什么是 EDGE（GSM 演进的增强数据速率）？
无线数据业务预计以平均每年 100-200% 的速度增长，移动通信行业一致认为这将成为未来业务的基石。人们享受非语音服务的好处，许多国家短消息的巨大成功证明了这一点。
EDGE（GSM 演进的增强数据速率）
EDGE 允许比标准 GSM 更快的传输速率。它利用向后兼容的 GSM 数字移动技术扩展。EDGE 采用部分 ITU 的 3G 标准，并拥有 pre-3G 无线电技术。通过适当的修改，它可以在任何GPRS网络上工作。
As part of the GSM family, 3GPP has standardized EDGE. Compact-EDGE, a
variation, was created for usage in a section of the Digital AMPS network
frequency.
EDGE provides higher bit-rates per radio channel due to the introduction of sophisticated data coding and transmission technologies, resulting in a threefold improvement in capacity and performance over a standard GSM/GPRS connection.
The Technology Used in EDGE
The General Packet Radio Services, or GPRS, is a packet-switched
technology that achieves up to 115 kbps and is the first step on the route
to third-generation wireless mobile services (3G).
如果当前正在使用 GPRS，则全球演进增强型数据速率 (EDGE) 技术是低影响转换中最有效的第二步。所需要的只是软件升级和 EDGE 插入式收发器模块。通过允许运营商重复使用他们现有的网络设备和无线电系统，该方法可以保护他们的投资。
通过为 UMTS 实施调整调制，EDGE 实现了从 GPRS 到 UMTS 的演进迁移路径。EDGE 的目标是通过修改所采用的调制类型来提高当前 200 kHz GSM 无线电信道的数据速率，同时保持与现有电路（和分组）交换机的兼容性。
EDGE is primarily a radio interface enhancement, but it can also be considered as a system idea that enables the GSM and TDMA/136networks to provide a set of new services in a broader sense.
Features of EDGE
In 2003, 3GPP standardized it as a member of the GSM family, and
it was used in GSM networks.
EGPRS (Enhanced GPRS) and IMT-Single Carrier are two other names for EDGE (IMT-SC).
It can be used in any packet-switched application. It's also backward compatible, meaning it'll work with prior versions.
It allows data to be transmitted at speeds of 384Kbps through GSM TDMA systems. Gaussian Minimum Shift Keying is a modulation technique used by GSM (GMSK). The 8PSK modulation method is used by EDGE to attain a higher data rate.
引入了额外的网络元素以在从 GSM 切换到 GSM EDGE 时实现基于 IP 的数据传输。两个最关键的额外节点是：GPRS 服务节点网关 (GGSN) 和 GPRS 服务节点服务 (SGSN)。
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