Sidelink Feedback Interference Management via Yielding
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Solution Overview
Problem
Current wireless communication systems face challenges in managing interference between feedback transmissions over sidelinks, leading to increased retransmissions due to corrupted feedbacks, which affects resource utilization efficiency.
Innovation Solution
The proposed solution involves prioritizing sidelink communications and implementing interference management techniques where low-priority receivers determine whether to yield based on the interference tolerance level of priority transmitters and the interference level from low-priority receivers to priority transmitters, thereby reducing retransmissions and improving resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If medium-sensing procedures (RTS-CTS) are employed for sidelink resource sharing, then data transmission protection is improved, but feedback transmission interference management deteriorates
Solution Approach 1:
The patent segments the sidelink communication into two distinct directions: forward link (data transmission from transmitter to receiver) and reverse link (feedback transmission from receiver to transmitter). This segmentation allows separate interference management strategies for each direction, where the forward link uses traditional RTS-CTS protection while the reverse link implements a yielding mechanism based on interference tolerance levels, thereby resolving the contradiction between data protection and feedback interference management.
Solution Approach 2:
The patent applies preliminary action by having the low-priority receiver determine whether to yield before transmitting feedback. The receiver calculates the interference level that would be caused to the priority transmitter and compares it against the priority transmitter's interference tolerance level. This preliminary determination prevents feedback interference before it occurs, rather than attempting to manage it after the fact.
2Productivity
If multiple pairs of UEs share sidelink resources simultaneously, then resource utilization efficiency is improved, but feedback corruption increases
Solution Approach 1:
The patent changes the parameter of interference management from a binary approach (yield or not yield) to a quantitative approach based on interference tolerance levels. The priority transmitter communicates its interference tolerance level to the priority receiver, which then uses this parameter to make informed decisions about feedback transmission. This allows multiple UE pairs to share resources more efficiently while maintaining feedback reliability by dynamically adjusting based on channel conditions and interference tolerance.
3Speed
If low-priority receivers transmit feedback without yielding, then feedback transmission speed is improved, but interference to priority transmitters increases
Solution Approach 1:
The patent applies local quality by making the yielding decision specific to each receiver-transmitter pair rather than applying a global yielding rule. Each low-priority receiver independently determines whether to yield based on the specific interference tolerance level of the priority transmitter and the specific interference level that would be caused. This localized decision-making allows feedback transmission to proceed when interference is acceptable while preventing interference when tolerance is exceeded.
Data Source
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AI summary
Wireless communications systems and methods related to managing interference among feedback transmissions are provided. A first wireless communication device receives, from a second wireless communication device, a first forward data transmission request signal over a first link in a first link direction, wherein the first forward data transmission request signal is associated with a first feedback transmission over the first link in a second link direction opposite the first link direction. The first wireless communication device yields, in response to the first forward data transmission request signal, access to a channel resource for the first feedback transmission based on at least an interference tolerance level of the second wireless communication device and an interference level on the first feedback transmission from the first wireless communication device.