(19) United States
`(12) Patent Application Publication (10) Pub. No.: US 2007/0177552 A1
`Wu et al.
`(43) Pub. Date:
`Aug. 2, 2007
`
`US 20070177552A1
`
`(54) DISTRIBUTED BASED STATION SYSTEM
`AND METHOD FOR NETWORKING
`THEREOF AND BASE BAND UNIT
`(76) Inventors: Wangjun Wu, Guangdong (CN);
`Chengdong Yu, Guangdong (CN); Zhu
`Tan, Guangdong (CN); Tao Pu,
`Guangdong (CN); Wensheng He,
`Guangdong (CN); Peng Lan,
`Guangdong (CN); Jun Zhou,
`Guangdong (CN); Ming Yu,
`Guangdong (CN)
`Correspondence Address:
`LADAS & PARRY LLP
`224 SOUTH MICHGANAVENUE
`SUTE 16OO
`CHICAGO, IL 60604 (US)
`(21) Appl. No.:
`10/589,323
`
`(22) PCT Filed:
`(86). PCT No.:
`
`Jan. 12, 2006
`PCT/CNO6/OOO44
`
`S 371(c)(1),
`(2), (4) Date: Feb. 9, 2007
`
`
`
`(30)
`
`Foreign Application Priority Data
`
`Jan. 12, 2005 (CN).............................. 20051OOO1936.7
`May 19, 2005 (CN).............................. 200510070835.5
`
`Publication Classification
`
`(51) Int. Cl.
`(2006.01)
`H04B 7/26
`(52) U.S. Cl. .............................................................. 370/335
`
`(57)
`
`ABSTRACT
`
`The present invention discloses a distributed base station
`system as well as its networking method and base band unit.
`In this system, the base band unit (BBU) and RF unit (RFU)
`of the base station are separated, and the RFU is equipped
`with base band RF interfaces for interconnecting the BBU
`and transmitting data information, thereby forming the base
`station. Based on the separation of the BBU from the RFU,
`the BBU capacity is further divided at the same time, and
`every unit is also arranged independently. The BBU net
`working and capacity expansion may be achieved with
`capacity expansion interfaces and base band RF interfaces
`provided by BBU interface units in flexible and convenient
`ways.
`
`BBU
`interconnection
`
`baseband RF one or plural
`interface
`near RFU(s)
`
`baseband RF
`interface
`
`one or plural
`RRU(s)
`
`

`

`Patent Application Publication Aug. 2, 2007 Sheet 1 of 9
`
`US 2007/0177552 A1
`
`US 2007/0177552 Al
`................................,
`
`RNC
`Patent Application Publication Aug. 2,2007 Sheet 1 of 9
`base station and
`BSC interface - - -
`RNC
`;
`base station and
`BSCinterface
`(
`)
`
`up/down baseband signal
`processing unit
`up/down basebandsignal
`processing unit
`
`baseband part
`basebandpart
`
`Fig.1
`Fig.1
`
`
`
`BBU
`BBU
`interconnection
`
`baseband RF one or plural
`baseband RF)
`oneor plural
`interface
`near RFU(s)
`near RFU(s)
`
`baseband RF
`interface
`interface
`
`one or plural
`one or plural
`RRU(s)
`
`Fig.2
`Fig.2
`
`Interface
`unit
`te
`interf:
`interface
`
`Main
`Processing &
`Timing unit
`Main
`Processing &
`Timing unit
`
`i
`:
`
`:
`
`:
`
`iN
`
`power
`amplifier unit:
`
`f
`
`IF signal processing
`IF signal processing
`unit
`
`i
`
`:
`
`7S unit
`RRU(s)
`
`

`

`Patent Application Publication Aug. 2, 2007 Sheet 2 of 9
`
`US 2007/0177552 A1
`
`Patent Application Publication Aug. 2,2007 Sheet 2 of 9
`transmission of synchronous clock signal
`
`
`US 2007/0177552 Al
`
`
`
`transmission of synchronousclock signal
`baseband
`lub intedface
`signal
`transmission
`processing
`baseband
`
`unit
`unit
`
`
`signal
`processing!
`
`interface
`unit
`
`baseband information
`capacity
`unit
`:
`
`expansion
`i interface |
`
`
`
`interface
`capacity
`baseband information
`unit
`i
`
`
`expansion
`interface
`
`master control
`Main processing unit
`
`signal
`master control
`signal
` Main processing unit
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`BBU
`BBU
`
`Fig.3
`Fig.3
`
`ESD
`ESd
`connector
`connector
`
`BBUboradslot
`BBUbonadslot
`
`GPS signal input Bits signal input
`C24
`
`Dry contact
`dentification. "P"
`inter
`nterface
`
`
`
`Eib capaciteia capacity high speed high speed high speed
`?
`._.
`HEib capaci
`ia capaci
`high speed
`g
`le
`expansion
`ital
`digital
`digital
`ransmissio
`ansmissio\
`expansion
`expansion
`digital
`
`interface interface|{interface |interface
`
`interfac
`interface
`interface linterface2 interface 3
`interface
`terface
`
`
`
`
`
`PGND terminal
`PGND terminal
`
`TTI est
`interface
`Test
`interface
`
`1 OM test
`interface
`OM test
`interface
`
`Fig.4
`Fig.4
`
`

`

`Patent Application Publication Aug. 2, 2007 Sheet 3 of 9
`
`US 2007/0177552 A1
`
`Patent Application Publication Aug. 2,2007 Sheet 3 of 9
`transmission of synchronous clock signal
`
`US 2007/0177552 Al
`
`BBU2
`
`BBW
`
`RRU
`
`transmission
`-
`transmlSSIOI
`processing unit
`processing unit
`
`Receipt
`Receipt
`processing unit
`processing unit
`
`Fig.6
`
`
`transmission of synchronousclock signal
`baseband
`signal
`processor
`baseband
`unit
`signal
`processor
`unit
`
`:
`
`processing unit
`processing unit
`
`information
`
`Fig.5
`
`transmission
`
`uni
`
`Receipt
`processing unit
`
`
`
`transmission
`unit
`
`baseband
`signal
`signal
`processor
`processor
`unit
`
`Main processing unit
`
` processing
`Mainprocessing unit
`
`

`

`Patent Application Publication
`
`Aug. 2,2007
`
`Sheet 4 of 9
`
`US 2007/0177552 Al
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`BBUI
`
`<i} >}
`
`
`
`
`
`
`
`
`
`
`Fig.7 (a)
`
`
`
`
`
`| —]_ RRU
`
`
`
`
`
`RRU
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`BBUI
`
`
`
`
`
`BBU2
`
`
`
`Fig.7 (b)
`
`
`
`
`
`
`
`
`
`
`
`
`
`RRU
`
`
`
`
`RRU
`
`
`
`
`RRU
`
`
`
`BBU
`
`
`
`
`
`Fig.7(c)
`
`Page 5
`
`CommScope Ex. 1042
`
`
`
`

`

`Patent Application Publication
`
`Aug. 2,2007
`
`Sheet 5 of 9
`
`US 2007/0177552 A1
`
`Sectorl
`
`Sector2
`
`
`
`
`
`Sector3
`
`
`RRU
`
`
`
`RRU
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`RRU
`
`
`
`RRU
`
`RRU
`
`
`
`RRU
`
`
`
`
`
`BBU2
`BBUI
`<< $—_—_—_————
`
`
`
`
`Fig.7 (d)
`
`SI_Fl
`
` S2_FI
`
`Y ¥
`
`$3 Fl
`
`Y
`
`
`
`
`
`RRU
`
`
`
`RRU}
`
`|RRU
`
`
`
`
`
`
` |
`
`BBU
`
`
`Support3 ~1
`
`Fig.8 (a)
`
`Page 6
`
`CommScope Ex. 1042
`
`

`

`Patent Application Publication Aug. 2, 2007 Sheet 6 of 9
`
`US 2007/0177552 A1
`
`Patent Application Publication Aug. 2,2007 Sheet 6 of 9
`S1 F1
`S2 F1 S3 F1
`
`US 2007/0177552 Al
`
`
`
`Support 3 x)
`Support
`3~]
`Fig.8 (b)
`Fig.8 (b)
`
`SFI
`S1_F2
`
`S2.Fl
`$2.F2
`
`$3_Fl
`§3_F2
`
` Eib capacity
`
`expansioninterface
`Eib capacity
`expansion interface
`
`
`
`
`
`Support 3 X2
`
`Support 3 X2
`Fig.8(c)
`Fig.8(c)
`
`

`

`$3_F2
`
`bus 1/\
`
`BBU4
`
`^cell resource group A
`Nagell resource group-B
`n
`------------
`------------
`d
`Support 3 X2 transmit diversity
`Support 3 X2 transmit diversity
`Fig.8 (d)
`Fig.8 (d)
`
`Patent Application Publication Aug. 2, 2007 Sheet 7 of 9
`
`US 2007/0177552 A1
`
`US 2007/0177552 Al
`
`Patent Application Publication Aug. 2,2007 Sheet 7 of 9
`F1 S2F S3 F1 S3 Fl
`F2 S2. F2 S3 F2 S3 F2
`S2_Fl
`S2.Fl
`S3_Fl
`$3_Fl
`S2.F2
`S$2.F2
`$3_F2
`
`SI_Fi
`SIF2
`
`SFI
`SLF2
`
`s
`
`or'
`
`$3_Fl
`S2_Fl
`SI_Fl
`S3 F1
`S2 FI
`S1 F1
`S3_F2
`S$3_F3
`S2.F2
`SI_F2
`SI_F3.
`S2.F3
`S3 F2 S3 F3
`S1 F2 S1 F3 S2. F2 S2 F3
`Y YW YY YY
`
`
`
`Ei
`ib capacity
`
`/
`{™Pee, >ae fl
`LN aN mos
`{sau +s)
`wateinterface 08\
`expansion interface
`/
`capacity
`Ei t interface
`Eib capacity
`A
`expansion interface
`cell resource group
`a
`eelresource Broun
`:
`cnet
`ee
`sgell resource group A- N. CSOC gyps/
`Support 3 X3
`Y'
`---...---
`s.op
`Support 3 X3
`Fig.8 (e)
`Fig.8 (e)
`
`
`
`
`s
`
`

`

`Patent Application Publication Aug. 2, 2007 Sheet 8 of 9
`
`US 2007/0177552 A1
`
`Patent Application Publication Aug. 2,2007 Sheet 8 of 9
`
`US 2007/0177552 Al
`
`8 TH Sh Sh Se SB
`
`cell resource group
`cell resource group A”
`ia
`n
`w
`group
`“\cellresource group
`“cell resource groupAe
`ia
`Meee,
`ace
`Sweeeeeneereceee
`Nae,a
`aneeer
`wo-a-ser
`"ess---sur-
`Support 3 X4 transmit diversity
`Support 3 X4 transmit diversity
`
`Fig.8 (f)
`Fig.8 (f)
`
`CHOSE ER SER Sn Sch
`
`
`
`
`Fig.9
`Fig.9
`
`
`
`

`

`Patent Application Publication Aug. 2, 2007 Sheet 9 of 9
`
`US 2007/0177552 A1
`
`Patent Application Publication Aug. 2,2007 Sheet 9 of 9
`
`RRU
`
`RRU RRU
`
`RRU
`
`N
`
`\
`
`\
`
`A
`MA
`
`US 2007/0177552 Al
`
`BBU1
`
`BBU2
`
`exchange BBcassette
`exchange BB cassette
`
`Ea
`
`Eia
`
`BBU 3
`
`Eia
`
`Ea
`
`BBU4
`
`BBU 3
`
`BBU4
`
`Fig.11
`Fig.11
`
`
`
`

`

`US 2007/0177552 A1
`
`US 2007/0177552 Al
`
`DISTRIBUTED BASED STATION SYSTEMAND
`METHOD FOR NETWORKING THEREOF AND
`BASE BAND UNIT
`DISTRIBUTED BASED STATION SYSTEM AND
`METHOD FOR NETWORKING THEREOF AND
`FIELD OF THE TECHNOLOGY
`BASE BAND UNIT
`0001. The present invention relates to the base station
`FIELD OF THE TECHNOLOGY
`technology, and more specifically to a distributed base
`station system and a method for networking thereof and base
`[0001] The present invention relates to the base station
`band units forming the distributed base station.
`technology, and more specifically to a distributed base
`station system and a method for networking thereof and base
`band units forming the distributed base station.
`BACKGROUND OF THE INVENTION
`
`BACKGROUNDOF TILE INVENTION
`0002. In mobile communication systems, base stations
`are important components used for connecting User termi
`[0002]
`In mobile communication systems, base stations
`nals to Base Station Controllers (BSC), receiving and trans
`are important components used for connecting User termi-
`mitting radio signals between the User terminals and the
`nals to Base Station Controllers (BSC), receiving and trans-
`BSCs, thereby conducting User terminals to access wireless
`mitting radio signals between the User terminals and the
`networks and simultaneously accomplishing information
`BSCs, thereby conducting User terminals to access wireless
`intercommunications between User terminals and the BSCs.
`networks and simultaneously accomplishing information
`intercommunications between User terminals and the BSCs.
`As shown in FIG. 1, a base station includes:
`As shown in FIG. 1, a base station includes:
`0003) a Base Station &BSC interface unit, also called
`transmission unit, used for accomplishing interface func
`[0003]
`a Base Station &BSC interface unit, also called
`transmission unit, used for accomplishing interface func-
`tions between the base station and the BSC; a Main Pro
`tions between the base station and the BSC; a Main Pro-
`cessing & Timing unit, on the one hand, for controlling the
`cessing & Timing unit, on the one hand, for controlling the
`base station and exchanging cell and traffic data among the
`base station and exchanging cell and traffic data among the
`units in the base station, on the other hand, for providing
`units in the base station, on the other hand, for providing
`clock signals for other units in the base station; an uplink/
`clock signals for other units in the base station; an uplink/
`downlink base band signal processing unit, used for pro
`downlink base band signal processing unit, used for pro-
`cessing symbol-level and chip-level digital signals in physi
`cessing symbol-level and chip-level digital signals in physi-
`cal layer and communicating digital base band signals with
`cal layer and communicating digital base band signals with
`an Intermediate Frequency (IF) signal processing unit; the IF
`an Intermediate Frequency (IF) signal processing unit; the IF
`signal processing unit, used for converting digital base band
`signal processing unit, used for converting digital base band
`signals to IF signals or converting IF signals to digital base
`signals to IF signals or converting IF signals to digital base
`band signals; a power amplifier unit and a duplexer, used for
`band signals; a power amplifier unit and a duplexer, used for
`amplifying the IF signals from the IF signal processing unit
`amplifying the IF signals from the IF signal processing unit
`or an antenna.
`Or an antenna.
`[0004]
`In the base station, the Base Station &BSC inter-
`0004. In the base station, the Base Station &BSC inter
`face unit,
`the Main Processing & Timing unit, and the
`face unit, the Main Processing & Timing unit, and the
`uplink/downlink base band signal processing unit compose
`uplink/downlink base band signal processing unit compose
`a base band part. while the IF signal processing unit, the
`a base band part, while the IF signal processing unit, the
`power amplifier unit and the duplexer compose a Radio
`power amplifier unit and the duplexer compose a Radio
`Frequency (RF) part which accomplishes conversion
`Frequency (RF) part which accomplishes conversion
`between digital base band signals and IF signals, and trans-
`mils the processed RF signals. The components in FIG. 1 are
`between digital base band signals and IF signals, and trans
`all placed in one cabinet to form a complete Base Station.
`mits the processed RF signals. The components in FIG. 1 are
`all placed in one cabinet to form a complete Base Station.
`[0005]
`In traditional base station systems, macro base
`stations and mini base stations are generally used. A macro
`0005. In traditional base station systems, macro base
`base slalion generally has large capacily so as to support the
`stations and mini base stations are generally used. A macro
`configuration of as manyas 3 or 6 sectors, and includes an
`base station generally has large capacity So as to Support the
`indoor type and an outdoor type; while a mini base station
`configuration of as many as 3 or 6 sectors, and includes an
`usually has small capacity so as to only support the con-
`indoor type and an outdoor type; while a mini base station
`figuration of 1
`to 3 sectors. The Mini base station is
`usually has small capacity So as to only Support the con
`generally required to have support capability of outdoor
`application, and acts as a strong complement for the macro
`figuration of 1 to 3 sectors. The Mini base station is
`base station networking.
`generally required to have Support capability of outdoor
`application, and acts as a strong complement for the macro
`[0006] The macro basestation supports large capacity, and
`base station networking.
`all
`its single boards and modules are all placed in one
`cabinet, and thus the macro basestation has a large size and
`0006 The macro base station supports large capacity, and
`a heavy weight, therefore,
`it needs a special installation
`roomor an outdoorinstallation base. While the mini base
`all its single boards and modules are all placed in one
`cabinet, and thus the macro base station has a large size and
`stalion supports small capacity, the size thereof is compara-
`a heavy weight, therefore, it needs a special installation
`tively small and it supports pole installation or wall instal-
`room or an outdoor installation base. While the mini base
`station Supports Small capacity, the size thereof is compara
`tively small and it supports pole installation or wall instal
`
`Aug. 2, 2007
`
`Aug. 2, 2007
`
`lation, so that the installation is easy and does not need
`special installation space or floorage. The construction of the
`macro base station and the mini base station generally used
`lation, so that the installation is casy and does not need
`are introduced hereinafter respectively:
`special installation space or floorage. The construction of the
`0007 (1) In the macro base station, the transmission unit,
`macro base station and the mini base station generally used
`the Main Processing & Timing unit and the uplink/downlink
`are introduced hereinafter respectively:
`base band signal processing unit forming the base band part
`[0007]
`(1) Inthe macro basestation, the transmission unit,
`are respectively placed on different functional single boards,
`the Main Processing & Timing unit and the uplink/downlink
`which are connected with one another by a backboard.
`base bandsignal processing unit forming the base band part
`Different single boards or modules may be added according
`are respectively placed ondifferent functional single boards,
`to different capacity expansion requirements; the duplexer,
`which are connected with one another by a backboard.
`the power amplifier unit, the IF signal processing unit that
`Different single boards or modules may be added according
`to different capacity expansion requirements; the duplexer,
`form the RF part are also placed on different functional
`the power amplifier unit, the IF signal processing unit that
`single boards, which are connected with each other by a
`form the RF part are also placed on different functional
`backboard or external wirings. All the above units are
`single boards, which are connected with each other by a
`configured in one indoor or outdoor cabinet. An outdoor
`backboard or external wirings. All
`the above units are
`cabinet additionally includes Such functional units as tem
`configured in one indoor or outdoor cabinet. An outdoor
`perature control equipment, power Supply, environment
`cabinet additionally includes such functional units as tem-
`monitoring equipment and transmission equipment. With all
`perature control equipment, power supply, environment
`the components in large sizes, the cabinet is very large and
`monitoring equipment and transmission equipment. Withall
`heavy, resulting in high cost of transportation and installa
`the components in large sizes, the cabinet is very large and
`tion and a hard installation site selection, thereby, the
`heavy, resulting in high cost of transportation and installa-
`
`tion and a hard installation site selection,
`thereby,
`the
`network construction speed is badly affected. This kind of
`
`network construction speed is badly affected. This kind of
`structure takes up a large space and leads to a high power
`structure takes up a large space and Icads to a high power
`consumption and cost. When backup is required, it needs to
`consumption and cost. When backup is required, it needs to
`add some single boards or modules to achieve backup,
`add some single boards or modules
`to achieve backup,
`thereby resulting in high backup cost and complicating
`thereby resulting im high backup cost
`and complicating
`backup action.
`backup action.
`0008 (2) In the mini base station, all the units in FIG. 1
`[0008]
`(2) In the mini basestation, all
`the units in FIG. 1
`are placed in a compact structural member module, thereby
`are placed in a compact structural member module, thereby
`a mini base station having a small size and an easy instal
`a mini base station having a small size and an easy instal-
`lation. A mini base station generally supports configuration
`lation. A mini base station generally supports configuration
`of 1-3 sectors.
`In the situation that one single cabinet
`of 1-3 sectors. In the situation that one single cabinet
`supports one sector, a plurality of mini base stations are
`Supports one sector, a plurality of mini base stations are
`necessary for networking when more sectors should be
`necessary for networking when more sectors should be
`supported or large capacity configuration is needed, thereby
`Supported or large capacity configuration is needed, thereby
`complicating networking and management of the system.
`complicating networking and management of the system.
`[0009] The mini base station has the shortcomings of
`0009. The mini base station has the shortcomings of
`small capacity, inconvenient capacity expansion and inflex-
`Small capacity, inconvenient capacity expansion and inflex
`ible networking, although the mini base station has such
`ible networking, although the mini base station has such
`advantages as small size and easyinstallation. A plurality of
`cabinets of mini base stations should be combined when
`advantages as Small size and easy installation. A plurality of
`capacity expansion is required, and this is not in favor of
`cabinets of mini base stations should be combined when
`wiring, protection and backup. Therefore, mini base stations
`capacity expansion is required, and this is not in favor of
`are not fit for the expected applications of large capacity,
`wiring, protection and backup. Therefore, mini base stations
`furthermore, are not in favor of expanding capacity of the
`are not fit for the expected applications of large capacity,
`base band part or the RF part respectively due to the base
`furthermore, are not in favor of expanding capacity of the
`band part and the RF part adopting integration design.
`base band part or the RF part respectively due to the base
`band part and the RF part adopting integration design.
`SUMMARY
`
`
`
`[0010] Adistributed base station system has advantages of
`SUMMARY
`reducing space occupancy, deducing opcrational cost and
`0010) A distributed base station system has advantages of
`improving operational reliability of base station system
`according to the embodiments of the invention.
`reducing space occupancy, deducing operational cost and
`improving operational reliability of base station system
`[0011] A distributed base station system includes:
`according to the embodiments of the invention.
`[0012]
`a base band unit (BBU), which includes a Main
`0011. A distributed base station system includes:
`Processing & Timing unit, a base band signal processing
`unit, a transmission unit, and an interface unit for providing
`0012 a base band unit (BBU), which includes a Main
`an interface for intercommunicating data with an external
`Processing & Timing unit, a base band signal processing
`unil, inlercommunicating digital base band signals with the
`unit, a transmission unit, and an interface unit for providing
`base band signal processing unit, and intercommunicating
`an interface for intercommunicating data with an external
`unit, intercommunicating digital base band signals with the
`base band signal processing unit, and intercommunicating
`
`

`

`US 2007/0177552 A1
`
`US 2007/0177552 Al
`
`master control information with the Main Processing &
`Timing unit; wherein the interface unit includes one or a
`plurality of primary base band Radio Frequency (RF) inter
`master control
`information with the Main Processing &
`face(s); and the interface unit being integrated with the Main
`Timing unit; wherein the interface unit includes one or a
`Processing & Timing unit, the base band signal processing
`plurality of primary base band Radio Frequency (RF) inter-
`unit and the transmission unit; and
`face(s); and the interface unit being integrated with the Main
`0013 a Radio Frequency unit (RFU) which includes a
`Processing & Timing unit, the base band signal processing
`unit and the transmission unit; and
`secondary base band RF interface thereon;
`[0013]
`a Radio Frequency unit (RFU) which includes a
`0014 wherein the primary base band RF interface of the
`secondary base band RF interface thereon;
`BBU is connected with the secondary base band RF inter
`face of the RFU, and the BBU transmits uplink/downlink
`[0014] wherein the primary base band RFinterface ofthe
`BBU is connected with the secondary base band RF inter-
`base band data and master controller state information with
`face of the RFU, and the BBU transmits uplink/downlink
`the RFU via the primary base band RF interface and the
`base band data and master controller state information with
`secondary base band RF interface.
`the RFU via the primary base band RF interface and the
`0015 Preferably, the primary base band RF interface and
`secondary base band RFinterface.
`the secondary base band RF interface both are high speed
`[0015] Preferably, the primary base band RF interface and
`digital interfaces.
`the secondary base band RF interface both are high speed
`digital interfaces.
`0016 Preferably, the base station system includes a plu
`rality of BBUs, and the BBUs are interconnected with each
`[0016] Preferably, the base station system includes a plu-
`other via wire cables or optical fibers; the interface unit of
`rality of BBUs, and the BBUs are interconnected with each
`each BBU includes one or a plurality of primary capacity
`other via wire cables or optical fibers; the interface unit of
`expansion interface(s) for transmitting synchronous clock
`each BBU includes one or a plurality of primary capacity
`expansion interface(s) for transmitting synchronous clock
`signals, base band information, transmission information
`signals, base band information,
`transmission information
`and the master control information among BBUS, to achieve
`and the master control information among BBUs, to achieve
`interconnection and data sharing among BBUs.
`interconnection and data sharing among BBUs.
`0017 Preferably, the primary capacity expansion inter
`[0017] Preferably, the primary capacity expansion intcr-
`face includes a primary capacity expansion interface that
`face includes a primary capacity expansion interface that
`provides an active/standby Switchover control signal. The
`provides an active/standby switchover control signal. The
`interface unit further includes an identification interface for
`interface unit further includes an identification interface for
`marking the type of the base station and the position of the
`marking the type of the base station and the position of the
`BBU.Theinterface unit mayfurther includes a Dry Contact
`BBU. The interface unit may further includes a Dry Contact
`input interface for expanding the input Dry Contact func-
`input interface for expanding the input Dry Contact func
`tions of the base station. The BBUs include a master BBU
`tions of the base station. The BBUs include a master BBU
`that works in an active state.he BBUs mayalso include a
`that works in an active state. The BBUs may also include a
`standby BBU that works in a standby state. The RFU may
`standby BBU that works in a standby state. The RFU may
`be connected with any one ofthe plurality of BBUs.
`be connected with any one of the plurality of BBUs.
`[0018] Preferably, the BBUs include a slave BBU that
`works in a slave state.
`0018 Preferably, the BBUs include a slave BBU that
`works in a slave state.
`[0019] Preferably, the system further includes an exchange
`0.019
`Preferably, the system further includes an exchange
`BBcassette witha plurality of secondary capacity expansion
`interfaces, and each BBU is connected with one of the
`BB cassette with a plurality of secondary capacity expansion
`secondary capacity expansion interfaces on the exchange
`interfaces, and each BBU is connected with one of the
`BBcassette via the respective primary capacity expansion
`secondary capacity expansion interfaces on the exchange
`interface of the BBU.
`BB cassette via the respective primary capacity expansion
`interface of the BBU.
`[0020] Preferably, the RFU is a radio remote unit (RRU).
`0020 Preferably, the RFU is a radio remote unit (RRU).
`[0021] Preferably, the RRU and the BBU are connected
`with each other via transmission mediums.
`0021 Preferably, the RRU and the BBU are connected
`[0022] Preferably, the RFU is a near-end RFU.
`with each other via transmission mediums.
`[0023] Preferably, the BBU is placed in a spare space of a
`0022 Preferably, the RFU is a near-end RFU.
`standard cabinet with a height higher than or equal to 1 U.
`0023 Preferably, the BBU is placed in a spare space of a
`[0024] A method for networking a distributed base station
`standard cabinet with a height higher than or equal to 1 U.
`system includes:
`0024. A method for networking a distributed base station
`[0025]
`separating the base station system into a BBUand
`system includes:
`an RFU in dispersed arrangement, wherein the BBU
`includes an integration of a base bandsignal processing unit,
`0.025
`separating the base station system into a BBU and
`a transmission unil, a Main Processing & Timing unit and a
`an RFU in dispersed arrangement, wherein the BBU
`interface unit;
`the interface unit of the BBU includes a
`includes an integration of a base band signal processing unit,
`a transmission unit, a Main Processing & Timing unit and a
`interface unit; the interface unit of the BBU includes a
`
`Aug. 2, 2007
`
`Aug. 2, 2007
`primary base band RF interface, and the RFU includes at
`least one secondary base band RF interface; and
`0026 connecting the BBU and the RFU through the
`primary base band RF interface, and the RFU includes at
`primary base band RF interface of the BBU and the sec
`least one secondary base band RF interface; and
`ondary base band RF interface of the RFU.
`[0026]
`connecting the BBU and the RFU through the
`0027 Preferably, the base station system includes a plu
`primary base band RF interface of the BBU andthe sec-
`ondary base band RI’ interface of the RFU.
`rality of BBUs, and the interface unit of each BBU includes
`a primary capacity expansion interface, and then, the method
`[0027]
`Preferably, the base station system includes a plu-
`further includes: setting an operation state of the BBU; and
`rality of BBUs, and the interface unit of each BBU includes
`connecting the BBUs with each other via the primary
`a primary capacily expansion interface, and then, the method
`capacity expansion interface on the interface unit thereof.
`further includes: setting an operation state of the BBU; and
`connecting the BBUs with each other via the primary
`0028 Preferably, the base station system includes a plu
`capacity expansion interface on the interface unit thereof.
`rality of RFUs, each RFU includes a plurality of base band
`[0028]
`Preferably, the base station system includes a plu-
`RF interfaces; and then the method further includes: con
`rality of RFUs, each RFU includesa pluralily of base band
`necting a plurality of RFUs with each other via their
`RFinterfaces; and then the method further includes: con-
`respective secondary base band RF interfaces.
`necting a plurality of RFUs with each other via their
`respective secondary base band RFinterfaces.
`0029 Preferably, the base station system includes two
`BBUs and the step of setting the operation state of the BBU
`[0029]
`Preferably, the base station system includes two
`includes: setting one of the BBUs as a master BBU that
`BBUsandthe step of setting the operation state of the BBU
`works in an active state while setting the other BBU as a
`includes: setting one of the BBUs as a master BBU that
`standby BBU that works in a standby state; and the step of
`works in an active state while setting the other BBU as a
`standby BBUthat works in a standby state; and the step of
`connecting the BBUS to each other via the primary capacity
`connecting the BBUsto each other via the primary capacity
`expansion interface includes: connecting the master BBU to
`expansioninterface includes: connecting, the master BBU to
`the standby BBU via the primary capacity expansion inter
`the standby BBUvia the primary capacity expansion inter-
`face that provides an active/standby switchover control
`face that provides an active/standby switchover control
`signal.
`signal.
`0030 Preferably, the step of setting the operation state of
`[0030]
`Preferably, the step ofsetting the operationstate of
`BBUs includes: setting any one of the plurality of BBUs as
`BBUsincludes: setting any one ofthe plurality of BBUs as
`a master BBU that works in the active state, and setting the
`a master BBU that worksinthe active state, and setting the
`others as slave BBUs that work in slave states; and the step
`others as slave BBUs that work in slave states; and the step
`of connecting the BBUs to each other via the primary
`of connecting the BBUs to each other via the primary
`capacity expansion interface includes: connecting the master
`capacity expansion interface includes: connecting the master
`BBUand slave BBUs via one or a plurality of primary
`BBU and slave BBUs via one or a plurality of primary
`capacity expansion interface(s) providing no active/standby
`capacity expansion interface(s) providing no active/standby
`switchover control signal.
`Switchover control signal.
`[0031]
`Preferably, the step of setting the operation state of
`0031
`Preferably, the step of setting the operation state of
`the BBU includes: setting any one ofthe plurality of BBUs
`the BBU includes: setting any one of the plurality of BBUs
`as a master BBU that worksin anactive state, and setting the
`as a master BBU that works in an active state, and setting the
`others as slave BBUs that work in slave states; and the step
`others as slave BBUs that work in slave states; and the step
`of connecting BBUs with each other via the capacity expan-
`of connecting BBUs with each other via the capacity expan
`sion interfaces includes: connecting the master BBU with
`the slave BBUsvia one or a plurality of primary capacity
`sion interfaces includes: connecting the master BBU with
`expansion interface(s) providing the active/standby switcho-
`the slave BBUs via one or a plurality of primary capacity
`ver control signal; and the Main Processing & Timing unit
`expansion interface(s) providing the active/standby Switcho
`of the master BBU shielding the active/standby switchover
`ver control signal; and the Main Processing & Timing unit
`control signal.
`of the master BBU shielding the active/standby switchover
`control signal.
`[0032]
`Preferably, the step of connecting BBUs with each
`other via the capacity expansion interfaces includes: con-
`0032) Preferably, the step of connecting BBUs with each
`necting the master BBU witheachof the slave BBUsvia one
`other via the capacity expansion interfaces includes: con
`or a plurality of primary capacity expansion interface(s)
`necting the master BBU with each of the slave BBUs via one
`providing active/standby switchover control signals; and the
`Main Processing & Timing unit ofthe master BBU