D2D Scheduling Assignment Information for Autonomous Resource Selection
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Solution Overview
Problem
In Device to Device (D2D) communication, D2D devices operating in mode 2 face conflicts due to the lack of resource usage information, leading to simultaneous data transmission on the same resource, which causes conflicts.
Innovation Solution
A method where a first D2D device generates and transmits a data packet with Scheduling Assignment (SA) information, including the period and other details of its SPS/SPT service, to a second D2D device, enabling the second device to learn about the resource usage conditions, thus avoiding conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If D2D devices autonomously select resources in mode 2, then device autonomy and flexibility are improved, but resource conflicts occur due to lack of resource usage information
Solution Approach 1:
The patent implements a feedback mechanism where D2D devices broadcast Scheduling Assignment (SA) information containing SPS/SPT service period details to other D2D devices. This feedback loop enables autonomous devices to learn about resource usage conditions of other devices, allowing them to make informed resource selection decisions that avoid conflicts while maintaining autonomy.
2Reliability
If base station allocates resources in mode 1, then resource conflict is avoided through centralized control, but device autonomy and flexibility are reduced
Solution Approach 1:
The patent enables D2D devices to self-service by autonomously selecting resources based on SA information they acquire from other devices. Instead of relying on base station allocation, devices independently make resource selection decisions using the periodic information about other devices' SPS/SPT services, thus achieving both conflict avoidance and device autonomy.
3Loss of information
If SPS/SPT service period information is broadcast in SA information, then resource usage awareness is improved, but communication overhead increases
Solution Approach 1:
The patent applies local quality by selectively including only the essential SPS/SPT service period information in the SA broadcasts rather than transmitting complete resource usage details. This selective information inclusion provides sufficient awareness for autonomous resource selection while minimizing the communication overhead added to each SA transmission.
Data Source
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AI summary
Disclosed are a device-to-device (D2D) communication method and a D2D device, the method comprising: a first D2D device generates a data packet, the data packet being a semi-persistent scheduling (SPS/SPT) service data packet, the data packet comprising first scheduling assignment (SA) information, the first SA information comprising SPS/SPT service cycle information; the first D2D device sends the data packet to a second D2D device. The first D2D device carries the SPS/SPT service cycle information in the SA information so that the second D2D device learns a resource usage situation in order to implement SPS/SPT service transmission with autonomous resource selection by the second D2D device, thereby preventing a plurality of D2D devices from simultaneously transmitting SPS/SPT service data on the same resources and thus producing conflicts.