Telecommunications – Carrier wave repeater or relay system – Failure compensation
Patent
1996-03-22
1998-05-12
Eisenzopf, Reinhard J.
Telecommunications
Carrier wave repeater or relay system
Failure compensation
455 9, 455561, H04B 336, H04B 714
Patent
active
057521611
DESCRIPTION:
BRIEF SUMMARY
This application claims benefit of international application PCT/Fl94/00424 filed Sep. 22, 1994.
TECHNICAL FIELD
The invention relates to a method for securing the operation of a base station having a radio coverage area divided into at least two sectors, the base station comprising antenna means and at least one channel unit for each sector, which allow the base station to establish a radio connection with active radio transceivers currently located in the sectors of the base station, wherein the base station is provided with an additional channel unit the traffic capacity of which is selectably switchable to one of the base station sectors. The invention also relates to a base station in a radio system, the radio coverage area of the base station being divided into at least two sectors and the base station comprising antenna means and at least one channel unit for each sector, which allow the base station to establish a radio connection with active radio transceivers currently located in the sectors of the base station, the base station further comprising an additional channel unit the traffic capacity of which is selectably switchable to one of the base station sectors.
As used herein, the term antenna means refers not only to the antenna required for transmission and reception but also to the means that connect the antenna attachments of a channel unit to the antenna of the base station. Such means include a combiner means, which combines signals transmitted by channel units intended to be used in the same sector before they are applied to the antenna, and a branching means, which filters and amplifies signals received by the antenna of a specific sector and branches them to the receivers of different channel units.
TECHNICAL BACKGROUND ART
Finnish Patent Application 911 199 discloses a solution where an additional channel unit is connected to a sectored base station in a cellular radio system. The additional channel unit can be connected to a sector that instantaneously needs additional capacity. In this solution, the additional channel unit is connected so that its transmitter can be switched by a relay switch to a combiner means belonging to the antenna means of the selected sector. On the contrary, the reception side of the additional channel unit is implemented such that signals received from different sectors are combined by a combiner means and applied to the receiver of the additional channel unit. Accordingly, signals received from each sector of the base station are thus continually applied to the receiver of the additional channel unit.
The solution according to Finnish Patent Application 911 199, where signals from each sector of the base station are applied continually to the additional channel unit, has several drawbacks, the most severe being: sectors fails in such a way that the antenna attachment of the receiver of the failed channel unit forwards signals interfering with the other channel units of the base station; this interference may render all of the receivers of the base station inoperative, as the receiver of the failed channel unit is still connected to the other receivers of the base station through the combiner means of the reception side; fact that the additional channel unit is permanently connected to all of the sectors of the base station so that it also gathers interferences and background noise from within all sectors. In the worst case, it may happen that a signal received by the receiver of the additional channel unit from a cell of another mobile radio network covers a desired signal or at least substantially deteriorates the quality of the connection (the solution does not follow the frequency re-use scheme that has been made specifically for each sector); which causes a greater attenuation on the signal path, so that the sensitivity of the receivers is impaired.
SUMMARY OF THE INVENTION
The object of the present invention is to avoid the above problems and to provide a method by means of which a failed channel unit of a sectored base station in a cellular
REFERENCES:
patent: 5157667 (1992-10-01), Carusone, Jr. et al.
patent: 5551056 (1996-08-01), Koponen et al.
patent: 5557603 (1996-09-01), Barlett et al.
Patent Abstracts of Japan, vol. 11, No. 271, E-536, Abstract of JP, A, 62-72235 (Oki Electric Ind Co. Ltd), 2 Apr. 1987.
Jantti Arto
Katisko Keijo
Arthur Gertrude
Eisenzopf Reinhard J.
Nokia Telecommunications Oy
LandOfFree
Method and apparatus for replacing a failed channel unit of a se does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for replacing a failed channel unit of a se, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for replacing a failed channel unit of a se will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-995889