Group Coordinator D2D Group Transmission Latency Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current ProSe (LTE D2D) concepts fail to support 2-hop group transmission, lacking essential components for creating groups with cellular UL capabilities, handling identities, and performing scheduling and prioritization, which results in additional latency during dynamic scheduling procedures.
Innovation Solution
The method enhances dynamic scheduling by using a group coordinator to receive data via D2D grants and transmit it to the base station at a predetermined time offset, integrating UL transmissions into sidelink resource assignment to reduce latency and improve resource efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current ProSe (LTE D2D) concepts are used for group transmission, then device-to-device communication is enabled, but 2-hop group transmission is not supported and additional latency occurs during dynamic scheduling procedures
Solution Approach 1:
The base station performs preliminary resource assignment for both sidelink and uplink transmissions before the actual data transmission. The group coordinator receives configured grants in advance that specify both sidelink resources (for receiving data from group members) and uplink resources (for transmitting to the base station), eliminating the need for dynamic scheduling requests and reducing latency.
Solution Approach 2:
A group coordinator device is introduced as an intermediary within the group. This coordinator receives data from all group members via sidelink and consolidates it for uplink transmission to the base station. This intermediary structure enables efficient 2-hop group transmission by centralizing the coordination function and reducing individual scheduling overhead for each device.
2Productivity
If separate resource assignment for sidelink and uplink is performed, then resource allocation is possible, but resource utilization efficiency decreases due to additional signaling
Solution Approach 1:
The resource assignment for sidelink and uplink transmissions is merged into a single configured grant configuration. The base station provides a unified resource allocation that specifies both the sidelink resources (time-frequency resources for group members to transmit to the coordinator) and the uplink resources (time-frequency resources for the coordinator to transmit to the base station), eliminating the need for separate signaling procedures and reducing overall signaling overhead.
Data Source
AI summary
A method for enabling group transmission in a telecommunication network including a group having plurality of devices capable of Device to Device, D2D, communication and a base station. The group has a group coordinator device and the plurality of devices may directly communicate with one another over a D2D side-links. The group coordinator device communicates with the base station over a cellular link. The method includes receiving, by the group coordinator, data from a device of the group utilizing a D2D grant for performing D2D communications within the group. The D2D grant has a D2D time resource indicating a D2D time resource in which the D2D communications are allowed, transmitting, by the group coordinator, the received data to the base station at an uplink, time resource. The uplink time resource is determined by adding a fixed, predetermined, time offset to D2D time resource in the grant.