Cellular-Assisted D2D Discovery Resource Allocation
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Solution Overview
Problem
Device-to-device (D2D) communication in wireless networks faces limitations in discovery range and reliability due to unfavorable channel conditions and the absence of a central intermediary to resolve collisions during device discovery.
Innovation Solution
A method involving the broadcasting of D2D discovery system information (D2D-SIB) from base stations to D2D-capable user equipments (D2D-UEs), which indicates frames/subframes for transmitting and monitoring D2D discovery request and response signals, using paired time-multiplexed resource blocks within the cellular uplink resources, allowing authorized D2D-UEs to transmit and unauthorized ones to listen, thereby improving discovery efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D devices perform direct communication without cellular network assistance, then communication overhead is reduced and spectral efficiency is improved, but discovery range is limited and collision resolution capability is lost
Solution Approach 1:
The base station serves as an intermediary that provides discovery assistance information to D2D devices. The base station broadcasts system information blocks (SIBs) containing resource allocation patterns, frame structures, and other discovery parameters, enabling devices to perform D2D discovery without direct network involvement in the actual discovery process, thus maintaining spectral efficiency while extending discovery capability through network-provided guidance
2Device complexity
If D2D devices operate autonomously without central coordination, then device complexity is reduced, but collision resolution during discovery becomes difficult
Solution Approach 1:
The base station performs preliminary actions by pre-configuring and broadcasting discovery resource allocation patterns, frame structures, and timing information before D2D devices begin their discovery process. This preliminary network assistance provides a coordinated framework that prevents collisions without requiring complex real-time negotiation between devices, maintaining low device complexity while ensuring reliable collision avoidance
3Adaptability or versatility
If D2D devices use low antenna positions for direct communication, then device portability is improved, but channel conditions deteriorate and discovery reliability decreases
Solution Approach 1:
The base station acts as a mediator that compensates for poor direct device-to-device channel conditions. By providing discovery assistance information including resource allocation, timing synchronization, and power control parameters, the base station enables reliable D2D discovery even when devices have unfavorable antenna positions, allowing portable devices to maintain discovery reliability without sacrificing portability
Data Source
AI summary
A method is disclosed for use in device-to-device (D2D) discovery in a wireless communication network. The network includes at least one base station and a plurality of D2D capable user equipments (D2D-UEs). The network also supports cellular communication and direct communication between D2D-UEs. The method includes transmitting D2D discovery system information (D2D-SIB) from the base station to D2D-UEs, wherein the D2D-SIB indicates frame(s)/subframe(s) for D2D-UEs to transmit D2D discovery request signal(s) and frame(s)/subframe(s) for D2D-UEs to transmit D2D discovery response signal(s). The method also includes transmitting one or more D2D discovery request signal(s) from one D2D-UE, and upon receipt of a said D2D discovery request signal by another D2D-UE, transmitting from said other D2D-UE one or more D2D discovery response signal(s). The D2D discovery request signal(s) and D2D discovery response signal(s) are transmitted on the frame(s)/subframe(s) indicated in the D2D-SIB.