Sidelink Feedback Channel Contiguity for Interference Reduction
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Solution Overview
Problem
When a terminal simultaneously transmits multiple HARQ-ACKs via multiple PSFCHs with non-contiguous resources in the frequency domain, the transmission capability decreases due to increased interference, leading to a need for Maximum Power Reduction (MPR) settings that can degrade performance further.
Innovation Solution
A terminal is configured with a control unit that selects the upper limit number of sidelink feedback channels to be simultaneously transmitted, ensuring that only contiguous resources in the frequency domain are used for transmission, thereby mitigating interference and maintaining transmission capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple non-contiguous PSFCH resources are used for simultaneous HARQ-ACK transmissions, then the number of feedback channels increases, but transmission capability decreases due to increased interference and larger MPR values
Solution Approach 1:
The patent changes the parameter of resource contiguity from non-contiguous to contiguous in the frequency domain. By selecting PSFCH resources that are contiguous rather than non-contiguous, the system reduces interference between simultaneous transmissions and avoids large MPR values, thereby maintaining transmission capability while still allowing multiple feedback channels to be transmitted simultaneously
2Productivity
If multiple non-contiguous PSFCH resources are used for simultaneous transmissions, then more feedback can be sent, but interference on other frequency bands increases
Solution Approach 1:
The patent changes the spatial arrangement parameter of PSFCH resources from non-contiguous to contiguous in the frequency domain. This contiguous allocation reduces spectral fragmentation and minimizes interference spill-over to adjacent frequency bands, thereby maintaining high feedback transmission efficiency while reducing harmful interference effects
Data Source
AI summary
A terminal includes a receiving unit that performs reception on at least one of a plurality of sidelink control channels or a plurality of sidelink shared channels; a control unit that selects, upon detecting that a number of a plurality of sidelink feedback channels to be simultaneously transmitted exceeds an upper limit number, the upper limit number of sidelink feedback channels from among the plurality of sidelink feedback channels to be simultaneously transmitted, wherein each of the feedback channels is associated with at least one of a control channel of the plurality of sidelink control channels or a shared channel of the plurality of sidelink shared channel; and a transmitting unit that performs simultaneous transmissions on the selected upper limit number of sidelink feedback channels.