Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Patent
1996-11-08
1999-12-21
Pham, Chi H.
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
370347, H04B 7212, H04B 726
Patent
active
060058579
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for improving data transmission in a mobile telecommunications system, using the method, data is transmitted over the radio path between a mobile station and a base station as bursts within time slots allocated to the mobile station in successive frames.
2. Description of the Related Art
In mobile telecommunications systems of a 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 a traffic channel for data or speech transmission. Thus, a GSM system, for example, can have as much 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 these kinds 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 these kinds 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.
The object is achieved in a mobile telecommunications system, of the type illustrated in the introductory section, by a method which according to the present invention is characterized by prior to a transmission over the radio path, two time slots from each frame corresponding to the number of said signals of lower speed, slots.
The invention further relates to an arrangement for high-speed data transmission in a mobile telecommunications system in which data is transmitted over the radio path between a mobile station and a base station as bursts in time slots allocated to a mobile station by successive frames. According to the invention, it is characteristic of the arrangement that it comprises means for splitting a data signal, whose speed is higher than the maximum data transfer rate in a time slot, in
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Honkasalo Harri
Honkasalo Zhi-Chun
Jokinen Harri
Posti Harri
Nokia Mobile Phones Ltd.
Nokia Telecommunications Oy.
Pham Chi H.
Tran Maikhanh
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