Dynamic Channel Bonding Protocol for Wireless Networks
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Solution Overview
Problem
Current wireless communication technologies face inefficiency and unfairness in channel bonding due to the need for all narrow channels to be idle before transmission, leading to delayed data transfer and collisions, especially in heterogeneous radio environments, and lack an efficient mechanism for spectrum agreement between transmitters and receivers.
Innovation Solution
A dynamic channel bonding protocol that allows nodes to initiate transmission as long as some channels are idle, using a compound preamble for collision detection and parallel bitwise arbitration to resolve collisions, and partial spectrum correlation to ensure the receiver can decode packets by identifying used channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a device operates in a wide channel that spans across multiple narrow channels, then data rate is improved, but transmission efficiency deteriorates because the device has to defer transmission until all narrow channels are vacant
Solution Approach 1:
The patent divides the wide channel into multiple narrow channels and allows independent access to each narrow channel. Devices can transmit on available narrow channels without waiting for all channels to be vacant, thus maintaining high data rates while improving transmission efficiency through parallel channel utilization.
Solution Approach 2:
The patent allows devices to transmit on a subset of available narrow channels rather than requiring all channels to be free. This partial action approach enables transmissions to proceed when some channels are idle, improving efficiency while still utilizing wide channel capabilities for high data rates when sufficient channels are available.
2Ease of operation
If narrow channel devices work independently in non-overlapping narrow channels, then medium access fairness is improved, but channel bonding efficiency deteriorates because wide channel devices have harder time winning media access opportunities
Solution Approach 1:
The patent introduces a unified contention mechanism that acts as an intermediary between narrow channel devices and wide channel devices. This mechanism allows wide channel devices to contend for multiple narrow channels simultaneously while ensuring fair access for narrow channel devices, resolving the conflict between fairness and bonding efficiency.
Solution Approach 2:
The patent merges the contention processes for multiple narrow channels into a unified arbitration mechanism. Wide channel devices can participate in combined contention across multiple channels, improving their access efficiency while maintaining fairness for narrow channel devices through the integrated arbitration process.
3Productivity
If spectrum-agile designs aggregate noncontiguous narrow channels as one channel, then spectral efficiency is improved, but fairness deteriorates because new channels cannot be utilized until the next frame and some nodes may never acquire the channel
Solution Approach 1:
The patent implements dynamic channel aggregation where the set of aggregated narrow channels can change within a transmission frame based on real-time availability. Nodes can dynamically acquire and release channels during transmission, allowing new channels to be utilized immediately when available rather than waiting for frame boundaries, thus improving fairness while maintaining spectral efficiency.
4Reliability
If control packets are used to achieve spectrum agreement between transmitter and receiver, then reliability is improved, but overhead increases due to medium access contention and physical layer convergence procedure
Solution Approach 1:
The patent performs spectrum agreement as a preliminary action before data transmission by exchanging control packets to negotiate and confirm the set of narrow channels to be used. This preliminary spectrum agreement ensures reliable channel allocation before bulk data transfer, reducing the need for continuous control packets during transmission and thereby reducing overall overhead while maintaining reliability.
Data Source
AI summary
To address the inefficiency and unfairness issues in channel bonding, a dynamic channel bonding protocol is presented in which a node is allowed to start a transmission as long as a narrow channel is available and gradually increase channel width during transmission whenever a new narrow channel becomes available. The protocol aggregates all available narrow channels as one wide channel, removing the need of setting guard bands between contiguous narrow channels. A challenge in dynamic channel bonding is the communication over uncertain channels. To enable fast spectrum agreement between transmitter and receiver, a partial spectrum correlation method is introduced. When new channels become available, multiple nodes may contend for them. A compound preamble is designed to make collisions detectable in the frequency domain and a parallel bitwise arbitration mechanism is used to quickly resolve the collisions in the time domain.