Sidelink Resource Selection for NR-LTE Co-Channel Interference
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing radio resource allocation for UEs performing both NR sidelink and LTE sidelink communication in a co-channel environment, leading to potential interference and instability in signal transmission.
Innovation Solution
A method and device for determining a specific resource set by excluding overlapping candidate resources based on priority and reference signal received power (RSRP) thresholds, allowing efficient allocation of physical sidelink shared channels (PSSCH) in the presence of legacy signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If NR sidelink and LTE sidelink communication co-exist in a co-channel environment, then spectrum utilization is improved, but interference and signal transmission stability deteriorate
Solution Approach 1:
The patent segments the resource pool into different types (type 1 and type 2) with distinct access methods. Type 1 resources use scheduled access controlled by the base station, while type 2 resources use autonomous selection by UEs. This segmentation allows NR and LTE sidelink communications to coexist by assigning different resource types to different services or priority levels, reducing interference while maintaining high spectrum utilization.
Solution Approach 2:
The patent implements dynamic resource allocation where the base station can flexibly configure and reconfigure resource pools based on real-time traffic conditions, channel quality, and interference levels. The resource allocation parameters including time-frequency resources, priority levels, and access methods can be dynamically adjusted to optimize spectrum utilization while managing interference between NR and LTE sidelink communications.
2Productivity
If resource allocation is optimized for NR sidelink communication, then transmission efficiency is improved, but compatibility with legacy LTE sidelink communication deteriorates
Solution Approach 1:
The patent designs a universal resource pool structure that can serve both NR sidelink and LTE sidelink communications. The resource pool configuration includes parameters that are interpreted differently by NR and LTE UEs, allowing the same physical resources to be efficiently utilized by both systems. The base station configures resource pools with multi-functional attributes that enable NR UEs to achieve high transmission efficiency while LTE UEs can access compatible resources for backward compatibility.
Solution Approach 2:
The base station acts as an intermediary that manages resource allocation for both NR and LTE sidelink communications. It configures resource pools with specific parameters and transmission rules that mediate between the different requirements of NR and LTE systems. The base station's configuration messages serve as an intermediary mechanism that translates NR-specific resource requirements into forms that both NR and LTE UEs can understand and utilize appropriately.
3Device complexity
If autonomous resource selection is enabled for NR sidelink, then device complexity is reduced, but resource allocation efficiency and interference management deteriorate
Solution Approach 1:
The base station performs preliminary resource configuration by pre-configuring resource pools with optimized parameters before UE autonomous selection. The base station pre-calculates and configures time-frequency resource patterns, priority levels, and access rules based on predicted traffic patterns and channel conditions. This preliminary action reduces the complexity of real-time autonomous selection for UEs while ensuring that the pre-configured resources maintain high allocation efficiency and interference management capabilities.
Data Source
AI summary
A method by which a terminal is to transmit a signal in a wireless communication system is disclosed. The terminal determines a specific resource set from among resource sets formed of one or more candidate resources allocated for the transmission of a physical sidelink shared channel (PSSCH), wherein: some or all of the one or more candidate resources constituting the resource sets overlap with a first resource for transmitting a first legacy signal of the terminal; and, if a first priority of the PSSCH is higher than a second priority of the legacy signal, the specific resource set can be determined by excluding, from the one or more candidate resources, at least one first candidate resource overlapping with the first resource. Afterward, the terminal can transmit the PSSCH on the specific resource set.