D2D Signal Transmission via Cluster Head Resource Allocation
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Solution Overview
Problem
Current wireless communication systems, such as LTE, primarily focus on communication between a base station and user equipment, lacking efficient methods for direct device-to-device (D2D) communication between user equipment (UEs) outside network coverage.
Innovation Solution
A method and apparatus for D2D communication where a UE can request or become a cluster head to manage resource allocation for transmitting D2D signals, using preconfigured resources and reserved preamble sequences, enabling efficient signal transmission and reception between UEs outside or within network coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If D2D communication is implemented between UEs outside network coverage, then communication capability is improved, but interference management becomes more difficult
Solution Approach 1:
UEs autonomously select resources and transmit D2D signals without network coordination. The system enables self-organized D2D communication where user equipment independently manages resource allocation and interference avoidance, eliminating the need for complex network-controlled interference management in out-of-coverage scenarios
Solution Approach 2:
The available resources are divided into multiple resource pools with different properties (e.g., coverage-based resource pools). UEs select from segmented resource pools based on their coverage status, allowing differentiated resource allocation that simplifies interference management by separating in-coverage and out-of-coverage transmission characteristics
2Productivity
If resource allocation is centralized through cluster head, then resource utilization efficiency is improved, but control signaling overhead increases
Solution Approach 1:
A cluster head UE acts as an intermediary to coordinate resource allocation among multiple UEs. The cluster head receives resource selection information from member UEs and provides centralized resource assignment, improving resource utilization efficiency while reducing the need for extensive peer-to-peer negotiation signaling
Solution Approach 2:
Full centralized control is applied only within local clusters rather than across the entire network. This partial centralization achieves efficient resource utilization at the cluster level without requiring network-wide control signaling, thereby limiting signaling overhead to local scope
3Loss of time
If UEs use preconfigured resources for D2D transmission, then transmission delay is reduced, but resource collision probability increases
Solution Approach 1:
Resource pools are preconfigured and made available to UEs before D2D transmission begins. UEs can immediately select and use these pre-configured resources without waiting for network allocation or negotiation, achieving low-latency transmission while the structured resource pool design minimizes collision probability through orthogonal resource separation
Data Source
AI summary
The present invention provides a method whereby user equipment located outside network coverage or in partial network coverage performs device-to-device (D2D) communication. The user equipment, which has a D2D signal to transmit, can send a request for resource allocation for the transmission of the D2D signal to user equipment configured as a cluster head, or become a cluster head itself. The user equipment, which has the D2D signal to transmit, can transmit the D2D signal according to the resource allocation by the cluster head or resource allocation performed by becoming a cluster head itself. Other user equipment receives the D2D signal by receiving or overhearing information on the resource allocation from the cluster head.