`Fischer et al.
`
`US005642405A
`Patent Number:
`11
`45 Date of Patent:
`
`5,642,405
`Jun. 24, 1997
`
`54 CELLULAR COMMUNICATIONS SYSTEM
`WITH CENTRALIZED BASE STATIONS AND
`DSTRIBUTED ANTENNA UNTS
`
`75) Inventors: Larry G. Fischer; Philip M. Wala;
`Jeffrey Brennan, all of Waseca, Minn.
`73 Assignee: ADC Telecommunications, Inc.,
`Bloomington, Minn.
`
`21 Appl. No.: 298,652
`22 Filed:
`Aug. 31, 1994
`Related U.S. Application Data
`60 Division of Ser. No. 204,660, Mar. 2, 1994, Pat. No.
`5,627,879, which is a continuation-in-part of Ser. No. 183,
`221, Jan. 14, 1994, abandoned, which is a continuation-in
`part of Ser. No. 68,389, May 28, 1993, abandoned, which is
`a continuation-in-part of Ser. No. 946,402, Sep. 17, 1992,
`abandoned, Ser. No. 946,964, Sep. 17, 1992, abandoned,
`Ser. No. 946,931, Sep. 17, 1992, abandoned, and Ser. No.
`946,548, Sep. 17, 1992, abandoned.
`[51] Int. Cl. .................... H04Q 7/22
`I52 U.S. Cl. ........................... 379/60; 379/59; 455/33.1;
`455/33.2; 455/33.3; 455/33.4
`58 Field of Search ............................. 379/58, 59, 60,
`379/63; 455/33.1, 33.2, 54.1, 54.2, 56.1,
`33.4
`
`56
`
`References Cited
`U.S. PATENT DOCUMENTS
`4,144,409 3/1979 Utano et al. ....................... 455/334 X
`4,144,411
`3/1979 Frenkiel .......
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`4,456,793
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`(List continued on next page.)
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`Japan.
`OTHER PUBLICATIONS
`"Kentrox boosts coverage and capacity" Steven Titch, News
`Editor, Telephony/Jan. 25, 1993.
`"New Microcell Technology Sets Cellular Carriers Free",
`David Russell, Telephony Mar. 1993.
`"ADC Kentrox Introduces CITYCELL 824, A Replacement
`For conventional Cell Sites; Company's Original Goal Was
`To Improve Fiber Optic T1 Links Between Cells, MTSOs”,
`Telocator Bulletin, Feb. 1993.
`"Digital transport for cellular", Microwaves & RF, Feb.
`1993.
`
`(List continued on next page.)
`Primary Examiner Curtis Kuntz
`Assistant Examiner-G. J. Oehling
`Attorney, Agent, or Firm-Schwegman, Lundberg, Woess
`ner & Kluth, PA.
`ABSTRACT
`57
`A microcellular communications network includes a plural
`ity of base station units and corresponding antenna units.
`Each includes either conventional transmitters and receivers
`or all digital transmitter and receiver equipment, and inter
`face circuitry to a mobile telecommunications Switching
`office. The microcell traffic output is applied to a frame
`generator/multiplexer. The output of the frame generator/
`multiplexer is applied to a digitally modulated laser and
`conveyed by fiber to a remote antenna unit, which demul
`tiplexes the microcell traffic signal, applies it to a digital
`to-analog converter, and applies it to a power amplifier and
`a main antenna. The received signals are filtered, digitized,
`multiplexed together and transmitted over the optical fiber
`back to the base station. The strongest signal is selected for
`use. Deployment of an all digital microcellular communi
`cations system occurs in two stages. Digital filtering of the
`digitized RF signal is also provided, and a digital passive
`handoff system provides for an FFT analysis of all traffic in
`the cell and passive switching in response thereto.
`
`3 Claims, 58 Drawing Sheets
`
`
`
`5,642,405
`Page 2
`
`U.S. PATENT DOCUMENTS
`4,475,010 10/1984 Huensch et al..
`4,485,486 11/1984 Webb.
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`7/1985 Freeburg.
`4,556,760 12/1985 Goldman.
`4,613,990 9/1986 Halpern.
`4,669,107 5/1987 Eriksson-Lennartsson.
`4,759,051
`7/1988 Han.
`4,790,000 12/1988 Kinosita.
`4,797,947
`1/1989 Labedz.
`4,831,662 5/1989 Kuhn ...................................... 455/608
`4,916,460 4/1990 Powell.
`4,932,049 6/1990 Lee.
`5,067,147 11/1991 Lee.
`5,067,173 11/1991 Gordon et al..
`5,084,869
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`5,175.867. 12/1992 Weike et al..
`5,193,109 3/1993 Lee ............................................ 379/60
`5,243,598 9/1993 Lee ........................................ 379/60 X
`5,251,053 10/1993 Heidemann.
`5,267,261 11/1993 Blakeney, II et al. .
`5,278,690
`1/1994 Vella-Coleiro.
`5,280,472
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`5,285,469 2/1994 Vanderpool.
`5,297,193 3/1994 Bouix et al. .............................. 379/63
`5,301,056 4/1994 O'Neill.
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`5,305,308 4/1994 English et al..
`5,309,474 5/1994 Gilhousen et al. .
`5,339,184 8/1994 Tang ........................................ 359/124
`5,381,459
`1/1995 Lappington ............................... 379/56
`5,392,453 2/1995 Gudmundson et al. ............... 455/33.2
`OTHER PUBLICATIONS
`ADC Kentrox Wireless System Group CityCellTM 824-A
`positioning white paper. (Mar. 1993) CITATrade Show.
`Broadband Optical Transport Digital Microcell Connection
`Service-Interface and Performance Specifications. A tech
`nical description of the User-Network Interface and perfor
`mance specification for Amaurotic Digital Microcell Con
`nection Service. To: Amaurotic and Vendor Community. AM
`TR-NIS 000117. Issue 1, Dec. 1993.
`ZoneMaster-Maximum Coverage for High-Capacity
`Locations. Decibel Multi-MicroCELLSystems (Feb. 1993).
`Personal Wireless. Special Report/Communications, IEEE
`Spectrum (Jun. 1993).
`
`
`
`Fiber Optic Antenna Remoting for Multi-Sector Cellular
`Cell Sites. Douglas D. Tang GTE Laboratories-Abstract
`(Conference Jun. 14-18, 1992).
`Urban Microcell System Layout. GTE Laboratories (Con
`ference Jun. 14-18, 1992).
`A Radio System Proposal Widespread Low-Power Tether
`less Communication, Donald C. Cox, IEEE, vol. 290, No. 2
`(Feb., 1991), pp. 328-329.
`Land Mobile Radio Systems-A Tutorial Exposition, S.C.
`Gupta, IEEE, vol. 23 No. 6, (Jun. 1985) pp. 34-41.
`Prof. R. Steele, B.Sc., Ph.D., D.Sc., C. Eng., Sen. Mem.
`LE.E.E., M.I.E.E. "Towards a High Capacity Digital Cellu
`lar Mobile Radio System", IEEE Proceedings, vol. 132,
`Pt.F., No. 5, Aug. 1985.
`“ZoneMasterTM-Maximum Coverage For High-Capacity
`Locations". Decibel MultiMedia MicroCELL System. Four
`pages. 1993 Decibel Products. 2-83-5M.
`“And now a few words from your Customers . . . " Four
`pages. ADC KentroxO A Subsidiary of ADC Telecommu
`nications, Inc. Aug. 1992-4069.
`News Release--"First Field Trial Results Exceeds Expec
`tations” (Mar. 2, 1993).
`News Release-'ADC Kentrox Introduces Innovative Wire
`less Network Access Solution” (Mar. 1, 1993).
`City Cell, Cellular Industry The Day Group, "ADC Kentrox
`CityCell Field Trial Yields Another First: Simultaneous
`Analog and Digital Calls,” (1 page).
`"A Two-Way Wavelength-Division-Multiplexing Trans
`mission and its Application to a Switched TV Distribution
`System.” Electrical Communication Laboratories, Nipon
`Telegraph & Telephone Public Corporation, Yokosuka,
`Japan and Technical Bureau, Nippon Telegraph & Telephone
`Public Corporation, Tokyo, Japan, Hideki Ishio, et al. (10
`pages).
`Microwaves & RF, Mar. 1993, "Offshore Markets Gain in
`Size, Competitiveness, Even the smallest industry compa
`nies are expanding their global business, despite such costly
`distractions as ISO 9000." (1 page).
`News Release-'ADC Kentrox Introduces Innovative Wire
`less Network Access Solution Cellular Subscribers Offered
`a New Level of Portable Services.” ADC Kentrox, Mar. 1,
`1993 (3 pages).
`
`
`
`U.S. Patent
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`Jun. 24, 1997
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`Sheet 28 of 58
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`Jun. 24, 1997
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`Jun. 24, 1997
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`Jun. 24, 1997
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