Aggregated PPDU Channel Loading for One-to-Many Networks

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Solution Overview

Problem

Existing communication systems face inefficiencies in channel loading due to increased overhead from separate Physical Layer Protocol Data Units (PPDUs) and waiting times for acknowledgments, which reduce channel loading efficiency in one-to-many communications.

Innovation Solution

A master network device generates a data frame with a payload containing symbols or frequency carriers allocated to multiple client network devices, using either a time-domain or frequency-domain technique, to reduce overhead and latency by combining data and synchronizing transmissions efficiently.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If separate PPDUs are used for downstream one-to-many communication, then each client device can be addressed individually, but header information in each PPDU increases overhead and reduces channel loading efficiency

Engineering Contradiction:

Improveindividual client addressingVSAvoidheader overhead

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent combines multiple separate PPDUs into a single aggregated PPDU that contains data for multiple client devices. The aggregated PPDU includes a single header structure that identifies multiple destination client devices, thereby eliminating the need for redundant header information in separate PPDUs and reducing overall overhead while maintaining individual client addressing capability

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The header structure in the aggregated PPDU is designed to be universal, serving multiple functions by identifying multiple destination client devices within a single header. This multi-functional header replaces what would otherwise require multiple separate headers, reducing overhead while preserving individual addressing capability

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If the master network device waits for acknowledgment after transmitting each PPDU, then transmission reliability is maintained, but the gap between transmissions reduces channel loading efficiency

Engineering Contradiction:

Improvetransmission acknowledgmentVSAvoidtransmission gap

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent implements preliminary action by transmitting multiple data units in an aggregated PPDU before requiring acknowledgments. The master network device sends all intended data for multiple clients in a single transmission burst, then waits for acknowledgments afterward. This eliminates the time gaps that would occur if acknowledgments were required after each individual PPDU, while maintaining reliability through the acknowledgment mechanism

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The aggregated PPDU transmission enables continuous useful action by keeping the communication channel actively loaded with data transmissions. Instead of having the channel idle during acknowledgment waits between separate PPDUs, the channel remains continuously utilized with the aggregated transmission, improving channel loading efficiency while reliability is maintained through the acknowledgment process

Inventive Principle:

Principle #20Continuity of useful action

3Productivity

If multiple separate PPDUs are transmitted to multiple client devices, then each client receives dedicated data, but channel loading efficiency is significantly reduced

Engineering Contradiction:

Improvechannel loading efficiencyVSAvoidnumber of PPDUs

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The patent merges multiple separate PPDUs into a single aggregated PPDU that contains data for multiple client devices. This consolidation reduces the total quantity of PPDUs from multiple separate transmissions to one aggregated transmission, thereby significantly improving channel loading efficiency while ensuring each client receives its dedicated data through proper identification in the aggregated structure

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS9800520B2Channel loading for one-to-many communications in a network

Publication Date: 2017.10.24 QUALCOMM INC

AI summary

A master network device determines to transmit data from the master network device to a plurality of client network devices of a network. In one example, the master network device can generate a data frame including a payload with a plurality of symbols. The payload may include at least one symbol allocated for each of the client network devices. The plurality of symbols may be arranged in a predefined pattern in the payload. In another example, the master network device may generate a data frame including a payload with one or more symbols. Each symbol may include a plurality of frequency carriers, and may include at least one frequency carrier allocated for each of the client network devices. The plurality of frequency carriers can be allotted to the client network devices according to a partitioning pattern. The master network device then transmits the data frame to the client network devices.