| 查看: 170 | 回复: 1 | |||
| 【奖励】 本帖被评价1次，作者zhangjs增加金币 1 个 | |||
| 当前主题已经存档。 | |||
[资源]
UMTS (Universal Mobile Telecommunication System) : The Fundamentals
|
|||
|
UMTS: The Fundamentals Posted by admin under Science And Engineering UMTS (Universal Mobile Telecommunication System) is the third generation telecommunications system based on WCDMA. WCDMA (Wideband Code Division Multiple Access) is the radio interface for UMTS. WCDMA is characterised by use of a wider band than CDMA. It has additional advantages of high transfer rate, and increased system capacity and communication quality by statistical multiplexing, etc. WCDMA efficiently utilises the radio spectrum to provide a maximum data rate of 2 Mbit/s. UMTS (Universal Mobile Telecommunication System) will offer a consistent set of services to mobile computer and phone users no matter where they are located in the world. Based on the GSM (Global System for Mobile communication) communication standard, UMTS, endorsed by major standards bodies and manufacturers, is the planned standard for mobile users around the world by 2002. Today’s cellular telephone systems are mainly circuit-switched, with connections always dependent on circuit availability. Packet-switched connection, using the Internet Protocol (IP), means that a virtual connection is always available to any other end point in the network. It will also make it possible to provide new services, such as alternative billing methods (pay-per-bit, pay-per-session, flat rate, asymmetric bandwidth, and others). The higher bandwidth of UMTS also promises new services, such as video conferencing and promises to realise the Virtual Home Environment (VHE) in which a roaming user can have the same services to which the user is accustomed when at home or in the office, through a combination of transparent terrestrial and satellite connections. Provides an introduction to cellular networks and digital communications Covers the air interface, radio access network and core network Explains the Release ‘99 specifications clearly and effectively Discusses UMTS services and future services beyond 3G Features numerous problems and solutions in order to aid understanding Ideal for Academics and students on telecommunications, electronics and computer science courses, research and development engineers working in mobile/wireless communications and Cellular operators and technical consultants. http://rapidshare.com/files/7420065/UMTS.zip |
回复此楼» 猜你喜欢
292求调剂
已经有6人回复
-
0856材料与化工，270求调剂
已经有6人回复
-
江苏省农科院招调剂1名
已经有3人回复
-
0854复试调剂 276
已经有3人回复
-
材料学硕318求调剂
已经有4人回复
-
265分求调剂不调专业和学校有行学上就
已经有8人回复
-
成果系统访问量大，请一小时后再尝试。---NSFC啥时候好哦，已经两天这样了
已经有4人回复
-
材料化工调剂
已经有12人回复
-
0856调剂
已经有5人回复
-
275求调剂
已经有3人回复
2楼2007-02-28 08:54:35
10