Network-Assisted ProSe Discovery Context Management
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in managing proximity device discovery for ProSe services, particularly in terms of resource usage, power consumption, and control signaling overhead, especially in social use cases where devices need to selectively detect friends' presence while minimizing unnecessary signaling.
Innovation Solution
Introducing a discovery context management system that synchronizes information between user equipment (UE) and the network, using a discovery context that includes lists of interested friends, allocated beacon channels, and ProSe application IDs, with network-assisted signaling to optimize beacon signal transmission and detection, and implementing a Discovery Update Control Channel (DUCCH) for efficient context updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If devices continuously monitor and transmit beacon signals for proximity discovery, then discovery reliability is improved, but power consumption and resource usage increase
Solution Approach 1:
The system implements periodic beacon signal transmission and monitoring only when discovery context is active and needed, rather than continuous operation. The discovery context can be established and terminated based on service requirements, creating periodic discovery cycles that maintain reliability while reducing overall power consumption during idle periods.
Solution Approach 2:
The network automatically manages discovery context establishment and maintenance based on service requirements and device states. When a device enters idle state or service is no longer needed, the network autonomously terminates the discovery context, eliminating the need for continuous device-side monitoring and reducing power consumption while maintaining discovery capability when needed.
2Reliability
If devices establish discovery context for all potential friends, then discovery completeness is improved, but control signaling overhead increases
Solution Approach 1:
The system establishes discovery contexts selectively for specific target devices rather than all potential friends. The discovery context indication message allows a device to specify particular target device identifiers for which discovery context should be established, creating localized discovery relationships only where needed, thus reducing overall signaling overhead while maintaining complete discovery for relevant targets.
Solution Approach 2:
The discovery process is segmented into specific target-device relationships rather than a blanket all-to-all discovery approach. Each discovery context is established independently for specific target devices, allowing the system to manage multiple discrete discovery relationships efficiently, reducing the total signaling overhead compared to a unified comprehensive discovery mechanism.
3Measurement precision
If the network maintains discovery context for all users, then discovery accuracy is improved, but network resource usage increases
Solution Approach 1:
The network maintains discovery context information selectively for specific user pairs rather than all users. When a discovery context indication is received, the network establishes and maintains context only for the specified target devices, keeping discovery accuracy high for relevant relationships while minimizing network resource usage by not maintaining unnecessary context for unrelated user pairs.
Data Source
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Figure 2
Figure 3a~3b
AI summary
The application deals with network assisted ProSe discovery management. In particular, a network element maintains a discovery context of user equipments with active ProSe applications and instruct UEs in a common area to transmit/detect beacon signals. This discovery context includes for a user specific information on a list of friends that the user is interested in discovering and for which proximity discovery is potentially possible. The discovery context further comprises the allocated beacon chnannel ofd each friend in the list.