TDM Coexistence for V2X Spectrum Utilization
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Solution Overview
Problem
In wireless communication systems, vehicle-to-everything (V2X) technologies such as ITS-G5 and LTE/NR often operate in the same spectrum, leading to interference and performance degradation due to incompatibility, especially when vehicles from different manufacturers use different technologies without a consensus on which to prioritize.
Innovation Solution
Implementing time division multiplexing (TDM) based coexistence schemes that dynamically adjust resource allocation based on traffic load, allowing both technologies to share resources efficiently by designating specific time slots for each technology, with vehicles or roadside units determining optimal TDM configurations either through network updates or energy sensing in coverage or out-of-coverage scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple V2X technologies (ITS-G5 and LTE/NR) operate in the same spectrum simultaneously, then spectrum utilization is improved, but interference and performance degradation occur due to technical incompatibility
Solution Approach 1:
The patent segments the time domain by introducing TDM configurations that divide the communication spectrum into different time slots. Each V2X technology (ITS-G5 and LTE/NR) is allocated specific time periods for transmission, preventing simultaneous operation and resulting interference. The time slot allocation is based on traffic load distribution, with each technology receiving appropriate time resources proportional to its demand.
Solution Approach 2:
The patent implements dynamic TDM configuration where the time slot allocation is not fixed but adapts to changing traffic conditions. The system determines TDM configurations based on real-time traffic load measurements from network nodes or roadside units, allowing flexible adjustment of time resources. This dynamic adaptation enables optimal spectrum sharing while maintaining communication reliability under varying conditions.
2Measurement precision
If TDM configuration is determined through network updates, then coordination accuracy is improved, but system complexity increases due to signaling overhead
Solution Approach 1:
The patent introduces roadside units (RSUs) as intermediary entities that perform traffic load measurements and TDM configuration determinations. Instead of requiring complex centralized network control, RSUs act as distributed intermediaries that collect traffic information from nearby vehicles and compute appropriate time slot allocations. This intermediary approach simplifies the overall system architecture by distributing intelligence to edge locations.
Solution Approach 2:
The system enables self-organizing TDM configuration where vehicles and roadside units autonomously determine time slot allocations based on measured traffic loads. The patent implements mechanisms where RSUs automatically measure traffic conditions and generate TDM configurations without requiring manual network provisioning. Vehicles also autonomously select appropriate time slots based on broadcasted configuration information, reducing the need for complex centralized coordination.
3Adaptability or versatility
If vehicles from different manufacturers use different V2X technologies without consensus, then technological diversity is improved, but interference increases due to lack of coordination
Solution Approach 1:
The patent creates a universal TDM framework that accommodates multiple V2X technologies (ITS-G5, LTE/NR) within a single coordinated system. The time slot allocation mechanism serves all technologies uniformly, with each technology operating in its designated time periods according to its specific channel access rules. This universal approach allows technological diversity to coexist without causing interference, as the TDM structure provides a common coordination layer that respects the operational requirements of each technology.
Data Source
AI summary
Aspects described herein relate to methods for TDM based co-existence of V2X technologies. A method may comprise receiving a time division multiplexed configuration that is determined based on a distribution of a plurality of technologies in a communication system, the distribution corresponding to a traffic load of each technology and transmitting in accordance with channel access methods of one of the plurality of technologies during a resource allocated according to the received TDM configuration. In an aspect, each of the plurality of technologies operate in accordance with channel access methods defined for each technology.