[1通常代表同频切换2代表异频3代表异系统切换4代表Traffic测量切换等]Event 1a: A Primary CPICH enters the Reporting Range (FDD only). 主公共导频信道Event 1b: A Primary CPICH leaves the Reporting Range (FDD only). 主公共导频信道离开了测量范围Event 1