Network Entity Paging Control for D2D Remote UEs
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Solution Overview
Problem
Current wireless communication systems face challenges in supporting device-to-device (D2D) direct communication, particularly in reducing unnecessary signaling overhead and improving IP address switching for remote UEs that move out of network coverage.
Innovation Solution
A method involving a network entity that receives a message from a relay UE indicating a direct connection with a remote UE has been established out of network coverage, and transmits a message to another network entity to stop paging, using identifiers like GUTI or GUMMEI to manage context information and connection states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network continues to page a remote UE that has moved out of coverage and established D2D direct communication, then the network can maintain the ability to reach the UE, but radio resources are wasted and signaling overhead increases
Solution Approach 1:
The patent extracts the paging function for remote UEs that have established D2D direct communication. When the network determines that a remote UE has successfully set up D2D direct communication with another UE, the network stops paging that specific UE. This extraction of the paging function for D2D UEs eliminates unnecessary radio resource consumption while maintaining network reachability for UEs that still require traditional network communication.
Solution Approach 2:
The patent implements dynamic paging behavior based on the communication state of the UE. The network entity (MME) dynamically adjusts whether to continue or stop paging a UE based on whether the UE has established D2D direct communication. This dynamic adaptation allows the system to optimize radio resource usage in real-time based on the actual communication needs and state of each UE.
2Adaptability or versatility
If the network maintains context information for all remote UEs, then the network can manage IP address switching and connection states, but signaling overhead increases
Solution Approach 1:
The patent applies local quality by differentiating the treatment of different UE groups in the network. Instead of uniformly maintaining context information for all UEs, the network entity selectively maintains context information only for UEs that require it (those not engaged in D2D direct communication). For UEs that have established D2D communication, the network stops paging and reduces context maintenance, thereby reducing signaling overhead while preserving IP address switching capability for UEs that need it.
3Loss of information
If the network pages every remote UE to maintain connection awareness, then the network can track UE locations and states, but the complexity of the paging process increases
Solution Approach 1:
The patent implements preliminary action by having the MME proactively determine and identify UEs that have established D2D direct communication before continuing to page them. The MME uses available information (such as D2D communication establishment notifications) to pre-identify which UEs should be excluded from the paging process. This preliminary identification simplifies the overall paging process by reducing the number of UEs that need to be paged, thereby reducing complexity while maintaining necessary tracking capabilities.
Data Source
AI summary
Disclosed are a method for supporting direct communication, and a network entity, the method receiving, from a relay UE, a message which notifies that it is not necessary to perform paging to a remote UE since a direct link to the remote UE is set, and transmitting, to a network entity, a message which notifies that it is not necessary to perform paging to the remote UE.