NR-U Sidelink Resource Reservation via Segmented COT
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Solution Overview
Problem
In wireless communication networks, especially in 5G NR-U sidelink channels, existing resource reservation methods lead to increased LBT operations, collisions, and inefficiencies due to the need for multiple devices to contend for shared resources, resulting in reduced throughput and increased latency.
Innovation Solution
A method where a user equipment (UE) performs a Listen-Before-Talk Category 4 operation at the start of a Channel Occupancy Time (COT) and reserves resources in a non-shared portion of the COT, allowing for continuous transmission and subsequent transmissions based on successful LBT Category 1 or 2 operations, reducing the need for intensive LBT procedures and enhancing resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple devices contend for shared resources using existing resource reservation methods, then resource allocation is achieved, but LBT operations increase and collisions occur more frequently
Solution Approach 1:
The patent segments the Channel Occupancy Time into shared and non-shared portions, allowing different LBT procedures to be applied to different resource portions. This segmentation enables devices to perform simplified LBT (Category 1 or 2) in non-shared portions while maintaining proper contention control in shared portions, thereby reducing overall LBT operation time and increasing resource utilization efficiency.
2Productivity
If multiple devices contend for shared resources, then resource allocation is achieved, but collisions increase and throughput decreases
Solution Approach 1:
The patent applies preliminary action by having the first device perform a full LBT Category 4 procedure at the start of the COT to secure the channel, then reserving non-shared portions for subsequent transmissions. This preliminary channel acquisition eliminates the need for other devices to contend for these reserved resources, thereby preventing collisions and ensuring reliable high-throughput transmissions.
3Reliability
If intensive LBT procedures are performed for each transmission, then channel access control is improved, but latency increases
Solution Approach 1:
The first device performs the intensive LBT Category 4 procedure in advance at the start of the COT to acquire channel access rights. This preliminary action establishes the device's authority to transmit in subsequent non-shared portions without requiring repeated intensive LBT procedures, thereby maintaining reliable channel access control while significantly reducing transmission latency.
Solution Approach 2:
The patent introduces dynamic LBT category selection based on the resource portion type. Devices dynamically switch between full LBT Category 4 for initial channel acquisition and simplified LBT Category 1 or 2 for subsequent transmissions in non-shared portions. This dynamic adaptation optimizes the balance between channel access control reliability and transmission latency.
Data Source
AI summary
In one aspect, a method of wireless communication includes transmitting, by a user equipment (UE), a first transmission in a first Channel Occupancy Time (COT) for a NR-U sidelink channel. The method also includes reserving, by the UE, a resource in a non-shared portion of a second COT and performing, by the UE, a Listen-Before-Talk (LBT) Category (CAT) 4 operation at a start of the second COT, wherein the second COT is associated with the UE. The method includes performing, by the UE, a continuous transmission operation in the second COT based on successfully performing the LBT CAT 4 operation. The method further includes transmitting, by the UE, a second transmission in the reserved resource of the non-shared portion of the second COT based on successfully performing a second LBT CAT 1 or 2 operation. Other aspects and features are also claimed and described.