NR V2X Resource Allocation for In-Band Emission Interference
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Solution Overview
Problem
In V2X mobile communications, in-band emission (IBE) causes interference between nearby and distant user equipment (UEs) when they use adjacent time-frequency resources, leading to performance degradation due to unequal signal reception powers.
Innovation Solution
A method where a UE identifies occupied resources through sensing and selects adjacent time-frequency resources for transmission, using a power threshold and weighting values to optimize resource allocation, thereby minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If adjacent time-frequency resources are allocated to nearby UEs in V2X network, then resource utilization efficiency is improved, but in-band emission causes interference to distant UEs using the same resources
Solution Approach 1:
The patent applies local quality by differentiating resource allocation based on UE location. Nearby UEs are allocated adjacent time-frequency resources while distant UEs are assigned non-adjacent resources. This location-dependent resource allocation strategy allows efficient utilization for nearby UEs without causing in-band emission interference to distant UEs, thus resolving the contradiction between resource utilization and interference prevention.
2Reliability
If power control is implemented in V2X communications, then received power levels can be equalized, but power control is not suitable for V2X due to IBE characteristics
Solution Approach 1:
The patent implements preliminary action by pre-calculating and pre-allocating resources based on UE location information before transmission occurs. The base station determines which UEs are nearby and which are distant, then assigns adjacent resources to nearby UEs and non-adjacent resources to distant UEs in advance. This prevents in-band emission interference before it occurs, achieving reliable power balance without needing dynamic power control adjustments.
3Productivity
If adjacent resources are used by nearby UEs, then transmission efficiency is improved, but in-band emission negatively impacts system performance
Solution Approach 1:
The patent applies segmentation by dividing the resource allocation strategy into two distinct segments: one for nearby UEs and another for distant UEs. Nearby UEs receive adjacent time-frequency resources to maximize transmission efficiency, while distant UEs are assigned non-adjacent resources to avoid in-band emission interference. This segmented approach allows the system to simultaneously achieve high transmission efficiency and maintain reliable system performance.
Data Source
AI summary
Various examples and schemes pertaining to resource allocation in presence of in-band emission (IBE) for New Radio (NR) vehicle-to-everything (V2X) mobile communications are described. An apparatus implemented in a user equipment (UE) identifies a first resource of a plurality of resources used by another UE in a vehicle-to-everything (V2X) communication environment. The apparatus selects a second resource of the plurality of resources adjacent to the first resource. Then, the apparatus performs transmission in the second resource.