Implicit Channel Tracking for Asynchronous Hopping Networks
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Solution Overview
Problem
Existing asynchronous channel hopping (USCH) networks in wireless networks face high overhead in maintaining synchronization, particularly due to memory-intensive transmissions of timing and channel information, which negatively impacts network performance, especially in low data rate networks.
Innovation Solution
The implementation of an implicit exchange of channel information and efficient timing information exchange, where the sleepy radio device tracks the coordinator's channel hopping sequence and updates its receive channel based on a function of the current channel, reducing the need for explicit US-IEs and UTT-IEs in every frame and ACK frame, and using elapsed duration to determine when to request timing information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If explicit timing information elements (UTT-IE) and channel information elements (US-IE) are transmitted in every frame and ACK frame, then synchronization accuracy is maintained, but network overhead increases and battery life decreases
Solution Approach 1:
The patent extracts and removes the explicit timing information elements (UTT-IE) and channel information elements (US-IE) from every frame transmission. Instead, it uses an implicit synchronization mechanism where the receiver autonomously tracks the transmitter's channel hopping sequence using a pre-shared seed value, eliminating the need for repeated explicit information exchange and thereby reducing energy consumption.
Solution Approach 2:
The receiver device performs self-service by autonomously generating and tracking the channel hopping sequence using the pre-shared seed value without requiring continuous explicit timing information from the transmitter. This self-tracking mechanism maintains synchronization accuracy while minimizing communication overhead and energy consumption.
2Measurement precision
If explicit channel information (US-IE) is transmitted in every poll frame, then channel tracking accuracy is maintained, but network overhead and data transmission time increase
Solution Approach 1:
The patent removes the explicit channel information element (US-IE) from poll frames by implementing an implicit channel tracking mechanism. Both transmitter and receiver use the same pre-shared seed value to independently generate identical channel hopping sequences, allowing the receiver to accurately track the current channel without explicit notification, thus reducing transmission time.
Solution Approach 2:
The channel hopping sequence is predetermined using a pre-shared seed value exchanged during initial network setup. This preliminary action enables both devices to independently generate the same sequence in advance, eliminating the need for real-time explicit channel information exchange during data transmissions.
3Reliability
If frequent synchronization information exchange is performed, then network synchronization is maintained, but network capacity and throughput decrease
Solution Approach 1:
The patent extracts and eliminates frequent explicit synchronization information exchanges by implementing an implicit synchronization mechanism. Devices maintain synchronization autonomously using pre-shared seed values to generate identical channel hopping sequences, thereby removing the overhead of repeated synchronization messages and improving network throughput.
Solution Approach 2:
Instead of continuous explicit synchronization exchanges, the patent uses periodic implicit synchronization where devices independently follow the predetermined channel hopping sequence. The pre-shared seed value ensures that both devices remain synchronized through the periodic channel hops without requiring active synchronization communication at each step.
Data Source
AI summary
A method of channel access for a radio device in an asynchronous channel hopping wireless network includes a channel hopping coordinator first radio device transmitting its receive (Rx) channel hopping sequence to a fixed or semi-channel hopping sleepy radio device. The sleepy radio device tracks the first radio device's Rx channel using the channel hopping sequence and transmits a poll frame exclusive of a unicast schedule information element (US-IE) on the first radio device's current Rx channel to the first radio device. The sleepy radio device moves to an updated Rx channel that is a function of the current Rx channel. The first radio device receives the poll frame and then computes the updated Rx channel as the function of the current Rx channel. After the computing, the first radio device transmits a data frame to the sleepy radio device on the updated Rx channel.