IIoT UE Reselection Flag for Power Saving
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Solution Overview
Problem
In industrial internet of things (IIoT) operations, unnecessary reselection by IoT devices leads to increased power consumption due to frequent wake-ups to read target cell MIB/SIBs without significant improvements in paging reception performance, especially when signal-to-noise ratios (SNR) of source and target cells are comparable.
Innovation Solution
Implementing a reselection flag system that sets a 'no-reselection' state when the source cell's SNR exceeds a predetermined maximum, and an 'allow-reselection' state when the target cell's SNR is significantly better, preventing unnecessary reselection and maintaining service on the source cell when conditions are comparable, thus reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If IoT devices perform frequent cell reselection to check target cells, then paging reception performance may be improved, but power consumption increases due to frequent wake-ups
Solution Approach 1:
The system performs preliminary evaluation of cell reselection conditions by comparing SNR values before actually executing reselection. The UE measures SNR of both source and target cells in advance and uses this information to determine whether reselection is necessary, avoiding unnecessary wake-ups and power consumption while ensuring paging performance is maintained when needed.
Solution Approach 2:
The system implements a feedback mechanism where the UE continuously monitors SNR values of source and target cells and adjusts reselection behavior based on this feedback. When the SNR difference falls below a threshold, the UE decides against reselection, thereby reducing power consumption while maintaining adequate paging reception performance through adaptive decision-making.
2Adaptability or versatility
If IoT devices wake up frequently to read target cell MIB/SIBs, then cell reselection can be performed, but power consumption increases significantly
Solution Approach 1:
The UE performs preliminary SNR measurement and comparison before initiating the wake-up and MIB/SIB reading process. By evaluating whether the target cell's SNR is sufficiently better than the source cell in advance, the system avoids unnecessary wake-ups and data transmission, significantly reducing power consumption while preserving the ability to perform reselection when truly beneficial.
Solution Approach 2:
The system applies partial action by measuring only the SNR values of source and target cells without performing the full reselection procedure (including MIB/SIB reading and actual cell switching) when the SNR difference is insufficient. This selective approach reduces power consumption by executing only the necessary measurements while maintaining full reselection capability when conditions warrant it.
3Reliability
If the reselection threshold is set low, then more cells can be evaluated for optimal paging performance, but unnecessary reselections increase power consumption
Solution Approach 1:
The system dynamically adjusts the reselection threshold parameter based on the SNR difference between source and target cells. When the SNR difference is small, a higher threshold is effectively applied to prevent unnecessary reselections and reduce power consumption. When the SNR difference is large, a lower threshold allows more aggressive reselection to maintain paging performance, optimizing the balance between reliability and energy efficiency.
Data Source
AI summary
This disclosure provides systems, methods, and devices for wireless communication that support reselection procedures for power saving in industrial internet of things (IIoT) operations. In a first aspect, a method of wireless communication includes a user equipment (UE) setting a reselection flag to a no-reselection state either by default or in response to a source cell signal-to-noise ratio (SNR) exceeding a predetermined maximum SNR. The UE can set the flag to the allow-reselection state in response to the target cell SNR range exceeding the source cell SNR range or the source cell SNR being below a predetermined minimum SNR. The UE may then either reselect to the target cell when appropriate or maintain service on the source cell based on the state of the reselection flag. Other aspects and features are also claimed and described.