Wireless Sensor Node Data Correlation for Collision Reduction
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Solution Overview
Problem
Current wireless control area network techniques experience unpredictable data transfer delays due to synchronized data bursts from sensor nodes, leading to inefficient bandwidth usage and non-deterministic communication cycles in patient monitoring systems.
Innovation Solution
A method is introduced where sensor nodes create a correlation between poll packet arrival times and data arrival times using a 'Data to Send' (DTS) frame, allowing nodes to transmit data only when the channel is available, and employing counters for retrying transmissions and deferring data frames to minimize collisions and delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sensor nodes transmit data in synchronized bursts during polling cycles, then data transfer from all nodes is achieved, but data transfer delays increase and bandwidth efficiency deteriorates
Solution Approach 1:
The patent applies preliminary action by having sensor nodes prepare data frames in advance during the beacon period, before the actual polling occurs. Nodes that have data ready generate data frames proactively, and the access coordinator collects these frames before initiating the polling sequence. This eliminates waiting time during polling and reduces overall data transfer delays, as data is ready to be transmitted immediately when the channel becomes available.
2Reliability
If the access coordinator polls all sensor nodes in a fixed sequence, then complete data collection is ensured, but communication cycle duration becomes unpredictable
Solution Approach 1:
The patent applies partial action by having the access coordinator poll only those sensor nodes that have indicated they have data to transmit. Instead of following a fixed round-robin sequence that polls all nodes regardless of data availability, the coordinator uses the data frame information to dynamically adjust the polling sequence, polling only necessary nodes. This reduces communication cycle duration and improves predictability while still ensuring complete data collection from all nodes that have data.
3Productivity
If multiple sensor nodes transmit data simultaneously, then bandwidth utilization improves, but collision probability increases
Solution Approach 1:
The patent applies segmentation by dividing the data transmission process into separate time slots for different sensor nodes. The access coordinator segments the polling sequence based on which nodes have data to transmit, allocating specific time slots to each node. This prevents simultaneous transmissions and collisions while maintaining efficient bandwidth utilization, as the channel is continuously used without idle periods or retransmissions.
Data Source
AI summary
A method for communicating data in a wireless control area network, where the wireless control area network includes one or more sensor nodes configured to facilitate acquisition of patient data and an access coordinator configured to facilitate acquisition of the patient data from the one or more sensor nodes, is presented. The method includes creating a correlation between one or more poll packets from an access coordinator and time of arrival of data at one or more sensor nodes. Systems and computer-readable medium that afford functionality of the type defined by this method is also contemplated in conjunction with the present technique.