A method to reuse base station antennas for the base station to radio network controller connection
Original Publication Date: 2002-Sep-01
Included in the Prior Art Database: 2003-Jul-23
The connection between base stations and the radio network controller is usually made by landlines or microwave connections. However, landlines have the disadvantage of high leased line cost and restricted availability and microwave connections need sepa- rate antenna systems. The acquisition of new Base Transceiver System (BTS) sites or the set up of new antenna elements are quite impossible mainly due to environmental restrictions. Universal Mobile Tele- communications Systems (UMTS) will suffer on this situation.
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A method to reuse base station an-tennas for the base station to radionetwork controller connection
Idee: Michael Färber, München
The connection between base stations and the radionetwork controller is usually made by landlines ormicrowave connections. However, landlines have thedisadvantage of high leased line cost and restrictedavailability and microwave connections need sepa-rate antenna systems. The acquisition of new BaseTransceiver System (BTS) sites or the set up of newantenna elements are quite impossible mainly due toenvironmental restrictions. Universal Mobile Tele-communications Systems (UMTS) will suffer on thissituation.
That is why the following concept is proposed. Tointerconnect the base station of an UMTS system tothe radio network controller, a Time Division Duplex(TDD) system is used which operates in the UMTSTDD spectrum, which is contiguously attached to theUMTS Terrestrial Radio Access (UTRA) FDD coverband. This close allocation allows the reuse of asingle antenna element covering the TDD and FDD(Frequency Division Duplex) frequency band. Inter-ference effects between TDD and FDD are reducedby lowering the TDD TX power. This reduces theside band spill over the FDD band. The link connec-tion allows an engineering of the transmission path,which is optimised for this use. This can be, forexample the clearance of the first Freznelzone andantenna heights significantly above roof top. Fur-thermore, extra high g...