V2X Hopping Method for Frequency Offset Compensation
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Solution Overview
Problem
V2X communication systems face reliability issues due to the high speed of vehicles, which causes rapid changes in channel states and frequency offsets, leading to low communication reliability.
Innovation Solution
A method for performing hopping in V2X communication, where a user equipment (UE) transmits a message using a first transmission resource, determines a second transmission resource by hopping a first hopping unit resource based on a predetermined rule, and drops part of the transmission if it collides with a kth hopping unit resource of a second UE, ensuring stable communication by adjusting resources on a time axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hopping is performed to improve frequency offset compensation and channel estimation, then communication reliability is improved, but transmission resource collision occurs between multiple UEs
Solution Approach 1:
The transmission resource is divided into multiple hopping unit resources that can be independently selected and hopped. Each UE segments its transmission into discrete hopping units that can be individually managed for collision avoidance, allowing frequency hopping while maintaining resource allocation control.
Solution Approach 2:
The network device pre-configures hopping rules and resource allocation for multiple UEs before transmission begins. By preliminarily determining the hopping pattern and resource assignment based on channel conditions and UE identifiers, the system prevents resource collision before it occurs, ensuring reliable frequency hopping without interference.
2Productivity
If transmission resources are adjusted to avoid collision, then resource allocation efficiency is improved, but device complexity increases
Solution Approach 1:
Different hopping rules and resource allocation strategies are applied locally to different UEs based on their specific channel conditions, identifiers, and service requirements. Each UE receives customized hopping parameters rather than a uniform approach, optimizing resource allocation efficiency while keeping individual UE complexity manageable through targeted rather than universal complexity.
Solution Approach 2:
The system dynamically adjusts hopping parameters such as hopping frequency, time offset, and resource block allocation based on channel state information and interference conditions. By changing these parameters adaptively rather than using fixed complex rules, the system improves resource allocation efficiency while maintaining relatively simple device implementation through parameter adaptation rather than structural complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enhances frequency offset compensation and channel estimation performance in V2X communication, improving reliability by adapting to changing channel conditions.
Implementation Method 1
a phase may be sharply changed due to the Doppler effect
Data Source
AI summary
A hopping method for a terminal in vehicle-to-something (V2X) communication is disclosed. The terminal can perform hopping in a preset sized unit and allocate a remaining resource to a resource continuing to a hopped resource. When collision with a transmission resource of another terminal occurs after hopping, some transmission resources can be omitted on the basis of a hopping unit resource of a preset order and/or priority.