D2D Broadcast Communication Outside Network Coverage
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Solution Overview
Problem
Current technologies lack a solution for implementing Device-to-Device (D2D) broadcast communication outside a network coverage area, specifically in scenarios where network dependency is high, such as public security communications.
Innovation Solution
The implementation of D2D broadcast communication is achieved through centralized and distributed methods, where data is broadcast on a shared channel via a central node or resource competition, allowing communication to occur independently of the network in network coverage-free areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If D2D broadcast communication is implemented outside network coverage area, then network dependency is reduced and communication independence is improved, but there is no existing solution in the related art for resource allocation and control plane management
Solution Approach 1:
The patent enables D2D UEs to autonomously perform control plane processes and resource allocation without network management when outside coverage area. The source D2D UE self-selects broadcast resources from pre-configured pools and autonomously manages the broadcast communication, eliminating dependency on network control while maintaining communication functionality.
Solution Approach 2:
The patent pre-configures multiple broadcast resources (physical uplink resources, modulation and coding schemes, transport block sizes) in the UE before the UE enters coverage-free area. When network coverage is lost, the UE can immediately utilize these pre-configured resources without requiring real-time network allocation, ensuring continuous communication capability.
2Ease of operation
If centralized broadcast method is used via central node, then resource allocation is simplified and control is improved, but a central node must be selected and maintained among D2D UEs
Solution Approach 1:
The patent introduces a central node (relay UE or gateway UE) that mediates resource allocation for D2D broadcast in coverage-free area. The central node coordinates resource selection and manages broadcast communications among multiple source and destination UEs, simplifying the overall system operation while distributing control responsibilities.
Solution Approach 2:
The patent combines the functions of multiple D2D UEs into a centralized control structure where one UE acts as a central node for resource management. This merging of control functions reduces the complexity of distributed coordination among all UEs while maintaining efficient resource allocation through a single coordinating entity.
3Adaptability or versatility
If distributed broadcast method is used via resource competition, then autonomy is improved and central node dependency is reduced, but resource conflicts and interference may occur
Solution Approach 1:
The patent provides multiple pre-configured broadcast resources (excessive resources) for D2D UEs to choose from. By providing more resources than strictly necessary, the system reduces the probability of resource conflicts in distributed mode while maintaining autonomy, as UEs have multiple alternative resources available for selection.
Solution Approach 2:
The patent implements feedback mechanisms where D2D UEs monitor resource usage and communication quality in the distributed broadcast mode. Based on feedback about resource conflicts or interference, UEs can dynamically adjust their resource selection or switch to alternative pre-configured resources, improving communication reliability while maintaining autonomous operation.
Data Source
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AI summary
Disclosed are a device-to-device broadcast communication method and a user equipment. The method comprises: performing device-to-device (D2D) broadcast communication outside a coverage area of a network in a centralized manner, and broadcasting data on a shared channel via a centre node; alternatively, performing the device-to-device (D2D) broadcast communication outside the coverage area of the network in a distributed manner, and broadcasting data on a shared channel via resource competition.