CN101150348A - An outdoor distribution system and its networking method - Google Patents
An outdoor distribution system and its networking method Download PDFInfo
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- CN101150348A CN101150348A CNA2007101677175A CN200710167717A CN101150348A CN 101150348 A CN101150348 A CN 101150348A CN A2007101677175 A CNA2007101677175 A CN A2007101677175A CN 200710167717 A CN200710167717 A CN 200710167717A CN 101150348 A CN101150348 A CN 101150348A
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Abstract
This invention discloses an indoor distribution system and its networking method, in which, the system includes BBU, RHUB providing routes for baseband information and RRU to realize a requirement supporting indoor cover of large volume, which is convenient for expanding volume and reducing operation cost. This invention also provides a networking method.
Description
Technical field
The present invention relates to station technology, refer to a kind of indoor distributed system and the method for carrying out networking especially by this system.
Background technology
Building is more and more higher, more and more, more and more intensive in the modern metropolitan cities, the radio signal of radio communication is stopped betwixt and is decayed, modern architecture is many to be skeleton with armored concrete, add fully closed exterior decoration, seriously shield and the radio signal that decayed, in such building, be difficult to communicate by letter normally.
In addition, at the low layer of high-rise, base station signal usually a little less than, all be the blind area usually as places such as underground parking, market place builet below the ground, subway, tunnels; Center in big and medium-sized cities, usually the base station intensive as average stop spacing less than one kilometer, therefore the signal in the inlet chamber is relatively more mixed and disorderly usually, unstable, particularly some do not have complete closed skyscraper in, high-rise, signal in the inlet chamber comprises the signal of base station nearby of skyscraper, the base station is by direct projection at a distance, refraction, reflection, signal in the mode inlet chambers such as diffraction, the dynamic instability of signal, the adjacent area serious interference, portable terminal uses under such environment, the sub-district gravity treatment is not frequent when conversing, frequently switch in the communication process, cause speech quality poor, the call drop phenomenon is serious; In the marginal zone in city, base station density is little, in the building far away of distance base station, because of construction material to electromagnetic loss, portable terminal also has been subjected to very big influence and restriction in indoor communication.
For solving the indoor covering problem of above radio signal, at present effective method is built indoor distributed system exactly, signal of base station is introduced directly into each indoor zone by wired mode, again by small size antenna at indoor transmitting base station signal, thereby reach coverage hole in the decontamination chamber, suppress to disturb, for indoor mobile communication subscriber provides stable, reliable radio signal, make the user indoor also can the enjoy high quality personal communication service.Usually, indoor distributed system is divided into passive system and active system.
Passive system comprises signal source equipment and passive signal compartment system.Wherein, signal source equipment can be microcellulor, macrocell base stations or indoor repeater; The passive signal compartment system can comprise equipment such as feeder line, trunk amplifier, power splitter, coupler, domestic aerial.The passive system equipment performance is stable, maintenance is simple, and still, signal arrives the intensity difference of each antenna through behind power splitter, coupler and the line hepatitis consumption, causes coverage effect uneven, and specifically, there is following problem in passive system:
Signal distributing system is passive, and shunt loss is big, and for bigger building, the loss between from the load point to the antenna can reach 30～40dB, therefore causes the radiant power of each antennal interface lower, and sensitivity is relatively poor; For Wideband Code Division Multiple Access (WCDMA) (WCDMA) system, the signal that is assigned on each antenna from load point all is identical, therefore whole system belongs to same sub-district on same carrier wave, and can not split into a plurality of sub-districts, and the frequency quantity of each operator of WCDMA system is very limited, consider that there is The pilot pollution problem in skyscraper, high-rise indoor covering also needs to adopt the frequency different with outdoor covering, the passive signal compartment system is subject to available frequency quantity, so its dilatation ability is very limited.
Active system can roughly be divided into the active distributed antenna system in repeater (ADAS) and based on the ADAS of RF remote unit (RRU).
Fig. 1 is the active distributed antenna system networking in a prior art repeater schematic diagram, and repeater ADAS is normally by one or more signal sources such as base station or wireless discharging-directly station, and an active signal distribution system is formed.Wherein, the active signal distribution system generally is made up of near-end unit (Near End Unit), far-end unit (Far End Unit), signal forwarding node (HUB Node), antenna and optical fiber/CAT5/6 cable/radio frequency (RF) cable, coupler, attenuator of connecting each unit etc.Networking mode can be star-like or layering is star-like.As shown in Figure 1, base station or wireless discharging-directly station pass to the near-end unit with radio-frequency carrier signal, in order to ensure near-end unit nonoverload, and the attenuator of between signal source and near-end unit, contacting; The near-end unit is converted to light signal with the radiofrequency signal that receives and sends to the signal forwarding node through optical fiber, perhaps the radiofrequency signal that receives is converted to analog if signal and sends to far-end unit through the CAT5/6 cable; The signal forwarding node can duplicate the signal from the near-end unit, and passes to a plurality of far-end units respectively.
At present, in the active distributed antenna system in repeater, the signal that is assigned to each antennal interface all is identical, when therefore this scheme is applied in the WCDMA system, can not divide a plurality of co-frequency cells on same carrier wave, so the dilatation ability is very limited; In addition, because base station or wireless discharging-directly station output is radio-frequency carrier signal, and the radio-frequency carrier signal of exporting for the base station equipment of outdoor covering Application Design at present all is powerful, therefore the base station as signal source must keep expensive high-power RF module, thereby causes cost waste; On near-end unit and far-end unit, need to adopt comparatively expensive radio frequency/photoconverter, its cost is also than digital light transducer height.
Fig. 2 is the active distributed antenna system networking schematic diagram of prior art based on RRU, as shown in Figure 2, normally is made up of a Base Band Unit (BBU), several RRU and the optical fiber that transmits signal based on the ADAS of RRU.BBU finishes the Base-Band Processing function of base station, and the interface between BBU and the RRU transmits digital baseband signal, and RRU finishes the conversion between digital baseband signal and the radiofrequency signal.
RRU is the outdoor version RF far-end module according to third generation partner program (3GPP) protocol development, belongs to the RF far-end module of dominant base.RRU can be connected with dominant base by optical interface or electrical interface, shares the Base-Band Processing and the master clock resource of dominant base.Wherein, dominant base comprises indoor macro base station, outdoor macro base station, indoor type BBU, outdoor version BBU etc.RRU places near antenna, and down going channel will be converted to radiofrequency signal from the digital baseband signal of dominant base after antenna is launched, and data feedback channel will send to dominant base after will being converted to digital baseband signal from the radiofrequency signal of antenna.
In some large-scale building, employing is done the far-end covering based on general nearly tens small-power RRU of ADAS of RRU, and when each RRU is an individual cell, support that tens RRU need expend more base-band resource, practical application is economical inadequately, the largest cell quantity of supporting on the macro base station is generally 12～24 at present, and the covering scale is also smaller; Interface between BBU and the RRU is special-purpose in addition, and is not open, therefore can't provide multi-operator to share.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of indoor distributed system, can support jumbo indoor covering requirement, is convenient to dilatation, cuts operating costs simultaneously.
Another object of the present invention is to provide the network-building method of indoor distributed system, can easyly realize the multiple networking mode of indoor distributed system by this method neatly.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
A kind of indoor distributed system, this system comprises:
Base Band Unit BBU, this BBU comprises: sending module, receiver module, master control and clock synchronization module;
At least one RF remote unit RRU is used to realize change between digital baseband signal and radiofrequency signal;
This BBU also comprises: the BBU routing module, and the digital baseband signal that is used for descending digital baseband signal is belonged to same RRU group duplicates and is transmitted to the RRU that is connected with self; Report base station controller after upstream digital baseband signal from same RRU group is weighted summation.
This system also comprises between described BBU and RRU:
At least one provides the remote signaling retransmission unit RHUB of route for digital baseband signal, and the digital baseband signal that is used for the descending digital baseband signal from BBU is belonged to same RRU group duplicates and be transmitted to the RRU that is connected with self; Upstream digital baseband signal from same RRU group is weighted summation and sends to the BBU that is connected with self;
Described BBU also comprises the BBU interface module, is used to connect BBU and RHUB.
Described BBU routing module is used for descending digital baseband signal is belonged to same RRU group but the digital baseband signal that do not belong to same RHUB duplicates and be transmitted to the RHUB that is connected with self; After being weighted summation, report base station controller from different RHUB and the upstream digital baseband signal that belongs to same RRU group.
Described RHUB also comprises: the RPS module is used to described RRU that remote power feeding is provided;
Adopt cable transmission between described RHUB and the RRU.
Described RHUB comprises:
The RHUB routing module according to the route configuration information that issues from described BBU master control and clock synchronization module, duplicates the descending digital baseband signal from the different RRUs group of RHUB interface module 1, and is transmitted to RHUB interface module 2; Upstream digital baseband signal from the different RRUs of the same RRU group of RHUB interface module 2 is weighted summation, and the upstream digital baseband signal after will suing for peace is transmitted to RHUB interface module 1;
RHUB control and clock synchronization module are used for finishing the exchange control of the controlled function of signal forwarding and each intermodule signaling of RHUB, business datum, provide clock reference for RHUB simultaneously.
Described RHUB interface module 1 also is used to connect other RHUB, 1 pair of described RHUB interface module non-under self the digital baseband signal of RHUB do not deal with directly forwarding.
Between described BBU and the RHUB, adopt optical fiber or cable to be connected between described RHUB and the RRU.
A kind of network-building method of indoor distributed system is provided with the BBU router that route is provided in Base Band Unit BBU;
This method also comprises: organize RRU by described BBU router converting downlink digital baseband signal, transmit the upstream digital baseband signal to base station controller to each.
Being set to digital baseband signal provides the remote signaling retransmission unit RHUB of route; In described BBU, further be provided for connecting the BBU interface module of BBU and RHUB;
Described BBU connects RRU by RHUB, and by described BBU router and RHUB router transmit digital baseband signal to each organize RRU.
Described RHUB is one or more; Described RRU is one or more.
Described RHUB comprises: RHUB interface module 1, RHUB routing module, RHUB interface module 2;
Described RHUB is a plurality of, and described BBU links to each other with the RHUB interface module 1 of each RHUB respectively by the BBU interface module;
Perhaps described BBU links to each other with the RHUB interface module 1 of one of them RHUB by the BBU interface module, and is continuous step by step by self RHUB interface module 1 between each RHUB;
Perhaps described BBU is by the BBU interface module, link to each other with the RHUB interface module 1 of one of them RHUB, link to each other step by step by self RHUB interface module 1 between each RHUB, described BBU is by the RHUB interface module 1 of BBU interface module and afterbody RHUB, and RHUB links to each other with afterbody.
Described RHUB comprises: RHUB interface module 1, RHUB routing module, RHUB interface module 2; Described RRU comprises the RRU interface module;
Described RRU is a plurality of, and described RHUB links to each other with the RRU interface module of each RRU respectively by RHUB interface module 2;
Perhaps described RHUB links to each other with the RRU interface module of one of them RRU by RHUB interface module 2, and is continuous step by step by self RRU interface module between each RRU;
Perhaps described RHUB is by RHUB interface module 2, link to each other with the RRU interface module of one of them RRU, link to each other step by step by self RRU interface module between each RRU, described RHUB is by the RRU interface module of RHUB interface module 2 and afterbody RRU, and RRU links to each other with afterbody.
Described RRU comprises the RRU interface module;
Described RRU is a plurality of, and described RHUB links to each other with the RRU interface module of each RRU respectively by RHUB interface module 2;
Perhaps described RHUB links to each other with the RRU interface module of one of them RRU by RHUB interface module 2, and is continuous by self RRU interface module between each RRU;
Perhaps described RHUB is by RHUB interface module 2, link to each other with the RRU interface module of one of them RRU, link to each other step by step by self RRU interface module between each RRU, described RHUB is by the RRU interface module of RHUB interface module 2 and afterbody RRU, and RRU links to each other with afterbody.
The method that described BBU router is transmitted digital baseband signal is:
The digital baseband signal that belongs to same RRU group in the descending digital baseband signal is duplicated and is transmitted to the RRU that is connected with self; Report base station controller after upstream digital baseband signal from same RRU group is weighted summation.
The method that described BBU router is transmitted digital baseband signal is:
To belonging to same RRU group in the descending digital baseband signal but the digital baseband signal that does not belong to same RHUB duplicates and be transmitted to the RHUB that is connected with self; After being weighted summation, report base station controller from different RHUB and the upstream digital baseband signal that belongs to same RRU group.
The method that described BBU router is transmitted digital baseband signal also comprises:
The digital baseband signal that belongs to same RRU group in the descending digital baseband signal of transparent transmission and belong to same RHUB is given and this RHUB.
The method that described RHUB transmits digital baseband signal is:
The digital baseband signal that belongs to same RRU group in the descending digital baseband signal from BBU is duplicated and is transmitted to the RRU that is connected with self; Upstream digital baseband signal from same RRU group is weighted summation and sends to the BBU that is connected with self.
When described RHUB was connected with RHUB, the method that described RHUB transmits digital baseband signal also comprises: described RHUB directly transmitted nonself digital baseband signal.
This method also comprises: the weight that sets in advance each branch road; The method of described weighted sum is: the weight according to each branch road that sets in advance is weighted summation.
The size of described weight depends on the signal to noise ratio requirement of corresponding RRU uplink baseband signal, can be issued by operation maintenance center, or generate automatically according to the out-hole run result.
After the described weighted sum, this method also comprises: the power of the digital baseband signal of adjustment process weighted sum is to rated value.
As seen from the above technical solution, indoor distributed system of the present invention mainly comprises BBU, the remote signaling retransmission unit (RHUB) and the RRU of route is provided for base-band information.By the routing module among BBU and the RHUB,, realized the multiple networking mode of indoor distributed system of the present invention flexibly and easily to last/processing such as descending digital baseband signal duplicates, summation; Simultaneously, the present invention program supports jumbo indoor covering requirement, is convenient to dilatation, has reduced operation cost.
Compare with existing indoor distributed system, the RRU in the indoor distributed system of the present invention is near antenna, and suitable transmission power and receiving sensitivity preferably are provided; The RHUB that increases in the indoor distributed system of the present invention, provide to the multi-path digital baseband signal duplicate selectively, function such as weighted sum, transparent transmission, make the RRU number of single network support increase greatly, thereby supported extensive covering requirement;
By indoor distributed system of the present invention, realized being divided into a plurality of co-frequency cells on the same frequency in consolidated network, support bigger capacity; By adjusting duplicating or summing mode of digital baseband signal at BBU or RHUB, adjusted sub-district division and focus switching etc. easily, be easy to realize network optimization;
In addition, adopt digital data transmission in the indoor distributed system of the present invention, transmission medium adopts optical fiber or CAT5/6 cable, is easy to obtain and construct, and has reduced engineering cost etc.
Description of drawings
Fig. 1 is the active distributed antenna system networking in a prior art repeater schematic diagram;
Fig. 2 is the active distributed antenna system networking schematic diagram of prior art based on RRU;
Fig. 3 is the composition schematic diagram of BBU in the indoor distributed system of the present invention;
Fig. 4 is the composition schematic diagram of RHUB in the indoor distributed system of the present invention;
Fig. 5 is the composition schematic diagram of RRU in the indoor distributed system of the present invention;
Fig. 6 is the networking structure schematic diagram of indoor distributed system networking embodiment one of the present invention;
Fig. 7 is the networking structure schematic diagram of indoor distributed system networking embodiment two of the present invention;
Fig. 8 is the networking structure schematic diagram of indoor distributed system networking embodiment three of the present invention;
Fig. 9 is the networking structure schematic diagram of indoor distributed system networking embodiment four of the present invention;
Figure 10 adopts upward signal processing schematic diagram in the star-like networking between BBU of the present invention and RHUB;
Figure 11 adopts upward signal processing schematic diagram in the chain networking between BBU of the present invention and RHUB;
Figure 12 adopts downstream signal processing schematic diagram in the star-like networking between BBU of the present invention and RHUB;
Figure 13 adopts downstream signal processing schematic diagram in the chain networking between BBU of the present invention and RHUB;
When Figure 14 was the power system capacity increase, the dilatation networking of indoor distributed system dilatation embodiment one of the present invention developed schematic diagram;
When Figure 15 was system's focus variation, the dilatation networking of indoor distributed system dilatation embodiment two of the present invention developed schematic diagram.
Embodiment
Core concept of the present invention is: indoor distributed system of the present invention mainly comprises BBU, the RHUB and the RRU of route is provided for base-band information, wherein, in BBU, be provided with the BBU routing module, be used for to descending digital baseband signal belong to same RRU group but the digital baseband signal that do not belong to same RHUB duplicates forwardings, to from different RHUB and belong to the upstream digital baseband signal that same RRU organizes and be weighted summation; Be provided with the RHUB routing module in RHUB, the digital baseband signal that is used for descending digital baseband signal is belonged to same RRU group duplicates forwardings, the upstream digital baseband signal of organizing from same RRU is weighted summation; In addition, in BBU, RHUB and RRU, be provided with and be used for interconnective interface module.
Indoor distributed system of the present invention can be realized multiple networking mode flexibly and easily, and simultaneously, networking mode of the present invention can be supported jumbo indoor covering requirement, is convenient to dilatation, cuts operating costs.
Indoor distributed system of the present invention and network-building method thereof are applicable in the multiple mobile communication standard, comprise: communication systems such as WCDMA, CDMA2000, TD-SCDMA, GSM, also being applicable to broadband wireless access (BWA) etc., is that example specifies realization of the present invention with the WCDMA system only below.
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing preferred embodiment that develops simultaneously, the present invention is described in more detail.
Indoor distributed system of the present invention mainly comprises BBU, the remote signaling retransmission unit (RHUB) and the RRU of route is provided for digital baseband signal.
Wherein, newly-increased BBU routing module (BBU Router) and BBU interface module (BBU Interface) in BBU, the BBU routing module is used for descending digital baseband signal is duplicated forwarding, or the upstream digital baseband signal is weighted summation; The BBU interface module is used to connect BBU and RHUB, when BBU and RHUB employing Optical Fiber Transmission, the BBU interface module is carried out parallel serial conversion and electric light conversion to descending digital baseband signal, or the upstream digital baseband signal carried out opto-electronic conversion and serial to parallel conversion, when BBU and RHUB employing CAT5/6 cable transmission, the BBU interface module is carried out parallel serial conversion to descending digital baseband signal, or the upstream digital baseband signal is carried out serial to parallel conversion;
RHUB is the newly-increased unit of the present invention, mainly comprises the RHUB interface module 1 (RHUB Interface1), the RHUB interface module 2 (RHUB Interface2) that is used to be connected RHUB and RRU that are used to connect RHUB and BBU, is used to base-band information to provide the RHUB routing module (RHUBRouter) of route, RHUB to control and the clock synchronization module.The detailed introduction of respectively forming module among the RHUB be vide infra to the description of Fig. 4.
The newly-increased RRU interface module (RRUInterface) that is used to connect RRU and RHUB in RRU, when RRU and RHUB employing Optical Fiber Transmission, the RRU interface module is carried out opto-electronic conversion and serial to parallel conversion to descending digital baseband signal, or to the upstream digital baseband signal carry out the conversion of parallel serial conversion and electric light, as RRU during with RHUB employing CAT5/6 cable transmission, the RRU interface module is carried out serial to parallel conversion to descending digital baseband signal, or the upstream digital baseband signal is carried out parallel serial conversion.
Below respectively in conjunction with Fig. 3,4 and 5, the composition of BBU, RHUB and RRU is described in detail.
Fig. 3 is the composition schematic diagram of BBU in the indoor distributed system of the present invention, BBU comprises: sending module, to encode from the downlink data information of base station controller (BSC), processing such as modulation, spread spectrum, and the digital baseband signal after will handling sends to the BBU routing module.Here, if the present invention is applied to other mobile communication system, then sending module is used standard interface reception in the mobile communication system from the downlink data signal of the radio resource controller (RNC) in base station controller in the mobile communication corresponding system such as the WCDMA system by institute; Receiver module carries out processing such as demodulation, decoding to the digital baseband signal from the BBU routing module, and the upstream data information after handling is sent to base station controller; Master control and clock synchronization module are used to finish the exchange control of each intermodule signaling, business datum in the controlled function of base station and the base station, provide clock reference for this BBU simultaneously.
BBU also comprises: the BBU routing module, according to the route configuration information that issues from base station side operation maintenance center, respectively to from the same RRU group of sending module but the descending digital baseband signal of different RHUB duplicates and be transmitted to the BBU interface module; Respectively the upstream digital baseband signal from the different RRUs of the same RRU group of BBU interface module is weighted summation, and the power of the digital baseband signal after the weighted sum is adjusted to rated value, send to receiver module afterwards.Wherein, the size that is used for the weight of weighted sum depends on the signal to noise ratio requirement to corresponding RRU uplink baseband signal, and such as the demanding RRU of signal to noise ratio, the upstream data of this RRU can be provided with big weighted value.The signal to noise ratio of uplink baseband signal can be issued by operation maintenance center, also can obtain by out-hole run.
The BBU interface module is used to connect BBU and RHUB, can adopt optical fiber or CAT5/6 cable transmission digital baseband signal between BBU and the RHUB, but be not limited to above-mentioned transmission medium.When adopting Optical Fiber Transmission, the descending digital baseband signal from the BBU routing module is carried out sending to RHUB after parallel serial conversion, the electric light conversion; To carrying out sending to the BBU routing module behind opto-electronic conversion, the serial to parallel conversion from the upstream digital baseband signal of RHUB; When adopting the CAT5/6 cable transmission, the descending digital baseband signal from the BBU routing module is carried out sending to RHUB behind the parallel serial conversion; To carrying out sending to the BBU routing module behind the serial to parallel conversion from the upstream digital baseband signal of RHUB.
Fig. 4 is the composition schematic diagram of RHUB in the indoor distributed system of the present invention, RHUB is used to the up/descending digital baseband signal that receives to carry out route, comprise RHUB interface module 1, RHUB interface module 2, RHUB routing module, RHUB control and clock synchronization module, can further include remote power feeding module (RPS), each module be described in detail as follows:
The RHUB routing module according to the route configuration information that issues from BBU master control and clock synchronization module, duplicates the descending digital baseband signal from the different RRUs group of RHUB interface module 1, is transmitted to RHUB interface module 2 afterwards; Upstream digital baseband signal from the different RRUs of the same RRU group of RHUB interface module 2 is weighted summation, and the upstream digital baseband signal after will suing for peace is transmitted to RHUB interface module 1;
RHUB control and clock synchronization module are used for finishing the exchange control of the controlled function of signal forwarding and each intermodule signaling of RHUB, business datum, provide clock reference for this RHUB simultaneously.
The RPS module provides remote power feeding for RRU, and the RPS module is an optional module.When selecting the RPS module for use, adopt the CAT5/6 transmission between RHUB and the RRU.
Fig. 5 is the composition schematic diagram of RRU in the indoor distributed system of the present invention, RRU comprises: sending module, digital baseband signal from the RRU interface module is carried out processing such as pulse-shaping, digital to analog conversion, power amplification, the downlink data information after handling is launched by antenna through duplexer (Duplexer); Receiver module, by the upstream data information of duplexer reception from antenna, the upstream data information that receives is carried out forming digital baseband signal after radio frequency amplification, analog-to-digital conversion, the matched filter processing, and the digital baseband signal after will handling sends to the RRU interface module; RRU control and clock synchronization module are used for finishing the exchange control to each intermodule signaling of RRU, business datum, provide clock reference for this RRU simultaneously;
Wherein, the RRU interface module is used to connect RRU and RHUB, can adopt optical fiber or CAT5/6 cable to be connected between RRU and the RHUB.When adopting the Optical Fiber Transmission digital baseband signal, at down direction, the RRU interface module carries out being transmitted to sending module behind opto-electronic conversion, the serial to parallel conversion to the digital baseband signal from RHUB; At up direction, the RRU interface module carries out being transmitted to RHUB after parallel serial conversion, the electric light conversion to the digital baseband signal from receiver module; When adopting CAT5/6 cable transmission digital baseband signal, at down direction, the RRU interface module carries out being transmitted to sending module behind the serial to parallel conversion to the digital baseband signal from RHUB; At up direction, the RRU interface module carries out being transmitted to RHUB behind the parallel serial conversion to the digital baseband signal from receiver module; At this moment, if RHUB has adopted the RPS module, then the RRU interface module is also finished and extract the direct current supply signal from the digital baseband signal that receives.
Each BBU can support a plurality of RHUB and RRU, and RRU can be divided into several RRU groups again, and wherein, a RRU group is supported a sub-district (CELL).Each RRU down direction of same RRU group is launched the signal of same CELL, and up direction receives the signal from same CELL.
Adopt indoor distributed system of the present invention can easyly realize the multiple network-building method of indoor distributed system neatly,, enumerate several networking embodiment below as star-like, chain, ring-like and mixed type etc.
Fig. 6 is the networking structure schematic diagram of indoor distributed system networking embodiment one of the present invention, and as shown in Figure 6, a BBU forms star-like the connection with K RHUB, and a BBU forms star-like the connection by K RHUB with N RRU.In the present embodiment, suppose that whole indoor distributed system needs four CELL according to the network planning, each CELL needs n1, n2, n3, a n4 RRU respectively, and 4 CELL need N RRU, i.e. N=n1+n2+n3+n4 altogether, wherein, n1, n2, n3, n4 and N are positive integer.In order to support N RRU, need K RHUB as intermediate node altogether, form the network that layering is star-like.The digital baseband signal of different RRUs group all has sign separately, and this sign is used for RHUB and the RRU under the reference numbers baseband signal.
For convenience of description, for each RRU provides a numbering, be respectively RRU
1, RRU
2... RRU
N, according to above-mentioned network planning requirement, N RRU is divided into four RRU groups: first group (Group1) comprises RRU1, RRU2......RRU
N1, Group2 comprises RRU
N1+1, RRU
N1+2... RRU
N1+n2, Group3 comprises RRU
N1+n2+1, RRU
N1+n2+2... .RRU
N1+n2+n3, Group4 comprises RRU
N1+n2+n3+1, RRU
N1+n2+n3+2... RRU
N
From Fig. 6 as seen, the RRU of Group1 only links to each other with RHUB1, the RRU of Group2 links to each other with RHUB2 with RHUB1 respectively, RRU and the RHUB2～RHUB of Group3
K-1RRU continuous, Group4 only links to each other with RHUBk, and monopolizes RHUB
kThe digital baseband signal of different RRUs group all has sign separately, and this sign is used for RHUB and the RRU under the reference numbers baseband signal, and the downlink information of each RRU is identical in each RRU group.
At down direction, BBU routing module among the BBU is according to the route configuration information, four groups of digital baseband signals from self sending module are handled, and promptly the digital baseband signal of transparent transmission Group1 is given RHUB1, the digital baseband signal that duplicates Group2 is 2 parts and sends to RHUB1 and RHUB2 respectively, the digital baseband signal that duplicates Group3 is for (k-2) part and sends to RHUB2～RHUB respectively
K-1, transparent transmission Group4 digital baseband signal give RHUB
kHere, transparent transmission is not meant the signal of process is done any processing;
With RHUB1 is example, suppose between BBU and the RHUB, all adopt the Optical Fiber Transmission digital baseband signal between RHUB and the RRU, processing among the RHUB1 comprises: the RHUB1 interface module 1 of RHUB1 is carried out opto-electronic conversion with the digital baseband signal that receives, be transmitted to RHUB 1 routing module behind the serial to parallel conversion, the RHUB1 routing module is according to the route configuration information, the digital baseband signal of the different RRUs group that receives is sent to each RRU corresponding port respectively to get on, the digital baseband signal that promptly duplicates Group1 is n1 part, is transmitted to each RRU among the Group1 respectively, the digital baseband signal of 1 part of Group2 of transparent transmission is to RRU
N1+1
RRU interface module among the RRU carries out the digital baseband signal that receives to be transmitted to sending module behind opto-electronic conversion, the serial to parallel conversion, and the downlink data information that obtains after handling by sending module is launched by antenna through duplexer.
At up direction, after each RRU is converted to digital baseband signal with radiofrequency signal, according to the network connection digital baseband signal is sent to affiliated RHUB, RHUB is weighted summation to the digital baseband signal from the different RRUs of same RRU group that receives respectively, and the digital baseband signal after will suing for peace sends to self affiliated BBU, BBU is weighted summation to the digital baseband signal of the different RRUs of same RRU group in the digital baseband signal from different RHUB that receives respectively, and after the power of the digital baseband signal after will suing for peace adjusts to rated value, the digital baseband signal after handling is carried out Base-Band Processing and sends to base station controller.Here, the size of weight depends on the signal to noise ratio requirement of corresponding RRU uplink baseband signal, can be issued by operation maintenance center, also can generate automatically according to the out-hole run result.
Fig. 7 is the networking structure schematic diagram of indoor distributed system networking embodiment two of the present invention, as shown in Figure 7, a BBU forms chain or ring-like the connection with K RHUB, and a BBU forms star-like the connection by K RHUB with N RRU, among Fig. 7, BBU forms chain by solid line with RHUB and is connected; BBU forms ring-like be connected with dotted line with RHUB by solid line.Compartment system shown in Figure 7 is connected to mix and connects, and is that with the difference of Fig. 6 the method for attachment of BBU and RHUB is different.
Suppose that BBU and K RHUB form chain and be connected, between BBU and the RHUB, between RHUB and the RHUB, all adopt the Optical Fiber Transmission digital baseband signal between RHUB and the RRU, so, at down direction, RHUB directly is given to the RHUB that links to each other with self with the digital baseband signal that does not belong to self after receiving digital baseband signal from BBU by RHUB interface module 1; And to belonging to the digital baseband signal of self, send to corresponding RRU after duplicating etc. in the place according to the description among Fig. 6 to get final product; At up direction, each RHUB receives from the digital baseband signal of the different RRUs of same RRU group and sues for peace, and the power of the digital baseband signal after will suing for peace is adjusted to after the rated value, the digital baseband signal that begins step by step summation to be obtained from afterbody RHUB sends to previous stage RHUB, after suing for peace once more, previous stage RHUB sends, after sending to first order RHUB, by sending to BBU after this first order RHUB summation.
Fig. 8 is the networking structure schematic diagram of indoor distributed system networking embodiment three of the present invention, when the compartment system scale is smaller, can adopt the networking mode of no RHUB, and as shown in Figure 8, a BBU forms chain or ring-like the connection with N RRU.RRU still can be divided into several groups, and the transmission medium between BBU and the RRU can adopt CAT5/6 or optical fiber etc., and BBU can further provide remote power feeding by RPS for RRU.
Fig. 9 is the networking structure schematic diagram of indoor distributed system networking embodiment four of the present invention, and as shown in Figure 9, a BBU is connected with a RHUB, and a BBU forms chain or ring-like the connection by this RHUB with N RRU.Fig. 9 illustrates between RHUB and the RRU also can realize chain or ring-like the connection.
Describe as seen from above embodiment, in various network-building methods, BBU routing module among the BBU and the RHUB routing module among the RHUB duplicate or weighted sum digital baseband signal according to networking mode, make digital baseband signal be able to correct transmission.Introduce the operation principle of BBU routing module and RHUB routing module below in detail.
BBU routing module or RHUB routing module are at up direction, be mainly used in the digital baseband signal from the different RRUs of same RRU group is weighted summation, the BBU routing module also further comprises: the power of adjusting digital baseband signal is to rated value, to satisfy the base band demodulating performance requirement.BBU routing module or RHUB routing module to which RRU signal are sued for peace, and depend on the route configuration information, and the route setting realizes by master control among the BBU and clock synchronization module.The size of weight depends on the signal to noise ratio requirement of corresponding RRU uplink baseband signal, can be issued by operation maintenance center, also can generate automatically according to the out-hole run result.
BBU routing module or RHUB routing module be at down direction, is mainly used in same RRU group but the digital baseband signal of different RHUB duplicates.BBU routing module or RHUB routing module to which RRU signal duplicate, and depend on the routing configuration configuration information, and the route setting is realized by master control among the BBU and clock synchronization module.
Figure 10 adopts upward signal processing schematic diagram in the star-like networking between BBU of the present invention and RHUB, as shown in figure 10, a BBU forms star-like the connection with two RHUB, RHUB1 forms star-like the connection with i RRU, RHUB2 forms star-like the connection with (m-i) individual RRU, supposes that here i the RRU that is connected with RHUB1 is RRU
1～RRU
i, and (m-i) the individual RRU that is connected with RHUB2 is RRU
I+1～RRU
mAll belonging to same RRU group is Groupj, and the upward signal summation method of star-like connection is:
Suppose that the last line output digital baseband signal of RRU1～RRUm is respectively S
1～S
m, S
1～S
mPower generally unequal.
The RHUB routing module of RHUB1 according to the weight of each branch road configuration to from RRU
1～RRU
iUpward signal S
1～S
iBeing weighted summation is Sa=K
1* S
1+ K
2* S
2+ ...+K
i* S
i, obtain Sa; The RHUB routing module of RHUB2 is to from RRU
I+1～RRU
mUpward signal S
I+1～S
mBeing weighted summation is Sb=K
I+1* S
I+1+ K
I+2* S
I+2+ ...+K
m* S
m, obtain Sb; , wherein, K
1～K
mWeights for each branch road.
Then, Sa and Sb are sent to BBU, and the BBU routing module of BBU is according to configure weights, and the upstream digital baseband signal from the same group of RRU of RHUB1 and RHUB2 is carried out the weighted sum second time.Suppose that through the signal after the weighted sum of BBU routing module be S, so,
S=Ka * Sa+Kb * Sb, wherein, Ka and Kb are respectively the weight of two branch roads.
Afterwards signal S is carried out the power adjustment, make that the signal power that enters the BBU receiver module is a rated power,, the signal after the demodulation is sent to base station controller to satisfy the requirement of demodulator.
Above-mentioned concrete weighted sum can realize that specific implementation belongs to those skilled in the art's known technology, repeats no more by logical circuit or high speed processor here.Summation method shown in Figure 10 is suitable equally for the networking mode of plural RHUB, and specific implementation no longer is repeated in this description.
Figure 11 adopts upward signal processing schematic diagram in the chain networking between BBU of the present invention and RHUB, as shown in figure 10, a BBU forms chain with two RHUB and is connected, RHUB1 forms star-like the connection with i RRU, RHUB2 forms star-like the connection with (m-i) individual RRU, supposes that here i the RRU that is connected with RHUB1 is RRU
1～RRU
i, and (m-i) the individual RRU that is connected with RHUB2 is RRU
I+1～RRU
mAll belong to same RRU group and promptly belong to Groupj, the upward signal weighted sum method that chain connects is:
Suppose that the last line output digital baseband signal of RRU1～RRUm is S
1～S
m, RRU
1～RRU
mExisting up automatic gain control function all is provided, makes S
1～S
mPower equate.
The RHUB routing module of RHUB1 is to from RRU
1～RRU
iUpward signal S
1～S
iBeing weighted summation is Sa=K
1* S
1+ K
2* S
2+ ...+K
i* S
i, obtain Sa; The RHUB routing module of RHUB2 is to from RRU
I+1～RRU
mUpward signal S
I+1～S
mBeing weighted summation is Sb=K
I+1* S
I+1+ K
I+2* S
I+2+ ...+K
m* S
m, obtain Sb;
Then, Sb is sent to the RHUB routing module through the RHUB of RHUB1 interface module 1, owing to belong to same group of RRU from the Sb of RHUB2 and the Sa that obtains that self sues for peace, so RHUB1 carries out the weighted sum second time according to configure weights to Sa and Sb.Suppose that through the signal after the summation of RHUB1 routing module be S, so,
S=Ka * Sa+Kb * Sb, wherein, Ka and Kb are respectively the weight of two branch roads.
At last, in BBU, the BBU routing module carries out the power adjustment to signal S, makes that the signal power enter the BBU receiver module is a rated power, satisfying the requirement of demodulator, and the signal after the demodulation is sent to base station controller.
Upward signal summation method shown in Figure 11 is that with the difference of method shown in Figure 10 from the Sb of RHUB2, with the Sa summation, formula still is: S=Ka * Sa+Kb * Sb in the RHUB of RHUB1 routing module.
Figure 12 adopts downstream signal processing schematic diagram in the star-like networking between BBU of the present invention and RHUB, networking and Figure 10 are identical as shown in figure 12, still suppose the RRU that is connected with RHUB1
1～RRU
i, and the RRU that is connected with RHUB2
I+1～RRU
mAll belonging to same RRU group is Groupj, and the upward signal clone method of star-like connection is:
The BBU routing module is organized belonging to same RRU according to self route setting, but does not belong to the descending digital baseband signal of same RHUB, duplicates according to the quantity of RHUB under this RRU group; The RHUB routing module is provided with according to self route, and the quantity of the RRU in each RRU group that connects according to RHUB is duplicated the digital baseband signal from the different RRUs group of RHUB interface module 1 respectively.
As the description to Fig. 6, the digital baseband signal of different RRUs group all has sign separately, and this sign is used for RHUB and the RRU under the reference numbers baseband signal, and the downlink information of each RRU is identical in each RRU group.Among Figure 12, BBU routing module among the BBU at first will be copied into identical two parts from the digital baseband signal that is sent to Groupj of BBU sending module, send to the RHUB interface module 1 of RHUB1 and the RHUB interface module 1 of RHUB2 through the BBU interface module respectively afterwards, pass to the routing module of RHUB1 and RHUB2 afterwards, the quantity of RRU among RHUB1 and the Groupj that RHUB routing module among the RHUB2 is connected according to self respectively, the digital baseband signal of the Groupj that receives is copied into i part and (m-i) part, divides at last to be sent to each RRU.
Figure 13 adopts downstream signal processing schematic diagram in the chain networking between BBU of the present invention and RHUB, networking shown in Figure 13 and Figure 11 are identical, still suppose the RRU that is connected with RHUB1
i～RRU
i, and the RRU that is connected with RHUB2
I+1～RRU
mAll belonging to same RRU group is Groupj, and the upward signal clone method that chain connects is:
Among Figure 13, BBU routing module among the BBU allows from the digital baseband signal transparent transmission that is sent to Groupj of BBU sending module, and pass to the RHUB interface module 1 of RHUB1 through the BBU interface module, this RHUB interface module 1 sends to the RHUB routing module of RHUB1 with the digital baseband signal of the Groupj that receives, and the signal forwarding that this is received is RHUB2 to next stage RHUB simultaneously.The quantity of RRU among RHUB1 and the Groupj that RHUB routing module among the RHUB2 is connected according to self respectively is copied into i part and (m-i) part with the digital baseband signal of delivering to Groupj that receives, and is distributed to each RRU at last.
In addition, if BBU is not directly connected to a plurality of RRU by RHUB, and these RRU exist when adhering to different RRU groups separately, as shown in Figure 8, at this moment, can sue for peace respectively or replication processes to the upstream or downstream digital baseband signal of different RRUs group by the BBU routing module among the BBU.
When power system capacity increased, the invention described above indoor distributed system can be expanded capacity by cell splitting, and need not to realize by increasing carrier wave.When Figure 14 is the power system capacity increase, the dilatation networking of indoor distributed system dilatation embodiment one of the present invention develops schematic diagram, the specific implementation method is: master control among the BBU and clock lock unit basis are from the control information of the actual sets web frame generation of the current RRU of base station controller, all RRU are divided into groups again and generate the route configuration information, master control among the BBU afterwards and clock lock unit are handed down to BBU and RHUB with the route configuration information, and the route that BBU and RHUB then organize according to new RRU is provided with sues for peace respectively or replication processes to the upstream or downstream digital baseband signal of different RRUs group.
As shown in figure 14, at capacity hour, it is among the Group1 that the whole RRU in the whole indoor distributed system are divided into same RRU group, and whole Group1 belongs to same sub-district; Along with capacity increases, it is Group1 and Group2 that indoor distributed system is divided into two RRU groups, and Group1 respectively belongs to two different sub-districts with Group2; When capacity further increased, it was Group1, Group2, Group3, Group4 and Group5 that whole indoor distributed system will extend further to 5 RRU groups, and Group1, Group2, Group3, Group4 and Group5 respectively belong to five different sub-districts.In dilation process shown in Figure 14, indoor distributed system only need reconfigure system and need not to carry out new project installation work.
In addition, when system's focus changed, the invention described above indoor distributed system can be readjusted hotspot location by the distribution of adjusting the RRU group, and need not new engineering operation.Figure 15 is that system's focus is when changing, the dilatation networking of indoor distributed system dilatation embodiment two of the present invention develops schematic diagram, the specific implementation method is: suppose that it is Group1 and Group2 that RRU in the indoor distributed system is divided into two RRU groups, support two different sub-districts respectively, wherein Group2 only comprises a RRU
N1+2, Group1 comprises all remaining RRU, RRU
N1+2The cell capacity at place is very high, is called as focus, therefore, need open up an independent sub-district and support this RRU
N1+2And along with the migration of focus, Hot Spot also should and change along with the focus migration, as shown in figure 15, supposes that focus migrates to RRU
N1+1The sub-district at place, need be set to comprise RRU by Group2 this moment
N1+1And all remaining RRU are set at and get final product among the Group1, the specific implementation control information that to be master control among the BBU and clock lock unit equally generate according to the actual sets web frame from the current RRU of base station controller, all RRU are divided into groups again and generate the route configuration information and need reshuffle the RRU group, master control among the BBU afterwards and clock lock unit are handed down to BBU and RHUB with the route configuration information, and the route that BBU and RHUB then organize according to new RRU is provided with sues for peace respectively or replication processes to the upstream or downstream digital baseband signal of different RRUs group.
In sum, indoor distributed system of the present invention is compared with existing indoor distributed system, and the RRU in the indoor distributed system of the present invention is near antenna, and suitable transmission power and receiving sensitivity preferably can be provided; Increase RHUB in the indoor distributed system of the present invention, provide to the multi-path digital baseband signal selectively duplicate, function such as summation, transparent transmission, make the RRU number of single network support increase greatly, thereby supported extensive covering requirement;
By indoor distributed system of the present invention, realized being divided into a plurality of co-frequency cells on the same frequency in consolidated network, support bigger capacity; By adjusting duplicating or summing mode of digital baseband signal at BBU or RHUB, adjusted sub-district division and focus switching etc. easily, be easy to realize network optimization;
In addition, adopt digital data transmission in the indoor distributed system of the present invention, transmission medium adopts optical fiber or CAT5/6 cable, is easy to obtain and construct, and has reduced engineering cost etc.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (20)
1. indoor distributed system, this system comprises:
Base Band Unit BBU, this BBU comprises: sending module, receiver module, master control and clock synchronization module;
At least one RF remote unit RRU is used to realize change between digital baseband signal and radiofrequency signal;
It is characterized in that this BBU also comprises: the BBU routing module, the digital baseband signal that is used for descending digital baseband signal is belonged to same RRU group duplicates and is transmitted to the RRU that is connected with self; Report base station controller after upstream digital baseband signal from same RRU group is weighted summation.
2. system according to claim 1 is characterized in that, this system also comprises between described BBU and RRU:
At least one provides the remote signaling retransmission unit RHUB of route for digital baseband signal, and the digital baseband signal that is used for the descending digital baseband signal from BBU is belonged to same RRU group duplicates and be transmitted to the RRU that is connected with self; Upstream digital baseband signal from same RRU group is weighted summation and sends to the BBU that is connected with self;
Described BBU also comprises the BBU interface module, is used to connect BBU and RHUB.
Described BBU routing module is used for descending digital baseband signal is belonged to same RRU group but the digital baseband signal that do not belong to same RHUB duplicates and be transmitted to the RHUB that is connected with self; After being weighted summation, report base station controller from different RHUB and the upstream digital baseband signal that belongs to same RRU group.
3. system according to claim 2 is characterized in that, described RHUB also comprises: the RPS module is used to described RRU that remote power feeding is provided;
Adopt cable transmission between described RHUB and the RRU.
4. system according to claim 2 is characterized in that, described RHUB comprises:
RHUB interface module 1 is used to connect described RHUB and BBU;
The RHUB routing module according to the route configuration information that issues from described BBU master control and clock synchronization module, duplicates the descending digital baseband signal from the different RRUs group of RHUB interface module 1, and is transmitted to RHUB interface module 2; Upstream digital baseband signal from the different RRUs of the same RRU group of RHUB interface module 2 is weighted summation, and the upstream digital baseband signal after will suing for peace is transmitted to RHUB interface module 1;
RHUB interface module 2 is used to connect RHUB and RRU;
RHUB control and clock synchronization module are used for finishing the exchange control of the controlled function of signal forwarding and each intermodule signaling of RHUB, business datum, provide clock reference for RHUB simultaneously.
5. system according to claim 4 is characterized in that, described RHUB interface module 1 also is used to connect other RHUB, 1 pair of described RHUB interface module non-under self the digital baseband signal of RHUB do not deal with directly forwarding.
6. system according to claim 2 is characterized in that, between described BBU and the RHUB, adopt optical fiber or cable to be connected between described RHUB and the RRU.
7. the network-building method of an indoor distributed system is characterized in that, the BBU router that route is provided is set in Base Band Unit BBU;
This method also comprises: organize RRU by described BBU router converting downlink digital baseband signal, transmit the upstream digital baseband signal to base station controller to each.
8. method according to claim 7 is characterized in that, is set to the remote signaling retransmission unit RHUB that digital baseband signal provides route; In described BBU, further be provided for connecting the BBU interface module of BBU and RHUB;
Described BBU connects RRU by RHUB, and by described BBU router and RHUB router transmit digital baseband signal to each organize RRU.
9. method according to claim 8 is characterized in that, described RHUB is one or more; Described RRU is one or more.
10. method according to claim 8 is characterized in that, described RHUB comprises: RHUB interface module 1, RHUB routing module, RHUB interface module 2;
Described RHUB is a plurality of, and described BBU links to each other with the RHUB interface module 1 of each RHUB respectively by the BBU interface module;
Perhaps described BBU links to each other with the RHUB interface module 1 of one of them RHUB by the BBU interface module, and is continuous step by step by self RHUB interface module 1 between each RHUB;
Perhaps described BBU is by the BBU interface module, link to each other with the RHUB interface module 1 of one of them RHUB, link to each other step by step by self RHUB interface module 1 between each RHUB, described BBU is by the RHUB interface module 1 of BBU interface module and afterbody RHUB, and RHUB links to each other with afterbody.
11. method according to claim 8 is characterized in that, described RHUB comprises: RHUB interface module 1, RHUB routing module, RHUB interface module 2; Described RRU comprises the RRU interface module;
Described RRU is a plurality of, and described RHUB links to each other with the RRU interface module of each RRU respectively by RHUB interface module 2;
Perhaps described RHUB links to each other with the RRU interface module of one of them RRU by RHUB interface module 2, and is continuous step by step by self RRU interface module between each RRU;
Perhaps described RHUB is by RHUB interface module 2, link to each other with the RRU interface module of one of them RRU, link to each other step by step by self RRU interface module between each RRU, described RHUB is by the RRU interface module of RHUB interface module 2 and afterbody RRU, and RRU links to each other with afterbody.
12. method according to claim 10 is characterized in that, described RRU comprises the RRU interface module;
Described RRU is a plurality of, and described RHUB links to each other with the RRU interface module of each RRU respectively by RHUB interface module 2;
Perhaps described RHUB links to each other with the RRU interface module of one of them RRU by RHUB interface module 2, and is continuous by self RRU interface module between each RRU;
Perhaps described RHUB is by RHUB interface module 2, link to each other with the RRU interface module of one of them RRU, link to each other step by step by self RRU interface module between each RRU, described RHUB is by the RRU interface module of RHUB interface module 2 and afterbody RRU, and RRU links to each other with afterbody.
13. method according to claim 7 is characterized in that, the method that described BBU router is transmitted digital baseband signal is:
The digital baseband signal that belongs to same RRU group in the descending digital baseband signal is duplicated and is transmitted to the RRU that is connected with self; Report base station controller after upstream digital baseband signal from same RRU group is weighted summation.
14. method according to claim 8 is characterized in that, the method that described BBU router is transmitted digital baseband signal is:
To belonging to same RRU group in the descending digital baseband signal but the digital baseband signal that does not belong to same RHUB duplicates and be transmitted to the RHUB that is connected with self; After being weighted summation, report base station controller from different RHUB and the upstream digital baseband signal that belongs to same RRU group.
15. method according to claim 14 is characterized in that, the method that described BBU router is transmitted digital baseband signal also comprises:
The digital baseband signal that belongs to same RRU group in the descending digital baseband signal of transparent transmission and belong to same RHUB is given and this RHUB.
16. method according to claim 8 is characterized in that, the method that described RHUB transmits digital baseband signal is:
The digital baseband signal that belongs to same RRU group in the descending digital baseband signal from BBU is duplicated and is transmitted to the RRU that is connected with self; Upstream digital baseband signal from same RRU group is weighted summation and sends to the BBU that is connected with self.
17. method according to claim 16 is characterized in that, when described RHUB was connected with RHUB, the method that described RHUB transmits digital baseband signal also comprises: described RHUB directly transmitted nonself digital baseband signal.
18., it is characterized in that this method also comprises: the weight that sets in advance each branch road according to claim 14 or 16 described methods; The method of described weighted sum is: the weight according to each branch road that sets in advance is weighted summation.
19. method according to claim 18 is characterized in that, the size of described weight depends on the signal to noise ratio requirement of corresponding RRU uplink baseband signal, can be issued by operation maintenance center, or generate automatically according to the out-hole run result.
20., it is characterized in that after the described weighted sum, this method also comprises according to claim 14 or 16 described methods: the power of the digital baseband signal of adjustment process weighted sum is to rated value.
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