ETSI ETS 300 609-2-1998 数字蜂窝通信系统(第2阶段).基站系统(BSS)设备规范.第2部分:信令方面.GSM 11.23(第2版,版本4.7.1).
Digital Cellular Telecommunications System (Phase 2); Base Station System (BSS) Equipment Specification; Part 2: Signalling Aspects (Third Edition; GSM 11.23 Version 4.9.1)