-第二代移动通信系统向第三代移动通信系统演进1.pptVIP

2003-9 第二代移动通信系统向第三代移动通信系统 演进 市场驱动力 Emerging Challenges for the Operator Maintaining profit margins Existing wireless operators have to look beyond traditional voice services in order to maintain and grow margins Wireless Applications Vertical Business Mobile Office Personal Finance Entertainment Information Travel Shopping Friends Family Route Planning Third Generation (ITU) Requirements Wireless Technologies Map Air Interface Evolution to 3G Air Interface Evolution (Based on GSM Infrastructure) 2G vs. 3G Wireless Migration Packet Network Roadmap IP is Evolving to Meet the Need IP Extensions to Support Cellular Attributes Passive Connectivity Mobility Management Handoff Mechanisms Quality of Service Billing Mechanisms Ubiquitous Scalability BC (Before Cellular) Single Channel Radio Telephone High power transmitter on a high spot Each user has own channel range of 50 miles Trunked Radio “Trunking efficiency” by sharing channels More spectrum efficient Cellular like Trunked radio, share the channels Low power= small coverage area Low power = frequency reuse More expensive infrastructure Data - What Are Consumer Needs? Affordable Terminal Service “Attractive” terminal Human factors input / output Battery life Form factor Responsiveness Useful data (“walled garden”) Quick response Sorted response (time critical / location critical) Applications Data Services- Middleware Data Services- Business issues Usefulness of information Metcalfe’s law: value of network increase as the exponent of connected nodes: V~ KN Corollary: value of a wireless network is inversely proportional to the number of incompatible standards: V ~ 1/S SMS Very Popular, Except in US “Rule of thumb” at 30% pen usage explodes US penetration is about 35% But we have 5 standard - 10% max on any one Metcalfe’s law in reverse European environment calling party pays - no cost for incoming Internet cost per minute SMS is a way of making money go father Postulation - SMS would be explosive i