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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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 field of communication, and particularly relates to a method and a system for calibrating reciprocity between RRUs.
Background
Channel reciprocity is considered a great advantage of LTE time division duplex systems over frequency division duplex systems. The uplink and downlink channels use the same frequency band, so that the downlink channel can be estimated according to the uplink channel, thereby improving the downlink transmission performance. However, in practical systems, each antenna of the base station and the user terminal has a separate receiving and transmitting link, and the channel reciprocity is only applicable to spatial propagation channels, and there is no absolute channel reciprocity. Slight uplink and downlink channel reciprocity errors can cause significant changes in system performance. Therefore, the reciprocity of the base station antennas must be calibrated before the time division duplex channel reciprocity is used.
In the prior art, a technology for calibrating reciprocity between antennas in the same base station or Radio Remote Unit (Radio Remote Unit, RRU for short) is very comprehensive, but when a signal of a base station or an RRU edge user is improved through multi-point cooperation, calibration of reciprocity between base stations or RRUs needs to be used.
In the prior art, reciprocity calibration between base stations or RRUs is performed by using a wireless signal, but the calibration signal is affected by a plurality of factors such as a channel estimation error caused by air wireless channel multipath fading, a quantization error introduced by air interface feedback, a channel interpolation error caused by synchronization deviation, and the like.
Disclosure of Invention
Embodiments of the present invention provide a method and a system for calibrating reciprocity between RRUs, so as to alleviate the problem that signals transmitted over an air interface in the prior art interfere with calibration signals of reciprocity between RRUs.
In a first aspect, an embodiment of the present invention provides a method for calibrating reciprocity between RRUs, where the method includes:
a receiving channel receives a first calibration reference signal sent by a main RRU through a calibration signal sending channel, and calculates an uplink channel according to the first calibration reference signal;
a calibration signal receiving channel of the main RRU receives a second calibration reference signal sent by the main RRU and the slave RRU through a calibration signal sending channel, and calculates a downlink channel according to the second calibration reference signal so as to calculate a reciprocity calibration result between the RRUs according to the calculation result of the uplink channel and the calculation result of the downlink channel;
and the master RRU and the slave RRU carry out the calibration of the reciprocity between the RRUs according to the calibration result of the reciprocity between the RRUs.
In a first possible implementation manner of the first aspect, before the step of receiving, by the receive channel, a first calibration reference signal sent by a main RRU through a calibration signal sending channel, the method further includes:
the main RRU and the auxiliary RRU are respectively connected with a calibration channel port and a calibration channel interconnection device through radio frequency cables, and the calibration channel port is arranged on the side of the RRU and is connected with a calibration signal receiving channel and a calibration signal sending channel of the RRU.
In a second possible implementation manner of the first aspect, the step of receiving a first calibration reference signal sent by the main RRU through a calibration signal sending channel includes:
the main RRU sends a first calibration reference signal to the calibration channel interconnection device through a calibration signal sending channel;
the calibration channel interconnection device divides the first calibration reference signal into multiple first calibration reference signals through a power divider, and sends the multiple first calibration reference signals to the master RRU and the slave RRU respectively;
and the calibration signal receiving channels of the main RRU and the slave RRU respectively receive the plurality of first calibration reference signals.
In a third possible implementation manner of the first aspect, the step of receiving, by the calibration signal receiving channel of the main RRU, the main RRU and the second calibration reference signal sent by the slave RRU through the calibration signal sending channel includes:
the main RRU and the auxiliary RRU send a second calibration reference signal to the calibration channel interconnection device through a calibration signal sending channel;
the calibration channel interconnection device synthesizes multiple paths of the second calibration reference signals into one path of second calibration reference signal through a power divider, and sends the one path of second calibration reference signal to the main RRU respectively;
and the calibration signal receiving channel of the main RRU receives the second calibration reference signal.
With reference to the first aspect, the first possible implementation manner of the first aspect, the second possible implementation manner of the first aspect, and the third possible implementation manner of the first aspect, in a fourth possible implementation manner, before the step of receiving, by the master RRU and the calibration signal receiving channel of the slave RRU, the first calibration reference signal sent by the master RRU through the calibration signal sending channel, the method further includes:
the method comprises the steps that a main RRU, a slave RRU and a standby main RRU are arranged, the standby main RRU is used as the main RRU when the main RRU is shut down, and the standby main RRU is used as the slave RRU when the main RRU runs.
With reference to the first aspect, the first possible implementation manner of the first aspect, the second possible implementation manner of the first aspect, and the third possible implementation manner of the first aspect, in a fifth possible implementation manner, before the step of receiving, by the master RRU and the calibration signal receiving channel of the slave RRU, the first calibration reference signal sent by the master RRU through the calibration signal sending channel, the method further includes:
when the number of the calibration channel ports is two, a radio frequency switch is arranged on the main RRU, so that the calibration signal receiving channel and the calibration signal sending channel are adjusted to different channels through the radio frequency switch; or,
when the number of the calibration channel ports is two, a radio frequency switch is arranged on the calibration channel interconnection device, so that the calibration signal receiving channel and the calibration signal sending channel are adjusted to different channels through the radio frequency switch.
With reference to the first aspect, the first possible implementation manner of the first aspect, the second possible implementation manner of the first aspect, and the third possible implementation manner of the first aspect, in a sixth possible implementation manner, the calibration signal sending channel and the calibration signal receiving channel of the master RRU and the slave RRU multiplex the sending channel and the receiving channel of the antenna in the RRU.
With reference to the sixth possible implementation manner of the first aspect, in a seventh possible implementation manner, the multiplexing a transmit channel and a receive channel of an antenna in an RRU includes:
multiplexing a transmitting channel and a receiving channel of the same antenna; or,
the transmit path of the first antenna and the receive path of the second antenna are multiplexed.
In a second aspect, an embodiment of the present invention provides a system for calibrating reciprocity between RRUs, where the system includes a master remote radio unit RRU and a slave RRU, where:
the main RRU is used for receiving a first calibration reference signal sent by the main RRU through a calibration signal sending channel, calculating an uplink channel according to the first calibration reference signal, receiving a second calibration reference signal sent by the main RRU and a slave RRU, calculating a downlink channel according to the second calibration reference signal so as to calculate a reciprocity calibration result between the RRUs according to the uplink channel calculation result and the downlink channel calculation result, and calibrating the reciprocity between the RRUs according to the reciprocity calibration result between the RRUs;
the slave RRU is used for receiving a first calibration reference signal sent by the main RRU through a calibration signal sending channel, and sending a second calibration reference signal to the main RRU through the calibration signal sending channel, so that the main RRU calculates an uplink channel according to the first calibration reference signal and a downlink channel according to the second reference signal, further calculates a reciprocity calibration result between RRUs according to the uplink channel calculation result and the downlink channel calculation result, and calibrates the reciprocity between RRUs according to the reciprocity calibration result between RRUs.
In a first possible implementation manner of the second aspect, the master RRU and the slave RRU are further configured to:
the main RRU and the auxiliary RRU are respectively connected with a calibration channel port and a calibration channel interconnection device through radio frequency cables, and the calibration channel port is arranged on the side of the RRU and is connected with a calibration signal receiving channel and a calibration signal sending channel of the RRU.
In a second possible implementation manner of the second aspect, the method for receiving, by the main RRU, a first calibration reference signal sent by the main RRU through a calibration signal sending channel includes:
the main RRU sends a first calibration reference signal to the calibration channel interconnection device through a calibration signal sending channel;
the calibration channel interconnection device divides the first calibration reference signal into multiple first calibration reference signals through a power divider, and sends the multiple first calibration reference signals to the master RRU and the slave RRU respectively;
and the calibration signal receiving channels of the main RRU and the slave RRU respectively receive the plurality of first calibration reference signals.
In a third possible implementation manner of the second aspect, the receiving the second calibration reference signals sent by the master RRU and the slave RRU includes:
the main RRU and the auxiliary RRU send a second calibration reference signal to the calibration channel interconnection device through a calibration signal sending channel;
the calibration channel interconnection device synthesizes multiple paths of the second calibration reference signals into one path of second calibration reference signal through a power divider, and sends the one path of second calibration reference signal to the main RRU respectively;
and the calibration signal receiving channel of the main RRU receives the second calibration reference signal.
With reference to the second aspect, the first possible implementation manner of the second aspect, the second possible implementation manner of the second aspect, and the third possible implementation manner of the second aspect, in a fourth possible implementation manner, the system further includes a setting unit, where:
the setting unit is used for setting a main RRU, a slave RRU and a standby main RRU, wherein the standby main RRU is used as the main RRU when the main RRU is shut down, and the standby main RRU is used as the slave RRU when the main RRU runs.
With reference to the second aspect, the first possible implementation manner of the second aspect, the second possible implementation manner of the second aspect, and the third possible implementation manner of the second aspect, in a fifth possible implementation manner, the system further includes a setting unit, wherein:
the setting unit is used for:
when the number of the calibration channel ports is two, a radio frequency switch is arranged on the main RRU, so that the calibration signal receiving channel and the calibration signal sending channel are adjusted to different channels through the radio frequency switch; or,
when the number of the calibration channel ports is two, a radio frequency switch is arranged on the calibration channel interconnection device, so that the calibration signal receiving channel and the calibration signal sending channel are adjusted to different channels through the radio frequency switch.
With reference to the second aspect, the first possible implementation manner of the second aspect, the second possible implementation manner of the second aspect, and the third possible implementation manner of the second aspect, in a sixth possible implementation manner, the calibration signal sending channels and the calibration signal receiving channels of the master RRU and the slave RRU multiplex the sending channels and the receiving channels of the antennas in the RRUs.
With reference to the sixth possible implementation manner of the second aspect, in a seventh possible implementation manner, the multiplexing a transmit channel and a receive channel of an antenna in an RRU includes:
multiplexing a transmitting channel and a receiving channel of the same antenna; or,
the transmit path of the first antenna and the receive path of the second antenna are multiplexed.
In the embodiment of the invention, the RRU connects the calibration channel port with the calibration channel interconnection device through the radio frequency cable, the main RRU sends a first calibration reference signal to the main RRU and the auxiliary RRU through the radio frequency cable, and the main RRU and the auxiliary RRU calculate an uplink channel according to the first calibration reference signal; the main RRU and the auxiliary RRU send a second calibration reference signal to the main RRU through radio frequency cables, the main RRU calculates a downlink channel according to the second calibration reference signal, and obtains a reciprocity calibration result between the RRUs according to the uplink channel calculation result and the downlink channel calculation result, so that when the reciprocity calibration signal is sent between the RRUs, the influence of signals in air interface transmission on the reciprocity calibration signal is avoided, and the accuracy of reciprocity calibration between the RRUs is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic diagram of a system for calibrating reciprocity between RRUs according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for calibrating reciprocity between RRUs according to an embodiment of the present invention;
fig. 3 is a structural diagram of a reciprocity calibration system between RRUs according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the embodiment of the invention, the RRU connects the calibration channel port with the calibration channel interconnection device through the radio frequency cable, the main RRU sends a first calibration reference signal to the main RRU and the auxiliary RRU through the radio frequency cable, and the main RRU and the auxiliary RRU calculate an uplink channel according to the first calibration reference signal; the main RRU and the auxiliary RRU send a second calibration reference signal to the main RRU through radio frequency cables, the main RRU calculates a downlink channel according to the second calibration reference signal, and obtains a reciprocity calibration result between the RRUs according to the uplink channel calculation result and the downlink channel calculation result, so that when the reciprocity calibration signal is sent between the RRUs, the influence of signals in air interface transmission on the reciprocity calibration signal is avoided, and the accuracy of reciprocity calibration between the RRUs is improved.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Example one
Fig. 1 is a structural diagram of a system for calibrating reciprocity of an RRU according to an embodiment of the present invention, where the system includes: the RRU connects the calibration channel port with the calibration channel interconnection device through a radio frequency cable, the main RRU sends a first calibration reference signal to the main RRU and the auxiliary RRU through the radio frequency cable, and the main RRU and the auxiliary RRU calculate an uplink channel according to the first calibration reference signal; the main RRU and the auxiliary RRU send a second calibration reference signal to the main RRU through radio frequency cables, the main RRU calculates a downlink channel according to the second calibration reference signal, and obtains a reciprocity calibration result between the RRUs according to the uplink channel calculation result and the downlink channel calculation result, so that when the reciprocity calibration signal is sent between the RRUs, the influence of signals in air interface transmission on the reciprocity calibration signal is avoided, and the accuracy of reciprocity calibration between the RRUs is improved.
Example two
Fig. 2 is a flowchart of a method for calibrating reciprocity between RRUs according to an embodiment of the present invention, where the method includes the following steps:
in step S201, the calibration signal receiving channels of the master RRU and the slave RRUs receive a first calibration reference signal sent by the master RRU through the calibration signal sending channel, and calculate an uplink channel according to the first calibration reference signal, where the first calibration reference signal is transmitted through the radio frequency cable.
In the embodiment of the present invention, after the master RRU and the slave RRU are interconnected, the master RRU sends a first calibration reference signal (i.e., an uplink channel calibration reference signal) through a calibration signal sending channel, the calibration signal receiving channels of the master RRU and the slave RRU receive the first calibration reference signal, and an uplink channel is calculated according to the first calibration reference signal, where the first calibration reference signal is specifically delivered in a radio frequency cable in a delivery process. The step of receiving, by the calibration signal receiving channels of the main RRU and the slave RRU, the first calibration reference signal sent by the main RRU through the calibration signal sending channel includes:
1. and the main RRU sends a first calibration reference signal to the calibration channel interconnection device through a calibration signal sending channel.
In the embodiment of the present invention, the first calibration reference signal sent by the main RRU is first sent to the calibration channel interconnection apparatus via the radio frequency cable.
2. The calibration channel interconnection device divides the first calibration reference signal into multiple first calibration reference signals through a power divider, and sends the multiple first calibration reference signals to the master RRU and the slave RRU respectively.
In the embodiment of the present invention, the calibration channel interconnection apparatus divides the first calibration reference signal into multiple first calibration reference signals through a power divider, wherein one of the first calibration reference signals returns to the master RRU through a radio frequency cable, that is, returns to the calibration signal receiving channel of the master RRU, and the other first calibration reference signals are sent to the calibration signal receiving channel of the slave RRU through a radio frequency cable.
3. And the calibration signal receiving channels of the main RRU and the slave RRUs receive the plurality of first calibration reference signals.
In the embodiment of the present invention, after receiving the first calibration reference signal, the master RRU and the slave RRU calculate the uplink channel according to the first calibration reference signal, and the calculation process uses the prior art, which is not described herein again.
In step S202, the calibration signal receiving channel of the master RRU receives a second calibration reference signal sent by the master RRU and the slave RRU through the calibration signal sending channel, and calculates a downlink channel according to the second calibration reference signal, so as to calculate a reciprocity calibration result between the RRUs according to the uplink channel calculation result and the downlink channel calculation result, and the second calibration reference signal is transmitted through the radio frequency cable.
In the embodiment of the present invention, after the master RRU and the slave RRU are interconnected, the master RRU and the slave RRU transmit a second calibration reference signal (i.e., a downlink channel calibration reference signal) through the calibration signal transmission channel, and the calibration signal reception channel of the master RRU receives the second calibration reference signal and calculates a downlink channel according to the second calibration reference signal, where the second calibration reference signal is delivered exclusively through the radio frequency cable in a delivery process. In addition, after obtaining the uplink channel calculation result and the downlink channel calculation result, the base station calculates the reciprocity calibration result between the RRUs according to the results, and the method for calculating the reciprocity calibration result between the RRUs uses the prior art, which is not described herein again. Wherein, the step of receiving, by the calibration signal receiving channel of the main RRU, the second calibration reference signal sent by the main RRU and the slave RRU through the calibration signal sending channel includes:
1. and the master RRU and the slave RRU send a second calibration reference signal to the calibration channel interconnection device through a calibration signal sending channel.
In the embodiment of the present invention, the second calibration reference signal sent by the master RRU and the slave RRU is first sent to the calibration channel interconnection apparatus via the radio frequency cable.
2. The calibration channel interconnection device synthesizes multiple paths of the second calibration reference signals into one path of second calibration reference signal through a power divider, and sends the one path of second calibration reference signal to the main RRU respectively.
In the embodiment of the present invention, the calibration channel interconnection apparatus synthesizes the multiple paths of second calibration reference signals into one path of second calibration reference signal through the power splitter, and returns the one path of second calibration reference signal to the main RRU through the radio frequency cable, that is, returns to the calibration signal receiving channel of the main RRU.
3. And a calibration signal receiving channel of the main RRU receives the second calibration reference signal.
In the embodiment of the present invention, after receiving the second calibration reference signal, the main RRU calculates the downlink channel according to the second calibration reference signal, and the calculation process uses the prior art and is not described herein again.
In step S203, the master RRU and the slave RRU perform inter-RRU reciprocity calibration according to the inter-RRU reciprocity calibration result.
In the embodiment of the invention, the RRU connects the calibration channel port with the calibration channel interconnection device through the radio frequency cable, the main RRU sends a first calibration reference signal to the main RRU and the auxiliary RRU through the radio frequency cable, and the main RRU and the auxiliary RRU calculate an uplink channel according to the first calibration reference signal; the main RRU and the auxiliary RRU send a second calibration reference signal to the main RRU through radio frequency cables, the main RRU calculates a downlink channel according to the second calibration reference signal, and obtains a reciprocity calibration result between the RRUs according to the uplink channel calculation result and the downlink channel calculation result, so that when the reciprocity calibration signal is sent between the RRUs, the influence of signals in air interface transmission on the reciprocity calibration signal is avoided, and the accuracy of reciprocity calibration between the RRUs is improved.
As an optional embodiment of the present invention, before the steps of receiving, by calibration signal receiving channels of the main RRU and the slave RRU, a first calibration reference signal sent by the main RRU through a calibration signal sending channel, and calculating an uplink channel according to the first calibration reference signal, the method further includes:
the calibration channel port is located on the RRU side and connected with the calibration signal receiving channel and the calibration signal sending channel, and the calibration channel port is connected with the calibration channel.
In the embodiment of the present invention, the calibration channel is a channel through which a Radio Remote Unit (Radio Remote Unit, RRU for short) transmits and receives a calibration reference signal, and usually, the RRU includes two calibration channels, that is, a calibration signal receiving channel and a calibration signal transmitting channel, and the calibration channel is connected to a calibration channel port in the RRU. The calibration channel ports and the calibration channel interconnection device are connected by a plurality of RRUs in the base station through radio frequency cables, so that the plurality of RRUs in the base station can be connected with each other through the radio frequency cables, the calibration channel ports and the calibration channel interconnection device, namely, the main RRU and the auxiliary RRUs are connected.
As another optional embodiment of the present invention, before the step of connecting the calibration channel port and the calibration channel interconnection apparatus by the master RRU and the slave RRU through radio frequency cables, respectively, the method further includes:
the method comprises the steps that a main RRU, a slave RRU and a standby main RRU are arranged, the standby main RRU is used as the main RRU when the main RRU is shut down, and the standby main RRU is used as the slave RRU when the main RRU runs.
In the embodiment of the present invention, before interconnection, a main RRU, a slave RRU, and a spare main RRU need to be set, and the setting process may be set as needed, which is not limited herein. It should be noted that the spare main RRU is used as a main RRU when the main RRU is powered off, and the spare main RRU is used as a slave RRU when the main RRU is powered on.
As another optional embodiment of the present invention, before the step of receiving, by the calibration signal receiving channels of the master RRU and the slave RRU, the first calibration reference signal sent by the master RRU through the calibration signal sending channel, the method further includes:
when the number of the calibration channel ports is two, installing a radio frequency switch on the main RRU, so that the calibration signal receiving channel and the calibration signal sending channel are adjusted to different channels through the radio frequency switch; or,
when the number of the calibration channel ports is two, a radio frequency switch is installed on the calibration channel interconnection device, so that the calibration signal receiving channel and the calibration signal transmitting channel are adjusted to different channels through the radio frequency switch.
In the embodiment of the present invention, in a normal case, there is only one calibration channel port, and both the calibration signal receiving channel and the calibration signal transmitting channel are connected to the calibration channel port, because the first calibration reference signal and the second calibration reference signal are transmitted in a staggered manner, a collision situation does not occur. However, if the number of the calibration channel ports is two, and the calibration signal receiving channel and the calibration signal transmitting channel are respectively connected to one of the two ports, the better effect can be achieved, so that a radio frequency switch can be installed in the base station to adjust the calibration signal receiving channel and the calibration signal transmitting channel to different channels.
As a further alternative embodiment of the present invention,
and the calibration signal sending channel and the calibration signal receiving channel of the main RRU and the slave RRU multiplex the sending channel and the receiving channel of the antenna in the RRU.
In the embodiment of the present invention, in the above embodiments, two channels are installed in the RRU as dedicated channels for the calibration signal receiving channel and the calibration signal sending channel, and the antenna existing in the RRU has a receiving channel and a sending channel, so that the receiving channel and the sending channel of the antenna can be multiplexed, and it should be noted that:
multiplexing a transmitting channel and a receiving channel of the same antenna; or,
the transmit path of the first antenna and the receive path of the second antenna are multiplexed.
EXAMPLE III
Fig. 3 is a structural diagram of an inter-RRU reciprocity calibration system provided in an embodiment of the present invention, and for convenience of description, only parts related to the embodiment of the present invention are shown, where the system includes a master RRU1 and a slave RRU2, where:
the main RRU1 is configured to receive, through a calibration signal receiving channel, a first calibration reference signal sent by the main RRU1 through a calibration signal sending channel, calculate an uplink channel according to the first calibration reference signal, receive a second calibration reference signal sent by the main RRU1 and the slave RRU2, calculate a downlink channel according to the second calibration reference signal, so as to calculate an inter-RRU reciprocity calibration result according to the uplink channel calculation result and the downlink channel calculation result, and perform inter-RRU reciprocity calibration according to the inter-RRU reciprocity calibration result, where the first calibration reference signal and the second calibration reference signal are transmitted through a radio frequency cable.
The slave RRU2 is configured to receive, by a calibration signal receiving unit, a first calibration reference signal sent by the master RRU1 through a calibration signal sending channel, and send, by the calibration signal sending channel, a second calibration reference signal to the master RRU1, so that the master RRU1 calculates an uplink channel according to the first calibration reference signal and a downlink channel according to the second reference signal, further calculates a calibration result of reciprocity between RRUs according to the calculation result of the uplink channel and the calculation result of the downlink channel, and performs calibration of reciprocity between RRUs according to the calibration result of reciprocity between RRUs.
In this embodiment of the present invention, after the master RRU1 and the slave RRU2 are interconnected, the master RRU1 sends a first calibration reference signal (i.e., an uplink channel calibration reference signal) through a calibration signal sending channel, the master RRU1 and the slave RRU2 receive the first calibration reference signal through a calibration signal receiving channel, and calculate an uplink channel according to the first calibration reference signal, where the first calibration reference signal is specifically delivered in a radio frequency cable during a delivery process.
After the master RRU1 and the slave RRU2 are interconnected, the master RRU1 and the slave RRU2 transmit a second calibration reference signal (i.e., a downlink channel calibration reference signal) through a calibration signal transmission channel, and a calibration signal reception channel of the master RRU1 receives the second calibration reference signal and calculates a downlink channel according to the second calibration reference signal, where the second calibration reference signal is delivered exclusively through a radio frequency cable during a delivery process. In addition, after obtaining the uplink channel calculation result and the downlink channel calculation result, the base station calculates the reciprocity calibration result between the RRUs according to the results, and the method for calculating the reciprocity calibration result between the RRUs uses the prior art, which is not described herein again.
The master RRU1 and the slave RRU2 connect calibration channel ports to a calibration channel interconnection apparatus through radio frequency cables, respectively, and the calibration channel ports are disposed on the RRU side and connected to a calibration signal receiving channel and a calibration signal sending channel of the RRU.
In the embodiment of the present invention, the calibration channel is a channel through which a Radio Remote Unit (Radio Remote Unit, RRU for short) transmits and receives a calibration reference signal, and usually, the RRU includes two calibration channels, that is, a calibration signal receiving channel and a calibration signal transmitting channel, and the calibration channel is connected to a calibration channel port in the RRU. The calibration channel ports and the calibration channel interconnection device are connected by a plurality of RRUs in the base station through radio frequency cables, so that the plurality of RRUs in the base station can be connected with each other through the radio frequency cables, the calibration channel ports and the calibration channel interconnection device, namely, the main RRU and the auxiliary RRUs are connected.
The main RRU1 is configured to receive, through a calibration signal receiving channel, a first calibration reference signal sent by the main RRU1 through a calibration signal sending channel, and includes:
the main RRU1 sends a first calibration reference signal to the calibration channel interconnection apparatus through a calibration signal sending channel;
the calibration channel interconnection apparatus divides the first calibration reference signal into multiple first calibration reference signals through a power divider, and sends the multiple first calibration reference signals to the master RRU1 and the slave RRU2, respectively;
the calibration signal receiving channels of the master RRU1 and the slave RRU2 respectively receive the multiple first calibration reference signals.
Wherein the receiving the second calibration reference signal sent by the master RRU1 and the slave RRU2 includes:
the master RRU1 and the slave RRU2 send a second calibration reference signal to the calibration channel interconnect over a calibration signal send channel;
the calibration channel interconnection apparatus synthesizes multiple paths of the second calibration reference signals into one path of second calibration reference signal through a power splitter, and sends the one path of second calibration reference signal to the main RRU1 respectively;
the calibration signal receiving channel of the main RRU1 receives the one path of second calibration reference signal.
In the embodiment of the present invention, the RRU connects the calibration channel port with the calibration channel interconnection apparatus through a radio frequency cable, the main RRU1 sends a first calibration reference signal to the main RRU1 and the slave RRU2 through the radio frequency cable, and the main RRU1 and the slave RRU2 calculate an uplink channel according to the first calibration reference signal; the main RRU1 and the slave RRU2 send the second calibration reference signal to the main RRU1 through the radio frequency cable, the main RRU1 calculates a downlink channel according to the second calibration reference signal, and obtains a reciprocity calibration result between the RRUs according to the uplink channel calculation result and the downlink channel calculation result, so that when the reciprocity calibration signal is sent between the RRUs, the influence of signals in air interface transmission on the reciprocity calibration signal is avoided, and the accuracy of the reciprocity calibration between the RRUs is improved.
As an alternative embodiment of the invention, the system further comprises a setting unit, wherein:
the setting unit is used for setting a main RRU, a slave RRU and a standby main RRU, wherein the standby main RRU is used as the main RRU when the main RRU is shut down, and the standby main RRU is used as the slave RRU when the main RRU runs.
As another alternative embodiment of the present invention, the system further comprises a setting unit, wherein:
the setting unit is used for:
when the number of the calibration channel ports is two, a radio frequency switch is arranged on the main RRU, so that the calibration signal receiving channel and the calibration signal sending channel are adjusted to different channels through the radio frequency switch; or,
when the number of the calibration channel ports is two, a radio frequency switch is arranged on the calibration channel interconnection device, so that the calibration signal receiving channel and the calibration signal sending channel are adjusted to different channels through the radio frequency switch.
As another optional embodiment of the present invention, the calibration signal sending channel and the calibration signal receiving channel of the master RRU and the slave RRU multiplex the sending channel and the receiving channel of the antenna in the RRU.
In the embodiment of the present invention, in the above embodiments, two channels are installed in the RRU as dedicated channels for the calibration signal receiving channel and the calibration signal sending channel, and the antenna existing in the RRU has a receiving channel and a sending channel, so that the receiving channel and the sending channel of the antenna can be multiplexed, and it should be noted that:
multiplexing a transmitting channel and a receiving channel of the same antenna; or,
the transmit path of the first antenna and the receive path of the second antenna are multiplexed.
Those skilled in the art can understand that each unit included in the above embodiments is only divided according to functional logic, but is not limited to the above division as long as the corresponding function can be realized; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
Claims (16)
1. A method for calibrating reciprocity between RRUs, the method comprising:
the method comprises the steps that a main RRU receives a first calibration reference signal sent by the main RRU through a calibration signal sending channel, and an uplink channel is calculated according to the first calibration reference signal;
a calibration signal receiving channel of the main RRU receives a second calibration reference signal sent by the main RRU and the slave RRU through a calibration signal sending channel, and calculates a downlink channel according to the second calibration reference signal so as to calculate a reciprocity calibration result between the RRUs according to the calculation result of the uplink channel and the calculation result of the downlink channel;
the master RRU and the slave RRU carry out reciprocity calibration between the RRUs according to the reciprocity calibration result between the RRUs;
wherein the first calibration reference signal and the second calibration reference signal are transmitted over a radio frequency cable.
2. The method of claim 1, wherein prior to the step of receiving the first calibration reference signal sent by the main RRU over the calibration signal transmission channel, the method further comprises:
the main RRU and the auxiliary RRU are respectively connected with a calibration channel port and a calibration channel interconnection device through radio frequency cables, and the calibration channel port is arranged on the side of the RRU and is connected with a calibration signal receiving channel and a calibration signal sending channel of the RRU.
3. The method of claim 1, wherein the step of receiving the first calibration reference signal sent by the main RRU through the calibration signal transmission channel comprises:
the main RRU sends a first calibration reference signal to a calibration channel interconnection device through a calibration signal sending channel;
the calibration channel interconnection device divides the first calibration reference signal into multiple first calibration reference signals through a power divider, and sends the multiple first calibration reference signals to the master RRU and the slave RRU respectively;
and the calibration signal receiving channels of the main RRU and the slave RRU respectively receive the plurality of first calibration reference signals.
4. The method of claim 1, wherein the step of the calibration signal receiving path of the master RRU receiving the master RRU and the second calibration reference signal sent from the RRU over the calibration signal sending path comprises:
the main RRU and the auxiliary RRU send a second calibration reference signal to the calibration channel interconnection device through the calibration signal sending channel;
the calibration channel interconnection device synthesizes multiple paths of the second calibration reference signals into one path of second calibration reference signal through a power divider, and sends the one path of second calibration reference signal to the main RRU respectively;
and the calibration signal receiving channel of the main RRU receives the second calibration reference signal.
5. The method of any of claims 1-4, wherein prior to the step of the calibration signal receiving channels of the master and slave RRUs receiving the first calibration reference signal sent by the master RRU over the calibration signal sending channel, the method further comprises:
the method comprises the steps that a main RRU, a slave RRU and a standby main RRU are arranged, the standby main RRU is used as the main RRU when the main RRU is shut down, and the standby main RRU is used as the slave RRU when the main RRU runs.
6. The method of claim 2, wherein prior to the steps of the calibration signal receiving channels of the master and slave RRUs receiving the first calibration reference signal sent by the master RRU over the calibration signal sending channel, the method further comprises:
when the number of the calibration channel ports is two, a radio frequency switch is arranged on the main RRU, so that the calibration signal receiving channel and the calibration signal sending channel are adjusted to different channels through the radio frequency switch; or,
when the number of the calibration channel ports is two, a radio frequency switch is arranged on the calibration channel interconnection device, so that the calibration signal receiving channel and the calibration signal sending channel are adjusted to different channels through the radio frequency switch.
7. The method of any of claims 1-4, wherein the calibration signal transmission and reception channels of the master and slave RRUs multiplex the transmission and reception channels of the antennas in the RRUs.
8. The method of claim 7, wherein the multiplexing the transmit and receive channels of the antennas in the RRU comprises:
multiplexing a transmitting channel and a receiving channel of the same antenna; or,
the transmit path of the first antenna and the receive path of the second antenna are multiplexed.
9. A system for reciprocity calibration between RRUs, the system comprising a master remote radio unit, RRU, and a slave RRU, wherein:
the main RRU is used for receiving a first calibration reference signal sent by the main RRU through a calibration signal sending channel, calculating an uplink channel according to the first calibration reference signal, receiving a second calibration reference signal sent by the main RRU and a slave RRU, calculating a downlink channel according to the second calibration reference signal so as to calculate a reciprocity calibration result between the RRUs according to the uplink channel calculation result and the downlink channel calculation result, and calibrating the reciprocity between the RRUs according to the reciprocity calibration result between the RRUs;
the slave RRU is used for receiving a first calibration reference signal sent by the main RRU through a calibration signal sending channel, and sending a second calibration reference signal to the main RRU through the calibration signal sending channel, so that the main RRU calculates an uplink channel according to the first calibration reference signal and a downlink channel according to the second calibration reference signal, further calculates a reciprocity calibration result between the RRUs according to the uplink channel calculation result and the downlink channel calculation result, and calibrates the reciprocity between the RRUs according to the reciprocity calibration result between the RRUs;
wherein the first calibration reference signal and the second calibration reference signal are transmitted over a radio frequency cable.
10. The system of claim 9, wherein the master and slave RRUs are further to:
the main RRU and the auxiliary RRU are respectively connected with a calibration channel port and a calibration channel interconnection device through radio frequency cables, and the calibration channel port is arranged on the side of the RRU and is connected with a calibration signal receiving channel and a calibration signal sending channel of the RRU.
11. The system of claim 9, wherein the main RRU is configured to receive a first calibration reference signal sent by the main RRU through a calibration signal sending channel, and the system comprises:
the main RRU sends a first calibration reference signal to a calibration channel interconnection device through a calibration signal sending channel;
the calibration channel interconnection device divides the first calibration reference signal into multiple first calibration reference signals through a power divider, and sends the multiple first calibration reference signals to the master RRU and the slave RRU respectively;
and the calibration signal receiving channels of the main RRU and the slave RRU respectively receive the plurality of first calibration reference signals.
12. The system of claim 9, wherein the receiving the second calibration reference signals sent by the master RRU and the slave RRUs comprises:
the main RRU and the auxiliary RRU send a second calibration reference signal to the calibration channel interconnection device through the calibration signal sending channel;
the calibration channel interconnection device synthesizes multiple paths of the second calibration reference signals into one path of second calibration reference signal through a power divider, and sends the one path of second calibration reference signal to the main RRU respectively;
and the calibration signal receiving channel of the main RRU receives the second calibration reference signal.
13. The system of any one of claims 9 to 12, further comprising a setup unit, wherein:
the setting unit is used for setting a main RRU, a slave RRU and a standby main RRU, wherein the standby main RRU is used as the main RRU when the main RRU is shut down, and the standby main RRU is used as the slave RRU when the main RRU runs.
14. The system of claim 10, further comprising a setup unit, wherein:
the setting unit is used for:
when the number of the calibration channel ports is two, a radio frequency switch is arranged on the main RRU, so that the calibration signal receiving channel and the calibration signal sending channel are adjusted to different channels through the radio frequency switch; or,
when the number of the calibration channel ports is two, a radio frequency switch is arranged on the calibration channel interconnection device, so that the calibration signal receiving channel and the calibration signal sending channel are adjusted to different channels through the radio frequency switch.
15. The system of any of claims 9-12, wherein the calibration signal transmission and reception channels of the master and slave RRUs multiplex the transmission and reception channels of antennas in the RRUs.
16. The system of claim 15, wherein multiplexing the transmit and receive channels for the antennas in the RRU comprises:
multiplexing a transmitting channel and a receiving channel of the same antenna; or,
the transmit path of the first antenna and the receive path of the second antenna are multiplexed.
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| US10033558B2 (en) * | 2016-10-04 | 2018-07-24 | Qualcomm Incorporated | Inter-eNB over-the-air calibration for reciprocity-based coordinated multipoint communications |
| EP3566339B1 (en) * | 2017-01-09 | 2022-12-07 | QUALCOMM Incorporated | Over-the-air calibration for reciprocity based ul mimo transmission |
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