Sidelink Control Information Repetition for Decoding Reliability
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Solution Overview
Problem
In device-to-device (D2D) communications, the receiving UE may fail to receive data due to incomplete decoding of control information, as it cannot identify the resource for data transmission, leading to inefficiencies in data reception.
Innovation Solution
A method where the transmitting UE generates and repeatedly transmits control information and data, ensuring the transmission interval between the last control information and initial data is sufficient for decoding, with parameters like the number of repeated transmissions and redundancy versions being included in the control information, allowing the receiving UE to identify and receive the data correctly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If control information is transmitted once before data transmission, then the transmission delay is reduced, but the receiving UE may fail to decode the control information completely and cannot identify the data transmission resource
Solution Approach 1:
The transmitting UE performs preliminary action by repeatedly transmitting control information before data transmission. This ensures the receiving UE has sufficient time and multiple opportunities to decode the control information completely, including identifying the data transmission resource, before the actual data arrives. The repetition of control information transmission is a preliminary action that prevents decoding failures.
Solution Approach 2:
The control information is transmitted periodically or repeatedly at specific intervals before data transmission. This periodic repetition allows the receiving UE to capture and decode the control information reliably, ensuring the data resource identification is successful. The periodic transmission pattern balances the need for reliable decoding with efficient use of transmission resources.
2Reliability
If control information is repeatedly transmitted, then the decoding reliability is improved, but the transmission overhead increases
Solution Approach 1:
Instead of transmitting control information excessively or continuously, the patent applies partial action by transmitting it a specific number of times or for a specific duration before data transmission. This controlled repetition provides sufficient reliability for decoding while avoiding excessive transmission overhead. The transmission is performed just enough times to ensure reliable reception.
Solution Approach 2:
The transmitting UE adjusts parameters such as the number of control information repetitions, transmission power, and timing intervals based on channel conditions and service requirements. By dynamically changing these parameters, the system achieves reliable control information decoding while minimizing transmission overhead. Parameter adaptation allows optimization between reliability and overhead.
Data Source
AI summary
Disclosed are operation methods of communication node supporting direct communications in network. The operation method may comprise generating control information which includes parameters used for transmitting and receiving data; transmitting, to a second UE, the control information through a physical sidelink control channel (PSCCH); and transmitting, to the second UE, the data through a physical sidelink shared channel (PSSCH) based on the parameters. Therefore, a performance of the network can be enhanced.