Sidelink Reference Signal Time-Domain Variation for Collision Avoidance
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Solution Overview
Problem
In wireless communications, existing sidelink reference signal transmission methods face challenges in preventing collisions and ensuring that channel state information (CSI) remains up-to-date across multiple UEs, leading to inefficient resource allocation and potential outdated CSI.
Innovation Solution
Implementing a time-domain variation for sidelink CSI resources, which includes assigning orthogonal resources using periodicities, offsets, and time-domain variations such as pseudo-random sequences or cyclic shifts to ensure each UE transmits reference signals without collisions and maintains current CSI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If periodic sidelink resources are assigned for reference signal measurement, then resource allocation efficiency is improved, but collisions between multiple UEs transmitting reference signals may occur
Solution Approach 1:
The patent applies dynamics by making the time-domain offset variable rather than fixed. The network entity configures a sequence of time-domain offsets that vary across different periodic transmission occasions. This dynamic adjustment allows UEs to shift their reference signal transmission times adaptively, preventing collisions while maintaining periodic resource allocation efficiency.
Solution Approach 2:
The patent changes the time-domain offset parameter dynamically. Instead of using a static offset for periodic reference signal transmissions, the system configures multiple offset values in a sequence and varies the offset parameter across different transmission occasions. This parameter variation resolves collisions between multiple UEs while preserving the periodic allocation structure.
2Reliability
If reference signal measurements are performed periodically, then channel state information is maintained, but CSI may become outdated between measurement instances
Solution Approach 1:
The patent applies dynamics by introducing variable time-domain offsets between periodic measurement instances. Instead of fixed periodic intervals, the system dynamically adjusts the timing of reference signal transmissions using configured offset sequences. This allows flexible scheduling that can adapt to channel conditions, maintaining CSI freshness while managing update timing efficiently.
3Productivity
If multiple UEs transmit reference signals simultaneously on the same resources, then resource utilization is maximized, but transmission reliability decreases due to collisions
Solution Approach 1:
The patent applies segmentation by dividing the time domain into multiple offset positions within a periodic structure. Instead of having all UEs transmit simultaneously on the same resource, the system segments the transmission opportunities by assigning different time-domain offsets from a configured sequence to different UEs or transmission occasions. This segmentation prevents collisions while maintaining high resource utilization through the periodic framework.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A relay user equipment (UE) may have a sidelink connection established with each UE of a group of UEs. The group of UEs may be configured with a periodic set of sidelink resources for a reference signal measurement associated with reference signals. Each UE of the group may be configured with a periodicity for the sidelink resources, an initial offset in a first instance of the sidelink resources, and a time-domain variation associated with the reference signals to change the offset across instances of the reference signal resource. The relay UE and the UEs of the group may communicate reference signals over the periodic set of sidelink resources according to the time-domain variation associated with the reference signals.