D2D Communications Resource Scheduling via Segmented Regions
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Solution Overview
Problem
Fourth generation LTE networks face limitations in network capacity and geographical coverage, especially during high load conditions and when devices are outside network coverage, necessitating the introduction of device-to-device (D2D) communications to enable efficient data transfer without relying on network entities like base stations.
Innovation Solution
A communications device with a transmitter and receiver configured for D2D communications, utilizing a wireless access interface with a scheduling region and shared communications resources, allowing devices to reserve resources through scheduling assignment messages, thereby enabling efficient D2D communications without a central coordinating entity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If device-to-device communications are introduced to overcome network capacity and coverage limitations, then communication capability outside coverage and during high load is improved, but network complexity and coordination difficulty increase
Solution Approach 1:
The wireless access interface is divided into a scheduling region with multiple predetermined sections and shared communications resources with corresponding sections. Each section can be independently selected and reserved, allowing devices to manage resources in a segmented manner without requiring complex centralized coordination.
Solution Approach 2:
Devices autonomously select and reserve communications resources by transmitting scheduling assignment messages in the scheduling region. The system enables self-organized resource allocation where each device independently manages its own communication needs without requiring complex network coordination.
2Manufacturing precision
If scheduling assignment messages are transmitted in each section of the scheduling region to reserve resources, then resource allocation precision is improved, but power consumption increases
Solution Approach 1:
Instead of requiring devices to monitor all sections of the scheduling region continuously, the system allows devices to monitor only the sections relevant to their communication needs. This partial monitoring approach maintains sufficient resource allocation precision while significantly reducing power consumption.
Solution Approach 2:
The scheduling region is transmitted periodically rather than continuously. Devices monitor the scheduling region at periodic intervals to receive scheduling assignment messages, which maintains accurate resource allocation information while enabling power saving by allowing the device to enter low-power states between monitoring cycles.
Data Source
AI summary
A communications device includes a transmitter configured to transmit signals to one or more other communications devices via a wireless access interface, the one or more communications devices configured to perform device-to-device communications. A receiver is configured to receive signals from the one of the other communications devices via the wireless access interface, and a controller controls the transmitter and receiver to transmit or to receive the signals via the wireless access interface to transmit or to receive data represented by the signals. The wireless access interface provides a scheduling region including plural predetermined sections of communications resources, and plural sections of shared communications resources. Transmission of a scheduling assignment message in a section of the scheduling region informs other devices of a group that a communications device will transmit signals representing data in a corresponding section of the shared communications channel.