Reachability Notification Optimization for UE Power Saving
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Solution Overview
Problem
Inefficient network resource usage due to frequent and numerous reachability notifications for UEs in power saving modes, particularly when using PSM and eDRX simultaneously, leading to increased processing and air interface resource waste in large networks.
Innovation Solution
Implementing a mechanism to determine and send a single notification with sufficient information about future reachability periods for UEs, reducing the frequency of notifications and improving accuracy and efficiency of downlink data delivery by tracking and calculating reachability patterns for UEs using PSM and eDRX.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network sends frequent reachability notifications for UEs in power saving modes, then the network can ensure timely delivery of downlink data, but network resources are wasted due to the large number of notifications required
Solution Approach 1:
The network performs preliminary actions by sending a single reachability notification that includes advance information about future reachability periods. This allows the network to proactively inform the application server about when the UE will be reachable, eliminating the need for continuous notification attempts and reducing network resource consumption while maintaining reliable data delivery.
Solution Approach 2:
The solution dynamically adapts the notification strategy by incorporating the UE's expected reachability patterns into the notification. Instead of using a static notification approach, the system dynamically adjusts the notification content to include future reachability information, optimizing the balance between delivery reliability and resource efficiency.
2Ease of operation
If the network continues to page the UE during power saving modes, then the UE can be reached when available, but network resources are drained due to repeated paging attempts
Solution Approach 1:
The network performs preliminary action by obtaining and including the UE's expected reachability pattern in the notification. This allows the network to anticipate when the UE will be reachable and plan paging attempts accordingly, rather than continuously paging the UE and wasting resources on futile attempts during unreachable periods.
3Loss of information
If multiple reachability notifications are sent for UEs using PSM and eDRX simultaneously, then reachability information can be maintained, but processing resources and air interface resources are wasted
Solution Approach 1:
The solution merges multiple notification functions into a single comprehensive notification. By combining reachability status information with future reachability period information in one notification message, the system eliminates the need for multiple separate notifications, reducing processing overhead and air interface resource usage while maintaining accurate reachability information.
Solution Approach 2:
The notification includes preliminary information about future reachability periods, allowing the application server to plan data transmission in advance. This eliminates the need for multiple follow-up notifications and processing cycles, reducing overall processing complexity while maintaining information accuracy.
Data Source
AI summary
An improved method and system of optimizing handling and sending of reachability notifications for a UE is disclosed. Solutions and implementations disclosed provide an efficient mechanism for determining the timing and duration of reachability periods for a UE and as a result predicting future reachability periods. This enables sending of one notification with sufficient information to inform the network of the time periods during which the UE is reachable instead of sending a notification each time the device becomes reachable.