MME-Assisted System Information Update for Extended DRX Power Savings
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Solution Overview
Problem
In LTE systems, UEs with extended DRX periods may miss system information modification notifications due to valueTag wrapping, leading to inefficient power consumption and potential missed updates, as existing solutions either require frequent SIB reading or result in unnecessary power usage.
Innovation Solution
An apparatus and method that monitor system information updates and page terminals only when relevant, using the MME to manage paging notifications and determine if updates occurred during the UE's sleep period, thereby optimizing power consumption and minimizing unnecessary SIB reading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If extended DRX is used to save power, then power consumption is reduced, but system information modification notifications may be missed due to valueTag wrapping
Solution Approach 1:
The patent segments the system information update notification mechanism into two independent parts: the valueTag wrapping mechanism (which causes the problem) and the MME-assisted notification mechanism (which solves it). By separating these functions and having the MME independently track and manage notifications, the system can maintain reliable delivery without being constrained by the valueTag limitations, thus resolving the contradiction between power saving and notification reliability.
Solution Approach 2:
The MME acts as an intermediary between the eNodeB and the UE for managing system information updates during extended DRX. Instead of relying solely on the valueTag mechanism that suffers from wrapping issues, the MME provides centralized tracking and coordination, ensuring that notifications are delivered reliably even when the UE is in deep sleep mode, thereby maintaining reliability while preserving power savings.
2Reliability
If frequent SIB reading is performed to ensure updates are not missed, then notification reliability is improved, but power consumption increases
Solution Approach 1:
The MME performs preliminary tracking of system information updates before the UE needs to check for changes. By maintaining a record of which SIBs have been updated and when, the MME can proactively manage the notification process, allowing the UE to wake up only when necessary and receive targeted notifications, thus avoiding unnecessary SIB readings while ensuring reliability.
Solution Approach 2:
The patent implements a feedback mechanism where the MME tracks update status and uses this information to control notification delivery. The MME receives feedback about which SIBs need updating and manages the notification process accordingly, allowing the UE to receive only necessary notifications without performing frequent full SIB reads, thereby maintaining reliability while minimizing power consumption.
3Reliability
If the UE checks system information frequently to avoid valueTag wrapping issues, then notification reliability is improved, but device complexity increases
Solution Approach 1:
The MME serves as an intermediary that handles the complexity of tracking valueTag wrapping and managing notification timing. Instead of the UE needing to implement complex logic to handle wrapping scenarios, the MME centralizes this management function, simplifying the UE's task to merely receiving notifications when appropriate, thus improving reliability without increasing UE complexity.
Solution Approach 2:
The MME performs self-service by autonomously tracking system information updates and managing the notification delivery process. This self-service capability eliminates the need for the UE to implement complex wrapping detection and handling logic, as the MME independently manages the entire process, thereby maintaining reliability while keeping the UE simple.
Data Source
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AI summary
It is provided a method, comprising monitoring if an information on an update of a system information of a first cell is received; checking if a terminal is registered as being served by at least one cell of a group of one or more cells comprising the first cell; checking if the terminal becomes reachable after being asleep; requesting to page the terminal by a paging message if the information on the update is received, the terminal is served by the at least one cell of the group, and the terminal becomes reachable, wherein the paging message comprises an indication on the update.