Sidelink Feedback Resource Reservation in Unlicensed Spectrum
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In sidelink communication systems using unlicensed spectrum, timely feedback of important messages is hindered by channel contention failures, leading to potential loss of data and increased power consumption due to blind detection of time-frequency resources.
Innovation Solution
A communication method and apparatus that utilize control information formats to reserve specific time-frequency resources for message feedback, ensuring timely and successful transmission of messages by indicating formats for redundancy versions and transmission information, thereby reducing the need for blind detection and channel contention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If channel contention is performed on unlicensed spectrum, then spectrum utilization is improved, but feedback timeliness deteriorates when contention fails
Solution Approach 1:
The transmitting device performs preliminary action by reserving the feedback resource in advance through the first control information before the actual feedback transmission occurs. This reservation mechanism ensures that when the receiving device needs to send feedback, the resource is already prepared and assigned, eliminating the need for additional contention and ensuring timely feedback delivery.
2Productivity
If channel contention is performed on unlicensed spectrum, then spectrum access is improved, but power consumption increases
Solution Approach 1:
The invention extracts the feedback transmission requirement from the general channel contention process. By separating the feedback resource reservation (through first control information) from the actual feedback transmission, the system eliminates the need for the receiving device to engage in channel contention for feedback, thereby reducing power consumption while maintaining spectrum access efficiency.
3Adaptability or versatility
If blind detection is performed for feedback resources, then resource allocation flexibility is improved, but detection complexity increases
Solution Approach 1:
The system implements a feedback mechanism where the transmitting device sends first control information that includes reservation information for the feedback resource. The receiving device uses this feedback information to determine the exact resource for feedback transmission, eliminating the need for blind detection and reducing detection complexity while maintaining resource allocation flexibility through the control information formatting.
Data Source
AI summary
A first device sends first control information and second control information to a second device. At least one of a first field or a second field in the first control information indicates a format of the first control information and a format of the second control information. A first format of the first control information indicates a time-frequency resource for feeding back a specified message by the second device. A third format of the second control information indicates a redundancy version of the specified message fed back by the second device. When the first control information is in the first format and the second control information is in the third format, the first device receives, on the time-frequency resource, the specified message fed back by the second device.