Multi-Channel MAC Protocol Home Channel Beacon
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Solution Overview
Problem
Existing multi-channel MAC protocols for IEEE 802.11-based ad hoc networks require impractical assumptions such as fine-grained clock synchronization and low channel switching latency, making them impractical for scalable and cost-effective implementation, especially in indoor deployments.
Innovation Solution
The proposed method assigns a home channel to each node, allowing asynchronous operation and providing information about temporary operating channels, enabling nodes to switch between channels without synchronization, using a single network interface and introducing new control frames for synchronization and channel redirection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-channel MAC protocols are used to improve network capacity, then channel utilization increases, but implementation complexity increases due to requirements for clock synchronization and low channel switching latency
Solution Approach 1:
The patent extracts and eliminates the requirement for fine-grained clock synchronization and low channel switching latency from the multi-channel MAC protocol. By removing these impractical assumptions, the protocol becomes suitable for scalable deployment in indoor environments while still achieving improved network capacity through multi-channel operation.
Solution Approach 2:
The patent introduces a beacon frame as an intermediary mechanism to enable coordination among nodes operating on different channels. The beacon frame carries channel assignment information that allows nodes to synchronize their operations without requiring fine-grained clock synchronization or low channel switching latency, thus reducing implementation complexity while maintaining network capacity improvement.
2Productivity
If nodes operate on multiple channels to avoid interference, then network capacity improves, but coordination among nodes becomes more difficult
Solution Approach 1:
The patent applies preliminary action by having nodes broadcast beacon frames before actual data transmission. These beacon frames pre-establish channel assignment information and coordination parameters, allowing nodes to operate on different channels without interference while maintaining easy coordination. The preliminary beacon exchange eliminates the need for complex real-time coordination mechanisms.
3Productivity
If multiple wireless channels are exploited to improve capacity, then channel capacity increases, but device complexity increases due to requirements for multiple network interfaces
Solution Approach 1:
The patent applies universality by designing a multi-channel MAC protocol that enables nodes with a single network interface to operate on multiple wireless channels. The beacon frame mechanism provides multi-functional capability, allowing one interface to perform both channel selection and coordination functions, thereby eliminating the need for multiple network interfaces while maintaining improved network capacity.
Data Source
AI summary
A method for communication between nodes in a wireless network, in particular in a wireless ad hoc or mesh network, wherein multiple wireless channels with different frequency bands are provided and wherein the nodes are enabled to operate on the different channels is characterized in that each the node has assigned a home channel where it usually resides, wherein a node that leaves its home channel and switches to another of the multiple channels—temporary operating channel—provides information about the temporary operating channel on the node's home channel.