Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Patent
1996-05-22
1998-02-03
Kizou, Hassan
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
370442, 370522, H04J 316, H04J 324
Patent
active
057152454
DESCRIPTION:
BRIEF SUMMARY
This application claims benefit of international application PCT/FI94/00268 filed Jun. 16, 1994.
FIELD OF THE INVENTION
The invention relates to a data transmission method and a data transmission system in a cellular radio system, comprising as network elements a base station controller and base stations connected in series thereto via data transmission links; in the method, data is transmitted over the data transmission links in frames divided into timeslots.
BACKGROUND OF THE INVENTION
In cellular radio systems, it is known to connect a plurality of base stations in series with one another by means of data transmission links in such a way that a plurality of base stations are controlled by one base station controller. The base station controller transmits data to each base station through other base stations in a certain predetermined timeslot of the data transmission link. These timeslots are fixed, i.e. the incoming and outgoing traffic of a base station are always carried in the same timeslot/timeslots. FIG. 1 shows a block diagram in which a Base Transceiver Station BTS 1 is connected to a Base Station Controller BSC. FIG. 2 shows base stations BTS 1, BTS 2 and BTS 3 connected in series in such a way that they communicate with the base station controller BSC through one another. An example for data transmission links used for carrying traffic between the base stations of a cellular radio network is a so-called Abis interface described in the GSM recommendations "GSM 12.21, 1992, Network Management Procedures and Messages on the Abis Interface, ETSI" and "GSM 08.54, 1992, BSC-BTS-Layer 1 Specification, ETSI". The Abis interface is divided into timeslots in the manner shown in FIG. 9. The interface may have, e.g., 32 timeslots of 64 kbit/s. When it has been necessary to change, e.g. increase, the amount of data transmitted to the base station, it has been possible to allocate a plurality of timeslots of a data transmission link to a specified base station. This has been implemented such that the base station controller has started to transmit data to each base station in a new timeslot and the base stations have been moved to receive incoming data from the correct timeslots. Typically, the base stations have been moved to receive data transmitted in the correct timeslots by manually modifying the configuration data of the data transmission link in the files of each base station.
In the above solution of the prior art, the number of data transmission links between the base stations of the network, i.e. the configuration of the network, can be modified only manually in such a way that the maintenance personnel checks on all the base stations to be modified and allocates the timeslots needed by means of the operation and maintenance unit of each base station. This is laborious, and if one data transmission link of a network formed by a plurality of base stations is allocated wrong, it may be necessary to re-configure the entire system. In this kind of prior art system, it is impossible to flexibly modify the network structure, i.e. the transmission capacity allocated for connections between different base stations and base station controllers or switching centers. It is thus impossible to modify the transmission capacity of the different base stations e.g. daily, depending on, for example, which base station has the heaviest traffic load. This kind of characteristic would be very useful for mobile phone operators in urban and suburban areas. When a system is used in which transmission capacity can be flexibly allocated to different base stations, the operators are not charged for the maximum transmission capacity between the base stations and the base station controller or switching center, since it is possible to allocate transmission capacity for each connection in the amount needed. Another drawback of the prior art system is that due to manual configuration of the transmission links of the network, it is difficult to manage the network described in the prior art since the network cannot be manag
REFERENCES:
patent: 4686671 (1987-08-01), Burian et al.
patent: 4754453 (1988-06-01), Eizenhofer
patent: 4928274 (1990-05-01), Gilhousen et al.
patent: 4942570 (1990-07-01), Kotzin et al.
patent: 5029163 (1991-07-01), Chao et al.
patent: 5420851 (1995-05-01), Seshadri et al.
ETSI/TC GSM, ETSI/PT12, Apr. 1990 Network Management Procedures and Messages on the A-BIS Interface, pp. 1-83.
ETSI-GSM, Technical Specification, GSM 08.54, Version 3.0.1., UDC:621.396.21, BSC-BTS Layer 1 Structure of Physical Circuits, 5 pages.
Kizou Hassan
Nokia Telecommunications Oy
LandOfFree
Data transmission from a controller to successive bases stations does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Data transmission from a controller to successive bases stations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Data transmission from a controller to successive bases stations will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-669188