WO2020154923A1

WO2020154923A1 - Drs sending method and apparatus

Info

Publication number: WO2020154923A1
Application number: PCT/CN2019/073781
Authority: WO
Inventors: 任占阳; 贾树葱
Original assignee: 华为技术有限公司
Priority date: 2019-01-29
Filing date: 2019-01-29
Publication date: 2020-08-06
Also published as: CN113330812A; CN113330812B

Abstract

Provided in the embodiments of the present application are a DRS transmission method and apparatus, which relate to the communication field and increase the sending opportunities of measurement reference signals in an unlicensed spectrum so as to improve the efficiency of beam management. The method specifically comprises: a network device performing carrier sensing, determining that a carrier is idle, and acquiring an MCOT in a DMTC; in the MCOT, using an idle carrier to send a first signal of a target beam, wherein the first signal comprises a DRS sent to the target beam and a measurement reference signal sent to N beams.

Description

A DRS sending method and device

Technical field

This application relates to the field of communications, and in particular to a method and device for sending a discovery signal (DRS).

Background technique

Spectrum resources in wireless communication are divided into licensed spectrum and unlicensed spectrum (also called unlicensed spectrum). Due to its shared characteristic, the unlicensed spectrum follows the listen before talk (LBT) channel access mechanism. LBT refers to detecting the channel state before sending a signal, and avoiding it if other devices are using the channel, and if the channel is idle, sending data within the maximum channel occupancy time (MCOT) on the channel.

At present, Long Term Evolution (LTE) technology has been applied to unlicensed spectrum to provide high-performance communication services. With the development of technology, the 5th generation mobile communication technology (5G) new radio (NR) NR communication technology will also be applied to unlicensed spectrum to provide users with higher-performance services.

5G uses a higher carrier frequency to achieve greater bandwidth and higher transmission rate wireless communication. In order to solve the severe fading caused by high frequency, 5G uses beamforming (BF) technology to obtain a beam with good directivity for sending and receiving data, so as to increase the power in the transmitting direction and improve the receiving end. Signal to interference and noise ratio (signal to interference plus noise ratio, SINR). Since both network equipment and terminal equipment use narrower beams for communication, better communication quality can be obtained only when the transmitting beam and the receiving beam are aligned.

Perform beam management by sending measurement reference signals to determine whether the sending beam and the receiving beam are used to obtain better communication quality. A beam management method in 5G NR is to configure terminal-level channel state information reference signals (CSI-RS) for the terminal, including the CSI-RS transmission time, the number of transmissions (that is, the number of transmitted beams), and CSI-RS. RS resource mapping location. The above configuration may be periodic or aperiodic. The periodic configuration does not need to be notified to the terminal before each CSI-RS transmission, and the aperiodic configuration needs to be notified to the terminal before each CSI-RS transmission. The network device sends the CSI-RS as the measurement reference signal according to the configuration, and the terminal performs the measurement according to the configuration, and determines the beam pair according to the measurement result. The beam pair refers to the combination of the network device sending beam and the terminal receiving beam.

If the 5GNR beam management method is used in the unlicensed spectrum, because the network device in the unlicensed spectrum performs LBT before sending signals, there are two problems. On the one hand, since the success of LBT cannot be estimated, the unlicensed spectrum cannot be used to periodically send measurement reference signals. On the other hand, if the non-periodic terminal-level measurement reference signal is configured, the network device LBT obtains an MCOT after the success. The MCOT not only informs the terminal to measure but also sends the measurement reference signal, the terminal needs a certain time to receive and decode the measurement reference signal , The limited MCOT measurement reference signal transmission opportunities of different beams are insufficient, and LBT is not always successful, resulting in low beam management efficiency in the unlicensed spectrum.

Summary of the invention

The embodiments of the present application provide a DRS transmission method and device, which increase the transmission opportunity of measurement reference signals in the unlicensed spectrum, so as to improve the efficiency of beam management.

In order to achieve the foregoing objectives, the embodiments of the present application adopt the following technical solutions:

In a first aspect, a method for sending measurement reference signals is provided. The method may include: a network device performs carrier sensing, determines that the carrier is idle, and obtains MCOT in the discovery measurement timing configuration (DMTC); The MCOT uses an idle carrier to transmit the first signal of the target beam, and the first signal includes the DRS sent to the target beam and M measurement reference signals sent to the N beams. Alternatively, the network device uses an idle carrier in the MCOT, sends the DRS of the target beam in the target beam, and sends M measurement reference signals in the N beams.

Among them, DRS is used to discover network equipment; the target beam is any transmission beam that does not send DRS among all the transmission beams configured by the network equipment; N is greater than or equal to 1, and the measurement reference signal is used to measure the beam quality; N beams are all transmissions Part or all of the beams, or N beams are part or all of the multiple sub-beams divided by the target beam. M is greater than or equal to N.

With the DRS sending method provided in this application, since DMTC is a periodic window configured for DRS, and the duration of DMTC is greater than the duration of DRS, network equipment can perform LBT for a period of time before DMTC and within DMTC, increasing the DRS Transmission opportunities, and the transmission opportunities of measurement reference signals sent by DRS will also increase, which greatly improves the efficiency of beam management. In addition, after the terminal receives the DRS, it can receive the measurement reference signal without the network device notifying the terminal of the configuration of the measurement reference signal, which also improves the efficiency of beam management.

Among them, the network device can perform carrier sensing for a period of time before the DMTC and within the DMTC. This application does not specifically limit the time domain position of the carrier sensing, and can be configured according to actual needs.

Specifically, the content of the DRS can be configured according to actual needs, which is not specifically limited in the embodiment of the present application. For example, DRS can include primary synchronization signal (PSS), secondary synchronization signal (SSS), physical broadcast channel (PBCH), physical downlink control channel (PDCCH) And physical downlink shared channel (physical downlink shared channel, PDSCH).

It should be noted that the DRS is only a name for the signal sent by the network device for the terminal device to discover the network device, and does not limit the type of the signal sent by the network device for the terminal device to discover the network device. In actual applications, all signals sent by network devices for terminal devices to discover network devices are referred to as DRS in this application.

It should be noted that the DMTC is only a name for the periodic DRS sending opportunity window, and is not a limitation on the type of the periodic DRS sending opportunity window. In practical applications, all periodic DRS sending opportunity windows are referred to as DMTCs in this application.

With reference to the first aspect, in a possible implementation manner, the DRS sending method provided by this application may further include: if there are beams that have not sent DRS among all the sending beams, and the DMTC meets the first preset condition, and When the MCOT meets the second preset condition, the network device switches the target beam, and re-executes sending the first signal of the target beam by using an idle carrier in the MCOT. Or, the network device switches the target beam, and re-executes the DRS of sending the target beam on the target beam using the idle carrier in the MCOT and sending the measurement reference signals of the N beams. Until the MCOT does not meet the second preset condition, the network device performs carrier sensing again, determines that the carrier is idle, acquires the MCOT in the DMTC, the network device switches the target beam, and executes the MCOT to use the idle carrier to send the first signal of the target beam. Or, the network device re-executes carrier sensing, determines that the carrier is idle, acquires MCOT in DMTC, switches the target beam, executes the DRS of sending the target beam on the target beam using the idle carrier in the MCOT, and sends the measurement reference of N beams signal. Until the DMTC does not meet the first preset condition, the entire process ends.

Among them, switching the target beam by the network device refers to switching the target beam to another transmitting beam that does not transmit DRS.

With reference to the first aspect or any of the foregoing possible implementation manners, in a possible implementation manner, the power of the DRS and the measurement reference signal may be the same or different, which is not specifically limited in this application.

With reference to the first aspect or any of the foregoing possible implementation manners, in a possible implementation manner, N may be equal to 1, that is, the directions of the N beams are the same. The N beams may be the same beam or different beams, which is not specifically limited in this application.

With reference to the first aspect or any of the foregoing possible implementation manners, in a possible implementation manner, at least one measurement reference signal may be sent on one beam.

With reference to the first aspect or any of the foregoing possible implementation manners, in a possible implementation manner, N=1, and the beam is the target beam. It can be understood that the first signal includes the DRS sent to the target beam and M measurement reference signals sent to the target beam. Or, after sending the DRS of the target beam, M measurement reference signals are sent in the target beam, which greatly increases the chance of sending the measurement reference signals.

In combination with the first aspect or any of the foregoing possible implementation manners, in one possible implementation manner, there is no symbol interval between the DRS of the target beam and the M measurement reference signals, and two consecutive measurement reference signals are There is no symbol interval between measurement reference signals. In a wireless communication system, such as NR, a wireless frame has a length of 10 milliseconds (millisecond, ms), including 10 subframes of 1 ms. Each subframe contains 14*n symbols. The value of n depends on the subcarrier spacing. For 15 kilohertz (kilohertz, kHz) subcarrier spacing, n=1; for 30kHz subcarrier spacing, n=2; for 60kHz subcarrier spacing, n=4; for 120kHz subcarrier spacing Carrier spacing, n=8 and so on. Different communication systems may choose to use different subcarrier intervals and correspond to different radio frame time domain structures, which are not specifically limited in this application.

With reference to the first aspect or any of the foregoing possible implementation manners, in a possible implementation manner, N may be the number of all transmit beams configured by the network device.

With reference to the first aspect or any of the foregoing possible implementation manners, in a possible implementation manner, N is the larger value of the number of all the transmission beams and the number of measurement reference signals that the MCOT supports for transmission. Wherein, the number of measurement reference signals that the MCOT supports to send refers to the number of measurement reference signals that the current MCOT supports to send.

In combination with the first aspect or any of the foregoing possible implementation manners, in a possible implementation manner, N beams are randomly selected N beams among all transmission beams; or, N beams are all transmission beams according to N beams selected in a preset order; or, N beams are N beams selected in order of use frequency among all transmission beams.

In practical applications, the value of N can be determined according to actual requirements. The larger the value of N, the more opportunities for sending measurement reference signals and the higher efficiency of beam management.

With reference to the first aspect or any of the foregoing possible implementation manners, in a possible implementation manner, the DRS transmission method provided in this application may further include: if there is still a DRS that has not been transmitted among all the transmission beams configured by the network device Beam, and the DMTC meets the first preset condition, and the MCOT does not meet the second preset condition, re-execute the network device to perform carrier sensing, determine that the carrier is idle, and obtain the MCOT in the DMTC.

With reference to the first aspect or any of the foregoing possible implementation manners, in a possible implementation manner, the first preset condition may include: the DMTC is not over, or the remaining duration of the DMTC is greater than or equal to the preset threshold. The second preset condition may include: the number of remaining symbols of the MCOT is greater than the number of X first signals or the number of symbols occupied by the DRS; X is greater than or equal to 1.

With reference to the first aspect or any of the foregoing possible implementation manners, in a possible implementation manner, the first signal may further include indication information; the indication information is used to indicate the first signal of the measurement reference signal included in the first signal A feature; wherein, the first feature may include one or more of the following: generating the initial value of the pseudo-random sequence of the measurement reference signal, the pseudo-random sequence initialization method used by the measurement reference signal, and the amount occupied by a single measurement reference signal The number of symbols, the duration of a single measurement reference signal, the value of N, the value of M, the mapping position of the measurement reference signal in the carrier, and the power of the measurement reference signal. Wherein, each item in the above characteristics may be a fixed value, or may be a non-fixed value having a specific relationship with the first signal transmission time, frequency domain, etc.

With reference to the first aspect or any of the foregoing possible implementation manners, in a possible implementation manner, the DRS may also include indication information; the indication information is used to indicate the first characteristic of the measurement reference signal sent immediately following the DRS .

In combination with the first aspect or any of the foregoing possible implementation manners, in a possible implementation manner, the first signal, DRS, PDCCH, PDSCH, and other downlink signals or channels may carry data sent immediately following the DRS within a specific time period. The second feature of the measurement reference signal.

Among them, the second feature of the measurement reference signal may include, but is not limited to: the number of measurement reference signals, the beam, the relationship with the target beam, the pseudo-random sequence initialization method used for the measurement reference signal, the number of symbols occupied by a single measurement reference signal, The duration of a single measurement reference signal, the mapping position of the measurement reference signal in the carrier, and the measurement of the power of the reference signal.

With reference to the first aspect or any of the foregoing possible implementation manners, in a possible implementation manner, the measurement reference signal may include: a signal generated based on a pseudo-random sequence; wherein the pseudo-random sequence includes a Gold sequence, or ZC Sequence, or M sequence.

In a second aspect, a DRS receiving method is provided. The method may include: a terminal receives the DRS; determining a symbol for transmitting a measurement reference signal; using different receiving beams or the same receiving beam, and receiving a measurement reference signal on the symbol for determining the transmission of the measurement reference signal. Among them, the measurement reference signal is used to measure the beam quality for beam management.

The DRS may be the DRS of the target beam described in the first aspect above, and the DRS may be sent separately or included in the first signal transmission. The terminal knows the time-domain position relationship between the DRS and the measurement reference signal. When receiving the DRS, the terminal can determine the symbol for transmitting the measurement reference signal according to the time-domain position relationship. The terminal knows the characteristics of the measurement reference signal followed by the DRS, such as the number of measurement reference signals, the corresponding network equipment transmission beam and other information. Based on these information, the terminal uses different receiving beams or the same receiving beam, and determines the transmission measurement reference signal. The symbol receives the measurement reference signal and can perform channel quality measurement (or estimation) of each beam pair according to the received measurement reference signal.

Based on the above-mentioned channel quality measurement (or estimation), the terminal device can measure, update, and predict the first channel quality index. The first channel quality index includes the carrier to interference and noise ratio (CINR) of each beam pair. , Signal to Interference and Noise Ratio (SINR), Received Signal Strength Indicator (RSSI), Reference Signal Received Power (RSRP), Reference Signal Received Quality (reference signal received quality (RSRQ) instantaneous average or time average of the signal quality measurement, instantaneous variance or time variance of the RSRQ signal quality measurement, and instantaneous standard deviation or time standard deviation of the RSRQ signal quality measurement.

Among them, the time domain position of the DRS and the measurement reference signal known by the terminal refers to the channel that the terminal has received before receiving the DRS indicating the first feature or the second feature of the measurement reference signal sent by the DRS within a specific time period. Or signal, or refers to the time domain position information of the DRS and the measurement reference signal that the terminal decodes from the DRS when receiving the DRS this time.

In a third aspect, a DRS sending device is provided, which may include a listening unit, a processing unit, and a sending unit; wherein the listening unit is used to perform carrier sensing, determine that the carrier is idle, and obtain MCOT from the DMTC; In the MCOT, the listening unit is used to determine the idle carrier, and the first signal of the target beam is sent through the sending unit, the first signal includes the DRS sent to the target beam and M measurement reference signals sent to the N beams; or, The processing unit is configured to use the listening unit in the MCOT to determine the idle carrier, and through the sending unit, send the DRS of the target beam in the target beam, and send M measurement reference signals in the N beams;

Among them, DRS is used to discover the network device where the DRS sending device is located; the target beam is any one of all the sending beams configured by the network device that does not send DRS; N is greater than or equal to 1, and the measurement reference signal is used to measure the beam quality; N The two beams are part or all of all the transmission beams configured by the network device, or the N beams are part or all of the multiple sub-beams divided by the target beam. M is greater than or equal to N.

With the DRS sending device provided in this application, since DMTC is a periodic window configured for DRS, and the duration of DMTC is greater than the duration of DRS, network equipment can perform LBT for a period of time before DMTC and within DMTC, which increases the DRS Transmission opportunities, and the transmission opportunities of measurement reference signals sent by DRS will also increase, which greatly improves the efficiency of beam management. In addition, after the terminal receives the DRS, it can receive the measurement reference signal without the network device notifying the terminal of the configuration of the measurement reference signal, which also improves the efficiency of beam management.

It should be noted that the DRS sending device provided in the third aspect of this application is used to execute the DRS sending method provided in the first aspect or any one of the possible implementations. For specific implementation, refer to the first aspect or any one of the above The possible implementation methods will not be repeated here.

In a fourth aspect, the present application provides a DRS sending device, which can implement the functions of the network device in the foregoing method example, and the function can be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the aforementioned functions.

With reference to the fourth aspect, in a possible implementation manner, the structure of the DRS sending apparatus includes a processor and a transceiver, and the processor is configured to support the DRS sending apparatus to perform corresponding functions in the foregoing method. The transceiver is used to support communication between the DRS sending device and other devices. The DRS sending device may further include a memory, which is used for coupling with the processor, and stores the necessary program instructions and data of the DRS sending device.

In a fifth aspect, this application provides a network device, which includes the DRS sending device described in any one of the foregoing aspects or any possible implementation manners for performing the function of the network device in the method example.

In a sixth aspect, a DRS receiving device is provided. The device may include a receiving unit and a processing unit. Among them, the receiving unit is used to receive DRS; the processing unit is used to determine the symbol for transmitting the measurement reference signal, and the receiving unit uses different receiving beams or the same receiving beam to receive the measurement reference signal on the symbol for transmitting the measurement reference signal. Among them, the measurement reference signal is used to measure the beam quality for beam management.

In a seventh aspect, the present application provides a DRS receiving device, which can implement the functions of the terminal in the foregoing method examples, and the functions can be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the aforementioned functions.

With reference to the seventh aspect, in a possible implementation manner, the structure of the DRS receiving apparatus includes a processor and a transceiver, and the processor is configured to support the DRS receiving apparatus to perform corresponding functions in the foregoing method. The transceiver is used to support communication between the DRS receiving device and other devices. The DRS receiving device may also include a memory, which is used for coupling with the processor and stores the necessary program instructions and data of the DRS device.

In an eighth aspect, this application provides a terminal, which includes the DRS receiving device described in any one of the foregoing aspects or any possible implementation manners for performing the terminal functions in the method example.

In the ninth aspect, the embodiments of the present application provide a communication system, including the network device described in any one of the foregoing aspects or any possible implementation manner, and one or more of the foregoing any aspect or any one possible implementation manner. Terminal.

In a tenth aspect, an embodiment of the present application provides a computer storage medium for storing computer software instructions used for the above-mentioned network equipment or terminal, which includes a program for executing any one of the above-mentioned aspects.

In an eleventh aspect, a computer program product containing instructions is provided, which when the instructions run on a computer, cause the computer to execute the method described in any of the foregoing aspects.

The solutions provided by the second aspect to the eleventh aspect described above are used to implement the methods provided by the first aspect or the second aspect or any one of the possible implementation manners, so the same beneficial effects can be achieved with them, and will not be performed here. Repeat.

Description of the drawings

FIG. 1A is a schematic diagram of a carrier sensing scenario provided by the prior art;

Figure 1 is a schematic diagram of the internal structure of a DRS provided in the prior art;

FIG. 2 is a schematic diagram of the time domain structure of a DMTC window provided by the prior art;

3 is a schematic diagram of an unlicensed spectrum wireless communication system architecture provided by an embodiment of the application;

FIG. 4 is a schematic structural diagram of a network device provided by an embodiment of this application;

FIG. 5 is a schematic structural diagram of a terminal provided by an embodiment of this application;

FIG. 6 is a schematic flowchart of a method for sending DRS according to an embodiment of this application;

FIG. 7 is a schematic diagram of a scenario in which a network device sends a DRS according to an embodiment of the application;

FIG. 8 is a schematic diagram of another scenario where a network device sends a DRS according to an embodiment of the application;

FIG. 9 is a schematic diagram of another scenario where a network device sends a DRS according to an embodiment of the application;

FIG. 10 is a schematic diagram of another scenario where a network device sends a DRS according to an embodiment of this application;

FIG. 11 is a schematic structural diagram of a DRS sending apparatus provided by an embodiment of this application;

FIG. 12 is a schematic structural diagram of another DRS sending apparatus provided by an embodiment of this application;

FIG. 13 is a schematic structural diagram of a DRS receiving apparatus provided by an embodiment of this application;

FIG. 14 is a schematic structural diagram of another DRS receiving apparatus provided by an embodiment of this application.

detailed description

Before describing the embodiments of the present application, the terms involved in the embodiments of the present application are explained here.

LBT means that a device that needs to transmit data needs to detect the wireless environment of a wireless carrier before sending data on a certain wireless carrier to determine whether other devices are transmitting data. LBT may also be called channel sensing, clear channel assessment (CCA) or carrier sensing (CS).

The LBT in the energy detection mode means that when it detects that the energy on the wireless carrier is greater than the threshold, it is considered that other devices are transmitting data, and the device will try to send data after a period of time; when the energy on the wireless carrier is detected When it is less than the threshold, the wireless carrier is considered to be in an idle state, and the device sends data on the wireless carrier.

LBT in the signal detection mode refers to determining whether the channel is idle by detecting whether there is a pre-designed signal on the wireless carrier.

In addition, in the embodiment of the present invention, the LBT may also be other modes of LBT, for example, the LBT that uses factors such as signal power or signal-to-noise ratio as a standard. The carrier in the idle state described below may mean that the energy on the channel is detected to be less than the energy threshold, or it may mean that the pre-designed signal on the channel is not detected, which is not limited here. The following description of the wireless carrier not being in an idle state may mean detecting that the energy on the channel is greater than or equal to the energy threshold, or detecting that a pre-designed signal is present on the channel, which is not limited here.

The 3rd generation partnership project (3GPP) has evaluated four types of LBT mechanisms in the study of licensed spectrum assisted access (LAA), including:

Type 1: No LBT, that is, the device does not perform LBT before sending data.

Type 2: LBT without random backoff process, that is, LBT with a fixed length of time. Use fixed-length frames, including channel occupation time and idle time. Carrier sensing is performed before data transmission. If the channel is in an idle state, data transmission is performed during the subsequent channel occupation time; otherwise, data cannot be transmitted during the entire frame period. For the convenience of description, hereinafter referred to as Category-2LBT.

Type 3: LBT with random backoff process, and the length of the contention window is fixed. If the channel is in an idle state, data transmission can start immediately, otherwise, it enters the contention window (CW) for short as Category-3LBT hereinafter.

Type 4: LBT with random backoff process, and the length of the contention window is not fixed. Unlike the use of a fixed-length contention window, the sender device can change the length of the CW. For the convenience of description, hereinafter referred to as Category-4 LBT.

Random backoff means that if the channel is still in the idle state within the waiting time after the device detects that the channel is in the idle state, the device can transmit data on the channel.

Optionally, the carrier sense can be Category-2LBT, Categorty-3LBT or Category-4LBT.

After the unlicensed spectrum channel is accessed, the duration of signal transmission using the channel is limited by the maximum channel occupation time MCOT. The MCOT of Category-2LBT is small, usually 1 millisecond (millisecond, ms). The MCOT of Category-4LBT is larger, and the higher the service priority of channel access, the smaller the MCOT of Category-4LBT.

MCOT, due to the characteristics of unlicensed spectrum sharing, after accessing the channel, the channel cannot be occupied all the time, but there is a maximum channel occupation time MCOT limitation. The duration of the MCOT can be configured according to actual needs, which is not specifically limited in the embodiment of the present application.

The following briefly describes the specific implementation of carrier sensing (also called channel sensing).

In a possible implementation, the network device performs omnidirectional carrier sensing in the first time period. Omnidirectional carrier sensing means that in the process of carrier sensing, the network equipment does not distinguish which signal is received from the beam range of the receiving beam of the network equipment, that is, carrier sensing is performed in all signal arrival directions.

In a possible implementation, the network device uses the omnidirectional receiving antenna to perform omnidirectional carrier sensing in the first time period.

In a possible implementation, the network device performs directional carrier sensing in the first time period. Directed carrier sensing means that the network equipment only listens to signals within a specific receiving beam range during the carrier sensing process, that is, the network equipment can listen to whether other devices occupy the channel within the specific receiving beam range.

In a possible implementation, the network device uses the directional receiving antenna to perform directional carrier sensing in the first time period. Or, the network device uses the receive beamforming technology to perform directional carrier sensing in the first time period.

In a possible implementation, the network device performs directional carrier sensing for the first receiving beam in the first time period. If the network device detects that the channel is in an idle state, the network device performs MCOT after the first time period. The signals of the H transmission beams are continuously transmitted within, the beam range of the first reception beam includes the beam ranges of the foregoing H transmission beams, and H is a positive integer greater than or equal to 1.

For example, the network device is configured with 16 transmission beams, and the network device needs to transmit signals of 3 transmission beams among the 16 transmission beams mentioned above. The 3 transmission beams are the first transmission beam among the 16 transmission beams. , The second transmit beam and the third transmit beam. The network equipment performs directional carrier sensing for the first receive beam in the first time period. As shown in FIG. 1A, a carrier sensing scenario is shown. The beam range of the first receive beam includes the first The beam range of the transmission beam, the beam range of the second transmission beam, and the beam range of the third transmission beam. If the network device detects that the channel within the beam range of the first receive beam is idle, the network device continuously transmits the signal of the first transmit beam and the signal of the second transmit beam in the MCOT after the first time period And the signal of the third transmit beam mentioned above.

It should be noted that the beam range of the receiving beam of the network device refers to the signal receiving direction range where the network device has a higher receiving antenna gain. As shown in FIG. 1A, taking the beam direction in the horizontal direction as an example, assume that the due east direction is 0 degrees, the due north direction is 90 degrees, the due west direction is 180 degrees, and the due south direction is 270 degrees. If the network device receives a signal arriving in the true east direction through a receiving beam, the receiving beam direction is called 0 degrees. If the receiving antenna gain of the first receiving beam of the network device is greater than the first preset gain value within the range of the receiving beam direction of 0 degrees to the receiving beam direction of 60 degrees, the beam range of the first receiving beam is called 0 degrees. Receiving beam direction to 60 degrees receiving beam direction. In the same way, it can be known that the beam range of the transmission beam of the network device refers to the signal transmission direction range where the network device has a higher transmit antenna gain. If the network device transmits a signal in the due east direction through the transmitting beam, the direction of the transmitting beam is called 0 degree. If the transmit antenna gain of the first transmit beam of the network device is greater than the second preset gain value within the range of the transmit beam direction of 10 degrees to the transmit beam direction of 50 degrees, the beam range of the first transmit beam is called 10 degrees. The transmit beam direction to 50 degrees of the transmit beam direction. In addition, the beam range of the first receiving beam includes the beam range of the first transmitting beam. For example, the first preset gain value is 10dBi, and the second preset gain value is 10dBi.

Beam management means that in a communication system using BF technology, the network device sends the measurement reference signal on the configured transmit beam, and the terminal side receives the measurement reference signal on the configured receive beam, and selects one or more beam pairs with good quality as the follow-up The transmit beam and receive beam used for communication.

The time domain structure of a wireless frame. In a wireless communication system, a wireless frame has a length of 10ms, including 10 subframes of 1ms. Each subframe contains 14*n symbols. The value of n depends on the subcarrier spacing, for 15kHz subcarrier spacing, n=1; for 30kHz subcarrier spacing, n=2; for 60kHz subcarrier spacing, n=4; for 120kHz subcarrier spacing, n=8, etc. Wait. Different communication systems can choose to use different subcarrier intervals, corresponding to different radio frame time domain structures. The solutions provided in the embodiments of the present application can be applied to communication systems with various subcarrier intervals.

DRS, a signal used by the receiver to discover the sender. The network device sends the DRS to enable the terminal to discover the network device.

Figure 1 illustrates the internal structure of a DRS. As shown in Figure 1, the DRS can include PSS, SSS, PBCH, PDCCH, and PDSCH. The PBCH, PDCCH, and PDSCH in the DRS carry the cell system information of the cell served by the network device, and the terminal can obtain the basic system configuration information of the network device by receiving the DRS.

Among them, the function of PSS and SSS is that the terminal can discover the network device and enable the terminal to establish frequency domain and time domain synchronization with the network device. When the terminal is turned on, it needs to perform cell search for searching for PSS and SSS signals in the frequency domain where PSS and SSS are likely to occur. The terminal not only needs to search for a cell when it is turned on, but in order to support mobility, the terminal will constantly search for neighboring cells, obtain synchronization, and estimate the signal reception quality of the cell, thereby deciding whether to perform handover or cell reselection. After the terminal synchronizes with the network equipment, the terminal obtains the system information of the cell according to other channels in the DRS to learn how the cell is configured to access the cell and work correctly in the cell. The specific process is in this article No longer.

DMTC: In the unlicensed spectrum, a DMTC window is configured for the DRS signal, and it is stipulated that within the DMTC window, the network device sends DRS first. The DMTC window has a specific duration and a specific period. Since the duration of the DMTC window is greater than the DRS duration, multiple LBT can be performed before and within the DMTC window, and after the LBT is successful, the MCOT is obtained to send the DRS, which increases the chance of sending the DRS. Figure 2 illustrates the time domain structure of the DMTC window.

Network equipment refers to equipment on the network side that is used to send wireless signals to and receive wireless signals from the terminal. For example, the network device may be an access network device, or a transmission reception point (TRP).

Since technologies in the field of wireless communication are usually applied to unlicensed spectrum to provide high-performance services to users of unlicensed spectrum, when 5G NR technology is introduced into unlicensed spectrum, it is necessary to solve how to transmit in unlicensed spectrum Measure the reference signal for beam management.

Based on this, this application proposes a DRS transmission method for efficient beam management in unlicensed spectrum. The basic principle is: based on the DMTC configured in the unlicensed spectrum to send DRS preferentially, the measurement reference signal is followed by the DRS. Send to improve the sending opportunity of measurement reference signal and improve the efficiency of beam management in unlicensed spectrum.

The service transmission method provided in this application is applied to the wireless communication system architecture of the unlicensed spectrum as shown in FIG. 3. As shown in FIG. 3, the wireless communication system architecture includes at least one network device 301, and a terminal 302 that communicates with the network device 301.

It should be noted that FIG. 3 is only a schematic diagram of the wireless communication system architecture by way of example. The number of network devices 301, the types of network devices 301, the number of terminals 302, the types of terminals 302, etc. included in the wireless communication system architecture can all be configured according to actual needs. FIG. 3 is not a specific limitation on this content.

The network devices described in this application are part or all of the access network devices that provide communication services for terminals in the wireless communication system. When the network equipment is part of the access network equipment, it can be called TRP. In wireless communication systems of different standards, the access network devices may have different names, but they can all be understood as the access network devices described in this application. The embodiment of the present application also does not specifically limit the type of the access network device. For example, the access network equipment in the Universal Mobile Telecommunications System (UMTS) is called a base station (BS); the access network equipment in the LTE system is called an evolved Node B, eNB) and so on, which will not be listed here. Any network device that provides communication services for terminals in a wireless communication system can be understood as the access network device described in this application.

The terminal described in this application is the mobile communication device used by the user. The terminal can be a mobile phone, a tablet computer, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a personal digital assistant (PDA), an e-book, a mobile TV, a wearable device, a personal computer ( Personal Computer, PC) and so on. In communication systems of different standards, terminals may have different names, but they can all be understood as the terminals described in this application. The embodiment of the present application also does not specifically limit the type of the terminal.

The terms "first" and "second" in the description and claims of the embodiments of the present application are used to distinguish different objects, rather than to describe a specific order of objects. For example, the first base station and the second base station are used to distinguish different base stations, rather than to describe a specific sequence of devices.

In the embodiments of the present application, words such as "exemplary" or "for example" are used as examples, illustrations, or illustrations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferable or advantageous than other embodiments or design solutions. To be precise, words such as "exemplary" or "for example" are used to present related concepts in a specific manner to facilitate understanding.

One or more of A, B, and C described in the embodiments of this application are used to represent the following concepts: A, or B, or C, or A and B, or A and C, or B And C, or A, B, and C.

The embodiments of the present application will be described in detail below in conjunction with the drawings.

On the one hand, an embodiment of the present application provides a network device. FIG. 4 shows a network device 40 related to the embodiments of the present application. The network device 40 may be the network device 301 in the wireless communication system architecture shown in FIG. 3. As shown in FIG. 4, the network device 40 may include: a processor 401, a memory 402, and a transceiver 403.

In the following, each component of the network device 40 is specifically introduced in conjunction with FIG. 4:

The memory 402 may be a volatile memory (volatile memory), such as a random-access memory (random-access memory, RAM); or a non-volatile memory (non-volatile memory), such as a read-only memory (read-only memory). , ROM), flash memory (flash memory), hard disk (hard disk drive, HDD) or solid-state drive (solid-state drive, SSD); or a combination of the above types of memory for storing programs that can implement the method of this application Code, and configuration files.

The processor 401 is the control center of the network device 40, and can be a central processing unit (CPU), or a specific integrated circuit (Application Specific Integrated Circuit, ASIC), or is configured to implement the embodiments of this application One or more integrated circuits, such as: one or more microprocessors (digital singnal processors, DSP), or one or more field programmable gate arrays (Field Programmable Gate Array, FPGA). The processor 401 may execute various functions of the network device 40 by running or executing software programs and/or modules stored in the memory 402, and calling data stored in the memory 402.

The transceiver 403 is used for the network device 40 to interact with other units. Exemplarily, the transceiver 403 may be a transceiver antenna of the network device 40.

Specifically, the processor 401 executes the following functions by running or executing software programs and/or modules stored in the memory 402, and calling data stored in the memory 402:

Carrier sense, determine that the carrier is idle, and obtain MCOT in DMTC; use the carrier to send the first signal of the target beam in MCOT, the first signal includes the DRS sent to the target beam and M measurement references sent to N beams Signal; or, use the carrier in MCOT, send DRS in the target beam and send M measurement reference signals in N beams.

Among them, DRS is used to discover network equipment; the target beam is any transmission beam that does not transmit DRS among all the transmission beams configured by the network equipment; N is greater than or equal to 1, and the measurement reference signal is used to measure beam quality for beam management; N beams Is part or all of all transmission beams, or N beams are part or all of multiple sub-beams divided by the target beam. M is greater than or equal to N.

On the other hand, an embodiment of the present application provides a terminal. FIG. 5 shows a terminal 50 related to various embodiments of the present application. The terminal 50 may be the terminal 302 in the wireless communication system architecture shown in FIG. 3. As shown in FIG. 5, the terminal 50 may include: a processor 501, a memory 502, and a transceiver 503.

The following specifically introduces each component of the terminal 50 in conjunction with FIG. 5:

The memory 502 may be a volatile memory, such as RAM; or a non-volatile memory, such as ROM, flash memory, HDD or SSD; or a combination of the above types of memory, used to store program codes that can implement the method of the present application, and Configuration file.

The processor 501 is the control center of the terminal 50, and can be a CPU, an ASIC, or one or more integrated circuits configured to implement the embodiments of the present application, such as one or more DSPs, or, one or Multiple FPGAs. The processor 501 may execute various functions of the terminal 50 by running or executing software programs and/or modules stored in the memory 502, and calling data stored in the memory 502.

The transceiver 503 is used for the terminal 50 to interact with other units. Exemplarily, the transceiver 503 may be a transceiver antenna of the terminal 50.

Specifically, the processor 501 executes the following functions by running or executing software programs and/or modules stored in the memory 502, and calling data stored in the memory 502:

Receive the DRS through the transceiver 403; determine the symbol for transmitting the measurement reference signal; use different receiving beams or the same receiving beam, and receive the measurement reference signal on the symbol for determining the transmission of the measurement reference signal. Among them, the measurement reference signal is used to measure the beam quality for beam management.

On the other hand, an embodiment of the present application provides a DRS sending method, which is applied in a communication process between a network device and a terminal in an unlicensed spectrum. As shown in FIG. 6, an embodiment of the present application provides a DRS sending method that may include:

S601. The network device performs carrier sensing, determines that the carrier is idle, and obtains the MCOT in the DMTC.

Among them, in S601, the network device may perform carrier sensing for a period of time before the DMTC and within the DMTC, and this application does not limit the specific time domain location of the carrier sensing.

Specifically, carrier sensing is performed in S601 to determine whether the carrier is idle, and the process of obtaining MCOT, that is, the foregoing LBT process, will not be repeated here. There are multiple modes of LBT, which can be configured according to actual needs, and this application does not make specific restrictions. Further, as mentioned above, carrier sensing may be omnidirectional carrier sensing or directional carrier sensing.

In one possible implementation, in S601, after determining that the carrier is idle, the network device immediately enters the MCOT, which is called LBT without random backoff process, that is, LBT is a fixed time length. In this implementation, the success rate of LBT is improved, and the chance of the network device in the DMTC to send signals is increased.

Of course, LBT with a random backoff process may also be used in S601, and the embodiment of the present application does not specifically limit whether the LBT process in S601 includes a random backoff process. The content of the random backoff process is not specifically limited.

Among them, random backoff refers to that in the unlicensed spectrum, if the network device determines that the carrier is idle, it waits for a period of time, and if the carrier is still idle within the waiting time, the carrier will be selected for transmission.

S602. The network device uses the determined idle carrier to send the first signal of the target beam in the MCOT, or the network device uses the determined idle carrier in the MCOT to send the DRS of the target beam in the target beam and send M measurements in each beam of N Reference signal.

The first signal of the target beam may include the DRS sent to the target beam and M measurement reference signals sent to the N beams.

In a possible implementation, there may be no symbol interval between the DRS of the target beam and the M measurement reference signals, and there may also be no symbol interval between two consecutive measurement reference signals in the M measurement reference signals.

In another possible implementation, there may be an interval of A symbols between the DRS of the target beam and the M measurement reference signals, and there may be an interval of B symbols between two consecutive measurement reference signals in the M measurement reference signals. . Among them, the values of A and B can be configured according to actual needs.

It should be noted that the description of a certain signal sent to a certain beam in this application refers to sending the signal in the direction of the beam, which can also be understood as using the beam to send the signal.

Among them, the DRS is used to discover network devices. The DRS has been described in detail in conjunction with Figure 1 in the foregoing content, and will not be repeated here.

Specifically, the measurement reference signal is used to measure beam quality for beam management. The embodiment of the present application does not specifically limit the content of the measurement reference signal, and can be configured according to actual requirements. The measurement reference signal of a certain beam referred to in this article refers to the transmission of the measurement reference signal in the beam. Whether the reference signal content of different beams is the same is not limited, but the transmission beams are limited to be different.

In a possible implementation, the measurement reference signal may be a signal generated based on a pseudo-random sequence. Of course, the measurement reference signal can also be other content.

Exemplarily, the pseudo-random sequence may include a Gold sequence, or an M sequence, or a ZC sequence.

For example, the measurement reference signal can use the same sequence generation method as the CSI-RS in NR, and the generation of the CSI-RS sequence r(m) is based on the pseudo-random sequence c(i), such as

Among them, the pseudo-random sequence c(i) is a Gold sequence, and its generation method is:

c(n)=(x ₁ (n+N _C )+x ₂ (n+N _C ))mod2;

x ₁ (n+31)=(x ₁ (n+3)+x ₁ (n))mod2;

x ₂ (n+31)=(x ₂ (n+3)+x ₂ (n+2)+x ₂ (n+1)+x ₂ (n))mod2;

Among them, N _C =1600, and x ₁ and x ₂ are two M sequences. The sequence x _{1 is} initialized to x ₁ (0) = 1, x ₁ (n) = 0, n = 1, 2,..., 30. The initialization of x ₂ is related to the time domain position of the CSI-RS.

In a possible implementation, the initial value of the pseudo-random sequence used to measure the reference signal may be related to the time domain position and/or frequency domain position and/or beam direction of the DRS.

It should be noted that the above example only illustrates the content of a measurement reference signal by way of example, and does not specifically limit the content of the measurement reference signal.

Specifically, the measurement reference signal may be mapped to all subcarriers of one symbol, or may be mapped to some subcarriers at equal intervals, and the mapping position of the measurement reference signal is not specifically limited in this application.

In a possible implementation, there may be a power deviation value between the measurement reference signal and the DRS in the first signal.

In a possible implementation, the first signal may further include indication information; the indication information is used to indicate the first feature of the measurement reference signal included in the first signal. Wherein, the first feature may include one or more of the following: the initial value of the pseudo-random sequence for generating the measurement reference signal, the pseudo-random sequence initialization method used for the measurement reference signal, and the number of symbols occupied by a single measurement reference signal , The duration of a single measurement reference signal, the value of N, the value of M, the mapping position of the measurement reference signal in the carrier, and the power of the measurement reference signal. Wherein, each item in the above characteristics may be a fixed value, or may be a non-fixed value having a specific relationship with the first signal transmission time, frequency domain, etc.

Optionally, the power of the measurement reference signal included in the DRS indicated by the indication information may be the absolute value of the power of the measurement reference signal, or may be the power difference between the measurement reference signal and the DRS.

In a possible implementation, the DRS may also include indication information; the indication information is used to indicate the first feature of the measurement reference signal sent immediately following the DRS.

In a possible implementation manner, the first signal, DRS, PDCCH, PDSCH, and other downlink signals or channels may carry the second feature of the measurement reference signal sent immediately following the DRS in a specific time period. Sending immediately following the DRS refers to the unsigned interval between the DRS and the measurement reference signal.

In a possible implementation, the first signal, DRS, PDCCH, PDSCH, and other downlink signals or channels can carry type information of the measurement reference signal sent immediately following the DRS in a specific time period, and the type information is used to indicate the measurement reference signal belongs to The classification according to the second feature.

For example, different types of first signals can be defined according to the second characteristics. Assuming that the network device is configured with 8 transmission beams, the first signal of the definition type 1 includes the DRS of the target beam and 8 measurement reference signals sent to the 8 transmission beams, and the first signal of the definition type 2 includes the DRS of the target beam And the 8 measurement reference signals sent to the target beam, the first signal of the definition type 3 includes the DRS of the target beam and the 8 measurement reference signals sent to the 8 sub-beams divided by the target beam, and the first signal of the definition type 4 Including the DRS of the target beam and 8 measurement reference signals sent to the third sub-beam divided by the target beam.

The first signal, DRS, PDCCH, PDSCH, and other downlink signals or channels can carry type information of the measurement reference signal sent immediately following the DRS in a specific time period. The type information indicates: starting from a specific time point, the 4*i+1 The first signal in a DMTC is “Type One”, the first signal in the 4*i+2th DMTC is “Type Two”, the first signal in the 4*i+3th DMTC is “Type Three”, and the first signal in the 4*i+3th DMTC is “Type three”. *The first signal in i+4 DMTCs is'Type Four', where i is an integer greater than or equal to 0 and less than 10.

Specifically, the target beam is any one of the transmission beams configured by the network device that does not transmit the DRS. When the network device selects the target beam and switches the target beam, it may be selected in any order, or may be selected in the order of the configured transmit beam numbers, which is not specifically limited in the embodiment of the present application.

In a possible implementation, the target beam is all transmission beams configured by the network device, which may be understood as the transmission beam included in the reception beam for carrier sensing by the network device.

If the network device performs omnidirectional carrier sensing, the transmission beams included in the receiving beam of the network device performing carrier sensing are all possible transmit beams configured for the network device. If the network device performs directional carrier sensing, the transmitting beam included in the receiving beam of the network device performing carrier sensing is a part of the transmitting beam configured for the network device.

In a possible implementation, S602 can be specifically replaced with step 1 and step 2.

Step 1. The network device sends the DRS of the target beam on the target beam among the R symbols in the MCOT.

Among them, R is the number of symbols occupied by the discovery signal.

Step 2. The network device sends the measurement reference signals of the N beams on the consecutive Q symbols following the R symbols in the MCOT.

Among them, Q symbols are the total number of symbols occupied by N measurement reference signals, that is, one measurement reference signal occupies Q/N symbols.

Specifically, N may be greater than or equal to 1, and the value of N may be configured according to actual requirements, which is not specifically limited in the embodiment of the present application. When the value of N is larger, there are more opportunities to send the measurement reference signal.

In a possible implementation, the N beams are part or all of all the transmission beams configured by the network device. In this implementation manner, the transmission beams for subsequent communication are selected from the configured transmission beams through beam management, so the N beams are part or all of the configured transmission beams.

In a possible implementation, when N is equal to 1, the N beams may be the target beam, or the N beams may be any one of all the transmission beams except the target beam.

In a possible implementation, at least one measurement reference signal can be sent on one beam. Therefore, a total of M measurement reference signals are sent on N beams, that is, M is greater than or equal to N. The embodiment of the present application does not specifically limit the number of measurement reference signals sent on one beam.

In a possible implementation, N is equal to 1, and M is equal to the number of all transmit beams configured by the network device.

In one possible implementation, N is equal to 1, and M is equal to 1.

In a possible implementation, N is equal to M and equal to the number of all transmit beams configured by the network device.

In a possible implementation, N is equal to M and is less than the number of all transmit beams configured by the network device.

Optionally, when N is greater than 1, and the N beams are different beams, the number of N can be determined according to the duration of the MCOT. The specific process of determining N is not specifically limited in this application.

The following examples illustrate two possible implementations of determining N:

In a possible implementation, if the duration of the MCOT is long enough to support the transmission of measurement reference signals of all transmission beams configured by the network device, N may be the number of all transmission beams configured by the network device.

In a possible implementation, N may be the larger of the number of all transmission beams configured by the network device and the number of measurement reference signals that are supported to be sent after the current DRS is sent in the MCOT.

In a possible implementation, when the MCOT duration is limited, when N is the number of measurement reference signals that are supported to be sent after the current DRS is sent in the MCOT, and the number is less than the number of all transmit beams configured by the network device, it needs to be configured in the network device Part of the transmission beams selected from all the transmission beams of the network equipment may specifically include: N beams are randomly selected among all transmission beams configured by the network equipment; or, the N beams are all transmission beams configured by the network equipment according to the preset N beams selected in sequence; or, the N beams are N beams selected in order of use frequency among all the transmission beams configured by the network device.

The content of the preset sequence can be configured according to actual needs, which is not specifically limited in the embodiment of the present application.

In another possible implementation, the N beams are part or all of the multiple sub-beams divided by the target beam. In this implementation manner, a narrower beam is selected from the target beams as the transmission beam for subsequent communication through beam management, so the N beams are part or all of the subcarriers divided by the target beam.

It should be noted that in the implementation of part or all of the multiple sub-beams divided by N beams as the target beam, the method for determining N is similar to the above-mentioned method for determining N. You can refer to the foregoing content and configure the network device during reference. All the sending beams in is replaced with all the sub-beams divided by the target beam, and the specific process is not repeated here.

Further, after S602, if there are beams that have not sent DRS among all the transmission beams, and the DMTC meets the first preset condition, and the MCOT meets the second preset condition, the network device switches the target beam and performs S602 again.

Further, after S602, if there are beams that do not transmit DRS among all the transmission beams, and the DMTC meets the first preset condition, and the MCOT does not meet the second preset condition, perform S601 and S602 again until the DMTC ends, or All DRSs of the transmitting beam configured by the network device have been transmitted.

The first preset condition is used to determine whether the DMTC can still send the first signal (or DRS) once. The content of the first preset condition can be configured according to actual needs, which is not specifically limited in the embodiment of the present application.

In a possible implementation, the first preset condition may include: DMTC is not over.

In another possible implementation, the first preset condition may include: the remaining duration of the DMTC is greater than or equal to a preset threshold. The content of the preset threshold can be configured according to actual needs, which is not specifically limited in the embodiment of the present application.

Among them, the second preset condition is used to determine whether the MCOT can still send the first signal (or DRS) once. The content of the second preset bar can be configured according to actual needs, which is not specifically limited in the embodiment of this application. .

In a possible implementation, the second preset condition may include: the number of remaining symbols of the MCOT is greater than the number of X first signals or the number of symbols occupied by the DRS; X is greater than or equal to 1. The value of X can be configured according to actual requirements, which is not specifically limited in the embodiment of the present application.

In a possible implementation, the second preset condition may include: the number of remaining symbols of the MCOT is greater than the number of symbols occupied by X DRS plus the remaining value; X is greater than or equal to 1. The value of X and the value of the margin value can be configured according to actual requirements, which is not specifically limited in the embodiment of the present application.

Correspondingly, as shown in FIG. 6, after S602, the method may further include S603.

S603: The network device judges whether there are beams that have not yet sent DRS among all the transmission beams configured by the network device.

In S603, if the network device determines that there are beams that have not sent DTS among all the transmission beams configured by the network device, execute S604; otherwise, end the transmission of DRS.

S604: The network device judges whether the DMTC meets the first preset condition.

In S604, if the network device determines that the DMTC meets the first preset condition, execute S605; otherwise, end the sending of the DRS.

S605: The network device judges whether the MCOT meets the second preset condition.

In S605, if the network device determines that the MCOT meets the second preset condition, the network device switches the target beam and executes S602 again. Otherwise, the network device executes S601 again.

Wherein, switching the target beam refers to switching the target beam to any transmission beam that has not yet transmitted the DRS among all the transmission beams configured by the network device. This application does not specifically limit the method of selecting the target beam when switching the target beam.

Optionally, the network device can adjust the beam direction by adjusting the weight between each element in the antenna array, and the target beam has been switched.

In a possible implementation, when the N beams are part of all the transmission beams configured by the network device, the first signals of different target beams include measurement reference signals sent to the N beams, and the beam directions are the same. Or, when the N beams are part of all the transmission beams configured by the network device, the DRS of different target beams are followed by the measurement reference signals sent to the N beams, and the beam directions are the same.

In another possible implementation, when the N beams are part of all the transmission beams configured by the network device, the first signals of different target beams include measurement reference signals sent to the N beams, and the beam directions are different. Or, when the N beams are part of all the transmission beams configured by the network device, the DRS of different target beams are followed by the measurement reference signals sent to the N beams, and the beam directions are different. The measurement reference signals sent to the N beams included in the DRS sent when the network device switches the target beam to perform S602 again may be N beams for which no measurement reference signal is sent.

The following uses an example to illustrate the process of the network device performing S602 to S605 after the network device obtains the MCOT in S601. In the following example, assume that the network device is a base station, and the base station is configured with 8 transmit beams, which are recorded as transmit beam 1 to transmit beam 8. The first signal includes DRS, and DRS includes SSS, PSS, PBCH, PDCCH and PDSCH. DRS occupies 8 symbols, and one measurement reference signal occupies 1 symbol.

Example 1: The first signal includes the DRS of the target beam and the measurement reference signals sent to all the transmission beams configured by the base station.

In this example, the network device in the MCOT uses an idle carrier to transmit the DRS of the beam with transmit beam 1 in 8 symbols, and then transmits the measurement reference on transmit beam 1 to transmit beam 8 in sequence of 8 consecutive symbols signal.

Then, the network device judges that the DMTC is not over yet, and the MCOT can also send at least one first signal. The network device is in the MCOT and uses the idle carrier in 8 symbols to send the DRS of the beam in 8 symbols, and then sends the DRS of the beam in 8 consecutive 8 symbols. The two symbols are used to transmit measurement reference signals on transmit beam 1 to transmit beam 8 respectively. When the MCOT is not enough to send a first signal, the network device performs LBT again to obtain the MCOT until the DMTC window ends, or the DRS of all beam directions has been sent in the current DMTC. Example 1 A scenario diagram of a network device sending DRS is shown in Figure 7. FIG. 7 only illustrates the DRS transmission of the transmit beam 1, and when the target beam is other transmit beams, the DRS transmission is similar, which is not shown in FIG. 7.

Example 2: The first signal includes the DRS of the target beam and the measurement reference signal sent to a sending beam configured by the base station.

In this example, the network device in the MCOT uses an idle carrier to transmit the beam DRS in 8 symbols to transmit beam 1, and then transmits 8 measurement reference signals to transmit beam 1 in the next 8 symbols.

Then, the network device judges that the DMTC is not over yet, and the MCOT can also send at least one first signal. The network device is in the MCOT and uses the idle carrier to send the DRS of the beam on 8 symbols to send beam 2, and then send the DRS of the beam on the next 8 symbols are used to transmit beam 2 to send 8 measurement reference signals. When the MCOT is not enough to send a first signal, the network device performs LBT again to obtain the MCOT until the DMTC window ends, or the DRS of all beam directions has been sent in the current DMTC. Example 2 A schematic diagram of a scenario where a network device sends a DRS is shown in Figure 8. FIG. 8 only illustrates the DRS transmission of the transmit beam 1, and when the target beam is another transmit beam, the DRS transmission is similar, which is not shown in FIG. 8.

Example 3: The first signal includes the DRS of the target beam and the measurement reference signals of all sub-beams sent to the target beam refinement. The network equipment refines the target beam into 8 beams, which are called sub-beam 1 to sub-beam 8.

In this example, the network device uses an idle carrier in the MCOT to transmit the DRS of the beam with transmit beam 1 in 8 symbols, and then transmit the sub-beams 1 to sub-beams 1 to sub-beams in the next 8 symbols respectively. The beams 8 respectively send measurement reference signals.

Then, the network device judges that the DMTC is not over yet, and the MCOT can also send at least one first signal. The network device is in the MCOT and uses the idle carrier in 8 symbols to send the DRS of the beam with the sending beam 2, and then in the next The 8 symbols respectively use the sub-beam 1 to the sub-beam 8 refined by the transmitting beam 2 to transmit measurement reference signals. When the MCOT is not enough to send a first signal, the network device performs LBT again to obtain the MCOT until the DMTC window ends, or the DRS of all beam directions has been sent in the current DMTC. Example 3 A schematic diagram of a scenario where a network device sends a DRS is shown in FIG. 9. FIG. 9 only illustrates the DRS transmission of the transmit beam 1, and when the target beam is other transmit beams, the DRS transmission is similar, which is not shown in FIG. 9.

Example 4: The first signal includes the DRS of the target beam and the measurement reference signal sent to a sub-beam of the target beam refinement. The network equipment refines the target beam into 8 sub-beams, which are called sub-beam 1 to sub-beam 8.

In this example, the network device uses the idle carrier in the MCOT to transmit the DRS of the beam with transmit beam 1 in 8 symbols, and then transmits 8 sub-beams 3 with target beam 1 in the next 8 symbols. Second measurement reference signal.

Then, the network device judges that the DMTC is not over yet, and the MCOT can also send at least one first signal. The network device is in the MCOT and uses the idle carrier in 8 symbols to send the DRS of the beam with the sending beam 2, and then in the next The 8 symbols respectively use the sub-beam 3 refined by the transmitting beam 2 to send 8 measurement reference signals. When the MCOT is not enough to send a first signal, the network device performs LBT again to obtain the MCOT until the DMTC window ends, or the DRS of all beam directions has been sent in the current DMTC. Example 4 A schematic diagram of a scenario where a network device sends a DRS is shown in Figure 10. FIG. 10 only illustrates the DRS transmission of the transmit beam 1, and when the target beam is another transmit beam, the DRS transmission is similar, which is not shown in FIG. 10.

After the above-mentioned S601 to S605 network equipment sends the DRS, the terminal performs cell search according to the DMTC cycle, and finds the network equipment after searching for the PSS/SSS in the DRS. For the time-domain position relationship between the DRS and the measurement signal, and the beam reverse relationship, the terminal can learn according to the agreement. After the terminal has searched for the PSS/SSS in the DRS, it can use the configured receiving beam to receive the measurement reference signal and perform the beam Quality measurement.

In an optional manner, the terminal may use one of the configured receiving beams to receive the measurement reference signal of each symbol.

In an optional manner, the terminal may use different receive beams in the configured receive beams to receive measurement reference signals of different symbols.

It should be noted that the foregoing content has been described for the measurement process of the terminal, and will not be repeated here.

After the terminal performs the measurement, the terminal and the network device can select the beam pair according to the measurement result, and use the selected beam pair to perform the subsequent communication process.

The foregoing mainly introduces the solutions provided in the embodiments of the present application from the perspective of interaction between various network elements. It can be understood that, in order to realize the aforementioned functions, the aforementioned network devices and terminals include hardware structures and/or software modules corresponding to the respective functions. The functional unit in the network device that implements the above DRS sending method is called a DRS sending device. Those skilled in the art should easily realize that in combination with the units and algorithm steps of the examples described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software-driven hardware depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.

The embodiment of the present application may divide the functional modules of the DRS sending device according to the foregoing method examples. For example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The above-mentioned integrated modules can be implemented in the form of hardware or software functional modules. It should be noted that the division of modules in the embodiments of the present application is illustrative, and is only a logical function division, and there may be other division methods in actual implementation.

In the case of dividing each functional module corresponding to each function, FIG. 11 shows a possible schematic structural diagram of the DRS sending apparatus 110 deployed in the network equipment involved in the foregoing embodiment. The DRS sending device 110 may be the network device itself, or may be a functional module or chip in the network device. As shown in FIG. 11, the DRS sending apparatus 110 may include: a listening unit 1101, a processing unit 1102, and a sending unit 1103. The listening unit 1101 is used to perform the process S601 in FIG. 6; the processing unit 1102 is used to perform the process S603 in FIG. 6 through the sending unit 1103. Among them, all relevant content of the steps involved in the above method embodiments can be cited in the functional description of the corresponding functional module, and will not be repeated here.

Further, as shown in FIG. 11, the DRS sending device 110 may further include a judging unit 1104, configured to execute the procedures S603, S604, and S605 in FIG.

In the case of using an integrated unit, FIG. 12 shows a possible schematic structural diagram of the DRS sending device 120 involved in the foregoing embodiment. The DRS sending device may include: a processing module 1201 and a communication module 1202. The processing module 1201 is used to control and manage the actions of the DRS sending device 120. For example, the processing module 1201 is used to execute the processes S601, S603, S604, and S605 in FIG. 6, and the communication module 1202 is used to execute the process S602 in FIG. The DRS sending device 120 may also include a storage module 1203 for storing program codes and data of the DRS sending device 120.

The processing module 1201 may be the processor 401 in the physical structure of the network device 40 shown in FIG. 4, and may be a processor or a controller. For example, it may be a CPU, a general-purpose processor, DSP, ASIC, FPGA or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute various exemplary logical blocks, modules and circuits described in conjunction with the disclosure of this application. The processor 1201 may also be a combination for realizing computing functions, for example, including a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and so on. The communication module 1202 may be the transceiver 403 in the physical structure of the network device 40 shown in FIG. 4, and the communication module 1202 may be a communication port, or may be a transceiver, a transceiver circuit, or a communication interface. Alternatively, the above-mentioned communication interface may realize communication with other devices through the above-mentioned element having a transceiver function. The above-mentioned elements with transceiving functions can be implemented by antennas and/or radio frequency devices. The storage module 1203 may be the memory 402 in the physical structure of the network device 40 shown in FIG. 4.

When the processing module 1201 is a processor, the communication module 1202 is a transceiver, and the storage module 1203 is a memory, the DRS sending apparatus 120 involved in FIG. 12 in the embodiment of the present application may be the network device 40 shown in FIG. 4.

As mentioned above, the DRS sending apparatus 110 or the DRS sending apparatus 120 provided by the embodiments of the present application can be used to implement the functions of the network equipment in the methods implemented in the above embodiments of the present application. For ease of description, only the same as those in the embodiments of the present application are shown. For related parts and specific technical details that are not disclosed, please refer to the various embodiments of this application.

In the case of dividing each functional module corresponding to each function, FIG. 13 shows a possible schematic structural diagram of the DRS receiving apparatus 130 deployed in the terminal involved in the foregoing embodiment. The DRS receiving device 130 may be the terminal itself, or may be a functional module or chip in the terminal. As shown in FIG. 13, the DRS receiving device 130 may include: a receiving unit 1301 and a processing unit 1302. Among them, the receiving unit 1301 is used to receive DRS; the processing unit 1302 is used to determine the symbol for transmitting the measurement reference signal, and the receiving unit 1302 uses different receiving beams or the same receiving beam to receive the measurement reference signal on the symbol for transmitting the measurement reference signal. Among them, the measurement reference signal is used to measure the beam quality for beam management.

In the case of using an integrated unit, FIG. 14 shows a possible structural schematic diagram of the DRS receiving device 140 involved in the foregoing embodiment. The DRS receiving device 140 may include: a processing module 1401 and a communication module 1402. The processing module 1401 is used to control and manage the actions of the DRS receiving device 140. For example, the processing module 1401 is configured to receive the DRS through the communication module 1402 and determine the symbol of the transmission measurement reference signal, and the communication module 1402 adopts different receiving beams or the same receiving beam to receive the measurement reference signal on the symbol of the transmission measurement reference signal. The DRS receiving device 140 may further include a storage module 1403 for storing program codes and data of the DRS receiving device 140.

The processing module 1401 may be the processor 501 in the physical structure of the terminal 50 shown in FIG. 5, and may be a processor or a controller. For example, it may be a CPU, a general-purpose processor, DSP, ASIC, FPGA or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute various exemplary logical blocks, modules and circuits described in conjunction with the disclosure of this application. The processor 1401 may also be a combination that implements computing functions, for example, includes a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and so on. The communication module 1402 may be the transceiver 503 in the physical structure of the terminal 50 shown in FIG. 5, and the communication module 1402 may be a communication port, or may be a transceiver, a transceiver circuit, or a communication interface. Alternatively, the above-mentioned communication interface may realize communication with other devices through the above-mentioned element having a transceiver function. The above-mentioned elements with transceiving functions can be implemented by antennas and/or radio frequency devices. The storage module 1403 may be the memory 502 in the physical structure of the terminal 50 shown in FIG. 5.

When the processing module 1401 is a processor, the communication module 1402 is a transceiver, and the storage module 1403 is a memory, the DRS receiving apparatus 140 involved in FIG. 14 in the embodiment of the present application may be the terminal 50 shown in FIG. 5.

As mentioned above, the DRS receiving device 130 or the DRS receiving device 140 provided in the embodiments of the present application can be used to implement the functions of the terminal in the methods implemented by the various embodiments of the present application. For the convenience of description, only those related to the embodiments of the present application are shown. For the specific technical details that are not disclosed, please refer to the various embodiments of this application.

As another form of this embodiment, a computer-readable storage medium is provided, and an instruction is stored thereon. When the instruction is executed, the DRS sending method in the foregoing method embodiment is executed.

As another form of this embodiment, a computer program product containing instructions is provided, and when the instructions are executed, the DRS sending method in the foregoing method embodiment is executed.

Those skilled in the art can clearly understand that, for the convenience and conciseness of the description, the specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

Those skilled in the art should be aware that, in one or more of the above examples, the functions described in this application can be implemented by hardware, software, firmware, or any combination thereof. When implemented by software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or codes on the computer-readable medium. Computer readable media include computer storage media and communication media, where communication media includes any media that facilitates the transfer of computer programs from one place to another. The storage medium may be any available medium that can be accessed by a general-purpose or special-purpose computer. Those skilled in the art can clearly understand that, for the convenience and conciseness of the description, the specific working process of the above-described system, device, and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method may be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or It can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

In addition, the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may be separately physically included, or two or more units may be integrated into one unit. The above-mentioned integrated unit can be realized in the form of hardware, or in the form of hardware plus software functional unit.

The above-mentioned integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The above-mentioned software function unit is stored in a storage medium, and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device, etc.) to execute part of the steps of the method described in each embodiment of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code .

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the application, not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand: The technical solutions recorded in the foregoing embodiments are modified, or some of the technical features thereof are equivalently replaced; these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

A method for sending discovery signal DRS, which is characterized in that it includes:

The network equipment performs carrier sensing, determines that the carrier is idle, and obtains the maximum channel occupation time MCOT in the discovery signal measurement timing configuration DMTC;

The network device uses the carrier to send the first signal of the target beam in the MCOT, where the first signal includes the discovery signal DRS sent to the target beam and M measurement reference signals sent to the N beams; or, the The network device uses the carrier in the MCOT, sends the DRS of the target beam in the target beam, and sends M measurement reference signals in the N beams;

Wherein, the DRS is used to discover network equipment; the target beam is any transmission beam that does not transmit DRS among all the transmission beams configured by the network equipment; the N is greater than or equal to 1, and the measurement reference signal is used for the measurement beam Quality; the N beams are part or all of all the transmission beams configured by the network device, or the N beams are part or all of the multiple sub-beams divided by the target beam; the M is greater than or Equal to the N.
The method of claim 1, wherein the method further comprises:

If there are beams that do not transmit DRS among all the transmission beams, and the DMTC meets the first preset condition, and the MCOT meets the second preset condition, the network device switches the target beam and re-executes The carrier is used to send the first signal of the switched target beam in the MCOT, or the network device switches the target beam, sends a DRS in the switched target beam, and sends M measurements in the N beams Reference signal.
The method according to claim 1 or 2, wherein the N is equal to 1, and the N beams are the target beams.
The method according to any one of claims 1 to 3, wherein the N is the larger of the number of all the transmission beams and the number of measurement reference signals that can be transmitted in the MCOT.
The method of claim 4, wherein:

The N beams are N beams arbitrarily selected from all the transmission beams;

or,

The N beams are N beams selected in a preset order among all the transmission beams;

or,

The N beams are N beams selected in order of use frequency among all the transmission beams.
The method according to any one of claims 2-5, wherein the method further comprises:

If there are beams that do not transmit DRS among all the transmission beams, and the DMTC meets the first preset condition, and the MCOT does not meet the second preset condition, perform carrier sensing by the network device again, and determine When the carrier is idle, the MCOT is acquired in the DMTC.
The method of claim 2 or 6, wherein:

The first preset condition includes: the DMTC is not over, or the remaining duration of the DMTC is greater than or equal to a preset threshold;

The second preset condition includes: the number of remaining symbols of the MCOT is greater than X of the first signals or the number of symbols occupied by the DRS; and the X is greater than or equal to 1.
The method according to any one of claims 1-7, wherein:

The first signal or the DRS includes indication information, and the indication information is used to indicate the first feature of the measurement reference signal included in the first signal, or the indication information indicates that the DRS signal is sent immediately after the DRS signal. Measuring the first feature of the reference signal;

Wherein, the first feature includes one or more of the following: generating the initial value of the pseudo-random sequence of the measurement reference signal, the pseudo-random sequence initialization method adopted by the measurement reference signal, and one of the measurement reference The number of symbols occupied by the signal, the duration of one measurement reference signal, the value of N, the value of M, the mapping position of the measurement reference signal in the carrier, and the power of the measurement reference signal.
The method according to any one of claims 1-8, wherein the measurement reference signal comprises:

A signal generated based on a pseudo-random sequence; wherein the pseudo-random sequence includes a Gold sequence, or an M sequence or a ZC sequence.
A device for sending a discovery signal DRS is characterized in that it comprises a listening unit, a processing unit and a sending unit: wherein,

The monitoring unit is used to perform carrier sensing, determine that the carrier is idle, and obtain the maximum channel occupation time MCOT in the discovery signal measurement timing configuration DMTC;

The processing unit is configured to use the carrier in the MCOT to send a first signal of a target beam through the sending unit, the first signal including the discovery signal DRS sent to the target beam and sent to N beams Or, the processing unit is configured to use the carrier in the MCOT, and through the sending unit, send the DRS of the target beam in the target beam, and send the DRS in the N beams M measurement reference signals;

Wherein, the DRS is used to discover the network device where the DRS sending apparatus is located; the target beam is any one of all the sending beams configured by the network device that does not send DRS; the N is greater than or equal to 1, The measurement reference signal is used to measure beam quality; the N beams are part or all of all the transmission beams, or the N beams are part or all of the multiple sub-beams divided by the target beam; The M is greater than or equal to the N.
The device of claim 10, wherein:

The device further includes a judging unit, configured to judge whether there are beams that have not sent DRS among all the transmission beams, determine whether the DMTC meets a first preset condition, and determine whether the MCOT meets a second preset condition;

The processing unit is further configured to: if the determining unit determines that there are beams that do not transmit DRS among all the transmission beams, and the DMTC meets a first preset condition, and the MCOT meets a second preset condition, Switch the target beam, re-execute using the carrier to send the first signal of the switched target beam in the MCOT, or switch the target beam, send the DRS on the switched target beam, and send the DRS in the N The beam sends M measurement reference signals.
The apparatus according to claim 10 or 11, wherein the N is equal to 1, and the N beams are the target beams.
The apparatus according to any one of claims 10-12, wherein the N is the larger of the number of all the transmission beams and the number of measurement reference signals that can be transmitted in the MCOT.
The device of claim 13, wherein:

The N beams are N beams arbitrarily selected from all the transmission beams;

or,

The N beams are N beams selected in a preset order among all the transmission beams;

or,

The N beams are N beams selected in order of use frequency among all the transmission beams.
The device according to claim 11, wherein the listening unit is further configured to:

If the determining unit determines that there are beams that do not transmit DRS among all the transmission beams, and the DMTC meets the first preset condition, and the MCOT does not meet the second preset condition, perform all Performing carrier sensing, determining that the carrier is idle, and acquiring the MCOT in the DMTC.
The device according to claim 11 or 15, characterized in that:

The first preset condition includes: the DMTC is not over, or the remaining duration of the DMTC is greater than or equal to a preset threshold;

The second preset condition includes: the number of remaining symbols of the MCOT is greater than X of the first signals or the number of symbols occupied by the DRS; and the X is greater than or equal to 1.
The device according to any one of claims 10-16, wherein:

The first signal or the DRS includes indication information, the indication information is used to indicate the characteristics of the measurement reference signal included in the first signal, or the indication information indicates the measurement reference signal sent immediately following the DRS signal The first characteristic of the signal;

Wherein, the first feature includes one or more of the following: generating the initial value of the pseudo-random sequence of the measurement reference signal, the pseudo-random sequence initialization method adopted by the measurement reference signal, and one of the measurement reference The number of symbols occupied by the signal, the duration of one measurement reference signal, the value of N, the value of M, the mapping position of the measurement reference signal in the carrier, and the power of the measurement reference signal.
The device according to any one of claims 10-17, wherein the measurement reference signal comprises:

A signal generated based on a pseudo-random sequence; wherein, the pseudo-random sequence includes a Gold sequence, or an M sequence, or a ZC sequence.
A DRS sending device, comprising a memory, a processor, and a program stored on the memory and capable of running on the processor, wherein the processor executes the program to implement claims 1-9 Any one of the DRS sending methods.
A network device, characterized by comprising the DRS sending device according to any one of claims 10-19.
A computer-readable storage medium, characterized by comprising instructions, which when run on a computer, causes the computer to execute the DRS sending method according to any one of claims 1-9.
A computer program product, characterized by comprising instructions, which when run on a computer, causes the computer to execute the DRS sending method according to any one of claims 1-9.