Multiplexing S-SSB and CSI-RS for OCB Compliance
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Solution Overview
Problem
In wireless communication systems, particularly in the context of sidelink communications, there is a challenge in meeting the minimum occupied channel bandwidth (OCB) requirement in unlicensed frequency bands, especially when transmitting sidelink synchronization signal blocks (S-SSBs) alone may not satisfy the OCB threshold.
Innovation Solution
The solution involves multiplexing S-SSB transmissions with channel state information reference signals (CSI-RS) transmissions in a sidelink slot, using a configuration that satisfies the OCB threshold. This can be achieved by determining a multiplex configuration that allows for the CSI-RS transmission to be multiplexed in frequency or time with the S-SSB transmission, ensuring compliance with the OCB requirement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If S-SSB transmission is performed alone in unlicensed frequency bands, then the transmission structure is simple, but the occupied channel bandwidth (OCB) requirement is not met
Solution Approach 1:
The patent combines S-SSB transmission with CSI-RS transmission in the same time-frequency resources. By merging these two signal types, the system achieves sufficient occupied channel bandwidth to meet regulatory requirements while maintaining efficient resource utilization. The combination allows the transmission to satisfy minimum bandwidth thresholds without requiring separate dedicated resources.
Solution Approach 2:
The patent makes the S-SSB slot serve multiple functions: synchronization signal transmission, channel state information reference signal transmission, and OCB requirement satisfaction. By enabling the same transmission slot to fulfill multiple purposes, the system avoids the need for separate transmissions and achieves regulatory compliance efficiently.
2Reliability
If CSI-RS is multiplexed with S-SSB in frequency domain, then OCB requirement is satisfied, but frequency resources are consumed
Solution Approach 1:
The patent merges S-SSB and CSI-RS transmissions in the frequency domain within the same slot, allowing both signals to share the available frequency resources. This merging approach satisfies the OCB requirement while optimizing the utilization of frequency spectrum, as the signals are transmitted simultaneously rather than requiring separate frequency allocations.
Solution Approach 2:
The patent transitions from time-domain multiplexing to frequency-domain multiplexing of S-SSB and CSI-RS. By changing the dimension of resource allocation from time to frequency, the system achieves better spectral efficiency and meets OCB requirements without sacrificing time resources that would be needed for sequential transmissions.
3Measurement precision
If separate transmissions of S-SSB and CSI-RS are used, then each signal can be optimized independently, but transmission overhead increases
Solution Approach 1:
The patent combines S-SSB and CSI-RS transmissions in the same slot, reducing the total number of transmission opportunities needed. This merging reduces transmission overhead by eliminating redundant slot allocations, control signaling, and resource management complexity that would be required for separate transmissions, while still allowing independent signal optimization through configurable parameters.
Data Source
AI summary
Wireless communications systems and methods related to communicating control information are provided. A method of wireless communication performed by a first sidelink user equipment (UE) may include transmitting, to a second sidelink UE, at least one channel state information reference signal (CSI-RS) in a slot and transmitting, to the second sidelink UE, at least one sidelink synchronization signal block (S-SSB) in the slot, wherein an occupied channel bandwidth (OCB) associated with the slot satisfies a threshold based at least on the transmitting the at least one CSI-RS and the transmitting the at least one S-SSB.