GSM移动通信系统.pdf

数字通信 (第二十讲) GSM无线通信系统 2009-12 Yuping Zhao (Professor) 赵玉萍 Department of Electronics Peking University Beijing 100871, China email: yuping.zhao@pku.edu.cn 1 Events in the development of GSM Events in the development of GSM Year Events CEPT establishes a GSM group in order to develop the standards for a 1982 pan-European cellular mobile system(工作组成立) Adoption of a list of recommendations to be generated by the group(若 1985 干标准建议被接收) Field tests were performed in order to test the different radio 1986 techniques proposed for the air interface(进行了场强测试) TDMA is chosen as access method (in fact, it will be used with 1987 FDMA)(确定了基于TDMA/FDMA的接入方式) 1988 Validation of the GSM system(验证了GSM系统) 2 Events in the development of GSM Events in the development of GSM The responsibility of the GSM specifications is passed to the 1989 ETSI(ETSI承担了GSM标准化工作) Appearance of the phase 1 of the GSM specifications (GSM标 1990 准1出现) 1991 Commercial launch of the GSM service (GSM开始商用) Enlargement of the countries that signed the GSM- MoU 1992 Coverage of larger cities/airports(扩大GSM覆盖到大城市及机 场等地区) Coverage of main roads GSM services start outside Europe(覆 1993 盖到欧洲之外国家) Phase 2 of the GSM specifications Coverage of rural 1995 areas(GSM标准2 出现) 3 GSM网络构成 4 GSM mobile network GSM mobile network Architecture of the GSM netw