Điện thoại di động mạng lưới Radio P16

The Future is Wireless A Typical Day in the Year 2000Joe Mobilus is a manager with a haulage firm in a city 100 km away from his home town; his wife Sue is a nurse at the local hospital. Their son Tom and daughter Ann are still at school. 06:30 The central alarm system wakes Joe and Sue in line with their weekly schedule. 07:00 Joe uses his TETRA terminal to access his firm’s central computer to see if there have been any changes to his diary. 07:15 Joe leaves his house and using his cellular phone in the...
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Điện thoại di động mạng lưới Radio P16 Mobile Radio Networks: Networking and Protocols. Bernhard H. Walke Copyright © 1999 John Wiley & Sons Ltd ISBNs: 0-471-97595-8 (Hardback); 0-470-84193-1 (Electronic)16The Future is Wireless16.1 A Typical Day in the Year 2000Joe Mobilus is a manager with a haulage firm in a city 100 km away from hishome town; his wife Sue is a nurse at the local hospital. Their son Tom anddaughter Ann are still at school.06:30 The central alarm system wakes Joe and Sue in line with their weekly schedule.07:00 Joe uses his TETRA terminal to access his firm’s central computer to see if there have been any changes to his diary.07:15 Joe leaves his house and using his cellular phone in the car calls the traffic service to find out about current traffic conditions.07:30 Tom, who is finishing school this year and wants to become a stock- broker, calls up a stock market service on the Internet to have the share prices from New York conveyed over satellite. Then, together with his sister, he leaves to go to school. The Mobilus household is linked to the PSTN/ISDN over an RLL system.08:00 Sue’s cordless DECT telephone rings while Sue is in the bath. Her mother informs her that she has to postpone the joint dinner that was planned for that evening.08:10 Sue informs Joe accordingly, over a pager or the GSM short-message service.08:15 Joe’s car breaks down as he is driving to work. He activates the auto- matic emergency service for his car to call for help with a puncture. To do so, he uses a TETRA service or GSM-SMS.08:20 Because Joe is not sure whether he will make it to the office on time, he sends his secretary an e-mail from his mobile data terminal with the message that she should change his 9 o’clock appointment to a later time. This message is served by GPRS, a non-transparent GSM data service.806 16 The Future is Wireless10:00 Joe has arrived in his office, where he receives a message that a client’s warehouse flooded because of heavy rain during the night and that the goods being delivered should be diverted to a different address.10:05 The firm’s TETRA system enables Joe to make a group call to the vehicles that are just on their way to the warehouse to notify them of the new address.11:00 A customer order requires Joe to spend a long time working closely with Mr. Jones, another employee of the firm, who has his workstation on another floor of the building. To save time, Mr. Jones has his work- station transferred next to Joe’s. This can be done with no problems, because the company has installed a HIPERLAN.13:00 Sue, who has been working in the hospital for four hours, is just looking after the patient in room 8 when she is paged over ERMES. The ERMES terminal indicates that she is urgently needed in casualty admissions.14:00 Joe has to talk to several colleagues jointly at the branch in Russia about a decision concerning a cooperation agreement with a Russian haulage company. He is able to reach them easily over the satellite radio system IRIDIUM, but video conferencing is unfortunately not available.15:00 Tom is called at home by a school friend. Because the friend was ill, he was unable to attend classes today. He asks Tom to send him the homework that was handed out in maths class today. Using the fax machine connected to the DECT system, Tom is able to send the information that was requested.17:00 Ann, who is out shopping with her friend Jane, finds a nice shirt that she wants to give her father for his birthday. Because she is not sure which size to take, she goes to a pedestrian zone to call up her mother using her DECT handset over a Telepoint service.18:00 On the way home, Mr. Mobilus is informed over his cellular phone that he has to visit a customer in Rome the next day. He is able to book his air tickets and hotel reservations through a travel service from his car.19:30 After an evening meal with his family, Joe arranges for the data he needs from his firm for his appointment in Rome to be displayed on his GPRS/GSM data terminal so he can have it printed out.16.2 Wireless Communication in the Year 2005Instead of having many different mobile radio systems and the associatedterminals, each modern user will have a software radio that, using the software-defined configuration of the mobile terminal, adapts to the grade of service16.3 Closing Remarks 807of the radio interface, depending on the service and the location, and largelymakes decisions independently. Because of the flexibility that this allows the user in selecting services,the mobile network operators have entered into a price war and are offeringconfusing, particularly reasonable rates supposedly restricted to certain usergroups. Modern users have a program installed within their terminal thatalways selects the best rate specific to the current receive situation and tothe service to ensure that the software radio is switched to the correspondingmode and the most favourable mobile radio service is being used. UMTS-based PLMNs have been established, but are still available only inhighly crowded areas. The main mobile radio service in the large areas is stillserved by second-generation systems like GSM. There is no longer a restriction to narrowband services in hot communi-cations traffic spots (like airports, sports arenas, fairs, etc.), because evenbroadband (ATM- and IP-based) services are now available as wireless ser-vices at broadband terminals. However, the costs for these services are stillso high ...