Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1996-04-04
1999-04-27
Chin, Wellington
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455450, 455522, 455 69, 455 671, 370337, 370347, H04Q 720
Patent
active
058989250
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to methods and an arrangement for power control of a mobile station, and performing a handover in a mobile telecommunications system in which data is transmitted over the radio path between a mobile station and a base station of a fixed radio network as bursts in time slots of successive frames.
BACKGROUND OF THE INVENTION
In mobile telecommunications systems of the time division multiple access (TDMA) type, time division communication in the radio path takes place in successive TDMA frames each of which consists of several time slots. In each time slot, a short information packet is sent as a radio frequency burst of a finite duration, which burst consists of a number of modulated bits. For the most part, time slots are used for the transmission of control channels and traffic channels. On the traffic channels, speech and data are transmitted. On the control channels, signalling between a base station and mobile subscriber stations is carried out. The Pan-European mobile system GSM (Global System for Mobile Communications) is an example of a TDMA radio system.
For communication in conventional TDMA systems, each mobile station is assigned one time slot of traffic channel for data or speech transmission. Thus, a GSM system, for example, can have as many as eight simultaneous connections to different mobile stations on a same carrier frequency. The maximum data transfer rate on a traffic channel is restricted to a relatively low level according to the bandwidth in use as well as channel coding and error correction, for example in a GSM system to 9.6 kbit/s or 12 kbit/s. In addition, in a GSM system a half-speed traffic channel (max. 4.8 kbit/s) can be chosen for low speeds of speech coding. The half-speed traffic channel is established when a mobile station communicates in a specific time slot only in every second frame, in other words, in half-speed. A second mobile station communicates in every second frame in the same time slot. This is how the capacity of the system can be doubled as far as the number of subscribers is concerned, in other words, on the same carrier wave it is possible for up to 16 mobile stations to communicate simultaneously.
In the last few years, the need for high-speed data services in mobile communication networks has remarkably increased. Data transfer rates of at least 64 kbit/s would be needed to utilize, for example, ISDN (Integrated Services Digital Network) circuit switched digital data services. PSTN data services of the public telephone network, such as modems and telefax terminals of class G3, require faster transfer rates, such as 14.4 kbit/s. One of the growing areas of mobile data transfer requiring higher transfer rates is the mobile video service. As examples of this kind of services, security control by cameras and video databases can be mentioned. The minimum data transfer rate in video transfer can be, for example, 16 or 32 kbit/s.
The data transfer rates of the present mobile communication networks are not, however, sufficient to satisfy this kind of new needs.
SUMMARY OF THE INVENTION
It is an object of the present invention to enable higher data transfer rates in mobile communication networks.
Another object of the invention is a handover and power control of a mobile station in connection with high-speed data transmission.
This object is achieved by a method for power control of a mobile station in a mobile telecommunications system which method comprises transmitting data over the radio path between a mobile station and a base station of a fixed radio network as bursts in time slots of successive frames, and allocating the mobile station at least two time slots in each frame for high-speed data transmission, which method comprises and/or quality, at the mobile station in each time slot allocated to the mobile station, combination of measurement results of two or more time slots, or on the basis of a measurement result of the poorest time slot.
The invention also relates to a handover method in a mobil
REFERENCES:
patent: 4763322 (1988-08-01), Eizenhofer
patent: 4972506 (1990-11-01), Uddenfeldt
patent: 5199031 (1993-03-01), Dahlin
patent: 5404355 (1995-04-01), Raith
patent: 5579373 (1996-11-01), Jang
Hamalainen, et al: "Packet Data Over GSM Network", ETSI TDOC smal 238/93.
Honkasalo Harri
Honkasalo Zhi-Chun
Jokinen Harri
Posti Harri
Chin Wellington
Nokia Mobile Phones Ltd.
Nokia Telecommunications Oy
Sobutka Philip J.
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