CN102957654B - The transmission method and device of a kind of reference signal - Google Patents
The transmission method and device of a kind of reference signal Download PDFInfo
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- CN102957654B CN102957654B CN201110251220.8A CN201110251220A CN102957654B CN 102957654 B CN102957654 B CN 102957654B CN 201110251220 A CN201110251220 A CN 201110251220A CN 102957654 B CN102957654 B CN 102957654B
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Abstract
The invention discloses a kind of transmission method of reference signal, methods described includes：It is configured at least two reference signals that demodulation of downlink transmits data：First reference signal and the second reference signal；In downlink transmission data, first reference signal and/or the second reference signal are transmitted.The invention also discloses a kind of Transmission system of reference signal, solve the problems, such as to take into account the reference signal transmission under different communication scene, not only, with backwards compatibility, the i.e. compatible existing systems of LTE/LTE A Release 10, and communication scenes that can be applied under more communication scenes, such as high-speed motion state etc., the transmission of reference signal is more flexible, so as to ensure that communication performance can be optimal under different scenes.
Description
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a method and an apparatus for transmitting a reference signal.
Background
The Third Generation Partnership project (3 GPP) Long Term Evolution (LTE), Long Term Evolution-Advanced (LTE-a) system is based on OFDM technology. In OFDM technology, the communication resources are in the form of two dimensions, time-frequency.
As shown in fig. 1, for the LTE/LTE-a system, the communication resources of the uplink and downlink are divided in time direction by frame (frame), each radio frame (radio frame) has a length of 10 ms, and includes 10 subframes (sub-frames) with a length of 1 ms, and each subframe includes two slots (slots) with a length of 0.5 ms. According to the difference of the Cyclic Prefix (CP) length, each subframe may include 14 or 12 OFDM symbols, when the subframe adopts a Normal CP (Normal CP) length, the subframe includes 14 OFDM symbols, and when the subframe adopts an Extended CP (Extended CP) length, the subframe includes 12 OFDM symbols, which correspond to 7 OFDM symbols and 6 OFDM symbols respectively for each slot. In the frequency direction, resources are divided in units of subcarriers (subcarriers). Specifically, in communication, the minimum unit of frequency domain Resource allocation is a Resource Block (RB), and one Physical Resource Block (PRB) corresponding to a Physical Resource includes 12 subcarriers in a frequency domainCorresponding to one time slot of the time domain. The Resource corresponding to one subcarrier on each OFDM symbol is called a Resource Element (RE). FIG. 2 is a diagram illustrating transmission of CRS (Cell-specific Reference Signal) in LTE/LTE-A system, where CRS may be only shown in FIG. 2 in some scenariosA portion of the OFDM symbols shown may be transmitted on OFDM, or CRS may not be transmitted in any of the OFDM symbols in the resources shown in fig. 2.
Currently, the development requirements of mobile communication are to support higher transmission rate, more perfect signal coverage and higher resource utilization. For example, mobile communication needs to ensure the requirements for communication performance in various special scenes, such as high-speed moving scenes, and the relative speed between the transmitting end and the receiving end is greater than 300km/h, even up to 500km/h or more.
On one hand, in a high-speed moving state, there are two main factors affecting the performance: doppler shift increases and channel coherence time shortens. In an Orthogonal Frequency Division Multiplexing (OFDM) system, doppler shift causes orthogonality between subcarriers to be destroyed, and a decrease in channel coherence time causes channel variation in the time domain to be significant, resulting in an increase in demodulation difficulty. Both of these factors can severely impact the performance of the wireless communication system. A typical scenario for high speed motion is high-speed rail communication. In order to solve the problems that a large number of User Equipments (UEs) in a high-speed rail are frequently switched due to high-speed movement and communication performance is reduced due to the high-speed movement, a Relay Node (RN) is installed on the high-speed rail, and data between the UEs and the base station are exchanged by forwarding of the RN. For the UE, a link between the UE and the RN as an access node is relatively stable, and it is mainly required to optimize communication of the link between the RN and the base station to ensure reliable communication performance between the RN and the base station. On a link between the base station and the RN, the transmitting end and the receiving end are in a relatively high-speed moving state, and the reasonable design and transmission of the reference signal (RS, ReferenceSignal) are the precondition for ensuring reliable communication between the base station and the RN.
On the other hand, wireless broadband is increasingly widely used, for example, terminal devices such as notebook computers and the like with built-in wireless network connection modules are increasingly popularized, and one characteristic of such devices is that mobility is small, for example, the device and an access node (for example, a base station) are in a relatively static state, a link is very stable, and thus requirements for reference signal density and the like are low.
Therefore, in future wireless communication, communication scenarios are more and more diversified, new requirements are put on the design of the system, and the optimal criterion for the reference signal is to ensure reliable communication in different scenarios. In the existing reference signal transmission, for example, in LTE Release-10 version, only one set of reference signals for demodulation may not meet the data demodulation requirements in various special scenarios, thereby affecting the system performance.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a method and an apparatus for transmitting a reference signal, which can meet the data demodulation requirements in various scenarios, thereby improving the performance of a communication system.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a transmission method of a reference signal, which comprises the following steps:
at least two reference signals configured for demodulating downlink transmitted data: a first reference signal and a second reference signal;
transmitting the first reference signal and/or the second reference signal when transmitting data in downlink.
In the above scheme, the transmitting the first reference signal and/or the second reference signal includes: the transmitting side determines to use the first reference signal or the second reference signal currently according to the type of the receiving side, and/or the state of the receiving side, and/or the current channel condition, and/or the indication of the receiving side, and transmits the first reference signal or the second reference signal to the receiving side in downlink, and the receiving side receives the first reference signal or the second reference signal.
In the above scheme, the transmitting the first reference signal and/or the second reference signal includes: the method comprises the steps that a transmitting side transmits a first reference signal and a second reference signal in a downlink, a receiving side determines that the first reference signal or the second reference signal is needed to be used currently according to the indication of the transmitting side, and/or the type of the receiving side, and/or the state of the receiving side, and/or the channel condition, and receives the first reference signal or the second reference signal which is needed to be used currently.
In the scheme, the first reference signal and the UE-specific demodulation reference signal of the LTE Release-10 system have the same format.
In the above scheme, transmitting the second reference signal includes: transmitting the second reference signal in 6 or 8 OFDM symbols within one subframe.
In the above scheme, transmitting the second reference signal includes: transmitting the second reference signal in the 6 th, 7 th, 10 th, 11 th, 13 th and 14 th OFDM symbols within a subframe when the subframe of the downlink has a normal CP length; alternatively, the second reference signal is transmitted in 1 st, 2 nd, 7 th, 8 th, 13 th and 14 th OFDM symbols within a subframe.
In the above scheme, transmitting the second reference signal includes: transmitting the second reference signal in 3 rd, 4 th, 6 th, 7 th, 10 th, 11 th, 13 th and 14 th OFDM symbols within a subframe when the subframe of the downlink has a normal CP length; alternatively, the second reference signal is transmitted in 1 st, 2 nd, 5 th, 6 th, 9 th, 10 th, 13 th and 14 th OFDM symbols within a subframe.
In the foregoing scheme, transmitting the second reference signal further includes: and within one resource block, occupying 2 subcarriers or 3 subcarriers in the frequency domain to transmit the second reference signal corresponding to one port.
In the above scheme, the 2 subcarriers are 2 subcarriers spaced by 9 subcarriers in the resource block, or 2 subcarriers spaced by 5 subcarriers; and/or the 3 subcarriers are 3 subcarriers separated by 4 subcarriers in the resource.
In the above scheme, the 2 subcarriers are the 1 st and 11 th subcarriers, or the 2 nd and 12 th subcarriers, or the 3 rd and 9 th subcarriers, or the 4 th and 10 th subcarriers in the resource block.
In the above scheme, the at least two reference signals further include: a third reference signal;
the method further comprises the following steps: transmitting the first reference signal, and/or the second reference signal, and/or the third reference signal when transmitting data in downlink.
In the foregoing scheme, the transmitting the third reference signal includes: transmitting the third reference signal in 2 OFDM symbols within one subframe.
In the foregoing scheme, the transmitting the third reference signal includes: transmitting the third reference signal in 13 th and 14 th OFDM symbols within a subframe when the subframe of the downlink has a normal CP length.
In the foregoing scheme, transmitting the third reference signal further includes: and within one resource block, occupying 2 or 3 subcarriers in the frequency domain to transmit the third reference signal corresponding to one port.
The invention also provides a transmission system of reference signals, which comprises: a configuration unit and a transmission unit, wherein,
a configuration unit for configuring at least two reference signals for demodulating downlink transmitted data: a first reference signal and a second reference signal;
a transmission unit, configured to transmit the first reference signal and/or the second reference signal when data is transmitted in a downlink.
In the above scheme, the transmission unit includes a sending module disposed at a sending side and a receiving module disposed at a receiving side; wherein,
a sending module of the sending side, configured to determine, according to a type of the receiving side, and/or a state of the receiving side, and/or a current channel condition, and/or an indication of the receiving side, that a first reference signal or a second reference signal is currently used, and send the first reference signal or the second reference signal in a downlink;
and the receiving module at the receiving side is used for receiving the first reference signal or the second reference signal sent by the sending module at the sending side.
In the above scheme, the transmitting module on the transmitting side may be further configured to transmit a first reference signal and a second reference signal in a downlink; the receiving module of the receiving side may be further configured to determine that the first reference signal or the second reference signal needs to be used currently according to the indication of the transmitting side, and/or the type of the receiving side, and/or the state of the receiving side, and/or the channel condition, and select and receive the first reference signal or the second reference signal that needs to be used currently from the first reference signal and the second reference signal sent by the sending module of the transmitting side.
In the foregoing scheme, the configuration unit is further configured to configure a third reference signal;
the transmission unit is further configured to transmit the first reference signal, the second reference signal, and/or the third reference signal when data is transmitted in a downlink.
The reference signal transmission method and the reference signal transmission system have the advantages that at least two reference signals are configured, when data are transmitted in a downlink, the first reference signal and/or the second reference signal used for demodulating the data are/is transmitted, so that the data can be demodulated by adopting the corresponding reference signals according to link requirements in the data transmission process, the problem of reference signal transmission under different communication scenes is solved, the backward compatibility is realized, the existing LTE/LTE-A Release-10 system is compatible, the reference signal transmission method and the reference signal transmission system can be suitable for more communication scenes such as the communication scene under a high-speed motion state, the transmission of the reference signals is more flexible, and the optimal communication performance under different scenes can be ensured.
Drawings
FIG. 1 is a frame structure diagram of an LTE/LTE-A system;
FIG. 2 is a schematic transmission diagram of a CRS of an LTE/LTE-A system;
FIG. 3 is a block diagram of a reference signal transmission system according to the present invention;
FIG. 4 is a diagram illustrating transmission of a first reference signal according to the present invention;
fig. 5 is a diagram illustrating transmission of a second reference signal according to an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating another transmission of a second reference signal according to an embodiment of the invention;
fig. 7 is a diagram illustrating transmission of a second reference signal according to a second embodiment of the present invention;
fig. 8 is a schematic diagram illustrating another transmission of a second reference signal according to a second embodiment of the present invention;
fig. 9 is a diagram illustrating transmission of a second reference signal according to a third embodiment of the present invention;
fig. 10 is a diagram illustrating transmission of a second reference signal according to a fourth embodiment of the present invention;
fig. 11 is a schematic diagram illustrating another transmission of a second reference signal according to a fourth embodiment of the present invention;
fig. 12 is a diagram illustrating transmission of a third reference signal according to a fifth embodiment of the present invention;
fig. 13 is a schematic diagram illustrating another transmission of a third reference signal according to a fourth embodiment of the present invention;
fig. 14 is another transmission diagram of a third reference signal according to a fourth embodiment of the present invention.
Detailed Description
The basic idea of the invention is: at least two reference signals, namely a first reference signal and a second reference signal, are transmitted in a downlink, and one of the reference signals can be selectively transmitted according to the current data demodulation requirement, so that different reference signals can be transmitted under different scenes, and the data demodulation performance under different scenes can be ensured.
In order to ensure backward compatibility, the first Reference Signal, i.e. the downlink Demodulation Reference Signal (DMRS) Of the existing system (Rel-10 system, i.e. 3gpp LTE/LTE-a Release-10 system), or UE-specific Reference Signal (UE-specific Reference Signal) may be defined, and the second Reference Signal may have a higher density in the time domain than the first Reference Signal, and may be used for communication with a smaller channel coherence time (e.g. high speed scenario) and data Demodulation performance with a smaller channel coherence time, or may have a lower density in the frequency domain than the first Reference Signal, and may be used for communication with a larger channel coherence bandwidth, e.g. Line-Of-Signal (LOS) scenario, or may have a higher density in the time domain than the first Reference Signal, and may be used for communication with a smaller channel coherence bandwidth, e.g. Line-Of-Signal (LOS) scenario, or the second Reference Signal may have a higher density in the time domain than the first Reference Signal, The density in the frequency domain is small, and the method is suitable for scenes with small channel coherence time and large channel coherence bandwidth. Further, a third reference signal can be added as a demodulation reference signal of a downlink. The third reference signal has smaller time domain and/or frequency domain density than the first reference signal, and is used for data demodulation when the channel coherence time is longer.
The reference signal transmission method mainly comprises the following steps: at least two reference signals configured for demodulating downlink transmitted data: a first reference signal and a second reference signal; transmitting the first reference signal and/or the second reference signal when transmitting data in downlink.
Specifically, transmitting the first reference signal and/or the second reference signal includes: the transmitting side determines to use the first reference signal or the second reference signal currently according to the type of the receiving side, and/or the state of the receiving side, and/or the current channel condition, and/or the indication of the receiving side, and transmits the first reference signal or the second reference signal to the receiving side in downlink, and the receiving side receives the first reference signal or the second reference signal.
Alternatively, transmitting the first reference signal and/or the second reference signal comprises: the method comprises the steps that a transmitting side transmits a first reference signal and a second reference signal in a downlink, a receiving side determines that the first reference signal or the second reference signal is needed to be used currently according to the indication of the transmitting side, and/or the type of the receiving side, and/or the state of the receiving side, and/or the channel condition, and receives the first reference signal or the second reference signal which is needed to be used currently.
Here, the state of the reception side includes a motion state of the reception side, for example, whether or not it is in a high-speed moving state, and the like. The reference signal used for determining according to the channel condition may specifically be a parameter that currently characterizes a current channel state, and the reference signal used for determining according to the parameter.
When configuring the reference signals, the channel conditions (e.g., a value range of a parameter used for characterizing the channel conditions), and/or receiving side states (e.g., a high-speed moving state, a stable state, etc.), and/or receiving side types (e.g., a high-speed moving terminal, a stable state terminal, etc.) to which each reference signal is applicable may be configured in advance. Thus, the transmitting side can determine the reference signal to be used according to the corresponding information. Further, it is also possible to specify a reference signal to be used on the transmitting side or the receiving side in advance before the transmission of the reference signal.
Correspondingly, the present invention further provides a reference signal transmission system, as shown in fig. 3, the system includes: a configuration unit and a transmission unit, wherein the configuration unit is used for configuring at least two reference signals for demodulating data transmitted by downlink: a first reference signal and a second reference signal; a transmission unit, configured to transmit the first reference signal and/or the second reference signal when data is transmitted in a downlink.
Specifically, the transmission unit may include a transmitting module disposed at a transmitting side and a receiving module disposed at a receiving side, where the transmitting module at the transmitting side is configured to determine that the first reference signal or the second reference signal is currently used according to a type of the receiving side, and/or a state of the receiving side, and/or a current channel condition, and/or an indication of the receiving side, and transmit the first reference signal or the second reference signal in a downlink; and the receiving module at the receiving side is used for receiving the first reference signal or the second reference signal sent by the sending module at the sending side.
The sending module at the sending side may be further configured to send a first reference signal and a second reference signal in a downlink; the receiving module of the receiving side may be further configured to determine that the first reference signal or the second reference signal needs to be used currently according to the indication of the transmitting side, and/or the type of the receiving side, and/or the state of the receiving side, and/or the channel condition, and select and receive the first reference signal or the second reference signal that needs to be used currently from the first reference signal and the second reference signal sent by the sending module of the transmitting side.
The transmitting side may include a base station or a relay station, and the receiving side may include a terminal and/or an RN communicating with the base station. The above-described configuration unit may be provided on both the transmission side and the reception side, or may be provided only on the transmission side.
Each reference signal in the present invention is used for data demodulation and is transmitted only in the resource block allocated for data transmission. The reference signal supports the demodulation of multi-layer multiplexing data, and when the data is transmitted in multiple layers, the number of ports for transmitting the reference signal is the same as the number of data layers, namely, each layer of data corresponds to the reference signal of one port.
Specifically, transmitting the second reference signal further includes: transmitting the second reference signal in 6 or 8 OFDM symbols within one subframe; wherein the positions of every two OFDM symbols in the 8 OFDM symbols are adjacent.
Transmitting the second reference signal, comprising: and within one resource block, occupying 2 subcarriers or 3 subcarriers in the frequency domain to transmit the second reference signal corresponding to one port. The 2 subcarriers are 2 subcarriers spaced by 9 subcarriers or 2 subcarriers spaced by 5 subcarriers in the resource block. And/or the 3 subcarriers are 3 subcarriers separated by 4 subcarriers in the resource.
The at least two reference signals further include: a third reference signal; the method may further comprise: transmitting the first reference signal, and/or the second reference signal, and/or the third reference signal when transmitting data in downlink.
Specifically, the third reference signal may be transmitted in 2 OFDM symbols within one subframe.
Within one resource block, the third reference signal corresponding to one port may be transmitted occupying 2 or 3 subcarriers in the frequency domain.
Correspondingly, the configuration unit is further configured to configure a third reference signal; the transmission unit is further configured to transmit the first reference signal, the second reference signal, and/or the third reference signal when data is transmitted in a downlink.
Wherein the first reference signal has the same format as a UE-specific demodulation reference signal of an LTE Release-10 system.
Specifically, the transmission structure of the first reference signal is shown in fig. 4, the first reference signal is divided into two groups, as shown in fig. 4,representing a first set of first reference signals,representing a second group of first reference signals, wherein the orthogonality is kept between each group by adopting a Frequency Division Multiplexing (FDM) mode, namely the subcarriers occupied by the two groups of first reference signals in the Frequency domain are different; in each group, multiplexing a plurality of ports by using Code Division Multiplexing (CDM) to transmit a first reference signal, where each group can multiplex 4 layers at most, specifically, as shown by a solid ellipse in fig. 4, spreading two adjacent reference signals REs by using an Orthogonal Code (OCC) with a length of 2, which can ensure that the first reference signal multiplexes two ports in each group, as shown by a dotted ellipse in fig. 4, spreading 4 reference signals REs on one reference signal subcarrier in one resource block pair by using an OCC with a length of 4, which can ensure that the reference signal multiplexes 4 ports in each group at most, and thus, can support data transmission of 8 layers at most.
Example one
This embodiment describes a method for transmitting a second reference signal, specifically, the second reference signal is increased in density in the time domain and is the same as the first reference signal in density in the frequency domain compared to the first reference signal.
As shown in fig. 5, in a downlink subframe having a normal CP length, the second reference signal is transmitted in the 6 th, 7 th, 10 th, 11 th, 13 th, 14 th OFDM symbols in one subframe, that is, the second reference signal is transmitted in the 6 th OFDM symbols numbered 5, 6, 9, 10, 12, 13 in fig. 5; as shown in fig. 5, in one resource block, 3 subcarriers are occupied in the frequency domain to transmit a second reference signal corresponding to one port, and 4 subcarriers are spaced between two adjacent subcarriers in the 3 subcarriers.
As shown in fig. 5, the second reference signal can support 4-layer transmission in this embodiment. In particular, the reference signals in fig. 5 include two groups,representing a first set of second reference signals,indicating a second group of second reference signals, the two groups of second reference signals are multiplexed by FDM, as shown by the solid oval in fig. 5, and OCC with length of 2 is used in each group to spread on two adjacent reference signals RE, so that one group can support the transmission of the second reference signals of 2 ports, and the reference signals of the two groups can support the transmission of 4 ports.
When the 1 st OFDM symbol (the OFDM symbol numbered as symbol 0) in the subframe is also used for data transmission for which the second reference signal is responsible for demodulation (for example, service data transmission in a dedicated carrier), the reference signal pattern shown in fig. 6 may be used to transmit the second reference signal, where the second reference signal is transmitted in the 1 st, 2 nd, 7 th, 8 th, 13 th, and 14 th OFDM symbols in one subframe, that is, the second reference signal is transmitted in the 6 OFDM symbols numbered as 0, 1 th, 6 th, 7 th, 12 th, and 13 th in fig. 6, and in one resource block, 3 subcarriers are occupied in a frequency domain to transmit the second reference signal corresponding to one port, and 4 subcarriers are spaced between two adjacent subcarriers in the 3 subcarriers, and the multiplexing manner is the same as that described above, and is not repeated.
Example two
This embodiment describes a method for transmitting a second reference signal, specifically, the second reference signal is increased in density in the time domain and is the same as the first reference signal in density in the frequency domain compared to the first reference signal.
As shown in fig. 7, in a downlink subframe having a normal CP length, the second reference signal is transmitted in 3 rd, 4 th, 6 th, 7 th, 10 th, 11 th, 13 th and 14 th OFDM symbols in one subframe, i.e. the second reference signal is transmitted in 8 OFDM symbols numbered 2, 3, 5, 6 th, 9 th, 10 th, 12 th and 13 th in fig. 7; as shown in fig. 7, in one resource block, 3 subcarriers are occupied in the frequency domain to transmit a second reference signal corresponding to one port, and 4 subcarriers are spaced between two adjacent subcarriers in the 3 subcarriers.
The reference signal in figure 7 comprises two groups,representing a first set of second reference signals,representing the second set of second reference signals, the two sets are multiplexed by FDM, as shown by the solid oval in fig. 7, OCC with length 2 is used in each set to spread on two adjacent reference signals RE, so that one set of second reference signals can support 2-port transmission, and two sets of second reference signals can support 4-port transmission.
If it is required to support data transmission of more than 4 layers, then length-4 OCCs may be used for CDM multiplexing, and specifically, length-4 OCCs may be used for spreading on four adjacent reference signals REs in one timeslot in each group, as shown by the dashed ellipses in fig. 7, so that one group of second reference signals may support 4-port transmission and two groups of second reference signals may support 8-port transmission.
The pattern in fig. 8 may be used for transmission of the second reference signal if the first few OFDM symbols in the subframe are also used for transmission of the demodulated data for the second reference signal. Specifically, as shown in fig. 8, in a downlink subframe having a normal CP length, the second reference signal is transmitted in 1 st, 2 nd, 5 th, 6 th, 9 th, 10 th, 13 th and 14 th OFDM symbols in one subframe, that is, the second reference signal is transmitted in 8 OFDM symbols numbered 0, 1, 4, 5 th, 8 th, 9 th, 12 th and 13 th in fig. 8, respectively; as shown in fig. 8, in a resource block, 3 subcarriers are occupied in the frequency domain to transmit a second reference signal corresponding to a port, 4 subcarriers are spaced between two adjacent subcarriers in the 3 subcarriers, and the multiplexing method is the same as that described above and is not described again.
EXAMPLE III
The present embodiment describes a transmission method of a second reference signal, specifically, the second reference signal has a density reduced in a frequency domain compared to the first reference signal, and is the same as the first reference signal in a time domain density, so that the second reference signal can be used for data demodulation when a channel coherence bandwidth is large.
Specifically, as shown in fig. 9, in a downlink subframe having a normal CP length, the second reference signal is transmitted in the 6 th, 7 th, 13 th and 14 th OFDM symbols in one subframe, that is, the second reference signal is transmitted in the 4 OFDM symbols numbered 5, 6, 12 and 13 in fig. 9; as shown in fig. 9, the second reference signal includes two groups,representing a first set of second reference signals,a second group of second reference signals is shown, and in one resource block, the second reference signals corresponding to one port are transmitted by occupying 2 subcarriers in the frequency domain, the 2 subcarriers are separated by 9 subcarriers, specifically, the first group of second reference signals occupies 2 nd and 12 th subcarriers, i.e., two subcarriers numbered 1 and 11 in fig. 9, and the second group of second reference signals occupies 1 st and 11 th subcarriers, i.e., two subcarriers numbered 0 and 10 in fig. 9.
As shown in fig. 9, the two groups of second reference signals can support 8-layer transmission at maximum, and the multiplexing manner of the second reference signals of different ports is the same as that of the foregoing embodiment, and is not repeated.
Example four
The present embodiment describes a transmission method of a second reference signal, specifically, the second reference signal has a density reduced in a frequency domain compared to the first reference signal, and is the same as the first reference signal in a time domain density, so that the second reference signal can be used for data demodulation when a channel coherence bandwidth is large.
Specifically, as shown in fig. 10, in a downlink subframe having a normal CP length, the second reference signal is transmitted in the 6 th, 7 th, 13 th and 14 th OFDM symbols in one subframe, that is, the second reference signal is transmitted in the 4 OFDM symbols numbered 5, 6, 12 and 13 in fig. 10; as shown in fig. 10, the second reference signal includes two groups,representing a first set of second reference signals,a second group of second reference signals is shown, and in one resource block, the second reference signals corresponding to one port are transmitted by occupying 2 subcarriers in the frequency domain, the 2 subcarriers are separated by 5 subcarriers, specifically, the first group of second reference signals occupies 4 th and 10 th subcarriers, that is, two subcarriers numbered as 3 and 9 in fig. 10, and the second group of second reference signals occupies 3 rd and 9 th subcarriers, that is, two subcarriers numbered as 2 and 8 in fig. 10.
As shown in fig. 10, the two groups of second reference signals can support 8-layer transmission at maximum, and the multiplexing manner of the second reference signals of different ports is the same as that of the foregoing embodiment, and is not repeated.
Further, the frequency domain subcarrier positions of the second reference signal transmission may be fixed in the resource block as shown in fig. 10, or shifted (shift) in the frequency domain based on some specific parameters, that is, intervals between subcarriers occupied by the second reference signal of the same port in one resource block are the same, but specific subcarrier positions may be obtained by calculation based on some specific parameters, for example, the subcarrier positions of the second reference signal may be determined based on a number obtained after the cell identification module 6, if the number obtained after the module 6 is 0, the subcarrier positions to which two groups of second reference signals are mapped start mapping from numbers 0 and 1 in the resource block, that is, the 1 st and 2 nd subcarriers, at this time, the transmission positions of the second reference signals are shown in fig. 11. And the other cases are analogized in turn.
In practical application, when the position of the subcarrier transmitted by the second reference signal is fixed, the transmission process is relatively simple, and the position of the subcarrier transmitted by the second reference signal is shifted, so that the reference signal interference of an adjacent cell can be effectively avoided.
EXAMPLE five
This embodiment describes a sending method of a third reference signal, which has a sparser density in the time domain than the first reference signal and is used for data demodulation when the channel coherence time is longer. Specifically, the third reference signal is transmitted on two OFDM symbols within one subframe.
As shown in fig. 12, when the downlink subframe has a normal CP length, the third reference signal is transmitted in 13 th and 14 th OFDM symbols within the subframe, i.e., the third reference signal is transmitted on two OFDM symbols numbered 12 and 13 in fig. 12; and in one resource block, 3 subcarriers are occupied in the frequency domain to transmit a third reference signal corresponding to one port, and 4 subcarriers are arranged between every two adjacent subcarriers in the 3 subcarriers. As shown in fig. 12, the third reference signal includes two groups,representing a first set of third reference signals,representing a second set of third reference signals occupying the 2 nd, 7 th and 12 th sub-carriers, i.e. the three sub-carriers numbered 1, 6, 11 in fig. 12, the second set of third reference signalsOccupying the 1 st, 6 th and 11 th sub-carriers, i.e. the three sub-carriers numbered 0, 5, 10 in fig. 12. Since there are only 2 reference signals RE on one reference signal subcarrier, only OCCs with length of 2 can be used in one group, that is, 2-port reference signal transmission can be supported in one group, and two reference signal groups in fig. 12 can support third reference signal transmission with maximum 4 ports, that is, 4-layer data is multiplexed.
It can also be considered to further reduce the density of the reference signals in the frequency domain to improve the transmission performance in the scenario of large channel coherence bandwidth. As shown in fig. 13, when the downlink subframe has a normal CP length, the third reference signal is transmitted in the 13 th and 14 th OFDM symbols within the subframe, i.e., the third reference signal is transmitted on the two OFDM symbols numbered 12 and 13 in fig. 13; and in one resource block, 2 subcarriers are occupied in the frequency domain to transmit a third reference signal corresponding to one port, and 9 subcarriers are arranged between every two adjacent subcarriers in the 2 subcarriers. As shown in fig. 13, the third reference signal includes two groups,representing a first set of third reference signals,the second group of third reference signals are represented, the first group of third reference signals occupies the 2 nd and 12 th subcarriers, i.e., two subcarriers numbered 1 and 11 in fig. 13, the second group of third reference signals occupies the 1 st and 11 th subcarriers, i.e., two subcarriers numbered 0 and 10 in fig. 13, and the multiplexing mode at the time of multiport is the same as that in fig. 12, and is not repeated.
Alternatively, as shown in fig. 14, when the downlink subframe has a normal CP length, the third reference signal is transmitted in the 13 th and 14 th OFDM symbols within the subframe, i.e., the third reference signal is transmitted on the two OFDM symbols numbered 12 and 13 in fig. 13; in a resource block, occupying 2 subcarriers in the frequency domain to transmit a third reference signal corresponding to a port, wherein the interval between two adjacent subcarriers in the 2 subcarriers5 sub-carriers. As shown in fig. 14, the third reference signal includes two groups,representing a first set of third reference signals,the second group of third reference signals are represented, the first group of third reference signals occupies the 4 th and 10 th subcarriers, i.e., two subcarriers numbered as 3 and 9 in fig. 13, the second group of third reference signals occupies the 3 rd and 9 th subcarriers, i.e., two subcarriers numbered as 2 and 8 in fig. 13, and the multiplexing manner when the ports are multi-ported is the same as that in fig. 12, and is not described again. Similarly, the frequency domain subcarrier mapped by the third reference signal may be fixed, or may be shifted based on a specific parameter, and a specific implementation process is similar to the related implementation process in the fourth embodiment and is not described again.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (17)
1. A method for transmitting a reference signal, the method comprising:
at least two reference signals configured for demodulating downlink transmitted data: a first reference signal and a second reference signal; wherein the density of the second reference signal in the time domain is greater than the first reference signal; or the density of the second reference signal in the frequency domain is smaller than that of the first reference signal; or the density of the second reference signal in the time domain is greater than that of the first reference signal and the density of the second reference signal in the frequency domain is less than that of the first reference signal; the first reference signal and a UE-specific demodulation reference signal of an LTE Release-10 system have the same format;
transmitting the first reference signal and/or the second reference signal when transmitting data in downlink.
2. The method for transmitting reference signals according to claim 1,
the transmitting the first reference signal and/or the second reference signal comprises: the transmitting side determines to use the first reference signal or the second reference signal currently according to the type of the receiving side, and/or the state of the receiving side, and/or the current channel condition, and/or the indication of the receiving side, and transmits the first reference signal or the second reference signal to the receiving side in downlink, and the receiving side receives the first reference signal or the second reference signal.
3. The method for transmitting reference signals according to claim 1,
the transmitting the first reference signal and/or the second reference signal comprises: the method comprises the steps that a transmitting side transmits a first reference signal and a second reference signal in a downlink, a receiving side determines that the first reference signal or the second reference signal is needed to be used currently according to the indication of the transmitting side, and/or the type of the receiving side, and/or the state of the receiving side, and/or the channel condition, and receives the first reference signal or the second reference signal which is needed to be used currently.
4. The method according to claim 1, wherein transmitting the second reference signal comprises:
transmitting the second reference signal in 6 or 8 OFDM symbols within one subframe.
5. The method according to claim 1 or 4, wherein transmitting the second reference signal comprises:
transmitting the second reference signal in the 6 th, 7 th, 10 th, 11 th, 13 th and 14 th OFDM symbols within a subframe when the subframe of the downlink has a normal CP length; alternatively, the second reference signal is transmitted in 1 st, 2 nd, 7 th, 8 th, 13 th and 14 th OFDM symbols within a subframe.
6. The method according to claim 1 or 4, wherein transmitting the second reference signal comprises:
transmitting the second reference signal in 3 rd, 4 th, 6 th, 7 th, 10 th, 11 th, 13 th and 14 th OFDM symbols within a subframe when the subframe of the downlink has a normal CP length; alternatively, the second reference signal is transmitted in 1 st, 2 nd, 5 th, 6 th, 9 th, 10 th, 13 th and 14 th OFDM symbols within a subframe.
7. The method for transmitting the reference signal according to any one of claims 1 to 4, wherein the transmitting the second reference signal further comprises:
and within one resource block, occupying 2 subcarriers or 3 subcarriers in the frequency domain to transmit the second reference signal corresponding to one port.
8. The method according to claim 7, wherein the reference signal is transmitted from the base station,
the 2 subcarriers are 2 subcarriers spaced by 9 subcarriers or 2 subcarriers spaced by 5 subcarriers in the resource block;
and/or the 3 subcarriers are 3 subcarriers separated by 4 subcarriers in the resource.
9. The method according to claim 8, wherein the reference signal is transmitted from the base station,
the 2 sub-carriers are the 1 st and 11 th sub-carriers, or the 2 nd and 12 th sub-carriers, or the 3 rd and 9 th sub-carriers, or the 4 th and 10 th sub-carriers in the resource block.
10. The method for transmitting reference signals according to claim 1,
the at least two reference signals further include: a third reference signal;
the method further comprises the following steps: transmitting the first reference signal, and/or the second reference signal, and/or the third reference signal when transmitting data in downlink.
11. The method according to claim 10, wherein the reference signal is transmitted from the base station,
the transmitting the third reference signal comprises: transmitting the third reference signal in 2 OFDM symbols within one subframe.
12. The method for transmitting the reference signal according to claim 10 or 11, wherein the transmitting the third reference signal comprises:
transmitting the third reference signal in 13 th and 14 th OFDM symbols within a subframe when the subframe of the downlink has a normal CP length.
13. The method for transmitting the reference signal according to claim 10 or 11, wherein the transmitting the third reference signal further comprises:
and within one resource block, occupying 2 or 3 subcarriers in the frequency domain to transmit the third reference signal corresponding to one port.
14. A transmission system for a reference signal, the system comprising: a configuration unit and a transmission unit, wherein,
a configuration unit for configuring at least two reference signals for demodulating downlink transmitted data: a first reference signal and a second reference signal; wherein the density of the second reference signal in the time domain is greater than the first reference signal; or the density of the second reference signal in the frequency domain is smaller than that of the first reference signal; or the density of the second reference signal in the time domain is greater than that of the first reference signal and the density of the second reference signal in the frequency domain is less than that of the first reference signal; the first reference signal and a UE-specific demodulation reference signal of an LTE Release-10 system have the same format;
a transmission unit, configured to transmit the first reference signal and/or the second reference signal when data is transmitted in a downlink.
15. The transmission system of the reference signal according to claim 14, wherein the transmission unit includes a transmission module provided at a transmission side and a reception module provided at a reception side; wherein,
a sending module of the sending side, configured to determine, according to a type of the receiving side, and/or a state of the receiving side, and/or a current channel condition, and/or an indication of the receiving side, that a first reference signal or a second reference signal is currently used, and send the first reference signal or the second reference signal in a downlink;
and the receiving module at the receiving side is used for receiving the first reference signal or the second reference signal sent by the sending module at the sending side.
16. The transmission system of reference signals according to claim 15,
a transmitting module on a transmitting side, further configured to transmit a first reference signal and a second reference signal in a downlink; the receiving module of the receiving side may be further configured to determine that the first reference signal or the second reference signal needs to be used currently according to the indication of the transmitting side, and/or the type of the receiving side, and/or the state of the receiving side, and/or the channel condition, and select and receive the first reference signal or the second reference signal that needs to be used currently from the first reference signal and the second reference signal sent by the sending module of the transmitting side.
17. The transmission system of reference signals according to any one of claims 14 to 16,
the configuration unit is further configured to configure a third reference signal;
the transmission unit is further configured to transmit the first reference signal, the second reference signal, and/or the third reference signal when data is transmitted in a downlink.
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| CN105519181B (en) * | 2013-09-25 | 2019-09-27 | 日电（中国）有限公司 | Method and apparatus for the uplink data transmission in wireless communication system |
| CN107210879B (en) * | 2015-06-30 | 2019-10-25 | 华为技术有限公司 | A kind of reference signal sending method and device |
| CN106549745A (en) * | 2015-09-17 | 2017-03-29 | 中兴通讯股份有限公司 | The sending method and device of reference signal, method of reseptance and device |
| US10524249B2 (en) | 2015-12-16 | 2019-12-31 | Zte Corporation | Data transmission method and apparatus |
| WO2017101607A1 (en) * | 2015-12-16 | 2017-06-22 | 中兴通讯股份有限公司 | Method and device for transmitting data |
| CN111130744B (en) | 2015-12-16 | 2021-10-26 | 中兴通讯股份有限公司 | Data transmission method and device |
| WO2017132861A1 (en) * | 2016-02-03 | 2017-08-10 | 华为技术有限公司 | Signal sending method, base station and user equipment |
| CN107888530B (en) | 2016-09-30 | 2021-01-22 | 电信科学技术研究院 | Transmission method, transmitting device and receiving device of phase noise compensation reference signal |
| CN115834010B (en) * | 2017-01-06 | 2024-09-20 | 中兴通讯股份有限公司 | Control channel reference signal transmitting and receiving method and device, base station and terminal |
| CN110912659B (en) * | 2018-09-14 | 2021-08-31 | 华为技术有限公司 | Information sending and receiving method, equipment and device |
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| CN101958865A (en) * | 2009-07-13 | 2011-01-26 | 重庆无线绿洲通信技术有限公司 | Method for generating demodulating reference signal and device thereof |
| CN102142916A (en) * | 2010-01-28 | 2011-08-03 | 华为技术有限公司 | Multiplexing method and multiplexing equipment of reference signal |
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| CN101714897B (en) * | 2009-11-12 | 2013-01-02 | 普天信息技术研究院有限公司 | Method for configuring sounding reference signals |
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| CN101958865A (en) * | 2009-07-13 | 2011-01-26 | 重庆无线绿洲通信技术有限公司 | Method for generating demodulating reference signal and device thereof |
| CN102142916A (en) * | 2010-01-28 | 2011-08-03 | 华为技术有限公司 | Multiplexing method and multiplexing equipment of reference signal |
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