Sidelink COT Resource Reservation for NR Uu-Un Sharing
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing channel occupancy time resources for sidelink communications in new radio (NR) networks, particularly in sharing licensed and unlicensed frequency bands, which affects network performance and resource utilization.
Innovation Solution
The implementation of a method where a base station configures resource pools in licensed frequency bands for sidelink control information, including channel occupancy time resources in unlicensed frequency bands, allowing user equipment (UE) to transmit sidelink control information and shared channels using these reserved resources, with listen-before-talk procedures to optimize resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sidelink communications use unlicensed frequency bands for data transmission, then bandwidth and throughput are improved, but resource collision and interference increase
Solution Approach 1:
The patent segments the frequency spectrum into licensed and unlicensed bands, assigning different functions to each. Licensed bands carry control information (SCI) while unlicensed bands carry data (PSSCH), separating control and data planes to reduce interference and resource collision.
Solution Approach 2:
The patent implements preliminary resource reservation where UEs reserve channel occupancy time (COT) resources in advance before transmitting data in unlicensed bands. This advance reservation mechanism prevents resource collision by ensuring that reserved resources are not contested by other users.
2Reliability
If resource pools are configured in licensed frequency bands for control information, then control reliability is improved, but available resources for data transmission are reduced
Solution Approach 1:
The patent adds a frequency dimension to resource allocation by utilizing both licensed and unlicensed bands. Control information is transmitted in the licensed dimension ensuring reliability, while data transmission occurs in the unlicensed dimension expanding available resources. This multi-dimensional approach resolves the trade-off between reliability and resource quantity.
3Productivity
If channel occupancy time resources are reserved in unlicensed frequency bands, then resource utilization efficiency is improved, but complexity of resource management increases
Solution Approach 1:
The patent implements self-service mechanisms where UEs autonomously perform listen-before-talk (LBT) procedures and self-select available COT resources based on pre-configured parameters from the base station. This distributed self-service approach improves resource utilization while minimizing the complexity burden on the network by shifting management decisions to the edge devices.
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 receiving, from a base station (BS), a resource pool (RP) configuration that indicates resources in a licensed frequency band reserved for sidelink control information (SCI), transmitting, to a second sidelink UE, the SCI in the reserved resources, wherein the SCI includes a starting position of channel occupancy time (COT) resources in an unlicensed frequency band, and transmitting, to the second sidelink UE, a physical sidelink shared channel (PSSCH) via the COT resources in the unlicensed frequency band.