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2G wireless network
Second-generation (2G) digital cellular networks used by mobile phones. 2G networks was developed as a replacement for first generation (1G) analog cellular networks, and the GSM standard originally described a digital, circuit-switched network optimized for full duplex voice telephony. This expanded over time to include data communications, first by circuit-switched transport, then by packet data transport via GPRS (General Packet Radio Services) and EDGE (Enhanced Data rates for GSM Evolution or EGPRS).
2G wireless network的贡献者
2G wireless network
特种移动通信系统
移动通信; 2G wireless network
用于地下、水下或深空等特殊环境的专业部门特种需求的移动通信系统。由于其使吊环境和各专业部门工作要求不同，其系统特性、设备规范有显著差异。地下移动通信主要是用于矿井，地铁及人防工程的漏泄电缆通信系统及900MHz无中心选址通信系统。水下移动通信主要是用于潜艇的超长波通信系统及声纳通信系统。深空移动通信主要是用于航天飞机等空间运载体与地面之间的极远距离通信系统。 ...
