The radio spectrum, a limited resource accommodating multiple radio technologies, necessitates careful integration of V2X systems into vehicles, particularly concerning the 5.9GHz C-ITS band and other radio technologies residing in near frequency bands. Co-existence is pivotal, enabling V2X technology to share the spectrum effectively without disrupting other systems or being affected negatively.
This ensures efficient use of available resources, crucial for enhancing road safety and enabling advanced driver assistance systems or ADFs. Addressing co-channel interference (caused by systems in the same frequency band) and adjacent channel interference (from systems on neighboring channels) is essential, complying with existing spectrum regulations. European regulations, like ETSI TS 102 792 v1.2.1 (2015), define mitigation techniques for adjacent channel interference, ensuring compliance with standards.
Notably, the European Commission discourages static allocation schemes, prompting initiatives like CEPT’s request to ETSI. ETSI’s resulting co-existence methods, detailed in publications such as ETSI TR 103 766 v1.1.1 (2021) and ETSI TR 103 667 v1.1.1 (2021), play a significant role in managing interference and harmonizing the operation of diverse radio technologies in the shared spectrum.
Main Question
Is possible interference prevented based on the overlapping or adjacent frequency bands used by integrated radio technologies?
Sub-Questions
- Are multiple V2X radio technologies concurrently operating in the same band adopted for the development of ADFs? If yes, are methods for co-channel coexistence considered? Are these methods following the recommendations of ETSI TR 103 766 (2021)?
- Are interference mitigation techniques considered and implemented for addressing the co-existence of the own V2X radio technologies with systems such as CEN DSRC operating on adjacent channels? Do they follow appliable recommendations of ETSI TR 102 792 (2015)?
- Can performance of the adopted interference coexistence techniques be verified or ensured by the adopted V2X technology providers?
References
- ETSI TR (2021) 103 667 v1.1.1: Intelligent Transport Systems (ITS); Study on Spectrum Sharing between ITS-G5 and LTE-V2X technologies in the 5 855 MHz – 5 925 MHz band. Available at: https://www.etsi.org/deliver/etsi_tr/103600_103699/103667/01.01.01_60/tr_103667v010101p.pdf (Accessed: 18 October 2023)
- ETSI TR (2021) 103 766 v1.1.1: Intelligent Transport Systems (ITS); Prestandardization study on co-channel co-existence between IEEE- and 3GPP-based ITS technologies in the 5 855 MHz-5 925 MHz band; TR on co-channel co-existence between ITS-G5 and LTE-V2X. Available at: https://www.etsi.org/deliver/etsi_tr/103700_103799/103766/01.01.01_60/tr_103766v010101p.pdf (Accessed: 18 October 2023)
- ETSI TR (2015) 102 792 v1.2.1: Intelligent Transport Systems (ITS); Mitigation techniques to avoid interference between European CEN Dedicated Short Range Communication (CEN DSRC) equipment and Intelligent Transport Systems (ITS) operating in the 5 GHz frequency range. Available at: https://www.etsi.org/deliver/etsi_ts/102700_102799/102792/01.02.01_60/ts_102792v010201p.pdf (Accessed: 18 October 2023)