Wireless Mesh Packet Forwarding via Synchronized Node-Independent Transmission
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Solution Overview
Problem
Wireless mesh networks face inefficiencies in packet forwarding due to overlapping transmissions causing decoding errors and increased contention on the medium, which results in reduced network capacity and coverage.
Innovation Solution
The method involves configuring over-the-air packets from different nodes to be node-independent and scheduling them for synchronized and simultaneous transmission, ensuring identical packets are transmitted with the same link layer address and at coordinated times to reduce interference and collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If nodes independently schedule and re-transmit packets using random delay to avoid collisions, then packet forwarding coverage is increased, but overlapping transmissions cause decoding errors and reduce reliability
Solution Approach 1:
Multiple nodes that would traditionally transmit different copies of the same packet are instead merged to transmit identical packets simultaneously. The packet content, including payload and CRC, is made identical across all transmitting nodes, transforming individual transmissions into a unified signal that combines constructively at the receiver, thereby eliminating decoding errors while maintaining extended coverage
Solution Approach 2:
The patent changes key packet parameters to achieve node-independence: the source address is replaced with a mesh network address, the destination address is replaced with a destination network layer address, and the CRC is recalculated over the modified packet content. These parameter changes ensure that packets from different nodes are identical over the air, enabling constructive combination without collisions or decoding errors
2Adaptability or versatility
If nodes re-transmit packets with different content due to node-specific fields, then individual node transmissions are unique, but interference between transmissions increases and reduces network capacity
Solution Approach 1:
The patent applies homogeneity by making all packet transmissions identical regardless of the transmitting node. The packet structure is standardized with network layer addresses replacing node-specific addresses, and the CRC is calculated over this standardized content. This homogeneous approach ensures that multiple nodes transmitting the same packet create constructive interference rather than destructive interference, thereby increasing network capacity while maintaining adaptability through the flooding mechanism
3Loss of information
If packets are transmitted with node-specific addresses and content, then packet routing information is preserved, but medium contention increases and reduces forwarding efficiency
Solution Approach 1:
The patent introduces network layer addresses as intermediaries that mediate between node-specific identification and efficient packet forwarding. Instead of using node-specific MAC addresses in transmissions, the packet carries network layer source and destination addresses that preserve routing information. This intermediary layer allows packets to be identical over the air while still containing necessary routing information, thereby reducing medium contention and improving forwarding efficiency
Data Source
AI summary
There is provided a method and corresponding arrangements and network nodes/devices for enabling packet forwarding in a wireless mesh network comprising a plurality of nodes. Basically, the method comprises conforming, for transmission of the same network layer information from at least two different nodes, the corresponding over-the-air packets to be node-independent, and scheduling the conformed over-the-air packets for synchronized and simultaneous transmission from the at least two different nodes.