CN106789826B - Downlink transmission detection method, base station and terminal - Google Patents
Downlink transmission detection method, base station and terminal Download PDFInfo
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Abstract
The invention provides a downlink transmission detection method, a base station and a terminal, wherein the downlink transmission detection method comprises the following steps: and issuing an enhanced reference signal in the downlink transmission process so that the terminal can determine the channel occupation condition of the base station according to the enhanced reference signal. According to the technical scheme, higher reference signal density can be provided for the terminal, the coverage enhancement of the reference signal is realized, the terminal can acquire the enhanced reference signal issued by the base station more conveniently and quickly to determine the channel occupation condition of the base station, so that the terminal can smoothly perform work such as channel monitoring/detection, channel estimation and the like according to the enhanced reference signal, the terminal can conveniently perform effective downlink transmission detection according to the enhanced reference signal, and the effectiveness of communication is improved.
Description
[ technical field ] A method for producing a semiconductor device
The present invention relates to the field of communications technologies, and in particular, to a downlink transmission detection method, a base station, and a terminal.
[ background of the invention ]
The MulteFire technology is a radio access technology that extends L TE (L ong Term Evolution ) to an unlicensed band, which may be referred to as MF for short, and in the technology, a carrier in the unlicensed band may independently provide services without the help of a carrier in the licensed band.
At present, in order to enable a plurality of unlicensed band devices (such as Wi-Fi devices) to fairly occupy an unlicensed band channel and avoid mutual interference between the unlicensed band devices, an L BT (L listen Before Talk) mechanism similar to a Wi-Fi carrier monitoring technology is introduced into an mf (multefire) physical layer, when a base station or a terminal monitors that the unlicensed band channel is occupied, that is, when L BT fails, a signal must not be sent, and when the unlicensed band channel is idle, that is, when L BT succeeds, a signal is sent.
However, for some unauthorized frequency band devices located in some special geographic locations, such as water meters and electricity meters located in basements, the channel fading at the geographic location is large, and the signal penetration loss is also large, wherein the reference signal issued by the base station is easy to fade, so that it is difficult for the terminal to perform operations such as channel monitoring/detection and channel estimation according to the effective reference signal, and further, the terminal is affected to perform downlink transmission detection.
Therefore, how to improve the effectiveness of downlink transmission detection performed by the terminal becomes a technical problem to be solved urgently at present.
[ summary of the invention ]
The embodiment of the invention provides a downlink transmission detection method, a base station and a terminal, aiming at solving the technical problem that the accuracy of downlink transmission detection of the terminal is influenced due to reference signal fading in the related technology, and the coverage of a reference signal can be enhanced, so that the terminal can smoothly perform work such as channel monitoring/detection, channel estimation and the like according to the reference signal, and thus downlink transmission detection is effectively performed.
In a first aspect, an embodiment of the present invention provides a downlink transmission detection method, including: and issuing an enhanced reference signal in the downlink transmission process so that the terminal can determine the channel occupation condition of the base station according to the enhanced reference signal.
In the above embodiment of the present invention, optionally, the method further includes: and issuing a basic reference signal for the terminal to jointly detect whether the base station occupies a channel for downlink transmission according to the basic reference signal and the enhanced reference signal, wherein the basic reference signal comprises one or more of a cell common reference signal, a demodulation reference signal and a synchronization message signal.
In the above embodiment of the present invention, optionally, the step of issuing the enhanced reference signal specifically includes: and issuing the enhanced reference signal in a first downlink transmission time interval in the transmission opportunity so as to enable the terminal to determine the starting position of downlink transmission.
In the above embodiment of the present invention, optionally, the step of issuing the enhanced reference signal specifically includes: the enhanced reference signal is issued in each downlink transmission time interval within a transmission opportunity.
In the above embodiment of the present invention, optionally, the method further includes: when a detection signal is issued in a downlink transmission time interval, judging whether coverage enhancement can be completed in the downlink transmission time interval; when the judgment result is yes, the enhanced reference signal is not issued; and when the judgment result is negative, entering the step of issuing the enhanced reference signal so as to issue the enhanced reference signal in a plurality of downlink transmission time intervals.
In the above embodiment of the present invention, optionally, the method further includes: and determining the signal sequence and the time-frequency position of the enhanced reference signal according to the cell common reference signal.
In the above embodiment of the present invention, optionally, the method further includes: and determining the time-frequency position of the enhanced reference signal according to the cell identification of the cell in which the terminal is positioned.
In the above embodiment of the present invention, optionally, the step of issuing the enhanced reference signal includes: and issuing the enhanced reference signal through the same time-frequency position of all antenna ports.
In the above embodiment of the present invention, optionally, the actual number of antenna ports issuing the enhanced reference signals is the same as the actual number of antenna ports issuing the cell common reference signals, and the step of issuing the enhanced reference signals includes: issuing different ones of the enhanced reference signals at different locations through different antennas.
In the above embodiment of the present invention, optionally, the method further includes: and determining the time-frequency position of the enhanced reference signal according to the demodulation reference signal.
In the above embodiment of the present invention, optionally, the method further includes: and in one 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 above embodiment of the present invention, optionally, the step of issuing the enhanced reference signal includes: and issuing the enhanced reference signal in the first time slot and/or the second time slot of a downlink transmission time interval.
In the above embodiments of the present invention, optionally, the number of OFDM symbols occupied by the enhanced reference signal is a predetermined number.
In the above embodiment of the present invention, optionally, the method further includes: and determining the number of OFDM symbols occupied by the enhanced reference signal according to the length of the current downlink transmission time interval.
In the above embodiments of the present invention, optionally, the frequency domain resource size of the enhanced reference signal is a predetermined size.
In the above embodiment of the present invention, optionally, the method further includes: and determining the frequency domain resources of the enhanced reference signals according to the number of OFDM symbols occupied by the enhanced reference signals in one downlink transmission time interval and the density of each physical resource block, wherein the transmission density of the enhanced reference signals in one downlink transmission time interval is constant.
In the above embodiment of the present invention, optionally, the method further includes: and determining the time-frequency position of the enhanced reference signal according to the channel state information reference signal.
In the above embodiment of the present invention, optionally, the method further includes: determining whether the enhanced reference signal collides with a common signal or a user-specific signal while transmitting the enhanced reference signal; and when the transmission conflict is determined, executing a corresponding conflict processing mode.
In the above embodiment of the present invention, optionally, the method further includes: and determining the frequency domain resource of the enhanced reference signal according to the main system information block.
In the above embodiment of the present invention, optionally, the method further includes: and determining the frequency domain resource of the enhanced reference signal according to a preset acquisition rule, wherein the preset acquisition rule is a function of the cell identifier of the cell in which the terminal is positioned.
In the foregoing embodiment of the present invention, optionally, the time-frequency position of the enhanced reference signal is fixed.
In the above embodiment of the present invention, 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 above embodiment of the present invention, optionally, the step of issuing the enhanced reference signal specifically includes: the enhanced reference signal is published within a full bandwidth.
In the above embodiment of the present invention, optionally, the step of issuing the enhanced reference signal includes: and issuing the enhanced reference signal in a partial bandwidth, wherein the partial bandwidth is the bandwidth of the full bandwidth except the middle predetermined number of physical resource blocks.
In a second aspect, an embodiment of the present invention provides a base station, including: and the enhanced reference signal issuing unit issues an enhanced reference signal in the downlink transmission process so that the terminal can determine the channel occupation condition of the base station according to the enhanced reference signal.
In the above embodiment of the present invention, optionally, the method further includes: and the joint release unit is used for releasing a basic reference signal so that the terminal can jointly detect whether the base station occupies a channel for downlink transmission according to the basic reference signal and the enhanced reference signal, wherein the basic reference signal comprises one or more of a cell common reference signal, a demodulation reference signal and a synchronization message signal.
In the above embodiment of the present invention, optionally, the enhanced reference signal issuing unit is specifically configured to: and issuing the enhanced reference signal in a first downlink transmission time interval in the transmission opportunity so as to enable the terminal to determine the starting position of downlink transmission.
In the above embodiment of the present invention, optionally, the enhanced reference signal issuing unit is specifically configured to: the enhanced reference signal is issued in each downlink transmission time interval within a transmission opportunity.
In the above embodiment of the present invention, optionally, the method further includes: and the pre-judging unit is used for judging whether coverage enhancement can be finished in one downlink transmission time interval or not when the sounding signal is issued in the downlink transmission time interval, wherein the enhanced reference signal is not issued when the judging result is yes, and the step of issuing the enhanced reference signal is carried out when the judging result is no so as to issue the enhanced reference signal in a plurality of downlink transmission time intervals.
In the above embodiment of the present invention, optionally, the method further includes: and the first determining unit is used for determining the signal sequence and the time-frequency position of the enhanced reference signal according to the cell common reference signal.
In the above embodiment of the present invention, optionally, the method further includes: and a fifth determining unit, configured to determine a time-frequency location of the enhanced reference signal according to the cell identifier of the cell in which the terminal is located.
In the above embodiment of the present invention, optionally, the enhanced reference signal issuing unit is configured to: and issuing the enhanced reference signal through the same time-frequency position of all antenna ports.
In the above embodiment of the present invention, optionally, the actual number of antenna ports issuing the enhanced reference signals is the same as the actual number of antenna ports issuing the cell common reference signals, and the enhanced reference signal issuing unit is configured to: issuing different ones of the enhanced reference signals at different locations through different antennas.
In the above embodiment of the present invention, optionally, the method further includes: and the sixth determining unit is used for determining the time-frequency position of the enhanced reference signal according to the demodulation reference signal.
In the above embodiment of the present invention, optionally, the method further includes: and in one 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 above embodiment of the present invention, optionally, the enhanced reference signal issuing unit is configured to: and issuing the enhanced reference signal in the first time slot and/or the second time slot of a downlink transmission time interval.
In the above embodiments of the present invention, optionally, the number of OFDM symbols occupied by the enhanced reference signal is a predetermined number.
In the above embodiment of the present invention, optionally, the method further includes: and a seventh determining unit, configured to determine, 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 embodiments of the present invention, optionally, the frequency domain resource size of the enhanced reference signal is a predetermined size.
In the above embodiment of the present invention, optionally, the method further includes: an eighth determining unit, configured to determine, 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, a frequency domain resource of the enhanced reference signal, where a transmission density of the enhanced reference signal in one downlink transmission time interval is constant.
In the above embodiment of the present invention, optionally, the method further includes: a ninth determining unit, configured to determine a time-frequency location of the enhanced reference signal according to the channel state information reference signal.
In the above embodiment of the present invention, optionally, the method further includes: a collision determination unit that determines whether the enhanced reference signal collides with a common signal or a user-specific signal when transmitting the enhanced reference signal; and the conflict processing unit executes a corresponding conflict processing mode when the transmission conflict is determined.
In the above embodiment of the present invention, optionally, the method further includes: and the second determining unit is used for determining the frequency domain resource of the enhanced reference signal according to the main system information block.
In the above embodiment of the present invention, optionally, the method further includes: and a third determining unit, configured to determine the frequency domain resource of the enhanced reference signal according to a predetermined acquisition rule, where the predetermined acquisition rule is a function of a cell identifier of a cell in which the terminal is located.
In the above embodiments of the present invention, optionally, the time-frequency position of the enhanced reference signal is fixed.
In the foregoing embodiment of the present invention, 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 above embodiment of the present invention, optionally, the enhanced reference signal issuing unit is configured to: the enhanced reference signal is published within a full bandwidth.
In the above embodiment of the present invention, optionally, the enhanced reference signal issuing unit is configured to: and issuing the enhanced reference signal in a partial bandwidth, wherein the partial bandwidth is the bandwidth of the full bandwidth except the middle predetermined number of physical resource blocks.
In a third aspect, an embodiment of the present invention provides a downlink transmission detection method, including: acquiring an enhanced reference signal issued by a base station; and detecting whether the base station occupies a channel for downlink transmission or not according to the enhanced reference signal.
In the above embodiment of the present invention, optionally, the method further includes: acquiring a basic reference signal issued by the base station, wherein the basic reference signal comprises one or more of a cell common reference signal, a demodulation reference signal and a synchronization message signal; the step of detecting whether the base station occupies a channel for downlink transmission according to the enhanced reference signal specifically includes: and jointly detecting whether the base station occupies a channel for downlink transmission or not according to the enhanced reference signal and the basic reference signal.
In the above embodiment of the present invention, optionally, the method further includes: and under the condition that the base station is detected to occupy the channel for downlink transmission, determining the downlink transmission time interval of the enhanced reference signal as the initial position of the downlink transmission.
In a fourth aspect, an embodiment of the present invention provides a terminal, including: the first acquisition unit is used for acquiring the enhanced reference signal issued by the base station; and the downlink transmission detection unit detects whether the base station occupies a channel for downlink transmission according to the enhanced reference signal.
In the above embodiment of the present invention, optionally, the method further includes: a second obtaining unit, configured to obtain a basic reference signal issued 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; the downlink transmission detection unit is specifically configured to: and jointly detecting whether the base station occupies a channel for downlink transmission or not according to the enhanced reference signal and the basic reference signal.
In the above embodiment of the present invention, optionally, the method further includes: and the initial position determining unit is used for determining the downlink transmission time interval of the enhanced reference signal as the initial position of downlink transmission under the condition that the base station is detected to occupy the channel for downlink transmission.
In a fifth aspect, an embodiment of the present invention provides a terminal, including: a processor; and a memory having stored therein instructions executable by the processor, and the processor is configured to invoke the instructions stored by the memory to perform the following operations: acquiring an enhanced reference signal issued by a base station; and detecting whether the base station occupies a channel for downlink transmission or not according to the enhanced reference signal.
In a sixth aspect, an embodiment of the present invention provides a base station, including a transmitter, a receiver, a memory, and a processor respectively connected to the transmitter, the receiver, and the memory, where the memory stores instructions executable by the processor, and the processor is configured to invoke the instructions stored in the memory to perform the following operations: and issuing an enhanced reference signal in the downlink transmission process so that the terminal can determine the channel occupation condition of the base station according to the enhanced reference signal.
The technical scheme can issue the enhanced reference signal through the base station, and the density of the enhanced reference signal is greater than that of the original reference signal in the related art, that is, the technical scheme can provide higher reference signal density for the terminal, namely, the coverage enhancement of the reference signal is realized, so that the terminal can more conveniently and quickly acquire the enhanced reference signal issued by the base station to determine the channel occupation condition of the base station, and therefore, the terminal can smoothly perform work such as channel monitoring/detection, channel estimation and the like according to the enhanced reference signal, the terminal can conveniently perform effective downlink transmission detection according to the enhanced reference signal, and the effectiveness of communication is improved.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
Fig. 1 shows a flow chart of a downlink transmission detection method according to an embodiment of the invention;
fig. 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;
FIG. 8 shows a block diagram of a base station of one embodiment of the invention;
fig. 9 shows a flow chart of a downlink transmission detection method according to another embodiment of the present invention;
FIG. 10 shows a block diagram of a terminal of one embodiment of the invention;
fig. 11 shows a block diagram of a terminal of another embodiment of the present invention;
fig. 12 shows a block diagram of a base station of another embodiment of the invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
Fig. 1 shows a flowchart of a downlink transmission detection method according to an embodiment of the present invention.
As shown in fig. 1, a downlink transmission detection method according to an embodiment of the present invention includes:
102, issuing an enhanced reference signal in a downlink transmission process so that a terminal can determine the channel occupation condition of a base station according to the enhanced reference signal.
The density of the enhanced reference signal is greater than that of the original reference signal in the related art, that is, in the above technical scheme, higher reference signal density can be provided for the terminal, that is, coverage enhancement of the reference signal is realized, so that the terminal can more conveniently and quickly acquire the enhanced reference signal issued by the base station to determine the channel occupation condition of the base station, and thus the terminal can smoothly perform work such as channel monitoring/detection, channel estimation and the like according to the enhanced reference signal, the terminal can conveniently perform effective downlink transmission detection according to the enhanced reference signal, and the effectiveness of communication is improved.
In one implementation manner of the present invention, the method further includes: and issuing a basic reference signal for the terminal to jointly detect whether the base station occupies a channel for downlink transmission according to the basic reference signal and the enhanced reference signal, 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 the enhanced reference signal is also issued on the basis of issuing the basic signal, so that the density of the reference signal is greatly increased, and the terminal can more conveniently and effectively acquire the effective reference signal to determine the channel occupation condition of the base station.
In one implementation of the present invention, the enhanced reference signal may be used only for downlink transmission detection.
In another implementation manner of the invention, the enhanced reference signal can be used for downlink transmission detection and channel estimation.
In an implementation manner of the present invention, step 102 specifically includes: and issuing the enhanced reference signal in a first downlink transmission time interval in the transmission opportunity so as to enable the terminal to determine the starting position of 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 in other downlink transmission time intervals in the transmission opportunity, no enhanced reference signal is sent.
Of course, in another implementation manner of the present invention, step 102 specifically includes: and issuing the enhanced reference signal in each downlink transmission time interval in the transmission opportunity so as to enhance the possibility that the terminal detects the enhanced reference signal and improve the communication success rate.
In one implementation manner of the present invention, the method further includes: when a detection signal is issued in advance in a downlink transmission time interval, judging whether coverage enhancement can be completed in the downlink transmission time interval; when the judgment result is yes, the enhanced reference signal is not issued; and if the determination result is negative, entering step 102, so as to issue the enhanced reference signal in a plurality of downlink transmission time intervals.
The sounding signal (DRS) includes MF-PSS/SSS (MF system primary/secondary synchronization signal), MF-PBCH (Physical Broadcast Channel), and the like.
On the basis of the above implementation manners, the parameters of the enhanced reference signal may be determined according to three manners, namely, a cell common reference signal, a demodulation reference signal, or a channel state information reference signal, which are described below.
First, a signal sequence and a time-frequency location of the enhanced reference signal may be determined according to the cell common reference signal. That is, the signal sequence and time-frequency position of the enhanced reference signal are set according to the related parameters of the cell common reference signal.
Determining the time-frequency position of the enhanced reference signal includes, but is not limited to, the following ways:
1, the time-frequency position of the enhanced reference signal is fixed. I.e. a fixed time-frequency position can be directly obtained. That is, the time-frequency position of the enhanced reference signal does not change with the number of antenna ports of the cell common reference signal. Further, the time-frequency position of the enhanced reference signal is independent of the number of OFDM (Orthogonal frequency division Multiplexing) symbols occupied by 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, the Time-frequency position of the enhanced reference signal based on the cell common reference signal is changed, and different Time-frequency positions exist according to the number of antenna ports of the cell common reference signal, and further, the Time-frequency position of the enhanced reference signal is also related to the number of OFDM symbols occupied by downlink Transmission in one TTI (Transmission Time Interval).
And 3, determining the time-frequency position of the enhanced reference signal according to the cell identification of the cell in which the terminal is positioned.
In addition, in an implementation manner of the present invention, the time-frequency position of the enhanced reference signal may also be unrelated to the cell identifier of the cell in which the terminal is located.
For the process of issuing the enhanced reference signal, the following ways are included, but not limited to:
in one implementation of the present invention, step 102 includes: and issuing the enhanced reference signal through the same time-frequency position of all antenna ports. That is, the enhanced reference signal has no difference in antenna ports. That is, at all time-frequency positions for the enhanced reference signals, the time-frequency positions of the enhanced reference signals transmitted by the antenna ports are the same, and the signals are also the same. Wherein the time-frequency position of the enhanced reference signal is based on antenna port 0 of the cell common reference signal.
2, the actual number of antenna ports issuing the enhanced reference signals is the same as the actual number of antenna ports issuing the cell common reference signals, and step 102 comprises: issuing different ones of the enhanced reference signals at different locations through different antennas.
Secondly, the time-frequency position of the enhanced reference signal can be determined according to the demodulation reference signal. I.e., the resource mapping of the enhanced Reference Signal is based on the Demodulation Reference Signal (DMRS).
The enhanced reference signal based on the demodulation reference signal is transmitted only on a part of physical resource blocks within the system bandwidth, depending on the frequency domain resource of a coverage enhanced common control channel, which is used for transmitting common control signaling and/or user specific control signaling to the terminal, and the occupied frequency domain resource is {8, 16, 32} physical resource blocks. The frequency domain resource information of the coverage enhanced common control channel is obtained through a predefined rule, or system configuration information.
In one implementation manner of the present invention, the method further includes: and in one 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 obtaining the enhanced reference signal based on the demodulation reference signal, the enhanced reference signal, that is, the demodulation reference signal, has the same time-frequency position within one physical resource block as the demodulation reference signal.
In one implementation of the present invention, step 102 comprises: and issuing the enhanced reference signal in the first time slot and/or the 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 slot of one TTI, and in order to improve the effectiveness of the terminal in detecting the enhanced reference signal, the enhanced reference signal may be transmitted in both slots of one TTI.
In one implementation manner of the present invention, 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 time length of downlink transmission in the current TTI. When downlink transmission only occupies part of OFDM symbols, it may result in part of the enhanced reference signal not being transmitted, i.e. only part of the enhanced reference signal is transmitted.
In one implementation manner of the present invention, the method further includes: and determining the number of OFDM symbols occupied by the enhanced reference signal according to the length of the current downlink transmission time interval.
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 time length of downlink transmission in the current TTI, blind detection needs to be performed on the time domain position and the frequency domain position of a possible enhanced reference signal.
In one implementation manner of the present invention, 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 invention, 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, where the transmission density of the enhanced reference signal in one downlink transmission time interval is constant.
Specifically, in order to ensure the density of the enhanced reference signals in one TTI, the frequency domain resource size of the enhanced reference signals may be changed according to a change criterion, where the change criterion is to ensure that the transmission density of the enhanced reference signals in one TTI is the same, that is, the density of the enhanced reference signals issued by the base station is ensured to be constant, so that the terminal can perform detection. The frequency domain resources of the enhanced reference signal may be determined according to the number of OFDM symbols occupied by the enhanced reference signal within one TTI, the density within each physical resource block, and the like. For example, the enhanced reference signal needs to be transmitted over 4 OFDM symbols within one TTI and only within one basic frequency domain resource. If a certain TTI can only support 2 OFDM for the transmission of the enhanced reference signal, the frequency domain resource of the enhanced reference signal is doubled, so as to ensure that the transmission density of the enhanced reference signal in a TTI is the same.
In one embodiment, when the frequency domain resources covering the enhanced common control channel are larger than the size of the frequency domain resources required for the enhanced reference signal, the enhanced reference signal is transmitted within the entire frequency domain resources covering the enhanced common control channel.
In another embodiment, when the frequency domain resources covering the enhanced common control channel are larger than the size of the frequency domain resources required for the enhanced reference signal, the enhanced reference signal is transmitted only in a part of the frequency domain resources covering the enhanced common control channel. The partial frequency domain resources may be obtained based on a specific rule, or may be obtained through signaling configuration.
Thirdly, the time-frequency position of the enhanced Reference Signal can be determined according to the Channel State Information-Reference Signal (CSI-RS). Here, the CSI-RS is non-zero (NZP). In one cell, 2 sets of NZP CSI-RS may be configured as enhanced reference signals.
For the enhanced reference signal determined according to the cell common reference signal, the demodulation reference signal or the channel state information reference signal, when determining the frequency domain resource of the enhanced reference signal, the following methods are included, but not limited to:
1, determining frequency domain resources of the enhanced reference signals according to system configuration Information, such as a main system Information Block (MIB) and a system Information SIB 1. The MIB and the SIB1 are both system information applied in a coverage enhancement scenario of an unlicensed frequency band.
And 2, determining the frequency domain resource of the enhanced reference signal according to a predetermined acquisition rule, wherein the predetermined acquisition rule is a function of a cell Identification (cell ID) of a cell in which the terminal is located, a transmission time interval (transmission time interval) index, and a frequency domain resource size. For example, the rule may be expressed as follows:
here, RiAn ith PRB pair representing an enhanced reference signal frequency domain resource;
representing a cell ID;
representing a downlink system bandwidth; m is the size of the enhanced reference signal frequency domain resource, and is represented as the number of PRB pairs.
For the enhanced reference signal determined according to the three manners of the cell common reference signal, the demodulation reference signal or the channel state information reference signal, the enhanced reference signal may be issued within the full bandwidth to increase the issuing success rate of the enhanced reference signal, or the enhanced reference signal may be issued within a partial bandwidth, where the partial bandwidth is the bandwidth excluding the middle predetermined number of physical resource blocks in the full bandwidth, and the implementation manner of the enhanced reference signal is consistent with that described in the foregoing portion for determining the enhanced reference signal based on the CRS, and is not described herein again.
In one implementation manner of the present invention, the method further includes: determining whether the enhanced reference signal collides with a common signal or a user-specific signal while transmitting the enhanced reference signal; and when the transmission conflict is determined, executing a corresponding conflict processing mode.
Specifically, when sending the enhanced reference signal, if the time-frequency resource of the enhanced reference signal collides with other signals, the base station may puncture (punture) the enhanced reference signal or other existing signals at the part of the time-frequency position, that is, the enhanced reference signal or the other signals are not sent at the corresponding time-frequency position. Here, the other existing signals include one or more of a common signal and a user-specific signal, where the common signal includes a primary synchronization signal/secondary synchronization signal, a Physical broadcast Channel and a coverage enhancement signal thereof, a primary synchronization signal/secondary synchronization signal and a coverage enhancement signal thereof of the MF system, a Physical Downlink Control Channel (PDCCH), a Physical Downlink Shared Channel (PDSCH) carrying common data, and a coverage enhancement common Control Channel.
Here, the coverage-enhanced common control channel is a group of common time-frequency resources for transmitting some common control information and/or user-specific control information to the terminal, where the common control information includes a shared physical downlink control channel, and the user-specific signal mainly refers to a physical downlink shared channel for carrying user-specific data, a demodulation reference signal, a cell common reference signal, and the like.
Various specific conflict handling scenarios and conflict handling approaches are provided below.
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 collides with the common signal, the base station does not send the PDSCH carrying the common data, and sends the enhanced reference signal at the corresponding time-frequency position, that is, the base station punctures the PDSCH carrying the common data. And puncturing the enhanced reference signal for other common signals except the PDSCH.
3, when the enhanced reference signal collides with the common control channel covering the enhanced, the base station does not transmit the enhanced reference signal on the time-frequency resource carrying the common PDCCH (common PDCCH, cpcch), and punctures the signals of other control information on the time-frequency position transmitting other control information.
4, when the enhanced reference signal and the coverage enhanced common control channel collide, the base station does not transmit the enhanced reference signal on the time-frequency resource carrying the common PDCCH and the time-frequency resource carrying the common control information of scheduling common data information (e.g. data information such as paging, system information, etc.), and is used for transmitting the enhanced reference signal, i.e. a signal puncturing other non-common control information, on the time-frequency resource carrying other non-common control information.
And 5, when the enhanced reference signal and the user specific signal collide, the base station transmits the enhanced reference signal, namely punctures the user specific signal.
And 6, when the enhanced reference signal and the user-specific signal collide, the base station does not transmit the enhanced reference signal, namely punctures the enhanced reference signal, and transmits the user-specific signal at the collision position.
And 7, when the enhanced reference signal collides with a demodulation reference signal, a cell common reference signal and the like in the user specific signal, the base station does not transmit the enhanced reference signal, namely punctures the enhanced reference signal. And for the PDSCH carrying user specific data, the base station transmits an enhanced reference signal, i.e., punctures the PDSCH.
And 8, when the enhanced reference signal collides with the demodulation reference signal and the non-zero power cell common reference signal in the user specific signal, the base station does not transmit the enhanced reference signal. And for the zero-power cell common reference signal in the user specific signal and the PDSCH carrying the user specific data, the base station sends an enhanced reference signal, namely punctures the user specific signal.
For the content of any of the above embodiments, there may also be implementations as follows:
fig. 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 last symbol (OFDM symbol 5) in the same slot, and the frequency domain position in one physical resource block is the same as the CRS (Cell-specific Reference Signal) of the current Cell.
In fig. 3, the enhanced reference signal is transmitted in both slots of a TTI, and the frequency domain position in a physical resource block is the same as the cell common reference signal of the current cell.
In fig. 4, the enhanced reference signals are transmitted on the last two OFDM symbols in the first slot of a 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 OFDM symbols of the second transmitting cell common reference signal in the first slot of one TTI, i.e., OFDM symbols 2 and 3 as shown. The frequency domain position of the enhanced reference signal in one physical resource block is the same as the cell common reference signal of the current cell.
In fig. 6, the enhanced reference signal is transmitted in both slots of one TTI. In each slot, the enhanced reference signal is transmitted in the first two OFDM of the second transmission cell common reference signal OFDM symbol in each slot. The frequency domain position 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 that the number of antenna ports of the cell common reference signal is not greater than 2, and fig. 4, fig. 5 and fig. 6 are applicable to the scenario that the number of antenna ports of the cell common reference signal is {1, 2, 4 }.
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 based on a scenario that the number of antenna ports of the cell common reference signal is 4.
In fig. 2 to 6, in the first slot of one TTI, the enhanced reference signal may collide with the resource locations of the primary/secondary synchronization signals and the MF system, in which case, the enhanced reference signal is not transmitted in the middle 6 physical resource blocks to avoid collision with the primary/secondary synchronization signals. The second slot may not be able to transmit the enhanced reference signal because it is limited by the downlink transmission time, in which case the enhanced reference signal is not transmitted.
In addition, the enhanced reference signal may have resource conflict with coverage enhancement of a PDCCH, an enhanced PDCCH, a primary synchronization signal/secondary synchronization signal of an MF system, and a physical broadcast channel of the MF system, and when there is conflict, the enhanced reference signal does not transmit a signal at a corresponding position, and the corresponding position is used for transmitting the enhanced reference signal, so as to puncture other conflicting channels.
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 port 7 and port 9 of the demodulation reference signal.
Fig. 8 shows a block diagram of a base station of an embodiment of the invention.
As shown in fig. 8, a base station 800 according to an embodiment of the present invention includes an enhanced reference signal issuing unit 802, which issues an enhanced reference signal in a downlink transmission process, so that a terminal determines a channel occupation situation of the base station 800 according to the enhanced reference signal.
In the above embodiment of the present invention, optionally, the method further includes: a joint issuing unit, configured to issue a basic reference signal, so that the terminal jointly detects whether the base station 800 occupies a channel for downlink transmission according to the basic reference signal and the enhanced 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.
In the above embodiment of the present invention, optionally, the enhanced reference signal issuing unit is specifically configured to: and issuing the enhanced reference signal in a first downlink transmission time interval in the transmission opportunity so as to enable the terminal to determine the starting position of downlink transmission.
In the above embodiment of the present invention, optionally, the enhanced reference signal issuing unit is specifically configured to: the enhanced reference signal is issued in each downlink transmission time interval within a transmission opportunity.
In the above embodiment of the present invention, optionally, the method further includes: and the pre-judging unit is used for judging whether coverage enhancement can be finished in one downlink transmission time interval or not when the sounding signal is issued in the downlink transmission time interval, wherein the enhanced reference signal is not issued when the judging result is yes, and the step of issuing the enhanced reference signal is carried out when the judging result is no so as to issue the enhanced reference signal in a plurality of downlink transmission time intervals.
In the above embodiment of the present invention, optionally, the method further includes: and the first determining unit is used for determining the signal sequence and the time-frequency position of the enhanced reference signal according to the cell common reference signal.
In the above embodiment of the present invention, optionally, the method further includes: and a fifth determining unit, configured to determine a time-frequency location of the enhanced reference signal according to the cell identifier of the cell in which the terminal is located.
In the above embodiment of the present invention, optionally, the enhanced reference signal issuing unit is configured to: and issuing the enhanced reference signal through the same time-frequency position of all antenna ports.
In the above embodiment of the present invention, optionally, the actual number of antenna ports issuing the enhanced reference signals is the same as the actual number of antenna ports issuing the cell common reference signals, and the enhanced reference signal issuing unit is configured to: issuing different ones of the enhanced reference signals at different locations through different antennas.
In the above embodiment of the present invention, optionally, the method further includes: and the sixth determining unit is used for determining the time-frequency position of the enhanced reference signal according to the demodulation reference signal.
In the above embodiment of the present invention, optionally, the method further includes: and in one 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 above embodiment of the present invention, optionally, the enhanced reference signal issuing unit is configured to: and issuing the enhanced reference signal in the first time slot and/or the second time slot of a downlink transmission time interval.
In the above embodiments of the present invention, optionally, the number of OFDM symbols occupied by the enhanced reference signal is a predetermined number.
In the above embodiment of the present invention, optionally, the method further includes: and a seventh determining unit, configured to determine, 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 embodiments of the present invention, optionally, the frequency domain resource size of the enhanced reference signal is a predetermined size.
In the above embodiment of the present invention, optionally, the method further includes: an eighth determining unit, configured to determine, 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, a frequency domain resource of the enhanced reference signal, where a transmission density of the enhanced reference signal in one downlink transmission time interval is constant.
In the above embodiment of the present invention, optionally, the method further includes: a ninth determining unit, configured to determine a time-frequency location of the enhanced reference signal according to the channel state information reference signal.
In the above embodiment of the present invention, optionally, the method further includes: a collision determination unit that determines whether the enhanced reference signal collides with a common signal or a user-specific signal when transmitting the enhanced reference signal; and the conflict processing unit executes a corresponding conflict processing mode when the transmission conflict is determined.
In the above embodiment of the present invention, optionally, the method further includes: and the second determining unit is used for determining the frequency domain resource of the enhanced reference signal according to the main system information block.
In the above embodiment of the present invention, optionally, the method further includes: and a third determining unit, configured to determine the frequency domain resource of the enhanced reference signal according to a predetermined acquisition rule, where the predetermined acquisition rule is a function of a cell identifier of a cell in which the terminal is located.
In the above embodiments of the present invention, optionally, the time-frequency position of the enhanced reference signal is fixed.
In the foregoing embodiment of the present invention, 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 above embodiment of the present invention, optionally, the enhanced reference signal issuing unit is configured to: the enhanced reference signal is published within a full bandwidth.
In the above embodiment of the present invention, optionally, the enhanced reference signal issuing unit is configured to: and issuing the enhanced reference signal in a partial bandwidth, wherein the partial bandwidth is the bandwidth of the full bandwidth except the middle predetermined number of physical resource blocks.
Fig. 9 shows a flowchart of a downlink transmission detection method according to another embodiment of the present invention.
As shown in fig. 9, a downlink transmission detection method according to another embodiment of the present invention includes:
Aiming at the technical problem that a reference signal issued by a base station in the related technology is easy to fade, an enhanced reference signal can be issued by the base station, and the density of the enhanced reference signal is greater than that of an original reference signal in the related technology, that is, higher reference signal density can be provided for a terminal in the above technical scheme, that is, coverage enhancement of the reference signal is realized, so that the terminal can more conveniently and quickly acquire the enhanced reference signal issued by the base station to determine the channel occupation condition of the base station, and thus, the terminal can smoothly perform work such as channel monitoring/detection, channel estimation and the like according to the enhanced reference signal, and the effectiveness of communication is improved.
In the above embodiment of the present invention, optionally, the method further includes: acquiring a basic reference signal issued by the base station, wherein the basic reference signal comprises one or more of a cell common reference signal, a demodulation reference signal and a synchronization message signal; step 904 specifically includes: and jointly detecting whether the base station occupies a channel for downlink transmission or not according to the enhanced reference signal and the basic reference signal.
And the enhanced reference signal is also issued on the basis of issuing the basic signal, so that the density of the reference signal is greatly increased, and the terminal can more conveniently and effectively acquire the effective reference signal to determine the channel occupation condition of the base station.
In the above embodiment of the present invention, optionally, the method further includes: and under the condition that the base station is detected to occupy the channel for downlink transmission, determining the downlink transmission time interval of the enhanced reference signal as the initial position of the downlink transmission.
And issuing the enhanced reference signal in a first downlink transmission time interval in the transmission opportunity so as to enable the terminal to determine the starting position of 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 in other downlink transmission time intervals in the transmission opportunity, no enhanced reference signal is sent.
Fig. 10 shows a block diagram of a terminal of an embodiment of the invention.
As shown in fig. 10, a terminal 1000 according to an embodiment of the present invention includes: a first obtaining unit 1002, configured to obtain an enhanced reference signal issued by a base station; a downlink transmission detecting unit 1004, configured to detect whether the base station occupies a channel for downlink transmission according to the enhanced reference signal.
In addition, not shown in fig. 10, terminal 1000 further comprises a second acquisition unit and a start position determination unit.
The second obtaining unit is configured to obtain a basic reference signal issued 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. The downlink transmission detecting unit 1004 is specifically configured to: and jointly detecting whether the base station occupies a channel for downlink transmission or not according to the enhanced reference signal and the basic reference signal.
The initial position determining unit is configured to determine, when it is detected that the base station occupies the channel for downlink transmission, that the downlink transmission time interval in which the enhanced reference signal is located is an initial position of downlink transmission.
Fig. 11 shows a block diagram of a terminal of another embodiment of the present invention.
As shown in fig. 11, the terminal 1100 includes: a processor 1104; and a memory 1102, wherein the memory 1102 stores instructions executable by the processor 1104, and the processor 1104 is configured to call the instructions stored in the memory 1102 to perform the following operations:
acquiring an enhanced reference signal issued by a base station; and detecting whether the base station occupies a channel for downlink transmission or not according to the enhanced reference signal.
Fig. 12 shows a block diagram of a base station of another embodiment of the invention.
As shown in fig. 12, the base station 1200 comprises a transmitter 1222, a receiver 1221, a memory 1223, and a processor 1224 connected to the transmitter 1222, the receiver 1221, and the memory 1223, respectively, wherein the memory 1223 stores instructions executable by the processor 1224, and the processor 1224 is configured to call the memory 1223 to store instructions to perform the following operations:
and issuing the enhanced reference signal in the downlink transmission process so that the terminal can determine the channel occupation condition of the base station according to the enhanced reference signal.
The technical scheme of the invention is described in detail above with reference to the accompanying drawings, and by the technical scheme of the invention, higher reference signal density can be provided for the terminal, that is, coverage enhancement of the reference signal is realized, so that the terminal can more conveniently and quickly acquire the enhanced reference signal issued by the base station to determine the channel occupation condition of the base station, and thus the terminal can smoothly perform operations such as channel monitoring/detection, channel estimation and the like according to the enhanced reference signal, the terminal can conveniently perform effective downlink transmission detection according to the enhanced reference signal, and the effectiveness of communication is improved.
The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It should be noted that the terminal according to the embodiment of the present invention may include, but is not limited to, a Personal Computer (PC), a Personal Digital Assistant (PDA), a wireless handheld device, a Tablet Computer (Tablet Computer), a mobile phone, an MP3 player, an MP4 player, and the like.
In the embodiments provided in the present invention, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions in actual implementation, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a Processor (Processor) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (44)
1. A downlink transmission detection method is characterized by comprising the following steps:
issuing an enhanced reference signal in a downlink transmission process so that a terminal can determine the channel occupation condition of a base station according to the enhanced reference signal;
issuing a basic reference signal for the terminal to jointly detect whether the base station occupies a channel for downlink transmission according to the basic reference signal and the enhanced reference signal,
wherein the base reference signal comprises one or more of a cell common reference signal, a demodulation reference signal, and a synchronization message signal;
further comprising:
determining a signal sequence and a time-frequency position of the enhanced reference signal according to the cell common reference signal;
determining the time-frequency position of the enhanced reference signal according to the cell identification of the cell in which the terminal is positioned;
the step of issuing an enhanced reference signal includes:
issuing the enhanced reference signal through the same time-frequency positions of all antenna ports;
or,
the actual number of antenna ports issuing the enhanced reference signals is the same as the actual number of antenna ports issuing the cell common reference signals, an
The step of issuing an enhanced reference signal includes:
issuing different ones of the enhanced reference signals at different locations through different antennas.
2. The downlink transmission detection method according to claim 1, wherein the step of issuing the enhanced reference signal specifically includes:
and issuing the enhanced reference signal in a first downlink transmission time interval in the transmission opportunity so as to enable the terminal to determine the starting position of downlink transmission.
3. The downlink transmission detection method according to claim 1, wherein the step of issuing the enhanced reference signal specifically includes:
the enhanced reference signal is issued in each downlink transmission time interval within a transmission opportunity.
4. The downlink transmission detection method according to claim 1, further comprising:
when a detection signal is issued in a downlink transmission time interval, judging whether coverage enhancement can be completed in the downlink transmission time interval;
when the judgment result is yes, the enhanced reference signal is not issued;
and when the judgment result is negative, entering the step of issuing the enhanced reference signal so as to issue the enhanced reference signal in a plurality of downlink transmission time intervals.
5. The downlink transmission detection method according to claim 1, further comprising:
and determining the time-frequency position of the enhanced reference signal according to the demodulation reference signal.
6. The downlink transmission detection method according to claim 5, further comprising:
and in one 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.
7. The downlink transmission detecting method according to claim 6, wherein the step of issuing the enhanced reference signal includes:
and issuing the enhanced reference signal in the first time slot and/or the second time slot of a downlink transmission time interval.
8. The downlink transmission detection method of claim 5,
the number of OFDM symbols occupied by the enhanced reference signal is a predetermined number.
9. The downlink transmission detection method according to claim 5, further comprising:
and determining the number of OFDM symbols occupied by the enhanced reference signal according to the length of the current downlink transmission time interval.
10. The downlink transmission detection method of claim 5,
the frequency domain resource size of the enhanced reference signal is a predetermined size.
11. The downlink transmission detection method according to claim 5, further comprising:
and determining the frequency domain resources of the enhanced reference signals according to the number of OFDM symbols occupied by the enhanced reference signals in one downlink transmission time interval and the density of each physical resource block, wherein the transmission density of the enhanced reference signals in one downlink transmission time interval is constant.
12. The downlink transmission detection method according to claim 1, further comprising:
and determining the time-frequency position of the enhanced reference signal according to the channel state information reference signal.
13. The downlink transmission detection method according to claim 1, further comprising:
determining whether the enhanced reference signal collides with a common signal or a user-specific signal while transmitting the enhanced reference signal;
and when the transmission conflict is determined, executing a corresponding conflict processing mode.
14. The downlink transmission detection method according to any one of claims 1 to 13, further comprising:
and determining the frequency domain resource of the enhanced reference signal according to the main system information block.
15. The downlink transmission detection method according to any one of claims 1 to 13, further comprising:
and determining the frequency domain resource of the enhanced reference signal according to a preset acquisition rule, wherein the preset acquisition rule is a function of the cell identifier of the cell in which the terminal is positioned.
16. The downlink transmission detection method according to any one of claims 1 to 13,
the time-frequency position of the enhanced reference signal is fixed.
17. The downlink transmission detection method according to any one of claims 1 to 13,
and determining the time-frequency position of the enhanced reference signal according to the number of OFDM symbols occupied by one downlink transmission time interval.
18. The downlink transmission detection method according to any one of claims 1 to 13, wherein the step of issuing the enhanced reference signal specifically includes:
the enhanced reference signal is published within a full bandwidth.
19. The downlink transmission detecting method according to any one of claims 1 to 13, wherein the step of issuing the enhanced reference signal includes:
and issuing the enhanced reference signal in a partial bandwidth, wherein the partial bandwidth is the bandwidth of the full bandwidth except the middle predetermined number of physical resource blocks.
20. A base station, comprising:
the enhanced reference signal issuing unit issues an enhanced reference signal in a downlink transmission process so that a terminal can determine the channel occupation condition of a base station according to the enhanced reference signal;
a joint issuing unit, configured to issue a basic reference signal, so that the terminal jointly detects whether the base station occupies a channel for downlink transmission according to the basic reference signal and the enhanced 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;
further comprising:
the first determining unit is used for determining the signal sequence and the time-frequency position of the enhanced reference signal according to the cell common reference signal;
a fifth determining unit, configured to determine a time-frequency location of the enhanced reference signal according to a cell identifier of a cell in which the terminal is located;
the enhanced reference signal issuing unit is configured to:
issuing the enhanced reference signal through the same time-frequency positions of all antenna ports;
or,
the actual number of antenna ports issuing the enhanced reference signals is the same as the actual number of antenna ports issuing the cell common reference signals, an
The enhanced reference signal issuing unit is configured to:
issuing different ones of the enhanced reference signals at different locations through different antennas.
21. The base station of claim 20, wherein the enhanced reference signal issuing unit is specifically configured to:
and issuing the enhanced reference signal in a first downlink transmission time interval in the transmission opportunity so as to enable the terminal to determine the starting position of downlink transmission.
22. The base station of claim 20, wherein the enhanced reference signal issuing unit is specifically configured to:
the enhanced reference signal is issued in each downlink transmission time interval within a transmission opportunity.
23. The base station of claim 20, further comprising:
and the pre-judging unit is used for judging whether coverage enhancement can be finished in one downlink transmission time interval or not when the sounding signal is issued in the downlink transmission time interval, wherein the enhanced reference signal is not issued when the judging result is yes, and the step of issuing the enhanced reference signal is carried out when the judging result is no so as to issue the enhanced reference signal in a plurality of downlink transmission time intervals.
24. The base station of claim 20, further comprising:
and the sixth determining unit is used for determining the time-frequency position of the enhanced reference signal according to the demodulation reference signal.
25. The base station of claim 24, further comprising:
and in one 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.
26. The base station of claim 25, wherein the enhanced reference signal issuing unit is configured to:
and issuing the enhanced reference signal in the first time slot and/or the second time slot of a downlink transmission time interval.
27. The base station of claim 24,
the number of OFDM symbols occupied by the enhanced reference signal is a predetermined number.
28. The base station of claim 24, further comprising:
and a seventh determining unit, configured to determine, according to the length of the current downlink transmission time interval, the number of OFDM symbols occupied by the enhanced reference signal.
29. The base station of claim 24,
the frequency domain resource size of the enhanced reference signal is a predetermined size.
30. The base station of claim 24, further comprising:
an eighth determining unit, configured to determine, 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, a frequency domain resource of the enhanced reference signal, where a transmission density of the enhanced reference signal in one downlink transmission time interval is constant.
31. The base station of claim 20, further comprising:
and the ninth determining unit is used for determining the time-frequency position of the enhanced reference signal according to the channel state information reference signal.
32. The base station of claim 20, further comprising:
a collision determination unit that determines whether the enhanced reference signal collides with a common signal or a user-specific signal when transmitting the enhanced reference signal;
and the conflict processing unit executes a corresponding conflict processing mode when the transmission conflict is determined.
33. The base station according to any of claims 20 to 32, further comprising:
and the second determining unit is used for determining the frequency domain resource of the enhanced reference signal according to the main system information block.
34. The base station according to any of claims 20 to 32, further comprising:
and a third determining unit, configured to determine the frequency domain resource of the enhanced reference signal according to a predetermined acquisition rule, where the predetermined acquisition rule is a function of a cell identifier of a cell in which the terminal is located.
35. The base station according to any of the claims 20 to 32,
the time-frequency position of the enhanced reference signal is fixed.
36. The base station according to any of claims 20 to 32, further comprising:
and the fourth determining unit is used for determining the time-frequency position of the enhanced reference signal according to the number of the OFDM symbols occupied by one downlink transmission time interval.
37. The base station according to any of claims 20 to 32, wherein the enhanced reference signal issuing unit is configured to:
the enhanced reference signal is published within a full bandwidth.
38. The base station according to any of claims 20 to 32, wherein the enhanced reference signal issuing unit is configured to:
and issuing the enhanced reference signal in a partial bandwidth, wherein the partial bandwidth is the bandwidth of the full bandwidth except the middle predetermined number of physical resource blocks.
39. A downlink transmission detection method is characterized by comprising the following steps:
acquiring an enhanced reference signal issued by a base station;
detecting whether the base station occupies a channel for downlink transmission according to the enhanced reference signal;
acquiring a basic reference signal issued by the base station, wherein the basic reference signal comprises one or more of a cell common reference signal, a demodulation reference signal and a synchronization message signal;
the step of detecting whether the base station occupies a channel for downlink transmission according to the enhanced reference signal specifically includes:
jointly detecting whether the base station occupies a channel for downlink transmission according to the enhanced reference signal and the basic reference signal;
further comprising:
determining a signal sequence and a time-frequency position of the enhanced reference signal according to the cell common reference signal;
determining the time-frequency position of the enhanced reference signal according to the cell identification of the cell in which the terminal is positioned;
the step of issuing an enhanced reference signal includes:
issuing the enhanced reference signal through the same time-frequency positions of all antenna ports;
or,
the actual number of antenna ports issuing the enhanced reference signals is the same as the actual number of antenna ports issuing the cell common reference signals, an
The step of issuing an enhanced reference signal includes:
issuing different ones of the enhanced reference signals at different locations through different antennas.
40. The downlink transmission detecting method according to claim 39, further comprising:
and under the condition that the base station is detected to occupy the channel for downlink transmission, determining the downlink transmission time interval of the enhanced reference signal as the initial position of the downlink transmission.
41. A terminal, comprising:
the first acquisition unit is used for acquiring the enhanced reference signal issued by the base station;
a downlink transmission detection unit, which detects whether the base station occupies the channel for downlink transmission according to the enhanced reference signal;
a second obtaining unit, configured to obtain a basic reference signal issued 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;
the downlink transmission detection unit is specifically configured to:
jointly detecting whether the base station occupies a channel for downlink transmission according to the enhanced reference signal and the basic reference signal;
further comprising:
the first determining unit is used for determining the signal sequence and the time-frequency position of the enhanced reference signal according to the cell common reference signal;
a fifth determining unit, configured to determine a time-frequency location of the enhanced reference signal according to a cell identifier of a cell in which the terminal is located;
the first obtaining unit is used for:
issuing the enhanced reference signal through the same time-frequency positions of all antenna ports;
or,
the actual number of antenna ports issuing the enhanced reference signals is the same as the actual number of antenna ports issuing the cell common reference signals, an
The first obtaining unit is used for:
issuing different ones of the enhanced reference signals at different locations through different antennas.
42. The terminal of claim 41, further comprising:
and the initial position determining unit is used for determining the downlink transmission time interval of the enhanced reference signal as the initial position of downlink transmission under the condition that the base station is detected to occupy the channel for downlink transmission.
43. A terminal, comprising:
a processor; and
a memory for storing a plurality of data to be transmitted,
the memory has stored therein instructions executable by the processor, and the processor is configured to invoke the instructions stored by the memory to perform the following operations:
acquiring an enhanced reference signal issued by a base station;
detecting whether the base station occupies a channel for downlink transmission according to the enhanced reference signal;
issuing a basic reference signal for the terminal to jointly detect whether the base station occupies a channel for downlink transmission according to the basic reference signal and the enhanced reference signal,
wherein the base reference signal comprises one or more of a cell common reference signal, a demodulation reference signal, and a synchronization message signal;
further comprising:
determining a signal sequence and a time-frequency position of the enhanced reference signal according to the cell common reference signal;
determining the time-frequency position of the enhanced reference signal according to the cell identification of the cell in which the terminal is positioned;
the step of issuing an enhanced reference signal includes:
issuing the enhanced reference signal through the same time-frequency positions of all antenna ports;
or,
the actual number of antenna ports issuing the enhanced reference signals is the same as the actual number of antenna ports issuing the cell common reference signals, an
The step of issuing an enhanced reference signal includes:
issuing different ones of the enhanced reference signals at different locations through different antennas.
44. A base station, characterized in that,
comprises a transmitter, a receiver, a memory and a processor respectively connected with the transmitter, the receiver and the memory,
the memory has stored therein instructions executable by the processor, and the processor is configured to invoke the instructions stored by the memory to perform the following operations:
issuing an enhanced reference signal in a downlink transmission process so that a terminal can determine the channel occupation condition of a base station according to the enhanced reference signal;
acquiring a basic reference signal issued by the base station, wherein the basic reference signal comprises one or more of a cell common reference signal, a demodulation reference signal and a synchronization message signal;
the step of detecting whether the base station occupies a channel for downlink transmission according to the enhanced reference signal specifically includes:
jointly detecting whether the base station occupies a channel for downlink transmission according to the enhanced reference signal and the basic reference signal;
further comprising:
determining a signal sequence and a time-frequency position of the enhanced reference signal according to the cell common reference signal;
determining the time-frequency position of the enhanced reference signal according to the cell identification of the cell in which the terminal is positioned;
the step of issuing an enhanced reference signal includes:
issuing the enhanced reference signal through the same time-frequency positions of all antenna ports;
or,
the actual number of antenna ports issuing the enhanced reference signals is the same as the actual number of antenna ports issuing the cell common reference signals, an
The step of issuing an enhanced reference signal includes:
issuing different ones of the enhanced reference signals at different locations through different antennas.
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| CN201710194297.3A CN106789826B (en) | 2017-03-28 | 2017-03-28 | Downlink transmission detection method, base station and terminal |
| PCT/CN2018/080942 WO2018177332A1 (en) | 2017-03-28 | 2018-03-28 | Downlink transmission detection method, base station and terminal |
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| CN106789826B (en) * | 2017-03-28 | 2020-07-28 | 北京佰才邦技术有限公司 | Downlink transmission detection method, base station and terminal |
| CN109151893B (en) * | 2017-06-16 | 2022-02-18 | 展讯通信（上海）有限公司 | Resource mapping method and device of physical broadcast channel, base station and storage medium |
| WO2019061304A1 (en) * | 2017-09-29 | 2019-04-04 | 北京小米移动软件有限公司 | Reference signal transmission and reception method and device, base station and user equipment |
| US11039475B2 (en) | 2018-04-06 | 2021-06-15 | Mediatek Inc. | Detection of beginning of a transmission session in new radio unlicensed spectrum |
| CN113316968B (en) * | 2018-11-09 | 2023-11-07 | 株式会社Ntt都科摩 | Terminal, base station, system and wireless communication method |
| EP3993542B1 (en) * | 2019-06-25 | 2024-04-10 | Beijing Xiaomi Mobile Software Co., Ltd. | Transmission of configuration information for detecting multiple signals on an unlicensed frequency band |
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