CN102378110B

CN102378110B - Methods for sending and receiving demodulated reference signal (DM-RS) and devices for sending and receiving DM-RS

Info

Publication number: CN102378110B
Application number: CN201010254905.3A
Authority: CN
Inventors: 史志华; 徐晓东; 王启星; 刘建军; 刘光毅
Original assignee: China Mobile Communications Group Co Ltd
Current assignee: China Mobile Communications Group Co Ltd
Priority date: 2010-08-16
Filing date: 2010-08-16
Publication date: 2014-09-24
Anticipated expiration: 2030-08-16
Also published as: CN102378110A

Abstract

The invention discloses methods for sending and receiving a demodulated reference signal (DM-RS) and devices for sending and receiving the DM-RS. The method for sending the DM-RS comprises the following steps of: from all physical resource blocks (PRB) which are included in a multimedia broadcast single frequency network (MBSFN) sub-frame to be sent to a user terminal, determining the PRB which is allocated to the user terminal; from resource elements (RE), which are included in the PRB, except the REs which carry a physical downlink control channel (PDCCH) and a common reference signal (CRS), determining the RE which carries the DM-RS; mapping the DM-RS into the determined RE; and sending the MBSFN sub-frame to the user terminal. The invention provides specific technical schemes that a base station sends the DM-RS in the MBSFN sub-frame and the user terminal receives the DM-RS in the MBSFN sub-frame.

Description

The sending method of demodulated reference signal and device, method of reseptance and device

Technical field

The present invention relates to mobile communication technology field, relate in particular to a kind of sending method and device, method of reseptance and device of demodulated reference signal.

Background technology

Reference signal (Reference Signal, RS) is to provide by base station a kind of known signal that sends to user terminal, carries out channel estimating or channel measurement for user terminal.At present, at 3G (Third Generation) Moblie partner plan (3GPP, 3rd Generation partnership project) in defined 4 kinds of RS: the 8th version (R8, Release 8) public reference signal (CRS, Common Reference Signal), DRS (Dedicated Reference Signal) (the DRS of R8, Dedicated Reference Signal), the 10th version (R10, Release 10) demodulated reference signal (DM-RS, Demodulated Reference Signal) and the channel state information reference signals (CSI-RS of R10, Channel State Information Reference Signal).

OFDM (OFDM, Orthogonal Frequency Division Multiplexing) in system, a Physical Resource Block (PRB, Physical Resource Block) on frequency domain, take 12 continuous subcarriers, in time domain, take 14 or 12 continuous OFDM symbols, wherein when adopting conventional (Normal) Cyclic Prefix (CP, Cylic Prefix) time, a PRB takies 14 continuous OFDM symbols, in the time adopting expansion (Extended) CP, a PRB takies 12 continuous OFDM symbols, in PRB, RS is with Resource Unit (RE, Resource Element) be unit, a RS takies several RE on PRB, one of them RE is a subcarrier on an OFDM symbol.

At present, base station sends the method for CRS, DRS and DM-RS and determines in common subframe, determined which RE taking in which common subframe sends above-mentioned RS, wherein Figure 1A is the PRB schematic diagram that sends CRS, DRS and DM-RS in the common subframe that adopts Normal CP, and Figure 1B is the PRB schematic diagram that sends CRS, DRS and DM-RS in the common subframe that adopts Extended CP.

But, how base station is at multimedia broadcasting single frequency network (MBSFN, Multimedia Broadcast Single Frequency Network) send DM-RS in subframe, in prior art, do not provide concrete technical scheme, how user terminal receives DM-RS in MBSFN subframe, does not also provide concrete technical scheme in prior art.

Summary of the invention

The embodiment of the present invention provides a kind of sending method and device, method of reseptance and device of demodulated reference signal, and the concrete technical scheme of DM-RS is provided in MBSFN subframe in order to provide base station to send DM-RS and user terminal in MBSFN subframe.

Accordingly, the embodiment of the present invention also provides a kind of base station and user terminal.

Embodiment of the present invention technical scheme is as follows:

A sending method for demodulated reference signal, the method comprising the steps of: in the each Physical Resource Block PRB comprising to the multimedia broadcasting single frequency network MBSFN subframe of user terminal to be sent, determine the PRB distributing into described user terminal; In RE that comprise at this PRB, except the Resource Unit RE of carrying physical downlink control channel PDCCH and public reference signal CRS, determine the RE of carrying demodulated reference signal DM-RS; DM-RS is mapped in the RE determining; Described MBSFN subframe is sent to described user terminal.

A dispensing device for demodulated reference signal, comprising: the first determining unit, at the each Physical Resource Block PRB that comprises to the multimedia broadcasting single frequency network MBSFN subframe of user terminal to be sent, determine the PRB distributing into described user terminal; The second determining unit, RE that comprise for the PRB determining in the first determining unit, except the Resource Unit RE of carrying physical downlink control channel PDCCH and public reference signal CRS, determines the RE that carries demodulated reference signal DM-RS; Map unit, for being mapped to DM-RS the RE that the second determining unit is determined; Transmitting element, for sending to described user terminal by the MBSFN subframe after map unit mapping.

A method of reseptance for demodulated reference signal, the method comprising the steps of: in each Physical Resource Block PRB that the multimedia broadcasting single frequency network MBSFN subframe that user terminal sends in base station comprises, determine the PRB distributing into described user terminal; In RE that comprise at this PRB, except the Resource Unit RE of carrying physical downlink control channel PDCCH and public reference signal CRS, determine the RE of carrying demodulated reference signal DM-RS; From the RE determining, receive DM-RS.

A receiving system for demodulated reference signal, comprising: the first determining unit, and the each Physical Resource Block PRB comprising for the multimedia broadcasting single frequency network MBSFN subframe sending in base station, determines the PRB distributing into user terminal; The second determining unit, RE that comprise for the PRB determining in the first determining unit, except the Resource Unit RE of carrying physical downlink control channel PDCCH and public reference signal CRS, determines the RE that carries demodulated reference signal DM-RS; Receiving element, receives DM-RS for the RE determining from the second determining unit.

In embodiment of the present invention technical scheme, base station is in the each PRB comprising to the MBSFN subframe of user terminal to be sent, determine the PRB distributing for this user terminal, then comprise at this PRB, in RE except the RE of carrying PDCCH and CRS, determine the RE of carrying DM-RS, DM-RS is mapped in the RE determining, again above-mentioned MBSFN subframe is sent to this user terminal, thereby realize the scheme that sends DM-RS in MBSFN subframe, due to the RE carrying DM-RS based on except the RE of carrying PDCCH and CRS, therefore just avoided PDCCH and CRS that DM-RS is produced and disturbed.

Brief description of the drawings

Figure 1A is in prior art, sends the PRB schematic diagram of CRS, DRS and DM-RS in the common subframe that adopts Normal CP;

Figure 1B is in prior art, sends the PRB schematic diagram of CRS, DRS and DM-RS in the common subframe that adopts Extended CP;

Fig. 2 is in the embodiment of the present invention, the sending method schematic flow sheet of DM-RS;

Fig. 3 A is in the embodiment of the present invention, for the MBSFN subframe that adopts Normal CP, sends the PRB schematic diagram of PDCCH and CRS;

Fig. 3 B is in the embodiment of the present invention, for the MBSFN subframe that adopts Extended CP, sends the PRB schematic diagram of PDCCH and CRS;

Fig. 4 is in the embodiment of the present invention, for the MBSFN subframe that adopts Extended CP, the DM-RS Pattern schematic diagram in the time that the quantity of DM-RS port is 2;

Fig. 5 is in the embodiment of the present invention, for the MBSFN subframe that adopts Extended CP, the DM-RS Pattern schematic diagram in the time that the quantity of DM-RS port is 4;

Fig. 6 is in the embodiment of the present invention, for the MBSFN subframe that adopts Extended CP, the DM-RS Pattern schematic diagram in the time that the quantity of DM-RS port is 8;

Fig. 7 A～Fig. 7 F is in the embodiment of the present invention, for the MBSFN subframe that adopts Extended CP, the DM-RS Pattern schematic diagram in the time that the quantity of DM-RS port is 2;

Fig. 8 A～Fig. 8 F is in the embodiment of the present invention, for the MBSFN subframe that adopts Extended CP, the DM-RS Pattern schematic diagram in the time that the quantity of DM-RS port is 4;

Fig. 9 A～Fig. 9 B is in the embodiment of the present invention, for the MBSFN subframe that adopts Extended CP, the DM-RS Pattern schematic diagram in the time that the quantity of DM-RS port is 8;

Figure 10 is in the embodiment of the present invention, the dispensing device structural representation of demodulated reference signal;

Figure 11 is in the embodiment of the present invention, the method for reseptance schematic flow sheet of DM-RS;

Figure 12 is in the embodiment of the present invention, the receiving system structural representation of demodulated reference signal.

Embodiment

Below in conjunction with each accompanying drawing, embodiment of the present invention technical scheme main realized to principle, embodiment and the beneficial effect that should be able to reach is at length set forth.

In order to support multiple-input and multiple-output (MIMO, Multiple-Input-Multiple-Output) transmission, when base station sends DM-RS to user terminal, can send DM-RS based on 2 DM-RS ports, the data flow of now transmitting between base station and user terminal is 2 data flow, also can send DM-RS based on 4 DM-RS ports, the data flow of now transmitting between base station and user terminal is 4 data flow, can also send DM-RS based on 8 DM-RS ports, the data flow of now transmitting between base station and user terminal is 8 data flow.

In the embodiment of the present invention, the expense of the RE of 2 DM-RS ports, 4 DM-RS ports and 8 DM-RS port transmission DM-RS is made as: lRE and port and PRB, that is to say on each PRB, each DM-RS port only takies 1 RE and sends DM-RS.

As shown in Figure 2, be the sending method flow chart of DM-RS in the embodiment of the present invention, its concrete processing procedure is as follows:

Step 21, in the each PRB comprising to the MBSFN subframe of user terminal to be sent, determines the PRB distributing into this user terminal;

If base station need to send DM-RS to user terminal in MBSFN subframe, first base station will, in MBSFN subframe to be sent, be defined as the PRB that this user terminal distributes, and then in the PRB determining, determines the RE that sends DM-RS.

Step 22, in the RE outside the RE comprising, remove carrying Physical Downlink Control Channel (PDCCH, Physical Downlink Control Channel) and CRS, determines the RE of carrying DM-RS at this PRB;

In the PRB of MBSFN subframe, the first two OFDM symbol is used for transmitting PDCCH and CRS, for fear of PDCCH and CRS, DM-RS is produced and disturbed, the PRB that the embodiment of the present invention proposes to determine in step 21 comprises, in RE except the RE of carrying PDCCH and CRS, determine the RE of carrying DM-RS, Fig. 3 A is the PRB schematic diagram that sends PDCCH and CRS in the MBSFN subframe that adopts Normal CP, Fig. 3 B is the PRB schematic diagram that sends PDCCH and CRS in the MBSFN subframe that adopts Extended CP, send the first two OFDM symbol in the PRB that PDCCH and CRS taken MBSFN subframe, for the MBSFN subframe that adopts Normal CP, rear 12 OFDM symbols of PRB can be used for carrying DM-RS, for the MBSFN subframe that adopts Extended CP, rear 10 OFDM symbols of PRB can be used for carrying DM-RS.

Step 23, is mapped to DM-RS in the RE determining;

Step 24, sends to described user terminal by described MBSFN subframe.

In the embodiment of the present invention, white space that can be in Fig. 3 A and Fig. 3 B, the RE that chooses arbitrarily defined amount carries DM-RS, in addition, in order to ensure the interpolation performance of channel estimator, the embodiment of the present invention proposes to choose RE at the edge of the time domain of PRB and frequency domain.

Introduce in detail the RE of how to confirm carrying DM-RS below.

There are multiple DM-RS ports base station for sending DM-RS, in advance DM-RS port is divided into at least one DM-RS port set, if the quantity of DM-RS port is 2, all DM-RS ports are divided into a DM-RS port set, if the quantity of DM-RS port is 4 or 8, all DM-RS ports are on average divided into a DM-RS port set and the 2nd DM-RS port set, in the time that the quantity of DM-RS port is 4, the quantity of the DM-RS port in the one DM-RS port set and the 2nd DM-RS port set is 2, in the time that the quantity of DM-RS port is 8, the quantity of the DM-RS port in the one DM-RS port set and the 2nd DM-RS port set is 4.

For each DM-RS port, this PRB sending at this DM-RS port comprises, in RE except the RE of carrying PDCCH and CRS, determine the RE of carrying DM-RS, wherein, the RE determining for the each DM-RS port in same DM-RS port set is identical, the RE difference of determining for the DM-RS port in different DM-RS port set, that is to say that the each DM-RS port in same DM-RS port set takies identical RE transmission DM-RS, and each DM-RS port in different DM-RS port set takies different RE and sends DM-RS, therefore the DM-RS that the each DM-RS port in different DM-RS port set sends adopts frequency division multiplexing (FDM, Frequency-Division Multiplexing) mode distinguish.

For with common subframe in DM-RS pattern (Pattern) be consistent, the embodiment of the present invention is established each DM-RS port in the time sending DM-RS, for the MBSFN subframe that adopts Normal CP, take 12 RE on a PRB, take four OFDM symbols, for the MBSFN subframe that adopts Extended CP, take 16 RE on a PRB, take four OFDM symbols.

The concrete mode of determining the RE of carrying DM-RS for each DM-RS port can be, but not limited to as follows:

For each DM-RS port, first this PRB sending at this DM-RS port comprises, in OFDM except the OFDM symbol of carrying PDCCH and CRS, select four OFDM symbols, preferably, can realize by following manner, this PRB that this DM-RS port is sent comprises, OFDM symbol combination except the OFDM symbol of carrying PDCCH and CRS is several OFDM symbols, each OFDM symbols comprises two OFDM symbols, two OFDM symbols that wherein comprise can be adjacent also can be non-conterminous, in the OFDM symbols being combined into, select two OFDM symbols, then in the RE comprising at four OFDM symbols selecting, RE in every two same sub-carrier is combined as to a RE couple, the RE centering being combined into, select several RE couple, by each RE of several RE centerings of selecting, be defined as carrying the RE of DM-RS, wherein, if it is adjacent that each OFDM symbols comprises two OFDM symbols, the adjacent RE of OFDM symbol in every two same sub-carrier can be combined as to a RE couple.

For example, two OFDM symbols selecting are according to the 3rd the OFDM symbol and the 4th OFDM symbols and the 13rd OFDM symbol and the 14th the OFDM symbols that OFDM symbol forms that OFDM symbol forms that are arranged in order by time order and function order, in 4 OFDM symbols selecting, two adjacent OFDM symbol in same sub-carrier RE are combined as to a RE couple.

In order to distinguish the DM-RS of the each DM-RS port transmission in same DM-RS port set, the embodiment of the present invention proposes to adopt code division multiplexing (CDM, Code-Division Multiplexing) mode distinguish, several RE centerings of above-mentioned selection, by at least one RE to being divided into a RE group, wherein, if the quantity of DM-RS port is 2 or 4, by a RE to being divided into a RE group, if the quantity of DM-RS port is 8, by two RE in same sub-carrier to being divided into a RE group, for example, the quantity of the DM-RS port that DM-RS port set comprises is 2, by the each RE selecting to being divided into a RE group, in each RE group, comprise 2 RE, that is to say that each DM-RS port set need to take several RE in the time sending DM-RS, for the each DM-RS port in each DM-RS port set distributes respectively an orthogonal intersection (OCC, Orthogonal Cover Code), the quantity of the DM-RS port that the length of the OCC wherein distributing comprises with this DM-RS port set is consistent, for example, the quantity of the DM-RS port that DM-RS port set comprises is 2, the length that is the OCC of the each DM-RS port assignment in this DM-RS port set is 2, for the each DM-RS port in each DM-RS port set, respectively according to the OCC distributing, the DM-RS that each RE in each RE group is carried sends to user terminal.

For example, DM-RS port 0 and a DM-RS port set of DM-RS port one composition, wherein DM-RS port 0 and DM-RS port one take identical RE and send DM-RS, the OCC distributing for DM-RS port 0 is (1,-1), the OCC distributing for DM-RS port one is (1, 1), the RE selecting is to being 6, each RE is to a corresponding RE group, DM-RS port 0 is according to (1,-1), the DM-RS that each RE in each RE group is carried sends to user terminal, DM-RS port one is according to (1, 1), the DM-RS that each RE in each RE group is carried sends to user terminal.

Be introduced for the DM-RS Pattern in the MBSFN subframe of the DM-RS Pattern in the MBSFN subframe of employing Normal CP and employing Extended CP respectively below.

MBSFN subframe for adopting Normal CP:

Because the first two OFDM symbol is used for passing PDCCH and CRS, therefore four OFDM symbols that transmit DM-RS need to be selected from the 3rd～the 14th the OFDM symbol being arranged in order by the order arriving first according to the time, consider the interpolation effect of channel estimating, the OFDM symbol of selecting should be as much as possible near the time domain border of PDCCH data area, therefore preferably, select the 3rd, the 4th, the 13rd and the 14th OFDM symbol, wherein in advance by the 3rd OFDM symbol and the 4th the synthetic OFDM symbols of OFDM symbols, by the 5th OFDM symbol and the 6th the synthetic OFDM symbols of OFDM symbols, by the 7th OFDM symbol and the 8th the synthetic OFDM symbols of OFDM symbols, by the 9th OFDM symbol and the 10th the synthetic OFDM symbols of OFDM symbols, by the 11st OFDM symbol and the 12nd the synthetic OFDM symbols of OFDM symbols, by the 13rd OFDM symbol and the 14th the synthetic OFDM symbols of OFDM symbols, select the OFDM symbols that formed by the 3rd OFDM symbol and the 4th OFDM symbol and by the 13rd OFDM symbol and the 14th the OFDM symbols that OFDM symbol forms.

In 4 OFDM symbols selecting, two adjacent OFDM symbol in same sub-carrier RE are combined as to a RE couple.

In the time that the quantity of DM-RS port is 2 (being respectively DM-RS port 0 and DM-RS port one), now RE group by a RE to forming, RE centering in combination is selected 6 RE couple, for the RE that each DM-RS port is taken is uniformly distributed, DM-RS Pattern now can be, but not limited to as shown in Figure 4, by the subcarrier in PRB according to being arranged in order to the order of high frequency by low frequency, the 3rd of comprising of this PRB that each DM-RS port is sent, the 4th, on the 13rd and the 14th OFDM symbol the 2nd, the 7th and the 12nd subcarrier, be defined as carrying the RE of DM-RS.

When being 4, the quantity of DM-RS port (is respectively DM-RS port 0, DM-RS port one, DM-RS port 2 and DM-RS port 3, wherein DM-RS port 0 and DM-RS port one composition the one DM-RS port set, DM-RS port 2 and DM-RS port 3 form the 2nd DM-RS port set) time, now RE group by a RE to forming, RE centering in combination is selected 12 RE couple, for the RE that each DM-RS port is taken is uniformly distributed, DM-RS Pattern now can be, but not limited to as shown in Figure 5, by the subcarrier in PRB according to being arranged in order to the order of high frequency by low frequency, for the each DM-RS port in a DM-RS port set, by the 3rd, the 4th, on the 13rd and the 14th OFDM symbol the 2nd, the 7th and the 12nd subcarrier, be defined as carrying the RE of DM-RS, for the each DM-RS port in the 2nd DM-RS port set, by the 3rd, the 4th, on the 13rd and the 14th OFDM symbol the 1st, the 6th and the 11st subcarrier, be defined as carrying the RE of DM-RS.

When being 8, the quantity of DM-RS port (is respectively DM-RS port 0～7, wherein DM-RS port 0～3 composition the one DM-RS port set, DM-RS port 4～7 composition the 2nd DM-RS port set) time, now RE group by 2 RE to forming, RE centering in combination is selected 12 RE couple, for the RE that each DM-RS port is taken is uniformly distributed, DM-RS Pattern now can be, but not limited to as shown in Figure 6, by the subcarrier in PRB according to being arranged in order to the order of high frequency by low frequency, for the each DM-RS port in a DM-RS port set, by the 3rd, the 4th, on the 13rd and the 14th OFDM symbol the 2nd, the 7th and the 12nd subcarrier, be defined as carrying the RE of DM-RS, for the each DM-RS port in the 2nd DM-RS port set, by the 3rd, the 4th, on the 13rd and the 14th OFDM symbol the 1st, the 6th and the 11st subcarrier, be defined as carrying the RE of DM-RS.

MBSFN subframe for adopting Extended CP:

Because the first two OFDM symbol is used for passing PDCCH and CRS, therefore four OFDM symbols that transmit DM-RS need to be selected from the 3rd～the 12nd the OFDM symbol being arranged in order by the order arriving first according to the time, consider the interpolation effect of channel estimating, the OFDM symbol of selecting should be as much as possible near the time domain border of PDCCH data area, therefore preferably, select the 3rd, the 4th, the 11st and the 12nd OFDM symbol, wherein in advance by the 3rd OFDM symbol and the 4th the synthetic OFDM symbols of OFDM symbols, by the 5th OFDM symbol and the 6th the synthetic OFDM symbols of OFDM symbols, by the 7th OFDM symbol and the 8th the synthetic OFDM symbols of OFDM symbols, by the 9th OFDM symbol and the 10th the synthetic OFDM symbols of OFDM symbols, by the 11st OFDM symbol and the 12nd the synthetic OFDM symbols of OFDM symbols, select the OFDM symbols that formed by the 3rd OFDM symbol and the 4th OFDM symbol and by the 11st OFDM symbol and the 12nd the OFDM symbols that OFDM symbol forms.

In the time that the quantity of DM-RS port is 2 (being respectively DM-RS port 0 and DM-RS port one), now RE group by a RE to forming, RE centering in combination is selected 8 RE couple, for the RE that each DM-RS port is taken is uniformly distributed, DM-RS Pattern now can be, but not limited to as shown in Fig. 7 A～7F, by the subcarrier in PRB according to being arranged in order to the order of high frequency by low frequency.

In Fig. 7 A, by the 2nd, the 5th, the 8th and the 11st subcarrier on the 3rd and the 4th OFDM symbol, and the 3rd, the 6th, the 9th and the 12nd subcarrier on the 11st and the 12nd OFDM symbol, be defined as carrying the RE of DM-RS;

In Fig. 7 B, by the 3rd, the 6th, the 9th and the 12nd subcarrier on the 3rd and the 4th OFDM symbol, and the 2nd, the 5th, the 8th and the 11st subcarrier on the 11st and the 12nd OFDM symbol, be defined as carrying the RE of DM-RS;

In Fig. 7 C, by the 1st, the 4th, the 7th and the 10th subcarrier on the 3rd and the 4th OFDM symbol, and the 3rd, the 6th, the 9th and the 12nd subcarrier on the 11st and the 12nd OFDM symbol, be defined as carrying the RE of DM-RS;

In Fig. 7 D, by the 3rd, the 6th, the 9th and the 12nd subcarrier on the 3rd and the 4th OFDM symbol, and the 1st, the 4th, the 7th and the 10th subcarrier on the 11st and the 12nd OFDM symbol, be defined as carrying the RE of DM-RS;

In Fig. 7 E, by the 2nd, the 5th, the 8th and the 11st subcarrier on the 3rd and the 4th OFDM symbol, and the 1st, the 4th, the 7th and the 10th subcarrier on the 11st and the 12nd OFDM symbol, be defined as carrying the RE of DM-RS;

In Fig. 7 F, by the 1st, the 4th, the 7th and the 10th subcarrier on the 3rd and the 4th OFDM symbol, and the 2nd, the 5th, the 8th and the 11st subcarrier on the 11st and the 12nd OFDM symbol, be defined as carrying the RE of DM-RS.

When being 4, the quantity of DM-RS port (is respectively DM-RS port 0, DM-RS end 1, DM-RS port 2 and DM-RS port 3, wherein DM-RS port 0 and DM-RS port one composition the one DM-RS port set, DM-RS port 2 and DM-RS port 3 form the 2nd DM-RS port set) time, now RE group by a RE to forming, RE centering in combination is selected 16 RE couple, for the RE that each DM-RS port is taken is uniformly distributed, DM-RS Pattern now can be, but not limited to as shown in Fig. 8 A～8F, by the subcarrier in PRB according to being arranged in order to the order of high frequency by low frequency.

In Fig. 8 A, for the each DM-RS port in a DM-RS port set, by the 2nd on the 3rd and the 4th OFDM symbol, the 5th, the 8th and the 11st subcarrier, and on the 11st and the 12nd OFDM symbol the 3rd, the 6th, the 9th and the 12nd subcarrier, be defined as carrying the RE of DM-RS, for the each DM-RS port in the 2nd DM-RS port set, by the 1st on the 3rd and the 4th OFDM symbol, the 4th, the 7th and the 10th subcarrier, and on the 11st and the 12nd OFDM symbol the 2nd, the 5th, the 8th and the 11st subcarrier, be defined as carrying the RE of DM-RS,

In Fig. 8 B, for the each DM-RS port in a DM-RS port set, by the 3rd on the 3rd and the 4th OFDM symbol, the 6th, the 9th and the 12nd subcarrier, and on the 11st and the 12nd OFDM symbol the 2nd, the 5th, the 8th and the 11st subcarrier, be defined as carrying the RE of DM-RS, for the each DM-RS port in the 2nd DM-RS port set, by the 2nd on the 3rd and the 4th OFDM symbol, the 5th, the 8th and the 11st subcarrier, and on the 11st and the 12nd OFDM symbol the 1st, the 4th, the 7th and the 10th subcarrier, be defined as carrying the RE of DM-RS,

In Fig. 8 C, for the each DM-RS port in a DM-RS port set, by the 1st, the 4th, the 7th and the 10th subcarrier on the 3rd and the 4th OFDM symbol, and the 3rd, the 6th, the 9th and the 12nd subcarrier on the 11st and the 12nd OFDM symbol, be defined as carrying the RE of DM-RS, for the each DM-RS port in the 2nd DM-RS port set, by the 2nd, the 5th, the 8th and the 11st subcarrier on the 3rd, the 4th, the 11st and the 12nd OFDM symbol, be defined as carrying the RE of DM-RS;

In Fig. 8 D, for the each DM-RS port in a DM-RS port set, by the 3rd, the 6th, the 9th and the 12nd subcarrier on the 3rd and the 4th OFDM symbol, and the 1st, the 4th, the 7th and the 10th subcarrier on the 11st and the 12nd OFDM symbol, be defined as carrying the RE of DM-RS, for the each DM-RS port in the 2nd DM-RS port set, by the 2nd, the 5th, the 8th and the 11st subcarrier on the 3rd, the 4th, the 11st and the 12nd OFDM symbol, be defined as carrying the RE of DM-RS;

In Fig. 8 E, for the each DM-RS port in a DM-RS port set, by the 2nd on the 3rd and the 4th OFDM symbol, the 5th, the 8th and the 11st subcarrier, and on the 11st and the 12nd OFDM symbol the 3rd, the 6th, the 9th and the 12nd subcarrier, be defined as carrying the RE of DM-RS, for the each DM-RS port in the 2nd DM-RS port set, by the 3rd on the 3rd and the 4th OFDM symbol, the 6th, the 9th and the 12nd subcarrier, and on the 11st and the 12nd OFDM symbol the 2nd, the 5th, the 8th and the 11st subcarrier, be defined as carrying the RE of DM-RS,

In Fig. 8 F, for the each DM-RS port in a DM-RS port set, by the 2nd, the 5th, the 8th and the 11st subcarrier on the 3rd, the 4th, the 11st and the 12nd OFDM symbol, be defined as carrying the RE of DM-RS, for the each DM-RS port in the 2nd DM-RS port set, by the 3rd, the 6th, the 9th and the 12nd subcarrier on the 3rd, the 4th, the 11st and the 12nd OFDM symbol, be defined as carrying the RE of DM-RS.

When being 8, the quantity of DM-RS port (is respectively DM-RS port 0～7, wherein DM-RS port 0～3 composition the one DM-RS port set, DM-RS port 4～7 composition the 2nd DM-RS port set) time, now RE group by two RE to forming, RE centering in combination is selected 16 RE couple, two RE that each RE group comprises are to being positioned on same subcarrier, for the RE that each DM-RS port is taken is uniformly distributed, DM-RS Pattern now can be, but not limited to as shown in Fig. 9 A～Fig. 9 B.

In Fig. 9 A, for the each DM-RS port in a DM-RS port set, by the 2nd, the 5th, the 8th and the 11st subcarrier on the 3rd, the 4th, the 11st and the 12nd OFDM symbol, be defined as carrying the RE of DM-RS, for the each DM-RS port in the 2nd DM-RS port set, by the 3rd, the 6th, the 9th and the 12nd subcarrier on the 3rd, the 4th, the 11st and the 12nd OFDM symbol, be defined as carrying the RE of DM-RS;

In Fig. 9 B, for the each DM-RS port in a DM-RS port set, by the 1st, the 4th, the 7th and the 10th subcarrier on the 3rd, the 4th, the 11st and the 12nd OFDM symbol, be defined as carrying the RE of DM-RS, for the each DM-RS port in the 2nd DM-RS port set, by the 2nd, the 5th, the 8th and the 11st subcarrier on the 3rd, the 4th, the 11st and the 12nd OFDM symbol, be defined as carrying the RE of DM-RS.

In above-mentioned Fig. 4～Fig. 9 B, the DM-RS port in each DM-RS port set can exchange, and each DM-RS port can carry out combination in any.In addition; the DM-RS Pattern that DM-RSPattern shown in Fig. 4～Fig. 9 B obtains after overall offset is done in PRB inside is also within protection range of the present invention, and each RE to being offset separately the DM-RS Pattern obtaining also within protection range of the present invention in frequency domain or time domain.

From above-mentioned processing procedure, in embodiment of the present invention technical scheme, base station is in the each PRB comprising to the MBSFN subframe of user terminal to be sent, determine the PRB distributing for this user terminal, then comprise at this PRB, in RE except the RE of carrying PDCCH and CRS, determine the RE of carrying DM-RS, DM-RS is mapped in the RE determining, again above-mentioned MBSFN subframe is sent to this user terminal, thereby realize the scheme that sends DM-RS in MBSFN subframe, due to the RE carrying DM-RS based on except the RE of carrying PDCCH and CRS, therefore just avoided PDCCH and CRS that DM-RS is produced and disturbed.

Accordingly, the embodiment of the present invention provides a kind of dispensing device of demodulated reference signal, and its structure as shown in figure 10, comprises the first determining unit 101, the second determining unit 102, map unit 103 and transmitting element 104, wherein:

The first determining unit 101, at the each PRB that comprises to the MBSFN subframe of user terminal to be sent, determines the PRB distributing into described user terminal;

The second determining unit 102, RE that comprise for the PRB determining in the first determining unit 101, except the RE of carrying PDCCH and CRS, determines the RE that carries DM-RS;

Map unit 103, the RE determining for DM-RS being mapped to the second determining unit 102;

Transmitting element 104, sends to described user terminal for the MBSFN subframe after map unit 103 is shone upon.

Preferably, the second determining unit 102 specifically comprises the first division subelement and definite subelement, wherein:

First divides subelement, for the DM-RS port that sends DM-RS is divided into at least one DM-RS port set, if the quantity of DM-RS port is 2, all DM-RS ports are divided into a DM-RS port set, if the quantity of DM-RS port is 4 or 8, all DM-RS ports are on average divided into a DM-RS port set and the 2nd DM-RS port set;

Determine subelement, be used for for each DM-RS port, in RE that this PRB sending at this DM-RS port comprises, except the RE of carrying PDCCH and CRS, determine the RE of carrying DM-RS, wherein, the RE determining for the each DM-RS port in same DM-RS port set is identical, the RE difference of determining for the DM-RS port in different DM-RS port set.

More preferably, determine that subelement specifically comprises the first selection module, composite module, the second selection module and determination module, wherein:

First selects module, for for each DM-RS port, in OFDM symbol that this PRB sending at this DM-RS port comprises, except the OFDM symbol of carrying PDCCH and CRS, selects four OFDM symbols;

Composite module, for for each DM-RS port, in the RE that four OFDM symbols selecting comprise, is combined as a RE couple by the RE in every two same sub-carrier in the first selection module;

Second selects module, and for for each DM-RS port, the RE centering being combined at composite module, selects several RE couple;

Determination module, for for each DM-RS port, each RE of several RE centerings that the second selection module is selected, is defined as carrying the RE of DM-RS.

More preferably, transmitting element 104 specifically comprises the second division subelement, distributes subelement and transmission subelement, wherein:

Second divides subelement, for several RE centerings of selecting in the second selection module, by at least one RE to being divided into a RE group, wherein, if the quantity of DM-RS port is 2 or 4, by a RE to being divided into a RE group, if the quantity of DM-RS port is 8, by two RE in same sub-carrier to being divided into a RE group;

Distribute subelement, be used to the each DM-RS port in each DM-RS port set to distribute respectively an OCC, the quantity of the DM-RS port that the length of the OCC wherein distributing comprises with this DM-RS port set is consistent;

Send subelement, for the each DM-RS port for each DM-RS port set, according to the OCC that distributes subelement to distribute, the DM-RS that the each RE in each RE group is carried sends to user terminal respectively.

Preferably, described base station MBSFN subframe of giving user terminal to be sent adopts Normal CP;

First four OFDM symbols selecting module to select for each DM-RS port are:

The 3rd, the 4th, the 13rd and the 14th OFDM symbol being arranged in order by the order after arriving first according to the time.

Preferably, described base station MBSFN subframe of giving user terminal to be sent adopts Extended CP;

First four OFDM symbols selecting module to select for each DM-RS port are:

The 3rd, the 4th, the 11st and the 12nd OFDM symbol being arranged in order by the order after arriving first according to the time.

The embodiment of the present invention also provides a kind of base station, comprises the dispensing device of above-mentioned demodulated reference signal, and wherein the dispensing device of demodulated reference signal can be, but not limited to be placed in base station.

Corresponding with the method for reseptance of above-mentioned DM-RS, the embodiment of the present invention also proposes the method for reseptance of a kind of DM-RS, and as shown in figure 11, its concrete processing procedure is as follows:

Step 111, in each PRB that the MBSFN subframe that user terminal sends in base station comprises, determines the PRB distributing into described user terminal;

Step 112, in RE that comprise at this PRB, except the RE of carrying PDCCH and CRS, determines the RE of carrying DM-RS;

Wherein, in RE that comprise at this PRB, except the RE of carrying PDCCH and CRS, determine the RE of carrying DM-RS, can be, but not limited to as following manner:

The DM-RS port that sends DM-RS is divided into at least one DM-RS port set, if the quantity of DM-RS port is 2, all DM-RS ports are divided into a DM-RS port set, if the quantity of DM-RS port is 4 or 8, all DM-RS ports are on average divided into a DM-RS port set and the 2nd DM-RS port set, for each DM-RS port, this PRB sending at this DM-RS port comprises, in RE except the RE of carrying PDCCH and CRS, determine the RE of carrying DM-RS, wherein, the RE determining for the each DM-RS port in same DM-RS port set is identical, the RE difference of determining for the DM-RS port in different DM-RS port set.

For each DM-RS port, in RE that this PRB sending at this DM-RS port comprises, except the RE of carrying PDCCH and CRS, determine the RE of carrying DM-RS, can be, but not limited to as following manner:

For each DM-RS port, in OFDM symbol that this PRB sending at this DM-RS port comprises, except the OFDM symbol of carrying PDCCH and CRS, select four OFDM symbols, in the RE comprising at four OFDM symbols selecting, RE in every two same sub-carrier is combined as to a RE couple, the RE centering being combined into, select several RE couple, by each RE of several RE centerings of selecting, be defined as carrying the RE of DM-RS.

Step 113 receives DM-RS from the RE determining.

From the RE determining, receive DM-RS, can be, but not limited to as following manner:

Several RE centerings of selecting, by at least one RE to being divided into a RE group, wherein, if the quantity of DM-RS port is 2 or 4, by a RE to being divided into a RE group, if the quantity of DM-RS port is 8, by two RE in same sub-carrier to being divided into a RE group, be defined as the OCC that the each DM-RS port in each DM-RS port set distributes respectively, the quantity of the DM-RS port that the length of the OCC wherein distributing comprises with this DM-RS port set is consistent, for the each DM-RS port in each DM-RS port set, respectively according to the OCC determining, from each RE group, receive DM-RS.

Wherein, if the MBSFN subframe that base station sends adopts regular circulation prefix Normal CP, four OFDM symbols selecting for each DM-RS port can be, but not limited to as the 3rd, the 4th, the 13rd and the 14th OFDM symbol being arranged in order by the order after arriving first according to the time.

If the MBSFN subframe that base station sends adopts extended cyclic prefix Extended CP, four OFDM symbols selecting for each DM-RS port can be, but not limited to as the 3rd, the 4th, the 11st and the 12nd OFDM symbol being arranged in order by the order after arriving first according to the time.

In fact, the sending method of any one DM-RS providing for the embodiment of the present invention, any one DM-RS Pattern that for example Fig. 4 to Fig. 8 F provides, user terminal can be on corresponding RE, be on corresponding OFDM symbol and subcarrier, receive the DM-RS that base station sends, repeat no more here.

Accordingly, the embodiment of the present invention provides a kind of receiving system of demodulated reference signal, and its structure as shown in figure 12, comprises the first determining unit 121, the second determining unit 122 and receiving element 123, wherein:

The first determining unit 121, the each PRB comprising for the MBSFN subframe sending in base station, determines the PRB distributing into user terminal;

The second determining unit 122, RE that comprise for the PRB determining in the first determining unit 121, except the RE of carrying PDCCH and CRS, determines the RE that carries DM-RS;

Receiving element 123, receives DM-RS for the RE determining from the second determining unit 122.

Preferably, the second determining unit 122 specifically comprises the first division subelement and first definite subelement, wherein:

First determines subelement, be used for for each DM-RS port, in RE that this PRB sending at this DM-RS port comprises, except the RE of carrying PDCCH and CRS, determine the RE of carrying DM-RS, wherein, the RE determining for the each DM-RS port in same DM-RS port set is identical, the RE difference of determining for the DM-RS port in different DM-RS port set;

More preferably, first determines that subelement specifically comprises the first selection module, composite module, the second selection module and determination module, wherein:

Second selects module, for for each DM-RS port, the RE centering being combined into, selects several RE couple;

Determination module, for each RE of several RE centerings that the second selection module is selected, is defined as carrying the RE of DM-RS.

More preferably, receiving element 123 specifically comprises the second division subelement, second definite subelement and reception subelement, wherein:

Second determines subelement, the OCC distributing respectively for being defined as each DM-RS port of each DM-RS port set, and the quantity of the DM-RS port that the length of the OCC wherein distributing comprises with this DM-RS port set is consistent;

Receive subelement, for the each DM-RS port for each DM-RS port set, according to the OCC determining, from each RE group, receive DM-RS respectively.

Preferably, base station sends to the MBSFN subframe of user terminal to adopt Normal CP;

First four OFDM symbols selecting module to select for each DM-RS port can be, but not limited to into:

Preferably, base station sends to the MBSFN subframe of user terminal to adopt Extended CP;

The embodiment of the present invention also provides a kind of user terminal, comprises the receiving system of above-mentioned demodulated reference signal, and wherein the receiving system of demodulated reference signal can be, but not limited to be placed in user terminal.

Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if these amendments of the present invention and within modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.

Claims

1. a sending method for demodulated reference signal, is characterized in that, comprising:

In the each Physical Resource Block PRB comprising to the multimedia broadcasting single frequency network MBSFN subframe of user terminal to be sent, determine the PRB distributing into described user terminal;

In RE that comprise at this PRB, except the Resource Unit RE of carrying physical downlink control channel PDCCH and public reference signal CRS, determine the RE of carrying demodulated reference signal DM-RS;

DM-RS is mapped in the RE determining;

Described MBSFN subframe is sent to described user terminal;

In RE that comprise at this PRB, except the RE of carrying PDCCH and CRS, determine the RE of carrying DM-RS, specifically comprise:

The DM-RS port that sends DM-RS is divided into at least one DM-RS port set, if the quantity of DM-RS port is 2, all DM-RS ports are divided into a DM-RS port set, if the quantity of DM-RS port is 4 or 8, all DM-RS ports are on average divided into a DM-RS port set and the 2nd DM-RS port set;

For each DM-RS port, in RE that this PRB sending at this DM-RS port comprises, except the RE of carrying PDCCH and CRS, determine the RE of carrying DM-RS, wherein, the RE determining for the each DM-RS port in same DM-RS port set is identical, the RE difference of determining for the DM-RS port in different DM-RS port set.

2. the sending method of demodulated reference signal as claimed in claim 1, is characterized in that, for each DM-RS port, determines the RE of carrying DM-RS, specifically comprises:

For each DM-RS port, carry out respectively:

In OFDM symbol that this PRB sending at this DM-RS port comprises, except the orthogonal frequency division multiplex OFDM symbol of carrying PDCCH and CRS, select four OFDM symbols;

In the RE comprising at four OFDM symbols selecting, the RE in every two same sub-carrier is combined as to a RE couple;

The RE centering being combined into, select several RE couple;

By each RE of several RE centerings of selecting, be defined as carrying the RE of DM-RS.

3. the sending method of demodulated reference signal as claimed in claim 2, is characterized in that, described MBSFN subframe is sent to described user terminal, specifically comprises:

Select several RE centerings, by least one RE to being divided into a RE group, wherein, if the quantity of DM-RS port is 2 or 4, by a RE to being divided into a RE group, if the quantity of DM-RS port is 8, by two RE in same sub-carrier to being divided into a RE group;

For the each DM-RS port in each DM-RS port set distributes respectively an orthogonal intersection OCC, the quantity of the DM-RS port that the length of the OCC wherein distributing comprises with this DM-RS port set is consistent;

For the each DM-RS port in each DM-RS port set, according to the OCC distributing, the DM-RS that the each RE in each RE group is carried sends to user terminal respectively.

4. the sending method of demodulated reference signal as claimed in claim 2, is characterized in that, described MBSFN subframe adopts regular circulation prefix Normal CP;

Four OFDM symbols selecting for each DM-RS port are:

5. the sending method of demodulated reference signal as claimed in claim 4, is characterized in that, the quantity of DM-RS port is 2;

The each RE determining for each DM-RS port is:

On described the 3rd, the 4th, the 13rd and the 14th OFDM symbol, according to the 2nd that is arranged in order to the order of high frequency by low frequency, the 7th and the 12nd subcarrier.

6. the sending method of demodulated reference signal as claimed in claim 4, is characterized in that, the quantity of DM-RS port is 4 or 8;

The each RE determining for the each DM-RS port in a DM-RS port set is:

On described the 3rd, the 4th, the 13rd and the 14th OFDM symbol, according to the 2nd that is arranged in order to the order of high frequency by low frequency, the 7th and the 12nd subcarrier;

The each RE determining for the each DM-RS port in the 2nd DM-RS port set is:

On described the 3rd, the 4th, the 13rd and the 14th OFDM symbol, according to the 1st that is arranged in order to the order of high frequency by low frequency, the 6th and the 11st subcarrier.

7. the sending method of demodulated reference signal as claimed in claim 2, is characterized in that, described MBSFN subframe adopts extended cyclic prefix Extended CP;

Four OFDM symbols selecting for each DM-RS port are:

8. the sending method of demodulated reference signal as claimed in claim 7, is characterized in that, the quantity of DM-RS port is 2;

The each RE determining for each DM-RS port is:

The 2nd, the 5th, the 8th and the 11st subcarrier on the 3rd and the 4th OFDM symbol, and the 3rd, the 6th, the 9th and the 12nd subcarrier on the 11st and the 12nd OFDM symbol; Or

The 3rd, the 6th, the 9th and the 12nd subcarrier on the 3rd and the 4th OFDM symbol, and the 2nd, the 5th, the 8th and the 11st subcarrier on the 11st and the 12nd OFDM symbol; Or

The 1st, the 4th, the 7th and the 10th subcarrier on the 3rd and the 4th OFDM symbol, and the 3rd, the 6th, the 9th and the 12nd subcarrier on the 11st and the 12nd OFDM symbol; Or

The 3rd, the 6th, the 9th and the 12nd subcarrier on the 3rd and the 4th OFDM symbol, and the 1st, the 4th, the 7th and the 10th subcarrier on the 11st and the 12nd OFDM symbol; Or

The 2nd, the 5th, the 8th and the 11st subcarrier on the 3rd and the 4th OFDM symbol, and the 1st, the 4th, the 7th and the 10th subcarrier on the 11st and the 12nd OFDM symbol; Or

The 1st, the 4th, the 7th and the 10th subcarrier on the 3rd and the 4th OFDM symbol, and the 2nd, the 5th, the 8th and the 11st subcarrier on the 11st and the 12nd OFDM symbol.

9. the sending method of demodulated reference signal as claimed in claim 7, is characterized in that, the quantity of DM-RS port is 4;

The each RE determining for the each DM-RS port in a DM-RS port set is the 2nd, the 5th, the 8th and the 11st subcarrier on the 3rd and the 4th OFDM symbol, and the 3rd, the 6th, the 9th and the 12nd subcarrier on the 11st and the 12nd OFDM symbol, the each RE determining for the each DM-RS port in the 2nd DM-RS port set is the 1st, the 4th, the 7th and the 10th subcarrier on the 3rd and the 4th OFDM symbol, and the 2nd, the 5th, the 8th and the 11st subcarrier on the 11st and the 12nd OFDM symbol; Or

The each RE determining for the each DM-RS port in a DM-RS port set is the 3rd, the 6th, the 9th and the 12nd subcarrier on the 3rd and the 4th OFDM symbol, and the 2nd, the 5th, the 8th and the 11st subcarrier on the 11st and the 12nd OFDM symbol, the each RE determining for the each DM-RS port in the 2nd DM-RS port set is the 2nd, the 5th, the 8th and the 11st subcarrier on the 3rd and the 4th OFDM symbol, and the 1st, the 4th, the 7th and the 10th subcarrier on the 11st and the 12nd OFDM symbol; Or

The each RE determining for the each DM-RS port in a DM-RS port set is the 1st, the 4th, the 7th and the 10th subcarrier on the 3rd and the 4th OFDM symbol, and the 3rd, the 6th, the 9th and the 12nd subcarrier on the 11st and the 12nd OFDM symbol, the each RE determining for the each DM-RS port in the 2nd DM-RS port set is the 2nd, the 5th, the 8th and the 11st subcarrier on the 3rd, the 4th, the 11st and the 12nd OFDM symbol; Or

The each RE determining for the each DM-RS port in a DM-RS port set is the 3rd, the 6th, the 9th and the 12nd subcarrier on the 3rd and the 4th OFDM symbol, and the 1st, the 4th, the 7th and the 10th subcarrier on the 11st and the 12nd OFDM symbol, the each RE determining for the each DM-RS port in the 2nd DM-RS port set is the 2nd, the 5th, the 8th and the 11st subcarrier on the 3rd, the 4th, the 11st and the 12nd OFDM symbol; Or

The each RE determining for the each DM-RS port in a DM-RS port set is the 2nd, the 5th, the 8th and the 11st subcarrier on the 3rd and the 4th OFDM symbol, and the 3rd, the 6th, the 9th and the 12nd subcarrier on the 11st and the 12nd OFDM symbol, the each RE determining for the each DM-RS port in the 2nd DM-RS port set is the 3rd, the 6th, the 9th and the 12nd subcarrier on the 3rd and the 4th OFDM symbol, and the 2nd, the 5th, the 8th and the 11st subcarrier on the 11st and the 12nd OFDM symbol; Or

The each RE determining for the each DM-RS port in a DM-RS port set is the 2nd, the 5th, the 8th and the 11st subcarrier on the 3rd, the 4th, the 11st and the 12nd OFDM symbol, and the each RE determining for the each DM-RS port in the 2nd DM-RS port set is the 3rd, the 6th, the 9th and the 12nd subcarrier on the 3rd, the 4th, the 11st and the 12nd OFDM symbol.

10. the sending method of demodulated reference signal as claimed in claim 7, is characterized in that, the quantity of DM-RS port is 8;

The each RE determining for the each DM-RS port in a DM-RS port set is the 2nd, the 5th, the 8th and the 11st subcarrier on the 3rd, the 4th, the 11st and the 12nd OFDM symbol, and the each RE determining for the each DM-RS port in the 2nd DM-RS port set is the 3rd, the 6th, the 9th and the 12nd subcarrier on the 3rd, the 4th, the 11st and the 12nd OFDM symbol; Or

The each RE determining for the each DM-RS port in a DM-RS port set is the 1st, the 4th, the 7th and the 10th subcarrier on the 3rd, the 4th, the 11st and the 12nd OFDM symbol, and the each RE determining for the each DM-RS port in the 2nd DM-RS port set is the 2nd, the 5th, the 8th and the 11st subcarrier on the 3rd, the 4th, the 11st and the 12nd OFDM symbol.

The dispensing device of 11. 1 kinds of demodulated reference signals, is characterized in that, comprising:

The first determining unit, at the each Physical Resource Block PRB that comprises to the multimedia broadcasting single frequency network MBSFN subframe of user terminal to be sent, determines the PRB distributing into described user terminal;

The second determining unit, RE that comprise for the PRB determining in the first determining unit, except the Resource Unit RE of carrying physical downlink control channel PDCCH and public reference signal CRS, determines the RE that carries demodulated reference signal DM-RS;

Map unit, for being mapped to DM-RS the RE that the second determining unit is determined;

Transmitting element, for sending to described user terminal by the MBSFN subframe after map unit mapping;

The second determining unit specifically comprises:

The dispensing device of 12. demodulated reference signals as claimed in claim 11, is characterized in that, determines that subelement specifically comprises:

First selects module, for for each DM-RS port, in OFDM symbol that this PRB sending at this DM-RS port comprises, except the orthogonal frequency division multiplex OFDM symbol of carrying PDCCH and CRS, selects four OFDM symbols;

The dispensing device of 13. demodulated reference signals as claimed in claim 12, is characterized in that, transmitting element specifically comprises:

Distribute subelement, be used to the each DM-RS port in each DM-RS port set to distribute respectively an orthogonal intersection OCC, the quantity of the DM-RS port that the length of the OCC wherein distributing comprises with this DM-RS port set is consistent;

The dispensing device of 14. demodulated reference signals as claimed in claim 12, is characterized in that, base station MBSFN subframe of giving user terminal to be sent adopts regular circulation prefix Normal CP;

First four OFDM symbols selecting module to select for each DM-RS port are:

The dispensing device of 15. demodulated reference signals as claimed in claim 12, is characterized in that, base station MBSFN subframe of giving user terminal to be sent adopts extended cyclic prefix Extended CP;

First four OFDM symbols selecting module to select for each DM-RS port are:

16. 1 kinds of base stations, is characterized in that, comprise the dispensing device of the demodulated reference signal described in the arbitrary claim of claim 11～15.

The method of reseptance of 17. 1 kinds of demodulated reference signals, is characterized in that, comprising:

In each Physical Resource Block PRB that the multimedia broadcasting single frequency network MBSFN subframe that user terminal sends in base station comprises, determine the PRB distributing into described user terminal;

From the RE determining, receive DM-RS;

The method of reseptance of 18. demodulated reference signals as claimed in claim 17, is characterized in that, for each DM-RS port, determines the RE of carrying DM-RS, specifically comprises:

For each DM-RS port, carry out respectively:

The RE centering being combined into, select several RE couple;

The method of reseptance of 19. demodulated reference signals as claimed in claim 18, is characterized in that, from the RE determining, receives DM-RS, specifically comprises:

Be defined as the orthogonal intersection OCC that the each DM-RS port in each DM-RS port set distributes respectively, the quantity of the DM-RS port that the length of the OCC wherein distributing comprises with this DM-RS port set is consistent;

For the each DM-RS port in each DM-RS port set, according to the OCC determining, from each RE group, receive DM-RS respectively.

The method of reseptance of 20. demodulated reference signals as claimed in claim 18, is characterized in that, the MBSFN subframe that base station sends adopts regular circulation prefix Normal CP;

Four OFDM symbols selecting for each DM-RS port are:

The method of reseptance of 21. demodulated reference signals as claimed in claim 18, is characterized in that, the MBSFN subframe that base station sends adopts extended cyclic prefix Extended CP;

Four OFDM symbols selecting for each DM-RS port are:

The receiving system of 22. 1 kinds of demodulated reference signals, is characterized in that, comprising:

The first determining unit, the each Physical Resource Block PRB comprising for the multimedia broadcasting single frequency network MBSFN subframe sending in base station, determines the PRB distributing into user terminal;

Receiving element, receives DM-RS for the RE determining from the second determining unit;

The second determining unit specifically comprises:

First determines subelement, be used for for each DM-RS port, in RE that this PRB sending at this DM-RS port comprises, except the RE of carrying PDCCH and CRS, determine the RE of carrying DM-RS, wherein, the RE determining for the each DM-RS port in same DM-RS port set is identical, the RE difference of determining for the DM-RS port in different DM-RS port set.

The receiving system of 23. demodulated reference signals as claimed in claim 22, is characterized in that, first determines that subelement specifically comprises:

The receiving system of 24. demodulated reference signals as claimed in claim 23, is characterized in that, receiving element specifically comprises:

Second determines subelement, the orthogonal intersection OCC distributing respectively for being defined as each DM-RS port of each DM-RS port set, and the quantity of the DM-RS port that the length of the OCC wherein distributing comprises with this DM-RS port set is consistent;

The receiving system of 25. demodulated reference signals as claimed in claim 23, is characterized in that, base station sends to the MBSFN subframe of user terminal to adopt regular circulation prefix Normal CP;

First four OFDM symbols selecting module to select for each DM-RS port are:

The receiving system of 26. demodulated reference signals as claimed in claim 23, is characterized in that, base station sends to the MBSFN subframe of user terminal to adopt extended cyclic prefix Extended CP;

First four OFDM symbols selecting module to select for each DM-RS port are:

27. 1 kinds of user terminals, is characterized in that, comprise the receiving system of the demodulated reference signal described in the arbitrary claim of claim 22～26.