CN114142980B - Reference signal transmission method and device - Google Patents

Abstract

The invention provides a method and a device for transmitting a reference signal, wherein the method comprises the following steps: the base station configures a channel state information reference signal (CSI-RS) resource parameter for the terminal and sends the channel state information reference signal resource parameter to the terminal; the base station sends the CSI-RS to the terminal according to the CSI-RS resource parameters, wherein the base station maps the CSI-RS on a time-frequency resource corresponding to the index number of the CSI-RS port according to the index number of the CSI-RS port and transmits the CSI-RS. By adopting the technical scheme, the problem of high probability of error selection of the precoding vector caused by the measurement error of the CSI-RS in the related technology is solved, the detection of the CSI-RS by the terminal according to the resource parameter issued by the base station is ensured, the transmission stability is improved, and the probability of error selection is greatly reduced.

Description

Reference signal transmission method and device

Technical Field

The present invention relates to the field of communications, and in particular, to a method and apparatus for transmitting a reference signal.

Background

In the related art, with the rapid development of life and production of wireless communication demands, the fourth generation long term evolution technology (Long Term Evolution, abbreviated as LTE), long term evolution-Advanced (LTE-a), and the fifth generation New radio access technology (NR, new RAT, new Radio Access Technology) schemes all use orthogonal frequency division multiplexing (OFDM, orthogonal Frequency Division Multiplexing) modulation-based technologies. In a communication system based on an OFDM technology, an OFDM symbol is a unit of a minimum transmission signal in a time domain, a plurality of OFDM symbols form a time Slot (Slot), and the Slot is used as a scheduling unit with the minimum time domain; the plurality of slots constitute one Frame (Frame) as a minimum time unit of upper layer signaling configuration. In LTE/LTE-a, one Subframe (Subframe) is formed by two slots, and one Subframe is used as the minimum scheduling unit. In OFDM modulation techniques, there are multiple subcarriers (subcarriers), one Subcarrier being the unit of the smallest transmission signal in the frequency domain. In Slot, a grid is formed by OFDM symbols in the time domain and subcarriers in the frequency domain, and an Element in the grid, that is, an intersection point of one OFDM symbol in the time domain and one Subcarrier in the frequency domain, is a Resource Element (RE), which is a minimum unit of transmission signals. In order to facilitate the use of frequency domain resources, the frequency domain sub-carrier is divided into a plurality of Resource Blocks (RBs), and one RB is formed by a plurality of continuous subcarriers, which may be an RB on one OFDM symbol, an RB on one Slot, or a single-finger frequency domain Resource. To facilitate defining the use of resources by some functions, REs are also typically divided into resource element groups (RE groups, resource Element Group), one RE Group consisting of multiple REs, e.g., an RE Group defined for control channel use resources. In LTE/LTE-A, the maximum bandwidth that single carrier can support is 20MHz, the maximum Subcarrier interval is 15kHz, the carrier frequency band is usually below 6GHz, the maximum bandwidth that NR single carrier can support exceeds 100MHz, the maximum Subcarrier interval reaches 480kHz, the carrier frequency band can be below 6GHz or above 6GHz, and the maximum throughput and spectral efficiency are both greatly improved compared with LTE/LTE-A.

In a wireless communication system, a Channel is generally estimated using a Reference Signal (RS), for example, a Channel state information Reference Signal (CSI-RS, channel-State Information Reference Signal) to obtain Channel state information as Reference information for a scheduling operation; channel coefficients are estimated, for example, using demodulation reference signals (DMRS, demodulation Reference Signal) to demodulate data. DMRS to 8 ports are supported in the LTE/LTE-a system, which are distributed over fixed OFDM symbols in subframes and fixed subcarriers, i.e. over fixed-location REs. The NR system has two DMRS at two positions, one is a Front demodulation reference signal (Front DMRS), which can use up to 2 OFDM symbols, the position and density on the frequency domain can be changed, and whether the second OFDM symbol is used or not can be changed; the other is an Additional demodulation reference signal (Additional DMRS), which can use up to 2 OFDM symbols, the position and density in the frequency domain can be changed, and whether to use the Additional DMRS and whether to use 1 OFDM symbol or 2 OFDM symbols can also be changed. In a wireless communication system based on OFDM technology, in transmitting CSI-RS, CSI-RS signals of multiple ports commonly share the same set of RE groups in a code division multiplexing (Code Division Multiplexing) manner, and such RE groups are called CDM RE groups. The downlink control information DCI (Downlink Control Information) is typically transmitted in the form of a downlink control information Format (DCI Format) to rapidly transmit signaling, for example, signaling of a physical layer.

The NR communication technology has 4 OFDM symbols in Slot for DMRS transmission, wherein the front DMRS can use two OFDM symbols, and the additional DMRS can use two OFDM symbols; and the density of DMRS in frequency may vary with Slot; and the CSI-RS is preconfigured through upper layer signaling. On the one hand, if the CSI-RS uses the OFDM symbol for transmitting the DMRS, there is a problem that the DMRS collides with the CSI-RS, that is, the DMRS and the CSI-RS are transmitted on the same resource and interfere with each other; on the other hand, there are a large number of channel measurement requirements in the NR communication technology, and correspondingly there are a large number of transmission requirements of CSI-RS, so there is a requirement of using more OFDM symbols, and if OFDM symbols used by the DMRS are not used, the requirement of transmitting CSI-RS will be affected; therefore, the technical problem to be solved is to use the OFDM symbol for transmitting the DMRS for transmitting the CSI-RS without collision with the DMRS.

The receiving end obtains the antenna port channel coefficient of the transmitting end through measuring the CSI-RS, and selects a codeword or a precoding matrix from a codebook according to the channel coefficient among the ports to feed back to the transmitting end as a reference for precoding adopted by the transmitting end. The precoding vector in the precoding matrix is a combination of the 2D-DFT beam vector and the polarization phase, i.e. the vector of the polarization dimension. The essence of the selection of the precoding matrix at the receiving end is to select the 2D-DFT beam vector and the polarization vector, and the essence is to select the beam vector and the polarization vector of two dimensions. Vector misconnection in any dimension leads to misconnection of the precoding vector and thus to misconnection of the precoding matrix. The channel coefficient measurement phase error between ports of any dimension is greater than half of the vector granularity of the corresponding dimension, so that vector error selection of the corresponding dimension is led; and the larger the ratio of the channel coefficient measurement phase error of the dimension to the vector granularity of the corresponding dimension is, the larger the probability of the corresponding dimension is. The multi-port CSI-RS is usually transmitted over multiple REs, and there is a difference between the channel coefficient phases between different REs, which may cause a channel coefficient measurement error between ports transmitted over different REs or RE groups. The channel coefficient difference between the frequency domains is usually caused by multipath time delay, and the channel coefficient difference between the time domains is usually caused by frequency offset and Doppler; at high frequencies, phase noise also causes channel coefficient differences between the time domains, and the higher the frequency, the more significant the phase noise effect. The technical problem to be solved is to reduce the probability of the misconvergence of the precoding vector caused by the CSI-RS measurement error.

The code division multiplexing of multiple ports of the CSI-RS on the frequency domain occupies multiple REs in one RB of the same OFDM symbol, or the CSI-RS of one port uses the multiple REs in one RB of the same OFDM symbol for transmission, so that the signal is enhanced and the interference is enhanced. The technical problem to be solved is to reduce the interference generated thereby.

In summary, the following technical problems in CSI-RS transmission need to be solved: OFDM symbols for transmitting the DMRS are used for transmitting the CSI-RS, and collision with the DMRS is avoided; reducing the error selection probability of a precoding vector caused by the CSI-RS measurement error; and the interference of the CSI-RS to the CSI-RS is weakened.

Namely, the related technical scheme has the following defects:

in the LTE technology, an OFDM symbol for transmitting the DMRS is used for transmitting the CSI-RS and the DMRS, wherein the CSI-RS and the DMRS are respectively transmitted by using different REs. In LTE, since the REs transmitting the DMRS are fixed, it is possible to transmit as such; however, in the NR technology, REs for transmitting the DMRS are changed, and a scheme of using different REs on the same OFDM symbol respectively cannot solve the problem that the CSI-RS and the DMRS use the same OFDM symbol in the NR.

In the related technical scheme, a transmission power scheme of the CSI-RS is added, and a scheme for reducing interference can only reduce measurement errors caused by interference; but cannot reduce the measurement error between the antenna port channel coefficients due to the variation of the channel itself; nor can the measurement error caused by phase noise be reduced; schemes that use phase tracking reference signals increase the overhead of the reference signals and the greater the density of the phase tracking reference signals the greater the overhead that can be generated.

A pseudo-random sequence scheme with the length larger than 2 is used in one RB of the same OFDM symbol in the CSI-RS sequence, so that the length of the CSI-RS on one OFDM symbol can be increased, and the storage overhead of both transmission parties can be increased.

Aiming at the problem of high probability of error selection of a precoding vector caused by a CSI-RS measurement error in the related art, no effective solution exists at present.

Disclosure of Invention

The embodiment of the invention provides a reference signal transmission method and device, a base station and a terminal, which at least solve the problem of high error selection probability of a precoding vector caused by a CSI-RS measurement error in the related art.

According to an embodiment of the present invention, there is provided a reference signal transmission method including: the first communication node configures a channel state information reference signal (CSI-RS) resource parameter for the second communication node, and sends the channel state information reference signal (CSI-RS) resource parameter to the second communication node; the first communication node sends the CSI-RS to the second communication node according to the CSI-RS resource parameters, wherein the first communication node maps the CSI-RS on a time-frequency resource corresponding to the index number of the CSI-RS port according to the index number of the CSI-RS port and transmits the CSI-RS.

Optionally, the first communication node determines the CSI-RS port index number according to a CDM RE Group index number of a code division multiplexing resource Group.

Optionally, the CSI-RS port index number increases as the index number of the CDM RE Group increases.

Optionally, the CSI-RS port index number is determined by the following formula: p=p '+il, where p is the index number of the CSI-RS port, p' is the index number of the port in the CDM Group of the code division multiplexing Group where the CSI-RS are located before transmission, L is the number of ports included in the CDM Group, and i is the index number of the CDM Group.

Optionally, the first communication node determines the CDM RE Group index number according to the frequency domain frequency of the CDM RE Group.

Optionally, the first communication node determines the CDM RE Group index number according to one of the following information: frequency domain of the CDM RE Group and time domain sequence of the CDM RE Group.

Optionally, the first communication node determines the CDM RE Group index number from the frequency domain frequency of the CDM RE Group within the same Group of OFDM symbols; and determining the CDM RE Group index number according to the time domain sequence of the CDM RE Group among different groups of OFDM symbols.

Optionally, the first communication node determines the index number of the CSI-RS port according to the resource Group RE Group position of the port corresponding to the CSI-RS.

Optionally, in the same OFDM symbol, the first communication node determines the CSI-RS port index number according to the frequency domain of the RE Group where the port is located; and among different OFDM symbols, the first communication node determines the index number of the CSI-RS port according to the RE Group time domain sequence where the port is located.

Optionally, one CDM RE Group includes one or more RE groups, and the first communication node determines a port index number mapped on the CDM RE Group according to a port index number of the RE Group.

Optionally, the CSI-RS time-multiplexes the same OFDM symbols with both demodulation reference signals DMRS transmitted by the first communication node.

Optionally, the first communication node sends downlink control information DCI in the form of a downlink control information Format DCI Format, where the CSI-RS and the DMRS are indicated by the downlink control information DCI to be sent in a time division multiplexing manner on the OFDM symbol.

Optionally, one field in the DCI Format is used to indicate the transmission situations of the CSI-RS and the DMRS on the OFDM symbol at the same time.

Optionally, one field in the DCI Format is used to indicate a transmission situation of the DMRS on the symbol, and the one field in the DCI Format and another field in the DCI Format jointly indicate a transmission situation of the CSI-RS on the OFDM symbol.

Optionally, the OFDM symbol includes at least one of: the second OFDM symbol of the front DMRS of the previous demodulation reference signal, the symbol of the additional DMRS of the additional demodulation reference signal.

Optionally, the first communication node indicates, through the category of the CSI-RS, a range of time domain OFDM symbols used by the first communication node in data transmission.

Optionally, the first communication node maps the CSI-RS on a time-frequency resource corresponding to the CSI-RS port index number according to the CSI-RS port index number, and further includes: the first communication node multiplies elements in a CSI-RS sequence of the CSI-RS by elements in a mask sequence; and transmitting the multiplied CSI-RS sequence on the time-frequency resource.

Alternatively, all resource blocks RB of the predetermined bandwidth range use the same mask sequence on the same OFDM symbol.

Optionally, the mask sequence is a subsequence of a preset length in the CSI-RS sequence on the same OFDM symbol.

Optionally, the first communication node determines the mask sequence according to the index number of the RB on the same OFDM symbol.

Optionally, the mask sequence is a subsequence of a preset length in the CSI-RS sequence on the same OFDM symbol, and the subsequence is determined by an index number of the RB.

Optionally, the first communication node configures a mask sequence for the second communication node.

According to another embodiment of the present invention, there is also provided a reference signal transmission method, including: the second communication node receives channel state information reference signal resource parameters sent by the first communication node; and the second communication node receives the CSI-RS sent by the first communication node according to the channel state information reference signal resource parameter, wherein the CSI-RS is received on a time-frequency resource corresponding to the index number of the CSI-RS port of the channel state information reference signal.

Optionally, the CSI-RS port index number is determined by the second communication node according to a CDM RE Group index number of a code division multiplexing resource Group.

Optionally, the CSI-RS port index number increases as the index number of the CDM RE Group increases.

Optionally, the CSI-RS port index number is determined by the following formula:

p=p '+il, where p is the index number of the CSI-RS port, p' is the index number of the port in the CDM Group of the code division multiplexing Group where the CSI-RS is located before transmission, L is the number of ports included in the CDM Group, and i is the index number of the CDM Group.

Optionally, the CDM RE Group index number is determined by the second communication node according to the frequency domain frequency of the CDM RE Group.

Optionally, the CDM RE Group index number is determined by the second communication node according to one of the following information: frequency domain of the CDM RE Group and time domain sequence of the CDM RE Group.

Optionally, determining, by the second communication node, the CDM RE Group index number from a frequency domain frequency of the CDM RE Group within the same Group of OFDM symbols; and determining the CDM RE Group index number between different groups of OFDM symbols by the second communication node according to the time domain sequence of the CDM RE Group.

Optionally, the index number of the CSI-RS port is determined by the second communication node according to the resource Group RE Group position where the port corresponding to the CSI-RS is located.

Optionally, in the same OFDM symbol, determining, by the second communication node, the CSI-RS port index number according to the frequency domain of the RE Group where the port is located; and determining the index number of the CSI-RS port by the first communication node according to the RE Group time domain sequence of the port among different OFDM symbols.

Optionally, one CDM RE Group includes one or more RE groups, and the port index number mapped on the CDM RE Group is determined by the second communication node according to the port index number of the RE Group.

Optionally, the CSI-RS time-multiplexes the same OFDM symbols with both demodulation reference signals DMRS transmitted by the first communication node.

Optionally, receiving downlink control information DCI sent by the first communication node through a downlink control information Format DCI Format, where the first communication node indicates, through the DCI, a time division multiplexing sending condition of the CSI-RS and the DMRS on the OFDM symbol.

Optionally, one field in the DCI Format is used to indicate the transmission situations of the CSI-RS and the DMRS on the OFDM symbol at the same time.

Optionally, one field in the DCI Format is used to indicate a transmission situation of the DMRS on the symbol, and the one field in the DCI Format and another field in the DCI Format jointly indicate a transmission situation of the CSI-RS on the OFDM symbol.

Optionally, the OFDM symbol includes at least one of: the second OFDM symbol of the front DMRS of the previous demodulation reference signal, the symbol of the additional DMRS of the additional demodulation reference signal.

Optionally, determining a range of time domain OFDM symbols used by the first communication node when transmitting data according to the category of CSI-RS transmitted by the first communication node.

Optionally, receiving the CSI-RS on a time-frequency resource corresponding to a CSI-RS port index number of the CSI-RS, further comprising: the first communication node multiplies elements in a CSI-RS sequence of the CSI-RS by elements in a mask sequence; and transmitting the multiplied CSI-RS sequence on the time-frequency resource.

Alternatively, all resource blocks RB of the predetermined bandwidth range use the same mask sequence on the same OFDM symbol.

Optionally, the mask sequence is a subsequence of a preset length in the CSI-RS sequence on the same OFDM symbol.

Optionally, the mask sequence is determined by the first communication node according to the index number of the RB on the same OFDM symbol.

Optionally, the mask sequence is a subsequence of a preset length in the CSI-RS sequence on the same OFDM symbol, and the subsequence is determined by an index number of the RB.

Optionally, the mask sequence is configured by the first communication node for a second communication node.

According to another embodiment of the present invention, there is also provided a transmission apparatus of a reference signal, applied to a first communication node, including: the configuration module is used for configuring channel state information reference signal (CSI-RS) resource parameters for the second communication node and sending the channel state information reference signal resource parameters to the second communication node; and the sending module is used for sending the CSI-RS to the second communication node according to the CSI-RS resource parameter, wherein the sending module maps the CSI-RS on a time-frequency resource corresponding to the index number of the CSI-RS port according to the index number of the CSI-RS port and transmits the CSI-RS.

According to another embodiment of the present invention, there is provided a transmission apparatus of a reference signal, applied to a second communication node, including: the first receiving module is used for receiving channel state information reference signal resource parameters sent by the first communication node; and the second receiving module is used for receiving the CSI-RS sent by the first communication node according to the channel state information reference signal resource parameter, wherein the CSI-RS is received on a time-frequency resource corresponding to the index number of the CSI-RS port of the channel state information reference signal.

According to another embodiment of the present invention, there is also provided a first communication node including: the first processor is used for configuring channel state information reference signal (CSI-RS) resource parameters for the second communication node, and mapping the CSI-RS on a time-frequency resource corresponding to the index number of the CSI-RS port according to the index number of the CSI-RS port; and the first communication device is used for sending the channel state information reference signal resource parameter to a second communication node and sending the CSI-RS to the second communication node on the time-frequency resource according to the CSI-RS resource parameter.

According to another embodiment of the present invention, there is also provided a second communication node including: a second communication device, configured to receive a channel state information reference signal resource parameter sent by the first communication node; and the second processor is used for receiving the CSI-RS sent by the first communication node according to the channel state information reference signal resource parameter, wherein the processor receives the CSI-RS on a time-frequency resource corresponding to the index number of the CSI-RS port of the channel state information reference signal through the second communication device.

According to another embodiment of the present invention, there is also provided a storage medium including a stored program, wherein the program, when run, performs the method described in any one of the above alternative embodiments.

According to another embodiment of the present invention, there is also provided a processor, characterized in that the processor is configured to run a program, wherein the program, when run, performs the method as described in any of the above alternative embodiments.

According to the invention, a base station configures a channel state information reference signal (CSI-RS) resource parameter for a terminal and sends the channel state information reference signal resource parameter to the terminal; the base station sends the CSI-RS to the terminal according to the CSI-RS resource parameters, wherein the base station maps the CSI-RS on a time-frequency resource corresponding to the index number of the CSI-RS port according to the index number of the CSI-RS port and transmits the CSI-RS. By adopting the technical scheme, the problem of high probability of error selection of the precoding vector caused by the measurement error of the CSI-RS in the related technology is solved, the detection of the CSI-RS by the terminal according to the resource parameter issued by the base station is ensured, the transmission stability is improved, and the probability of error selection is greatly reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:

fig. 1 is a flowchart of a reference signal transmission method according to an embodiment of the present invention.

Detailed Description

Embodiments of the present application provide a mobile communication network (including, but not limited to, a 5G mobile communication network), where a network architecture of the network may include a network-side device (e.g., a base station) and a terminal. In this embodiment, an information transmission method capable of operating on the network architecture is provided, and it should be noted that the operating environment of the information transmission method provided in the embodiment of the present application is not limited to the network architecture.

It should be noted that, in this application, the first communication node may be a base station side device, and the second communication node may be a terminal side device, and of course, the first communication node may also be a terminal side device, that is, the two communication nodes are device-to-device communication.

Example 1

In this embodiment, a method for transmitting a reference signal operating in the base station is provided, and fig. 1 is a flowchart of a method for transmitting a reference signal according to an embodiment of the present invention, as shown in fig. 1, where the flowchart includes the following steps:

Step S102, a base station configures a channel state information reference signal (CSI-RS) resource parameter for a terminal and sends the CSI-RI resource parameter to the terminal;

step S104, the base station sends the CSI-RS to the terminal according to the CSI-RS resource parameters, wherein the base station maps the CSI-RS on a time-frequency resource corresponding to the index number of the CSI-RS port according to the index number of the CSI-RS port and transmits the CSI-RS.

Through the steps, a base station configures a channel state information reference signal (CSI-RS) resource parameter for a terminal and sends the CSI-RI resource parameter to the terminal; the base station sends the CSI-RS to the terminal according to the CSI-RS resource parameters, wherein the base station maps the CSI-RS on a time-frequency resource corresponding to the index number of the CSI-RS port according to the index number of the CSI-RS port and transmits the CSI-RS. By adopting the technical scheme, the problem of high probability of error selection of the precoding vector caused by the measurement error of the CSI-RS in the related technology is solved, the detection of the CSI-RS by the terminal according to the resource parameter issued by the base station is ensured, the transmission stability is improved, and the probability of error selection is greatly reduced.

Alternatively, the execution subject of the above steps may be a base station or the like, but is not limited thereto.

Optionally, the base station determines the CSI-RS port index number according to a CDM RE Group index number of the code division multiplexing resource Group.

Optionally, the CSI-RS port index number increases as the index number of the CDM RE Group increases.

Optionally, the CSI-RS port index number is determined by the following formula: p=p '+il, where p is the index number of the CSI-RS port, p' is the index number of the port in the CDM Group of the code division multiplexing Group where the CSI-RS is located before transmission, L is the number of ports included in the CDM Group, and i is the index number of the CDM Group.

Optionally, the base station determines the CDM RE Group index number according to the frequency domain frequency of the CDM RE Group.

Optionally, the base station determines the CDM RE Group index number according to one of the following information: frequency domain of the CDM RE Group, time domain sequencing of the CDM RE Group.

Optionally, the base station determines the CDM RE Group index number according to the frequency domain frequency of the CDM RE Group within the same Group of OFDM symbols; the CDM RE Group index number is determined according to the time domain sequencing of the CDM RE Group among different sets of OFDM symbols.

Optionally, the base station determines the index number of the CSI-RS port according to the resource Group RE Group position of the port corresponding to the CSI-RS.

Optionally, in the same OFDM symbol, the base station determines the index number of the CSI-RS port according to the frequency domain of the RE Group where the port is located; between different OFDM symbols, the base station determines the index number of the CSI-RS port according to the RE Group time domain sequence where the port is located.

Optionally, one CDM RE Group includes one or more RE groups, and the base station determines a port index number mapped on the CDM RE Group according to the port index number of the RE Group.

Alternatively, the CSI-RS time-multiplexes the same OFDM symbols with both demodulation reference signals DMRS transmitted by the base station.

Optionally, the base station sends downlink control information DCI in a downlink control information Format DCI Format, where the downlink control information DCI indicates a time division multiplexing transmission situation of the CSI-RS and the DMRS on the OFDM symbol.

Optionally, one field in the DCI Format is used to indicate the transmission situations of the CSI-RS and the DMRS on the OFDM symbol at the same time.

Optionally, one field in the DCI Format is used to indicate the transmission situation of the DMRS on the symbol, and the one field in the DCI Format and another field in the DCI Format jointly indicate the transmission situation of the CSI-RS on the OFDM symbol.

Optionally, the OFDM symbol includes at least one of: the second OFDM symbol of the front DMRS of the previous demodulation reference signal, the symbol of the additional DMRS of the additional demodulation reference signal.

Optionally, the base station indicates a range of time domain OFDM symbols used by the base station for data transmission through the category of the CSI-RS.

Optionally, the base station maps the CSI-RS on a time-frequency resource corresponding to the CSI-RS port index number according to the CSI-RS port index number for transmission, and further includes: the base station multiplies the elements in the CSI-RS sequence of the CSI-RS by the elements in the mask sequence; and transmitting the multiplied CSI-RS sequence on the time-frequency resource.

Alternatively, all resource blocks RB of the predetermined bandwidth range use the same mask sequence on the same OFDM symbol.

Optionally, the mask sequence is a subsequence of a preset length in the CSI-RS sequence on the same OFDM symbol.

Alternatively, the base station determines the mask sequence according to the index number of the RB on the same OFDM symbol.

Optionally, the mask sequence is a subsequence of a preset length in the CSI-RS sequence on the same OFDM symbol, where the subsequence is determined by an index number of the RB.

Optionally, the base station configures a mask sequence for the terminal.

According to another embodiment of the present invention, there is also provided a reference signal transmission method including the steps of:

step one, a terminal receives CSI-RI resource parameters sent by a base station;

and step two, the terminal receives the CSI-RS sent by the base station according to the CSI-RI resource parameter, wherein the CSI-RS is received on a time-frequency resource corresponding to the index number of the CSI-RS port of the CSI-RI.

Optionally, the CSI-RS port index number is determined by the terminal according to a CDM RE Group index number of the code division multiplexing resource Group.

Optionally, the CSI-RS port index number increases as the index number of the CDM RE Group increases.

Optionally, the CSI-RS port index number is determined by the following formula: p=p '+il, where p is the index number of the CSI-RS port, p' is the index number of the port in the CDM Group of the code division multiplexing Group where the CSI-RS is located before transmission, L is the number of ports included in the CDM Group, and i is the index number of the CDM Group.

Optionally, the CDM RE Group index number is determined by the terminal according to a frequency domain of the CDM RE Group.

Optionally, the CDM RE Group index number is determined by the terminal according to one of the following information: frequency domain of the CDM RE Group, time domain sequencing of the CDM RE Group.

Optionally, determining, by the terminal, the CDM RE Group index number from the frequency domain frequency of the CDM RE Group within the same set of OFDM symbols; and determining the CDM RE Group index number between different groups of OFDM symbols by the terminal according to the time domain sequence of the CDM RE Group.

Optionally, the index number of the CSI-RS port is determined by the terminal according to the resource Group RE Group position where the port corresponding to the CSI-RS is located.

Optionally, in the same OFDM symbol, determining, by the terminal, the CSI-RS port index number according to the frequency of the RE Group frequency domain in which the port is located; and determining the index number of the CSI-RS port by the base station according to the RE Group time domain sequence of the port among different OFDM symbols.

Optionally, one CDM RE Group includes one or more RE groups, and the port index number mapped on the CDM RE Group is determined by the terminal according to the port index number of the RE Group.

Alternatively, the CSI-RS time-multiplexes the same OFDM symbols with both demodulation reference signals DMRS transmitted by the base station.

Optionally, receiving downlink control information DCI sent by the base station through a downlink control information Format DCI Format, where the base station indicates, through the DCI, a time division multiplexing sending condition of the CSI-RS and the DMRS on the OFDM symbol.

Optionally, one field in the DCI Format is used to indicate the transmission situations of the CSI-RS and the DMRS on the OFDM symbol at the same time.

Optionally, one field in the DCI Format is used to indicate the transmission situation of the DMRS on the symbol, and the one field in the DCI Format and another field in the DCI Format jointly indicate the transmission situation of the CSI-RS on the OFDM symbol.

Optionally, the OFDM symbol includes at least one of: the second OFDM symbol of the front DMRS of the previous demodulation reference signal, the symbol of the additional DMRS of the additional demodulation reference signal.

Optionally, determining the range of the time domain OFDM symbol used by the base station when transmitting data according to the category of the CSI-RS transmitted by the base station.

Optionally, receiving the CSI-RS on a time-frequency resource corresponding to a CSI-RS port index number of the CSI-RS, further comprising: the base station multiplies the elements in the CSI-RS sequence of the CSI-RS by the elements in the mask sequence; and transmitting the multiplied CSI-RS sequence on the time-frequency resource.

Alternatively, all resource blocks RB of the predetermined bandwidth range use the same mask sequence on the same OFDM symbol.

Optionally, the mask sequence is a subsequence of a preset length in the CSI-RS sequence on the same OFDM symbol.

Alternatively, the mask sequence is determined by the base station according to the index number of the RB on the same OFDM symbol.

Optionally, the mask sequence is a subsequence of a preset length in the CSI-RS sequence on the same OFDM symbol, where the subsequence is determined by an index number of the RB.

Optionally, the mask sequence is configured for the base station for the terminal.

The following detailed description is of preferred embodiments of the invention.

In a preferred embodiment of the present invention, there is provided a method for transmitting a reference signal, including: the method comprises the steps of configuring a CSI-RS resource parameter, transmitting the configured CSI-RS resource parameter, and transmitting the CSI-RS according to the CSI-RS resource parameter, wherein the CSI-RS is transmitted on a time-frequency resource according to port index number mapping;

for example, a base station configures a CSI-RS resource parameter, transmits the configured CSI-RS resource parameter, and transmits the CSI-RS according to the CSI-RS resource parameter, wherein the CSI-RS is transmitted on a time-frequency resource according to port index number mapping;

for example, a base station configures a CSI-RS resource parameter, transmits the configured CSI-RS resource parameter, and a terminal transmits the CSI-RS according to the CSI-RS resource parameter, wherein the CSI-RS is transmitted on a time-frequency resource according to port index mapping;

for example, the CSI-RS resource parameters include: port number of CSI-RS

For example, the CSI-RS resource parameters include: the port code division multiplexing length of the CSI-RS, namely the length of an orthogonal sequence used by the code division multiplexing among ports;

for example, the CSI-RS resource parameters include: class of port code division multiplexing for CSI-RS

For example, the CSI-RS resource parameters include: the number of OFDM symbols used by CSI-RS

For example, the CSI-RS resource parameters include: position or index number of OFDM symbol used for CSI-RS

For example, the CSI-RS resource parameters include: index number of OFDM symbol used for CSI-RS

For example, the CSI-RS resource parameters include: category of component of aggregated CSI-RS RE pattern

For example, the CSI-RS resource parameters include: location of component of aggregated CSI-RS RE pattern

For example, the CSI-RS resource parameters include: index number of component of polymerized CSI-RS RE pattern

For example, the CSI-RS resource parameters include: power parameter

Alternative embodiment 1, wherein the port index number of the CSI-RS is determined by a CDM RE Group index number;

for example: and the CSI-RS is transmitted on the time-frequency resource according to the port index number mapping, and the port index number of the CSI-RS is reduced according to the increase of the index number of the CDM RE Group.

Alternative embodiment 1-1. The CSI-RS is transmitted on the time-frequency resource according to the port index number mapping, and the port index number of the CSI-RS is increased by increasing the index number of the CDM RE Group;

for example: p= (P' -P)₀ )·K+i+P₀ P is the transmitted port index number, p' is the port index number in the CDM Group before transmission, and i is the index number of the CDM Group; k is CDM Group number; is the port start number of the CSI-RS;

for example: when P' < P₀ At +l/2, p=p' +il/2; when P' > P₀ At +L/2, p=p' +iL/2+N/2; p is the transmitted port index number, p' is the port index number in the CDM Group before transmission, and i is the index number of the CDM Group; n is the number of ports; l is the number of ports included in CDM Group, which is also the length of CDM; is the port start number of the CSI-RS.

Alternative embodiments 1-1-1:p = p '+il, p being the transmitted port index number, p' being the port index number in the CDM Group before transmission, L being the number of ports included in the CDM Group and also the length of the CDM; i is the index number of CDM Group.

Alternative examples 1-2: the CSI-RS is transmitted on time-frequency resources according to port index number mapping, the port index number of the CSI-RS is determined by CDM RE Group index numbers, and the CDM RE Group index numbers are determined according to frequency domain frequency

For example: the CDM Group index number with high frequency is small, and the CDM Group index number with low frequency is large;

for example: the CDM Group index number with high frequency is high, and the CDM Group index number with low frequency is small.

Alternative examples 1-2-1: CDM RE Group index numbers are determined according to frequency of a frequency domain and time domain sequence;

for example: the CDM Group index number with high frequency is small, the CDM Group index number with low frequency is large, the CDM Group index number earlier in the time domain is small, and the CDM Group index number later in the time domain is large;

For example: CDM Group index numbers with high frequency are high, CDM Group index numbers with low frequency are small; the CDM Group index number early in the time domain is small, and the CDM Group index number after in the time domain is large.

Alternative examples 1-2-1-1: CDM RE Group index numbers are determined in the same OFDM symbol Group according to the frequency of the frequency domain, and different groups are determined successively according to the time domain;

for example: in the same OFDM symbol Group, CDM Group index numbers with high frequency are small, CDM Group index numbers with low frequency are large; in different OFDM symbols, the CDM Group index number early in the time domain is small, and the CDM Group index number after in the time domain is large;

for example: in the same OFDM symbol Group, CDM Group index numbers with high frequency are high, CDM Group index numbers with low frequency are small; in different OFDM symbols, the CDM Group index number early in the time domain is small, and the CDM Group index number after in the time domain is large.

Alternative embodiment 2: the index number of the CSI-RS port is determined by the RE Group position where the corresponding port is located

For example: the index number of the CSI-RS port is determined by the frequency domain of the RE Group;

for example: the index number of the CSI-RS port is determined by the time domain sequence of the RE Group.

In the same OFDM symbol, the index number of the CSI-RS port is determined by the frequency domain of the RE Group; between different OFDM symbols, the index number of the CSI-RS port is determined by the time domain of the RE Group where the index number is located.

For example: in the same OFDM symbol, the port index number corresponding to the RE Group with high frequency is small, and the port index number corresponding to the RE Group with low frequency is large; among different OFDM symbols, the port index number corresponding to the RE Group earlier in the time domain is small, and the port index number corresponding to the RE Group later in the time domain is large;

for example: in the same OFDM symbol, the port index number corresponding to the RE Group with high frequency is high, and the port index number corresponding to the RE Group with low frequency is small; among different OFDM symbols, the port index number corresponding to the RE Group earlier in the time domain is small, and the port index number corresponding to the RE Group later in the time domain is large.

Alternative embodiment 2-2: the CDM RE groups include RE groups, and the port index numbers mapped on the CDM RE groups are determined by the port index numbers of the RE groups.

For example: the CDM RE groups include 2 RE groups, the port index number of the first RE Group being { p }_0,0 ,p_0,1 Port index number of second RE Group { p }_1,0 ,p_1,1 Determining the port index number of CDM RE Group as { p } from the port index numbers of the two RE groups_0,0 ,p_0,1 ,p_1,0 ,p_1,1 }

For example: the CDM RE groups include 2 RE groups, the index number of the first RE Group being k₀ The corresponding port index number is { p }₀ ,p₁ Second RE Group index number k₁ The corresponding port index number is { p }₀ ,p₁ Determining the port index number of CDM RE Group as { 2.k } from the port index numbers of the two RE groups₀ +p_0,0 ,2·k₀ +p_0,1 ,2·k₁ p_1,0 ,2·k₁ p_1,1 }。

Alternative embodiment 3: OFDM symbol with same CSI-RS and DMRS time division multiplexing

For example, the CSI-RS and the DMRS use OFDM symbols at the same position on different slots, or OFDM symbols with the same index number, respectively; the Slot is a time domain transmission unit formed by a plurality of OFDM symbols;

or the CSI-RS and the DMRS respectively use OFDM symbols at the same position or OFDM symbols with the same index number on different frames; the Frame is a time domain transmission unit formed by a plurality of slots.

Alternative example 3-1: and indicating the time division multiplexing transmission condition of the CSI-RS and the DMRS on the OFDM symbol by the DCI.

For example: one domain in the DCI Format indicates the transmission condition of the DMRS on the symbol, and the other domain in the DCI Format indicates the transmission condition of the CSI-RS on the OFDM symbol.

Alternative examples 3-1-1: one domain in DCI Format indicates the sending condition of the CSI-RS and the DMRS on the OFDM symbol at the same time;

for example, the state of bit string composed of all bits in one domain, or the state indication of the composed value is used for simultaneously indicating the transmission condition of CSI-RS and DMRS on the OFDM symbol

For example: state indication using bit string composed of partial bits in one domain or composed numerical value simultaneously indicating transmission condition of CSI-RS and DMRS on OFDM symbol

For example: the state of bit strings formed by partial bits in one domain or the state of formed numerical values are adopted to indicate the transmission condition of the DMRS on the OFDM symbols at the same time; the state of bit strings formed by another part of bits in one domain or the state of formed values is adopted to indicate the transmission condition of the CSI-RS on the OFDM symbol.

Alternative examples 3-1-2: one domain in DCI Format indicates the transmission condition of the DMRS on the symbol, and the domain and the other domain in DCIFFormat jointly indicate the transmission condition of the CSI-RS on the OFDM symbol.

For example: one domain of DCI Format indicates the DMRS to be sent on the symbol, the other domain of DCI Format indicates the CSI-RS to be sent on the same symbol at the same time, and finally, the two domains jointly determine that the indication CSI-RS is not sent;

for example: one domain of DCI Format indicates the DMRS to be sent on the symbol, the other domain of DCI Format indicates the CSI-RS not to be sent on the same symbol, and finally, the two domains jointly determine that the DCI-RS is indicated not to be sent;

For example: one domain of DCI Format indicates that the DMRS is not transmitted in the symbol, the other domain of DCI Format indicates that the CSI-RS is transmitted in the same symbol, and finally the two domains jointly determine that the DCI-RS is transmitted in the symbol;

for example: one domain of DCI Format indicates that the DMRS is not transmitted on the symbol, the other domain of DCI Format indicates that the CSI-RS is not transmitted on the same symbol, and finally, the two domains jointly determine that the DCI-RS is indicated not to be transmitted on the symbol.

Alternative embodiment 3-2: the OFDM symbol includes at least one of: the second OFDM symbol for front DMRS, the symbol for the additional DMRS.

For example: a first OFDM symbol of the additional DMRS;

for example: a second OFDM symbol of the additional DMRS;

for example: the first OFDM symbol of the additional DMRS and the second OFDM symbol of the additional DMRS.

Alternative examples 3-3: the category of the CSI-RS is an aperiodic category.

For example: triggering by a physical layer signaling, and transmitting the CSI-RS once;

for example: triggered by Mac-CE signaling, CSI-RS is transmitted once.

Alternative embodiment 4: the category of the CSI-RS indicates the range of time domain OFDM symbols it transmits, e.g., the category of the CSI-RS indicates the range of time domain OFDM symbols that the CSI-RS sends;

For example, the category of CSI-RS indicates the time domain OFDM symbol range that CSI-RS receives;

for example, the category of periodic or semi-persistent CSI-RS indicates that the transmission time domain OFDM symbol range of CSI-RS is other symbols than the following OFDM symbols: a front DMRS first OFDM symbol, a front DMRS second OFDM symbol, and an additional DMRS OFDM symbol;

for example, the category of aperiodic CSI-RS indicates that the transmission time domain OFDM symbol range of CSI-RS is other symbols than the following OFDM symbol: first OFDM symbol of front DMRS.

Alternative embodiment 5 csi-RS maps to REs, further comprising the operations of: elements in the CSI-RS sequence are multiplied by elements in the mask sequence;

the mask sequence is a sequence with the length of L, L is the number of subcarriers of the RB on the frequency domain, and elements in the mask correspond to REs on the frequency domain in the RB one by one; the elements in the CSI-RS sequence multiplied by the elements in the mask sequence refer to elements in the mask sequence corresponding to each element in the CSI-RS sequence multiplied by the sending RE.

Alternative embodiment 5-1. On the same symbol, all RBs of a predetermined bandwidth range use the same mask sequence;

for example, the predetermined bandwidth is a portion of the system bandwidth;

for example, the predetermined bandwidth is a system bandwidth;

For example, the predetermined bandwidth is a bandwidth of one carrier;

for example, the predetermined bandwidth is a portion of one carrier bandwidth;

for example, the predetermined bandwidth is a configured bandwidth.

Alternative embodiment 5-1-2. The masking sequence is a sub-sequence of length L in the CSI-RS sequence on the same symbol;

for example: a subsequence of consecutive elements of length L starting with the r-th element in the CSI-RS sequence;

for example: a subsequence of length L starting with a first element in the CSI-RS sequence;

for example: a subsequence of length L formed by elements of equal interval M starting with the r-th element in the CSI-RS sequence;

for example: the starting element varies with the sequence number of the symbol.

Alternative embodiment 5-2 the mask sequence is determined by the index number of RB on the same symbol.

Alternative example 5-2-1: the mask sequence is a sub-sequence with a length L in the CSI-RS sequence on the same symbol, and the sub-sequence is determined by the index number of the RB;

for example: the subsequence is formed by continuous elements with the length L in the CSI-RS sequence, the initial position is r, and the r is changed by the index number of the RB;

for example: a subsequence of length L formed by elements with equal intervals of M in the CSI-RS sequence; m is determined by the index number of RB;

For example: a subsequence of length L formed by elements of equal interval M starting with the r-th element in the CSI-RS sequence; r is determined by the index number of RB;

alternative embodiments 5-3 the masking sequence is configured for the terminal; for example: the mask sequence configures the terminal by upper layer signaling.

From the description of the above embodiments, it will be clear to a person skilled in the art that the method according to the above embodiments may be implemented by means of software plus the necessary general hardware platform, but of course also by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method according to the embodiments of the present invention.

Example two

The embodiment also provides a reference signal transmission device, which is used for implementing the foregoing embodiments and preferred embodiments, and is not described in detail. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

According to another embodiment of the present invention, there is provided a transmission apparatus of a reference signal, applied to a base station, including:

the configuration module is used for configuring channel state information reference signal (CSI-RS) resource parameters for the terminal and sending the channel state information reference signal resource parameters to the terminal;

and the sending module is connected to the configuration module and is used for sending the CSI-RS to the terminal according to the CSI-RS resource parameter, wherein the sending module maps the CSI-RS on a time-frequency resource corresponding to the index number of the CSI-RS port according to the index number of the CSI-RS port and transmits the CSI-RS.

According to another embodiment of the present invention, there is provided a transmission apparatus of a reference signal, applied to a terminal, including:

the first receiving module is used for receiving channel state information reference signal resource parameters sent by the base station;

and the second receiving module is used for receiving the CSI-RS transmitted by the base station according to the channel state information reference signal resource parameter, wherein the CSI-RS is received on a time-frequency resource corresponding to the index number of the CSI-RS port of the channel state information reference signal.

It should be noted that each of the above modules may be implemented by software or hardware, and for the latter, it may be implemented by, but not limited to: the modules are all located in the same processor; alternatively, the above modules may be located in different processors in any combination.

Example III

According to another embodiment of the present invention, there is also provided a base station including:

the first processor is used for configuring channel state information reference signal (CSI-RS) resource parameters for the terminal, and mapping the CSI-RS on a time-frequency resource corresponding to the index number of the CSI-RS port according to the index number of the CSI-RS port;

and the first communication device is used for sending the channel state information reference signal resource parameter to a terminal and sending the CSI-RS to the terminal on the time-frequency resource according to the CSI-RS resource parameter.

According to another embodiment of the present invention, there is also provided a terminal including:

a second communication device, configured to receive a channel state information reference signal resource parameter sent by a base station;

and the second processor is used for receiving the CSI-RS sent by the base station according to the channel state information reference signal resource parameter, wherein the processor receives the CSI-RS on a time-frequency resource corresponding to the index number of the CSI-RS port of the channel state information reference signal through the second communication device.

Example IV

According to another embodiment of the present invention, a processor is provided for running a program, wherein the program when run performs the method as described in any of the above alternative embodiments.

Example five

According to another embodiment of the present invention, there is also provided a storage medium including a stored program, wherein the program, when run, performs the method described in any one of the above alternative embodiments.

It will be appreciated by those skilled in the art that the modules or steps of the invention described above may be implemented in a general purpose computing device, they may be concentrated on a single computing device, or distributed across a network of computing devices, they may alternatively be implemented in program code executable by computing devices, so that they may be stored in a memory device for execution by computing devices, and in some cases, the steps shown or described may be performed in a different order than that shown or described, or they may be separately fabricated into individual integrated circuit modules, or multiple modules or steps within them may be fabricated into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (27)

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

the first communication node configures channel state information reference signal resource parameters for the second communication node and sends the channel state information reference signal resource parameters to the second communication node;

the first communication node sends the channel state information reference signal to the second communication node according to the channel state information reference signal resource parameter, wherein the first communication node maps the channel state information reference signal on a time-frequency resource corresponding to the channel state information reference signal port index number according to the channel state information reference signal port index number and transmits the channel state information reference signal; wherein the channel state information reference signal resource parameters include: index number of OFDM symbol used for channel state information reference signal.

2. The method of claim 1 wherein the first communication node determines the channel state information reference signal port index number from a code division multiplexed resource group index number.

3. The method according to claim 2, characterized by comprising:

the channel state information reference signal port index number increases as the index number of the code division multiplexing resource group increases.

4. The method of claim 1 wherein said channel state information reference signal port index number is determined by the formula:

p=p '+il, where p is the port index number of the channel state information reference signal, p' is the port index number in the code division multiplexing group where the channel state information reference signal is located, L is the size of the code division multiplexing group, and i is the index number of the code division multiplexing group.

5. The method of claim 2 wherein the first communication node determines the code division multiplexed resource set index number based on a frequency domain frequency of the code division multiplexed resource set.

6. The method of claim 5, wherein the first communication node determines the code division multiplexing resource group index number based on one of: the frequency domain frequency of the code division multiplexing resource group and the time domain sequence of the code division multiplexing resource group.

7. The method of claim 6, wherein the first communication node determines the code division multiplexing resource group index number from a frequency domain frequency of the code division multiplexing resource group within the same orthogonal frequency division multiplexing symbol; and determining the index number of the code division multiplexing resource group according to the time domain sequence of the code division multiplexing resource group among different orthogonal frequency division multiplexing symbols.

8. The method of claim 1, wherein the first communication node determines the port index number of the channel state information reference signal according to a resource group location of a port corresponding to the channel state information reference signal.

9. The method of claim 8 wherein said first communication node determines said channel state information reference signal port index number based on the frequency domain frequency of the resource group in which said port is located within the same orthogonal frequency division multiplexing symbol; and between different orthogonal frequency division multiplexing symbols, the first communication node determines the index number of the channel state information reference signal port according to the time domain sequence of the resource group where the port is positioned.

10. The method of claim 1 wherein the channel state information reference signal is time division multiplexed with orthogonal frequency division multiplexed symbols of the same index number as the demodulation reference signal transmitted by the first communication node.

11. A method for transmitting a reference signal, comprising:

the second communication node receives channel state information reference signal resource parameters sent by the first communication node;

the second communication node receives the channel state information reference signal sent by the first communication node according to the channel state information reference signal resource parameter, wherein the channel state information reference signal is received on a time-frequency resource corresponding to a channel state information reference signal port index number of the channel state information reference signal; wherein the channel state information reference signal resource parameters include: index number of OFDM symbol used for channel state information reference signal.

12. The method of claim 11 wherein the channel state information reference signal port index number is determined by the second communication node from a code division multiplexed resource group index number.

13. The method of claim 12 wherein the channel state information reference signal port index number increases as the index number of the set of code division multiplexing resources increases.

14. The method of claim 13 wherein said channel state information reference signal port index number is determined by the formula:

p=p '+il, where p is the port index number of the channel state information reference signal, p' is the port index number in the code division multiplexing group where the channel state information reference signal is located, L is the number of ports included in the code division multiplexing group, and i is the index number of the code division multiplexing group.

15. The method of claim 12 wherein the code division multiplexed resource set index number is determined by the second communication node based on a frequency domain frequency of the code division multiplexed resource set.

16. The method of claim 15, wherein the code division multiplexing resource group index number is determined by the second communication node based on one of: the frequency domain frequency of the code division multiplexing resource group and the time domain sequence of the code division multiplexing resource group.

17. The method of claim 16, wherein the code division multiplexing resource group index number is determined by the second communication node from the frequency domain frequency of the code division multiplexing resource group within the same orthogonal frequency division multiplexing symbol; and determining the index number of the code division multiplexing resource group by the second communication node according to the time domain sequence of the code division multiplexing resource group among different orthogonal frequency division multiplexing symbols.

18. The method of claim 11, wherein the channel state information reference signal port index number is determined by the second communication node according to a resource group location of a port corresponding to the channel state information reference signal.

19. The method of claim 18 wherein the channel state information reference signal port index number is determined by the second communication node from the frequency domain frequency of the resource group in which the port is located within the same orthogonal frequency division multiplexing symbol; and determining the index number of the channel state information reference signal port by the second communication node according to the time domain sequence of the resource group where the port is positioned among different orthogonal frequency division multiplexing symbols.

20. The method of claim 11 wherein the channel state information reference signal is time division multiplexed with orthogonal frequency division multiplexed symbols of the same index number as the demodulation reference signal transmitted by the first communication node.

21. The method of claim 20, wherein receiving downlink control information, DCI, sent by the first communication node in a downlink control information format, wherein the first communication node indicates, via the DCI, a time division multiplexed transmission of the channel state information reference signal and the demodulation reference signal on the orthogonal frequency division multiplexed symbol.

22. A reference signal transmission apparatus for use in a first communication node, comprising:

the configuration module is used for configuring channel state information reference signal resource parameters for the second communication node and sending the channel state information reference signal resource parameters to the second communication node;

a transmitting module, configured to transmit the channel state information reference signal to the second communication node according to the channel state information reference signal resource parameter, where the transmitting module maps the channel state information reference signal on a time-frequency resource corresponding to the channel state information reference signal port index number according to the channel state information reference signal port index number, and transmits the channel state information reference signal; wherein the channel state information reference signal resource parameters include: index number of OFDM symbol used for channel state information reference signal.

23. A reference signal transmission apparatus for use in a second communication node, comprising:

the first receiving module is used for receiving channel state information reference signal resource parameters sent by the first communication node;

the second receiving module receives the channel state information reference signal sent by the first communication node according to the channel state information reference signal resource parameter, wherein the channel state information reference signal is received on a time-frequency resource corresponding to a channel state information reference signal port index number of the channel state information reference signal; wherein the channel state information reference signal resource parameters include: index number of OFDM symbol used for channel state information reference signal.

24. A first communication node, comprising:

the first processor is used for configuring channel state information reference signal resource parameters for the second communication node, and mapping the channel state information reference signal on a time-frequency resource corresponding to the channel state information reference signal port index number according to the channel state information reference signal port index number;

a first communication device, configured to send the channel state information reference signal resource parameter to a second communication node, and send the channel state information reference signal to the second communication node on the time-frequency resource according to the channel state information reference signal resource parameter; wherein the channel state information reference signal resource parameters include: index number of OFDM symbol used for channel state information reference signal.

25. A second communication node, comprising:

a second communication device, configured to receive a channel state information reference signal resource parameter sent by the first communication node;

a second processor, configured to receive, according to the channel state information reference signal resource parameter, a channel state information reference signal sent by a first communication node, where the processor receives, by using the second communication device, the channel state information reference signal on a time-frequency resource corresponding to a channel state information reference signal port index number of the channel state information reference signal; wherein the channel state information reference signal resource parameters include: index number of OFDM symbol used for channel state information reference signal.

26. A storage medium comprising a stored program, wherein the program when run performs the method of any one of the preceding claims 1 to 10, and the method of any one of the preceding claims 11 to 21.

27. A processor for running a program, wherein the program when run performs the method of any one of the preceding claims 1 to 10 and the method of any one of the preceding claims 11 to 21.

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