Two-Step D2D Discovery Using Multicast Subframes
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Solution Overview
Problem
Conventional D2D communication methods, such as the Over-The-Top (OTT) scheme, face challenges in efficiently managing network resources and power consumption due to the need for frequent location updates and service discovery processes, especially in scenarios with a large number of UEs or extensive discovery ranges, which complicates supporting D2D communication services.
Innovation Solution
A method involving UEs acquiring and broadcasting a discovery code and multicast ID through D2D multicast subframes, allowing for a two-step discovery process where small-size discovery information is transmitted first, followed by additional information in a multicast subframe, enabling resource reuse and power savings by only receiving additional information when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the OTT scheme is used for service discovery in D2D communication, then UEs can discover adjacent UEs and exchange information, but network resources are consumed frequently due to periodic location updates and server communications
Solution Approach 1:
The patent segments the service discovery process into two distinct phases: a first phase using OTT scheme for initial discovery, and a second phase using D2D direct communication for continued interaction. This segmentation allows UEs to switch from network-dependent discovery to autonomous peer-to-peer communication, reducing ongoing network resource consumption and power usage while maintaining reliable service discovery capability.
2Reliability
If the OTT scheme is used for service discovery, then UEs can find relevant services, but a significant amount of power is consumed due to additional GPS or WLAN modules for location recognition
Solution Approach 1:
The patent enables UEs to self-determine their location and service availability using only their cellular communication capabilities. By utilizing cell ID information and signal strength measurements that are already available for basic cellular operation, UEs can perform location recognition without requiring additional GPS or WLAN hardware, thus reducing device complexity while maintaining reliable location-based service discovery.
3Adaptability or versatility
If the OTT scheme is used for D2D communication support, then service discovery can be performed, but supporting a large number of UEs or large discovery range is difficult due to non-licensed band limitations
Solution Approach 1:
The patent merges the OTT discovery mechanism with D2D direct communication in the licensed band. By combining the service discovery functionality of OTT with the resource-efficient D2D communication capability, the system can support a large number of UEs and extensive discovery ranges using licensed band resources, thereby increasing adaptability while reducing consumption of network resources.
Data Source
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AI summary
The present invention relates to a two-step search procedure for D2D communication. A method for D2D communication includes: obtaining a discovery code and a multicast identifier to be used for transmitting additional information on an application program through a D2D multicast subframe, based on an identifier of an application program of a device; and broadcasting the discovery code and the multicast identifier in a discovery subframe.