Hierarchical Modulation Multiplexing for Unicast Bandwidth

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Solution Overview

Problem

Hierarchical modulation has not been effectively implemented in non-broadcast communication systems, such as unicast transmission, limiting its ability to optimize bandwidth utilization.

Innovation Solution

A method and device for hierarchical modulation of data streams in a communication network, where a user device multiplexes a base layer and an enhanced layer into a single stream and transmits it to an access node, allowing for efficient bandwidth allocation and extraction of both layers, enabling better bandwidth utilization in unicast transmissions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If hierarchical modulation is implemented in unicast transmission, then bandwidth utilization is improved, but device complexity increases

Engineering Contradiction:

Improvebandwidth utilizationVSAvoiddevice complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The data stream is segmented into multiple layers with different priorities (base layer and enhancement layers). Each layer is modulated independently with appropriate robustness levels, allowing selective reception based on channel conditions. This segmentation enables efficient bandwidth utilization while managing complexity through layered processing.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The modulation parameters are changed dynamically based on channel conditions and priority requirements. Different modulation schemes (e.g., QPSK for base layer, QAM16/QAM64 for enhancement layers) are applied to different layers, optimizing bandwidth utilization while maintaining manageable device complexity through parameter differentiation.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If multiple data streams are multiplexed into a single stream, then system throughput is improved, but signal-to-noise ratio degradation increases

Engineering Contradiction:

Improvesystem throughputVSAvoidsignal-to-noise ratio degradation

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

Different quality levels are applied to different parts of the data stream. The base layer receives higher quality treatment with more robust modulation to ensure reliable reception under poor channel conditions, while enhancement layers use less robust modulation for higher data rates. This local quality differentiation allows multiple streams to be multiplexed while managing SNR degradation through selective protection.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS10512068B2Method and device for hierarchical modulation of data streams

Publication Date: 2019.12.17 TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD

AI summary

This disclosure relates to a method and a device for implementing hierarchical modulation of data streams. According to one of the exemplary embodiments, disclosure is directed to a method for hierarchical modulation of two data streams transmitted from a user device in a communication network. The method would include not limited to: sending, via a transceiver in the user device, a request for uplink bandwidth to an access node in the communication network; receiving, via the transceiver, an uplink bandwidth allocation provided in a downlink channel from the access node; multiplexing, at the user device, a base layer data stream and an enhanced layer data stream into a single multiplexed data stream; and transmitting, via the transceiver, the single multiplexed data stream to the access node in the uplink bandwidth allocation.