Source: https://patents.google.com/patent/US20100054227A1/en
Timestamp: 2018-10-23 10:53:31
Document Index: 337981438

Matched Legal Cases: ['art 5', 'art 5', 'art 5', 'art 5', 'art 4', 'arts 4', 'arts 4', 'arts 4', 'art 4', 'art 4']

US20100054227A1 - Radio frequency network - Google Patents
Radio frequency network Download PDF
US20100054227A1
US20100054227A1 US12548899 US54889909A US2010054227A1 US 20100054227 A1 US20100054227 A1 US 20100054227A1 US 12548899 US12548899 US 12548899 US 54889909 A US54889909 A US 54889909A US 2010054227 A1 US2010054227 A1 US 2010054227A1
wired distribution
US12548899
US8428033B2 (en )
Heinz-Dieter Hettstedt
Robert Zorad
Gerd Klauke
Ekkehard Schomburg
The present invention relates to radio frequency (RF) distribution systems for mobile communications. In particular, the present invention relates to a radio frequency network facilitating radio communication where the usual free space propagation of electromagnetic waves is hampered, undesired or impossible, for example in tunnels, mines, and buildings and in large complexes like exhibition grounds, shopping malls, and airports. The radio frequency network (1) comprises a distributed antenna system (2) having radiating elements, a wired distribution system (3) feeding the distributed antenna system (2), at least one antenna amplifier (5) between one end of the wired distribution system (3) and the distributed antenna system (2), at least one line amplifier (4) at the other end of the wired distribution system (3), and automatic self-leveling units included in the antenna and line amplifiers (4, 5).
The antenna amplifier 5 feeds the radiating elements (e.g. discrete antennas and/or radiating cables) of the distributed antenna system 2 and provides sufficient output power level to support single- or multi-carriers in downlink, that is from the distributed antenna system for downlink 2 a to mobile terminals (not shown). An automatic level control (not shown) in the antenna amplifier 5 compensates for losses of the passive distribution system 3 between line and antenna amplifiers 4, 5 resulting in a constant output power level independent of RF losses and network topology. In order to provide the desired input power level to the downlink part 5 a of the antenna amplifier 5, the line amplifier 4 is implemented in the network architecture. The line amplifier 4 compensates for losses of the POI 6 and the passive distribution system 3 regulating the input power level to the antenna amplifier 5 to desired power levels suitable for the automatic level control (e.g. by automatic self-leveling units) of the antenna amplifier 5.
In uplink, that is, from the distributed antenna system for uplink 2 b to the POI 6, the RF path works vice versa. Signals are collected by the distributed antenna system for uplink 2 b and fed to the uplink part 5 b of the antenna amplifier 5. An automatic level control (not shown) in the uplink part 5 b of the antenna amplifier 5 adjusts the signals from mobile terminals (not shown) in order to maximize the system dynamic range and optimizes the system performance. As shown in FIG. 1, signals from the distributed antenna system for uplink 2 b are combined and transmitted to the uplink part 5 b of the antenna amplifier 5. Preferably, the signals from the radiating elements of the distributed antenna system for uplink 2 b are passively combined and automatically leveled as well as re-amplified by the antenna amplifier 5. The uplink part 4 b of the line amplifier 4 compensates losses of the passive distribution system 3 between antenna and line amplifiers 4, 5 as well as differences in the received power levels, e.g. from individual floors in case that the shown network is an in-building radio frequency network.
The line and antenna amplifiers 4, 5 shown in FIG. 1 are multi-band amplifiers comprising triplexers 7 and corresponding narrowband amplifiers 8. The architecture of the line and antenna amplifiers 4, 5 as shown in FIG. 1 is designed for a parallel network. That is, the network comprises separate downlink and uplink paths 9, 10 and the amplifiers 4, 5 comprise separate uplink and downlink parts 4 a, 4 b, 5 a, 5 b subdivided into a plurality of frequency bands. Such multi-band amplifiers are applicable for most mobile communication systems where download frequency bands as well as uplink frequency bands can be separated and combined via low cost multiplexers. According to the present invention it is possible to distribute adjacent or overlapping frequency bands for uplink and downlink (e.g. SMR800 and CDMA800) or overlapping frequency bands (e.g. PCS1900 and UMTS2100), for example in an in building mobile communication system. In this case, the combining of downlink/uplink frequency bands via filters to a common port is not possible.
Because of the separation of the distributed antenna system 2 (radiating elements) for uplink and downlink 2 a, 2 b the effort for filtering decreases considerably. Low-cost filter technology (e.g. ceramic filters and duplexers and/or SAW filters) can be used to separate and combine services. That is, separate RF networks are used for uplink and downlink to enable a cost-reduction due to cost-efficient filter technology. Furthermore, the passive network architecture can be adapted to each topology, e.g. in buildings, without reduction of performance.
FIG. 2 shows a block diagram of a second embodiment of a radio frequency network according to the present invention. In comparison with FIG. 1 only the architecture of the line and antenna amplifiers 4, 5 is modified. In case of adjacent or overlapping frequency bands, one uplink and one downlink band are interchanged. Thus, the downlink parts 4 a, 5 a of the amplifiers 4, 5 of FIG. 1 comprise two downlink bands and one uplink band in FIG. 2, whereas the uplink parts 4 b, 5 b of the amplifiers 4, 5 of FIG. 1 comprise two uplink bands and one downlink band in FIG. 2. In other words, one amplifier part 4 a, 5 a amplifies two downlink bands and one uplink band and vice versa for the second amplifier part 4 b, 5 b, which transmits two uplink frequency bands and one downlink band over the distribution system 3. This anti-parallel architecture according to the second embodiment of the present invention again allows for the use of low cost filter technology due to the separation of frequency bands that are critical to combine. That is, the anti-parallel architecture allows for distribution of bordering or overlapping frequency bands without the use of high performance filters and multiplexers. In particular, the physical separation of radiating elements (not shown) of the distributed antenna system 2 provides sufficient isolation between adjacent or overlapping frequency bands taken into account at decoupling of radiating elements. The modular design of the active elements as described with respect to FIGS. 1 and 2 allows for an easy network design independently of the frequency spectrum of required mobile services.
a distributed antenna system having radiating elements,
a wired distribution system feeding the distributed antenna system,
at least one antenna amplifier between one end of the wired distribution system and the distributed antenna system,
at least one line amplifier at the other end of the wired distribution system, and
6. A method for signal transmission within a radio frequency network, the network comprising a distributed antenna system having radiating elements and a wired distribution system feeding the distributed antenna system, and the method comprising the steps of:
amplifying upload and download signals in at least one antenna amplifier arranged between one end of the wired distribution system and the distributed antenna system, amplifying the upload and download signals in at least one line amplifier arranged at the other end of the wired distribution system, and automatically self-leveling of signals transmitted within the wired distribution system in the antenna and line amplifiers by means of self-leveling units.
US12548899 2008-08-28 2009-08-27 Radio frequency network Active 2031-06-01 US8428033B2 (en)
EP08290805 2008-08-28
EP20080290805 EP2159933B1 (en) 2008-08-28 2008-08-28 Levelling amplifiers in a distributed antenna system
EP08290805.4 2008-08-28
US20100054227A1 true true US20100054227A1 (en) 2010-03-04
US8428033B2 US8428033B2 (en) 2013-04-23
ID=40352673
US12548899 Active 2031-06-01 US8428033B2 (en) 2008-08-28 2009-08-27 Radio frequency network
US (1) US8428033B2 (en)
EP (1) EP2159933B1 (en)
CN102833010A (en) * 2012-08-10 2012-12-19 武汉虹信通信技术有限责任公司 Passive intermodulation improvement method for base station signals of mobile communication system
CN102281109A (en) * 2010-06-08 2011-12-14 佳律通信设备(上海)有限公司 Optical fiber system is a multi-access system
EP2495882A1 (en) * 2011-02-28 2012-09-05 Alcatel Lucent Distributed antenna system
KR101868965B1 (en) 2014-12-30 2018-06-19 주식회사 쏠리드 Remote apparatus of distributed antenna system
US5737687A (en) * 1995-03-01 1998-04-07 Qualcomm Incorporated Self-attenuating RF transceiver system using antenna and modem interfaces and cable link
US6801788B1 (en) 1997-09-09 2004-10-05 Samsung Electronics Co., Ltd. Distributed architecture for a base station transceiver subsystem having a radio unit that is remotely programmable
EP1860803A1 (en) 2006-05-22 2007-11-28 Alcatel Lucent Method and system for optical transmission signal level configuration
CN102833010B (en) * 2012-08-10 2016-06-29 武汉虹信通信技术有限责任公司 A mobile communication system, base station signal passive intermodulation method for improving
EP2159933B1 (en) 2013-03-27 grant
US8428033B2 (en) 2013-04-23 grant
EP2159933A1 (en) 2010-03-03 application
US6983174B2 (en) 2006-01-03 Distributed active transmit and/or receive antenna
US20110268449A1 (en) 2011-11-03 Sectorization in Distributed Antenna Systems, and Related Components and Methods
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HETTSTEDT, HEINZ-DIETER;ZORAD, ROBERT;SCHROEDER, AXEL;AND OTHERS;SIGNING DATES FROM 20080924 TO 20080925;REEL/FRAME:023159/0566