WO2018119792A1

WO2018119792A1 - Antenna calibration method, device, and base station

Info

Publication number: WO2018119792A1
Application number: PCT/CN2016/112759
Authority: WO
Inventors: 李智; 董旭晖
Original assignee: 华为技术有限公司
Priority date: 2016-12-28
Filing date: 2016-12-28
Publication date: 2018-07-05
Also published as: CN109479205A; CN109479205B

Abstract

Provided in embodiments of the present invention are an antenna calibration method, device, and base station. The method comprises: a base station determining a position and duration of a silent time slot, wherein none of the base station and terminals receives or transmits a signal within the silent time slot; and the base station performing antenna calibration during the silent time slot. The antenna calibration method, device, and base station provided in the embodiments of the present invention can be employed to prevent interference of an external signal while a base station is receiving a calibration sequence in a channel during an antenna calibration process, thus ensuring precision of antenna calibration.

Description

Antenna calibration method, device and base station

Technical field

Embodiments of the present invention relate to a wireless communication technology, 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, the uplink physical propagation channel and the downlink physical propagation channel can theoretically be considered to have Reciprocity. However, in the actual implementation process, the RF end of each antenna requires two sets of circuits to complete the transmission and reception of signals. Due to hardware process errors, nonlinear distortion of the amplifier, and the influence of operating frequency, time, and external environment (such as temperature, humidity, etc.) on the characteristic response of each RF circuit, it is difficult to realize two sets of circuits on the RF side. Fully consistent features. Thus, for a baseband signal, the transmit channel and the receive channel equivalently multiply the channel by different coefficients, resulting in impaired channel reciprocity. In order to eliminate the influence of the deviation between the receiving channel and the transmitting channel of each RF terminal on the channel and ensure the reciprocity of the RF channel, the RF channel needs to be calibrated to ensure multiple remote radio units (Radio Remote Unit, RRU for short). The RF side transmits the channel amplitude and phase consistency.

In the prior art, the method for calibrating the radio frequency channel is: the base station system sends the same receiving channel correction sequence to each radio frequency end by using the reference transmitting channel, and each receiving channel of the base station system receives the receiving channel correction sequence according to the receiving channel. The correction sequence calculates a correction coefficient of the corresponding receiving channel, and performs amplitude phase calibration on the corresponding receiving channel according to the correction coefficient.

Since the radio frequency channel calibration process is completed according to the receiving channel correction sequence received by the base station system, if the receiving channel of the base station system receives other external signal input, for example, the UE sends an uplink signal, the base station receives the channel. The signal-to-noise ratio of the mid-calibration sequence is reduced, resulting in reduced calibration accuracy or even calibration failure.

Summary of the invention

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

The base station determines the location and duration of the silent time slot, wherein the base station and the terminal do not send and receive 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 The calibration sequence in the receiving channel is interfered by external signals, ensuring the accuracy of the antenna calibration.

Optionally, the determining, by the base station, a location and a duration of the silent time slot, the base station acquiring an antenna calibration requirement, and determining, by the base station, a location and a 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, and can effectively use the time slot resource to perform normal signal transmission and reception while ensuring the calibration accuracy.

Optionally, after the determining, by the base station, the location and the duration of the silent time slot, the base station further includes: sending, by the base station, indication information, where the indication information includes: a location and a duration of the silent time slot.

Optionally, the sending, by the base station, the indication information to the terminal includes:

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 ensures that the terminal can stop transmitting and receiving signals in the silent time slot by transmitting indication information to the terminal in advance before the silent time slot.

Optionally, the method further includes: the base station determining an appearance period of the silent slot. The base station system and the terminal are periodically kept silent by determining the occurrence period of the silent time slot for the base station system to periodically calibrate the antenna.

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

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

a determining module, configured to determine a location and duration of the silent time slot, wherein the antenna calibration device and the terminal do not send and receive signals in the silent time slot;

A calibration module for performing antenna calibration within the silent time slot.

Optionally, the determining module is specifically configured to:

Obtain antenna calibration requirement parameters;

Determining the location and duration of the silent time slot based on the antenna calibration requirement parameter.

Optionally, the device further includes:

And 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: a location and a duration of the silent time slot.

Optionally, the sending module is specifically configured to:

Optionally, the determining module is further configured to:

A period of occurrence 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 second aspect is configured to perform the antenna calibration method provided by the first aspect, and the technical effect thereof 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 a location and duration of the silent time slot, wherein the antenna calibration device and the terminal do not send and receive 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 configured to:

Obtain antenna calibration requirement parameters;

Optionally, the base station further includes:

And 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: a location and a duration of the silent time slot.

Optionally, 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.

Optionally, the processor is further configured to:

A period of occurrence of the silent time slot is determined.

a base station provided by the third aspect, for performing the antenna calibration method provided by the first aspect, The 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 the memory stores program instructions, and the processor is configured to invoke program instructions in the memory to implement the first aspect. Antenna calibration method.

The antenna calibration method, device and base station provided by the embodiments of the present invention determine the location and duration of the silent time slot by the base station, and 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 calibration sequence in the receiving channel is interfered by the external signal during the antenna calibration process, which ensures the accuracy of the antenna calibration.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

1 is a schematic flow chart 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 (TTI) according to an embodiment of the present invention;

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

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

6 is a schematic diagram of a radio frequency channel calibration structure of a base station system according to an embodiment of the present invention;

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

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 description

In order to eliminate the influence of the deviation between the receiving channel and the transmitting channel of each RF terminal on the channel during the wireless communication process and ensure the reciprocity of the RF channel, the base station system usually needs to calibrate the RF channel to ensure multiple remote RF modules. (Radio Remote Unit, RRU for short) The amplitude and phase consistency of the transmission channel of the radio end. In order to prevent the base station system from performing RF channel calibration The embodiment of the present invention provides an antenna calibration method, apparatus, and base station for ensuring successful completion of the calibration process.

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 an 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 an execution body of the antenna calibration method is a base station. The method includes:

S101: The base station determines a location and a duration of the silent time slot, where the base station and the terminal do not send and receive signals in the silent time slot.

Specifically, the base station determines a normal service time slot and a silent time slot of the radio frame, where the base station may send a downlink signal or receive an uplink signal in the normal service time slot; when the base station is in the silent state Neither the signal nor the signal is received in the slot.

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

The base station acquires an 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 may acquire an antenna calibration requirement by monitoring a change of a characteristic parameter of the base station system. The characteristic parameters of the base station system may be the operating frequency of the radio frequency circuit or the temperature and humidity of the external environment. The antenna calibration requirement can be issued when the change of the characteristic parameter exceeds a preset threshold.

After the determining, by the base station, 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: a location and a duration of the silent time slot.

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

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

Referring to FIG. 4, in particular, after acquiring the antenna calibration requirement, the base station sends downlink control indication information to the terminal through the downlink control channel, indicating that the terminal remains silent in the silent time slot, and stops The base station transmits signals and receives signals from a base station.

Further, on the basis of the foregoing embodiment, the sending, by the base station, the indication information to the terminal includes:

Through the foregoing implementation manner, the base station can determine the location and duration of the silent time slot in real time according to the calibration requirement, 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 needed, thereby ensuring that the base station system can While the antenna is accurately calibrated, system scheduling resources are saved.

Optionally, the base station system may also determine an appearance period of the silent slot. The base station system and the terminal are periodically kept silent by determining the occurrence period of the silent time slot for the base station system to periodically calibrate 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 longer than the preset protection interval GP can ensure that the base station system has sufficient antenna calibration time to ensure the smooth completion of the calibration process.

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

Referring to FIG. 5, in particular, the base station system may determine a fixed position of a time slot entering a silent state, and enter a silent state at a fixed position of the time slot according to an appearance period of the silent time slot, where the base station And the terminal stops transmitting and receiving signals at the same time. The period of occurrence of the silent time slot can be specified by a protocol. The period can be any length of time, for example: 1024 minutes, 30 minutes, and the like. Specifically, the setting can be made 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 diagram of a radio frequency channel calibration structure of a base station system according to an embodiment of the present invention. Specifically, the process of performing antenna calibration by the base station is as shown in FIG. 6.

Referring to FIG. 6, the radio frequency channel calibration structure of the base station system in the embodiment of the present invention includes a reference transmission channel, a radio frequency antenna splitter, and a receiving channel. During calibration, after the base station system acquires the receiving channel correction sequence, the receiving channel correction sequence is sent to the plurality of radio frequency antennas through the reference transmitting channel, and the receiving channel of each radio frequency antenna is calculated according to the correction sequence. Referring to the amplitude phase deviation between the transmission channels, a corresponding radio frequency correction coefficient is obtained, and the receiving channel is calibrated according to the radio frequency correction coefficient.

The antenna calibration method provided by the embodiment of the present invention determines the location and time of the silent time slot by the base station. Long, 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 being interfered by the external signal in the calibration sequence in the receiving channel during the antenna calibration process, thereby ensuring The accuracy of the 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 according to an embodiment of the present invention includes:

a determining module 710, configured to determine a location and duration of the silent time slot, wherein the antenna calibration device and the terminal do not send and receive signals in the silent time slot;

The calibration module 720 is configured to perform antenna calibration within the silent time slot.

Optionally, the determining module 710 is specifically configured to:

Obtain antenna calibration requirement parameters;

Optionally, the device further includes:

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

Optionally, the sending module 730 is specifically configured to:

Optionally, the determining module 710 is further configured to:

A period of occurrence of the silent time slot is determined.

The antenna calibration apparatus provided by the embodiment of the present invention is used to perform the antenna calibration method provided by the foregoing method embodiment. The specific implementation manner and technical effects are similar to the method embodiments, and are not described herein again.

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:

The processor 810 is configured to determine a location and duration of the silent time slot, where the antenna calibration device and the terminal do not send and receive 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;

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: a location and a duration of the silent time slot.

Optionally, the transmitter 820 is specifically configured to:

Optionally, the processor 810 is further configured to:

A period of occurrence of the silent time slot is determined.

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

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

The processor 910 and the memory 920, the memory 920 stores a program instruction, and the processor 910 is configured to invoke the program instruction in the memory to implement the antenna calibration method provided by the foregoing method embodiment, and the specific implementation manner thereof The technical effects are similar to the method embodiments, and are not described herein again.

One of ordinary skill in the art will appreciate that all or part of the steps to implement the various method embodiments described above may be accomplished by hardware associated with the program instructions. The aforementioned program can be stored in a computer readable storage medium. The program, when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes various media that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

Claims

An antenna calibration method, comprising:

Determining, by the base station, a location and a duration of the silent time slot, wherein the base station and the terminal do not send and receive signals in the silent time slot;

The base station performs antenna calibration within the silent time slot.
The method according to claim 1, wherein the base station determines the location and duration of the silent time slot, including:

The base station acquires an antenna calibration requirement;

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

The base station sends indication information to the terminal, where the indication information includes: a location and a duration of the silent time slot.
The method according to claim 3, wherein the sending, by the base station, the indication information to the terminal comprises:

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 method of claim 1 further comprising:

The base station determines an appearance period of the silent slot.
The method according to claim 1, wherein the duration of the silent time slot is greater than the duration of the preset guard interval GP.
An antenna calibration apparatus, comprising:

a determining module, configured to determine a location and duration of the silent time slot, wherein the antenna calibration device and the terminal do not send and receive signals in the silent time slot;

A calibration module for performing antenna calibration within the silent time slot.
The device according to claim 7, wherein the determining module is specifically configured to:

Obtain antenna calibration requirement parameters;

Determining the location and duration of the silent time slot based on the antenna calibration requirement parameter.
The device according to claim 8, further comprising:

a sending module, after the determining module determines the location and duration of the silent time slot, The terminal sends indication information, where the indication information includes: a location and a duration of the silence slot.
The device according to claim 9, wherein the sending module 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.
The device according to claim 7, wherein the determining module is further configured to:

A period of occurrence of the silent time slot is determined.
The apparatus according to claim 7, wherein the duration of the silent time slot is greater than the duration of the preset guard interval GP.
A base station, comprising:

a processor, configured to determine a location and duration of the silent time slot, wherein the antenna calibration device and the terminal do not send and receive signals in the silent time slot;

The processor is further configured to perform antenna calibration in the silent time slot.
The base station according to claim 13, wherein the processor is specifically configured to:

Obtain antenna calibration requirement parameters;

Determining the location and duration of the silent time slot based on the antenna calibration requirement parameter.
The base station according to claim 14, further comprising:

And 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: a location and a duration of the silent time slot.
The base station according to claim 15, 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.
The base station according to claim 13, wherein the processor is further configured to:

A period of occurrence of the silent time slot is determined.
The base station according to claim 13, wherein the duration of the silence slot is greater than the duration of the preset guard interval GP.