Cell Reselection in Paging for IoT Positioning Accuracy
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Solution Overview
Problem
Existing methods for positioning wireless devices, particularly low-cost cellular IoT devices, result in wasted time-frequency resources, suboptimal positioning accuracy, and unnecessary energy consumption, especially for devices with limited battery life.
Innovation Solution
A method where a first network node initiates a paging request to a second network node to instruct the wireless device to initiate cell reselection before responding, ensuring the response is sent from the best available cell, thereby enabling more accurate positioning with reduced battery consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the wireless device responds to paging request immediately without cell reselection, then the response time is reduced and energy consumption is minimized, but the positioning accuracy deteriorates because the device may not be in the optimal cell
Solution Approach 1:
The patent applies preliminary action by instructing the wireless device to perform cell reselection before responding to the paging request. The network node includes an indication in the paging request that triggers the device to initiate cell reselection procedures, ensuring the device is camped on the best available cell before sending the response. This preliminary cell selection action improves positioning accuracy by ensuring measurements are taken from the optimal cell, while the indication mechanism keeps the additional time requirement minimal.
2Measurement precision
If the wireless device performs cell reselection before responding to paging request, then the positioning accuracy is improved by ensuring communication with adjacent cells, but the energy consumption increases due to additional measurements and transmissions
Solution Approach 1:
The patent applies preliminary action by performing cell reselection before the positioning measurement, ensuring the device is already camped on the optimal cell. This eliminates the need for repeated cell selection operations during the positioning procedure, thereby reducing overall energy consumption while maintaining high positioning accuracy.
Solution Approach 2:
The network node provides self-service by including the indication directly in the paging request message that the device must receive anyway. The device autonomously performs the cell reselection based on this indication without requiring additional separate signaling or commands, thereby minimizing additional energy expenditure while ensuring accurate positioning measurements are taken from the best available cell.
3Measurement precision
If the network sends paging request with cell reselection indication, then the positioning accuracy is improved, but the device complexity increases due to additional processing requirements
Solution Approach 1:
The patent applies self-service by leveraging the device's existing paging and cell selection functionality. The device already has the capability to interpret paging requests and perform cell reselection based on standard indicators. The network simply reuses these existing mechanisms by including an indication in the paging request, avoiding the need for new complex processing logic in the device while still achieving improved positioning accuracy.
Data Source
AI summary
Method performed by a first network node (101), e.g. a SGSN or an MME. The first network node (101) initiates sending (401) a first paging request to a second network node (102), e.g. a node of a Base Station Subsystem (BSS), which indicates that a wireless device (141) served by the second network node (102) is to initiate cell reselection prior to sending a first response, based on the first paging request, wherein the wireless device (141) is to be paged for a positioning procedure, e.g. a timing advance (TA) multilateration.