Tree Mesh Framing Slot Scheduling for Low-Interference Relay Access

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Solution Overview

Problem

Wireless mesh networks face issues with radio interference and unfair access to the transmission medium due to competing routing nodes, leading to impaired system throughput and inefficiencies, particularly in multi-hierarchical and relay communication systems.

Innovation Solution

The method involves scheduling downlink and uplink channels in a synchronized hierarchical Tree Mesh network by allocating and mapping Framing Slots within Multi-Frames for multiple associated Node Groups, dividing clusters into groups, and using a Root AP to synchronize nodes for efficient communication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If routing nodes use RTS/CTS packet collision avoidance mechanism, then radio interference is reduced, but system throughput is drastically impaired due to reserved transmission medium

Engineering Contradiction:

Improveradio interferenceVSAvoidsystem throughput

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The patent segments the transmission medium access by dividing routing nodes into different groups (first group and second group) with distinct transmission characteristics. The first group uses traditional RTS/CTS mechanisms while the second group employs synchronized framing with dedicated time slots, allowing both approaches to coexist and optimizing overall system throughput while maintaining interference reduction benefits.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces dynamic switching capability between different transmission modes for routing nodes. Nodes can dynamically select between RTS/CTS based transmission and synchronized framing based transmission depending on network conditions, enabling flexible adaptation to optimize both interference avoidance and throughput performance.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If multiple routing nodes share frequency resources, then network coverage is extended, but radio interference increases among routing nodes

Engineering Contradiction:

Improvenetwork coverageVSAvoidradio interference

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent segments routing nodes into multiple groups with different transmission protocols. The first group uses traditional contention-based access while the second group uses scheduled access with dedicated time slots, allowing frequency resources to be shared more efficiently and reducing interference as network coverage expands.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a temporal dimension to frequency resource allocation by implementing synchronized framing with dedicated time slots for different node groups. This time-frequency separation allows multiple routing nodes to share frequency resources without mutual interference, extending network coverage while maintaining low interference levels.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Reliability

If RTS packets are transmitted to notify intended transmission, then transmission medium reservation is achieved, but access fairness among routing nodes is not ensured

Engineering Contradiction:

Improvetransmission medium reservationVSAvoidaccess fairness

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent segments routing nodes into first and second groups with different access mechanisms. The second group's synchronized framing approach with dedicated time slots ensures predictable and fair access for members of that group, while the first group maintains traditional reservation mechanisms, achieving both reliability and fairness through differentiated service.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The synchronized framing mechanism incorporates feedback elements where the coordinator communicates scheduled time slots to routing nodes in the second group. This feedback-based scheduling ensures that nodes receive fair access opportunities according to their priorities and requirements, improving access fairness while maintaining reliable transmission medium reservation.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12490253B2Synchronized framing scheduling methods and systems for wireless tree mesh networks

Publication Date: 2025.12.02 COMMTACT LTD

AI summary

There are provided for scheduling a plurality Framing Slots in one or more Multi-Frames in a synchronized hierarchical Tree Mesh network, comprising: one or more Clusters, each Cluster comprises: a Single Root Access Point (AP) used as a master of the Cluster; a plurality of Relay Nodes, one or more Station Nodes (STAs), wherein the one or more Multi-Frames comprise said plurality of Framing Slots, wherein each Framing Slot comprises downlink (DL) and uplink (UL) transmissions, the method comprising the steps of: dividing said one or more Clusters to at least two Groups of Relay Nodes; allocating, respectively, Framing Slots in said Multi-Frame per each Group of Relay Nodes of said at least two Groups of Relay Nodes, so each Group of Relay Nodes is respectively related to one or more allocated Framing Slots within the Multi-Frame.