https://block-strategy.com/2021/04/15/mavenir%e4%b8%8e%e8%b5%9b%e7%81%b5%e6%80%9d%e5%90%88%e4%bd%9c%ef%bc%8c%e5%b0%86open-ran%e5%a4%a7%e8%a7%84%e6%a8%a1mimo%e4%ba%a7%e5%93%81%e7%bb%84%e5%90%88%e6%8e%a8%e5%90%91%e5%b8%82%e5%9c%ba/