This paper proposed an optimized fast handoff scheme for real time applications in next generation IP based CDMA wireless networks. The idea is to utilize optimized IP multicasting handoff (based on PIM SM), which is ...This paper proposed an optimized fast handoff scheme for real time applications in next generation IP based CDMA wireless networks. The idea is to utilize optimized IP multicasting handoff (based on PIM SM), which is triggered by CDMA layer 2 functionality. An IP based cellular network model with WCDMA FDD air interface and IP based packet traffic is adopted. No special network entities and signaling for handoff are added in our network model. The simulation results show that low delay and low packet lost rate can be obtained.展开更多
An improved technique with a fractional sampling based on two samples per chip, according to the Nyquist criterion, has been employed by the authors to enhance the performance in the code synchronization of UMTS (or W...An improved technique with a fractional sampling based on two samples per chip, according to the Nyquist criterion, has been employed by the authors to enhance the performance in the code synchronization of UMTS (or W-CDMA) systems. In this paper, we investigate on the theoretical rationale of such a promising behavior. The performance is analyzed for several wireless channels, in the presence of typical pedestrian and vehicular scenarios of the IMT2000/UMTS cellular systems.展开更多
朗讯科技公司近日宣布将为mmO2集团位于马恩岛(Isle of Man)的子公司Manx电信(Manx Telecom)部署全球第一个超高速的固定移动融合网络。新的商用3Gw—CDMA网络将采用超高速的高速下行分组接入(HSDPA)技术和朗讯IP多媒体子系统(IMS)解决...朗讯科技公司近日宣布将为mmO2集团位于马恩岛(Isle of Man)的子公司Manx电信(Manx Telecom)部署全球第一个超高速的固定移动融合网络。新的商用3Gw—CDMA网络将采用超高速的高速下行分组接入(HSDPA)技术和朗讯IP多媒体子系统(IMS)解决方案。从而使Manx电信得以为其无线和有线客户提供“混合的”移动高速数据、多媒体和VolP服务。这将是欧洲首次部署超高速3G网络。展开更多
文摘This paper proposed an optimized fast handoff scheme for real time applications in next generation IP based CDMA wireless networks. The idea is to utilize optimized IP multicasting handoff (based on PIM SM), which is triggered by CDMA layer 2 functionality. An IP based cellular network model with WCDMA FDD air interface and IP based packet traffic is adopted. No special network entities and signaling for handoff are added in our network model. The simulation results show that low delay and low packet lost rate can be obtained.
文摘An improved technique with a fractional sampling based on two samples per chip, according to the Nyquist criterion, has been employed by the authors to enhance the performance in the code synchronization of UMTS (or W-CDMA) systems. In this paper, we investigate on the theoretical rationale of such a promising behavior. The performance is analyzed for several wireless channels, in the presence of typical pedestrian and vehicular scenarios of the IMT2000/UMTS cellular systems.
文摘朗讯科技公司近日宣布将为mmO2集团位于马恩岛(Isle of Man)的子公司Manx电信(Manx Telecom)部署全球第一个超高速的固定移动融合网络。新的商用3Gw—CDMA网络将采用超高速的高速下行分组接入(HSDPA)技术和朗讯IP多媒体子系统(IMS)解决方案。从而使Manx电信得以为其无线和有线客户提供“混合的”移动高速数据、多媒体和VolP服务。这将是欧洲首次部署超高速3G网络。
