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我的理解如下:
GERAN(GSM EDGE Radio Access Network)
UTRAN (Universal Terrestrial Raido Access Network)
GAN (Generic Access Network)
GERAN A/Gb mode, GERAN Iu mode 与UTRAN Iu mode的区别
GERAN和UTRAN是两个采用不同RAT(Radio Access Technology)的接入网。
GERAN可能通过A/Gb接口连接到2G核心网(Core Network,CN),或者通过Iu接口连接到3G核心网;而UTRAN只能通过Iu接口连接到3G核心网。
所以,在3GPP中,通过GERAN A/Gb mode和GERAN Iu mode来区分在GERAN中工作的不同模式;通过GERAN Iu mode和UTRAN Iu mode来区分通过不同接入网接入到3G核心网的工作模式。
关于这个术语,曾经在3GPP中造成一定的confusion。后来由Vodafone公司在2001年6月份在美国召开的GERAN#5会议上,发送联络函(LS)给RAN、SA和CT等工作组,来澄清这个问题。具体情况可参考GP-011437:LS on terminology clarifications。
GAN (Generic Access Network )
Generic Access Network 是一个扩展移动语音、数据和IMS/SIP over IP的通信系统。Unlicensed Mobile Access (UMA)是其用于marking的比较商业化的名字。
UMA was developed by a group of operator and vendor companies.The initial specifications were published on 2 September 2004. The companies then contributed the specifications to the 3rd Generation Partnership Project (3GPP) as part of 3GPP work item "Generic Access to A/Gb interfaces". On 8 April 2005, 3GPP approved specifications for Generic Access to A/Gb interfaces for 3GPP Release 6 (TS 43.318 and TS 44.318) and renamed the system to GAN. But the term GAN is little known outside the 3GPP community, and the term UMA is more common in marketing.
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