CN104168071B - The method and system of reciprocity calibration between a kind of RRU - Google Patents
The method and system of reciprocity calibration between a kind of RRU Download PDFInfo
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- CN104168071B CN104168071B CN201310185728.1A CN201310185728A CN104168071B CN 104168071 B CN104168071 B CN 104168071B CN 201310185728 A CN201310185728 A CN 201310185728A CN 104168071 B CN104168071 B CN 104168071B
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Abstract
The present invention is applicable to the communications field, provide the method and system of reciprocity calibration between a kind of RRU, described method includes: receives the first calibration reference signal that main RRU is sent by calibration signal sendaisle, and calculates up channel according to described first calibration reference signal；The calibration signal of main RRU receives the main RRU of channel reception and the second calibration reference signal sent from RRU by calibration signal sendaisle, and calculate down channel according to described second calibration reference signal, in order to calculate reciprocity calibration result between RRU according to described up channel result of calculation and described down channel result of calculation；Described main RRU and described carry out between RRU reciprocity calibration from RRU according to reciprocity calibration result between described RRU.Reciprocity between RRU can be made not disturbed by outer signals when calibrating by the present invention.
Description
Technical field
The invention belongs to the communications field, particularly relate to the method and system of reciprocity calibration between a kind of RRU.
Background technology
Channel reciprocity is considered as the big advantage that LTE tdd systems is better than frequency division duplex system.
Up-downgoing channel uses same frequency band, therefore can according to uplink channel estimation down channel, thus improve descending
Transmission performance.But in systems in practice, each antenna of base station and user side have independent reception and
Sending link, channel reciprocity is only applicable to spatial channel, there is not absolute channel reciprocity.Gently
Micro-up-downgoing channel reciprocity error this may result in systematic function and significantly changes.Therefore, in use
Antenna for base station have to be carried out reciprocity calibration before dividing duplex channel reciprocity.
Prior art is carrying out same base station or Remote Radio Unit (Radio Remote Unit is called for short RRU)
In antenna between reciprocity calibration time technology the most comprehensive, but improve base carrying out multipoint cooperative
Stand or during the signal of RRU edge customer, need the reciprocity calibration used between base station or RRU.
Reciprocity calibration between the base station of prior art or RRU uses wireless signal to calibrate, but calibration
Signal can by on-air radio channel multi-path decline cause channel estimation errors, eat dishes without rice or wine to feed back the quantization introduced
The factors impacts such as the channel interpolation error that error, synchronism deviation cause.
Summary of the invention
The embodiment of the present invention is to provide the method and system of reciprocity calibration between a kind of RRU, existing to alleviate
The signal that technology is eated dishes without rice or wine in transmission is to the problem of reciprocity calibration signal disturbing between RRU.
First aspect, embodiments provides the method for reciprocity calibration, described method between a kind of RRU
Including:
Receive the first calibration reference signal that the main RRU of channel reception is sent by calibration signal sendaisle,
And calculate up channel according to described first calibration reference signal；
The calibration signal of main RRU receives the main RRU of channel reception and sends logical from RRU by calibration signal
The second calibration reference signal that road sends, and calculate down channel according to described second calibration reference signal, with
Just reciprocity school between RRU is calculated according to described up channel result of calculation and described down channel result of calculation
Quasi-result；
Described main RRU and described carry out between RRU according to reciprocity calibration result between described RRU from RRU
Reciprocity is calibrated.
In the first possible embodiment of first aspect, lead at the described main RRU of reception channel reception
Before crossing the step of the first calibration reference signal that calibration signal sendaisle sends, described method also includes:
Main RRU and respectively will calibration access port and calibrated channel interconnection means by RF cable from RRU
Being attached, described calibrated channel port is arranged at RRU side, and connects with the calibration signal of described RRU
Receive passage and calibration signal sendaisle connects.
In embodiment possible in the second of first aspect, the main RRU of described reception is by calibration signal
The step of the first calibration reference signal that sendaisle sends, including:
Main RRU sends the first calibration ginseng by calibration signal sendaisle to described calibrated channel interconnection means
Examine signal；
Described first calibration reference signal is divided into multichannel first by power splitter by described calibrated channel interconnection means
Calibration reference signal, and described multichannel the first calibration reference signal is separately sent to described main RRU and described
From RRU；
Described main RRU and the described calibration signal reception passage from RRU receive described multichannel the first school respectively
Quasi-reference signal.
In the third possible embodiment of first aspect, the calibration signal of described main RRU receives passage
Receive main RRU and from the RRU step by the second calibration reference signal of calibration signal sendaisle transmission
Suddenly, including:
Main RRU and send the by calibration signal sendaisle to described calibrated channel interconnection means from RRU
Two calibration reference signals；
Second calibration reference signal described in multichannel is synthesized a road by power splitter by described calibrated channel interconnection means
Second calibration reference signal, and described road second calibration reference signal is separately sent to described main RRU；
The calibration signal of described main RRU receives road second calibration reference signal described in channel reception.
In conjunction with first aspect, the first possible embodiment of first aspect, first aspect the second can
The embodiment of energy and the third possible embodiment of first aspect, at the 4th kind of possible embodiment
In, receive the main RRU of channel reception by calibration signal at described main RRU and the calibration signal from RRU
Before the step of the first calibration reference signal that sendaisle sends, described method also includes:
Main RRU is set, is used at described main RRU from RRU and standby main RRU, described standby main RRU
Use as main RRU when machine, described standby main RRU when described main RRU runs as from RRU
Use.
In conjunction with first aspect, the first possible embodiment of first aspect, first aspect the second can
The embodiment of energy and the third possible embodiment of first aspect, at the 5th kind of possible embodiment
In, receive the main RRU of channel reception by calibration signal at described main RRU and the calibration signal from RRU
Before the step of the first calibration reference signal that sendaisle sends, described method also includes:
When described calibrated channel port is two, RF switch is set at described main RRU, so that passing through
Described RF switch, receives passage by described calibration signal and calibration signal sendaisle is adjusted to different leading to
Road；Or,
When described calibrated channel port is two, RF switch is set in described calibrated channel interconnection means,
So that by described RF switch, described calibration signal being received passage and calibration signal sendaisle is adjusted to
Different passages.
In conjunction with first aspect, the first possible embodiment of first aspect, first aspect the second can
The embodiment of energy and the third possible embodiment of first aspect, at the 6th kind of possible embodiment
In, described main RRU and the calibration signal sendaisle from RRU and calibration signal receive passage, multiplexing RRU
The sendaisle of middle antenna and reception passage.
In conjunction with the 6th kind of possible embodiment of first aspect, in the 7th kind of possible embodiment, institute
State the sendaisle of antenna and reception passage in multiplexing RRU, including:
The sendaisle of same antenna of multiplexing and reception passage；Or,
The sendaisle of multiplexing first antenna and the reception passage of the second antenna.
Second aspect, embodiments provides the system of reciprocity calibration, described system between a kind of RRU
System includes main radio frequency remote unit RRU and from RRU, wherein:
Main RRU is for receiving the first calibration reference that described main RRU is sent by calibration signal sendaisle
Signal, calculates up channel according to described first calibration reference signal, receives described main RRU and from RRU
The second calibration reference signal sent, calculates down channel according to described second calibration reference signal, in order to root
Reciprocity calibration knot between RRU is calculated according to described up channel result of calculation and described down channel result of calculation
Really, and according to reciprocity calibration result between described RRU reciprocity calibration between RRU is carried out；
From RRU for receiving the first calibration reference that described main RRU is sent by calibration signal sendaisle
Signal, sends the second calibration reference signal by calibration signal sendaisle to described main RRU, so that described
Main RRU calculates up channel and according to described second reference signal meter according to described first calibration reference signal
Calculate down channel, and then calculate according to described up channel result of calculation and described down channel result of calculation
Reciprocity calibration result between RRU, and carry out reciprocity between RRU according to reciprocity calibration result between described RRU
Property calibration.
In the first possible embodiment of second aspect, described main RRU and being additionally operable to from RRU:
Main RRU and respectively will calibration access port and calibrated channel interconnection means by RF cable from RRU
Being attached, described calibrated channel port is arranged at RRU side, and connects with the calibration signal of described RRU
Receive passage and calibration signal sendaisle connects.
In the embodiment that the second of second aspect is possible, described main RRU is used for receiving described main RRU
The first calibration reference signal sent by calibration signal sendaisle, including:
Main RRU sends the first calibration ginseng by calibration signal sendaisle to described calibrated channel interconnection means
Examine signal；
Described first calibration reference signal is divided into multichannel first by power splitter by described calibrated channel interconnection means
Calibration reference signal, and described multichannel the first calibration reference signal is separately sent to described main RRU and described
From RRU；
Described main RRU and the described calibration signal reception passage from RRU receive described multichannel the first school respectively
Quasi-reference signal.
In the third possible embodiment of second aspect, the described main RRU of described reception and from RRU
The second calibration reference signal sent, including:
Main RRU and send the by calibration signal sendaisle to described calibrated channel interconnection means from RRU
Two calibration reference signals；
Second calibration reference signal described in multichannel is synthesized a road by power splitter by described calibrated channel interconnection means
Second calibration reference signal, and described road second calibration reference signal is separately sent to described main RRU；
The calibration signal of described main RRU receives road second calibration reference signal described in channel reception.
In conjunction with second aspect, the first possible embodiment of second aspect, second aspect the second can
The embodiment of energy and the third possible embodiment of second aspect, at the 4th kind of possible embodiment
In, described system also includes arranging unit, wherein:
The described unit that arranges is for arranging main RRU, from RRU and standby main RRU, described standby main RRU
For using as main RRU when described main RRU is when machine, described standby main RRU is at described main RRU
Use as from RRU during operation.
In conjunction with second aspect, the first possible embodiment of second aspect, second aspect the second can
The embodiment of energy and the third possible embodiment of second aspect, at the 5th kind of possible embodiment
In, described system also includes arranging unit, wherein:
Described arrange unit for:
When described calibrated channel port is two, RF switch is set at described main RRU, so that passing through
Described RF switch, receives passage by described calibration signal and calibration signal sendaisle is adjusted to different leading to
Road；Or,
When described calibrated channel port is two, RF switch is set in described calibrated channel interconnection means,
So that by described RF switch, described calibration signal being received passage and calibration signal sendaisle is adjusted to
Different passages.
In conjunction with second aspect, the first possible embodiment of second aspect, second aspect the second can
The embodiment of energy and the third possible embodiment of second aspect, at the 6th kind of possible embodiment
In, described main RRU and the calibration signal sendaisle from RRU and calibration signal receive passage, multiplexing RRU
The sendaisle of middle antenna and reception passage.
In conjunction with the 6th kind of possible embodiment of second aspect, in the 7th kind of possible embodiment, institute
State the sendaisle of antenna and reception passage in multiplexing RRU, including:
The sendaisle of same antenna of multiplexing and reception passage；Or,
The sendaisle of multiplexing first antenna and the reception passage of the second antenna.
The embodiment of the present invention, calibration access port is entered with calibrated channel interconnection means by RRU by RF cable
Row connects, and the first calibration reference signal is sent to main RRU and from RRU by RF cable by main RRU,
Main RRU and from RRU according to described first calibration reference signal calculate up channel；Main RRU and from RRU
By RF cable, the second calibration reference signal is sent to main RRU, main RRU according to described second calibration
Reference signal calculates down channel, according to described up channel result of calculation and described down channel result of calculation,
Obtain the reciprocity calibration result between RRU so that when sending reciprocity calibration signal between RRU, it is to avoid
Because the impact that the signal in air interface transmission is on reciprocity calibration signal, improve reciprocity calibration between RRU
Accuracy.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, below will be to embodiment or existing skill
In art description, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only
It is only some embodiments of the present invention, for those of ordinary skill in the art, is not paying creative labor
On the premise of dynamic property, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
The schematic diagram of reciprocity calibration system between the RRU that Fig. 1 provides for the embodiment of the present invention；
The flow chart of reciprocity calibration steps between the RRU that Fig. 2 provides for the embodiment of the present invention；
Fig. 3 is the structure chart of reciprocity calibration system between the RRU that the embodiment of the present invention provides.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and reality
Execute example, the present invention is further elaborated.Only should be appreciated that specific embodiment described herein
Only in order to explain the present invention, it is not intended to limit the present invention.
The embodiment of the present invention, calibration access port is entered with calibrated channel interconnection means by RRU by RF cable
Row connects, and the first calibration reference signal is sent to main RRU and from RRU by RF cable by main RRU,
Main RRU and from RRU according to described first calibration reference signal calculate up channel；Main RRU and from RRU
By RF cable, the second calibration reference signal is sent to main RRU, main RRU according to described second calibration
Reference signal calculates down channel, according to described up channel result of calculation and described down channel result of calculation,
Obtain the reciprocity calibration result between RRU so that when sending reciprocity calibration signal between RRU, it is to avoid
Because the impact that the signal in air interface transmission is on reciprocity calibration signal, improve reciprocity calibration between RRU
Accuracy.
In order to technical solutions according to the invention are described, illustrate below by specific embodiment.
Embodiment one
Reciprocity is calibrated the structure chart of system by the RRU that being illustrated in figure 1 the embodiment of the present invention provides, including:
Calibration access port is attached with calibrated channel interconnection means by RRU by RF cable, and main RRU leads to
Cross RF cable and the first calibration reference signal is sent to main RRU and from RRU, main RRU and from RRU
Up channel is calculated according to described first calibration reference signal；Main RRU and from RRU by RF cable will
Second calibration reference signal is sent to main RRU, main RRU according under described second calibration reference signal calculating
Row channel, according to described up channel result of calculation and described down channel result of calculation, obtains between RRU
Reciprocity calibration result so that when sending reciprocity calibration signal between RRU, it is to avoid because air interface transmission
In the signal impact on reciprocity calibration signal, improve the accuracy of the calibration of reciprocity between RRU.
Embodiment two
It is illustrated in figure 2 the flow chart of reciprocity calibration steps between the RRU that the embodiment of the present invention provides, described
Method comprises the following steps:
In step s 201, main RRU and the calibration signal reception main RRU of channel reception from RRU passes through
The first calibration reference signal that calibration signal sendaisle sends, and according to described first calibration reference signal meter
Calculating up channel, described first calibration reference signal is transmitted by described RF cable.
In embodiments of the present invention, at main RRU with after RRU interconnects, main RRU is believed by calibration
Number sendaisle sends the first calibration reference signal (i.e. up channel calibration reference signal), main RRU and from
The calibration signal of RRU receives the first calibration reference signal described in channel reception, and according to described first calibration ginseng
Examining signal and calculate up channel, described first calibration reference signal is at RF cable special secondary school in transmittance process
Pass.Described main RRU and the calibration signal from RRU receive the main RRU of channel reception by calibration signal
The step of the first calibration reference signal that sendaisle sends, including:
1, main RRU sends the first calibration by calibration signal sendaisle to described calibrated channel interconnection means
Reference signal.
In embodiments of the present invention, the first calibration reference signal that main RRU sends, first via RF cable
It is sent to calibrated channel interconnection means.
2, described first calibration reference signal is divided into multichannel by power splitter by described calibrated channel interconnection means
One calibration reference signal, and described multichannel the first calibration reference signal is separately sent to described main RRU and from
RRU。
In embodiments of the present invention, described first calibration reference is believed by calibrated channel interconnection means by power splitter
Number being divided into multichannel the first calibration reference signal, RF cable of wherein leading up to returns to main RRU, i.e. returns
Calibration signal to main RRU receives passage, and other the first calibration reference signal is then sent by RF cable
Passage is received to from the calibration signal of RRU.
3, main RRU and the calibration signal from RRU receive multichannel first described in channel reception and calibrate reference letter
Number.
In embodiments of the present invention, main RRU and from RRU after receiving the first calibration reference signal,
Calculating up channel according to described first calibration reference signal, it calculates process and uses prior art, at this not
Repeat.
In step S202, the calibration signal of main RRU receives the main RRU of channel reception and passes through from RRU
The second calibration reference signal that calibration signal sendaisle sends, and according to described second calibration reference signal meter
Calculate down channel, in order to calculate according to described up channel result of calculation and described down channel result of calculation
Reciprocity calibration result between RRU, described second calibration reference signal is transmitted by described RF cable.
In embodiments of the present invention, main RRU and from RRU interconnect after, main RRU and from RRU lead to
Cross calibration signal sendaisle and send the second calibration reference signal (i.e. down channel calibration reference signal), main
The calibration signal of RRU receives the second calibration reference signal described in channel reception, and according to described second calibration ginseng
Examining signal and calculate down channel, described second calibration reference signal is at RF cable special secondary school in transmittance process
Pass.It addition, base station is after getting up channel result of calculation and down channel result of calculation, according to
Described result calculates the reciprocity calibration result between RRU, the reciprocity calibration result between described calculating RRU
Method use prior art, therefore not to repeat here.Wherein, the calibration signal of described main RRU receives passage
Receive main RRU and from the RRU step by the second calibration reference signal of calibration signal sendaisle transmission
Suddenly, including:
1, main RRU and from RRU by calibration signal sendaisle send out to described calibrated channel interconnection means
Send the second calibration reference signal.
In embodiments of the present invention, main RRU and the second calibration reference signal sent from RRU, first warp
It is sent to calibrated channel interconnection means by RF cable.
2, the second calibration reference signal described in multichannel is synthesized one by power splitter by described calibrated channel interconnection means
Road the second calibration reference signal, and described road second calibration reference signal is separately sent to described master
RRU。
In embodiments of the present invention, described multichannel second is calibrated ginseng by power splitter by calibrated channel interconnection means
Examine signal syntheses one tunnel the second calibration reference signal, and described road second calibration reference signal is passed through radio frequency
Cable returns to main RRU, and the calibration signal i.e. returning to main RRU receives passage.
3, the calibration signal of main RRU receives road second calibration reference signal described in channel reception.
In embodiments of the present invention, main RRU is after receiving the second calibration reference signal, according to described
Two calibration reference signals calculate down channel, and it calculates process and uses prior art, and therefore not to repeat here.
In step S203, described main RRU and described calibrate according to reciprocity between described RRU from RRU
Result carries out reciprocity calibration between RRU.
The embodiment of the present invention, calibration access port is entered with calibrated channel interconnection means by RRU by RF cable
Row connects, and the first calibration reference signal is sent to main RRU and from RRU by RF cable by main RRU,
Main RRU and from RRU according to described first calibration reference signal calculate up channel；Main RRU and from RRU
By RF cable, the second calibration reference signal is sent to main RRU, main RRU according to described second calibration
Reference signal calculates down channel, according to described up channel result of calculation and described down channel result of calculation,
Obtain the reciprocity calibration result between RRU so that when sending reciprocity calibration signal between RRU, it is to avoid
Because the impact that the signal in air interface transmission is on reciprocity calibration signal, improve reciprocity calibration between RRU
Accuracy.
As an alternative embodiment of the present invention, receive at described main RRU and the calibration signal from RRU
The first calibration reference signal that the main RRU of channel reception is sent by calibration signal sendaisle, and according to described
Before first calibration reference signal calculates the step of up channel, described method also includes:
Main RRU and respectively will calibration access port and calibrated channel interconnection means by RF cable from RRU
Being attached, described calibrated channel port is positioned at RRU side, and receives passage and calibration letter with calibration signal
Number sendaisle connects, and described calibrated channel port is connected with calibrated channel.
In embodiments of the present invention, calibrated channel is that (Radio Remote Unit is called for short Remote Radio Unit
RRU) send calibration reference signal and receive the passage of calibration reference signal, in RRU, generally comprising two
Individual calibrated channel, i.e. calibration signal receive passage and calibration signal sendaisle, calibrated channel in RRU with
Calibrated channel port connects.It is logical with calibration that multiple RRU in base station will calibrate access port by RF cable
Road interconnection means is attached, so by RF cable, calibrated channel port, calibrated channel interconnection means
Multiple RRU in base station can be interconnected, the most main RRU and coupling together from RRU.
As another alternative embodiment of the invention, at described main RRU with pass through radio frequency respectively from RRU
Before the step that calibration access port and calibrated channel interconnection means are attached by cable, described method is also wrapped
Include:
Main RRU is set, is used at described main RRU from RRU and standby main RRU, described standby main RRU
Use as main RRU when machine, described standby main RRU when described main RRU runs as from RRU
Use.
In embodiments of the present invention, before interconnection, needing, main RRU is set, from RRU and standby main RRU,
Its setting up procedure can be arranged as required to, and does not limits at this.It is pointed out that standby main RRU uses
In using as main RRU when described main RRU is when machine, described standby main RRU transports at described main RRU
Use as from RRU during row.
As another alternative embodiment of the invention, connect at described main RRU and the calibration signal from RRU
Receive the main RRU of channel reception by calibration signal sendaisle send the first calibration reference signal step it
Before, described method also includes:
When described calibrated channel port is two, at described main RRU, RF switch is installed, so that passing through
Described RF switch, receives passage by described calibration signal and calibration signal sendaisle is adjusted to different leading to
Road；Or,
When described calibrated channel port is two, in described calibrated channel interconnection means, RF switch is installed,
So that by described RF switch, described calibration signal being received passage and calibration signal sendaisle is adjusted to
Different passages.
In embodiments of the present invention, it is generally the case that calibrated channel port only one of which, calibration signal receives
Passage and calibration signal sendaisle is all connected with this calibrated channel port because the first calibration reference signal and
Second calibration reference signal staggers transmission, thus without situation conflict occur.If but calibrated channel
Port is two, and calibration signal receives passage and calibration signal sendaisle is connected with one of them respectively,
Then with it to more preferable effect, one RF switch can be installed the most in a base station, by described calibration letter
Number receive passage and calibration signal sendaisle be adjusted to different passages.
As another alternative embodiment of the invention,
Described main RRU and the calibration signal sendaisle from RRU and calibration signal receive passage, multiplexing
The sendaisle of antenna and reception passage in RRU.
In embodiments of the present invention, in above-described embodiment, it is all two passages to be installed in RRU as calibration
Signal receives passage and calibrates the designated lane of signal sendaisle, and the existing reception of antenna ready-made in RRU
Passage and sendaisle, therefore can be with the reception passage of multiplex antenna and sendaisle, it is pointed out that:
The sendaisle of same antenna of multiplexing and reception passage；Or,
The sendaisle of multiplexing first antenna and the reception passage of the second antenna.
Embodiment three
It is illustrated in figure 3 the structure chart of reciprocity calibration system between the RRU that the embodiment of the present invention provides, in order to
Be easy to explanation, only illustrate the part relevant to the embodiment of the present invention, described system include main RRU1 and from
RRU2, wherein:
Main RRU1 is sent by calibration signal for receiving main RRU1 described in channel reception by calibration signal
The first calibration reference signal that passage sends, calculates up channel according to described first calibration reference signal, connects
Receive described main RRU1 and the second calibration reference signal sent from RRU2, according to described second calibration reference
Signal calculates down channel, in order to according to described up channel result of calculation and described down channel result of calculation
Calculate reciprocity calibration result between RRU, and carry out RRU according to reciprocity calibration result between described RRU
Between reciprocity calibration, described first calibration reference signal and described second calibration reference signal pass through RF cable
Transmission.
Sent by calibration signal for receiving described main RRU1 by calibration signal receiving unit from RRU2
The first calibration reference signal that passage sends, sends the by calibration signal sendaisle to described main RRU1
Two calibration reference signals, so that described main RRU1 calculates up channel according to described first calibration reference signal
Down channel is calculated with according to described second reference signal, and then according to described up channel result of calculation and institute
State down channel result of calculation and calculate reciprocity calibration result between RRU, and according to reciprocity between described RRU
Calibration result carries out reciprocity calibration between RRU.
In embodiments of the present invention, at main RRU1 with after RRU2 interconnects, main RRU1 is by calibration
Signal sendaisle sends the first calibration reference signal (i.e. up channel calibration reference signal), main RRU1
The first calibration reference signal described in channel reception is received with the calibration signal from RRU2, and according to described first
Calibration reference signal calculates up channel, and described first calibration reference signal is at radio frequency line in transmittance process
Special delivery in cable.
Main RRU1 and from RRU2 interconnect after, main RRU1 and from RRU2 by calibration signal send
Passage sends the second calibration reference signal (i.e. down channel calibration reference signal), the calibration letter of main RRU1
Number receive the second calibration reference signal described in channel reception, and under calculating according to described second calibration reference signal
Row channel, the special delivery in RF cable in transmittance process of described second calibration reference signal.It addition,
Base station, after getting up channel result of calculation and down channel result of calculation, calculates according to described result
Reciprocity calibration result between RRU, the method for the reciprocity calibration result between described calculating RRU uses existing
Having technology, therefore not to repeat here.
Wherein, described main RRU1 and respectively will calibration access port and calibration by RF cable from RRU2
Passage interconnection means is attached, and described calibrated channel port is arranged at RRU side, and with described RRU
Calibration signal receive passage and calibration signal sendaisle connect.
In embodiments of the present invention, calibrated channel is that (Radio Remote Unit is called for short Remote Radio Unit
RRU) send calibration reference signal and receive the passage of calibration reference signal, in RRU, generally comprising two
Individual calibrated channel, i.e. calibration signal receive passage and calibration signal sendaisle, calibrated channel in RRU with
Calibrated channel port connects.It is logical with calibration that multiple RRU in base station will calibrate access port by RF cable
Road interconnection means is attached, so by RF cable, calibrated channel port, calibrated channel interconnection means
Multiple RRU in base station can be interconnected, the most main RRU and coupling together from RRU.
Wherein, described main RRU1 passes through school for receiving main RRU1 described in channel reception by calibration signal
The first calibration reference signal that calibration signal sendaisle sends, including:
Main RRU1 sends the first calibration ginseng by calibration signal sendaisle to described calibrated channel interconnection means
Examine signal；
Described first calibration reference signal is divided into multichannel first by power splitter by described calibrated channel interconnection means
Calibration reference signal, and described multichannel the first calibration reference signal is separately sent to described main RRU1 and institute
State from RRU2；
Described main RRU1 and the described calibration signal reception passage from RRU2 receive described multichannel first respectively
Calibration reference signal.
Wherein, the described main RRU1 of described reception and the second calibration reference signal sent from RRU2, including:
Main RRU1 and from RRU2 by calibration signal sendaisle send to described calibrated channel interconnection means
Second calibration reference signal；
Second calibration reference signal described in multichannel is synthesized a road by power splitter by described calibrated channel interconnection means
Second calibration reference signal, and described road second calibration reference signal is separately sent to described main RRU1；
The calibration signal of described main RRU1 receives road second calibration reference signal described in channel reception.
The embodiment of the present invention, calibration access port is entered with calibrated channel interconnection means by RRU by RF cable
Row connects, main RRU1 by RF cable the first calibration reference signal is sent to main RRU1 and from
RRU2, main RRU1 and from RRU2 according to described first calibration reference signal calculate up channel；Main RRU1
With from RRU2 by RF cable the second calibration reference signal is sent to main RRU1, main RRU1 according to
Described second calibration reference signal calculates down channel, according to described up channel result of calculation and described descending
Channel calculation result, obtains the reciprocity calibration result between RRU so that send reciprocity school between RRU
During calibration signal, it is to avoid because the impact that the signal in air interface transmission is on reciprocity calibration signal, improve
The accuracy of reciprocity calibration between RRU.
As an alternative embodiment of the present invention, described system also includes arranging unit, wherein:
The described unit that arranges is for arranging main RRU, from RRU and standby main RRU, described standby main RRU
For using as main RRU when described main RRU is when machine, described standby main RRU is at described main RRU
Use as from RRU during operation.
As another alternative embodiment of the invention, described system also includes arranging unit, wherein:
Described arrange unit for:
When described calibrated channel port is two, RF switch is set at described main RRU, so that passing through
Described RF switch, receives passage by described calibration signal and calibration signal sendaisle is adjusted to different leading to
Road；Or,
When described calibrated channel port is two, RF switch is set in described calibrated channel interconnection means,
So that by described RF switch, described calibration signal being received passage and calibration signal sendaisle is adjusted to
Different passages.
As another alternative embodiment of the invention, described main RRU and the calibration signal from RRU send
Passage and calibration signal receive passage, the sendaisle of antenna and reception passage in multiplexing RRU.
In embodiments of the present invention, in above-described embodiment, it is all two passages to be installed in RRU as calibration
Signal receives passage and calibrates the designated lane of signal sendaisle, and the existing reception of antenna ready-made in RRU
Passage and sendaisle, therefore can be with the reception passage of multiplex antenna and sendaisle, it is pointed out that:
The sendaisle of same antenna of multiplexing and reception passage；Or,
The sendaisle of multiplexing first antenna and the reception passage of the second antenna.
One of ordinary skill in the art will appreciate that the unit included by above-described embodiment is according to merit
Logic can carry out dividing, but be not limited to above-mentioned division, as long as being capable of corresponding function；
It addition, the specific name of each functional unit is also only to facilitate mutually distinguish, it is not limited to the present invention
Protection domain.
Claims (16)
1. the method for reciprocity calibration between a RRU, it is characterised in that described method includes:
Main RRU receives the first calibration reference signal that main RRU is sent by calibration signal sendaisle, and
Up channel is calculated according to described first calibration reference signal；
The calibration signal of main RRU receives the main RRU of channel reception and sends logical from RRU by calibration signal
The second calibration reference signal that road sends, and calculate down channel according to described second calibration reference signal, with
Just reciprocity school between RRU is calculated according to described up channel result of calculation and described down channel result of calculation
Quasi-result；
Described main RRU and described carry out between RRU according to reciprocity calibration result between described RRU from RRU
Reciprocity is calibrated；
Wherein, described first calibration reference signal and described second calibration reference signal are to be passed by RF cable
Defeated.
2. the method for claim 1, it is characterised in that at the main RRU of described reception by calibration
Before the step of the first calibration reference signal that signal sendaisle sends, described method also includes:
Main RRU and respectively will calibration access port and calibrated channel interconnection means by RF cable from RRU
Being attached, described calibrated channel port is arranged at RRU side, and connects with the calibration signal of described RRU
Receive passage and calibration signal sendaisle connects.
3. the method for claim 1, it is characterised in that the main RRU of described reception is believed by calibration
The step of the first calibration reference signal that number sendaisle sends, including:
Main RRU sends the first calibration with reference to letter by calibration signal sendaisle to calibrated channel interconnection means
Number；
Described first calibration reference signal is divided into multichannel first by power splitter by described calibrated channel interconnection means
Calibration reference signal, and described multichannel the first calibration reference signal is separately sent to described main RRU and described
From RRU；
Described main RRU and the described calibration signal reception passage from RRU receive described multichannel the first school respectively
Quasi-reference signal.
4. the method for claim 1, it is characterised in that the calibration signal of described main RRU receives
Channel reception main RRU and the second calibration reference signal sent by calibration signal sendaisle from RRU
Step, including:
Main RRU and from RRU by calibration signal sendaisle send the second school to calibrated channel interconnection means
Quasi-reference signal；
Second calibration reference signal described in multichannel is synthesized a road by power splitter by described calibrated channel interconnection means
Second calibration reference signal, and described road second calibration reference signal is separately sent to described main RRU；
The calibration signal of described main RRU receives road second calibration reference signal described in channel reception.
5. the method as described in any one of Claims 1 to 4, it is characterised in that described main RRU and from
The calibration signal of RRU receives the first calibration that the main RRU of channel reception is sent by calibration signal sendaisle
Before the step of reference signal, described method also includes:
Main RRU is set, is used at described main RRU from RRU and standby main RRU, described standby main RRU
Use as main RRU when machine, described standby main RRU when described main RRU runs as from RRU
Use.
6. method as claimed in claim 2, it is characterised in that at described main RRU with from RRU's
Calibration signal receives the main RRU of channel reception the first calibration by calibration signal sendaisle transmission with reference to letter
Number step before, described method also includes:
When described calibrated channel port is two, RF switch is set at described main RRU, so that passing through
Described RF switch, receives passage by described calibration signal and calibration signal sendaisle is adjusted to different leading to
Road；Or,
When described calibrated channel port is two, RF switch is set in described calibrated channel interconnection means,
So that by described RF switch, described calibration signal being received passage and calibration signal sendaisle is adjusted to
Different passages.
7. the method as described in any one of Claims 1 to 4, it is characterised in that described main RRU and from RRU
Calibration signal sendaisle and calibration signal receive passage, the sendaisle of antenna and reception in multiplexing RRU
Passage.
8. method as claimed in claim 7, it is characterised in that the transmission of antenna in described multiplexing RRU
Passage and reception passage, including:
The sendaisle of same antenna of multiplexing and reception passage；Or,
The sendaisle of multiplexing first antenna and the reception passage of the second antenna.
9. the system of reciprocity calibration between a RRU, it is characterised in that described system includes that main radio frequency draws
Remote unit R RU and from RRU, wherein:
Main RRU is for receiving the first calibration reference that described main RRU is sent by calibration signal sendaisle
Signal, calculates up channel according to described first calibration reference signal, receives described main RRU and from RRU
The second calibration reference signal sent, calculates down channel according to described second calibration reference signal, in order to root
Reciprocity calibration knot between RRU is calculated according to described up channel result of calculation and described down channel result of calculation
Really, and according to reciprocity calibration result between described RRU reciprocity calibration between RRU is carried out；
From RRU for receiving the first calibration reference that described main RRU is sent by calibration signal sendaisle
Signal, sends the second calibration reference signal by calibration signal sendaisle to described main RRU, so that described
Main RRU calculates up channel and according to described second calibration with reference to letter according to described first calibration reference signal
Number calculate down channel, and then according to described up channel result of calculation and described down channel result of calculation meter
Calculate reciprocity calibration result between RRU, and carry out between RRU according to reciprocity calibration result between described RRU
Reciprocity is calibrated；
Wherein, described first calibration reference signal and described second calibration reference signal are to be passed by RF cable
Defeated.
10. system as claimed in claim 9, it is characterised in that described main RRU and also using from RRU
In:
Main RRU and respectively will calibration access port and calibrated channel interconnection means by RF cable from RRU
Being attached, described calibrated channel port is arranged at RRU side, and connects with the calibration signal of described RRU
Receive passage and calibration signal sendaisle connects.
11. systems as claimed in claim 9, it is characterised in that described main RRU is used for receiving described
The first calibration reference signal that main RRU is sent by calibration signal sendaisle, including:
Main RRU sends the first calibration with reference to letter by calibration signal sendaisle to calibrated channel interconnection means
Number；
Described first calibration reference signal is divided into multichannel first by power splitter by described calibrated channel interconnection means
Calibration reference signal, and described multichannel the first calibration reference signal is separately sent to described main RRU and described
From RRU；
Described main RRU and the described calibration signal reception passage from RRU receive described multichannel the first school respectively
Quasi-reference signal.
12. systems as claimed in claim 9, it is characterised in that the described main RRU of described reception and from
The second calibration reference signal that RRU sends, including:
Main RRU and from RRU by calibration signal sendaisle send the second school to calibrated channel interconnection means
Quasi-reference signal；
Second calibration reference signal described in multichannel is synthesized a road by power splitter by described calibrated channel interconnection means
Second calibration reference signal, and described road second calibration reference signal is separately sent to described main RRU；
The calibration signal of described main RRU receives road second calibration reference signal described in channel reception.
13. systems as described in any one of claim 9～12, it is characterised in that described system also includes setting
Put unit, wherein:
The described unit that arranges is for arranging main RRU, from RRU and standby main RRU, described standby main RRU
For using as main RRU when described main RRU is when machine, described standby main RRU is at described main RRU
Use as from RRU during operation.
14. systems as claimed in claim 10, it is characterised in that described system also includes arranging unit,
Wherein:
Described arrange unit for:
When described calibrated channel port is two, RF switch is set at described main RRU, so that passing through
Described RF switch, receives passage by described calibration signal and calibration signal sendaisle is adjusted to different leading to
Road；Or,
When described calibrated channel port is two, RF switch is set in described calibrated channel interconnection means,
So that by described RF switch, described calibration signal being received passage and calibration signal sendaisle is adjusted to
Different passages.
15. systems as described in any one of claim 9～12, it is characterised in that described main RRU and from
The calibration signal sendaisle of RRU and calibration signal receive passage, the sendaisle of antenna in multiplexing RRU
With reception passage.
16. systems as claimed in claim 15, it is characterised in that in described multiplexing RRU, antenna sends out
Send passage and receive passage, including:
The sendaisle of same antenna of multiplexing and reception passage；Or,
The sendaisle of multiplexing first antenna and the reception passage of the second antenna.
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| CN105471523B (en) * | 2015-11-17 | 2017-09-08 | 东南大学 | The collaboration diversity reciprocity calibration method of multiaerial system |
| US10033558B2 (en) * | 2016-10-04 | 2018-07-24 | Qualcomm Incorporated | Inter-eNB over-the-air calibration for reciprocity-based coordinated multipoint communications |
| US11632152B2 (en) | 2017-01-09 | 2023-04-18 | Qualcomm Incorporated | Over-the-air calibration for reciprocity based UL MIMO transmission |
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