Distribution multi-point base station/relay unit in mobile communication system

Abstract

A distributed multi-drop base station / repeating unit using an extension of analog optical transmission in a mobile communication system. The base station unit comprises a main unit for performing functions of a mobile communication base station, and a plurality of remote units cascaded to the main unit on a sector basis. Each of the remote units is adapted to, in a forward mode, receive an analog optical signal, perform a photoelectric conversion operation for the received analog optical signal, split the resulting electrical RF signal into electrical RF signals of two paths, amplify the electrical RF signal of one of the two paths, perform an electrophotic conversion operation for the amplified electrical RF signal, transmit the resulting optical signal, amplify the electrical RF signal of the other path and transmit the amplified electrical RF signal to an associated terminal, and to, in a backward mode, receive an analog optical signal, perform the photoelectric conversion operation for the received analog optical signal, amplify the resulting electrical RF signal, couple the amplified electrical RF signal with its own electrical RF signal, perform the electrophotic conversion operation for the coupled result and transmit the resulting optical signal.

Description

Technical field [0001] The present invention relates to a distributed base station / relay unit in a mobile communication system, and more specifically, to a distributed multipoint base station / relay unit using analog optical transmission expansion in a mobile communication system, wherein multiple remote units or The repeater is connected in series to the base station as the main unit. In this way, the attenuation and loss of the optical signal can be minimized, so that the mobile communication service can be more effectively provided in a wider area. Background technique [0002] It is clear to those skilled in the art that mobile communication service providers recognize that from an economic or technical point of view, the expansion of the coverage of base station services of a mobile communication system is a very important factor. Note that the service coverage of the base station is expanded differently according to a given environment, such as commercial areas, rural areas,...

AI Technical Summary

Problems solved by technology

[0005] However, in the above-mentioned conventional distributed base station / relay unit utilizing analog optical transmission, the optical signal transmitted to the master unit is branched by an optical coupler and then transmitted to a remote unit or repeater, so it suffers from severe attenuation

In addition, the transmit / receive noise figure generated by the optical transducer and fiber optic cable is high to degrade the receive performance

To this end, the optical transmission distance between the main unit and two or more remote units or repeaters is shortened, resulting in distance limitations when two or more remote units or repeaters are connected in series to the main unit

At the same time, the optical transmission distance between the main unit and the remote unit or repeater is shortened, and mobile communication services cannot be provided to users located in tourist attractions far away from the road or at seaside locations far away from the main unit

From the mobile communication service provider's point of view, it is necessary to install a large number of base stations, each of which is a master unit, thereby increasing the economic burden of the mobile communication service provider and causing difficulties in technically managing the base stations

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