D2D Discovery Buddy List Signaling Overhead Reduction
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in device-to-device (D2D) communication, particularly in reducing signaling overhead and interference, which hinders the adoption of D2D communication and limits cellular network control over D2D traffic.
Innovation Solution
A method where a base station uses a buddy list from user equipment to initiate a device-to-device discovery process, reducing unnecessary signaling by determining when to initiate D2D communication links and managing D2D connections within its coverage area, allowing UEs to operate temporarily as personal femtocells for direct communication without relying on a traditional base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If device-to-device communication is implemented without base station control, then communication efficiency and direct connectivity are improved, but network control and interference management deteriorate
Solution Approach 1:
The patent segments the D2D communication process into distinct phases: discovery phase where UEs autonomously find each other using buddy lists, and connection phase where base station control is re-established for resource allocation and interference management. This segmentation allows efficient direct communication while maintaining necessary network control.
Solution Approach 2:
The base station performs preliminary actions by pre-configuring buddy lists containing candidate D2D partners before actual D2D communication occurs. This preliminary setup enables rapid direct connection establishment while the base station retains overall coordination capability.
2Speed
If continuous D2D discovery process is maintained, then connection establishment speed is improved, but power consumption and signaling overhead worsen
Solution Approach 1:
Instead of continuous discovery, the patent implements periodic discovery where the base station initiates D2D discovery processes at specific intervals based on traffic patterns and network conditions. Buddy lists are updated periodically rather than continuously, reducing power consumption while maintaining connection establishment capability.
Solution Approach 2:
UEs use pre-configured buddy lists to autonomously identify potential D2D partners without requiring continuous base station signaling. This self-service approach reduces signaling overhead and power consumption while enabling rapid connection establishment when needed.
3Adaptability or versatility
If multiple UEs operate as personal femtocells simultaneously, then network capacity and D2D connectivity are improved, but interference and resource conflict worsen
Solution Approach 1:
The base station acts as an intermediary that coordinates resource allocation among multiple UEs operating as personal femtocells. It manages uplink and downlink resource assignments to prevent conflicts and minimize interference between simultaneous D2D connections.
Solution Approach 2:
The patent implements dynamic resource allocation where the base station continuously monitors and adjusts resource assignments for D2D UEs based on current network conditions, traffic patterns, and interference levels. This dynamic approach enables multiple UEs to operate simultaneously while adapting to changing conditions.
Data Source
AI summary
An embodiment of a system enables a user equipment to employ a buddy list to initiate a D2D discovery process. The user equipment constructs a buddy list including other user equipments with which the user equipment would desire to communicate employing a D2D communication link. The user equipment transmits the buddy list to a serving base station. The user equipment transmits a request to the serving base station that it desires to communicate over a D2D communication link with a second user equipment that is on the buddy list. The user equipment receives D2D link setup information from the serving base station for the communication link with the second user equipment. The user equipment transmits a beacon signal employing the D2D link setup information.