CN115514427A

CN115514427A - Method for transmitting calibration signal, base station and computer readable storage medium

Info

Publication number: CN115514427A
Application number: CN202110631645.5A
Authority: CN
Inventors: 楼梦婷; 金婧; 吴丹; 夏亮; 王启星
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Priority date: 2021-06-07
Filing date: 2021-06-07
Publication date: 2022-12-23

Abstract

A method for transmitting a calibration signal, a base station and a computer readable storage medium, the method comprising: the first base station transmits a first calibration signal to the second base station in a first transmission window; the first base station receives a second calibration signal sent by a second base station in a first receiving window; wherein the first transmission window and the first reception window are both located in a special time slot. The invention can utilize limited transmitting resource to calibrate the transmitting and receiving end channel so as to improve the overall performance of the mobile communication system.

Description

Method for transmitting calibration signal, base station and computer readable storage medium

Technical Field

The present invention relates to the field of mobile communication technologies, and in particular, to a calibration signal transmission method, a base station, and a computer-readable storage medium.

Background

Distributed very large scale Multiple Input Multiple Output (MIMO) is a solution to the demand for 6G higher capacity communications. Through coherent/incoherent transmission of a plurality of Base Stations (BS), the distributed ultra-large scale MIMO can eliminate interference and improve user experience on one hand, and can improve overall capacity on the other hand, so that the distributed ultra-large scale MIMO has a wide application prospect in a high-capacity scene.

In a distributed very large scale MIMO system, the base station needs to know the downlink channel information to preprocess the user data. For a Time Division Duplex (TDD) system, because the same propagation channel (the same frequency) is shared for transmitting and receiving, theoretically, the uplink propagation channel is considered to be equal to the downlink propagation channel, that is, the uplink channel and the downlink channel have reciprocity.

However, in physical implementation, two sets of circuits are required at the rf end of the antenna to respectively complete signal transmission and reception, and it is difficult to implement that the two sets of circuits at the rf end have identical characteristics due to process errors in hardware and nonlinear distortion of the amplifier, so that the TDD system has a challenge that uplink and downlink channels are not necessarily completely equivalent. In addition, the characteristic response of each rf circuit also changes with environmental (e.g., temperature, humidity, etc.) and time. Thus, the equivalent pair signals of the transmission channel and the reception channel are multiplied by different coefficients, i.e., tx and Rx, in view of the influence on the baseband signal. This results in impaired reciprocity of the channel. Therefore, calibration of the radio frequency link needs to be performed.

Disclosure of Invention

At least one embodiment of the present invention provides a calibration signal transmission method, a terminal and a network device, which can perform transceiver channel calibration using limited transmission resources to improve the overall performance of a mobile communication system.

According to an aspect of the present invention, at least one embodiment provides a method for transmitting a calibration signal, including:

the first base station transmits a first calibration signal to the second base station in a first transmission window;

the first base station receives a second calibration signal sent by a second base station in a first receiving window;

wherein the first transmission window and the first reception window are both located in a special time slot.

Further, in accordance with at least one embodiment of the present invention, after transmitting the first calibration signal, the method further comprises:

before the first reception window arrives, the preparation for switching the signal transmission to reception is completed.

Further, in accordance with at least one embodiment of the present invention, before transmitting the first calibration signal, the method further comprises:

acquiring configuration parameters of a calibration signal, wherein the configuration parameters comprise at least one of the following:

a transmission mode of the calibration signal, the transmission mode including periodic calibration and/or triggered calibration;

a length W of the first transmission window over which the first calibration signal is transmitted ₁ ；

A length W of the first receive window over which the second calibration signal is received ₂ ；

A transmit-receive calibration time interval Deltat between the first transmit window and the first receive window ₁ 。

Further, in accordance with at least one embodiment of the present invention, the configuration parameters further include:

when the sending mode is periodic calibration, calibrating the sending period of the signal; alternatively, the first and second liquid crystal display panels may be,

calibrating a trigger event of a signal when the transmission mode is a trigger calibration.

Further, in accordance with at least one embodiment of the present invention, there is also provided:

receiving configuration parameters of the adjusted calibration signal, wherein the configuration parameters of the adjusted calibration signal are obtained by dynamically adjusting the network according to system requirements;

and adjusting the receiving and transmitting modes of the calibration signals according to the adjusted configuration parameters of the calibration signals.

Further in accordance with at least one embodiment of the present invention, the transceive calibration time interval Δ t ₁ The length of the first sending window and the length of the first receiving window are smaller than the length of a special time slot, and the first sending window and the first receiving window are both positioned in the same special time slot;

alternatively, the first and second electrodes may be,

the transmit-receive calibration time interval Δ t ₁ And the first sending window and the first receiving window are respectively positioned in different special time slots.

Furthermore, in accordance with at least one embodiment of the present invention, 0 < W in the case where the first transmission window and the first reception window are both located within the same special time slot ₁ ≤W ₂ < Tsym/2, and Δ t ₁ -W ₂ ≥τ ₁ ，△t ₁ -W ₁ ≥τ ₁ Time interval Δ t for calibration of transmission and reception ₁ Less than the length of a particular slot but not less than the length of an OFDM symbol;

in the case that the first transmission window and the first receiving window are respectively positioned in different special time slots, W is more than 0 ₁ ≤W ₂ < Tsym, transmit-receive calibration time Interval Δ t ₁ Is equal to tau ₁ And at least one frame structure period;

wherein Tsym represents the duration of an OFDM symbol occupied by a non-service time slot in a special time slot, and tau ₁ Indicating a handover preparation delay from the transmission of the signal of the first base station to the reception.

Further, according to at least one embodiment of the present invention, a length of the first transmission window is the same as a length of a second transmission window, which is a time window in which the second base station transmits the second calibration signal;

and/or the presence of a gas in the gas,

the length of the first receiving window is the same as the length of a second receiving window, and the second receiving window is a time window for the second base station to receive the first calibration signal.

Further in accordance with at least one embodiment of the present invention, the starting position of the first transmission window is the same as the starting position of the second reception window; and/or the presence of a gas in the gas,

the starting position of the first receiving window is the same as that of the second sending window.

According to another aspect of the present invention, at least one embodiment provides a first base station comprising:

a transceiver for transmitting a first calibration signal to a second base station within a first transmission window; receiving a second calibration signal sent by a second base station in a first receiving window; wherein the first transmission window and the first reception window are both located in a special time slot.

and the processor is used for completing the preparation of switching from signal transmission to signal reception before the first receiving window arrives after the first calibration signal is transmitted.

Furthermore, in accordance with at least one embodiment of the present invention, the transceiver is further configured to obtain configuration parameters of the calibration signal before transmitting the first calibration signal, where the configuration parameters include at least one of:

According to another aspect of the present invention, at least one embodiment provides a first base station comprising: a processor, a memory and a program stored on the memory and executable on the processor, which when executed by the processor, performs the steps of the method as described above.

According to another aspect of the invention, at least one embodiment provides a computer readable storage medium having a program stored thereon, which when executed by a processor, performs the steps of the method as described above.

Compared with the prior art, the calibration signal transmission method, the base station and the computer readable storage medium provided by the embodiment of the invention have the advantages that the special time slot which does not occupy the service data is utilized to send and receive the calibration signal, so that the occupation of the sending resource of the service data is reduced, and the overall performance of a mobile communication system is improved.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 is a schematic view of an application scenario according to an embodiment of the present invention;

fig. 2 is a flowchart of a method for transmitting a calibration signal according to an embodiment of the present invention;

fig. 3 is another flowchart of a method for transmitting a calibration signal according to an embodiment of the present invention;

fig. 4 is a diagram illustrating an exemplary transmission method of a calibration signal according to an embodiment of the present invention;

fig. 5 is a diagram illustrating another example of a method for transmitting a calibration signal according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a first base station according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a first base station according to an embodiment of the present invention;

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

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

Detailed Description

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. In the description and in the claims "and/or" means at least one of the connected objects.

The techniques described herein are not limited to NR systems and Long Time Evolution (LTE)/LTE Evolution (LTE-Advanced) systems, and may also be used for various wireless communication systems, such as Code Division Multiple Access (CDMA), time Division Multiple Access (TDMA), frequency Division Multiple Access (FDMA), orthogonal Frequency Division Multiple Access (OFDMA), single carrier Frequency Division Multiple Access (SC-FDMA), and other systems. The terms "system" and "network" are often used interchangeably. CDMA systems may implement Radio technologies such as CDMA2000, universal Terrestrial Radio Access (UTRA), and so on. UTRA includes Wideband CDMA (Wideband Code Division Multiple Access, WCDMA) and other CDMA variants. TDMA systems may implement radio technologies such as Global System for Mobile communications (GSM). The OFDMA system may implement radio technologies such as Ultra Mobile Broadband (UMB), evolved-UTRA (E-UTRA), IEEE 802.21 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, flash-OFDM, etc. UTRA and E-UTRA are parts of the Universal Mobile Telecommunications System (UMTS). LTE and higher LTE (e.g., LTE-A) are new UMTS releases that use E-UTRA. UTRA, E-UTRA, UMTS, LTE-A, and GSM are described in documents from an organization named "third Generation Partnership project" (3 rd Generation Partnership project,3 GPP). CDMA2000 and UMB are described in documents from an organization named "third generation partnership project 2" (3 GPP 2). The techniques described herein may be used for both the above-mentioned systems and radio technologies, as well as for other systems and radio technologies. However, the following description describes the NR system for purposes of example, and NR terminology is used in much of the description below, although the techniques may also be applied to applications other than NR system applications.

The following description provides examples, and does not limit the scope, applicability, or configuration set forth in the claims. Changes may be made in the function and arrangement of elements discussed without departing from the spirit and scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For example, the described methods may be performed in an order different than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

Referring to fig. 1, fig. 1 is a block diagram of a wireless communication system to which an embodiment of the present invention is applicable. The wireless communication system includes a terminal 11 and a network device 12. The terminal 11 may also be referred to as a User terminal or a User Equipment (UE), and the terminal 11 may be a Mobile phone, a Tablet Personal Computer (Tablet Personal Computer), a Laptop Computer (Laptop Computer), a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), a Wearable Device (Wearable Device), or a vehicle-mounted Device, and the specific type of the terminal 11 is not limited in the embodiment of the present invention. The network device 12 may be a Base Station and/or a core network element, wherein the Base Station may be a 5G or later-version Base Station (e.g., a gNB, a 5G NR NB, etc.), or a Base Station in other communication systems (e.g., an eNB, a WLAN access point, or other access points, etc.), where the Base Station may be referred to as a node B, an evolved node B, an access point, a Base Transceiver Station (BTS), a radio Base Station, a radio Transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a node B, an evolved node B (eNB), a home node B, a home evolved node B, a WLAN access point, a WiFi node, or some other suitable terminology in the field, as long as the same technical effect is achieved, the Base Station is not limited to a specific technical vocabulary, and it should be noted that the Base Station in the NR system is only taken as an example in the embodiment of the present invention, but the specific type of the Base Station is not limited.

The base stations may communicate with the terminals 11 under the control of a base station controller, which may be part of the core network or some of the base stations in various examples. Some base stations may communicate control information or user data with the core network through a backhaul. In some examples, some of the base stations may communicate with each other, directly or indirectly, over backhaul links, which may be wired or wireless communication links. A wireless communication system may support operation on multiple carriers (waveform signals of different frequencies). A multi-carrier transmitter can transmit modulated signals on the multiple carriers simultaneously. For example, each communication link may be a multi-carrier signal modulated according to various radio technologies. Each modulated signal may be transmitted on a different carrier and may carry control information (e.g., reference signals, control channels, etc.), overhead information, data, and so on.

The base station may communicate wirelessly with the terminal 11 via one or more access point antennas. Each base station may provide communication coverage for a respective coverage area. The coverage area of an access point may be divided into sectors that form only a portion of the coverage area. A wireless communication system may include base stations of different types (e.g., macro, micro, or pico base stations). The base stations may also utilize different radio technologies, such as cellular or WLAN radio access technologies. The base stations may be associated with the same or different access networks or operator deployments. The coverage areas of different base stations (including coverage areas of base stations of the same or different types, coverage areas utilizing the same or different radio technologies, or coverage areas belonging to the same or different access networks) may overlap.

The communication links in a wireless communication system may comprise an Uplink for carrying Uplink (UL) transmissions (e.g., from terminal 11 to network device 12) or a Downlink for carrying Downlink (DL) transmissions (e.g., from network device 12 to terminal 11). The UL transmission may also be referred to as reverse link transmission, while the DL transmission may also be referred to as forward link transmission. Downlink transmissions may be made using licensed frequency bands, unlicensed frequency bands, or both. Similarly, uplink transmissions may be made using licensed frequency bands, unlicensed frequency bands, or both.

The radio frequency link mainstream calibration scheme comprises a hardware calibration method and an air interface calibration method. The hardware calibration method has higher requirements on cables and is difficult to actually deploy for base stations with far-distributed geographic positions, so the embodiment of the invention mainly considers the air interface calibration method. The existing air interface calibration scheme does not explicitly give out a specific signaling design for transmitting and receiving a calibration signal, so that service data transmission time may be occupied, and the overall performance of the system is affected.

Considering that a frame structure usually includes an uplink time slot, a downlink time slot and a special time slot, and a special non-service time slot exists in the special time slot besides uplink and downlink data services, in addition, the special time slot can also perform different proportions of the uplink data service, the downlink data service and the non-service according to network requirements. The method and the device utilize the special time slot to carry out the design of signal transmitting and receiving calibration, and can carry out the calibration of the channel of the transmitting and receiving end on the premise of not occupying the service data transmission, thereby improving the overall performance of the mobile communication system.

Specifically, the present application provides a method for transmitting and receiving calibration signals using a special time slot, which can fully utilize limited transmission resources to calibrate the transceiver channel, and is beneficial to improving the overall performance of the mobile communication system. Referring to fig. 2, a method for transmitting a calibration signal according to an embodiment of the present invention, when applied to a first base station, includes:

step 21, the first base station transmits a first calibration signal to the second base station within a first transmission window.

Step 22, the first base station receives a second calibration signal sent by a second base station in a first receiving window;

Through the above steps, in the embodiment of the present invention, the first base station sends the first calibration signal to the second base station in the first sending window, performs the switching from sending to receiving after sending the first calibration signal, and receives the second calibration signal sent by the second base station in the second receiving window, in the above processes, the first sending window and the first receiving window are both located in the special time slot, so that the calibration signal can be sent and received by using the special time slot that does not occupy the service data, the occupation of the sending resource of the service data is reduced, and the overall performance of the mobile communication system is improved.

Specifically, after the first calibration signal is transmitted, the first base station performs and completes preparation for switching from signal transmission to signal reception before the first reception window arrives, and then performs step 22.

After step 22, the present application may further calculate a calibration coefficient according to the first calibration signal received by the second base station and the second calibration signal received by the first base station, and perform channel calibration on the base station to be calibrated, where the base station to be calibrated is one of the first base station and the second base station. For a specific calibration algorithm, reference may be made to related implementations in the prior art, and details of the embodiments of the present invention are not described herein.

In the application, the network management function can send the configuration parameters of the calibration signals to each base station in advance, and at this time, the first base station can obtain the configuration parameters of the calibration signals, so as to configure the relevant parameters of the calibration signals locally. Specifically, the first base station may receive the configuration parameter from a network manager or other functional entities (e.g., a core network, a second base station, etc.), or may obtain the configuration parameter from a configuration file stored in advance locally. Specifically, the configuration parameter includes at least one of the following:

1) A transmission mode of the first calibration signal.

The transmission mode of the calibration signal comprises periodic calibration and/or triggered calibration, wherein the periodic calibration is to perform the transmission and reception of the calibration signal and the calculation of the calibration coefficient according to a preset period. Triggered calibration is the transmission and reception of calibration signals and the calculation of calibration coefficients performed at the trigger of a preset trigger event.

2) A length W of the first transmission window over which the first calibration signal is transmitted ₁ 。

Here, the first calibration signal is transmitted within a first transmission window, the length of which, i.e. the length W, can generally be configured ₁ 。

3) A length W of the first receive window over which the second calibration signal is received ₂ 。

Here, the length of the first receiving window, i.e. the length W, is generally configured to receive the second calibration signal transmitted by another base station (e.g. the second base station) in the first receiving window ₂ 。

4) A transmit-receive calibration time interval Δ t between the first transmit window and the first receive window ₁ 。

Here, the transmit-receive calibration time interval Deltat between the first transmission window and the first reception window ₁ Specifically, the duration may be a time period from the start time of the first transmission window to the start time of the first reception window. Of course, the embodiment of the present invention may also be configured with other reference times as an example, for example, configuring a time duration from the end time of the first sending window to the start time of the first receiving window, and the like.

Optionally, the configuration parameters further include any one of:

5) And calibrating the sending period of the signal when the sending mode is periodic calibration, or calibrating the trigger event of the signal when the sending mode is triggered calibration.

Here, the transmission period of the calibration signal refers to a period in which the calibration signal is transmitted, for example, the above first calibration signal is transmitted, and the calibration signal transmitted by another base station (for example, a second base station) is continuously received after the calibration signal is transmitted. The trigger event may specifically include an event type and a corresponding threshold. In case the trigger event is detected and the corresponding threshold requirements are met, the sending and receiving of calibration signals and the calculation of calibration coefficients will be triggered to be performed.

In the embodiment of the invention, the network can dynamically control the receiving and sending of the calibration signal. Specifically, the network may dynamically adjust the configuration parameters of the calibration signal according to system requirements, and send the adjusted configuration parameters to the base station. In this way, the first base station may receive the adjusted configuration parameter of the calibration signal, and adjust the transceiving mode of the calibration signal according to the adjusted configuration parameter of the calibration signal.

As a first implementation, the transmit-receive calibration time interval Δ t ₁ Is less than the length of a special time slot, at the time, the first sending window and the first receiving window are both positioned in the same special time slot, and in addition, the condition that W is more than 0 is satisfied ₁ ≤W ₂ < Tsym/2, and Δ t1-W ₂ ≥τ ₁ ，△t1-W ₁ ≥τ ₁ . Transmit-receive calibration interval Δ t ₁ Less than the length of a particular slot but not less than the length of an OFDM symbol. Here, tsym denotes the duration of an OFDM symbol without a traffic segment in a particular slot, τ ₁ Indicating a handover preparation delay from the transmission of the signal of the first base station to the reception.

As a second implementation, the transmit-receive calibration time interval Δ t ₁ And the length of the first transmission window is greater than that of one special time slot, and the first transmission window and the first receiving window are respectively positioned in different special time slots. In addition, 0 < W is satisfied ₁ ≤W ₂ ＜Tsym, transmit-receive calibration time Interval Δ t ₁ Is equal to tau ₁ And at least one frame structure period.

In this application, the lengths of the transmission windows of the first base station and the second base station may be the same, and/or the lengths of the reception windows may be the same. I.e. the length of the first transmission window is the same as the length of a second transmission window, which is a time window during which the second base station transmits the second calibration signal. In addition, the length of the first receiving window is the same as the length of a second receiving window, which is a time window in which the second base station receives the first calibration signal.

More specifically, the starting position of the first sending window is the same as the starting position of the second receiving window; and/or the starting position of the first receiving window is the same as the starting position of the second sending window.

Referring to fig. 3, the method for transmitting calibration signals according to the embodiment of the present invention, when applied to a second base station, includes:

step 31, the second base station receives the first calibration signal sent by the first base station in the second receiving window;

step 32, the second base station sends a second calibration signal to the first base station in a second sending window;

and the second receiving window and the second sending window are both positioned in a special time slot.

Through the above steps, in the embodiment of the present invention, the second base station receives the first calibration signal in the second receiving window, and sends the second calibration signal in the second sending reference, and in the above process, the second sending window and the second receiving window are both located in the special time slot, so that the special time slot that does not occupy the service data can be used to send and receive the calibration signal, the occupation of the sending resource of the service data is reduced, and the overall performance of the mobile communication system is improved.

After receiving the first calibration signal, the second base station performs and completes the preparation for handover of signal reception and transmission before the second transmission window arrives, and then transmits the second calibration signal in step 32.

After the step 32, the present application may further calculate a calibration coefficient according to the first calibration signal received by the second base station and the second calibration signal received by the first base station, and perform channel calibration on the base station to be calibrated, where the base station to be calibrated is one of the first base station and the second base station. For a specific calibration algorithm, reference may be made to related implementations in the prior art, and details of this embodiment of the present invention are not described herein again.

Similarly, the second base station may receive the configuration parameter of the calibration signal sent by the network management function, specifically, the first base station may receive the configuration parameter from the network management or other functional entities (such as a core network, a first base station, and the like), or may obtain the configuration parameter from a configuration file stored in advance locally, and the embodiment of the present invention is not limited to the above implementation manner. And then locally configure the relevant parameters of the correction signal. Specifically, the configuration parameter includes at least one of the following parameters:

1) A transmission mode of the second calibration signal. The transmission mode includes periodic calibration and/or triggered calibration.

2) A length W of the second receive window over which the first calibration signal is received ₄ 。

3) A length W of the second transmission window over which the second calibration signal is transmitted ₃ 。

Here, the first calibration signal is received within a second receive window and the second calibration signal is transmitted within a second transmit window.

4) A transceiving time interval Deltat between the second receiving window and the second transmitting window ₂ 。

Here, the transceiving time interval Deltat between the second receive window and the second transmit window ₂ Specifically, the duration may be a time period from the start time of the second receiving window to the start time of the second sending window. Of course, the embodiment of the present invention may also be configured with other reference times as an example, for example, configuring a time duration from the end time of the second receiving window to the start time of the second sending window, and the like.

Optionally, the configuration parameters further include:

Here, the transmission cycle of the calibration signal refers to transmission of the calibration signal in accordance with the cycle, for example, transmission of the above second calibration signal. For the definition of the trigger event, reference is made to the above description, and details are not repeated here.

In the embodiment of the invention, the network can dynamically control the receiving and sending of the calibration signal. Specifically, the network may dynamically adjust the configuration parameters of the calibration signal according to system requirements, and send the adjusted configuration parameters to the base station. In this way, the second base station may receive the adjusted configuration parameter of the calibration signal, and adjust the transceiving mode of the calibration signal according to the adjusted configuration parameter of the calibration signal.

As a first implementation, the transmit-receive calibration time interval Δ t ₂ The length of the second sending window and the length of the second receiving window are smaller than the length of a special time slot, the second sending window and the second receiving window are both positioned in the same special time slot, and in addition, the condition that W is more than 0 is met ₃ ≤W ₄ < Tsym/2, and Δ t2-W ₄ ≥τ ₂ ，△t ₂ -W ₃ ≥τ ₂ Time interval Δ t for calibration of transmission and reception ₂ Less than the length of a particular slot but not less than the length of an OFDM symbol. Here, tsym denotes the duration of an OFDM symbol occupied by a non-traffic period in a particular slot, τ ₂ Indicating a handover preparation delay for the transceiving of the second base station.

As a second implementation, the transmit-receive calibration time interval Δ t ₂ The second sending window and the second receiving window are respectively positioned in different special time slots when the length of the second sending window is larger than the length of one special time slot, and in addition, the condition that W is more than 0 is met ₃ ≤W ₄ < Tsym, transmit-receive calibration time Interval Δ t ₂ Equal to tau ₂ And at least one frame structure period.

In this application, the lengths of the transmission windows of the first base station and the second base station may be the same, and/or the lengths of the reception windows may be the same. I.e. the length of the second transmission window is the same as the length of the first transmission window, and/or the length of the second reception window is the same as the length of the first reception window.

More specifically, the starting position of the second receiving window is the same as the starting position of the first sending window; and/or the starting position of the second sending window is the same as the starting position of the first receiving window.

Preferably, in an embodiment of the present invention, the transmit/receive calibration time interval Δ t ₁ And Δ t ₂ May be equal to W above ₁ And W ₃ May be equal to W ₂ And W ₄ May be equal. In each of the following examples, the description will be made with an example in which both are equal, at which time Δ t ₁ And Δ t ₂ Are all represented by Δ t, W ₁ And W ₃ All adopt W ₁ To represent W ₂ And W ₄ All adopt W ₂ Is given by, and let τ be assumed ₁ And τ ₂ Equal, all are represented by τ.

The methods of the embodiments of the present invention are described above from the first base station and the second base station, respectively. As can be seen from the above solutions, the method for sending a calibration signal according to the embodiment of the present invention includes:

(1) Network configuration parameters

The network (such as network management) configures some parameters for transmitting calibration signals by using special time slots: calibration signaling mode (periodic calibration or triggered calibration, if periodic calibration, it is necessary to configure a calibration signaling period, if triggered calibration, it is necessary to configure a trigger event entry condition and an exit condition and corresponding thresholds), calibration signaling window length (e.g. the above first signaling window and second signaling window), and transceiver calibration time interval. Based on the configuration parameters, the first base station and the second base station mutually transmit and receive calibration signals; based on the received signal, the calculation of the channel calibration coefficient is completed and used for channel calibration. In this example

(2) The first base station transmits a calibration signal

The first base station determines the length of a first transmission window of the calibration signal according to the network configuration. When the first calibration signal is transmitted, the first calibration signal transmission is required to be completed in the first transmission window.

(3) The second base station receives the calibration signal

And the second base station determines the length of the second receiving window according to the network configuration parameters. Wherein, the second receiving window start position may be the same as the first transmitting window start position. When receiving the first calibration signal, the first calibration signal sent by the first base station needs to be received in the second receiving window.

(4) The second base station transmits the calibration signal

After the second base station completes receiving the first calibration signal, it needs to complete the switch of receiving and sending before the next sending window arrives.

The second base station determines a length of a second transmission window of the calibration signal according to the network configuration. And the time interval between the starting position of the second sending window and the starting position of the second receiving window is equal to the transceiving calibration time interval delta t configured by the network. When the calibration signal is transmitted, the calibration signal transmission needs to be completed in the second transmission window.

Furthermore, the time interval Δ t between the starting position of the second sending window and the starting position of the second receiving window may be smaller than a special time slot but at least one OFDM symbol length, that is, the second base station may sequentially complete the receiving and sending of the calibration signal in the same special time slot; Δ t may also be equal to the sum of several frame structure periods and the switching delay, that is, the second base station receives and transmits the calibration signal in different special time slots respectively.

(5) The first base station receives the calibration signal

After the first base station completes the calibration signal transmission, it needs to complete the switch from transmission to reception before the next receiving window arrives.

The first base station determines the length of a first receiving window according to the network configuration parameters. Wherein, the time interval between the first receiving window starting position and the first sending window starting position is equal to the transceiving calibration time interval Δ t configured by the network. When receiving the calibration signal, the second calibration signal sent by the second base station needs to be received in the first receiving window.

Furthermore, the time interval Δ t between the first receiving window start position and the first transmitting window start position may be smaller than a special time slot but at least one OFDM symbol length, that is, the first base station may sequentially complete the transmission and reception of the calibration signal in the same special time slot; Δ t may also be equal to the sum of several frame structure periods and the switching delay τ, i.e. the first base station transmits and receives calibration signals in different special time slots, respectively.

Furthermore, the length of the first/second sending window, the length of the first/second receiving window and the length of the no-service time interval in the special time slot should satisfy a certain relationship. Assuming that the duration of an OFDM symbol occupied by no service time slot in a special time slot is Tsym, and the uplink and downlink switching delay is τ. When Δ t is smaller than a specific slot but at least one OFDM symbol length, the first/second transmission window length W ₁ First/second receiving window length W ₂ The following configuration should be satisfied: w is more than 0 ₁ ≤W ₂ < Tsym/2, and Δ t-W ₂ ≥τ，△t-W ₁ ≧ τ (consider the calibration signal propagation delay, therefore W ₁ ≤W ₂ (ii) a Considering the time delay of uplink and downlink switching and completing transceiving in the same time slot, therefore W ₂ < Tsym/2); when delta t is equal to the sum of a plurality of frame structure periods and switching time delay, the length W of the first/second sending window ₁ First/second receiving window length W ₂ The following configuration should be satisfied: w is more than 0 ₁ ≤W ₂ < Tsym (consider the calibration signal propagation delay, hence W ₁ ≤W ₂ (ii) a Considering the uplink and downlink handover delays, therefore W ₂ ＜Tsym)

When the calibration signal transmission mode is periodic calibration, the first base station/the second base station can perform periodic transmission/reception of the calibration signal according to a configured period; when the calibration signal transmission mode is triggered calibration, the first base station/the second base station may trigger transmission/reception of the calibration signal when a trigger event satisfies an entry condition, where the trigger event may be that an error rate of the network is higher than a threshold and lasts for a certain time.

(6) Calibration coefficient calculation

The calculation of the calibration coefficients may be performed based on the calibration signals y12, y21 (for example, single antenna transmission) received by the first base station and the second base station in their respective receive windows. The first base station is used as a calibration base station, the calibration coefficient is y21/y12, and the transmission channel of the second base station is multiplied by the calibration coefficient to complete the channel calibration. Here, y21 denotes a first calibration signal transmitted by the first base station and received by the second base station, and y12 denotes a second calibration signal transmitted by the second base station and received by the first base station.

The following describes an embodiment of the present invention with respect to whether the calibration signals are transmitted and received in the same special time slot.

Example 1:

fig. 4 shows an example of the use of periodic calibration, where the calibration signal is transmitted and received in the same special time slot (S). In fig. 4, D denotes a downlink slot, U denotes an uplink slot, S denotes a special slot, and GP denotes a guard interval. The specific process of this example includes:

(1) The first base station and the second base station acquire configuration parameters of a calibration signal configured by a network.

Taking a DDDSU frame structure with subcarrier spacing of 30kHz and 2.5ms as a period as an example, the frame structure includes 3 downlink time slots and 1 uplink time slot, the ratio of the special time slots is 10 (adjustable). In order to send the calibration signal, the network needs to configure relevant parameters, including that the calibration signal sending mode is periodic calibration (calibration signal sending period T1), and the calibration signal sending window W ₁ Calibrating the signal reception window W ₂ The transmit-receive calibration time interval Δ t is one OFDM symbol length. The advantage of the Δ t design is that the calibration of the channel coefficient can be completed only by a single frame structure period, and the efficiency of completing one-time calibration is high.

(2) The first base station transmits a first calibration signal and receives a second calibration signal.

As shown in FIG. 4, the first base station determines to transmit the first base station according to the network configurationLength W of first transmission window of calibration signal ₁ A first receiving window length W for receiving the second calibration signal ₂ 。

When the first calibration signal is transmitted, in the first transmission window W ₁ The calibration signaling is completed.

After the calibration signal is sent, the signal is required to be within the range of delta t-W ₁ The switch from send to receive is completed.

The time interval between the first receiving window starting position and the first sending window starting position is equal to the transceiving calibration time interval delta t configured by the network. When receiving the calibration signal, the calibration signal transmitted by the second base station needs to be received in the first calibration signal receiving window.

(3) The second base station receives the first calibration signal and transmits a second calibration signal.

As shown in fig. 4, the second base station determines the length W of the second receiving window for receiving the first calibration signal according to the network configuration ₂ And W of a second transmission window length for transmitting a second calibration signal ₁ 。

When receiving the first calibration signal, it is required to be in the second receiving window W ₂ And internally receiving a first calibration signal transmitted by the first base station. At this time, the receiving start position of the second receiving window is the same as the first transmitting window start position.

After the first calibration signal is received, the signal is required to be within the range of delta t-W ₂ The handover of the received transmission is completed.

The time interval between the starting position of the second sending window and the starting position of the second receiving window is equal to the transceiving calibration time interval delta t configured by the network. And when the second calibration signal is transmitted, the second calibration signal is transmitted in the second transmission window.

(4) And calculating a calibration coefficient.

The calibration coefficients may be calculated based on the calibration signals y12, y21 (for example, single antenna transmission) received by the first base station and the second base station in the respective receive windows. The first base station is used as a calibration base station, the calibration coefficient is y21/y12, and the transmission channel of the second base station is multiplied by the calibration coefficient to complete channel calibration.

(5) And (5) periodically calibrating.

Interval T ₁ And (4) repeating the calibration processes from (1) to (4). Further, in the next calibration period, the first base station and the second base station adjust the configuration of the calibration signal through network configuration according to the system requirements. If the calibration mode is triggered calibration in the adjustment of the configuration parameters, T ₁ Fail and require configuration of entry and exit conditions and corresponding thresholds for the next trigger calibration. And (4) repeating the steps (2) to (4) after the system meets the condition of triggering calibration entry, and if the system does not meet the condition, not entering the calibration process.

Example 2:

with periodic calibration, the calibration signals are sent and received in different special time slots, as shown in fig. 5.

(1) The first base station and the second base station acquire configuration parameters of calibration signals configured by the network.

Still take the DDDSU frame structure with the subcarrier spacing of 30kHz and 2.5ms as the period of example 1 as an example, the frame structure includes 3 downlink timeslots, 1 uplink timeslot, and the special timeslot ratio is 10 (adjustable). Suppose the uplink and downlink switching time delay is tau.

The network configuration related parameters comprise that the calibration signal sending mode is periodic calibration (the calibration signal sending period T) ₁ ) Calibration signal transmission window W ₁ Calibrating a signal receiving window W ₂ The transmit-receive calibration time interval Δ t is two frame structure periods. The mode has the advantages that the length of the calibration signal can be configured more flexibly, the sending or receiving window can be longer, and the requirement on the time delay of uplink and downlink switching is low.

As shown in fig. 5, the first base station determines the first transmission window length W of the calibration signal according to the network configuration ₁ A first receiving window length W ₂ 。

And when the first calibration signal is transmitted, the first calibration signal is transmitted in the first transmission window.

After the first calibration signal is transmitted, the switch from transmission to reception needs to be completed within τ.

The time interval between the first receiving window starting position and the first sending window starting position is equal to the transceiving calibration time interval delta t configured by the network. When receiving the second calibration signal, the second calibration signal sent by the second base station needs to be received in the first receiving window.

(3) The second base station receives the calibration signal and transmits the calibration signal.

As shown in FIG. 5, the second base station determines the length W of the second receiving window of the calibration signal according to the network configuration ₂ And a second transmission window length W ₁ 。

When receiving the first calibration signal, it is required to be in the second receiving window W ₂ And internally receiving a first calibration signal transmitted by the first base station. At this time, the receiving start position is the same as the first transmitting window start position.

After receiving the first calibration signal, the switch of receiving and transmitting needs to be completed within τ.

(4) And calculating a calibration coefficient.

The calibration coefficients may be calculated based on the calibration signals y12, y21 received by the first base station and the second base station in the respective receive windows (for example, single antenna transmission). The first base station is used as a calibration base station, the calibration coefficient is y21/y12, and the transmission channel of the second base station is multiplied by the calibration coefficient to complete the channel calibration.

(5) And (5) periodically calibrating.

After interval T1, the calibration process of (1) - (4) is repeated. Further, in the next calibration period, the first base station and the second base station adjust the configuration of the calibration signal through network configuration according to the system requirements. If the calibration mode is triggered calibration in the adjustment of the configuration parameters, T ₁ Fail and require configuration of entry and exit conditions and corresponding thresholds that trigger the next calibration. And (4) repeating the steps (2) to (4) after the system meets the condition of triggering calibration entry, and if the system does not meet the condition, not entering the calibration process.

It should be noted that the periodic calibration or triggered calibration is not constant, and can be switched according to the system requirements. For periodic calibration, the calibration period T ₁ The transmit/receive calibration interval Δ t is not constant, and can be switched according to the system condition. E.g. higher subcarrier spacing (30 kHz->120 kHz), the symbol length becomes smaller at this time, which puts higher requirements on uplink and downlink switching delay, so that a larger transceiving calibration interval can be considered, so that transceiving calibration signals of the same base station have a longer time window in different time slots each time of transmitting or receiving, and accurate transceiving of the calibration signals is ensured.

As can be seen from the above examples, in the embodiments of the present invention, the network configuration uses the special time slot to transmit the relevant parameters of the calibration signal, such as the calibration signal transmission mode, the calibration signal transmission window length, the calibration signal reception window length, the transceiving calibration time interval, and the like. The calibration mode comprises periodic calibration or triggered calibration, if the calibration mode is periodic calibration, a calibration signal sending period needs to be configured, and if the calibration mode is triggered calibration, a triggering event entering condition, a triggering event exiting condition and corresponding thresholds need to be configured. In addition, the time interval of the transceiving calibration can be less than a special time slot but at least one OFDM symbol length, that is, the base station can sequentially complete the transmission and the reception of the calibration signal in the same special time slot; Δ t may also be equal to the sum of several frame structure periods and the switching delay, i.e. the base station transmits and receives calibration signals in different special time slots, respectively. The length of the base station sending window, the length of the base station receiving window and the length of the non-service time in the special time slot should satisfy a certain constraint relation. Assuming that the duration of an OFDM symbol occupied by no service time slot in a special time slot is Tsym, and the uplink and downlink switching delay is τ. When the time interval for transmitting and receiving calibration is less than a special time slot but at least one OFDM symbol length, the length of the transmission window W is determined ₁ Length of receiving window W ₂ The following configuration should be satisfied: 0 < W ₁ ≤W ₂ < Tsym/2, and Δ t-W ₂ ≥τ，△t-W ₁ More than or equal to tau; when the transceiver calibration time interval is equal to a plurality of frame structure periodsThe sum of the switching time delays is the length W of the sending window ₁ Length of receiving window W ₂ The following configuration should be satisfied: w is more than 0 ₁ ≤W ₂ < Tsym. In addition, in the embodiment of the invention, the sending and receiving modes of the calibration signal are dynamic, and the sending and receiving configuration parameters of the calibration signal can be selectively adjusted according to the system requirements.

It can be seen from the above description that the calibration process in the embodiment of the present invention can be completed by using a special time slot, and flexible channel calibration can be implemented according to the system requirements by using calibration related parameters configured by a network, thereby effectively improving the system performance of the distributed super-large-scale MIMO.

Various methods of embodiments of the present invention have been described above. An apparatus for carrying out the above method is further provided below.

Referring to fig. 6, an embodiment of the present invention provides a first base station, including:

a transceiver 62 for transmitting a first calibration signal to the second base station within a first transmission window; receiving a second calibration signal sent by a second base station in a first receiving window; wherein the first transmission window and the first reception window are both located within a special time slot.

Optionally, the first base station further includes:

a processor 61, configured to complete preparation for switching from signal transmission to signal reception after transmitting the first calibration signal and before the first reception window arrives.

Preferably, the processor is further configured to calculate a calibration coefficient according to the first calibration signal received by the second base station and the second calibration signal received by the first base station, and perform channel calibration on the base station to be calibrated, where the base station to be calibrated is one of the first base station and the second base station.

Preferably, the transceiver is further configured to acquire configuration parameters of the calibration signal before transmitting the first calibration signal, where the configuration parameters include at least one of the following parameters:

a transmission mode of the first calibration signal, the transmission mode including periodic calibration and/or triggered calibration;

calibrating a trigger event of a signal when the sending mode is triggered calibration;

Preferably, the transmit-receive calibration time interval Δ t ₁ The length of the first sending window and the length of the first receiving window are smaller than the length of a special time slot, and the first sending window and the first receiving window are both positioned in the same special time slot; alternatively, the transmit/receive calibration time interval Δ t ₁ And the first sending window and the first receiving window are respectively positioned in different special time slots.

Preferably, in the case that the first transmission window and the first reception window are both located in the same special time slot, 0 < W ₁ ≤W ₂ < Tsym/2, and Δ t ₁ -W ₂ ≥τ ₁ ，△t ₁ -W ₁ ≥τ ₁ Time interval Δ t for calibration of transmission and reception ₁ Less than the length of a particular slot but not less than the length of an OFDM symbol; in the case that the first transmission window and the first reception window are respectively located in different special time slots, 0 < W ₁ ≤W ₂ < Tsym, transmit-receive calibration time Interval Δ t ₁ Equal to tau ₁ And at least one frame structure period; wherein Tsym represents the duration of an OFDM symbol occupied by a non-service time slot in a special time slot, and tau ₁ Indicating a handover preparation delay from the transmission of the signal of the first base station to the reception.

Preferably, the length of the first transmission window is the same as the length of a second transmission window, and the second transmission window is a time window in which the second base station transmits the second calibration signal; and/or the length of the first receiving window is the same as the length of a second receiving window, and the second receiving window is a time window for the second base station to receive the first calibration signal.

Preferably, the starting position of the first sending window is the same as the starting position of the second receiving window; and/or the starting position of the first receiving window is the same as the starting position of the second sending window.

It should be noted that the apparatus in this embodiment is an apparatus corresponding to the method shown in fig. 2, and the implementation manners in the foregoing embodiments are all applied to the embodiment of the apparatus, and the same technical effects can be achieved. The device provided by the embodiment of the present invention can implement all the method steps implemented by the method embodiment, and can achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as the method embodiment in this embodiment are not repeated herein.

Referring to fig. 7, an embodiment of the present invention provides a structural diagram of a first base station, including: a processor 701, a transceiver 702, a memory 703 and a bus interface, wherein:

in an embodiment of the present invention, the first base station further includes: a program stored on the memory 703 and executable on the processor 701, which when executed by the processor 701, performs the steps of:

transmitting a first calibration signal to a second base station in a first transmission window;

receiving a second calibration signal sent by a second base station in a first receiving window;

It can be understood that, in the embodiment of the present invention, when being executed by the processor 701, the computer program can implement the processes of the method embodiment shown in fig. 2, and can achieve the same technical effect, and in order to avoid repetition, the description is omitted here.

In fig. 7, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 701, and various circuits, represented by memory 703, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 702 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium.

The processor 701 is responsible for managing the bus architecture and general processing, and the memory 703 may store data used by the processor 701 in performing operations.

It should be noted that the apparatus in this embodiment is an apparatus corresponding to the method shown in fig. 2, and the implementation manners in the above embodiments are all applicable to the embodiment of this apparatus, and the same technical effects can be achieved. In the device, the transceiver 702 and the memory 703, and the transceiver 702 and the processor 701 may be communicatively connected through a bus interface, the function of the processor 701 may also be implemented by the transceiver 702, and the function of the transceiver 702 may also be implemented by the processor 701. It should be noted that, the apparatus provided in the embodiment of the present invention can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and detailed descriptions of the same parts and beneficial effects as the method embodiment in this embodiment are omitted here.

In some embodiments of the invention, there is also provided a computer readable storage medium having a program stored thereon, which when executed by a processor, performs the steps of:

transmitting a first calibration signal to the second base station in a first transmission window;

When executed by the processor, the program can implement all the implementation manners in the above-described method for transmitting a calibration signal applied to the first base station side, and can achieve the same technical effect, and is not described herein again to avoid repetition.

An embodiment of the present invention provides a second base station shown in fig. 8, including:

a transceiver 82, configured to receive a first calibration signal transmitted by the first base station within a second receiving window; and transmitting a second calibration signal to the first base station within a second transmission window; and the second receiving window and the second sending window are both positioned in a special time slot.

Here, the second base station may further include:

and the processor 81 is configured to perform and complete the switch preparation of signal reception and transmission after receiving the first calibration signal and before the second transmission window arrives.

Preferably, the processor is further configured to calculate a calibration coefficient according to the first calibration signal received by the second base station and the second calibration signal received by the first base station, and perform channel calibration on a base station to be calibrated, where the base station to be calibrated is one of the first base station and the second base station.

Preferably, the transceiver is further configured to, before receiving the first calibration signal, acquire configuration parameters of the calibration signal, where the configuration parameters include at least one of the following parameters:

a transmit mode of the second calibration signal, the transmit mode comprising periodic calibration and/or triggered calibration;

a length W of the second receive window over which the first calibration signal is received ₄ ；

A length W of the second transmission window over which the second calibration signal is transmitted ₃ ；

And a transceiving time interval delta t2 between the second receiving window and the second sending window.

Preferably, the transmit-receive calibration time interval Δ t ₂ Less than the length of a particular time slot, the second transmission windowAnd the second receiving window are both positioned in the same special time slot; alternatively, the transmit/receive calibration time interval Δ t ₂ And the second sending window and the second receiving window are respectively positioned in different special time slots.

Preferably, in the case that the second transmission window and the second reception window are both located in the same special time slot, 0 < W ₃ ≤W ₄ < Tsym/2, and Δ t ₂ -W ₄ ≥τ ₂ ，△t ₂ -W ₃ ≥τ ₂ Time interval Δ t for calibration of transmission and reception ₂ Less than the length of a particular slot but not less than the length of an OFDM symbol; in the case that the second transmission window and the second reception window are respectively located in different special time slots, W is more than 0 ₃ ≤W ₄ < Tsym, transmit-receive calibration time Interval Δ t ₂ Is equal to tau ₂ And at least one frame structure period; wherein Tsym represents the duration of an OFDM symbol without a traffic segment in a particular slot, τ ₂ Indicating a handover preparation delay for the transceiving of the second base station.

Preferably, the length of the second transmission window is the same as the length of a first transmission window, and the first transmission window is a time window in which the first base station transmits the first calibration signal;

and/or the presence of a gas in the gas,

the length of the second receiving window is the same as the length of a first receiving window, and the first receiving window is a time window for the first base station to receive the second calibration signal.

Preferably, the starting position of the second receiving window is the same as the starting position of the first sending window; and/or the presence of a gas in the gas,

the starting position of the second sending window is the same as the starting position of the first receiving window.

It should be noted that the apparatus in this embodiment is a device corresponding to the method shown in fig. 3, and the implementation manners in the above embodiments are all applicable to the embodiment of this device, and the same technical effects can be achieved. It should be noted that, the apparatus provided in the embodiment of the present invention can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and detailed descriptions of the same parts and beneficial effects as the method embodiment in this embodiment are omitted here.

Referring to fig. 9, an embodiment of the present invention provides a structural diagram of a second base station, including: a processor 901, a transceiver 902, a memory 903, and a bus interface, wherein:

in this embodiment of the present invention, the second base station further includes: a program stored on a memory 903 and executable on a processor 901, which when executed by the processor 901 performs the steps of:

receiving a first calibration signal sent by a first base station in a second receiving window;

transmitting a second calibration signal to the first base station in a second transmission window;

It can be understood that, in the embodiment of the present invention, when the computer program is executed by the processor 901, each process of the method embodiment shown in fig. 3 can be implemented, and the same technical effect can be achieved.

In fig. 9, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 901 and various circuits of memory represented by memory 903 being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 902 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium.

The processor 901 is responsible for managing a bus architecture and general processing, and the memory 903 may store data used by the processor 901 in performing operations.

It should be noted that the terminal in this embodiment is a device corresponding to the method shown in fig. 3, and the implementation manners in the above embodiments are all applicable to the embodiment of the terminal, and the same technical effects can be achieved. In the device, the transceiver 902 and the memory 903, and the transceiver 902 and the processor 901 may be communicatively connected through a bus interface, and the functions of the processor 901 may also be implemented by the transceiver 902, and the functions of the transceiver 902 may also be implemented by the processor 901. It should be noted that, the apparatus provided in the embodiment of the present invention can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and detailed descriptions of the same parts and beneficial effects as the method embodiment in this embodiment are omitted here.

When executed by the processor, the program can implement all the implementation manners in the above-described method for transmitting a calibration signal applied to the second base station, and can achieve the same technical effect, and is not described herein again to avoid repetition.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for transmitting a calibration signal, comprising:

wherein the first transmission window and the first reception window are both located within a special time slot.

2. The method of claim 1, wherein after transmitting the first calibration signal, the method further comprises:

the preparation for switching the signal transmission to reception is completed before the first reception window arrives.

3. The method of claim 1, wherein prior to transmitting the first calibration signal, the method further comprises:

4. The method of claim 3, wherein the configuration parameters further comprise:

when the sending mode is periodic calibration, calibrating the sending period of the signal; alternatively, the first and second electrodes may be,

5. The method of claim 3, further comprising:

6. The method of claim 4,

the transmit-receive calibration time interval Δ t ₁ The length of the first sending window and the length of the first receiving window are smaller than the length of a special time slot, and the first sending window and the first receiving window are both positioned in the same special time slot;

alternatively, the first and second electrodes may be,

7. The method of claim 6,

w is more than 0 under the condition that the first sending window and the first receiving window are both positioned in the same special time slot ₁ ≤W ₂ < Tsym/2, and Δ t ₁ -W ₂ ≥τ ₁ ，△t ₁ -W ₁ ≥τ ₁ Time interval Δ t for calibration of transmission and reception ₁ Less than the length of a particular time slot, butNot less than one OFDM symbol length;

in the case that the first transmission window and the first reception window are respectively located in different special time slots, 0 < W ₁ ≤W ₂ < Tsym, transmit-receive calibration time Interval Δ t ₁ Is equal to tau ₁ And at least one frame structure period;

8. The method of claim 3,

the length of the first transmission window is the same as that of a second transmission window, and the second transmission window is a time window for the second base station to transmit the second calibration signal;

and/or the presence of a gas in the atmosphere,

9. The method of claim 8,

the starting position of the first sending window is the same as that of the second receiving window; and/or the presence of a gas in the gas,

10. A first base station, comprising:

11. The first base station of claim 10, further comprising:

and the processor is used for finishing the preparation of switching from signal transmission to signal reception before the first receiving window is reached after the first calibration signal is transmitted.

12. The first base station of claim 10,

the transceiver is further configured to acquire configuration parameters of the calibration signal before transmitting the first calibration signal, where the configuration parameters include at least one of:

13. A first base station, comprising: processor, memory and program stored on the memory and executable on the processor, which when executed by the processor implements the steps of the method according to any one of claims 1 to 9.

14. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 9.