D2D Scheduling Grants for Data Overriding and Reliable Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing D2D communication systems lack detailed scheduling and control information signaling, leading to inefficient resource allocation and potential interference issues, particularly in licensed bands.
Innovation Solution
A method and apparatus for D2D communication that includes generating and transmitting D2D scheduling assignment (D2D SA) and data grants, enabling flexible scheduling and data overriding through separate grants, allowing for efficient resource utilization and improved communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If D2D communication uses unlicensed band (WLAN, Bluetooth), then device-to-device communication capability is enabled, but service control capability is poor and performance is significantly degraded due to interference
Solution Approach 1:
The eNB acts as an intermediary that provides centralized scheduling and control for D2D communication. The base station allocates resources, manages interference, and coordinates transmissions between UEs, thereby maintaining reliable service quality while enabling D2D communication capabilities.
2Reliability
If D2D communication uses licensed band with eNB resource allocation, then service quality and frequency use efficiency are improved, but detailed scheduling and control information signaling have not been developed
Solution Approach 1:
The control signaling is segmented into different types: scheduling assignments for resource allocation, HARQ acknowledgments for error control, and data grants for transmission authorization. This segmentation allows each signaling element to be optimized independently, reducing overall complexity while maintaining high service quality.
Solution Approach 2:
The eNB performs preliminary scheduling and resource allocation before D2D transmission occurs. By pre-assigning resources and providing scheduling assignments in advance, the system reduces the complexity of real-time control decisions and enables efficient D2D communication with manageable signaling overhead.
3Ease of manufacture
If D2D communication transmits data without detailed scheduling, then implementation is simpler, but resource allocation is inefficient and interference issues occur
Solution Approach 1:
UEs autonomously perform HARQ operations, including transmitting acknowledgments and retransmitting data when needed. This self-service mechanism simplifies the overall system implementation by reducing the need for complex centralized control while maintaining efficient resource utilization through distributed intelligence.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A method by a base station (900) for transmitting a device-to-device, D2D, scheduling assignment, SA, grant and a D2D data grant, the method comprising: transmitting the D2D SA grant to a first wireless device (930), the D2D SA grant enabling the first wireless device to transmit an SA to a second wireless device (960) through a D2D communication; transmitting the D2D data grant to the first wireless device, the D2D data grant enabling the first wireless device to transmit a first transport block to the second wireless device in a time period comprising multiple transmission opportunities, MTOs; generating a second grant for indicating that a scheduled transmission of the first transport block is replaced with a scheduled transmission of a second transport block from a time point in the time period; and transmitting the generated second grant to the first wireless device..