Roadside Network Unit Frequency Segmentation for V2X Collision Reduction
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Solution Overview
Problem
The coexistence of IEEE 802.11p and LTE-V2X wireless communication technologies in the 5.9 GHz ITS frequency spectrum leads to performance degradation due to overlapping unlicensed frequency usage, necessitating a mechanism to fairly allocate resources and reduce collision probabilities.
Innovation Solution
A method for operating a roadside network unit that segregates communication between licensed and unlicensed frequency ranges by transmitting payload data on sidelink and ad hoc channels, utilizing a combination of LTE-V2X and IEEE 802.11p protocols to minimize collisions and leverage the advantages of both technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both IEEE 802.11p and LTE-V2X technologies operate in the unlicensed 5.9 GHz frequency range, then both systems can provide V2X communication services, but collision probability increases and performance degrades
Solution Approach 1:
The patent segments the frequency spectrum into licensed and unlicensed portions, allocating different communication technologies to different frequency bands. LTE-V2X operates on licensed frequencies while IEEE 802.11p uses unlicensed frequencies, thereby reducing spectral overlap and collision probability between the two systems
Solution Approach 2:
The patent applies different communication protocols and frequency allocations to different spatial locations or coverage areas. Base stations control LTE-V2X communications in their coverage areas while allowing IEEE 802.11p ad hoc networks to operate in unlicensed bands, creating localized optimization for each technology
2Reliability
If LTE-V2X uses scheduled transmission controlled by base station, then transmission collisions are minimized, but coverage is limited to areas with base station signal availability
Solution Approach 1:
The patent introduces IEEE 802.11p ad hoc communication as an intermediary system that operates independently of base stations in unlicensed frequency bands. This intermediary provides V2X communication capability in areas where LTE-V2X base station coverage is unavailable, thereby extending overall system coverage
Solution Approach 2:
The patent creates a universal V2X communication system that supports both LTE-V2X (base station controlled) and IEEE 802.11p (ad hoc) modes. Vehicles can switch between or simultaneously use both communication modes depending on coverage availability, making the overall system adaptable to various deployment scenarios
3Adaptability or versatility
If IEEE 802.11p uses contention-based channel access, then coverage area is extended beyond base station range, but transmission collisions increase with higher network density
Solution Approach 1:
The patent changes the frequency band parameter for IEEE 802.11p operations, allocating it to unlicensed spectrum while LTE-V2X uses licensed spectrum. This parameter change reduces spectral interference and collision probability between the two systems, improving reliability while maintaining extended coverage capability
Data Source
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AI summary
A method for operating a roadside network unit is proposed that comprises: ascertaining (302) useful data for sending to at least one further roadside network unit, providing (304) the useful data for sending on a sidelink channel in a licensed frequency range and/or for sending on an ad-hoc channel in an unlicensed frequency range, and sending (304) the useful data on the sidelink channel in the licenced frequency range and/or on the ad-hoc channel in the unlicensed frequency range.