US008346091B2
`
`US 8,346,091 B2
`(10) Patent No.:
`a2) United States Patent
`Kummetz et al.
`(45) Date of Patent:
`Jan. 1, 2013
`
`
`(54) DISTRIBUTED ANTENNA SYSTEM FOR
`WIRELESS NETWORK SYSTEMS
`
`(75)
`
`Inventors: Thomas Kummetz, Forest, VA (US);
`Donald McAllister, Lynchburg, VA
`(US); Carmine Pagano, Blairstown, NJ
`(US); Hongju Yan, Morganville, NJ
`(US); Dennis M. Cleary, Pittsford, NY
`(US); Van Hanson, Forest, VA (US);
`Mathias Schmalisch, Augsburg (DE);
`Stefan Eisenwinter, Buchdorf (DE)
`
`5,657,374 A
`5,761,619 A
`5,809,422 A
`5,852,651 A
`6.205.133 Bl
`6,259,910 BI*
`6,704,545 Bl
`6,801,767 B1*
`
`Russell et al.
`8/1997
`6/1998 Danne et al.
`9/1998
`Raleigh et al.
`12/1998
`Fischer et al.
`3/2001
`Bexten
`7/2001
`Fairfield et al. ....... 455/422.1
`3/2004 Wala
`10/2004
`Schwartz et al.
`(Continued)
`
`.......... 455/426.2
`
`wo
`
`FOREIGN PATENT DOCUMENTS
`03079645 A2
`9/2003
`
`(73)
`
`Assignee: Andrew LLC, Hickory, NC (US)
`
`(Continued)
`
`(*)
`
`Notice:
`
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`US.C. 154(b) by 843 days.
`
`(21)
`
`Appl. No.: 12/431,872
`
`OTHER PUBLICATIONS
`
`Nine-page International Search Report and Written Opinion mailed
`
`Sep. 1, 2010 for Application No. PCT/US2010/028478.
`
`(22)
`
`Filed:
`
`Apr. 29, 2009
`
`Primary Examiner — Kenneth N Vanderpuye
`
`(65)
`
`(51)
`
`(52)
`
`(58)
`
`(56)
`
`D010
`2010/0278530 Al
`
`US
`
`Prior Publication Data
`4
`
`Nov.
`
`4, 2010
`
`Int. Cl.
`(2006.01)
`H04B 10/24
`(2006.01)
`H04B 10/02
`(2006.01)
`HO4B 7/02
`(2006.01)
`HO4S 14/02
`(2006.01)
`HOAL 27/00
`US. Ch oe 398/ aan a eee me ton
`.
`;
`.
`3
`;
`;
`Field of Classification Search ............ 398/15-117;
`455/3.01, 3.03-3.05, 403, 422.1-426.2
`ae
`.
`See application file for complete search history.
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`
`5,621,786 A
`5,627,879 A
`5,642,405 A
`5,644,622 A
`
`4/1997
`5/1997
`6/1997
`7/1997
`
`Fischer et al.
`Russell et al.
`Fischer et al.
`Russell et al.
`
`Assistant Examiner — Tanya Ngo
`(74) Attorney, Agent, or Firm — Kilpatrick Townsend &
`Stockton LLP
`
`(57)
`
`ABSTRACT
`
`A distributed antenna system is provided for communicating
`with a plurality of base stations. The distributed antenna
`system includes a system controller and a master unit com-
`municating with at least one of the plurality of base stations.
`A remote unit communicates over a high data rate media with
`the master unit and/or a downstream remote unit. Alterna-
`
`tively, the distributed antenna system includes a controller
`and a digital time/space crosspoint switch controlled by the
`controller. A digitizing transceiver is in communication with
`the digital time/space crosspoint switch. The crosspoint
`switch is configured to transmit and receive digital data
`through the digitizing transceiver.
`
`29 Claims, 20 Drawing Sheets
`
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`Page 1
`
`CommScope Ex. 1020
`
`

`

`US 8,346,091 B2
`Page 2
`
`
`U.S. PATENT DOCUMENTS
`6,937,878 B2
`8/2005
`Kimetal.
`6,963,552 B2
`11/2005.
`Sabat, Jr. et al.
`ened BS
`4006 coum
`1039,
`ales Br
`NON 3oy BD
`Lda BO
`ATL,
`ae BS
`TN
`7'630°296 B2
`Wee8'133 B2
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`7305073 BO*
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`gigentus
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`Ban
`etal
`6/000
`1/0007 Bauman et
`
`al
`
`lopues ~ue
`12/2009 _Zavadsky etal
`2/2010 Faved
`bly Ce eal
`9/0010 Suen a.
`72011
`Precmel
`
`3089/5
`
`8,175,459 B2*
`2003/0007502 Al*
`2003/0185571 Al
`2004/0106435 Al
`2004/0132474 Al
`2004/0203339 AL*
`2004/0223539 Al*
`2005/0123301 Al
`2005/0182760 Al*
`
`
`w 398/115
`-. 370/463
`
`
`.
`Thelen etal.
`5/2012
`Dove etal. ....
`1/2003
`Lee et al.
`10/2003
`6/2004 Bauman et al.
`7/2004 Wala
`10/2004 Bauman ....ccccccsssseeeen 4557
`11/2004 Yang
`375/148
`6/2005.
`Kallstenius
`8/2005
`Leeet al. vecccscssssseen 707/3
`
`2007/0008939 Al*
`2007/0117592 Al*
`5007/0160012 AL
`5007/0195005 Al
`2007/0264009 Al*
`2007/0286599 Al
`2008/0145061 Al
`2008/0181282 Al
`2008/0240225 Al
`2008/0242232 Al*
`2009/0075644 Al
`2009/0252205 A1*
`2010/0040372 A1*
`2010/0178936 A1*
`20100266287 Al*
`2011/0045787 Al*
`
`370/338
`. 455/562.1
`
`Fischer .....
`1/2007
`5/2007 Bauman ....
`7/2007
`Liu
`8/2007
`Schaty
`11/2007 Sabat et al. cceccccssesseee 398/5
`12/2007
`Sauer et al.
`6/2008
`Lee etal.
`7/2008
`Wala etal.
`10/2008 Zavadsky et al.
`10/2008 Zavadsky et al. ........ 455/67.11
`3/2009 Hermel
`10/2009 Rheinfelder etal.
`....... 375/219
`2/2010 Gejbrowitz et
`al... 398/71
`
`7/2010 Walaetal. ......
`455/456.2
`398/116
`10/2010
`Adhikari et al.
`. 455/1143
`2/2011
`Jinetal.
`
`
`FOREIGN PATENT DOCUMENTS
`
`Wo
`Wo
`wo
`wg
`Wo
`
`2004051322 A2
`vee eOli tat Al
`5008034844 AL
`500800028) AI
`s008136811 AL
`
`— 6/2004
`ae
`4/2008
`10/2008
`12/2006
`
`— * cited by examiner
`
`Page 2
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`U.S. Patent
`
`Jan. 1, 2013
`
`Sheet 1 of 20
`
`US 8,346,091 B2
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`Page 3
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`CommScope Ex. 1020
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`U.S. Patent
`
`Jan. 1, 2013
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`Sheet 2 of 20
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`US 8,346,091 B2
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`U.S. Patent
`
`Jan. 1, 2013
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`Sheet 3 of 20
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`US 8,346,091 B2
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`

`U.S. Patent
`
`Jan. 1, 2013
`
`Sheet 4 of 20
`
`US 8,346,091 B2
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`Page 6
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`U.S. Patent
`
`Jan. 1, 2013
`
`Sheet 5 of 20
`
`US 8,346,091 B2
`
`98
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`Page 7
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`U.S. Patent
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`Jan. 1, 2013
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`Sheet 6 of 20
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`US 8,346,091 B2
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`CommScope Ex. 1020
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`

`

`U.S. Patent
`
`Jan. 1, 2013
`
`Sheet 7 of 20
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`US 8,346,091 B2
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`
`CommScope Ex. 1020
`
`

`

`U.S. Patent
`
`Jan. 1, 2013
`
`Sheet 8 of 20
`
`US 8,346,091 B2
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`CommScope Ex. 1020
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`

`U.S. Patent
`
`Jan. 1, 2013
`
`Sheet 9 of 20
`
`US 8,346,091 B2
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`CommScope Ex. 1020
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`

`

`U.S. Patent
`
`Jan. 1, 2013
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`
`
`Sheet 10 of 20
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`US 8,346,091 B2
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`

`U.S. Patent
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`Jan. 1, 2013
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`
`Sheet 11 of 20
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`US 8,346,091 B2
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`CommScope Ex. 1020
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`

`U.S. Patent
`
`Jan. 1, 2013
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`
`
`Sheet 12 of 20
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`US 8,346,091 B2
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`Jan. 1, 2013
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`US 8,346,091 B2
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`

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`U.S. Patent
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`Jan. 1, 2013
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`US 8,346,091 B2
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`CommScope Ex. 1020
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`

`

`U.S. Patent
`
`Jan. 1, 2013
`
`Sheet 15 of 20
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`US 8,346,091 B2
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`U.S. Patent
`
`Jan. 1, 2013
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`
`
`Sheet 16 of 20
`
`US 8,346,091 B2
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`CommScope Ex. 1020
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`

`

`U.S. Patent
`
`Jan. 1, 2013
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`
`
`Sheet 17 of 20
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`US 8,346,091 B2
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`U.S. Patent
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`Jan. 1, 2013
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`Sheet 18 of 20
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`US 8,346,091 B2
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`CommScope Ex. 1020
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`

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`U.S. Patent
`
`Jan. 1, 2013
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`Sheet 19 of 20
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`US 8,346,091 B2
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`Page 21
`
`CommScope Ex. 1020
`
`

`

`U.S. Patent
`
`Jan. 1, 2013
`
`Sheet 20 of 20
`
`US 8,346,091 B2
`
`OPTIONAL DEDICATED
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`FIG. 16
`
`Page 22
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`CommScope Ex. 1020
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`

`

`US 8,346,091 B2
`
`1
`DISTRIBUTED ANTENNA SYSTEM FOR
`WIRELESS NETWORK SYSTEMS
`
`FIELD OF THE INVENTION
`
`The present invention is directed to wireless transceiver
`systems for use in wireless communication systems, and spe-
`cifically is directed to a distributed antenna system for the
`wireless transceiver system.
`
`BACKGROUND OF THE INVENTION
`
`Contemporary cellular phone systems and broadband
`wireless metropolitan networks 20, as shown in FIG. 1, are
`generally divided into a number of cells 22 distributed in a
`pattern to preclude co-channel interferences and provide cov-
`erage of mobile and fixed subscriber units operating within
`the service area of the system. Each cell 22 includes a base
`station 24 that employs radio frequency (RF) transceiver
`equipment, antennas 26, and wire line 28 communication
`equipment. Mobile/fixed subscriber units 30 within the geo-
`graphic area of the cell site use RF transceiver equipment to
`communicate with RF transceivers within the base station 24.
`The base station 24 relays voice and data traffic to/from the
`subscriber mobile units or devices (e.g. a phone) 30 and
`to/from a Mobile Telephone Switching Office 32 or Access
`Service Gateway which in turn are connected to a central
`network such as the public switched telephone network
`(PSTN) 34 or packet switched networks such as the Internet,
`for example.
`To improve the capacity ofa base station 24 to handle more
`mobile users 30, cells 22 may be divided into sectors 38 or are
`further subdivided into smaller cells with the base station 24
`being replaced with lower cost, reduced capability micro or
`pico cells 36. In some configurations, distributed antenna
`systems (DAS) may be employed to optimize the RF distri-
`bution in larger cells in order to increase capacity at an even
`lower cost than with pico and/or micro cells 36. These
`approaches permit the reuse of a limited number of expensive
`RF channels without incurring the costs of one or more com-
`plete base stations 24. Further, these techniques may also be
`used to extend coverage to areas within the cell site where RF
`propagation may be limited by obstruction, such as in build-
`ings and tunnels, or to areas where the amount of traffic
`(revenue) does not justify the investment required for a com-
`plete base station 24. Distributed antenna systems allow the
`RF coverage to be adapted to the specific environment in a
`homogeneous way to assist in reducing the amount of intro-
`duced interference. In addition, the amount of extra traffic is
`kept low as only existing cells are distributed and no hand-off
`between cells is required.
`In order to reduce the costs associated with the develop-
`ment of their communication systems, multiple service pro-
`viders often locate their base stations 24 at the same geo-
`graphical point. The providers can then share such items as
`antennas, antenna towers, primary power drops, land costs,
`and regulatory costs. These service providers may employ
`multiple RF bands, multiple channels within the same RF
`band and multiple air interface standards (e.g. CDMA,
`UMTS, TDMA, and WiMax). The cost for each service pro-
`vider to extend coverage to increase capacity by deploying
`their own micro/pico cells and/or distributed antennas may be
`quite high. Further in some areas where RF propagation is
`poor, such as sporting venues or shopping malls, the owners
`of such facilities may not permit the installation of such
`equipment by multiple service providers for aesthetic reasons
`or because of space limitations.
`
`20
`
`25
`
`30
`
`35
`
`40
`
`45
`
`50
`
`55
`
`60
`
`65
`
`2
`Therefore, there is a need in the art for a system that maybe
`used by multiple service providers to extend coverage and
`increase capacity.
`
`SUMMARY OF THE INVENTION
`
`Embodiments of the present invention provide a distrib-
`uted antenna system (“DAS”) that can be used by multiple
`wireless service providers to increase the capacity and the
`coverage area of multiple communication systems without
`the need for each provider to incur the cost of deploying one
`or more micro /pico cells or DAS. To that end, embodiments
`of the invention are capable of simultaneously distributing
`signals between collocated base stations, operated by mul-
`tiple service providers, and remote or fixed subscriber units.
`The signals may encompass multiple RF bands, multiple
`channels within those bands, and multiple air interface stan-
`dards. Embodiments of the invention may provide to wireless
`service providers a solution that, when compared to micro
`cells or pico cells, allows them to cover certain environments
`at a lower cost with similar or even improved signal quality.
`Some embodiments of the distributed antenna system
`include a system controller and a master unit communicating
`with at least one of a plurality of base stations. Remote units
`communicate over a high data rate media with the master unit
`and/or another upstream or downstream Remote unit. In some
`embodiments, the remote unit communicates over a digitally
`modulated optical channel with the master unit and/or other
`remote units.
`In other embodiments, the distributed antenna system
`includes a controller and a digital time/space crosspoint
`switch controlled by the controller. A digitizing transceiver is
`in communication with the digital time/space crosspoint
`switch. The crosspoint switch is configured to transmit and
`receive digital data through the digitizing transceiver.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`The accompanying drawings, which are incorporated in
`and constitute a part of this specification, illustrate embodi-
`ments of the invention and, together with a general descrip-
`tion of the invention given above, and the detailed description
`given below, serve to explain the invention.
`FIG. 1is a block diagram, ofa contemporary cellular phone
`system and broadband wireless metropolitan network.
`FIG. 2A is a block diagram of the cellular phone system
`and broadband wireless metropolitan network of FIG. 1
`employing an embodiment of the invention.
`FIG. 2B is a detailed view of a portion of FIG. 2A.
`FIG. 3 is a detailed block diagram of one embodiment of
`the invention.
`FIG. 4 is a detailed block diagram of a Master Unit used in
`embodiments of the invention.
`FIG. 5 is a block diagram of a TDD switch used in some
`embodiments of the invention.
`portion
`FIGS. 6A and 6B are a detailed block diagram ofa
`of a Remote Unit utilized in embodiments of the invention.
`FIGS. 7A and 7B are a detailed block diagram ofa
`portion
`of an alternate Remote unit utilized in embodiments of the
`invention.
`FIG. 8 is a detailed block diagram of an embodiment of the
`invention including an Extension Unit.
`FIG. 9
`is
`a detailed block diagram of a portion of the
`Extension unit of FIG. 8.
`FIGS. 10A and 10B are a detailed block diagram of a
`portion of an alternate Master Unit utilized with embodi-
`ments of the invention.
`
`Page 23
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`

`US 8,346,091 B2
`
`3
`a detailed block diagram of a cellular phone
`FIG. 11 is
`system and broadband wireless metropolitan network accord-
`ing to one of the embodiments of the invention.
`FIGS. 12A and 12B are a detailed block diagram of a
`portion of another Master Unit similar to that of FIGS. 10A
`and 10B utilized with embodiments of the invention.
`FIG. 13 is an alternate exemplary embodiment of a remote
`unit, such as in FIGS. 6A-6B and 7A-7B utilizing a digital
`crosspoint switch.
`FIG. 14 is a block diagram of a master and remote/exten-
`sion units employing digital crosspoint switched.
`FIG. 15A