UE Reachability Detection During Long DRX and Power Saving
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Solution Overview
Problem
Existing solutions fail to address the issue of a mobile terminal being unreachable for downlink user plane data during long DRX cycles or power saving states, leading to excessive signaling in the network.
Innovation Solution
Implementing a method and device at the MME or SGW/PGW nodes to detect when a UE is incapable of replying to messages by determining its state through DRX cycles or power saving modes, and providing an estimated time for when it will be capable of responding, thereby avoiding unnecessary signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If long DRX cycles are used to reduce power consumption and resource usage, then power consumption and resource consumption are reduced, but the UE becomes unreachable for downlink user plane data causing excessive signaling
Solution Approach 1:
The network performs preliminary actions by sending paging requests before the UE becomes reachable, and estimates the time when the UE will be capable of replying. This allows the network to proactively manage communication with UEs in long DRX cycles rather than reacting when the UE becomes reachable.
Solution Approach 2:
The system introduces feedback mechanisms where the network estimates and reports back the time when the UE will be capable of replying to messages. This feedback loop allows the network to adjust its signaling strategy based on the predicted reachability status of UEs in power-saving modes.
2Productivity
If the network sends messages to UEs in long DRX cycles, then data transmission can occur, but excessive signaling occurs because the UE cannot reply
Solution Approach 1:
The network performs preliminary assessment of UE reachability by estimating when the UE will be capable of replying before attempting data transmission. This preliminary action prevents unnecessary signaling by identifying suitable transmission windows in advance.
Solution Approach 2:
The system uses the UE's own DRX cycle information and timing characteristics to determine when the UE will be reachable, allowing the network to self-adjust its signaling strategy without requiring additional UE responses or acknowledgments during the unreachable period.
3Adaptability or versatility
If the network attempts to establish bearers with unreachable UEs, then bearer establishment can be initiated, but unnecessary signaling and resource consumption occur
Solution Approach 1:
The system implements feedback by estimating the time when the UE will be capable of replying and using this information to decide whether to proceed with bearer establishment. This feedback mechanism prevents wasteful resource consumption by avoiding bearer establishment attempts during periods when the UE is unreachable.
Solution Approach 2:
The network dynamically adjusts its bearer establishment strategy based on the estimated reply capability of the UE. Instead of using a static approach, the system adapts its actions according to the predicted reachability status, optimizing resource usage while maintaining bearer establishment capability when appropriate.
Data Source
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AI summary
The invention relates to methods and device for detecting when a mobile terminal is in a state where it is incapable of replying to a message. In a first aspect of the present invention, it is provided a method of detecting, at a mobility node in a communications network, a state where a mobile terminal is incapable of replying to a message. The method comprises receiving (Sioi) the message from a gateway node, and determining (S102) whether the mobile terminal is incapable of replying to the message. Further, the method comprises sending (S103) a response to the gateway node indicating that the mobile terminal is not yet capable to reply to the message.