D2D Peer Discovery Resource Selection via Base Station Coordination
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Solution Overview
Problem
In device-to-device (D2D) communication systems, the existing peer discovery resource (PDR) selection methods lead to discovery message collisions and increased delays due to devices selecting the same PDR, especially in densely populated areas, resulting in reduced discovery performance and unnecessary message transmissions.
Innovation Solution
A method and apparatus that restrict the PDR selecting range to a PDR group unit, allowing devices to select a unique PDR group based on their identifier or randomly, and extend the selecting range if duplication occurs, while considering energy levels and usage to prevent collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If devices select PDR individually based on energy level, then device autonomy is improved, but PDR collision increases in densely populated areas
Solution Approach 1:
The patent introduces a base station as an intermediary that coordinates PDR selection among devices. The base station receives PDR selection information from multiple devices and manages resource allocation to prevent collisions, thereby maintaining device autonomy while improving discovery performance through centralized coordination.
2Device complexity
If devices select from limited PDR options, then resource allocation is simplified, but PDR collision increases
Solution Approach 1:
The patent segments the PDR selection process into two stages: devices first select from a limited set of PDR options (simplifying individual device complexity), then the base station segments the resource allocation by assigning specific PDRs to specific devices based on their selections, thereby preventing collisions while maintaining simplicity.
3Speed
If devices transmit discovery messages simultaneously, then discovery speed is improved, but message collision increases
Solution Approach 1:
The patent implements preliminary action by having devices report their intended PDR selections to the base station before actually transmitting discovery messages. The base station processes these selections and assigns collision-free PDRs in advance, allowing devices to transmit simultaneously without message collisions.
4Reliability
If PDR selection range is restricted to PDR group unit, then unique PDR assignment is improved, but selection flexibility is reduced
Solution Approach 1:
The patent applies dynamics by making the PDR selection range adaptive. Devices initially select from a restricted PDR group (ensuring unique assignment), but the base station dynamically adjusts and expands the selection range based on collision detection and device density, thereby maintaining both unique assignment and selection flexibility.
Data Source
AI summary
The present disclosure relates to a pre-5th-generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th-generation (4G) communication system such as a long term evolution (LTE). The present invention relates to a method for selecting, by a device, a peer discovery resource (PDR) in a device-to-device (D2D) communication system, the method comprising the steps of: determining a PDR selection range which can be selected by the device; and selecting a PDR in the determined PDR selection range.