Multiplex communications – Communication over free space – Combining or distributing information via time channels
Reexamination Certificate
1998-08-28
2001-11-13
Vu, Huy D. (Department: 2663)
Multiplex communications
Communication over free space
Combining or distributing information via time channels
Reexamination Certificate
active
06317423
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a method for controlling a base station, used in a cellular radio system employing TDMA multiple access method and comprising terminals, sectors and at least one base station which transmits one or more carriers, and which comprises a number of baseband parts, and at least one transmitter/receiver unit, and which is connected to the rest of the system by a digital transmission line in which information is transmitted in timeslots.
Prior art knows a Base Transceiver Station (i.e. BTS) of a cellular radio system, which transmits data to the radio path and which receives data from the radio path. The data stream received from the transmission path at the base station has been divided into frames that comprise timeslots. The timeslots comprise, in digital form, data contained by the different channels. The data in the timeslots of the frame have been processed in a suitable way at the base station, and the processed data have been allocated via the base station sections to subscriber terminals located in different parts in a sector of a cell in the cellular radio system. In the known solutions, channel allocation to different carriers and sectors has been determined by fixed timeslot allocation settings.
It has not, however, been easy to change the allocation settings of channels received at the base station because the allocation settings have been fixed. As a consequence of the difficult changing of the allocation settings, it has not been possible to utilize the transmission path capacity efficiently or flexibly enough. What was set forth above means that the data equipments on the transmission path have not met quickly or efficiently enough the requirements of other equipments using the transmission path. Allocation of channels into different sectors in the prior art required changing the allocation settings of transmission equipments in the base station, which was difficult and slow because the settings had to be changed manually. It was necessary to allocate timeslots from the transmission equipments even though the base station at that moment was not able to utilize the allocated timeslots. The costs have been added to by the requirement to allocate a lot of capacity in a base station in order to take into account that the network is at times loaded heavily and unevenly. It has, however, proved to be difficult to change the channel configuration of the network so that the network would operate flexibly under all loads.
BRIEF SUMMARY OF THE INVENTION
It is consequently the object of the present invention to provide a method by means of which the allocation of channels originating from the transmission direction may be allocated to the radio path as flexibly and efficiently as possible.
This object is achieved by means of a method of the type set, forth in the introduction, characterized in that timeslots are allocated as required to different carriers, and that the baseband parts are allocated as required to the different sectors.
The invention further relates to a base station used in a cellular radio system employing TDMA multiple access method and comprising terminals, sectors, a transmission line and at least one base station Which transmits one or more carriers, and which comprises a number of baseband parts, and at least one transmitter/receiver unit, and which is connected to the rest of the system by a digital transmission line in which information is transmitted in timeslots.
The receiver according to the invention is characterized by comprising control means for allocating the timeslots as required to different carriers, and for allocating the baseband parts to different sectors.
With the method according to the invention, reconfiguration of channel allocation settings, related to the known methods, may be avoided. In the method, the base station assigns the channels received in timeslots at the base station in its transmission block, i.e. allocation means, to any of the carriers transmitted by the base station. This results in that the method according to the invention contributes to a cellular radio network, particularly a GSM network, becoming more flexible and easier to maintain.
The base station according to the invention also has a number of advantages. The base station assigns timeslots received at the allocation means of the base station to those sectors in which capacity at any one time is needed. The baseband parts of the base station may be divided among the different sectors of the base station. The radio frequency block, of the We station, i.e. the transmitter/receiver unit, is capable of handling several carriers. In this manner, the number of parts in the base station may be reduced, which consequently decreases the costs of constructing a network. The base station controls the timeslot settings of the allocation means to be on and off so that a timeslot becoming free may be used by other terminals seeking to have a connection. The solution according to the invention does not involve fixed allocation settings for the timeslots but the allocation settings are changed dynamically.
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Jantti Arto
Peltola Jukka
Boakye Alexander O.
Nokia Telecommunications Oy
Pillsbury & Winthrop LLP
Vu Huy D.
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