CN109479205B - Antenna calibration method, device and base station - Google Patents

Abstract

Embodiments of the present invention provide an antenna calibration method, device, and base station. The method includes: the base station determines the location and duration of a silent time slot, wherein neither the base station nor the terminal sends and receives signals in the silent time slot; the The base station performs antenna calibration during the silent time slot. By using the antenna calibration method, device and base station provided by the embodiments of the present invention, the calibration sequence in the receiving channel of the base station can be prevented from being interfered by external signals during the antenna calibration process, and the accuracy of the antenna calibration can be ensured.

Description

Antenna calibration method, device and base station

technical field

Embodiments of the present invention relate to wireless communication technologies, and in particular, to an antenna calibration method, apparatus, and base station.

Background technique

In a wireless communication system, for a Time Division Duplexing (TDD) base station system, since the uplink and downlink use the same carrier frequency, it can theoretically be considered that the uplink physical propagation channel and the downlink physical propagation channel have the same carrier frequency. reciprocity. However, in the actual implementation process, the radio frequency end of each antenna needs two sets of circuits to respectively complete the signal transmission and reception. Due to the process error of the hardware, the nonlinear distortion of the amplifier, and the influence of the operating frequency, time, and external environment (such as temperature, humidity, etc.) on the characteristic response of each RF circuit, it is difficult to realize that the two sets of circuits at the RF end have Fully consistent feature. Therefore, for a baseband signal, the transmit channel and the receive channel are equivalently multiplied by different coefficients for the channel, resulting in impaired reciprocity of the channel. In order to eliminate the influence of the deviation between the receiving channel and the transmitting channel of each RF end on the channel and ensure the reciprocity of the RF channel, the RF channel needs to be calibrated to ensure that multiple remote RF modules (Radio Remote Unit, RRU for short) ) of the RF side transmit channel amplitude and phase consistency.

In the prior art, the method for calibrating the radio frequency channel is as follows: the base station system sends the same receive channel correction sequence to each radio frequency terminal by referring to the transmit channel, and each receive channel of the base station system receives the receive channel correction sequence according to the receive channel correction sequence. The correction sequence calculates the correction coefficient of the corresponding receiving channel, and performs amplitude and phase calibration on the corresponding receiving channel according to the correction coefficient.

Since the radio frequency channel calibration process is completed according to the receive channel correction sequence received by the base station system, if the receive channel of the base station system also receives other external signal inputs at the time of calibration, for example, the UE sends an uplink signal, it will cause the base station receive channel The signal-to-noise ratio of the calibration sequence decreases, resulting in a decrease in the calibration accuracy or even failure of the calibration.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide an antenna calibration method, device, and base station, which are used to solve the technical problem of low calibration accuracy when the base station system performs antenna calibration in the prior art. In a first aspect, an embodiment of the present invention provides an antenna calibration method, the method includes:

The base station determines the location and duration of the silent time slot, wherein neither the base station nor the terminal transmits and receives signals in the silent time slot; the base station performs antenna calibration in the silent time slot, thereby preventing the base station from performing antenna calibration during the process The calibration sequence in the receiving channel is interfered by external signals, which ensures the accuracy of antenna calibration.

Optionally, the base station determining the location and duration of the silent time slot includes: the base station acquiring an antenna calibration requirement; and the base station determining the location and duration of the silent time slot according to the antenna calibration requirement.

The base station determines the silent time slot according to the antenna calibration requirement, which can effectively use the time slot resources to transmit and receive signals normally while ensuring the calibration accuracy.

Optionally, after the base station determines the location and duration of the silent time slot, the method further includes: the base station sends indication information to the terminal, where the indication information includes: the location and duration of the silent time slot.

Optionally, the base station sends indication information to the terminal, including:

The base station sends the indication information to the terminal at a preset duration position before the start time of the silent time slot.

The base station sends the indication information to the terminal in advance before the silent time slot, thereby ensuring that the terminal can stop sending and receiving signals in the silent time slot.

Optionally, the method further includes: determining, by the base station, an occurrence period of the silent time slot. By determining the occurrence period of the silent time slot, the base station system and the terminal are kept silent periodically, so that the base station system periodically calibrates the antenna.

Optionally, the duration of the silent time slot is greater than the duration of the preset guard interval GP, so as to ensure that the base station system has enough time for antenna calibration and to ensure the smooth completion of the calibration process.

In a second aspect, an embodiment of the present invention further provides an antenna calibration device, including:

a determining module, configured to determine the position and duration of a silent time slot, wherein neither the antenna calibration device nor the terminal transmits and receives signals in the silent time slot;

A calibration module, configured to perform antenna calibration in the silent time slot.

Optionally, the determining module is specifically used for:

Obtain antenna calibration requirement parameters;

The location and duration of the silent time slot are determined according to the antenna calibration requirement parameter.

Optionally, the device further includes:

A sending module, configured to send indication information to the terminal after the determining module determines the location and duration of the silent time slot, where the indication information includes: the location and duration of the silent time slot.

Optionally, the sending module is specifically used for:

The base station sends the indication information to the terminal at a preset duration position before the start time of the silent time slot.

Optionally, the determining module is also used for:

The occurrence period of the silent time slot is determined.

Optionally, the duration of the silent time slot is greater than the duration of the preset guard interval GP.

The antenna calibration apparatus provided in the second aspect is used to execute the antenna calibration method provided in the first aspect, and its technical effect is similar to the antenna calibration method.

In a third aspect, an embodiment of the present invention further provides a base station, including:

a processor, configured to determine the position and duration of the silent time slot, wherein neither the antenna calibration device nor the terminal sends and receives signals in the silent time slot;

The processor is further configured to perform antenna calibration in the silent time slot.

Optionally, the processor is specifically used for:

Obtain antenna calibration requirement parameters;

The location and duration of the silent time slot are determined according to the antenna calibration requirement parameter.

Optionally, the base station further includes:

The transmitter is configured to send indication information to the terminal after the processor determines the location and duration of the silent time slot, where the indication information includes: the location and duration of the silent time slot.

Optionally, the transmitter is specifically used for:

The indication information is sent to the terminal at a preset duration position before the start time of the silent time slot.

Optionally, the processor is further configured to:

The occurrence period of the silent time slot is determined.

Optionally, the duration of the silent time slot is greater than the duration of the preset guard interval GP.

The base station provided in the third aspect is configured to execute the antenna calibration method provided in the first aspect, and its technical effect is similar to the antenna calibration method.

In a fourth aspect, an embodiment of the present invention further provides a base station, including a processor and a memory, where program instructions are stored in the memory, and the processor is configured to call the program instructions in the memory, so as to realize the provision of the first aspect. method of antenna calibration.

In the antenna calibration method, device and base station provided by the embodiments of the present invention, the location and duration of the silent time slot are determined by the base station, the base station and the terminal do not send and receive signals in the silent time slot, and the base station performs antenna calibration in the silent time slot, thereby preventing In the process of antenna calibration, the calibration sequence in the receiving channel of the base station is interfered by external signals, which ensures the accuracy of antenna calibration.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

FIG. 1 is a schematic flowchart of an antenna calibration method according to an embodiment of the present invention;

2 is a schematic diagram of a calibration time slot determined by an antenna calibration method according to an embodiment of the present invention;

3 is a schematic structural diagram of a transmission time interval (Transmission Time Interval, TTI for short) according to an embodiment of the present invention;

4 is a schematic diagram of a base station scheduling and configuring a silent time slot according to an embodiment of the present invention;

5 is a schematic diagram of a base station determining an occurrence period of a silent time slot according to an embodiment of the present invention;

6 is a schematic structural diagram of a radio frequency channel calibration of a base station system in an embodiment of the present invention;

7 is a schematic structural diagram of an antenna calibration apparatus according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a base station according to an embodiment of the present invention;

FIG. 9 is another schematic structural diagram of a base station according to an embodiment of the present invention.

Detailed ways

In order to eliminate the influence of the deviation between the receiving channel and the transmitting channel of each RF end on the channel and ensure the reciprocity of the RF channel during the wireless communication process, the base station system usually needs to calibrate the RF channel to ensure that multiple remote RF modules (Radio Remote Unit, RRU for short) transmit channel amplitude and phase consistency at the RF end. In order to prevent the base station system from receiving other external signal input during the process of radio frequency channel calibration, resulting in reduced calibration accuracy or even calibration failure, embodiments of the present invention provide an antenna calibration method, device and base station to ensure the smooth completion of the calibration process.

FIG. 1 is a schematic flowchart of an antenna calibration method according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of a calibration time slot determined by the antenna calibration method according to an embodiment of the present invention.

Referring to FIG. 1 and FIG. 2 , an embodiment of the present invention provides an antenna calibration method, where the execution subject of the antenna calibration method is a base station. The method includes:

S101: The base station determines the location and duration of a silent time slot, wherein neither the base station nor the terminal transmits and receives signals in the silent time slot.

Specifically, the base station determines the normal service time slot and the silent time slot of the radio frame, wherein the base station can send downlink signals or receive uplink signals in the normal service time slot; No signal is transmitted or received in the slot.

In a specific implementation process, the determining the location and duration of the silent time slot includes:

obtaining, by the base station, the antenna calibration requirement;

The base station determines the location and duration of the silent time slot according to the antenna calibration requirement.

Specifically, the base station can obtain the antenna calibration requirement by monitoring the change of the characteristic parameter of the base station system. The characteristic parameter of the base station system may be the operating frequency of the radio frequency circuit or the temperature and humidity of the external environment. When the variation of the characteristic parameter exceeds the preset threshold, the antenna calibration request can be issued.

After the base station determines the location and duration of the silent time slot, it further includes:

The base station sends indication information to the terminal, where the indication information includes: the location and duration of the silent time slot.

FIG. 3 is a schematic structural diagram of a transmission time interval (Transmission Time Interval, TTI for short) according to an embodiment of the present invention, and FIG. 4 is a schematic diagram of a base station scheduling and configuring a silent time slot according to an embodiment of the present invention.

Referring to FIG. 3, the silent time slot may be a part of or the entire TTI time slot segment in a specific TTI.

Please refer to FIG. 4 at the same time. Specifically, after acquiring the antenna calibration requirement, the base station sends downlink control instruction information to the terminal through the downlink control channel, instructing the terminal to keep silent in the silent time slot and stop sending the signal to the terminal. The base station transmits and receives signals from the base station.

Further, on the basis of the foregoing embodiment, the base station sends indication information to the terminal, including:

The base station sends the indication information to the terminal at a preset duration position before the start time of the silent time slot.

By sending the indication information to the terminal in advance by the base station before the silent time slot, it is ensured that the terminal can stop sending and receiving signals in the silent time slot.

Through the above-mentioned embodiments, the base station can determine the location and duration of the silent time slot in real time according to the calibration requirements, so that the base station system can ensure that more time slots can be used for normal data transmission and reception when the antenna calibration is not required, thereby ensuring that the base station system can While accurately calibrating the antenna, it saves system scheduling resources.

Optionally, the base station system may further determine the occurrence period of the silent time slot. By determining the occurrence period of the silent time slot, the base station system and the terminal are kept silent periodically, so that the base station system periodically calibrates the antenna.

Optionally, the duration of the silent time slot is greater than the duration of the preset guard interval GP. Setting the duration of the silent time slot to be greater than the duration of the preset guard interval GP can ensure that the base station system has enough time for antenna calibration and ensure the smooth completion of the calibration process.

FIG. 5 is a schematic diagram of a base station determining an occurrence period of a silent time slot according to an embodiment of the present invention.

Referring to FIG. 5, specifically, the base station system may determine the fixed position of the time slot entering the silent state, and enter the silent state at the fixed position of the time slot according to the occurrence period of the silent time slot, and the base station and the terminal stops sending and receiving signals at the same time. The occurrence period of the silent time slot can be specified by a protocol. The period can be of any length, for example: 1024 minutes, 30 minutes, and so on. Specifically, it can be set in advance according to the antenna performance of the base station system.

S102: The base station performs antenna calibration in the silent time slot.

FIG. 6 is a schematic structural diagram of a radio frequency channel calibration of a base station system in an embodiment of the present invention. Specifically, the process of performing antenna calibration by the base station is shown in FIG. 6 .

Referring to FIG. 6 , a radio frequency channel calibration structure of a base station system in an embodiment of the present invention includes a reference transmit channel, a radio frequency antenna splitter, and a receive channel. During calibration, after acquiring the receiving channel correction sequence, the base station system sends the receiving channel correction sequence to multiple radio frequency antennas through the reference transmit channel, and the receive channel of each radio frequency antenna is calculated according to the correction sequence and the A corresponding radio frequency correction coefficient is obtained by referring to the amplitude and phase deviation between the transmitting channels, and the receiving channel is calibrated according to the radio frequency correction coefficient.

In the antenna calibration method provided by the embodiment of the present invention, the base station determines the position and duration of the silent time slot, the base station and the terminal do not send and receive signals in the silent time slot, and the base station performs antenna calibration in the silent time slot, thereby preventing the base station from performing In the process of antenna calibration, the calibration sequence in the receiving channel is interfered by external signals, which ensures the accuracy of antenna calibration.

FIG. 7 is a schematic structural diagram of an antenna calibration apparatus according to an embodiment of the present invention.

Referring to FIG. 7, an antenna calibration apparatus provided by an embodiment of the present invention includes:

A determination module 710, configured to determine the position and duration of a silent time slot, wherein neither the antenna calibration device nor the terminal transmits and receives signals in the silent time slot;

A calibration module 720, configured to perform antenna calibration in the silent time slot.

Optionally, the determining module 710 is specifically configured to:

Obtain antenna calibration requirement parameters;

The location and duration of the silent time slot are determined according to the antenna calibration requirement parameter.

Optionally, the device further includes:

The sending module 730 is configured to send indication information to the terminal after the determining module determines the location and duration of the silent time slot, where the indication information includes: the location and duration of the silent time slot.

Optionally, the sending module 730 is specifically configured to:

The base station sends the indication information to the terminal at a preset duration position before the start time of the silent time slot.

Optionally, the determining module 710 is further configured to:

The occurrence period of the silent time slot is determined.

Optionally, the duration of the silent time slot is greater than the duration of the preset guard interval GP.

The antenna calibration apparatus provided by the embodiment of the present invention is used to execute the antenna calibration method provided by the above method embodiment, and the specific implementation manner and technical effect thereof are similar to those of the method embodiment, and are not repeated here.

FIG. 8 is a schematic structural diagram of a base station according to an embodiment of the present invention.

Referring to FIG. 8, a base station provided by an embodiment of the present invention includes:

a processor 810, configured to determine the position and duration of a silent time slot, wherein neither the antenna calibration apparatus nor the terminal sends and receives signals in the silent time slot;

The processor 810 is further configured to perform antenna calibration in the silent time slot.

Optionally, the processor 810 is specifically configured to:

Obtain antenna calibration requirement parameters;

The location and duration of the silent time slot are determined according to the antenna calibration requirement parameter.

Optionally, the base station further includes:

The transmitter 820 is configured to send indication information to the terminal after the processor 810 determines the location and duration of the silent time slot, where the indication information includes: the location and duration of the silent time slot.

Optionally, the transmitter 820 is specifically used for:

The indication information is sent to the terminal at a preset duration position before the start time of the silent time slot.

Optionally, the processor 810 is further configured to:

The occurrence period of the silent time slot is determined.

Optionally, the duration of the silent time slot is greater than the duration of the preset guard interval GP.

The base station provided by the embodiment of the present invention is used to execute the antenna calibration method provided by the foregoing method embodiment, and the specific implementation manner and technical effect thereof are similar to those of the method embodiment, and details are not described herein again.

FIG. 9 is another schematic structural diagram of a base station according to an embodiment of the present invention.

Referring to FIG. 9, a base station provided by an embodiment of the present invention includes:

A processor 910 and a memory 920, where program instructions are stored in the memory 920, and the processor 910 is used to call the program instructions in the memory to implement the antenna calibration method provided by the above method embodiments, and its specific implementation manner The technical effect is similar to that of the method embodiment, which is not repeated here.

Those of ordinary skill in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by program instructions related to hardware. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the steps including the above method embodiments are executed; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other media that can store program codes.

Claims (15)

1. an antenna calibration method, is characterized in that, comprises: The base station determines the location and duration of the silent time slot, wherein neither the base station nor the terminal transmits and receives signals in the silent time slot; The base station performs antenna calibration in the silent time slot, wherein the duration of the silent time slot is greater than the duration of a preset guard interval GP. 2. The method according to claim 1, wherein the base station determines the location and duration of the silent time slot, comprising: obtaining, by the base station, the antenna calibration requirement; The base station determines the location and duration of the silent time slot according to the antenna calibration requirement. 3. The method according to claim 1 or 2, wherein after the base station determines the location and duration of the silent time slot, the method further comprises: The base station sends indication information to the terminal, where the indication information includes: the location and duration of the silent time slot. 4. The method according to claim 3, wherein the base station sends indication information to the terminal, comprising: The base station sends the indication information to the terminal at a preset duration position before the start time of the silent time slot. 5. The method according to claim 1, wherein the method further comprises: The base station determines the occurrence period of the silent time slot. 6. An antenna calibration device, characterized in that, comprising: a determining module, configured to determine the position and duration of a silent time slot, wherein neither the antenna calibration device nor the terminal transmits and receives signals in the silent time slot; A calibration module, configured to perform antenna calibration in the silent time slot, wherein the duration of the silent time slot is greater than the duration of a preset guard interval GP. 7. The device according to claim 6, wherein the determining module is specifically used for: Obtain antenna calibration requirement parameters; The location and duration of the silent time slot are determined according to the antenna calibration requirement parameter. 8. The apparatus of claim 7, further comprising: A sending module, configured to send indication information to the terminal after the determining module determines the location and duration of the silent time slot, where the indication information includes: the location and duration of the silent time slot. 9. The device according to claim 8, wherein the sending module is specifically configured to: The indication information is sent to the terminal at a preset duration position before the start time of the silent time slot. 10. The apparatus according to claim 6, wherein the determining module is further configured to: The occurrence period of the silent time slot is determined. 11. A base station, comprising: a processor, configured to determine the position and duration of the silent time slot, wherein neither the antenna calibration device nor the terminal transmits and receives signals in the silent time slot; The processor is further configured to perform antenna calibration in the silent time slot, where the duration of the silent time slot is greater than the duration of a preset guard interval GP. 12. The base station according to claim 11, wherein the processor is specifically configured to: Obtain antenna calibration requirement parameters; The location and duration of the silent time slot are determined according to the antenna calibration requirement parameter. 13. The base station according to claim 12, further comprising: A transmitter, configured to send indication information to the terminal after the processor determines the location and duration of the silent time slot, where the indication information includes: the location and duration of the silent time slot. 14. The base station according to claim 13, wherein the transmitter is specifically configured to: The indication information is sent to the terminal at a preset duration position before the start time of the silent time slot. 15. The base station according to claim 11, wherein the processor is further configured to: The occurrence period of the silent time slot is determined.

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