Sidelink Feedback Channel Selection for Carrier Aggregation
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Solution Overview
Problem
Conventional sidelink communication systems face challenges in feeding back multiple response information (HARQ-ACK) within a single physical sidelink feedback channel (PSFCH format 0), limiting the efficiency of sidelink communication, especially in carrier aggregation scenarios where multiple cells are used.
Innovation Solution
A communication device is configured with a reception unit for sidelink communication, a transmission unit for transmitting first and second sidelink feedback channels, and a control unit that selects and transmits these channels to manage multiple response information, allowing for simultaneous transmission of SL-HARQ-ACK in carrier aggregation scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single PSFCH format 0 is used for feedback, then the channel structure is simple, but multiple response information (HARQ-ACK) cannot be fed back simultaneously
Solution Approach 1:
The feedback channel is segmented into multiple types (PSFCH format 0 and PSFCH format 1) with different capabilities. PSFCH format 0 handles single response information with simple structure, while PSFCH format 1 handles multiple response information. The terminal device selects the appropriate format based on the number of HARQ-ACK bits to feed back, resolving the contradiction by dividing the feedback function into specialized segments.
Solution Approach 2:
The feedback channel format is made dynamic and adaptable. The terminal device dynamically selects between PSFCH format 0 and PSFCH format 1 based on the number of response information that needs to be fed back. This dynamic adaptation allows the system to maintain simple structure when only one response is needed while enabling multiple responses when necessary, without requiring a permanently complex channel structure.
2Productivity
If carrier aggregation is introduced to increase communication speed, then bandwidth is extended, but feedback of multiple SL-HARQ-ACK becomes problematic
Solution Approach 1:
The feedback mechanism is segmented into two formats with different capabilities. PSFCH format 0 is used for single HARQ-ACK feedback maintaining simplicity and reliability, while PSFCH format 1 is specifically designed for carrier aggregation scenarios where multiple HARQ-ACK bits need to be fed back. This segmentation ensures that carrier aggregation can be implemented without compromising feedback reliability.
Solution Approach 2:
The system changes the feedback channel parameters (format type) based on the carrier aggregation configuration. When carrier aggregation is active and multiple HARQ-ACK bits need feedback, the system switches to PSFCH format 1 which supports multiple bits. This parameter change allows the system to maintain reliability across different operational modes including carrier aggregation.
Data Source
AI summary
Feedback of a plurality of pieces of SL-HARQ-ACK in sidelink communication is controlled. A communication device (terminal device 2) includes a reception unit (205), a transmission unit (207), and a control unit (203). The reception unit (205) receives a sidelink shared channel for sidelink communication that is device-to-device communication. The transmission unit (207) transmits a first sidelink feedback channel and a second sidelink feedback channel for transmitting response information of the sidelink shared channel. The control unit (203) performs control to select the first sidelink feedback channel and the second sidelink feedback channel, and to cause the transmission unit to transmit the selected result.