Scheduling Indication for Unlicensed Spectrum Data Transmission
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Solution Overview
Problem
In wireless communications, especially when using unlicensed spectrum resources, there is a power loss and wastage of wireless communications resources due to the inefficiencies in uplink data transmission scheduling, where the scheduled node cannot always occupy the channel as intended, leading to misunderstandings about channel availability and reduced transmission efficiency.
Innovation Solution
A data transmission method where a scheduling node sends a scheduling indication to a scheduled node for a preset spectrum resource, allowing the node to determine if it can transmit data in a subsequent time interval based on channel availability, thereby optimizing channel occupation and reducing power loss and resource wastage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the scheduled node continuously occupies the channel by sending random data to ensure channel availability, then the channel occupation is guaranteed, but power loss and wireless communications resource wastage occur
Solution Approach 1:
The scheduled node performs preliminary channel sensing (Listen-Before-Talk) before data transmission to determine channel availability. This preliminary action prevents unnecessary power consumption by avoiding transmission when the channel is occupied, while still ensuring reliable channel occupation when available.
Solution Approach 2:
The scheduling node provides feedback to the scheduled node about channel availability and transmission authorization. This feedback mechanism allows the scheduled node to adjust its transmission behavior dynamically, occupying the channel only when authorized and available, thereby preventing power waste while maintaining reliable communication.
2Reliability
If the scheduled node continuously occupies the channel by sending random data, then the channel availability is ensured, but wireless communications resource wastage occurs
Solution Approach 1:
The system performs preliminary channel sensing and authorization before data transmission. This ensures that transmission resources are only used when the channel is available and authorized, preventing resource wastage while maintaining channel availability for legitimate transmissions.
Solution Approach 2:
The scheduled node autonomously senses the channel and determines whether to transmit based on channel availability and received authorization. This self-service approach eliminates the need for continuous random data transmission to maintain channel occupation, thereby improving transmission efficiency while ensuring channel availability when needed.
3Ease of operation
If the scheduling node receives and stores data without determining whether it was actually sent by the scheduled node, then data reception is simplified, but incorrect data reception and storage occur
Solution Approach 1:
The scheduled node sends feedback information to the scheduling node to confirm whether data transmission was actually performed. The scheduling node uses this feedback to determine whether to store the received data, ensuring accurate data reception and storage while maintaining operational simplicity through a structured feedback mechanism.
Solution Approach 2:
The scheduling node performs preliminary determination based on feedback information before storing received data. This preliminary action prevents incorrect data storage by verifying that the received data was actually transmitted by the scheduled node, thereby improving data reception accuracy without significantly complicating the reception process.
Data Source
AI summary
A scheduling node sends, in a first TTI to a scheduled node, a scheduling indication of transmitting data by using a preset spectrum resource. After the scheduled node receives the scheduling indication, when it is determined that data can be transmitted in the second TTI according to the scheduling indication, data is transmitted. When the scheduling node determines that the scheduled node can transmit data in the second TTI, it is determined that the data that is transmitted in the second TTI by using the preset spectrum resource is data sent by the scheduled node.