to balance capacity and flexibility requirements. This allows the system to adapt to different operational scenarios while maintaining asynchronous transmission capabilities.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11251892B2Asynchronous non-orthogonal multiple access in a time/frequency division orthogonal multiple access network

Publication Date: 2022.02.15 HUGHES NETWORK SYST

AI summary

Systems and methods are described, and one method includes allocate a continuous duration within a TDMA scheme, for asynchronous NOMA transmissions, and extending from an allocation start time to an allocation termination time, formed of contiguous time slots of the TDMA scheme, and included providing to asynchronous NOMA user terminals an indication of the allocation start time and termination time, indicating allowance to perform asynchronous NOMA transmissions within a start time constraint that starts of the asynchronous NOMA transmissions do not precede the allocation start time, and terminations of the asynchronous NOMA transmissions do not succeed the allocation termination time.