WO2018177332A1 - Downlink transmission detection method, base station and terminal - Google Patents

Abstract

Disclosed are a downlink transmission detection method, base station and terminal. The downlink transmission detection method comprises: issuing an enhanced reference signal during downlink transmission to enable a terminal to determine a channel occupancy condition of a base station according to the enhanced reference signal. The technical solution of the present application can provide a higher density of a reference signal for a terminal to enable an enhanced coverage of the reference signal, such that the terminal can acquire the enhanced reference signal issued by a base station more conveniently and rapidly to determine a channel occupancy condition of the base station, facilitating effective detection of downlink transmission by the terminal according to the enhanced reference signal and improving the effectiveness of communication.

Description

Downlink transmission detection method, base station and terminal

The present application claims priority to Chinese Patent Application No. 200910194297.3, entitled "Down Transmission Detection Method, Base Station and Terminal", filed on March 28, 2017, the entire contents of which is incorporated herein by reference. in.

Technical field

The present application relates to the field of communications technologies, and in particular, to a downlink transmission detection method, a base station, and a terminal.

Background technique

The MulteFire technology is a radio access technology that extends LTE (Long Term Evolution) to an unlicensed band. It can be referred to as MF. In this technology, an unlicensed band carrier can provide services independently without using a licensed band carrier.

At present, a Wi-Fi-like carrier is introduced at the physical layer of the MF (MulteFire) in order to enable a plurality of unlicensed band devices (such as Wi-Fi devices) to occupy the unlicensed band channels fairly and avoid mutual interference between devices in the unlicensed band. The LBT (Listen Before Talk) mechanism of the monitoring technology shall not transmit a signal when the base station or the terminal monitors that the unlicensed band channel is occupied, that is, when the LBT fails, when the unlicensed band channel is idle, The signal is sent only when the LBT is successful.

However, due to the unlicensed band devices located in some special geographical locations, for example, water meters and electricity meters located in the basement, the channel fading is relatively large due to the geographical location, and the signal penetration loss is relatively large, wherein the base station issues The reference signal is easily faded, affecting the terminal for downlink transmission detection.

Therefore, how to improve the effectiveness of the terminal for downlink transmission detection has become a technical problem to be solved.

Application content

The embodiment of the present application provides a downlink transmission detection method, a base station, and a terminal, which are to solve the technical problem that the accuracy of the downlink transmission detection is affected by the fading of the reference signal in the related art, and the coverage signal can be covered and enhanced. Effectively perform downlink transmission detection.

In a first aspect, the embodiment of the present application provides a downlink transmission detection method, including: releasing an enhanced reference signal in a downlink transmission process, so that the terminal determines a channel occupancy condition of the base station according to the enhanced reference signal.

In the foregoing embodiment of the present application, optionally, the method further includes: releasing a basic reference signal, where the terminal jointly detects, according to the basic reference signal and the enhanced reference signal, whether the base station occupies a channel for downlink transmission, where The basic reference signal includes one or more of a cell common reference signal, a demodulation reference signal, and a synchronization message signal, and a resource configuration of the enhanced reference signal is determined according to the basic reference signal.

In the foregoing embodiment of the present application, optionally, the step of issuing the enhanced reference signal specifically includes: releasing the enhanced reference signal in a first downlink transmission time interval within the transmission opportunity, for the terminal to determine The starting position of the downstream transmission.

In the foregoing embodiment of the present application, optionally, the step of issuing the enhanced reference signal specifically includes: releasing the enhanced reference signal in each downlink transmission time interval within the transmission opportunity.

In the foregoing embodiment of the present application, optionally, the method further includes: determining whether the coverage enhancement can be completed within the one downlink transmission time interval when the detection signal is issued in a downlink transmission time interval; when the determination result is yes And not issuing the enhanced reference signal; when the determination result is no, entering the step of issuing the enhanced reference signal, so that the enhanced reference signal is released in multiple downlink transmission time intervals.

In the foregoing embodiment of the present application, optionally, the method further includes: determining a signal sequence and a time-frequency position of the enhanced reference signal according to the cell common reference signal.

In the foregoing embodiment of the present application, optionally, the method further includes: determining a time-frequency location of the enhanced reference signal according to a cell identifier of a cell where the terminal is located.

In the foregoing embodiment of the present application, optionally, the step of issuing an enhanced reference signal includes: releasing the enhanced reference signal by using the same time-frequency position of all antenna ports.

In the foregoing embodiment of the present application, optionally, the actual number of antenna ports that issue the enhanced reference signal is the same as the actual number of antenna ports that issue the common reference signal of the cell, and the step of issuing the enhanced reference signal, Including: issuing different said enhanced reference signals at different locations through different antennas.

In the foregoing embodiment of the present application, optionally, the method further includes: determining a time-frequency position of the enhanced reference signal according to the demodulation reference signal.

In the foregoing embodiment of the present application, optionally, the method further includes: in a physical resource block, the time-frequency position of the enhanced reference signal is the same as the time-frequency position of the demodulation reference signal.

In the foregoing embodiment of the present application, optionally, the step of issuing the enhanced reference signal includes: releasing the enhanced reference signal in a first time slot and/or a second time slot of a downlink transmission time interval.

In the above embodiment of the present application, optionally, the number of OFDM symbols occupied by the enhanced reference signal is a predetermined number.

In the foregoing embodiment of the present application, optionally, the method further includes: determining, according to the length of the current downlink transmission time interval, the number of OFDM symbols occupied by the enhanced reference signal.

In the foregoing embodiment of the present application, optionally, the frequency domain resource size of the enhanced reference signal is a predetermined size.

In the foregoing embodiment of the present application, optionally, the method further includes: determining, according to the number of OFDM symbols occupied by the enhanced reference signal in one downlink transmission time interval and the density of each physical resource block, determining the enhanced reference signal. A frequency domain resource, wherein the enhanced reference signal has a constant transmission density during a downlink transmission time interval.

In the foregoing embodiment of the present application, optionally, the method further includes: determining a time-frequency position of the enhanced reference signal according to the channel state information reference signal.

In the foregoing embodiment of the present application, optionally, the method further includes: determining, when the enhanced reference signal is sent, whether the enhanced reference signal conflicts with a public signal or a user-specific signal; when determining a sending conflict, performing a corresponding conflict Processing method.

In the foregoing embodiment of the present application, optionally, the method further includes: determining, according to the primary system information block, a frequency domain resource of the enhanced reference signal.

In the foregoing embodiment of the present application, optionally, the method further includes: determining, according to a predetermined acquisition rule, a frequency domain resource of the enhanced reference signal, where the predetermined acquisition rule is a function of a cell identifier of a cell where the terminal is located.

In the above embodiment of the present application, optionally, the time-frequency position of the enhanced reference signal is fixed.

In the foregoing embodiment of the present application, optionally, the time-frequency position of the enhanced reference signal is determined according to the number of OFDM symbols occupied by one downlink transmission time interval.

In the foregoing embodiment of the present application, optionally, the step of issuing the enhanced reference signal specifically includes: releasing the enhanced reference signal in a full bandwidth.

In the foregoing embodiment of the present application, optionally, the step of issuing an enhanced reference signal includes: releasing the enhanced reference signal in a partial bandwidth, wherein the partial bandwidth is a predetermined amount of the entire bandwidth except the middle The bandwidth after the physical resource block.

In a second aspect, the embodiment of the present application further provides a non-transitory computer readable storage medium, where the non-transitory computer readable storage medium stores computer instructions, wherein the computer instructions cause the computer to perform the foregoing downlink of the present application. Transmission detection method.

In a third aspect, an embodiment of the present application further provides a computer program product, the computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions, when the program When the instructions are executed by the computer, the computer can execute the above-described downlink transmission detection method of the present application.

In a fourth aspect, the embodiment of the present application provides a base station, including: an enhanced reference signal issuing unit, which issues an enhanced reference signal during downlink transmission, so that the terminal determines a channel occupancy condition of the base station according to the enhanced reference signal.

In the foregoing embodiment of the present application, optionally, the method further includes: a joint issuing unit, advertises a basic reference signal, where the terminal jointly detects, according to the basic reference signal and the enhanced reference signal, whether the base station occupies a channel. Downlink transmission, wherein the basic reference signal comprises one or more of a cell common reference signal, a demodulation reference signal, and a synchronization message signal, and a resource configuration of the enhanced reference signal is determined according to the basic reference signal.

In the foregoing embodiment of the present application, the enhanced reference signal issuance unit is specifically configured to: issue the enhanced reference signal in a first downlink transmission time interval within the transmission opportunity, where the terminal determines the downlink The starting position of the transfer.

In the foregoing embodiment of the present application, optionally, the enhanced reference signal issuing unit is specifically configured to: issue the enhanced reference signal in each downlink transmission time interval within the transmission opportunity.

In the foregoing embodiment of the present application, optionally, the pre-judging unit determines whether the coverage enhancement can be completed within the one downlink transmission time interval when the detection signal is issued in a downlink transmission time interval, where When the determination result is yes, the enhanced reference signal is not issued, and when the determination result is no, the step of issuing the enhanced reference signal is entered, so that the enhanced reference signal is issued in multiple downlink transmission time intervals.

In the foregoing embodiment of the present application, optionally, the method further includes: a first determining unit, determining a signal sequence and a time-frequency position of the enhanced reference signal according to the cell common reference signal.

In the foregoing embodiment of the present application, optionally, the method further includes: a fifth determining unit, determining a time-frequency position of the enhanced reference signal according to a cell identifier of a cell where the terminal is located.

In the foregoing embodiment of the present application, optionally, the enhanced reference signal issuing unit is configured to: issue the enhanced reference signal by using the same time-frequency position of all antenna ports.

In the foregoing embodiment of the present application, optionally, the actual number of antenna ports that issue the enhanced reference signal is the same as the actual number of antenna ports that issue the common reference signal of the cell, and the enhanced reference signal issuance unit is used. : Different said enhanced reference signals are issued at different locations by different antennas.

In the foregoing embodiment of the present application, optionally, the method further includes: a sixth determining unit, determining a time-frequency position of the enhanced reference signal according to the demodulation reference signal.

In the foregoing embodiment of the present application, optionally, the method further includes: in a physical resource block, the time-frequency position of the enhanced reference signal is the same as the time-frequency position of the demodulation reference signal.

In the foregoing embodiment of the present application, optionally, the enhanced reference signal issuing unit is configured to: issue the enhanced reference signal in a first time slot and/or a second time slot of a downlink transmission time interval.

In the above embodiment of the present application, optionally, the number of OFDM symbols occupied by the enhanced reference signal is a predetermined number.

In the foregoing embodiment of the present application, optionally, the method further includes: a seventh determining unit, determining, according to the length of the current downlink transmission time interval, the number of OFDM symbols occupied by the enhanced reference signal.

In the foregoing embodiment of the present application, optionally, the frequency domain resource size of the enhanced reference signal is a predetermined size.

In the foregoing embodiment of the present application, optionally, the method further includes: an eighth determining unit, determining, according to the number of OFDM symbols occupied by the enhanced reference signal in one downlink transmission time interval and the density of each physical resource block, The frequency domain resource of the enhanced reference signal is described, wherein the enhanced reference signal has a constant transmission density during a downlink transmission time interval.

In the foregoing embodiment of the present application, optionally, the method further includes: a ninth determining unit, determining a time-frequency position of the enhanced reference signal according to the channel state information reference signal.

In the foregoing embodiment of the present application, optionally, the method further includes: a conflict determining unit, when transmitting the enhanced reference signal, determining whether the enhanced reference signal conflicts with a public signal or a user-specific signal; and the conflict processing unit determines When a conflict is sent, the corresponding conflict handling mode is executed.

In the foregoing embodiment of the present application, optionally, the method further includes: determining, by the second determining unit, the frequency domain resource of the enhanced reference signal according to the primary system information block.

In the foregoing embodiment of the present application, optionally, the method further includes: a third determining unit, configured to determine a frequency domain resource of the enhanced reference signal according to a predetermined acquiring rule, where the predetermined acquiring rule is a cell identifier of a cell where the terminal is located The function.

In the above embodiment of the present application, optionally, the time-frequency position of the enhanced reference signal is fixed.

In the foregoing embodiment of the present application, optionally, the fourth determining unit determines the time-frequency position of the enhanced reference signal according to the number of OFDM symbols occupied by one downlink transmission time interval.

In the foregoing embodiment of the present application, optionally, the enhanced reference signal issuing unit is configured to: issue the enhanced reference signal in a full bandwidth.

In the foregoing embodiment of the present application, optionally, the enhanced reference signal issuing unit is configured to: issue the enhanced reference signal in a partial bandwidth, where the partial bandwidth is a predetermined amount of physical medium in the entire bandwidth The bandwidth after the resource block.

In a fifth aspect, the embodiment of the present application provides a downlink transmission detection method, including: acquiring an enhanced reference signal issued by a base station; and detecting, according to the enhanced reference signal, whether the base station occupies a channel for downlink transmission.

In the foregoing embodiment of the present application, optionally, the method further includes: acquiring a basic reference signal that is sent by the base station, where the basic reference signal includes one or more of a common reference signal, a demodulation reference signal, and a synchronization message signal. And the determining, according to the enhanced reference signal, the step of detecting whether the base station occupies a channel for performing downlink transmission according to the enhanced reference signal, specifically, according to the enhanced reference signal and the The basic reference signal jointly detects whether the base station occupies a channel for downlink transmission.

In the foregoing embodiment of the present application, optionally, the method further includes: determining that a downlink transmission time interval where the enhanced reference signal is located is a starting position of a downlink transmission, where the base station occupies a channel for downlink transmission.

In a sixth aspect, the embodiment of the present application further provides a non-transitory computer readable storage medium, where the non-transitory computer readable storage medium stores computer instructions, wherein the computer instructions cause the computer to perform the foregoing downlink of the present application. Transmission detection method.

In a seventh aspect, the embodiment of the present application further provides a computer program product, the computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions, when the program When the instructions are executed by the computer, the computer can execute the above-described downlink transmission detection method of the present application.

In an eighth aspect, the embodiment of the present application provides a terminal, including: a first acquiring unit, acquiring an enhanced reference signal issued by a base station; and a downlink transmission detecting unit, detecting, according to the enhanced reference signal, whether the base station occupies a channel for downlinking transmission.

In the foregoing embodiment of the present application, optionally, the method further includes: acquiring, by the second acquiring unit, a basic reference signal that is sent by the base station, where the basic reference signal includes a cell common reference signal, a demodulation reference signal, and a synchronization message signal. And determining, by the one or more, a resource configuration of the enhanced reference signal, according to the basic reference signal, where the downlink transmission detecting unit is configured to: jointly detect, according to the enhanced reference signal and the basic reference signal, Whether the base station occupies a channel for downlink transmission.

In the foregoing embodiment of the present application, optionally, the method further includes: a start location determining unit, configured to determine, when the base station occupies a channel for downlink transmission, determining that the downlink transmission time interval of the enhanced reference signal is downlink The starting position of the transfer.

In a ninth aspect, the embodiment of the present application provides a terminal, including: a processor; and a memory, where the memory stores an instruction that can be executed by the processor, and the processor is configured to invoke the And executing the following operations: acquiring an enhanced reference signal issued by the base station; and detecting, according to the enhanced reference signal, whether the base station occupies a channel for downlink transmission.

In a tenth aspect, an embodiment of the present application provides a base station, including a transmitter, a receiver, a memory, and a processor respectively connected to a transmitter, a receiver, and a memory, where the memory is stored and executable by the processor. And the processor is configured to invoke the instruction stored by the memory, and perform an operation of: issuing an enhanced reference signal during downlink transmission, for the terminal to determine a channel occupancy condition of the base station according to the enhanced reference signal.

In the above technical solution, for the technical problem that the accuracy of the downlink transmission detection is affected by the fading of the reference signal in the related art, the enhanced reference signal may be released by the base station, and the density of the enhanced reference signal is greater than the original reference signal in the related art. That is to say, in the above technical solution, the terminal can provide a higher reference signal density for the terminal, that is, the coverage enhancement of the reference signal is enhanced, so that the terminal obtains the enhanced reference signal issued by the base station more conveniently and quickly to determine the channel occupancy of the base station. In this case, the terminal facilitates effective downlink transmission detection according to the enhanced reference signal, thereby improving the effectiveness of the communication.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present application. One of ordinary skill in the art can also obtain other drawings based on these drawings without paying for inventive labor.

FIG. 1 is a flowchart of a downlink transmission detecting method according to an embodiment of the present application;

2 to 6 illustrate resource maps of enhanced reference signals based on cell common reference signals;

FIG. 7 shows a resource map of an enhanced reference signal based on a demodulation reference signal;

Figure 8 shows a block diagram of a base station of one embodiment of the present application;

FIG. 9 is a flowchart of a downlink transmission detecting method according to another embodiment of the present application;

Figure 10 is a block diagram showing a terminal of one embodiment of the present application;

Figure 11 is a block diagram showing a terminal of another embodiment of the present application;

Figure 12 shows a block diagram of a base station of another embodiment of the present application.

detailed description

For a better understanding of the technical solutions of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

It should be understood that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present application without departing from the inventive scope are the scope of the present application.

The terms used in the embodiments of the present application are for the purpose of describing particular embodiments only, and are not intended to limit the application. The singular forms "a", "the", and "the"

FIG. 1 shows a flow chart of a downlink transmission detection method of one embodiment of the present application.

As shown in FIG. 1 , a downlink transmission detection method according to an embodiment of the present application includes:

Step 102: Issue an enhanced reference signal during downlink transmission, so that the terminal determines the channel occupancy of the base station according to the enhanced reference signal.

The density of the enhanced reference signal is greater than that of the reference signal in the related art, that is, the above technical solution can provide a higher reference signal density for the terminal, that is, the coverage enhancement of the reference signal is realized, so that the terminal is more convenient and faster. Acquiring the enhanced reference signal issued by the base station to determine the channel occupancy of the base station, and facilitating the terminal to perform effective downlink transmission detection according to the enhanced reference signal, thereby improving the effectiveness of the communication.

In an implementation manner of the present application, the method further includes: releasing a basic reference signal, where the terminal jointly detects, according to the basic reference signal and the enhanced reference signal, whether the base station occupies a channel for downlink transmission, where The basic reference signal includes one or more of a cell common reference signal, a demodulation reference signal, and a synchronization message signal, and a resource configuration of the enhanced reference signal is determined according to the basic reference signal.

The enhanced reference signal is also released on the basis of the basic signal, which greatly increases the density of the reference signal, so that the terminal can obtain the effective reference signal more conveniently and efficiently to determine the channel occupancy of the base station.

In an implementation of the present application, the enhanced reference signal may be used only for downlink transmission detection.

In another implementation of the present application, the enhanced reference signal can be used for both downlink transmission detection and channel estimation.

In an implementation manner of the present application, step 102 specifically includes: transmitting the enhanced reference signal in a first downlink transmission time interval within the transmission opportunity, for the terminal to determine a starting location of the downlink transmission. That is, for a transmission opportunity initiated by the base station, the terminal must determine the starting position of the downlink transmission, and does not transmit the enhanced reference signal during other downlink transmission time intervals within the transmission opportunity.

Of course, in another implementation manner of the present application, step 102 specifically includes: releasing the enhanced reference signal in each downlink transmission time interval within the transmission opportunity, to enhance the possibility that the terminal detects the enhanced reference signal, and improve communication. Success rate.

In an implementation manner of the present application, the method further includes: when the detection signal is issued in a downlink transmission time interval, determining whether the coverage enhancement can be completed within the one downlink transmission time interval; when the determination result is yes, The enhanced reference signal is not issued; when the determination result is no, the process proceeds to step 102 to issue the enhanced reference signal in multiple downlink transmission time intervals.

The detection signal (DRS, Discover signal) includes MF-PSS/SSS (MF system primary/secondary synchronization signal), MF-PBCH (Physical Broadcast Channel), and the like.

On the basis of the foregoing implementation manners, the parameters of the enhanced reference signal may be determined according to three methods: a cell common reference signal, a demodulation reference signal, or a channel state information reference signal. The following three manners are separately described.

First, a signal sequence and a time-frequency position of the enhanced reference signal may be determined according to the cell common reference signal. That is to say, the signal sequence and the time-frequency position of the enhanced reference signal are set based on the relevant parameters of the common reference signal of the cell.

The time-frequency location of the enhanced reference signal is determined, including but not limited to the following:

1. The time-frequency position of the enhanced reference signal is fixed. That is, you can directly obtain a fixed time-frequency position. That is to say, the time-frequency position of the enhanced reference signal does not change with the number of cell common reference signal antenna ports. Further, the time-frequency position of the enhanced reference signal is independent of the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols occupied by the downlink transmission in one TTI.

2. The time-frequency position of the enhanced reference signal can be determined according to the number of OFDM symbols occupied by one downlink transmission time interval. That is to say, the time-frequency position of the enhanced reference signal based on the common reference signal of the cell is changed, and the number of antenna ports according to the common reference signal of the cell has different time-frequency positions, and further, the time-frequency position of the enhanced reference signal also depends on The number of OFDM symbols occupied by downlink transmission in a TTI (Transmission Time Interval) is related.

3. The time-frequency position of the enhanced reference signal may be determined according to the cell identifier of the cell where the terminal is located.

In addition, in an implementation manner of the present application, the time-frequency position of the enhanced reference signal may also be independent of the cell identifier of the cell where the terminal is located.

The process for issuing the enhanced reference signal includes, but is not limited to, the following:

1. In an implementation of the present application, step 102 includes issuing the enhanced reference signal through the same time-frequency location of all antenna ports. That is to say, the enhanced reference signal has no difference in antenna port. That is, at all time-frequency positions for enhancing the reference signal, the time-frequency positions of the enhanced reference signals transmitted by the respective antenna ports are the same, and the signals are also the same. The time-frequency position of the enhanced reference signal is antenna port 0 based on the common reference signal of the cell.

2. The actual number of antenna ports that issue the enhanced reference signal is the same as the actual number of antenna ports that issue the common reference signal for the cell, and step 102 includes issuing different said enhanced references at different locations through different antennas. signal.

Second, the time-frequency position of the enhanced reference signal may also be determined according to the demodulation reference signal. That is, the resource mapping of the enhanced reference signal is based on a Demodulation Reference Signal (DMRS).

The enhanced reference signal based on the demodulation reference signal is transmitted only on a part of the physical resource block within the system bandwidth, depending on the frequency domain resource covering the enhanced common control channel, and the coverage enhanced common control channel is used to send the public control to the terminal. Signaling and/or user-specific control signaling, which occupies frequency domain resources of {8, 16, 32} physical resource blocks. The frequency domain resource information of the coverage enhanced public control channel is obtained through pre-defined rules or system configuration information.

In an implementation manner of the application, the method further includes: in a physical resource block, the time-frequency position of the enhanced reference signal is the same as the time-frequency position of the demodulation reference signal. Specifically, when the enhanced reference signal is obtained based on the demodulation reference signal, the enhanced reference signal, that is, the demodulation reference signal, has the same time-frequency position and demodulation reference signal in one physical resource block.

In an implementation of the present application, step 102 includes: issuing the enhanced reference signal in a first time slot and/or a second time slot of a downlink transmission time interval. In order to reduce power consumption, the enhanced reference signal may be transmitted only in the first time slot of one TTI, and in order to improve the effectiveness of the terminal for enhanced reference signal detection, the enhancement may also be sent in two time slots in one TTI. Reference signal.

In an implementation manner of the application, the number of OFDM symbols occupied by the enhanced reference signal is a predetermined number. The OFDM symbol index occupied by the enhanced reference signal may be fixed regardless of the length of time of the downlink transmission in the current TTI. When the downlink transmission only occupies part of the OFDM symbol, it may cause the partial enhanced reference signal to be untransmitted, that is, only the partial enhanced reference signal is transmitted.

In an implementation manner of the application, the method further includes: determining, according to the length of the current downlink transmission time interval, the number of OFDM symbols occupied by the enhanced reference signal.

That is, the OFDM symbol index occupied by the enhanced reference signal is variable, and the number of OFDM symbols occupied by the enhanced reference signal depends on the actual length of the current TTI. Therefore, when the terminal does not know the length of the downlink transmission in the current TTI, it is necessary to perform blind detection on the time domain position and the frequency domain position of the possible enhanced reference signal.

In an implementation manner of the application, the frequency domain resource size of the enhanced reference signal is a predetermined size. For example, the frequency domain resource of the enhanced reference signal is fixed to 8 or 16 physical resource blocks.

In another implementation manner of the present application, the frequency domain resource of the enhanced reference signal may be determined according to the number of OFDM symbols occupied by the enhanced reference signal in one downlink transmission time interval and the density of each physical resource block. Wherein the enhanced reference signal has a constant transmission density over a downlink transmission time interval.

Specifically, in order to ensure the density of the reference signal is enhanced within one TTI, the frequency domain resource size of the enhanced reference signal may be changed according to a change criterion, which is to ensure that the transmission density of the enhanced reference signal in one TTI is the same, That is to say, it is necessary to ensure that the density of the enhanced reference signal issued by the base station is constant for the terminal to perform detection. Therefore, the frequency domain resource of the enhanced reference signal can be determined according to the number of OFDM symbols occupied by the enhanced reference signal in one TTI, the density within each physical resource block, and the like. For example, the enhanced reference signal needs to be transmitted on 4 OFDM symbols within one TTI and transmitted only within one basic frequency domain resource. If a TTI can only support 2 OFDM for enhanced reference signal transmission, the frequency domain resources of the enhanced reference signal are doubled to ensure that the transmission density of the enhanced reference signal in one TTI is the same.

In one embodiment, when the frequency domain resource of the coverage enhanced common control channel is greater than the frequency domain resource size required to enhance the reference signal, the enhanced reference signal is transmitted over all of the frequency domain resources of the coverage enhanced common control channel.

In another embodiment, when the frequency domain resource of the coverage enhanced common control channel is larger than the frequency domain resource size required for the enhanced reference signal, the enhanced reference signal is only performed in part of the frequency domain resource covering the enhanced common control channel. send. The part of the frequency domain resource may be obtained based on a specific rule, or may be obtained through signaling configuration.

Third, the time-frequency position of the enhanced reference signal may also be determined according to a Channel State Information-Reference Signal (CSI-RS). Here, the CSI-RS is non-zero power (NZP). In one cell, two sets of NZP CSI-RSs can be configured as enhanced reference signals.

For determining the frequency reference resource of the enhanced reference signal according to the enhanced reference signal determined by the cell common reference signal, the demodulation reference signal, or the channel state information reference signal, the following includes:

1. Determine frequency domain resources of the enhanced reference signal according to system configuration information, such as a Master Information Block (MIB) and system information SIB1. Among them, MIB and SIB1 are system information applied in the coverage enhancement scenario of the unlicensed band.

The frequency domain resource of the enhanced reference signal may be determined according to a predetermined acquisition rule, where the predetermined acquisition rule is a cell identifier (cell ID) and a transmission time interval index of a cell where the terminal is located. , a function of the size of the frequency domain resource. For example, the rule can have the following expression:

表示小区cell ID；

表示下行系统带宽；M是增强参考信号频域资源的大小，表示为PRB对的个数。 Here, R _i represents an ith PRB pair of the frequency domain resource of the enhanced reference signal;

Indicates the cell cell ID;

Indicates the downlink system bandwidth; M is the size of the frequency domain resource of the enhanced reference signal, expressed as the number of PRB pairs.

For the enhanced reference signal determined according to the three methods of the cell common reference signal, the demodulation reference signal or the channel state information reference signal, the enhanced reference signal may be released in the full bandwidth to increase the successful release of the enhanced reference signal. Rate, the enhanced reference signal may also be distributed in a part of the bandwidth, and the part of the bandwidth is the bandwidth after removing the intermediate predetermined number of physical resource blocks in the full bandwidth, and the implementation manner is consistent with the foregoing partial description based on the CRS determining the enhanced reference signal. , will not repeat them here.

In an implementation manner of the application, the method further includes: determining, when the enhanced reference signal is sent, whether the enhanced reference signal conflicts with a public signal or a user-specific signal; when determining a sending conflict, performing a corresponding conflict processing manner .

Specifically, when the enhanced reference signal is sent, if the time-frequency resource of the enhanced reference signal conflicts with other signals, the base station will punctify the enhanced reference signal or other existing signals at the time-frequency position of the part, that is, not corresponding. The enhanced reference signal or the other signal is transmitted at the time-frequency location. Here, the other existing signals include a common signal and a user-specific signal, wherein the common signal includes a primary synchronization signal/secondary synchronization signal, a physical broadcast channel and its coverage enhancement signal, a primary synchronization signal/secondary synchronization signal of the MF system, and coverage enhancement thereof. One or more of a signal, a Physical Downlink Control Channel (PDCCH), a Physical Downlink Shared Channel (PDSCH) that carries common data, and a common control channel that covers enhancement.

Here, the coverage enhanced public control channel is a set of common time-frequency resources for transmitting some common control information and/or user-specific control information to the terminal, wherein the common control information includes a shared physical downlink control channel, and the user-specific signal mainly refers to A physical downlink shared channel carrying user-specific data, a demodulation reference signal, a cell common reference signal, and the like.

The following provides a variety of specific conflict handling scenarios and conflict handling methods.

1. When the enhanced reference signal and the common signal collide, the base station does not transmit the enhanced reference signal.

2. When the enhanced reference signal and the common signal collide, the base station does not transmit the PDSCH for the PDSCH carrying the common data, and sends an enhanced reference signal at the corresponding time-frequency position, that is, the base station punctured the PDSCH carrying the common data. For other common signals other than PDSCH, the enhanced reference signal is punctured.

3. When the enhanced reference signal and the coverage enhanced common control channel conflict, the base station does not transmit the enhanced reference signal on the time-frequency resource carrying the common PDCCH (cPDCCH), but at the time-frequency position of transmitting other control information, Then punch the signal of other control information.

4. When the enhanced reference signal and the coverage enhanced common control channel collide, on the time-frequency resource carrying the common PDCCH, and when carrying the common control information for scheduling the common data information (for example, paging, system information, and the like) On the frequency resource, the base station does not send the enhanced reference signal, but on the time-frequency resources of other non-common control information, it is used to transmit the enhanced reference signal, that is, the signal of other non-common control information is punctured.

5. When the enhanced reference signal collides with the user-specific signal, the base station transmits an enhanced reference signal, that is, puncturing the user-specific signal.

6. When the enhanced reference signal collides with the user-specific signal, the base station does not transmit the enhanced reference signal, that is, punctifies the enhanced reference signal and transmits the user-specific signal at the conflicting location.

7. When the enhanced reference signal and the demodulation reference signal, the cell common reference signal, and the like in the user-specific signal collide, the base station does not transmit the enhanced reference signal, that is, punctifies the enhanced reference signal. For the PDSCH carrying the user-specific data, the base station sends an enhanced reference signal, that is, puncturing the PDSCH.

8. When the enhanced reference signal and the demodulation reference signal in the user specific signal collide with the non-zero power cell common reference signal, the base station does not transmit the enhanced reference signal. For the zero-power cell common reference signal in the user-specific signal and the PDSCH carrying the user-specific data, the base station transmits an enhanced reference signal, that is, puncturing the user-specific signal.

For the content of any of the above embodiments, the following implementation manners are also possible:

2 to 6 show resource maps of enhanced reference signals based on cell common reference signals.

In FIG. 2, the enhanced reference signal is transmitted only on the first OFDM symbol (OFDM symbol 1) in one slot and the third symbol (OFDM symbol 5) in the same slot, in one physical resource. The frequency domain location in the block is the same as the CRS (Cell-specific Reference Signal) of the current cell.

In Figure 3, the enhanced reference signal is transmitted in both time slots within one TTI, and the frequency domain position in one physical resource block is the same as the cell common reference signal of the current cell.

In FIG. 4, the enhanced reference signal is transmitted on the last two OFDM symbols in the first slot within one TTI, and the frequency domain position in one physical resource block is the same as the cell common reference signal of the current cell.

In FIG. 5, the enhanced reference signal is transmitted in the first two OFDMs of the OFDM symbol of the second transport cell common reference signal in the first time slot within one TTI, ie, OFDM symbols 2 and 3 as shown. . The frequency domain location of the enhanced reference signal in one physical resource block is the same as the cell common reference signal of the current cell.

In Figure 6, the enhanced reference signal is transmitted in both time slots of one TTI. Within each time slot, the enhanced reference signal is transmitted within the first two OFDMs of the OFDM symbol of the second transmit cell common reference signal in each time slot. The frequency domain location of the enhanced reference signal in one physical resource block is the same as the cell common reference signal of the current cell.

It should be added that FIG. 2 and FIG. 3 are applicable to the case where the number of antenna ports of the common reference signal of the cell is not more than 2, and the number of antenna ports applicable to the common reference signal of the cell in FIG. 4, FIG. 5 and FIG. 6 is {1, 2 , 4} scenes.

The base station may send the enhanced reference signal according to the actual number of antenna ports of the cell common reference signal of the system, or the base station sends the enhanced reference signal according to the scenario that the number of antenna ports of the cell common reference signal is 4.

In FIG. 2 to FIG. 6, in the first time slot of one TTI, the enhanced reference signal may conflict with the resource positions of the primary synchronization signal/secondary synchronization signal and the primary synchronization signal/secondary synchronization signal of the MF system. In this case, the enhanced reference signal is not transmitted in the middle 6 physical resource blocks to avoid collision with the primary synchronization signal/secondary synchronization signal. The second time slot may not be able to transmit the enhanced reference signal due to the limited transmission time of the downlink, in which case the enhanced reference signal is not transmitted.

In addition, the enhanced reference signal may have a resource conflict with the PDCCH, the enhanced PDCCH, the primary synchronization signal/secondary synchronization signal of the MF system, and the coverage enhancement of the physical broadcast channel of the MF system. When there is a conflict, the enhanced reference signal is not at the corresponding location. The signal is transmitted, and the corresponding position is used to enhance the transmission of the reference signal, and the other conflicting channels are punctured.

FIG. 7 shows a resource map of an enhanced reference signal based on a demodulation reference signal.

As shown in FIG. 7, the enhanced reference signal is transmitted on the last two OFDM symbols of the first slot based on the port 7 and port 9 of the demodulation reference signal.

An embodiment of the present application also provides a non-transitory computer readable storage medium storing computer instructions that cause the computer to perform any of the method embodiments described above The method provided.

An embodiment of the present application also provides a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions, when the program instructions are When executed, the computer can perform the methods provided by any of the above method embodiments.

Figure 8 shows a block diagram of a base station of one embodiment of the present application.

As shown in FIG. 8, the base station 800 of an embodiment of the present application includes an enhanced reference signal issuing unit 802, and issues an enhanced reference signal during downlink transmission, so that the terminal determines the channel occupancy of the base station 800 according to the enhanced reference signal. .

In the foregoing embodiment of the present application, optionally, the method further includes: a joint issuing unit, releasing a basic reference signal, where the terminal jointly detects, according to the basic reference signal and the enhanced reference signal, whether the base station 800 occupies a channel Performing downlink transmission, where the basic reference signal includes one or more of a cell common reference signal, a demodulation reference signal, and a synchronization message signal, and a resource configuration of the enhanced reference signal is determined according to the basic reference signal.

In the foregoing embodiment of the present application, the enhanced reference signal issuance unit is specifically configured to: issue the enhanced reference signal in a first downlink transmission time interval within the transmission opportunity, where the terminal determines the downlink The starting position of the transfer.

In the foregoing embodiment of the present application, optionally, the enhanced reference signal issuing unit is specifically configured to: issue the enhanced reference signal in each downlink transmission time interval within the transmission opportunity.

In the foregoing embodiment of the present application, optionally, the pre-judging unit determines whether the coverage enhancement can be completed within the one downlink transmission time interval when the detection signal is issued in a downlink transmission time interval, where When the determination result is yes, the enhanced reference signal is not issued, and when the determination result is no, the step of issuing the enhanced reference signal is entered, so that the enhanced reference signal is issued in multiple downlink transmission time intervals.

In the foregoing embodiment of the present application, optionally, the method further includes: a first determining unit, determining a signal sequence and a time-frequency position of the enhanced reference signal according to the cell common reference signal.

In the foregoing embodiment of the present application, optionally, the method further includes: a fifth determining unit, determining a time-frequency position of the enhanced reference signal according to a cell identifier of a cell where the terminal is located.

In the foregoing embodiment of the present application, optionally, the enhanced reference signal issuing unit is configured to: issue the enhanced reference signal by using the same time-frequency position of all antenna ports.

In the foregoing embodiment of the present application, optionally, the actual number of antenna ports that issue the enhanced reference signal is the same as the actual number of antenna ports that issue the common reference signal of the cell, and the enhanced reference signal issuance unit is used. : Different said enhanced reference signals are issued at different locations by different antennas.

In the foregoing embodiment of the present application, optionally, the method further includes: a sixth determining unit, determining a time-frequency position of the enhanced reference signal according to the demodulation reference signal.

In the foregoing embodiment of the present application, optionally, the method further includes: in a physical resource block, the time-frequency position of the enhanced reference signal is the same as the time-frequency position of the demodulation reference signal.

In the foregoing embodiment of the present application, optionally, the enhanced reference signal issuing unit is configured to: issue the enhanced reference signal in a first time slot and/or a second time slot of a downlink transmission time interval.

In the above embodiment of the present application, optionally, the number of OFDM symbols occupied by the enhanced reference signal is a predetermined number.

In the foregoing embodiment of the present application, optionally, the method further includes: a seventh determining unit, determining, according to the length of the current downlink transmission time interval, the number of OFDM symbols occupied by the enhanced reference signal.

In the above embodiment of the present application, optionally, the frequency domain resource size of the enhanced reference signal is a predetermined size.

In the foregoing embodiment of the present application, optionally, the method further includes: an eighth determining unit, determining, according to the number of OFDM symbols occupied by the enhanced reference signal in one downlink transmission time interval and the density of each physical resource block, The frequency domain resource of the enhanced reference signal is described, wherein the enhanced reference signal has a constant transmission density during a downlink transmission time interval.

In the foregoing embodiment of the present application, optionally, the method further includes: a ninth determining unit, determining a time-frequency position of the enhanced reference signal according to the channel state information reference signal.

In the foregoing embodiment of the present application, optionally, the method further includes: a conflict determining unit, when transmitting the enhanced reference signal, determining whether the enhanced reference signal conflicts with a public signal or a user-specific signal; and the conflict processing unit determines When a conflict is sent, the corresponding conflict handling mode is executed.

In the foregoing embodiment of the present application, optionally, the method further includes: determining, by the second determining unit, the frequency domain resource of the enhanced reference signal according to the primary system information block.

In the foregoing embodiment of the present application, optionally, the method further includes: a third determining unit, configured to determine a frequency domain resource of the enhanced reference signal according to a predetermined acquiring rule, where the predetermined acquiring rule is a cell identifier of a cell where the terminal is located The function.

In the above embodiment of the present application, optionally, the time-frequency position of the enhanced reference signal is fixed.

In the foregoing embodiment of the present application, optionally, the fourth determining unit determines the time-frequency position of the enhanced reference signal according to the number of OFDM symbols occupied by one downlink transmission time interval.

In the foregoing embodiment of the present application, optionally, the enhanced reference signal issuing unit is configured to: issue the enhanced reference signal in a full bandwidth.

In the foregoing embodiment of the present application, optionally, the enhanced reference signal issuing unit is configured to: issue the enhanced reference signal in a partial bandwidth, where the partial bandwidth is a predetermined amount of physical medium in the entire bandwidth The bandwidth after the resource block.

FIG. 9 is a flow chart showing a downlink transmission detecting method of another embodiment of the present application.

As shown in FIG. 9, the downlink transmission detection method of another embodiment of the present application includes:

Step 902: Acquire an enhanced reference signal issued by the base station.

Step 904: Detect, according to the enhanced reference signal, whether the base station occupies a channel for downlink transmission.

For the technical problem that the reference signal issued by the base station in the related art is easy to fade, the enhanced reference signal may be released by the base station, and the density of the enhanced reference signal is greater than the original reference signal in the related art, that is, the terminal may be the terminal in the foregoing technical solution. Providing a higher reference signal density, that is, the coverage enhancement of the reference signal is realized, so that the terminal can obtain the enhanced reference signal issued by the base station more conveniently and quickly, thereby determining the channel occupancy of the base station and improving the effectiveness of the communication.

In the foregoing embodiment of the present application, optionally, the method further includes: acquiring a basic reference signal that is sent by the base station, where the basic reference signal includes one or more of a common reference signal, a demodulation reference signal, and a synchronization message signal. The resource configuration of the enhanced reference signal is determined according to the basic reference signal. Step 904 specifically includes: jointly detecting, according to the enhanced reference signal and the basic reference signal, whether the base station occupies a channel for downlink transmission.

The enhanced reference signal is also released on the basis of the basic signal, which greatly increases the density of the reference signal, so that the terminal can obtain the effective reference signal more conveniently and efficiently to determine the channel occupancy of the base station.

In the foregoing embodiment of the present application, optionally, the method further includes: determining that a downlink transmission time interval where the enhanced reference signal is located is a starting position of a downlink transmission, where the base station occupies a channel for downlink transmission.

The enhanced reference signal is issued during a first downlink transmission time interval within the transmission opportunity for the terminal to determine a starting location for the downlink transmission. That is, for a transmission opportunity initiated by the base station, the terminal must determine the starting position of the downlink transmission, and does not transmit the enhanced reference signal during other downlink transmission time intervals within the transmission opportunity.

An embodiment of the present application also provides a non-transitory computer readable storage medium storing computer instructions that cause the computer to perform any of the method embodiments described above The method provided.

An embodiment of the present application also provides a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions when the program instructions are When the computer is executed, the computer can perform the method provided by any of the above method embodiments.

Figure 10 shows a block diagram of a terminal of one embodiment of the present application.

As shown in FIG. 10, the terminal 1000 of an embodiment of the present application includes: a first acquiring unit 1002, acquiring an enhanced reference signal issued by a base station; and a downlink transmission detecting unit 1004, detecting, according to the enhanced reference signal, whether the base station is The channel is occupied for downlink transmission.

In addition, not shown in FIG. 10, the terminal 1000 further includes a second acquisition unit and a home position determining unit.

The second acquiring unit is configured to acquire a basic reference signal that is sent by the base station, where the basic reference signal includes one or more of a cell common reference signal, a demodulation reference signal, and a synchronization message signal, and the resource of the enhanced reference signal The configuration is determined based on the basic reference signal. The downlink transmission detecting unit 1004 is specifically configured to: jointly detect, according to the enhanced reference signal and the basic reference signal, whether the base station occupies a channel for downlink transmission.

The start position determining unit is configured to determine, when the base station occupies a channel for downlink transmission, that the downlink transmission time interval where the enhanced reference signal is located is a start position of the downlink transmission.

Figure 11 shows a block diagram of a terminal of another embodiment of the present application.

As shown in FIG. 11, the terminal 1100 includes: a processor 1104; and a memory 1102. The memory 1102 stores instructions executable by the processor 1104, and the processor 1104 is configured to invoke an instruction stored in the memory 1102 to perform the following operations:

Obtaining an enhanced reference signal issued by the base station; and detecting, according to the enhanced reference signal, whether the base station occupies a channel for downlink transmission.

Figure 12 shows a block diagram of a base station of another embodiment of the present application.

As shown in FIG. 12, base station 1200 includes a transmitter 1222, a receiver 1221, a memory 1223, and a processor 1224 coupled to a transmitter 1222, a receiver 1221, and a memory 1223, respectively, in which a memory 1223 is stored for execution by the processor 1224. The instructions are, and the processor 1224 is configured to invoke the instructions stored in the memory 1223 to perform the following operations:

The enhanced reference signal is transmitted during the downlink transmission, so that the terminal determines the channel occupancy of the base station according to the enhanced reference signal.

The technical solution of the present application is described in detail with reference to the accompanying drawings. The technical solution of the present application can provide a higher reference signal density for the terminal, that is, the coverage enhancement of the reference signal is realized, so that the terminal can obtain the base station more conveniently and quickly. The enhanced reference signal is issued to determine the channel occupancy of the base station, so that the terminal can perform effective downlink transmission detection according to the enhanced reference signal, thereby improving the effectiveness of the communication.

Depending on the context, the word "if" as used herein may be interpreted as "when" or "when" or "in response to determining" or "in response to detecting." Similarly, depending on the context, the phrase "if determined" or "if detected (conditions or events stated)" may be interpreted as "when determined" or "in response to determination" or "when detected (stated condition or event) "Time" or "in response to a test (condition or event stated)".

It should be noted that the terminals involved in the embodiments of the present application may include, but are not limited to, a personal computer (PC), a personal digital assistant (PDA), a wireless handheld device, a tablet computer, and a tablet computer. Mobile phones, MP3 players, MP4 players, etc.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner. 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 executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.

The above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform the methods of the various embodiments of the present application. Part of the steps. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

The above is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc., which are made within the spirit and principles of the present application, should be included in the present application. Within the scope of protection.

Claims (60)

A downlink transmission detection method, comprising: The enhanced reference signal is sent during the downlink transmission, so that the terminal determines the channel occupancy of the base station according to the enhanced reference signal. The method for detecting a downlink transmission according to claim 1, further comprising: And a basic reference signal is sent, for the terminal to jointly detect, according to the basic reference signal and the enhanced reference signal, whether the base station occupies a channel for downlink transmission, where the basic reference signal includes a cell common reference signal, and a demodulation reference And one or more of a signal and a synchronization message signal, the resource configuration of the enhanced reference signal being determined according to the base reference signal. The downlink transmission detection method according to claim 1, wherein the step of issuing the enhanced reference signal comprises: The enhanced reference signal is issued during a first downlink transmission time interval within the transmission opportunity for the terminal to determine a starting location for the downlink transmission. The downlink transmission detection method according to claim 1, wherein the step of issuing the enhanced reference signal comprises: The enhanced reference signal is issued during each downlink transmission time interval within the transmission opportunity. The method for detecting a downlink transmission according to claim 1, further comprising: When a sounding signal is issued within a downlink transmission time interval, it is determined whether the coverage enhancement can be completed within the one downlink transmission time interval; When the judgment result is yes, the enhanced reference signal is not issued; When the determination result is no, the step of issuing the enhanced reference signal is entered to issue the enhanced reference signal in multiple downlink transmission time intervals. The method for detecting a downlink transmission according to claim 2, further comprising: Determining a signal sequence and a time-frequency location of the enhanced reference signal based on the cell common reference signal. The method for detecting a downlink transmission according to claim 6, further comprising: Determining a time-frequency location of the enhanced reference signal according to a cell identifier of a cell in which the terminal is located. The downlink transmission detection method according to claim 6, wherein the step of issuing an enhanced reference signal comprises: The enhanced reference signal is issued through the same time-frequency location of all antenna ports. The downlink transmission detection method according to claim 6, wherein the actual number of antenna ports that issue the enhanced reference signal is the same as the actual number of antenna ports that issue the common reference signal of the cell, and The step of issuing an enhanced reference signal includes: Different said enhanced reference signals are issued at different locations by different antennas. The method for detecting a downlink transmission according to claim 2, further comprising: Determining a time-frequency position of the enhanced reference signal based on the demodulation reference signal. The method for detecting a downlink transmission according to claim 10, further comprising: Within one physical resource block, the time-frequency location of the enhanced reference signal is the same as the time-frequency location of the demodulation reference signal. The downlink transmission detection method according to claim 11, wherein the step of issuing an enhanced reference signal comprises: The enhanced reference signal is issued in a first time slot and/or a second time slot of a downlink transmission time interval. The downlink transmission detecting method according to claim 10, characterized in that The number of OFDM symbols occupied by the enhanced reference signal is a predetermined number. The method for detecting a downlink transmission according to claim 10, further comprising: The number of OFDM symbols occupied by the enhanced reference signal is determined according to the length of the current downlink transmission time interval. The downlink transmission detecting method according to claim 10, characterized in that The frequency domain resource size of the enhanced reference signal is a predetermined size. The method for detecting a downlink transmission according to claim 10, further comprising: Determining a frequency domain resource of the enhanced reference signal according to the number of OFDM symbols occupied by the enhanced reference signal in one downlink transmission time interval and the density of each physical resource block, wherein the enhanced reference signal is transmitted in a downlink The transmission density during the time interval is constant. The method for detecting a downlink transmission according to claim 2, further comprising: Determining a time-frequency location of the enhanced reference signal based on the channel state information reference signal. The method for detecting a downlink transmission according to claim 1, further comprising: Determining whether the enhanced reference signal collides with a common signal or a user-specific signal when transmitting the enhanced reference signal; When the transmission conflict is determined, the corresponding conflict handling mode is executed. The method for detecting a downlink transmission according to any one of claims 1 to 18, further comprising: Determining a frequency domain resource of the enhanced reference signal according to the primary system information block. The method for detecting a downlink transmission according to any one of claims 1 to 18, further comprising: And determining, according to a predetermined acquisition rule, a frequency domain resource of the enhanced reference signal, where the predetermined acquisition rule is a function of a cell identifier of a cell where the terminal is located. The downlink transmission detecting method according to any one of claims 1 to 18, characterized in that The time-frequency position of the enhanced reference signal is fixed. The downlink transmission detecting method according to any one of claims 1 to 18, characterized in that The time-frequency position of the enhanced reference signal is determined according to the number of OFDM symbols occupied by one downlink transmission time interval. The downlink transmission detection method according to any one of claims 1 to 18, wherein the step of issuing the enhanced reference signal comprises: The enhanced reference signal is issued within full bandwidth. The downlink transmission detection method according to any one of claims 1 to 18, wherein the step of issuing an enhanced reference signal comprises: The enhanced reference signal is issued within a portion of the bandwidth, wherein the partial bandwidth is a bandwidth after removing a predetermined number of physical resource blocks in the middle of the full bandwidth. A base station, comprising: The enhanced reference signal issuing unit issues an enhanced reference signal during downlink transmission, so that the terminal determines the channel occupancy of the base station according to the enhanced reference signal. The base station according to claim 25, further comprising: And the joint issuing unit, the basic reference signal is sent, for the terminal to jointly detect, according to the basic reference signal and the enhanced reference signal, whether the base station occupies a channel for downlink transmission, where the basic reference signal includes a cell common reference signal And demodulating one or more of the reference signal and the synchronization message signal, the resource configuration of the enhanced reference signal being determined according to the basic reference signal. The base station according to claim 25, wherein the enhanced reference signal issuing unit is specifically configured to: The enhanced reference signal is issued during a first downlink transmission time interval within the transmission opportunity for the terminal to determine a starting location for the downlink transmission. The base station according to claim 25, wherein the enhanced reference signal issuing unit is specifically configured to: The enhanced reference signal is issued during each downlink transmission time interval within the transmission opportunity. The base station according to claim 25, further comprising: The pre-judging unit determines whether the coverage enhancement can be completed within the one downlink transmission time interval when the detection signal is issued in a downlink transmission time interval, wherein when the determination result is yes, the enhanced reference signal is not released. When the determination result is no, the step of issuing the enhanced reference signal is entered to issue the enhanced reference signal in multiple downlink transmission time intervals. The base station according to claim 26, further comprising: The first determining unit determines a signal sequence and a time-frequency position of the enhanced reference signal according to the cell common reference signal. The base station according to claim 30, further comprising: The fifth determining unit determines the time-frequency position of the enhanced reference signal according to the cell identifier of the cell where the terminal is located. The base station according to claim 30, wherein the enhanced reference signal issuing unit is configured to: The enhanced reference signal is issued through the same time-frequency location of all antenna ports. The base station according to claim 30, wherein the actual number of antenna ports that issue the enhanced reference signal is the same as the actual number of antenna ports that issue the common reference signal of the cell, and The enhanced reference signal issuing unit is configured to: Different said enhanced reference signals are issued at different locations by different antennas. The base station according to claim 26, further comprising: And a sixth determining unit, configured to determine a time-frequency position of the enhanced reference signal according to the demodulation reference signal. The base station according to claim 34, further comprising: Within one physical resource block, the time-frequency location of the enhanced reference signal is the same as the time-frequency location of the demodulation reference signal. The base station according to claim 35, wherein the enhanced reference signal issuing unit is configured to: The enhanced reference signal is issued in a first time slot and/or a second time slot of a downlink transmission time interval. The base station according to claim 38, characterized in that The number of OFDM symbols occupied by the enhanced reference signal is a predetermined number. The base station according to claim 34, further comprising: The seventh determining unit determines the number of OFDM symbols occupied by the enhanced reference signal according to the length of the current downlink transmission time interval. The base station according to claim 34, characterized in that The frequency domain resource size of the enhanced reference signal is a predetermined size. The base station according to claim 34, further comprising: The eighth determining unit determines a frequency domain resource of the enhanced reference signal according to the number of OFDM symbols occupied by the enhanced reference signal in one downlink transmission time interval and the density of each physical resource block, where the enhanced reference The transmission density of the signal during a downlink transmission time interval is constant. The base station according to claim 25, further comprising: And a ninth determining unit, configured to determine a time-frequency position of the enhanced reference signal according to the channel state information reference signal. The base station according to claim 25, further comprising: a collision determining unit, when transmitting the enhanced reference signal, determining whether the enhanced reference signal collides with a public signal or a user-specific signal; The conflict processing unit executes the corresponding conflict processing mode when determining the sending conflict. The base station according to any one of claims 25 to 42, further comprising: The second determining unit determines the frequency domain resource of the enhanced reference signal according to the primary system information block. The base station according to any one of claims 25 to 42, further comprising: And a third determining unit, configured to determine a frequency domain resource of the enhanced reference signal according to a predetermined acquiring rule, where the predetermined acquiring rule is a function of a cell identifier of a cell where the terminal is located. A base station according to any one of claims 25 to 42, wherein The time-frequency position of the enhanced reference signal is fixed. The base station according to any one of claims 25 to 42, further comprising: And a fourth determining unit, determining a time-frequency position of the enhanced reference signal according to the number of OFDM symbols occupied by one downlink transmission time interval. The base station according to any one of claims 25 to 42, wherein the enhanced reference signal issuing unit is configured to: The enhanced reference signal is issued within full bandwidth. The base station according to any one of claims 25 to 42, wherein the enhanced reference signal issuing unit is configured to: The enhanced reference signal is issued within a portion of the bandwidth, wherein the partial bandwidth is a bandwidth after removing a predetermined number of physical resource blocks in the middle of the full bandwidth. A downlink transmission detection method, comprising: Obtaining an enhanced reference signal issued by the base station; And detecting, according to the enhanced reference signal, whether the base station occupies a channel for downlink transmission. The method for detecting a downlink transmission according to claim 49, further comprising: And acquiring, by the base station, a basic reference signal, where the basic reference signal includes one or more of a cell common reference signal, a demodulation reference signal, and a synchronization message signal, where a resource configuration of the enhanced reference signal is according to the basic reference. Signal determination The step of detecting whether the base station occupies a channel for downlink transmission according to the enhanced reference signal includes: And jointly detecting, according to the enhanced reference signal and the basic reference signal, whether the base station occupies a channel for downlink transmission. The method for detecting a downlink transmission according to claim 49, further comprising: And determining that the downlink transmission time interval in which the enhanced reference signal is located is a starting position of the downlink transmission, in a case that the base station occupies a channel for downlink transmission. A terminal, comprising: a first acquiring unit, acquiring an enhanced reference signal issued by the base station; The downlink transmission detecting unit detects, according to the enhanced reference signal, whether the base station occupies a channel for downlink transmission. The terminal according to claim 52, further comprising: a second acquiring unit, acquiring a basic reference signal issued by the base station, where the basic reference signal includes one or more of a common reference signal, a demodulation reference signal, and a synchronization message signal, and resource configuration of the enhanced reference signal Determined according to the basic reference signal; The downlink transmission detecting unit is specifically configured to: And jointly detecting, according to the enhanced reference signal and the basic reference signal, whether the base station occupies a channel for downlink transmission. The terminal according to claim 52, further comprising: The initial position determining unit determines that the downlink transmission time interval in which the enhanced reference signal is located is the starting position of the downlink transmission, in the case that the base station occupies the channel for downlink transmission. A terminal, comprising: Processor; and Memory, The memory stores instructions executable by the processor, and the processor is configured to invoke the instructions stored by the memory to perform the following operations: Obtaining an enhanced reference signal issued by the base station; And detecting, according to the enhanced reference signal, whether the base station occupies a channel for downlink transmission. A base station, characterized in that Including a transmitter, a receiver, a memory, and a processor connected to the transmitter, the receiver, and the memory, respectively. The memory stores instructions executable by the processor, and the processor is configured to invoke the instructions stored by the memory to perform the following operations: The enhanced reference signal is sent during the downlink transmission, so that the terminal determines the channel occupancy of the base station according to the enhanced reference signal. A non-transitory computer readable storage medium storing computer instructions for causing the computer to perform any of claims 1-24 Methods. A computer program product, comprising: a computing program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions, when the program instructions are executed by a computer, The computer performs the method of any of claims 1-24. A non-transitory computer readable storage medium, wherein the non-transitory computer readable storage medium stores computer instructions for causing the computer to perform any one of claims 49-51 Methods. A computer program product, comprising: a computing program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions, when the program instructions are executed by a computer, The computer performs the method of any of claims 49-51.

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