Wireless Sensor Network Association Request Transmission
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Solution Overview
Problem
The inefficiency of association request transmissions in wireless sensor networks due to data collisions and high power consumption, particularly during shared time slots, which leads to delayed node association and reduced power efficiency.
Innovation Solution
Transmitting association requests during either shared or dedicated time slots based on the timing of dedicated slots and data collision rates, allowing intermediate nodes to decide whether to use dedicated or shared slots to minimize collisions and optimize power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If association requests are transmitted during shared time slots, then any node can use the channel, but data collisions occur and retransmissions are needed
Solution Approach 1:
The patent segments the transmission medium by introducing virtual channels within shared time slots. Each intermediate node is assigned a unique virtual channel identifier, allowing multiple nodes to transmit simultaneously without collision. This divides the single shared channel into multiple logical channels, resolving the contradiction between channel accessibility and data collision rate.
Solution Approach 2:
The patent introduces virtual channel identifiers as an intermediary mechanism. These identifiers act as mediators that allow multiple intermediate nodes to share the same physical time slot without conflict. The virtual channel concept enables discrimination between different node's transmissions, eliminating data collisions while maintaining shared slot efficiency.
2Use of energy by moving object
If intermediate nodes do not listen during shared time slots to save power, then power consumption is reduced, but association requests experience further delay
Solution Approach 1:
The patent applies preliminary action by having intermediate nodes listen during the initial beacon phase before shared time slots. Nodes acquire time slot information and virtual channel assignments in advance, allowing them to enter sleep mode during shared slots while still being able to receive association requests directed to their assigned virtual channels. This preliminary information gathering enables power savings without significant delay.
Solution Approach 2:
The virtual channel identifier serves as an intermediary that enables asynchronous operation. Intermediate nodes can sleep during shared time slots because the virtual channel mechanism allows them to be addressed specifically when awake, eliminating the need to continuously monitor all shared slot transmissions. This resolves the contradiction between power consumption and association delay.
3Reliability
If association requests are retransmitted due to collisions, then the association process eventually completes, but power efficiency is reduced
Solution Approach 1:
By segmenting the shared channel into multiple virtual channels, the patent eliminates the need for retransmissions caused by collisions. Each intermediate node transmits on its assigned virtual channel without interfering with others, ensuring first-attempt success and maximizing power efficiency by avoiding repeated transmissions.
Solution Approach 2:
The patent implements feedback through the beacon mechanism that provides each intermediate node with its assigned virtual channel identifier. This feedback enables nodes to transmit association requests correctly on the first attempt by knowing their designated virtual channel, preventing collisions and the associated power waste from retransmissions.
Data Source
AI summary
A method of transmitting association requests in a wireless sensor network includes transmitting an association request from a leaf node to an intermediate node. The method further includes transmitting the association request from the intermediate node during one of either a shared time slot or a dedicated time slot in response to at least one of the timing of dedicated time slots and data collision rates during shared time slots.