CN104168071A - A method and system for calibrating reciprocity between RRUs - Google Patents

A method and system for calibrating reciprocity between RRUs Download PDF

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Publication number
CN104168071A
CN104168071A CN201310185728.1A CN201310185728A CN104168071A CN 104168071 A CN104168071 A CN 104168071A CN 201310185728 A CN201310185728 A CN 201310185728A CN 104168071 A CN104168071 A CN 104168071A
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rru
signal
calibration
main
sendaisle
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CN104168071B (en
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戎璐
毕晓艳
郭文婷
蒋镇军
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

The invention is suitable for the communication field and provides a method and system for calibrating reciprocity between RRUs. The method comprises the following steps: a first calibration reference signal sent by a master RRU through a calibration signal sending channel is received, and an uplink channel is calculated according to the first calibration reference signal; a calibration signal reception channel of the master RRU receives second calibration reference signals sent by the master RRU and a slave RRU through calibration signal sending channels, and calculating a downlink channel according to the second calibration reference signals so as to calculate the result of the reciprocity calibration between the RRUs; and the master RRU and the slave RRU carry out reciprocity calibration between the RRUs according to the result of the reciprocity calibration between the RRUs. Through the method and system for calibrating the reciprocity between the RRUs, the reciprocity calibration can carried out between the RRUs without being influenced by the interference of external signals.

Description

The method and system of reciprocity calibration between a kind of RRU
Technical field
The invention belongs to the communications field, relate in particular to the method and system of reciprocity calibration between a kind of RRU.
Background technology
Channel reciprocity is considered to the large advantage that LTE tdd systems is better than frequency division duplex system.Up-downgoing channel is used same frequency band, thus can be according to uplink channel estimation down channel, thus improve downlink transfer performance.Yet in real system, each antenna of base station and user side has and independently receives and send link, and channel reciprocity is only applicable to spatial channel, does not have absolute channel reciprocity.Slight up-downgoing channel reciprocity error just may cause systematic function significantly to change.Therefore, must carry out reciprocity calibration to antenna for base station before dividing in use duplex channel reciprocity.
The technology when reciprocity between the antenna of prior art in carrying out same base station or Remote Radio Unit (Radio Remote Unit is called for short RRU) is calibrated is very comprehensive, but when carrying out the signal of multipoint cooperative raising base station or RRU edge customer, need to use the reciprocity calibration between base station or RRU.
The calibration of the base station of prior art or the reciprocity between RRU is used wireless signal to calibrate, but calibrating signal can be subject to the channel estimation errors that the decline of on-air radio channel multi-path causes, the quantization error that the feedback of eating dishes without rice or wine is introduced, the many factors such as channel interpolation error that synchronism deviation causes.
Summary of the invention
The embodiment of the present invention is to provide the method and system of the calibration of reciprocity between a kind of RRU, the problem of reciprocity calibrating signal between RRU being disturbed to alleviate the signal of prior art in eating dishes without rice or wine to transmit.
First aspect, the embodiment of the present invention provides the method for reciprocity calibration between a kind of RRU, and described method comprises:
Receive path receives the first calibration reference signal that main RRU sends by calibrating signal sendaisle, and calculates up channel according to described the first calibration reference signal;
The second calibration reference signal that the calibrating signal receive path of main RRU receives main RRU and sends by calibrating signal sendaisle from RRU, and calculate down channel according to described the second calibration reference signal, 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 describedly carry out between RRU reciprocity calibration from RRU according to reciprocity calibration result between described RRU.
In the possible execution mode of the first of first aspect, receive the step of the first calibration reference signal that main RRU sends by calibrating signal sendaisle at described receive path before, described method also comprises:
Main RRU with from RRU, by RF cable, calibration access port is connected with calibrated channel interconnection device respectively, described calibrated channel port is arranged at RRU side, and is connected with calibrating signal sendaisle with the calibrating signal receive path of described RRU.
First aspect second in possible execution mode, the step of the first calibration reference signal that the main RRU of described reception sends by calibrating signal sendaisle, comprising:
Main RRU sends the first calibration reference signal by calibrating signal sendaisle to described calibrated channel interconnection device;
Described calibrated channel interconnection device is divided into multichannel the first calibration reference signal by power splitter by described the first calibration reference signal, and described multichannel the first calibration reference signal is sent to respectively to described main RRU and described from RRU;
Described main RRU and described calibrating signal receive path from RRU receive respectively described multichannel the first calibration reference signal.
In the third possible execution mode of first aspect, the calibrating signal receive path of described main RRU receives main RRU and the step of the second calibration reference signal of sending by calibrating signal sendaisle from RRU, comprising:
Main RRU and send the second calibration reference signal by calibrating signal sendaisle to described calibrated channel interconnection device from RRU;
Described calibrated channel interconnection device synthesizes road second calibration reference signal by power splitter by the second calibration reference signal described in multichannel, and described road second calibration reference signal is sent to respectively to described main RRU;
The calibrating signal receive path of described main RRU receives described road second calibration reference signal.
The third possible execution mode in conjunction with the possible execution mode of the second of the possible execution mode of the first of first aspect, first aspect, first aspect and first aspect, in the 4th kind of possible execution mode, receive the step of the first calibration reference signal that main RRU sends by calibrating signal sendaisle at described main RRU with from the calibrating signal receive path of RRU before, described method also comprises:
Main RRU is set, from RRU and standby main RRU, described standby main RRU is for using as main RRU during when machine at described main RRU, described standby main RRU when described main RRU moves as using from RRU.
The third possible execution mode in conjunction with the possible execution mode of the second of the possible execution mode of the first of first aspect, first aspect, first aspect and first aspect, in the 5th kind of possible execution mode, receive the step of the first calibration reference signal that main RRU sends by calibrating signal sendaisle at described main RRU with from the calibrating signal receive path of RRU before, described method also comprises:
When described calibrated channel port is two, at described main RRU, radio-frequency (RF) switch is set, so that by described radio-frequency (RF) switch, described calibrating signal receive path and calibrating signal sendaisle are adjusted to different passages; Or,
When described calibrated channel port is two, at described calibrated channel interconnection device, radio-frequency (RF) switch is set, so that by described radio-frequency (RF) switch, described calibrating signal receive path and calibrating signal sendaisle are adjusted to different passages.
The third possible execution mode in conjunction with the possible execution mode of the second of the possible execution mode of the first of first aspect, first aspect, first aspect and first aspect, in the 6th kind of possible execution mode, described main RRU and from calibrating signal sendaisle and the calibrating signal receive path of RRU, the sendaisle of antenna and receive path in multiplexing RRU.
In conjunction with the 6th kind of possible execution mode of first aspect, in the 7th kind of possible execution mode, sendaisle and the receive path of antenna in described multiplexing RRU, comprising:
The sendaisle of multiplexing same antenna and receive path; Or,
The receive path of the sendaisle of multiplexing the first antenna and the second antenna.
Second aspect, the embodiment of the present invention provides the system of the calibration of reciprocity between a kind of RRU, and described system comprises main radio frequency remote unit RRU and from RRU, wherein:
Main RRU is for receiving the first calibration reference signal that described main RRU sends by calibrating signal sendaisle, according to described the first calibration reference signal, calculate up channel, the second calibration reference signal that receives described main RRU and send from RRU, according to described the second calibration reference signal, calculate down channel, to calculate reciprocity calibration result between RRU according to described up channel result of calculation and described down channel result of calculation, and carry out reciprocity calibration between RRU according to reciprocity calibration result between described RRU;
From RRU, be used for receiving the first calibration reference signal that described main RRU sends by calibrating signal sendaisle, by calibrating signal sendaisle, to described main RRU, send the second calibration reference signal, so that described main RRU calculates up channel and calculates down channel according to described the second reference signal according to described the first calibration reference signal, and then calculate reciprocity calibration result between RRU according to described up channel result of calculation and described down channel result of calculation, and carry out reciprocity calibration between RRU according to reciprocity calibration result between described RRU.
In the possible execution mode of the first of second aspect, described main RRU and from RRU also for:
Main RRU with from RRU, by RF cable, calibration access port is connected with calibrated channel interconnection device respectively, described calibrated channel port is arranged at RRU side, and is connected with calibrating signal sendaisle with the calibrating signal receive path of described RRU.
In the possible execution mode of the second of second aspect, described main RRU, for receiving the first calibration reference signal that described main RRU sends by calibrating signal sendaisle, comprising:
Main RRU sends the first calibration reference signal by calibrating signal sendaisle to described calibrated channel interconnection device;
Described calibrated channel interconnection device is divided into multichannel the first calibration reference signal by power splitter by described the first calibration reference signal, and described multichannel the first calibration reference signal is sent to respectively to described main RRU and described from RRU;
Described main RRU and described calibrating signal receive path from RRU receive respectively described multichannel the first calibration reference signal.
In the third possible execution mode of second aspect, the described main RRU of described reception and the second calibration reference signal sending from RRU, comprising:
Main RRU and send the second calibration reference signal by calibrating signal sendaisle to described calibrated channel interconnection device from RRU;
Described calibrated channel interconnection device synthesizes road second calibration reference signal by power splitter by the second calibration reference signal described in multichannel, and described road second calibration reference signal is sent to respectively to described main RRU;
The calibrating signal receive path of described main RRU receives described road second calibration reference signal.
The third possible execution mode in conjunction with the possible execution mode of the second of the possible execution mode of the first of second aspect, second aspect, second aspect and second aspect, in the 4th kind of possible execution mode, described system also comprises setting unit, wherein:
Described setting unit is used for arranging main RRU, from RRU and standby main RRU, described standby main RRU is for using as main RRU during when machine at described main RRU, described standby main RRU when described main RRU moves as using from RRU.
The third possible execution mode in conjunction with the possible execution mode of the second of the possible execution mode of the first of second aspect, second aspect, second aspect and second aspect, in the 5th kind of possible execution mode, described system also comprises setting unit, wherein:
Described setting unit is used for:
When described calibrated channel port is two, at described main RRU, radio-frequency (RF) switch is set, so that by described radio-frequency (RF) switch, described calibrating signal receive path and calibrating signal sendaisle are adjusted to different passages; Or,
When described calibrated channel port is two, at described calibrated channel interconnection device, radio-frequency (RF) switch is set, so that by described radio-frequency (RF) switch, described calibrating signal receive path and calibrating signal sendaisle are adjusted to different passages.
The third possible execution mode in conjunction with the possible execution mode of the second of the possible execution mode of the first of second aspect, second aspect, second aspect and second aspect, in the 6th kind of possible execution mode, described main RRU and from calibrating signal sendaisle and the calibrating signal receive path of RRU, the sendaisle of antenna and receive path in multiplexing RRU.
In conjunction with the 6th kind of possible execution mode of second aspect, in the 7th kind of possible execution mode, sendaisle and the receive path of antenna in described multiplexing RRU, comprising:
The sendaisle of multiplexing same antenna and receive path; Or,
The receive path of the sendaisle of multiplexing the first antenna and the second antenna.
The embodiment of the present invention, RRU is connected calibration access port by RF cable with calibrated channel interconnection device, main RRU sends to main RRU by RF cable by the first calibration reference signal and from RRU, main RRU and calculate up channel according to described the first calibration reference signal from RRU; Main RRU and by RF cable, the second calibration reference signal is sent to main RRU from RRU, main RRU calculates down channel according to described the second calibration reference signal, according to described up channel result of calculation and described down channel result of calculation, obtain the reciprocity calibration result between RRU, while making to send reciprocity calibrating signal between RRU, avoided because the impact of the signal of eating dishes without rice or wine in transmission on reciprocity calibrating signal improved the accuracy of reciprocity calibration between RRU.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
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 provides of the embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The embodiment of the present invention, RRU is connected calibration access port by RF cable with calibrated channel interconnection device, main RRU sends to main RRU by RF cable by the first calibration reference signal and from RRU, main RRU and calculate up channel according to described the first calibration reference signal from RRU; Main RRU and by RF cable, the second calibration reference signal is sent to main RRU from RRU, main RRU calculates down channel according to described the second calibration reference signal, according to described up channel result of calculation and described down channel result of calculation, obtain the reciprocity calibration result between RRU, while making to send reciprocity calibrating signal between RRU, avoided because the impact of the signal of eating dishes without rice or wine in transmission on reciprocity calibrating signal improved the accuracy of reciprocity calibration between RRU.
For technical solutions according to the invention are described, below by specific embodiment, describe.
Embodiment mono-
Be illustrated in figure 1 RRU that the embodiment of the present invention provides by the structure chart of reciprocity calibration system, comprise: RRU is connected calibration access port by RF cable with calibrated channel interconnection device, main RRU sends to main RRU by RF cable by the first calibration reference signal and from RRU, main RRU and calculate up channel according to described the first calibration reference signal from RRU; Main RRU and by RF cable, the second calibration reference signal is sent to main RRU from RRU, main RRU calculates down channel according to described the second calibration reference signal, according to described up channel result of calculation and described down channel result of calculation, obtain the reciprocity calibration result between RRU, while making to send reciprocity calibrating signal between RRU, avoided because the impact of the signal of eating dishes without rice or wine in transmission on reciprocity calibrating signal improved the accuracy of reciprocity calibration between RRU.
Embodiment bis-
The flow chart that is illustrated in figure 2 reciprocity calibration steps between the RRU that the embodiment of the present invention provides, said method comprising the steps of:
In step S201, main RRU and receive the first calibration reference signal that main RRU sends by calibrating signal sendaisle from the calibrating signal receive path of RRU, and calculating up channel according to described the first calibration reference signal, described the first calibration reference signal transmits by described RF cable.
In embodiments of the present invention, at main RRU with after RRU interconnection, main RRU sends the first calibration reference signal (being up channel calibration reference signal) by calibrating signal sendaisle, main RRU and receive described the first calibration reference signal from the calibrating signal receive path of RRU, and calculate up channel, the special delivery in RF cable in transmittance process of described the first calibration reference signal according to described the first calibration reference signal.Described main RRU and receive the step of the first calibration reference signal that main RRU sends by calibrating signal sendaisle from the calibrating signal receive path of RRU, comprising:
1, main RRU sends the first calibration reference signal by calibrating signal sendaisle to described calibrated channel interconnection device.
In embodiments of the present invention, the first calibration reference signal that main RRU sends, first sends to calibrated channel interconnection device via RF cable.
2, described calibrated channel interconnection device is divided into multichannel the first calibration reference signal by power splitter by described the first calibration reference signal, and described multichannel the first calibration reference signal is sent to respectively to described main RRU and from RRU.
In embodiments of the present invention, calibrated channel interconnection device is divided into multichannel the first calibration reference signal by power splitter by described the first calibration reference signal, the RF cable of wherein leading up to turns back to main RRU, turn back to the calibrating signal receive path of main RRU, other the first calibration reference signal sends to the calibrating signal receive path from RRU by RF cable.
3, main RRU and receive described multichannel the first calibration reference signal from the calibrating signal receive path of RRU.
In embodiments of the present invention, main RRU and from RRU after receiving the first calibration reference signal, according to described the first calibration reference signal, calculate up channel, its computational process is used prior art, therefore not to repeat here.
In step S202, the second calibration reference signal that the calibrating signal receive path of main RRU receives main RRU and sends by calibrating signal sendaisle from RRU, and calculate down channel according to described the second calibration reference signal, to calculate reciprocity calibration result between RRU according to described up channel result of calculation and described down channel result of calculation, described the second calibration reference signal transmits by described RF cable.
In embodiments of the present invention, at main RRU with after RRU interconnection, main RRU and send the second calibration reference signal (being down channel calibration reference signal) by calibrating signal sendaisle from RRU, the calibrating signal receive path of main RRU receives described the second calibration reference signal, and calculate down channel, the special delivery in RF cable in transmittance process of described the second calibration reference signal according to described the second calibration reference signal.In addition, the reciprocity calibration result between RRU, after getting up channel result of calculation and down channel result of calculation, is calculated according to described result in base station, and the method for the reciprocity calibration result between described calculating RRU is used prior art, and therefore not to repeat here.Wherein, the calibrating signal receive path of described main RRU receives main RRU and the step of the second calibration reference signal of sending by calibrating signal sendaisle from RRU, comprising:
1, main RRU and send the second calibration reference signal by calibrating signal sendaisle to described calibrated channel interconnection device from RRU.
In embodiments of the present invention, main RRU and the second calibration reference signal sending from RRU, first send to calibrated channel interconnection device via RF cable.
2, described calibrated channel interconnection device synthesizes road second calibration reference signal by power splitter by the second calibration reference signal described in multichannel, and described road second calibration reference signal is sent to respectively to described main RRU.
In embodiments of the present invention, calibrated channel interconnection device synthesizes road second calibration reference signal by power splitter by described multichannel the second calibration reference signal, and described road second calibration reference signal is turned back to main RRU by RF cable, turn back to the calibrating signal receive path of main RRU.
3, the calibrating signal receive path of main RRU receives described road second calibration reference signal.
In embodiments of the present invention, main RRU, after receiving the second calibration reference signal, calculates down channel according to described the second calibration reference signal, and its computational process is used prior art, and therefore not to repeat here.
In step S203, described main RRU and describedly carry out between RRU reciprocity calibration from RRU according to reciprocity calibration result between described RRU.
The embodiment of the present invention, RRU is connected calibration access port by RF cable with calibrated channel interconnection device, main RRU sends to main RRU by RF cable by the first calibration reference signal and from RRU, main RRU and calculate up channel according to described the first calibration reference signal from RRU; Main RRU and by RF cable, the second calibration reference signal is sent to main RRU from RRU, main RRU calculates down channel according to described the second calibration reference signal, according to described up channel result of calculation and described down channel result of calculation, obtain the reciprocity calibration result between RRU, while making to send reciprocity calibrating signal between RRU, avoided because the impact of the signal of eating dishes without rice or wine in transmission on reciprocity calibrating signal improved the accuracy of reciprocity calibration between RRU.
As an optional embodiment of the present invention, at described main RRU with from the calibrating signal receive path of RRU, receive the first calibration reference signal that main RRU sends by calibrating signal sendaisle, and before calculating the step of up channel according to described the first calibration reference signal, described method also comprises:
Main RRU with from RRU, by RF cable, calibration access port is connected with calibrated channel interconnection device respectively, described calibrated channel port is positioned at RRU side, and be connected with calibrating signal sendaisle with calibrating signal receive path, described calibrated channel port is connected with calibrated channel.
In embodiments of the present invention, calibrated channel is the passage that Remote Radio Unit (Radio Remote Unit is called for short RRU) sends calibration reference signal and reception calibration reference signal, conventionally in RRU, comprise two calibrated channels, be calibrating signal receive path and calibrating signal sendaisle, calibrated channel is connected with calibrated channel port in RRU.A plurality of RRU in base station are connected calibration access port by RF cable with calibrated channel interconnection device, by RF cable, calibrated channel port, calibrated channel interconnection device, a plurality of RRU in base station can be interconnected like this, i.e. main RRU and coupling together from RRU.
As another alternative embodiment of the invention, at described main RRU, with before the step by RF cable, calibration access port being connected with calibrated channel interconnection device respectively from RRU, described method also comprises:
Main RRU is set, from RRU and standby main RRU, described standby main RRU is for using as main RRU during when machine at described main RRU, described standby main RRU when described main RRU moves as using from RRU.
In embodiments of the present invention, before interconnection, main RRU need to be set, from RRU and standby main RRU, its setting up procedure can arrange as required, at this, does not limit.It is pointed out that standby main RRU is for using as main RRU during when machine at described main RRU, described standby main RRU when described main RRU operation as using from RRU.
As another alternative embodiment of the invention, receive the step of the first calibration reference signal that main RRU sends by calibrating signal sendaisle at described main RRU with from the calibrating signal receive path of RRU before, described method also comprises:
When described calibrated channel port is two, at described main RRU, radio-frequency (RF) switch is installed, so that by described radio-frequency (RF) switch, described calibrating signal receive path and calibrating signal sendaisle are adjusted to different passages; Or,
When described calibrated channel port is two, at described calibrated channel interconnection device, radio-frequency (RF) switch is installed, so that by described radio-frequency (RF) switch, described calibrating signal receive path and calibrating signal sendaisle are adjusted to different passages.
In embodiments of the present invention, generally, calibrated channel port only has one, calibrating signal receive path is all connected with this calibrated channel port with calibrating signal sendaisle, therefore the transmission because the first calibration reference signal and the second calibration reference signal stagger, there will not be the situation of conflict.If but calibrated channel port is two, calibrating signal receive path and calibrating signal sendaisle are connected with one of them respectively, can it arrive better effect, therefore a radio-frequency (RF) switch can be installed in base station, described calibrating signal receive path and calibrating signal sendaisle are adjusted to different passages.
As another alternative embodiment of the invention,
Described main RRU and from calibrating signal sendaisle and the calibrating signal receive path of RRU, the sendaisle of antenna and receive path in multiplexing RRU.
In embodiments of the present invention, in above-described embodiment, all two passages to be installed in RRU as the designated lane of calibrating signal receive path and calibrating signal sendaisle, and the ready-made existing receive path of antenna and sendaisle in RRU, therefore receive path and sendaisle that can multiplex antenna, it is to be noted:
The sendaisle of multiplexing same antenna and receive path; Or,
The receive path of the sendaisle of multiplexing the first antenna and the second antenna.
Embodiment tri-
The structure chart that is illustrated in figure 3 reciprocity calibration system between the RRU that the embodiment of the present invention provides, for convenience of explanation, only illustrates the part relevant to the embodiment of the present invention, and described system comprises main RRU1 and from RRU2, wherein:
Main RRU1 is for receiving by calibrating signal receive path the first calibration reference signal that described main RRU1 sends by calibrating signal sendaisle, according to described the first calibration reference signal, calculate up channel, the second calibration reference signal that receives described main RRU1 and send from RRU2, according to described the second calibration reference signal, calculate down channel, to calculate reciprocity calibration result between RRU according to described up channel result of calculation and described down channel result of calculation, and carry out reciprocity calibration between RRU according to reciprocity calibration result between described RRU, described the first calibration reference signal and described the second calibration reference signal transmit by RF cable.
The first calibration reference signal from RRU2 for sending by calibrating signal sendaisle by the described main RRU1 of calibrating signal receiving element reception, by calibrating signal sendaisle, to described main RRU1, send the second calibration reference signal, so that described main RRU1 calculates up channel and calculates down channel according to described the second reference signal according to described the first calibration reference signal, and then calculate reciprocity calibration result between RRU according to described up channel result of calculation and described down channel result of calculation, and carry out reciprocity calibration between RRU according to reciprocity calibration result between described RRU.
In embodiments of the present invention, at main RRU1 with after RRU2 interconnection, main RRU1 sends the first calibration reference signal (being up channel calibration reference signal) by calibrating signal sendaisle, main RRU1 and receive described the first calibration reference signal from the calibrating signal receive path of RRU2, and calculate up channel, the special delivery in RF cable in transmittance process of described the first calibration reference signal according to described the first calibration reference signal.
At main RRU1 with after RRU2 interconnection, main RRU1 and send the second calibration reference signal (being down channel calibration reference signal) by calibrating signal sendaisle from RRU2, the calibrating signal receive path of main RRU1 receives described the second calibration reference signal, and calculate down channel, the special delivery in RF cable in transmittance process of described the second calibration reference signal according to described the second calibration reference signal.In addition, the reciprocity calibration result between RRU, after getting up channel result of calculation and down channel result of calculation, is calculated according to described result in base station, and the method for the reciprocity calibration result between described calculating RRU is used prior art, and therefore not to repeat here.
Wherein, described main RRU1 with from RRU2, by RF cable, calibration access port is connected with calibrated channel interconnection device respectively, described calibrated channel port is arranged at RRU side, and is connected with calibrating signal sendaisle with the calibrating signal receive path of described RRU.
In embodiments of the present invention, calibrated channel is the passage that Remote Radio Unit (Radio Remote Unit is called for short RRU) sends calibration reference signal and reception calibration reference signal, conventionally in RRU, comprise two calibrated channels, be calibrating signal receive path and calibrating signal sendaisle, calibrated channel is connected with calibrated channel port in RRU.A plurality of RRU in base station are connected calibration access port by RF cable with calibrated channel interconnection device, by RF cable, calibrated channel port, calibrated channel interconnection device, a plurality of RRU in base station can be interconnected like this, i.e. main RRU and coupling together from RRU.
Wherein, described main RRU1, for receiving by calibrating signal receive path the first calibration reference signal that described main RRU1 sends by calibrating signal sendaisle, comprising:
Main RRU1 sends the first calibration reference signal by calibrating signal sendaisle to described calibrated channel interconnection device;
Described calibrated channel interconnection device is divided into multichannel the first calibration reference signal by power splitter by described the first calibration reference signal, and described multichannel the first calibration reference signal is sent to respectively to described main RRU1 and described from RRU2;
Described main RRU1 and described calibrating signal receive path from RRU2 receive respectively described multichannel the first calibration reference signal.
Wherein, the described main RRU1 of described reception and the second calibration reference signal sending from RRU2, comprising:
Main RRU1 and send the second calibration reference signal by calibrating signal sendaisle to described calibrated channel interconnection device from RRU2;
Described calibrated channel interconnection device synthesizes road second calibration reference signal by power splitter by the second calibration reference signal described in multichannel, and described road second calibration reference signal is sent to respectively to described main RRU1;
The calibrating signal receive path of described main RRU1 receives described road second calibration reference signal.
The embodiment of the present invention, RRU is connected calibration access port by RF cable with calibrated channel interconnection device, main RRU1 sends to main RRU1 by RF cable by the first calibration reference signal and from RRU2, main RRU1 and calculate up channel according to described the first calibration reference signal from RRU2; Main RRU1 and by RF cable, the second calibration reference signal is sent to main RRU1 from RRU2, main RRU1 calculates down channel according to described the second calibration reference signal, according to described up channel result of calculation and described down channel result of calculation, obtain the reciprocity calibration result between RRU, while making to send reciprocity calibrating signal between RRU, avoided because the impact of the signal of eating dishes without rice or wine in transmission on reciprocity calibrating signal improved the accuracy of reciprocity calibration between RRU.
As an optional embodiment of the present invention, described system also comprises setting unit, wherein:
Described setting unit is used for arranging main RRU, from RRU and standby main RRU, described standby main RRU is for using as main RRU during when machine at described main RRU, described standby main RRU when described main RRU moves as using from RRU.
As another alternative embodiment of the invention, described system also comprises setting unit, wherein:
Described setting unit is used for:
When described calibrated channel port is two, at described main RRU, radio-frequency (RF) switch is set, so that by described radio-frequency (RF) switch, described calibrating signal receive path and calibrating signal sendaisle are adjusted to different passages; Or,
When described calibrated channel port is two, at described calibrated channel interconnection device, radio-frequency (RF) switch is set, so that by described radio-frequency (RF) switch, described calibrating signal receive path and calibrating signal sendaisle are adjusted to different passages.
As another alternative embodiment of the invention, described main RRU and from calibrating signal sendaisle and the calibrating signal receive path of RRU, the sendaisle of antenna and receive path in multiplexing RRU.
In embodiments of the present invention, in above-described embodiment, all two passages to be installed in RRU as the designated lane of calibrating signal receive path and calibrating signal sendaisle, and the ready-made existing receive path of antenna and sendaisle in RRU, therefore receive path and sendaisle that can multiplex antenna, it is to be noted:
The sendaisle of multiplexing same antenna and receive path; Or,
The receive path of the sendaisle of multiplexing the first antenna and the second antenna.
One of ordinary skill in the art will appreciate that and just according to function logic, divide for above-described embodiment included unit, but be not limited to above-mentioned division, as long as can realize corresponding function; In addition, the concrete title of each functional unit also, just for the ease of mutual differentiation, is not limited to protection scope of the present invention.

Claims (16)

1. a method for reciprocity calibration between RRU, is characterized in that, described method comprises:
Receive the first calibration reference signal that main RRU sends by calibrating signal sendaisle, and calculate up channel according to described the first calibration reference signal;
The second calibration reference signal that the calibrating signal receive path of main RRU receives main RRU and sends by calibrating signal sendaisle from RRU, and calculate down channel according to described the second calibration reference signal, 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 describedly carry out between RRU reciprocity calibration from RRU according to reciprocity calibration result between described RRU.
2. the method for claim 1, is characterized in that, before the step of the first calibration reference signal sending by calibrating signal sendaisle at the main RRU of described reception, described method also comprises:
Main RRU with from RRU, by RF cable, calibration access port is connected with calibrated channel interconnection device respectively, described calibrated channel port is arranged at RRU side, and is connected with calibrating signal sendaisle with the calibrating signal receive path of described RRU.
3. the method for claim 1, is characterized in that, the step of the first calibration reference signal that the main RRU of described reception sends by calibrating signal sendaisle, comprising:
Main RRU sends the first calibration reference signal by calibrating signal sendaisle to described calibrated channel interconnection device;
Described calibrated channel interconnection device is divided into multichannel the first calibration reference signal by power splitter by described the first calibration reference signal, and described multichannel the first calibration reference signal is sent to respectively to described main RRU and described from RRU;
Described main RRU and described calibrating signal receive path from RRU receive respectively described multichannel the first calibration reference signal.
4. the method for claim 1, is characterized in that, the calibrating signal receive path of described main RRU receives main RRU and the step of the second calibration reference signal of sending by calibrating signal sendaisle from RRU, comprising:
Main RRU and send the second calibration reference signal by calibrating signal sendaisle to described calibrated channel interconnection device from RRU;
Described calibrated channel interconnection device synthesizes road second calibration reference signal by power splitter by the second calibration reference signal described in multichannel, and described road second calibration reference signal is sent to respectively to described main RRU;
The calibrating signal receive path of described main RRU receives described road second calibration reference signal.
5. the method as described in claim 1~4, is characterized in that, receive the step of the first calibration reference signal that main RRU sends by calibrating signal sendaisle at described main RRU with from the calibrating signal receive path of RRU before, described method also comprises:
Main RRU is set, from RRU and standby main RRU, described standby main RRU is for using as main RRU during when machine at described main RRU, described standby main RRU when described main RRU moves as using from RRU.
6. the method as described in claim 1~4 any one, is characterized in that, receive the step of the first calibration reference signal that main RRU sends by calibrating signal sendaisle at described main RRU with from the calibrating signal receive path of RRU before, described method also comprises:
When described calibrated channel port is two, at described main RRU, radio-frequency (RF) switch is set, so that by described radio-frequency (RF) switch, described calibrating signal receive path and calibrating signal sendaisle are adjusted to different passages; Or,
When described calibrated channel port is two, at described calibrated channel interconnection device, radio-frequency (RF) switch is set, so that by described radio-frequency (RF) switch, described calibrating signal receive path and calibrating signal sendaisle are adjusted to different passages.
7. the method as described in claim 1~4 any one, is characterized in that, described main RRU and from calibrating signal sendaisle and the calibrating signal receive path of RRU, the sendaisle of antenna and receive path in multiplexing RRU.
8. method as claimed in claim 7, is characterized in that, sendaisle and the receive path of antenna in described multiplexing RRU, comprising:
The sendaisle of multiplexing same antenna and receive path; Or,
The receive path of the sendaisle of multiplexing the first antenna and the second antenna.
9. a system for reciprocity calibration between RRU, is characterized in that, described system comprises main radio frequency remote unit RRU and from RRU, wherein:
Main RRU is for receiving the first calibration reference signal that described main RRU sends by calibrating signal sendaisle, according to described the first calibration reference signal, calculate up channel, the second calibration reference signal that receives described main RRU and send from RRU, according to described the second calibration reference signal, calculate down channel, to calculate reciprocity calibration result between RRU according to described up channel result of calculation and described down channel result of calculation, and carry out reciprocity calibration between RRU according to reciprocity calibration result between described RRU;
From RRU, be used for receiving the first calibration reference signal that described main RRU sends by calibrating signal sendaisle, by calibrating signal sendaisle, to described main RRU, send the second calibration reference signal, so that described main RRU calculates up channel and calculates down channel according to described the second reference signal according to described the first calibration reference signal, and then calculate reciprocity calibration result between RRU according to described up channel result of calculation and described down channel result of calculation, and carry out reciprocity calibration between RRU according to reciprocity calibration result between described RRU.
10. system as claimed in claim 9, is characterized in that, described main RRU and from RRU also for:
Main RRU with from RRU, by RF cable, calibration access port is connected with calibrated channel interconnection device respectively, described calibrated channel port is arranged at RRU side, and is connected with calibrating signal sendaisle with the calibrating signal receive path of described RRU.
11. systems as claimed in claim 9, is characterized in that, described main RRU, for receiving the first calibration reference signal that described main RRU sends by calibrating signal sendaisle, comprising:
Main RRU sends the first calibration reference signal by calibrating signal sendaisle to described calibrated channel interconnection device;
Described calibrated channel interconnection device is divided into multichannel the first calibration reference signal by power splitter by described the first calibration reference signal, and described multichannel the first calibration reference signal is sent to respectively to described main RRU and described from RRU;
Described main RRU and described calibrating signal receive path from RRU receive respectively described multichannel the first calibration reference signal.
12. systems as claimed in claim 9, is characterized in that, the described main RRU of described reception and the second calibration reference signal sending from RRU, comprising:
Main RRU and send the second calibration reference signal by calibrating signal sendaisle to described calibrated channel interconnection device from RRU;
Described calibrated channel interconnection device synthesizes road second calibration reference signal by power splitter by the second calibration reference signal described in multichannel, and described road second calibration reference signal is sent to respectively to described main RRU;
The calibrating signal receive path of described main RRU receives described road second calibration reference signal.
13. systems as described in claim 9~12 any one, is characterized in that, described system also comprises setting unit, wherein:
Described setting unit is used for arranging main RRU, from RRU and standby main RRU, described standby main RRU is for using as main RRU during when machine at described main RRU, described standby main RRU when described main RRU moves as using from RRU.
14. systems as described in claim 9~12 any one, is characterized in that, described system also comprises setting unit, wherein:
Described setting unit is used for:
When described calibrated channel port is two, at described main RRU, radio-frequency (RF) switch is set, so that by described radio-frequency (RF) switch, described calibrating signal receive path and calibrating signal sendaisle are adjusted to different passages; Or,
When described calibrated channel port is two, at described calibrated channel interconnection device, radio-frequency (RF) switch is set, so that by described radio-frequency (RF) switch, described calibrating signal receive path and calibrating signal sendaisle are adjusted to different passages.
15. systems as described in claim 9~12 any one, is characterized in that, described main RRU and from calibrating signal sendaisle and the calibrating signal receive path of RRU, the sendaisle of antenna and receive path in multiplexing RRU.
16. systems as claimed in claim 15, is characterized in that, sendaisle and the receive path of antenna in described multiplexing RRU, comprising:
The sendaisle of multiplexing same antenna and receive path; Or,
The receive path of the sendaisle of multiplexing the first antenna and the second antenna.
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