Wireless

摘要

Vehicle-to-vehicle (V2V) anti-collision systems could potentially provide warnings in as many asrn76 percent of multi-vehicle collisions involving at least one light vehicle, but spectrum concerns arernamong the major issues that remain, GAO said in a report released Friday. In January, former FCC ChairmanrnJulius Genachowski floated a proposal to use 5 GHz spectrum, including the 5850–5925 MHz bandrnalready dedicated to V2V systems, to help alleviate Wi-Fi congestion. “Although existing FCC regulationsrnare designed to ensure that unlicensed devices do not cause interference, four automobile manufacturersrnand 16 experts we interviewed expressed concern or uncertainty about the potential effects of allowingrnunlicensed devices to share the 5.9 GHz band,” GAO said (http://1.usa.gov/16sMAkf). “One automobilernindustry group said that its members are not opposed to opening the 5.9 GHz band for sharing but emphasized the importance of understanding the implications of doing so to ensure that it will not hinderrncritical V2V safety applications.” One expert suggested sharing the spectrum “would create an added burdenrnfor both automobile manufacturers and suppliers, which would have to consider technical steps tornmake coexistence with unlicensed devices feasible and conduct additional testing to maintain confidencernthat V2V technologies will work as envisioned,” GAO said.