CN101141778A - Method and system for implementing subarea overlapping using mirror-image radio frequency unit - Google Patents
Method and system for implementing subarea overlapping using mirror-image radio frequency unit Download PDFInfo
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- CN101141778A CN101141778A CNA2007101546925A CN200710154692A CN101141778A CN 101141778 A CN101141778 A CN 101141778A CN A2007101546925 A CNA2007101546925 A CN A2007101546925A CN 200710154692 A CN200710154692 A CN 200710154692A CN 101141778 A CN101141778 A CN 101141778A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/28—Cell structures using beam steering
Abstract
The invention discloses a method and a system which can realize zoning coverage through mirror image RRU. The system comprises a plurality of cascaded RRUs and BBUs connected onto the RRUs, and the cascaded RRU comprises a main RRU and a mirror image RRU. In the cascaded RRUs, each RRU transforms analog signal received by at least an antenna from the corresponding covering region into digital signal, therein, the mirror image RRU overlaps the digital signal transmitted from the RRU of the previous cascade and the digital signal gathered in the locality and transfers to the next cascade, the transfer is performed stage by stage until one mirror image RRU transfers the overlapped digital signal into the signal channel of the BBU to perform the baseband processing. The adoption of the invention maintains the coverage radius of each RRU, the coverage capacity in the cell can be expanded under the unlimited capacity, and simultaneously the demand to the BBU processing capacity is reduced.
Description
Technical field
The present invention relates in the mobile communication system based on the subregion soverlay technique of Base Band Unit (BBU) and radio frequency unit (RRU) structure, relate in particular to a kind of mirror image RRU that utilizes and realize the method and system that subregion covers.
Background technology
The subregion of wireless communication system covers a basic demand that provides continuous service.And because the radio signal propagation feature of overlay area, and the power amplifier of wireless system is limited, multichannel technology becomes the important means that solves the subregion covering.
The patent No. that proposes on December 20th, 2000 is that the name of WO/2001/047148 is called in " Cellular Telecommunications Network with an OMNI Directional TransmitterType and a Sectored Receiver Type " international patent application (OTSR), disclose omnidirectional and sent the method that sectorization receives, to increase the overlay area of uplink downlink, when sending, the OTSR system can realize that to several directional antennas omnidirectional sends by the descending power mean allocation that power splitter is exported power amplifier.The application number that proposes on January 16th, 2004 is in 200410001028.3 the domestic patent application " a kind of method of effective covering highway ", to disclose the double antenna that utilizes same sector and covered the technology of different directions to promote the covering performance of highway.And in the TD-SCDMA system, a kind of existing technical scheme is that multichannel technology is used in combination with intelligent antenna technology, to increase the overlay area of uplink downlink, as shown in Figure 1, smart antenna is also referred to as array antenna, can carry out wave beam forming to mobile subscriber's signal adaptively, follow the tracks of user's motion; Another kind of prior art is that different antennas is placed on different floors, so that indoor covering to be provided, as shown in Figure 2.
In addition, along with the enhancing of apparatus figure signal handling capacity, concentrated base band signal process becomes possibility, therefore, a Base Band Unit (BBU) can be connected with a plurality of radio frequency units (RRU), to make full use of the disposal ability of BBU.
In the OTSR system, every antenna need be at the corresponding data feedback channel processing unit independently of base band and intermediate-frequency section, and therefore the port number that takies is more; The down direction power-sharing then may cause distorted signals for many antennas, and causes the shortening of antenna coverage distance.In the multi-channel system of routine, every antenna is all corresponding to up-downgoing passage processing unit independently; And if the employing coupler closes the analog signal of many antennas in the passage processing unit of road to, then be unfavorable for the management of many antennas, simultaneously because analog signal may be produced distortion in transmission course, make the signal coverage distance of RRU of up-downgoing phenomenon all can occur shortening, more can't utilize intelligent antenna technology.
As seen, the realization that subregion covers in the wireless communication system faces many-sided challenge.On the one hand, wish that coverage is big as far as possible, on the other hand, wish that under the situation that guarantees the signal normal process taking minimum up-downgoing passage handles resource.If can on the passage disposal ability of system and antenna processing ability, realize balancedly, will play an important role for the application of system and the lifting of performance so.And between Base-Band Processing part and Radio frequency Processing Unit, RF Processing Unit transmission of digital signals, will improve the reliability and the flexibility of signal transmission, and reduce the complexity of construction, all the more so for the wireless communication system that adopts multi-antenna technology.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of mirror-image radio frequency unit that utilizes and realizes the method and system that subregion covers, not only the covering power of Extended Cell but also do not increase demand to the BBU disposal ability.
On the one hand, the present invention proposes a kind of mirror-image radio frequency unit that utilizes and realizes the method that subregion covers.In the radio frequency unit of cascade, the independent signal that at least one antenna is received from the respective coverage areas territory of each radio frequency unit is a digital signal by analog signal conversion, wherein the digital signal that obtains of mirror-image radio frequency unit digital signal that the upper level radio frequency unit is sent and local sampling superposes and transmits to next stage, transmits step by step in the signalling channel that digital signal after a mirror-image radio frequency unit will superpose is sent to Base Band Unit and carries out Base-Band Processing.
In the said method, described Base Band Unit transmits descending digital signal to the radio frequency unit of described cascade, and each radio frequency unit independently is converted to described descending digital signal analog signal and sends to corresponding overlay area.
In the said method, described stack is saturated stack.
In the said method, described digital signal comprises the shunting sign on each signalling channel.
In the said method, the described mirror-image radio frequency unit digital signal that to be digital signal that the upper level radio frequency unit is sent obtain with local sampling is carried out the contraposition stack according to the sign of each signalling channel and is transmitted to next stage.
On the other hand, the present invention proposes a kind of mirror-image radio frequency unit that utilizes and realizes the system that subregion covers.This system comprises the radio frequency unit and the Base Band Unit that is connected on the described cascaded RF unit of a plurality of cascades, and the radio frequency unit of described cascade comprises main radio frequency unit and mirror-image radio frequency unit, wherein:
Described main radio frequency unit and mirror-image radio frequency unit comprise antenna element, are used to receive the signal in the respective coverage areas territory;
Described main radio frequency unit and mirror-image radio frequency unit comprise the upward signal converting unit, and the signal from analog conversion of signals that is used for antenna element is received is a digital signal;
Described mirror-image radio frequency unit comprises digital synthesis unit, is used for digital signal that the upper level radio frequency unit is sent and the digital signal that local sampling obtains and superposes.
In the said system, described main radio frequency unit and mirror-image radio frequency unit also comprise the downstream signal converting unit, are used for the descending digital signal of described Base Band Unit transmission is converted to analog signal.
In the said system, described stack is saturated stack.
In the said system, described antenna element comprises M antenna, and described upward signal converting unit comprises M analog to digital converter, and described digital synthesis unit comprises M adder.
In the said system, described digital synthesis unit is to be used for digital signal that the upper level radio frequency unit is sent and the digital signal that local sampling obtains to carry out the contraposition stack according to the sign of M signalling channel.
Advantage and characteristics that the present invention is main are as follows:
1. kept the covering radius of each RRU, covering power that can Extended Cell under the not limited situation of capacity has reduced the demand to the BBU disposal ability simultaneously, reaches cost-effective purpose.Compare the advantage that the method that adopts the power splitter subregion to cover has the covering radius aspect, the Digital Signal Processing between up direction different RRUs signal has avoided the noise of mixer introducing, the digital data transmission of down direction to avoid the noise and the decay of power splitter introducing simultaneously.
2. mirror image RRU also is applicable to the networking scene that some are special, as be applied to highway/railway covering scene with the call drop that reduce to switch, be applied to indoor covering scene so that support more overlay area etc. with less BBU port number.
3. in the networking in future, mirror image RRU is changed to main RRU, and the signal of RRU is independently handled the purpose that can reach dilatation in BBU.
Description of drawings
Fig. 1 is the schematic diagram of existing smart antenna in road covers;
Fig. 2 is existing indoor covering schematic diagram based on BBU+RRU;
Fig. 3 is that the mirror image RRU that utilizes that the present invention proposes realizes the system construction drawing that subregion covers;
Fig. 4 is the embodiment of the invention 1 described many mirror images RRU schematic diagram;
Fig. 5 is that the embodiment of the invention 2 described mirror image RRU are applied to the schematic diagram that highway covers;
Fig. 6 is that the present invention is the schematic diagram that embodiment 3 described mirror image RRU are applied to indoor covering.
Embodiment
With reference to Fig. 3, the method and system that utilizes mirror image RRU realization subregion to cover that the present invention proposes is described.
In the down link direction, BBU is to the descending digital signal of the RRU of cascade transmission of one line, and each RRU independently obtains and should descending digital signal be converted to analog signal and arrive corresponding overlay area by antenna transmission.At this, main RRU obtains identical downlink data from the BBU transmission the next same signal with mirror image RRU.
At uplink direction, the RRU of each cascade is digital signal with the signal that antenna receives from the respective coverage areas territory by analog signal conversion, the digital signal that the digital signal that upper level RRU is sent and local sampling obtain superposes and transmits to next stage, be transferred to BBU at last and unify to handle, only having on the way at this, line number word signal transmits to BBU.Here, stack can be adopted the mode of saturated stack, judge that promptly upper level RRU transmits digital signal of coming and the digital signal that local sampling obtains and adds up whether surpass max-thresholds afterwards, if surpass then stack result be this max-thresholds, and if do not surpass stack result be digital signal reality with.Because it is be the digital signal stack, so all irrelevant with the RRU number in the bandwidth of up-downlink direction transfer of data.
Go up the situation that adopts a plurality of antennas for each RRU, the every antenna that each RRU connects can be realized the independently calibration of power, and mirror image RRU technology also can be used in combination with traditional multichannel technology, at this moment, each RRU realizes that independently antenna is proofreaied and correct, and is beneficial to the application of smart antenna.Mirror image RRU technology is as follows with scheme after multichannel technology combines:
In the down link direction, BBU will transmit to the RRU of cascade from the descending digital signal of its each signalling channel, and each RRU independently is converted to this descending digital signal analog signal and sends to corresponding overlay area respectively by each antenna corresponding with each signalling channel.At uplink direction, the RRU of each cascade carries out analog-to-digital conversion with the signal that a plurality of antennas receive from the respective coverage areas territory in each signalling channel of correspondence, the digital signal that sends with upper level RRU is carried out the contraposition stack according to the sign of each signalling channel and is transmitted to next stage, and to the last the digital data transmission of a class mirror-image RRU after with the contraposition stack each corresponding signalling channel in the BBU is carried out Base-Band Processing.
In mirror image RRU technology and scheme that multichannel technology combines, digital signal is made up of the shunting sign on each signalling channel, to the processing of each bar shunting sign as to above-mentioned one tunnel Signal Processing, so the digital signal that the local sampling of each RRU obtains is to carry out the contraposition stack at different interchannels with the digital signal that upper level RRU sends, and then can carry out saturated stack on same passage.This contraposition is superimposed with the use that is beneficial to smart antenna, but can introduce certain upstream noise, thereby this can amplify the capacity generation certain negative effect of the thermal noise of RRU overlay area, user place to system, but the interference source of introducing is less relatively, therefore is applicable to not occasions with limited of capacity.
Among the above-mentioned RRU that carries out independent maintenance, the RRU of distal-most end is called as main RRU, and each RRU that is cascaded on the main RRU is mirror image RRU.At up direction, each RRU includes antenna element and upward signal converting unit, and each mirror image RRU includes digital synthesis unit; At down direction, each RRU includes the downstream signal converting unit.Wherein:
Antenna element on each RRU is used to receive the signal in the respective coverage areas territory, is made up of one or more antennas;
Upward signal converting unit on each RRU, the signal from analog conversion of signals that is used for antenna element is received is a digital signal, this upward signal converting unit can be made up of analog to digital converter (A/D converter), and the number of A/D converter equates with the number of signalling channel;
Digital synthesis unit on each mirror image RRU, being used for digital signal that upper level RRU is sent and the digital signal that local sampling obtains superposes, this numeral synthesis unit can be made up of adder or similar device, and the number of adder equates with the number of signalling channel;
Downstream signal converting unit on each RRU is used for the digital signal that the BBU transmission comes is converted to analog signal, and this downstream signal converting unit can be made up of digital to analog converter (D/A converter), and the number of D/A converter equates with the number of signalling channel.
The scheme of utilizing mirror image RRU to realize that subregion covers of the present invention can satisfy the demand of network to sub-district covering and some special screnes.Below, further describe technical characterictic of the present invention and function characteristics by three embodiment.
The baseband digital domain signal that down direction, BBU will need to send is transferred to RRU, and therefore, the signal of N RRU transmission is identical; Up direction, the received signal of RRU independent process antenna, export the baseband digital domain signal, signal and local sampled signal that mirror image RRU comes upper level RRU transmission are carried out the numeral stack according to the sign of signalling channel, by BBU the signal after superposeing are carried out Base-Band Processing at last.
Meanwhile, the independent calibration of power of in the affiliated area of coverage, carrying out of RRU, such sub-district promptly can cover N the different area of coverage, thereby reaches the purpose of wide covering, has also reduced the demand to the BBU disposal ability, has saved the networking cost.If need the network capacity extension, the digital signal of RRU output is independently inputed to separately BBU processing unit, handle respectively, suitably increase the transmission bandwidth between BBU and RRU simultaneously, record N the different areas of coverage that belong to same sub-district like this and can split into N or N following different sub-district, reached the purpose of raising network capacity.Therefore, mirror image RRU technology has good dilatancy.
Identical with existing RRU function is, RRU respectively separately smart antenna is carried out the calibration of power and antenna is proofreaied and correct.Different with existing RRU function is: down direction, and the digital baseband signal of BBU output is transferred to the RRU of cascade simultaneously, and two RRU obtain identical baseband signal, and carry out follow-up downstream signal and handle; Up direction, each RRU carries out independent process to the signal that receives on the M root antenna in M signalling channel of correspondence, and sampling obtains the base band data of M root antenna, digital signal and local sampled signal that mirror image RRU comes upper level RRU transmission are carried out the contraposition stack according to the sign of signalling channel, and pass to next stage RRU, finally carry out the base band signal process of M passage, comprise the processing that smart antenna is relevant by BBU.
As can be seen from Figure 5, the smart antenna array that M root antenna is formed because the data of RRU passage input are identical, makes that two groups of down beam shapings are identical, i.e. the mirror image wave beam forming.When the user passes through the junction of two sectors, the main beam of two groups of wave beams is towards identical position, because two sectors belong to a sub-district together, the sub-district does not take place and switches in the user, thereby the time of having avoided user movement speed to cause too soon being used for switching causes the problem of cutting off rate inadequately.This technical scheme is equally applicable to the covering of high-speed railway.
Down direction, the digital baseband signal of BBU output is transferred to the RRU of all cascades, and each RRU all obtains identical baseband signal, and carries out follow-up downstream signal and handle; Up direction, each RRU is to receiving the signal independent process on the antenna, and sampling obtains the antenna opening base band data, data and the local antenna samples data that a last RRU is sent are carried out saturated stack then, and passing to next RRU, afterbody RRU is sent to BBU with superimposed data and carries out Base-Band Processing.
This shows, adopt mirror image RRU technology, can obtain a plurality of covering subregions of same sub-district, satisfy the demand of network, and reduce needs, reduced the networking cost the baseband processing unit disposal ability to covering in a plurality of uncorrelated zones.In addition, mirror image RRU also is applicable to the networking scene that some are special, as be applied to highway/railway covering scene with the call drop that reduce to switch, be applied to indoor covering scene so that support more overlay area etc. with less BBU port number.
The present invention discloses with aforesaid preferred embodiment, this is not in order to limit the present invention in order to clearly demonstrate technical scheme just, any those skilled in the art, without departing from the spirit and scope of the present invention, the modification of being done all is included in the application's the scope.
Claims (10)
1. one kind is utilized mirror-image radio frequency unit to realize the method that subregion covers, and it is characterized in that:
In the radio frequency unit of cascade, the independent signal that at least one antenna is received from the respective coverage areas territory of each radio frequency unit is a digital signal by analog signal conversion, wherein the digital signal that obtains of mirror-image radio frequency unit digital signal that the upper level radio frequency unit is sent and local sampling superposes and transmits to next stage, transmits step by step in the signalling channel that digital signal after a mirror-image radio frequency unit will superpose is sent to Base Band Unit and carries out Base-Band Processing.
2. the method for claim 1 is characterized in that:
Described Base Band Unit transmits descending digital signal to the radio frequency unit of described cascade, and each radio frequency unit independently is converted to described descending digital signal analog signal and sends to corresponding overlay area.
3. the method for claim 1 is characterized in that described stack is saturated stack.
4. as claim 1,2 or 3 described methods, it is characterized in that described digital signal comprises the shunting sign on each signalling channel.
5. method as claimed in claim 4 is characterized in that:
The described mirror-image radio frequency unit digital signal that to be digital signal that the upper level radio frequency unit is sent obtain with local sampling is carried out the contraposition stack according to the sign of each signalling channel and is transmitted to next stage.
6. one kind is utilized mirror-image radio frequency unit to realize the system that subregion covers, it is characterized in that this system comprises the radio frequency unit and the Base Band Unit that is connected on the described cascaded RF unit of a plurality of cascades, the radio frequency unit of described cascade comprises main radio frequency unit and mirror-image radio frequency unit, wherein:
Described main radio frequency unit and mirror-image radio frequency unit comprise antenna element, are used to receive the signal in the respective coverage areas territory;
Described main radio frequency unit and mirror-image radio frequency unit comprise the upward signal converting unit, and the signal from analog conversion of signals that is used for antenna element is received is a digital signal;
Described mirror-image radio frequency unit comprises digital synthesis unit, is used for digital signal that the upper level radio frequency unit is sent and the digital signal that local sampling obtains and superposes.
7. system as claimed in claim 6 is characterized in that:
Described main radio frequency unit and mirror-image radio frequency unit also comprise the downstream signal converting unit, are used for the descending digital signal of described Base Band Unit transmission is converted to analog signal.
8. system as claimed in claim 6 is characterized in that described stack is saturated stack.
9. system as claimed in claim 6 is characterized in that:
Described antenna element comprises M antenna, and described upward signal converting unit comprises M analog to digital converter, and described digital synthesis unit comprises M adder.
10. system as claimed in claim 9 is characterized in that:
Described digital synthesis unit is to be used for digital signal that the upper level radio frequency unit is sent and the digital signal that local sampling obtains to carry out the contraposition stack according to the sign of M signalling channel.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101546925A CN101141778A (en) | 2007-09-25 | 2007-09-25 | Method and system for implementing subarea overlapping using mirror-image radio frequency unit |
| PCT/CN2008/000194 WO2009039712A1 (en) | 2007-09-25 | 2008-01-28 | Method and system for realizing covering sectors by using enantiomorphous radio units |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007101546925A CN101141778A (en) | 2007-09-25 | 2007-09-25 | Method and system for implementing subarea overlapping using mirror-image radio frequency unit |
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| CN101141778A true CN101141778A (en) | 2008-03-12 |
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| CNA2007101546925A Pending CN101141778A (en) | 2007-09-25 | 2007-09-25 | Method and system for implementing subarea overlapping using mirror-image radio frequency unit |
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| WO (1) | WO2009039712A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009039712A1 (en) * | 2007-09-25 | 2009-04-02 | Zte Corporation | Method and system for realizing covering sectors by using enantiomorphous radio units |
| WO2011110071A1 (en) * | 2010-08-27 | 2011-09-15 | 华为技术有限公司 | Baseband signal transmission method and apparatus |
| CN104660320A (en) * | 2015-02-06 | 2015-05-27 | 大唐移动通信设备有限公司 | Device, system and method for signal transmission |
| CN106131926A (en) * | 2010-06-15 | 2016-11-16 | 瑞典爱立信有限公司 | Cell searching in heterogeneous network and measurement |
| EP2342834A4 (en) * | 2008-10-16 | 2017-08-09 | Elektrobit Wireless Communications Oy | Beam forming method, apparatus and system |
| WO2017215467A1 (en) * | 2016-06-17 | 2017-12-21 | 中兴通讯股份有限公司 | Processing device, bbu, rru, and antenna correction method |
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| US6349200B1 (en) * | 1997-12-24 | 2002-02-19 | Transcept, Inc. | Monitoring and command system for transceivers used to inter-connect wireless telephones to a broadband network |
| US8958789B2 (en) * | 2002-12-03 | 2015-02-17 | Adc Telecommunications, Inc. | Distributed digital antenna system |
| US7171244B2 (en) * | 2002-12-03 | 2007-01-30 | Adc Telecommunications, Inc. | Communication system and method with gain control for signals from distributed antennas |
| CN100578967C (en) * | 2005-04-27 | 2010-01-06 | 华为技术有限公司 | T cell parameter distribution method for increasing synchronous performance of radio access network |
| CN2817224Y (en) * | 2005-07-22 | 2006-09-13 | 京信通信技术(广州)有限公司 | Mobile communication digital optical fiber direct amplifying station for daisy chain transmission structure |
| CN1716825A (en) * | 2005-08-12 | 2006-01-04 | 京信通信技术(广州)有限公司 | Mobile communication digital optical fiber direct distribution station using daisy chain driving structure |
| CN101141778A (en) * | 2007-09-25 | 2008-03-12 | 中兴通讯股份有限公司 | Method and system for implementing subarea overlapping using mirror-image radio frequency unit |
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2007
- 2007-09-25 CN CNA2007101546925A patent/CN101141778A/en active Pending
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2008
- 2008-01-28 WO PCT/CN2008/000194 patent/WO2009039712A1/en active Application Filing
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009039712A1 (en) * | 2007-09-25 | 2009-04-02 | Zte Corporation | Method and system for realizing covering sectors by using enantiomorphous radio units |
| EP2342834A4 (en) * | 2008-10-16 | 2017-08-09 | Elektrobit Wireless Communications Oy | Beam forming method, apparatus and system |
| CN106131926A (en) * | 2010-06-15 | 2016-11-16 | 瑞典爱立信有限公司 | Cell searching in heterogeneous network and measurement |
| WO2011110071A1 (en) * | 2010-08-27 | 2011-09-15 | 华为技术有限公司 | Baseband signal transmission method and apparatus |
| CN102377477A (en) * | 2010-08-27 | 2012-03-14 | 华为技术有限公司 | Baseband signal transmission method and device |
| CN102377477B (en) * | 2010-08-27 | 2015-01-21 | 华为技术有限公司 | Baseband signal transmission method and device |
| US9066252B2 (en) | 2010-08-27 | 2015-06-23 | Huawei Technologies Co., Ltd. | Method and apparatus for transmitting baseband signals |
| CN104660320A (en) * | 2015-02-06 | 2015-05-27 | 大唐移动通信设备有限公司 | Device, system and method for signal transmission |
| CN104660320B (en) * | 2015-02-06 | 2018-05-01 | 大唐移动通信设备有限公司 | A kind of signal transmitting apparatus, system and method |
| WO2017215467A1 (en) * | 2016-06-17 | 2017-12-21 | 中兴通讯股份有限公司 | Processing device, bbu, rru, and antenna correction method |
| CN107517503A (en) * | 2016-06-17 | 2017-12-26 | 中兴通讯股份有限公司 | A kind of processing unit, BBU, RRU and antenna correcting method |
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| Publication number | Publication date |
|---|---|
| WO2009039712A1 (en) | 2009-04-02 |
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