CN102957654A - Method and device for transmitting reference signals - Google Patents
Method and device for transmitting reference signals Download PDFInfo
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- CN102957654A CN102957654A CN2011102512208A CN201110251220A CN102957654A CN 102957654 A CN102957654 A CN 102957654A CN 2011102512208 A CN2011102512208 A CN 2011102512208A CN 201110251220 A CN201110251220 A CN 201110251220A CN 102957654 A CN102957654 A CN 102957654A
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Abstract
The invention discloses a method for transmitting reference signals. The method comprises the following steps of: configuring at least two reference signals for demodulating the data transmitted by a down link, wherein the two reference signals include a first reference signal and a second reference signal; when the down link transmits data, transmitting the first reference signal and/or the second reference signal. The invention also discloses a transmission system of reference signals. The problem of balancing the reference signal transmission under different communication scenes is solved, the method and the system provided by the invention are not only compatible, namely being compatible to the conventional LTE (Long Term Evolution)/LTE-A (Advanced Long-Term Evolution) Release-10 system, but also can be suitable for more communication scenes, such as a communication scene in high-speed movement state, the transmission of the reference signals becomes more flexible, and the optimality of the communication performances under different scenes is guaranteed.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of transmission method and device of reference signal.
Background technology
Third generation partner program (3GPP, Third Generation Partnership Projects) Long Term Evolution (LTE, Long Term Evolution)/senior Long Term Evolution (LTE-A, Advanced Long-Term Evolution) system take the OFDM technology as the basis.In the OFDM technology, when the communication resource is-form of bidimensional frequently.
As shown in Figure 1, for the LTE/LTE-A system, the communication resource of up link and down link is to divide take frame (frame) as unit at time orientation, each radio frames (radio frame) length is 10 ms, the subframe (sub-frame) that to comprise 10 length be 1 ms, each subframe comprises that again length is two time slots (slot) of 0.5ms.According to Cyclic Prefix (CP, Cyclic Prefix) difference of length, each subframe can comprise 14 or 12 OFDM symbols, when subframe adopts common CP (Normal CP) length, comprise 14 OFDM symbols in the subframe, when subframe adopts expansion CP (Extended CP) length, comprise 12 OFDM symbols in the subframe, corresponding respectively to each time slot has 7 OFDM symbols and 6 OFDM symbols.In frequency direction, resource is divided take subcarrier (subcarrier) as unit.Specifically in communication, the least unit that frequency domain resource is distributed is Resource Block (RB, Resource Block), a Physical Resource Block (PRB of corresponding physical resource, Physical RB), a PRB comprises 12 subcarriers at frequency domain, corresponding to a time slot of time domain.The resource of a corresponding subcarrier is called Resource Unit (RE, Resource Element) on each OFDM symbol.Fig. 2 is a transmission schematic diagram of LTE/LTE-A system public reference signal (CRS, Cell-specific Reference Signal), and under some scenes, CRS may be only in Fig. 2
The upper transmission of a part of OFDM in the shown OFDM symbol, perhaps CRS may not transmit in any OFDM symbol in resource shown in Figure 2.
At present, the demand for development of mobile communication is to support higher transmission rate, more perfect signal to cover and higher resource utilization.For example, mobile communication need to guarantee under the various special screnes requirement for communication performance, and such as the scene of high-speed motion, transmitting terminal and receiving terminal relative velocity be greater than 300km/h, even reach 500km/h or higher.
On the one hand, under high-speed moving state, the principal element that affects performance has two: Doppler frequency shift increases and channel shortening coherence time.At OFDM (OFDM, Orthogonal Frequency Division Multiplexing) in the system, Doppler frequency shift causes the orthogonality between the subcarrier destroyed, and channel shortening coherence time causes channel at the variation highly significant of time domain, causes the difficulty of demodulation to increase.Above-mentioned these two factors all can have a strong impact on the performance of wireless communication system.The more typical scene of high-speed motion is high ferro communication.In order to solve a large number of users equipment (UE in the high ferro, User Equipment) the frequent switching because of high-speed mobile, and high-speed mobile causes the problem of communication performance decline, the technology of studying at present is in high ferro relay station (RN to be installed, Relay Node), the forwarding of crossing relay station of the data communication device between subscriber equipment and base station is carried out alternately.For UE, itself and be metastable as the link between the RN of access node, mainly be need to the communication of link between RN and the base station be optimized, guarantee between RN and the base station reliably communication performance.And on the link between base station and the RN, being in relative high-speed moving state between transmitting terminal and the receiving terminal, the appropriate design of reference signal (RS, Reference Signal) and transmission are the prerequisites that guarantees reliable communication between base station and the RN.
On the other hand, WiMAX is used increasingly extensive, terminal equipment such as built-in wireless network link blocks such as notebook computers will be day by day universal, and characteristics of this kind equipment are that mobility is very little, all be to be in relative static conditions between itself and the access node (for example base station) many times for example, link is highly stable, and is then lower for the requirements such as density of reference signal like this.
Therefore, in the radio communication in future, communication scenes is more and more diversified, the design of system has also been proposed Secretary, and for reference signal, its optimum criterion is the reliable communication that can guarantee under the different scenes.In the existing reference signal transmission, the reference signal that LTE Release-10 version for example, a cover that only comprises are used for demodulation may not satisfy the data demodulates demand under the various special screnes, thereby systematic function is impacted.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of transmission method and device of reference signal, can satisfy the data demodulates demand under the several scenes, thereby improves the performance of communication system.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides a kind of transmission method of reference signal, described method comprises:
Configuration is used at least two kinds of demodulation of downlink institute the transmission of data with reference to signal: the first reference signal and the second reference signal;
When downlink transmission data, transmit described the first reference signal and/or the second reference signal.
In such scheme, described the first reference signal of described transmission and/or the second reference signal, comprise: transmitter side is according to the state of the type of receiver side and/or receiver side and/or current channel conditions and/or the indication of receiver side, determine current use the first reference signal or the second reference signal, and in down link, sending described the first reference signal or the second reference signal to receiver side, receiver side receives described the first reference signal or the second reference signal.
In such scheme, described the first reference signal of described transmission and/or the second reference signal, comprise: transmitter side sends the first reference signal and the second reference signal in down link, receiver side is according to indication and/or self type and/or oneself state and/or the channel conditions of described transmitter side, determine that current need use described the first reference signal or the second reference signal, and receive current the first reference signal or the second reference signal that needs use.
In such scheme, described the first reference signal has identical form with the UE dedicated demodulation reference signal of LTE Release-10 system.
In such scheme, transmit described the second reference signal, comprising: described the second reference signal of transmission in a subframe 6 or 8 the OFDM symbols.
In such scheme, transmit described the second reference signal, comprising: when the subframe of described down link has common CP length, described the second reference signal of transmission in the 6th, 7,10,11,13 and 14 the OFDM symbol in subframe; Perhaps, described the second reference signal of transmission in the 1st, 2,7,8,13 and 14 the OFDM symbol in subframe.
In such scheme, transmit described the second reference signal, comprising: when the subframe of described down link has common CP length, described the second reference signal of transmission in the 3rd, 4,6,7,10,11,13 and 14 the OFDM symbol in subframe; Perhaps, described the second reference signal of transmission in the 1st, 2,5,6,9,10,13 and 14 the OFDM symbol in the subframe.
In such scheme, transmit described the second reference signal, also comprise: in a Resource Block, occupy described second reference signal of 2 subcarriers or 3 corresponding ports of sub-carrier transmission at frequency domain.
In such scheme, described 2 subcarriers are 2 subcarriers of 5 subcarriers of 2 subcarriers or intervals of 9 subcarriers in interval in Resource Block; And/or described 3 subcarriers are 3 subcarriers of 4 subcarriers in interval in resource.
In such scheme, described 2 subcarriers are the 1st and the 11st subcarrier or the 2nd and the 12nd subcarrier or the 3rd and the 9th subcarrier or the 4th and the 10th subcarrier in the Resource Block.
In such scheme, described at least two kinds with reference to signal, also comprise: the 3rd reference signal;
Described method also comprises: when downlink transmission data, transmit described the first reference signal and/or the second reference signal and/or the 3rd reference signal.
In such scheme, described the 3rd reference signal of described transmission comprises: described the 3rd reference signal of transmission in 2 OFDM symbols in a subframe.
In such scheme, described the 3rd reference signal of described transmission comprises: when the subframe of described down link has common CP length, and described the 3rd reference signal of transmission in the 13rd and 14 the OFDM symbol in subframe.
In such scheme, transmit described the 3rd reference signal, also comprise: in a Resource Block, occupy described the 3rd reference signal of 2 or 3 the corresponding ports of sub-carrier transmission at frequency domain.
The present invention also provides a kind of transmission system of reference signal, and described system comprises: dispensing unit and transmission unit, wherein,
Dispensing unit is used for configuration and is used at least two kinds of demodulation of downlink institute the transmission of data with reference to signal: the first reference signal and the second reference signal;
Transmission unit is used for transmitting described the first reference signal and/or the second reference signal when downlink transmission data.
In such scheme, described transmission unit comprises the sending module that is arranged on transmitter side and the receiver module that is arranged on receiver side; Wherein,
The sending module of transmitter side, be used for according to the state of the type of receiver side and/or receiver side and/or current channel conditions and/or the indication of receiver side, determine current use the first reference signal or the second reference signal, and in down link, send described the first reference signal or the second reference signal;
The receiver module of receiver side is used for receiving the first reference signal or the second reference signal that the sending module of described transmitter side sends.
In such scheme, the sending module of transmitter side can also be used for sending the first reference signal and the second reference signal at down link; The receiver module of receiver side, can also be used for indication and/or self type and/or oneself state and/or channel conditions according to described transmitter side, determine current described the first reference signal or the second reference signal need used, and current the first reference signal or the second reference signal used of needing of selective reception the first reference signal that sends from the sending module of described transmitter side and the second reference signal.
In such scheme, described dispensing unit also is used for configuration the 3rd reference signal;
Described transmission unit also is used for transmitting described the first reference signal and/or the second reference signal and/or the 3rd reference signal when downlink transmission data.
Reference signal transmission method and system of the present invention, by configuring at least two kinds with reference to signal, when downlink transmission data, transmission is used for the first reference signal and/or second reference signal of these data of demodulation, so that can adopt corresponding reference signal to carry out data demodulates according to the link needs in the data transmission procedure, thereby solved the reference signal transmission problem of taking into account under the different communication scene, not only, has backwards compatibility, namely compatibility has LTE/LTE-A Release-10 system now, and can be applicable to more communication scenes, such as communication scenes under the high-speed motion state etc., the transmission of reference signal is more flexible, thereby guarantees that communication performance all can reach optimum under the different scenes.
Description of drawings
Fig. 1 is the frame structure schematic diagram of LTE/LTE-A system;
Fig. 2 is the transmission schematic diagram of the CRS of LTE/LTE-A system;
Fig. 3 is the composition structure chart of transmitted reference system of the present invention;
Fig. 4 is the transmission schematic diagram of the present invention's the first reference signal;
Fig. 5 is a kind of transmission schematic diagram of the second reference signal in the embodiment of the invention one;
Fig. 6 is the another kind transmission schematic diagram of the second reference signal in the embodiment of the invention one;
Fig. 7 is a kind of transmission schematic diagram of the second reference signal in the embodiment of the invention two;
Fig. 8 is the another kind transmission schematic diagram of the second reference signal in the embodiment of the invention two;
Fig. 9 is the transmission schematic diagram of the second reference signal in the embodiment of the invention three;
Figure 10 is a kind of transmission schematic diagram of the second reference signal in the embodiment of the invention four;
Figure 11 is the another kind transmission schematic diagram of the second reference signal in the embodiment of the invention four;
Figure 12 is a kind of transmission schematic diagram of the 3rd reference signal in the embodiment of the invention five;
Figure 13 is the another kind transmission schematic diagram of the 3rd reference signal in the embodiment of the invention four;
Figure 14 is the another kind transmission schematic diagram of the 3rd reference signal in the embodiment of the invention four.
Embodiment
Basic thought of the present invention is: at least two kinds of downlink transmission with reference to signal, i.e. the first reference signal and the second reference signal, can be according to the needs of current data demodulation, select wherein a kind of reference signal of transmission, so, can satisfy the different reference signal of transmission under the different scenes, thereby guarantee the performance of data demodulates under the different scenes.
In order to guarantee backwards compatibility, can limit the first reference signal namely is existing system (Rel-10 system, be 3GPP LTE/LTE-A Release-10 system) down link demodulation reference signal (DMRS, Demodulation Reference Signal perhaps is called UE DRS (Dedicated Reference Signal) (UE-specific Reference Signal).With respect to the first reference signal, the second reference signal is larger in the density of time domain, is used for the channel communication of hour (for example High-speed Circumstance) coherence time, guarantees the channel coherence time of data demodulates performance hour; Perhaps, compared to the first reference signal, the second reference signal also can be less in the density of frequency domain, the communication when larger for the channel coherence bandwidth, for example communication under sighting distance (LOS, the Line-Of-Sight) scene; Perhaps, the second reference signal is large, less in the density of frequency domain compared to the density of the first reference signal on time domain, is applicable to the scene that channel coherence time is less and the channel coherence bandwidth is larger.Further, can also increase by the 3rd reference signal as the demodulated reference signal of down link.Described the 3rd reference signal is compared the first reference signal and is had less time domain and/or frequency domain density, is used for the channel coherence time of the data demodulates when larger.
Reference signal transmission method of the present invention mainly comprises: configuration is used at least two kinds of demodulation of downlink institute the transmission of data with reference to signal: the first reference signal and the second reference signal; When downlink transmission data, transmit described the first reference signal and/or the second reference signal.
Particularly, transmit described the first reference signal and/or the second reference signal, comprise: transmitter side is according to the state of the type of receiver side and/or receiver side and/or current channel conditions and/or the indication of receiver side, determine current use the first reference signal or the second reference signal, and in down link, sending described the first reference signal or the second reference signal to receiver side, receiver side receives described the first reference signal or the second reference signal.
Perhaps, transmit described the first reference signal and/or the second reference signal, comprise: transmitter side sends the first reference signal and the second reference signal in down link, receiver side is according to indication and/or self type and/or oneself state and/or the channel conditions of described transmitter side, determine that current need use described the first reference signal or the second reference signal, and receive current the first reference signal or the second reference signal that needs use.
Here, the state of described receiver side comprises the motion state of receiver side, for example, whether is in high-speed moving state etc.Determining the reference signal of use according to channel conditions, specifically can be the parameter of obtaining current sign current channel condition, determines the reference signal of using according to this parameter.
When the configuration reference signal, channel conditions that can pre-configured each reference signal was suitable for (such as the span of the parameter that is used for characterizing channel conditions) and/or receiver side state (as, high-speed moving state, stable state etc.) and/or receiver side type (such as the terminal of high-speed mobile, the terminal of stable state etc.).So, transmitter side can according to corresponding information, need determine the reference signal of use.In addition, can also before the described reference signal of transmission, specify the reference signal that to use at transmitter side or receiver side in advance.
Accordingly, the present invention also provides a kind of transmitted reference system, as shown in Figure 3, this system comprises: dispensing unit and transmission unit, wherein, dispensing unit is used for configuration and is used at least two kinds of demodulation of downlink institute the transmission of data with reference to signal: the first reference signal and the second reference signal; Transmission unit is used for transmitting described the first reference signal and/or the second reference signal when downlink transmission data.
Particularly, described transmission unit can comprise the sending module that is arranged on transmitter side and the receiver module that is arranged on receiver side, the sending module of transmitter side, be used for according to the state of the type of receiver side and/or receiver side and/or current channel conditions and/or the indication of receiver side, determine current use the first reference signal or the second reference signal, and in down link, send described the first reference signal or the second reference signal; The receiver module of receiver side is used for receiving the first reference signal or the second reference signal that the sending module of described transmitter side sends.
Wherein, the sending module of transmitter side can also be used for sending the first reference signal and the second reference signal at down link; The receiver module of receiver side, can also be used for indication and/or self type and/or oneself state and/or channel conditions according to described transmitter side, determine current described the first reference signal or the second reference signal need used, and current the first reference signal or the second reference signal used of needing of selective reception the first reference signal that sends from the sending module of described transmitter side and the second reference signal.
Above-mentioned transmitter side can comprise base station or relay station, above-mentioned receiver side can comprise terminal and/or with the RN of base station communication.Above-mentioned dispensing unit can be arranged on transmitter side and receiver side simultaneously, also transmitter side can only be set.
Each reference signal among the present invention is used for data demodulates, only transmits in the Resource Block that transfer of data is distributed.Described reference signal is supported the demodulation of multilayer multiplexing data, and when the data multilayer transmission, the port number of transmission of reference signals is identical with number of data layers, i.e. the reference signal of the corresponding port of every layer data.
Particularly, transmit described the second reference signal, also comprise: described the second reference signal of transmission in a subframe 6 or 8 the OFDM symbols; Wherein, the position of per two OFDM symbols is adjacent in described 8 OFDM symbols.
Transmit described the second reference signal, comprising: in a Resource Block, occupy described second reference signal of 2 subcarriers or 3 corresponding ports of sub-carrier transmission at frequency domain.Described 2 subcarriers are 2 subcarriers of 5 subcarriers of 2 subcarriers or intervals of 9 subcarriers in interval in Resource Block.And/or described 3 subcarriers are 3 subcarriers of 4 subcarriers in interval in resource.
Described at least two kinds with reference to signal, also comprise: the 3rd reference signal; Described method can also comprise: when downlink transmission data, transmit described the first reference signal and/or the second reference signal and/or the 3rd reference signal.
Particularly, can transmit described the 3rd reference signal in 2 OFDM symbols in a subframe.
In a Resource Block, can occupy at frequency domain described the 3rd reference signal of 2 or 3 the corresponding ports of sub-carrier transmission.
Accordingly, described dispensing unit also is used for configuration the 3rd reference signal; Described transmission unit also is used for transmitting described the first reference signal and/or the second reference signal and/or the 3rd reference signal when downlink transmission data.
Wherein, described the first reference signal has identical form with the UE dedicated demodulation reference signal of LTE Release-10 system.
Particularly, the transmission structure of the first reference signal as shown in Figure 4, the first reference signal is divided into two groups, as shown in Figure 4,
Represent first group of first reference signal,
Represent second group of first reference signal, adopt the mode of frequency division multiplex (FDM, Frequency Division Multiplexing) to keep quadrature between every group, namely two group of first reference signal is different at the subcarrier that frequency domain takies; In each group, adopt code division multiplex (CDM, Code Division Multiplexing) multiplexing a plurality of port transmission the first reference signals of mode, maximum can be multiplexing 4 layers in each group, concrete, shown in solid line ellipse among Fig. 4, use length is 2 quadrature mask (OCC, Orthogonal Cover Code) spread spectrum on two adjacent reference signal RE, can guarantee the first reference signal of multiplexing two ports in each group, shown in dotted ellipse among Fig. 4, to use length be 4 OCC on 4 reference signal RE on the internal reference signal subcarrier of Resource Block spread spectrum, the reference signal of maximum multiplexing 4 ports in each group can be guaranteed, maximum 8 layers transfer of data can be supported like this.
Embodiment one
The present embodiment is described the sending method of the second reference signal, and is concrete, and than the first reference signal, the second reference signal increases density in time domain, identical with the first reference signal on frequency domain density.
As shown in Figure 5, in the subframe of down link, this subframe has common CP length, described the second reference signal of transmission in the 6th, 7,10,11,13,14 OFDM symbol in a subframe, namely numbering is respectively described the second reference signal of transmission in 6 OFDM symbols of 5,6,9,10,12,13 among Fig. 5; As shown in Figure 5, in a Resource Block, take the second reference signal of 3 corresponding ports of sub-carrier transmission at frequency domain, 4 subcarriers in interval between adjacent two subcarriers in these 3 subcarriers.
As shown in Figure 5, the second reference signal can be supported 4 layers of transmission in the present embodiment.Particularly, the reference signal among Fig. 5 comprises two groups,
Represent first group of second reference signal,
Represent second group of second reference signal, two group of second reference signal is multiplexing by the mode of FDM, shown in solid line ellipse among Fig. 5, employing length is OCC spread spectrum on two adjacent reference signal RE of 2 in each group, so, one group of second reference signal transmission that can support 2 ports, two groups reference signal just can be supported 4 port transmission.
In subframe the 1st OFDM symbol (being numbered the OFDM symbol of symbol 0) also be used for the second reference signal during the transfer of data of responsible demodulation (for example business data transmission of special carrier), can adopt reference signal pattern shown in Figure 6 to transmit the second reference signal, wherein, in a subframe the 1st, 2,7,8,13, described the second reference signal of transmission in 14 OFDM symbols, be that numbering is respectively 0 among Fig. 6,1,6,7,12, described the second reference signal of transmission in 6 OFDM symbols of 13, in a Resource Block, take the second reference signal of 3 corresponding ports of sub-carrier transmission at frequency domain, 4 subcarriers in interval between adjacent two subcarriers in these 3 subcarriers, multiplex mode repeats no more as hereinbefore.
Embodiment two
The present embodiment is described the sending method of the second reference signal, and is concrete, and than the first reference signal, the second reference signal increases density in time domain, identical with the first reference signal on frequency domain density.
As shown in Figure 7, in the subframe of down link, this subframe has common CP length, described the second reference signal of transmission in the 3rd, 4,6,7,10,11,13 and 14 OFDM symbol in a subframe, namely numbering is respectively described the second reference signal of transmission in 8 OFDM symbols of 2,3,5,6,9,10,12,13 among Fig. 7; As shown in Figure 7, in a Resource Block, take the second reference signal of 3 corresponding ports of sub-carrier transmission at frequency domain, 4 subcarriers in interval between adjacent two subcarriers in these 3 subcarriers.
Reference signal among Fig. 7 comprises two groups,
Represent first group of second reference signal,
Represent second group of second reference signal, two groups of modes by FDM are multiplexing, shown in solid line ellipse among Fig. 7, employing length is OCC spread spectrum on two adjacent reference signal RE of 2 in every group, so, one group of second reference signal can be supported 2 port transmission, and two group of second reference signal just can be supported 4 port transmission.
If need to support the transfer of data greater than 4 layers, can adopt so length to be that 4 OCC carries out CDM multiplexing, concrete, shown in dotted ellipse among Fig. 7, adopting length in every group is spread spectrum on 4 four adjacent reference signal RE of OCC in a time slot, so, one group of second reference signal can be supported 4 port transmission, and two group of second reference signal can be supported 8 port transmission.
If before in the subframe several OFDM symbols also be used for the second reference signal the transmission of responsible demodulating data, can adopt the pattern among Fig. 8 to carry out the transmission of the second reference signal.Particularly, as shown in Figure 8, in the subframe of down link, this subframe has common CP length, described the second reference signal of transmission in the 1st, 2,5,6,9,10,13 and 14 OFDM symbol in a subframe, namely numbering is respectively described the second reference signal of transmission in 8 OFDM symbols of 0,1,4,5,8,9,12,13 among Fig. 8; As shown in Figure 8, in a Resource Block, take the second reference signal of 3 corresponding ports of sub-carrier transmission at frequency domain, 4 subcarriers in interval between adjacent two subcarriers in these 3 subcarriers, multiplex mode repeats no more as hereinbefore.
Embodiment three
The present embodiment is described the sending method of the second reference signal, particularly, and than the first reference signal, the second reference signal reduces density at frequency domain, identical with the first reference signal on time domain density, so, the second reference signal can be used in the data demodulates of channel coherence bandwidth when larger.
Concrete, as shown in Figure 9, in the subframe of down link, this subframe has common CP length, described the second reference signal of transmission in the 6th, 7,13 and 14 OFDM symbol in a subframe, namely numbering is respectively described the second reference signal of transmission in 4 OFDM symbols of 5,6,12,13 among Fig. 9; As shown in Figure 9, the second reference signal comprises two groups,
Represent first group of second reference signal,
Represent second group of second reference signal, in a Resource Block, take the second reference signal of 2 corresponding ports of sub-carrier transmission at frequency domain, 9 subcarriers in interval between these 2 subcarriers, particularly, first group of second reference signal takies the 2nd and 12 subcarrier, namely is numbered two subcarriers of 1 and 11 among Fig. 9, second group of second reference signal takies the 1st and 11 subcarrier, namely is numbered two subcarriers of 0 and 10 among Fig. 9.
As shown in Figure 9, two group of second reference signal maximum can be supported 8 layers of transmission, and the multiplex mode of the second reference signal of different port is identical with previous embodiment two, repeats no more.
Embodiment four
The present embodiment is described the sending method of the second reference signal, particularly, and than the first reference signal, the second reference signal reduces density at frequency domain, identical with the first reference signal on time domain density, so, the second reference signal can be used in the data demodulates of channel coherence bandwidth when larger.
Concrete, as shown in figure 10, in the subframe of down link, this subframe has common CP length, described the second reference signal of transmission in the 6th, 7,13 and 14 OFDM symbol in a subframe, namely numbering is respectively described the second reference signal of transmission in 4 OFDM symbols of 5,6,12,13 among Figure 10; As shown in figure 10, the second reference signal comprises two groups,
Represent first group of second reference signal,
Represent second group of second reference signal, in a Resource Block, take the second reference signal of 2 corresponding ports of sub-carrier transmission at frequency domain, 5 subcarriers in interval between these 2 subcarriers, particularly, first group of second reference signal takies the 4th and 10 subcarrier, namely is numbered two subcarriers of 3 and 9 among Figure 10, second group of second reference signal takies the 3rd and 9 subcarrier, namely is numbered two subcarriers of 2 and 8 among Figure 10.
As shown in figure 10, two group of second reference signal maximum can be supported 8 layers of transmission, and the multiplex mode of the second reference signal of different port is identical with previous embodiment two, repeats no more.
Further, the subcarrier in frequency domain position of described the second reference signal transmission can be fixing in Resource Block such as the position among Figure 10, perhaps be offset (shift) at frequency domain based on some specific parameters, namely the interval between the shared subcarrier of the second reference signal of an interior same port of Resource Block is identical, but concrete sub-carrier positions can be calculated based on some special parameters and obtain, for example, can determine based on the number of cell ID mould 6 rear acquisitions the sub-carrier positions of the second reference signal, if the number that obtains behind the mould 6 is 0, two group of second reference signal sub-carrier positions of shining upon just is numbered 0 and 1 in Resource Block so, also namely the 1st and the 2nd subcarrier begins mapping, at this moment, the transmission location of the second reference signal as shown in figure 11.Other situations the like.
In the practical application, the sub-carrier positions of the second reference signal transmission is fixedly the time, and transmission course is relatively simple, and the skew of the sub-carrier positions of the second reference signal transmission, then can effectively avoid the reference signal-to-interference of neighbor cell.
Embodiment five
The present embodiment is described the sending method of the 3rd reference signal, and than the first reference signal, described the 3rd reference signal is more sparse in the density of time domain, is used for the channel coherence time of the data demodulates when larger.Particularly, transmit the 3rd reference signal on inherent two the OFDM symbols of subframe.
As shown in figure 12, when the subframe of described down link had common CP length, described the 3rd reference signal of transmission in the 13rd and 14 the OFDM symbol in subframe namely was numbered transmission the 3rd reference signal on two OFDM symbols of 12 and 13 among Figure 12; In a Resource Block, occupy the 3rd reference signal of 3 corresponding ports of sub-carrier transmission at frequency domain, 4 subcarriers in interval between adjacent two subcarriers in these 3 subcarriers.As shown in figure 12, the 3rd reference signal comprises two groups,
Represent first group of the 3rd reference signal,
Represent second group of the 3rd reference signal, first group of the 3rd reference signal takies the 2nd, the 7th and the 12nd subcarrier, be to be numbered three subcarriers of 1,6,11 among Figure 12, second group of the 3rd reference signal takies the 1st, the 6th and the 11st subcarrier, namely is numbered three subcarriers of 0,5,10 among Figure 12.Owing to only having 2 reference signal RE at a reference signal subcarrier, therefore can only use length in one group is 2 OCC, namely can support the reference signal transmission of 2 ports in one group, two reference signal groups among Figure 12 can be supported the 3rd reference signal transmission of maximum 4 ports, i.e. multiplexing 4 layer data.
Also can consider further to dwindle at frequency domain the density of reference signal, to improve the channel coherence bandwidth than the transmission performance under the large scene.As shown in figure 13, when the subframe of described down link had common CP length, described the 3rd reference signal of transmission in the 13rd and 14 the OFDM symbol in subframe namely was numbered transmission the 3rd reference signal on two OFDM symbols of 12 and 13 among Figure 13; In a Resource Block, occupy the 3rd reference signal of 2 corresponding ports of sub-carrier transmission at frequency domain, 9 subcarriers in interval between adjacent two subcarriers in these 2 subcarriers.As shown in figure 13, the 3rd reference signal comprises two groups,
Represent first group of the 3rd reference signal,
Represent second group of the 3rd reference signal, first group of the 3rd reference signal takies the 2nd and the 12nd subcarrier, be to be numbered two subcarriers of 1,11 among Figure 13, second group of the 3rd reference signal takies the 1st and the 11st subcarrier, be to be numbered two subcarriers of 0,10 among Figure 13, multiplex mode during multiport is identical with Figure 12, repeats no more.
Perhaps, as shown in figure 14, when the subframe of described down link had common CP length, described the 3rd reference signal of transmission in the 13rd and 14 the OFDM symbol in subframe namely was numbered transmission the 3rd reference signal on two OFDM symbols of 12 and 13 among Figure 13; In a Resource Block, occupy the 3rd reference signal of 2 corresponding ports of sub-carrier transmission at frequency domain, 5 subcarriers in interval between adjacent two subcarriers in these 2 subcarriers.As shown in figure 14, the 3rd reference signal comprises two groups,
Represent first group of the 3rd reference signal,
Represent second group of the 3rd reference signal, first group of the 3rd reference signal takies the 4th and the 10th subcarrier, be to be numbered two subcarriers of 3,9 among Figure 13, second group of the 3rd reference signal takies the 3rd and the 9th subcarrier, be to be numbered two subcarriers of 2,8 among Figure 13, multiplex mode during multiport is identical with Figure 12, repeats no more.Equally, the subcarrier in frequency domain position of the 3rd reference signal mapping can be fixed, and also can be offset based on special parameter, and the related realization similar process among specific implementation process and the embodiment four repeats no more.
The above is preferred embodiment of the present invention only, is not for limiting protection scope of the present invention.
Claims (18)
1. the transmission method of a reference signal is characterized in that, described method comprises:
Configuration is used at least two kinds of demodulation of downlink institute the transmission of data with reference to signal: the first reference signal and the second reference signal;
When downlink transmission data, transmit described the first reference signal and/or the second reference signal.
2. the transmission method of described reference signal according to claim 1 is characterized in that,
Described the first reference signal of described transmission and/or the second reference signal, comprise: transmitter side is according to the state of the type of receiver side and/or receiver side and/or current channel conditions and/or the indication of receiver side, determine current use the first reference signal or the second reference signal, and in down link, sending described the first reference signal or the second reference signal to receiver side, receiver side receives described the first reference signal or the second reference signal.
3. the transmission method of described reference signal according to claim 1 is characterized in that,
Described the first reference signal of described transmission and/or the second reference signal, comprise: transmitter side sends the first reference signal and the second reference signal in down link, receiver side is according to indication and/or self type and/or oneself state and/or the channel conditions of described transmitter side, determine that current need use described the first reference signal or the second reference signal, and receive current the first reference signal or the second reference signal that needs use.
4. the transmission method of described reference signal according to claim 1 is characterized in that,
Described the first reference signal has identical form with the UE dedicated demodulation reference signal of LTE Release-10 system.
5. the transmission method of described reference signal according to claim 1 is characterized in that, transmits described the second reference signal, comprising:
Described the second reference signal of transmission in a subframe 6 or 8 the OFDM symbols.
6. according to claim 1 or the transmission method of 5 described reference signals, it is characterized in that, transmit described the second reference signal, comprising:
When the subframe of described down link has common CP length, described the second reference signal of transmission in the 6th, 7,10,11,13 and 14 the OFDM symbol in subframe; Perhaps, described the second reference signal of transmission in the 1st, 2,7,8,13 and 14 the OFDM symbol in subframe.
7. according to claim 1 or the transmission method of 5 described reference signals, it is characterized in that, transmit described the second reference signal, comprising:
When the subframe of described down link has common CP length, described the second reference signal of transmission in the 3rd, 4,6,7,10,11,13 and 14 the OFDM symbol in subframe; Perhaps, described the second reference signal of transmission in the 1st, 2,5,6,9,10,13 and 14 the OFDM symbol in the subframe.
8. according to claim 1 to the transmission method of 5 each described reference signals, it is characterized in that, transmit described the second reference signal, also comprise:
In a Resource Block, occupy described second reference signal of 2 subcarriers or 3 corresponding ports of sub-carrier transmission at frequency domain.
9. the transmission method of described reference signal according to claim 8 is characterized in that,
Described 2 subcarriers are 2 subcarriers of 5 subcarriers of 2 subcarriers or intervals of 9 subcarriers in interval in Resource Block;
And/or described 3 subcarriers are 3 subcarriers of 4 subcarriers in interval in resource.
10. the transmission method of described reference signal according to claim 9 is characterized in that,
Described 2 subcarriers are the 1st and the 11st subcarrier or the 2nd and the 12nd subcarrier or the 3rd and the 9th subcarrier or the 4th and the 10th subcarrier in the Resource Block.
11. the transmission method of described reference signal is characterized in that according to claim 1,
Described at least two kinds with reference to signal, also comprise: the 3rd reference signal;
Described method also comprises: when downlink transmission data, transmit described the first reference signal and/or the second reference signal and/or the 3rd reference signal.
12. the transmission method of described reference signal is characterized in that according to claim 11,
Described the 3rd reference signal of described transmission comprises: described the 3rd reference signal of transmission in 2 OFDM symbols in a subframe.
13. according to claim 11 or the transmission method of 12 described reference signals, it is characterized in that, described the 3rd reference signal of described transmission comprises:
When the subframe of described down link has common CP length, described the 3rd reference signal of transmission in the 13rd and 14 the OFDM symbol in subframe.
14. according to claim 11 or the transmission method of 12 described reference signals, it is characterized in that, transmit described the 3rd reference signal, also comprise:
In a Resource Block, occupy described the 3rd reference signal of 2 or 3 the corresponding ports of sub-carrier transmission at frequency domain.
15. the transmission system of a reference signal is characterized in that, described system comprises: dispensing unit and transmission unit, wherein,
Dispensing unit is used for configuration and is used at least two kinds of demodulation of downlink institute the transmission of data with reference to signal: the first reference signal and the second reference signal;
Transmission unit is used for transmitting described the first reference signal and/or the second reference signal when downlink transmission data.
16. the transmission system of described reference signal is characterized in that according to claim 15, described transmission unit comprises the sending module that is arranged on transmitter side and the receiver module that is arranged on receiver side; Wherein,
The sending module of transmitter side, be used for according to the state of the type of receiver side and/or receiver side and/or current channel conditions and/or the indication of receiver side, determine current use the first reference signal or the second reference signal, and in down link, send described the first reference signal or the second reference signal;
The receiver module of receiver side is used for receiving the first reference signal or the second reference signal that the sending module of described transmitter side sends.
17. the transmission system of described reference signal is characterized in that according to claim 16,
The sending module of transmitter side can also be used for sending the first reference signal and the second reference signal at down link; The receiver module of receiver side, can also be used for indication and/or self type and/or oneself state and/or channel conditions according to described transmitter side, determine current described the first reference signal or the second reference signal need used, and current the first reference signal or the second reference signal used of needing of selective reception the first reference signal that sends from the sending module of described transmitter side and the second reference signal.
18. to the transmission system of 17 each described reference signals, it is characterized in that according to claim 15,
Described dispensing unit also is used for configuration the 3rd reference signal;
Described transmission unit also is used for transmitting described the first reference signal and/or the second reference signal and/or the 3rd reference signal when downlink transmission data.
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