Dynamic Sidelink Feedback Resource Mapping for LTE-NR Coexistence
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communications, the coexistence of different radio access technologies (RATs) such as LTE and NR in the same channel leads to interference, as NR devices supporting sidelink feedback may degrade LTE communications due to the lack of sidelink feedback support in LTE devices.
Innovation Solution
The described techniques dynamically determine Physical Sidelink Feedback Channel (PSFCH) resources by estimating sidelink transmission resource availability in a shared sidelink resource pool. This involves mapping sidelink transmission resources to PSFCH occasions and identifying resources for sidelink feedback transmissions, thereby minimizing interference between RATs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If NR devices transmit sidelink feedback in shared resources, then sidelink communication reliability is improved, but LTE communication quality deteriorates due to interference
Solution Approach 1:
The shared sidelink resource pool is segmented into separate resource pools for different RATs based on channel occupancy estimation. When LTE channel occupancy exceeds a threshold, NR sidelink feedback transmissions are restricted to specific time-frequency resources, preventing interference with LTE communications while maintaining feedback functionality.
Solution Approach 2:
The resource pool configuration for NR sidelink feedback is dynamically adjusted based on real-time channel occupancy measurements. The system monitors LTE channel occupancy and adaptively modifies the NR feedback resource allocation, expanding or restricting NR access to shared resources according to LTE traffic conditions.
2Productivity
If different RATs share the same wireless spectrum, then spectrum utilization efficiency is improved, but communication reliability between RATs deteriorates due to cochannel interference
Solution Approach 1:
The system implements channel occupancy measurement and feedback mechanisms where NR devices monitor LTE channel usage and adjust their feedback transmission resources accordingly. This feedback loop enables dynamic resource allocation that maintains both high spectrum utilization and reliable communication across different RATs.
Solution Approach 2:
The resource allocation parameters for NR sidelink feedback are changed based on LTE channel occupancy conditions. When interference is detected, the system modifies time-frequency resource assignments, feedback transmission timing, and power levels to ensure coexistence while maintaining overall spectrum efficiency.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A first user equipment (UE) may receive a sidelink message via a sidelink transmission resource of a shared sidelink resource pool that is shared between a communications according to a first radio access technology (RAT) and communications according to a second RAT. The UE may map sidelink transmission resource occasions of the shared resource pool to a physical sidelink feedback channel (PSFCH) occasion and map subchannels of the sidelink transmission occasions to respective resources of the PSFCH occasion. The UE may transmit a sidelink feedback message corresponding to the sidelink message using a resource of the PSFCH occasion corresponding to a subchannel carrying sidelink control information of the sidelink message.