UMTS is a main standard for the 3G. With the maturity of the radio access technology and the extension of multimedia real-time services, it has been an emphasis to research the QoS mechanism in UMTS core network for the network designers and service providers. UMTS是3G的主要标准,随着无线接入技术的成熟和多媒体实时业务的扩展,UMTS核心网中QoS保障机制的研究成为网络设计者和运营商日益关注的重点。
Heterogeneous wireless network is the trend of next mobile communication technology. Each network has different Radio Access Technology(RAT) ( RAT ), which leads different access access type, system architecture, communication capability and service support. 异构无线网络融合是下一代移动通信技术发展的重要发展趋势,各通信网络的无线接入技术不同,导致了相互间的接入方式、系统架构、通信能力以及业务支持等方面都有所不同。
WCDMA is a promising radio access technology for third-generation mobile communication systems because of its high flexibility to support a variety of voice and data service. WCDMA以其更高的系统容量和更好的服务质量被视为一种有潜力的第三代移动通信系统多址接入技术。
LTE improved and enhanced the radio access technology of 3G in order to increase data transmission rate and cell capacity, to reduce system delay, and to improve performance of users at the edge of cells. LTE改进并增强了3G空中接入技术,以提高数据传输速率,提高小区容量和降低系统时延,改善小区边缘用户性能。
This paper describes a new wireless LAN system architecture that combines the wireless LAN radio access technology with GPRS core network's management functions and roaming infrastructure. 无线局域网和移动运营商网络结合起来,利用现有GPRS核心网强大的管理功能和漫游能力,可以拓展无线局域网的业务范围。