B3G: Beyond Third Generation in mobile communication system, as opposed to 3G mobile communications, B3G has a higher transmission efficiency and all types of business. B3G technology research from the late 20th century when the 3G technology to complete standardization began. In 2006, ITU-R officially named B3G technology IMT-Advanced technology (3G technology, called IMT-2000). According to the original work plan, IMT-Advanced standardization has been "imminent." ITU-R will be in February 2008 issued a circular to all countries, countries and standards organizations to call for IMT-Advanced technology proposal. IMT-Advanced technologies need to achieve higher data rates and greater system capacity, the target peak rate: slow moving, hotspot coverage scenarios 1Gbit / s or more; fast-moving, wide-area coverage scenario 100Mbit / s or more. Internationally for IMT-Advanced research has made a series of important progress. Japan has passed NTTDoCoMo 4 × 4 and 12 × 12 multi-antenna MIMO technology at 100MHz bandwidth, respectively, verified the 1Gbit / s (outdoor experiment) and 5Gbit / s peak transfer rate, in the hardware implementation is a world leading position. EU 6th Framework project since the start of 2004 WINNER attracted major European telecommunications equipment manufacturers. The first phase (Phase Ⅰ) was the end of 2005, on a variety of key technologies for B3G extensive research, the formation of a systematic study conclusions; the end of 2007 to complete the second phase (Phase Ⅱ) will complete the system design and performance assessment, formation of a sound technical solutions; the third stage in 2008 (Phase Ⅲ) will demonstrate the system's development and experimentation. Meanwhile, the EU strongly supported the World Wireless Research Forum (WWRF) has become a major international technology exchange platform for B3G one. In addition, Japan and South Korea were also set up a forum and NGMC mITF forum to promote their B3G research. Overall framework As human society, rapid development and continuous improvement, there is a growing yearning for Li Yong portable cell phone anytime, anywhere communication links with each other, so B3G communication system is not confined to the use of mobile cellular networks, mobile communications areas of study should be expanded. Indeed, the mobile cellular network has to communicate to people the freedom to play an unprecedented role in contact, they continue to improve and develop is fully consistent with the needs of society. However, in addition to mobile cellular networks, there are wireless local area network WLAN, wireless metropolitan area network WMAN, WPAN WPAN, satellite communication networks, digital broadcasting network, stratospheric communication network, such as traditional wired network. These have their own characteristics and the best access network application environment, B3G communications systems should not be replaced by a completely different network than the network, but access should be through a variety of integration technologies and standards to provide users with transparent, efficient service [6 ]. Expected future B3G mobile communication systems will integrate cellular, RLAN (Radio Local Area Network), digital broadcasting, satellite and other access systems, and to ask for the seamless interaction between these systems, based on end-users performance, position and type of enjoyment and more kind of transport mechanism to provide a variety of information. Different wireless access systems will be interconnected by a flexible core network, horizontal / vertical switching services, mobility, security and QoS aspects of consultation to provide seamless services to the core by the core network or access network servers. To achieve this seamless service, to develop highly adaptive, symmetric / asymmetric packet data transmission solutions.
No comments:
Post a Comment