Sidelink CSI Reporting via Source UE Filtering
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Solution Overview
Problem
In wireless communication systems, especially in device-to-device communication, excessive network traffic and inefficient resource utilization occur due to all target UEs attempting to report channel state information (CSI) in response to CSI reference signals (RS) from multiple source UEs.
Innovation Solution
A target UE determines a set of source UEs for which to provide CSI reporting at an upper layer and, at a lower layer, detects CSI RSs from these source UEs. The target UE then transmits a CSI report in a media access control (MAC) control element as a response, prioritizing the transmission above a sidelink transport channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all target UEs report CSI in response to CSI RS from multiple source UEs, then complete channel state information coverage is achieved, but excessive network traffic and inefficient resource utilization occur
Solution Approach 1:
The patent extracts and filters out only the necessary CSI reports by having target UEs determine a set of source UEs for which to provide reporting. This selective extraction reduces the total number of CSI reports transmitted while maintaining coverage for relevant source UEs, directly resolving the contradiction between complete coverage and excessive traffic.
Solution Approach 2:
The patent segments the CSI reporting process by dividing target UEs into different sets based on their determined source UE lists. Each target UE reports CSI only for source UEs in its determined set, creating a segmented reporting structure that reduces overall network traffic while maintaining comprehensive coverage through the collective reports of multiple target UEs.
2Loss of information
If CSI reports are transmitted for all source UEs, then comprehensive channel state information is available, but resource utilization becomes inefficient
Solution Approach 1:
The patent extracts only the essential CSI information by having target UEs determine which source UEs require reporting. This selective extraction ensures that CSI information for all necessary source UEs is captured while eliminating redundant reports, thereby improving resource utilization efficiency without sacrificing information completeness.
Solution Approach 2:
The patent applies partial action by having target UEs report CSI for a subset of source UEs rather than all source UEs. Each target UE performs partial reporting for its determined set, and the combination of partial reports from multiple target UEs achieves complete information coverage while improving resource efficiency.
3Loss of time
If MAC CE transmission is prioritized above sidelink transport channel, then CSI report transmission delay is reduced, but other data transmissions may be delayed
Solution Approach 1:
The patent changes the transmission parameter priorities by assigning higher priority to MAC CE containing CSI reports compared to sidelink transport channel data. This parameter change ensures that CSI reports are transmitted with lower delay, while the system manages overall throughput by selecting which target UEs actually transmit reports based on their determined source UE sets.
Data Source
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AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a target user equipment (UE) may receive a channel state information (CSI) reference signal (RS) from a source UE via a sidelink communication; determine that a lower-layer determined source identifier of the source UE is included in a set of upper-layer determined source identifiers; and transmit a CSI report in a media access control (MAC) control element (CE) as a response to the CSI RS, based at least in part on the determination that the lower-layer determined source identifier of the source UE is included in a set of upper-layer determined source identifiers. Numerous other aspects are provided.