SuperMAC Frame Aggregation for Wireless Video Distribution

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Solution Overview

Problem

Current wireless home video distribution systems face inefficiencies due to the use of CSMA-based MAC layers, which lack quality of service (QoS) guarantees and are inefficient, especially in wireless networks with limited link rates, and existing no-new-wires technologies struggle with reliability and bandwidth management for bursty video traffic.

Innovation Solution

A TDMA-based MAC layer system that aggregates MAC protocol data units into a SuperMAC Frame, eliminating inter-frame spacing and PHY headers, and using a Header Correction Code to enhance error recovery, providing efficient bandwidth allocation and high QoS guarantees for distributing multimedia streams.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If CSMA-based MAC layer is used in wireless home video distribution systems, then ease of operation is improved, but network efficiency and QoS guarantees deteriorate

Engineering Contradiction:

Improveease of operationVSAvoidnetwork efficiency

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The patent implements a dynamic TDMA MAC layer that adapts time slot allocations based on traffic conditions and device requirements. The system dynamically adjusts the duration and assignment of time slots to optimize network efficiency while maintaining QoS guarantees, resolving the contradiction between ease of operation and network efficiency.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the fundamental MAC layer parameters from CSMA-based random access to TDMA-based scheduled access. By introducing time division parameters and allocation schedules, the system achieves deterministic QoS guarantees and improved network efficiency while maintaining operational simplicity through automated time slot management.

Inventive Principle:

Principle #35Parameter changes

2Quantity of substance

If multiple PHY packets are transmitted in each time allocation, then bandwidth utilization is improved, but overhead increases and network efficiency decreases

Engineering Contradiction:

Improvebandwidth utilizationVSAvoidoverhead

Core Design Contradiction:

Quantity of substanceVSLoss of energy

Solution Approach 1:

The patent merges multiple PHY packets into a single aggregated transmission within each time slot. By combining multiple MAC protocol data units into one physical layer transmission, the system eliminates repeated preambles and inter-frame spacing overhead, thereby reducing energy consumption and improving network efficiency while maintaining high bandwidth utilization.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent ensures continuous useful action by transmitting multiple data packets back-to-back within a time slot without interruption for retransmission or spacing overhead. This continuous transmission mode maximizes the utilization of allocated bandwidth while minimizing idle time and overhead, directly addressing the contradiction between bandwidth utilization and overhead loss.

Inventive Principle:

Principle #20Continuity of useful action

3Productivity

If TDMA MAC scheme with time allocations is used, then network efficiency is improved, but device complexity increases

Engineering Contradiction:

Improvenetwork efficiencyVSAvoiddevice complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent segments the network operation into discrete time slots allocated to different devices. By dividing the transmission medium into time-divided segments, the system achieves high network efficiency through scheduled access while managing device complexity through standardized time slot synchronization and simple acknowledgment mechanisms.

Inventive Principle:

Principle #1Segmentation

4Reliability

If Ethernet distribution system is used, then reliability is improved, but installation complexity and cost increase

Engineering Contradiction:

ImprovereliabilityVSAvoidinstallation complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces the mechanical Ethernet wiring system with a wireless TDMA MAC layer. By substituting physical cable connections with wireless time-division multiplexed communication, the system maintains reliability through scheduled access and error correction while eliminating installation complexity associated with running Ethernet cables and configuring switches.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS9385881B2Media access control protocol data unit aggregation in a time division multiple access media access control layer

Publication Date: 2016.07.05 THOMSON LICENSING SA

AI summary

A method and apparatus are described for creating a multi-media stream (e.g., video, voice, audio, etc. . . . ) Super-MAC frame in a physical protocol data unit, including inserting a physical layer header into a channel time allocation and generating the multi-media stream SuperMAC frame further including, appending a media access control header after the physical layer header, calculating a header correction code, appending the header correction code after the media access control header, appending a media access control multi-media stream payload from a transmit queue, calculating a frame check sequence, appending the frame check sequence after the media access control multi-media stream payload and repeating the above acts, after inserting the physical layer header, until one of the channel time allocation is full or all transmit queues are empty.