D2D Communication Scheduling Reliability via Implicit Control Information
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Solution Overview
Problem
Device-to-device (D2D) communication in radio communications networks faces inefficiencies due to the need for multiple scheduling assignments and increased radio resource load, which can lead to performance degradation, especially for traffic types that do not support retransmissions.
Innovation Solution
The method involves multiplexing control information with data transmissions and using transmission parameters to implicitly indicate subsequent transmission patterns, reducing the need for redundant scheduling assignments and optimizing radio resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple scheduling assignments are used for D2D communication, then scheduling reliability is improved, but signaling load and radio resource usage increase
Solution Approach 1:
The patent extracts the essential scheduling information from multiple separate scheduling assignments and consolidates it into a single scheduling assignment. The transmitter receives a single SA that contains parameters enabling the device to determine multiple transmission patterns, thereby removing the need for multiple redundant SAs while maintaining scheduling reliability.
Solution Approach 2:
The single scheduling assignment is designed to serve multiple functions: it provides scheduling information for the current transmission and contains parameters that enable determination of subsequent transmission patterns. This multi-functional SA reduces signaling load while maintaining comprehensive control over D2D communication sequences.
2Reliability
If multiple scheduling assignments are used for D2D communication, then scheduling reliability is improved, but radio resource usage increases
Solution Approach 1:
The patent merges the information from multiple scheduling assignments into a single consolidated SA. By combining scheduling parameters, transmission pattern indicators, and resource allocation information into one message, the system reduces the number of radio resources consumed while ensuring reliable scheduling control for D2D communications.
3Reliability
If redundant scheduling assignments are transmitted, then scheduling reliability is improved, but transmission efficiency decreases
Solution Approach 1:
The single scheduling assignment includes preliminary parameters and indicators that enable the receiver to determine subsequent transmission patterns without requiring additional SAs. This preliminary information provision eliminates the need for redundant scheduling messages, thereby improving transmission efficiency while maintaining scheduling reliability.
Data Source
AI summary
Embodiments herein relate to e.g. methods performed in first and second communication devices(10, 13) for enabling device to device communication between the first communication device (10) and the second communication device (13) in a radio communications network (1). The first communication device (10) transmits data in a first data transmission to the second communication device (13) according to a first transmission pattern. The first communication device (10) also transmits control information with the data to the second communication device (13),which control information indicates a second transmission pattern for a next data transmission from the first communication device (10) to the second communication device (13).The second communication device (13) receives the control information with the data in the first transmission. Further embodiments relate to the first and second communication devices (10, 13).