D2D Discovery via Pre-configured Periodic Resources
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current cellular communication systems face inefficiencies in device discovery between User Equipments (UEs) in Device-to-Device (D2D) communication, particularly when UEs are in close proximity, leading to suboptimal spectrum resource usage and increased data transmission pressure on the core network.
Innovation Solution
A method for D2D device discovery using a Physical ProSe Discovery Channel (PPDCH) with dedicated radio resources, where UEs receive configuration information for sending and detecting discovery signals, allowing for periodic and synchronized transmission even in scenarios without network coverage, thereby facilitating mutual discovery between UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If D2D discovery is implemented without network coverage, then device discovery capability is improved, but resource allocation control becomes more difficult
Solution Approach 1:
The network side device pre-configures discovery resources and sends configuration information to UEs before D2D discovery occurs. This preliminary resource allocation enables UEs to perform discovery autonomously without real-time network control, resolving the contradiction between improved discovery capability and simplified resource control.
2Reliability
If periodic discovery signal transmission is implemented, then discovery reliability is improved, but spectrum resource consumption increases
Solution Approach 1:
The patent implements periodic transmission of discovery signals at predetermined intervals rather than continuous transmission. This periodic action ensures reliable discovery while significantly reducing spectrum resource consumption compared to continuous signaling, directly resolving the identified contradiction.
3Productivity
If centralized network control is used for D2D discovery, then resource allocation efficiency is improved, but system complexity increases
Solution Approach 1:
The patent extracts the complex real-time control functions from the network side and transfers them to UEs through pre-configured autonomous operation. The network only performs initial resource configuration, while UEs independently manage discovery signal transmission and detection, reducing overall system complexity while maintaining resource allocation efficiency.
Data Source
Figure 1(a)~1(b)
Figure 2~3
Figure 4~5
AI summary
A device discovery method, a user equipment and a network side device are disclosed, which relates to the field of wireless communication. The method disclosed in the embodiments of the present invention includes: the user equipment acquiring device discovery configuration information, the device discovery configuration information at least including information used for indicating a time domain location of a device discovery radio resource; the user equipment determining a radio resource location for sending a D2D discovery signal according to the device discovery configuration information; and the user equipment sending the D2D discovery signal at the determined radio resource location; wherein, the device discovery radio resource indicated by the device discovery configuration information is a D2D dedicated resource, and has a specific configuration period in a time domain. The embodiments of the present invention also disclose a user equipment and a network side device. Through the technical scheme of the present invention, the discovery problem of the D2D communication system can be solved, and it is compatible that a UE in an idle state and a UE in a connected state perform D2D discovery.