CN102378110A

CN102378110A - Methods for sending and receiving demodulated reference signal (DM-RS) and devices for sending and receiving DM-RS

Info

Publication number: CN102378110A
Application number: CN2010102549053A
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: 2012-03-14
Anticipated expiration: 2030-08-16
Also published as: CN102378110B

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 the 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 is by the base station a kind of known signal that sends to user terminal to be provided RS) to reference signal, is used for user terminal and carries out channel estimating or channel measurement.At present, 4 kinds of RS in 3G (Third Generation) Moblie gpp (3GPP, 3rd Generation partnership project), have been defined: the 8th version (R8; Release 8) public reference signal (CRS; Common Reference Signal), the DRS (Dedicated Reference Signal) of R8 (DRS, 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, Channel State Information Reference Signal) of R10.

In OFDM (OFDM, the Orthogonal Frequency Division Multiplexing) system, a Physical Resource Block (PRB; Physical Resource Block) on frequency domain, takies 12 continuous sub-carriers, on 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, when adopting expansion (Extended) CP; A PRB takies 12 continuous OFDM symbols; In PRB, RS is to be unit with Resource Unit (RE, Resource Element); A RS takies several RE on the PRB, and one of them RE is the number of sub-carrier on the OFDM symbol.

At present; The base station is sent the method for CRS, DRS and DM-RS and is confirmed in common subframe; Confirmed that promptly which RE that takies in which common subframe sends above-mentioned RS; Wherein Figure 1A is for sending the PRB sketch map of CRS, DRS and DM-RS in the common subframe that adopts Normal CP, and Figure 1B is for sending the PRB sketch map of CRS, DRS and DM-RS in the common subframe that adopts Extended CP.

Yet; How the base station is at multimedia broadcasting SFN (MBSFN; Multimedia Broadcast Single Frequency Network) sends DM-RS in the subframe; Do not provide concrete technical scheme in the prior art, how user terminal receives DM-RS in the MBSFN subframe, does not also provide concrete technical scheme in the prior art.

Summary of the invention

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

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

Embodiment of the invention technical scheme is following:

A kind of sending method of demodulated reference signal, the method comprising the steps of: in each Physical Resource Block PRB that is comprised to the multimedia broadcasting SFN MBSFN subframe of user terminal to be sent, determine the PRB that distributes into said user terminal; Comprise at this PRB, among the RE except that the Resource Unit RE that carries physical downlink control channel PDCCH and public reference signal CRS, confirm to carry the RE of demodulated reference signal DM-RS; DM-RS is mapped among the RE that determines; Said MBSFN subframe is sent to said user terminal.

A kind of dispensing device of demodulated reference signal comprises: first confirms the unit, is used for each Physical Resource Block PRB of being comprised in multimedia broadcasting SFN MBSFN subframe of giving user terminal to be sent, determines the PRB that distributes into said user terminal; Second confirms the unit, is used for confirming the PRB RE that comprise, except that the Resource Unit RE that carries physical downlink control channel PDCCH and public reference signal CRS that the unit is determined first, confirms to carry the RE of demodulated reference signal DM-RS; Map unit is used for that DM-RS is mapped to second and confirms the RE that the unit is determined; Transmitting element is used for the MBSFN subframe after the map unit mapping is sent to said user terminal.

A kind of method of reseptance of demodulated reference signal, the method comprising the steps of: among each Physical Resource Block PRB that the multimedia broadcasting SFN MBSFN subframe that user terminal sends in the base station is comprised, determine the PRB that distributes into said user terminal; Comprise at this PRB, among the RE except that the Resource Unit RE that carries physical downlink control channel PDCCH and public reference signal CRS, confirm to carry the RE of demodulated reference signal DM-RS; From the RE that determines, receive DM-RS.

A kind of receiving system of demodulated reference signal comprises: first confirms the unit, and each Physical Resource Block PRB that the multimedia broadcasting SFN MBSFN subframe that is used for sending in the base station is comprised determines the PRB that distributes into user terminal; Second confirms the unit, is used for confirming the PRB RE that comprise, except that the Resource Unit RE that carries physical downlink control channel PDCCH and public reference signal CRS that the unit is determined first, confirms to carry the RE of demodulated reference signal DM-RS; Receiving element is used for confirming that from second the RE that the unit is determined receives DM-RS.

In the embodiment of the invention technical scheme; The PRB that distributes into this user terminal is determined, among the RE the RE that comprises at this PRB then, remove carrying PDCCH and CRS in the base station in each PRB that MBSFN subframe of giving user terminal to be sent is comprised; Confirm to carry the RE of DM-RS; DM-RS is mapped among the RE that determines, more above-mentioned MBSFN subframe is sent to this user terminal, thereby realized in the MBSFN subframe, sending the scheme of DM-RS; Owing to carry DM-RS based on the RE except that the RE that carries PDCCH and CRS, therefore just avoided PDCCH and CRS that DM-RS is produced and disturbed.

Description of drawings

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

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

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

Fig. 3 A is in the embodiment of the invention, to the MBSFN subframe that adopts Normal CP, sends the PRB sketch map of PDCCH and CRS;

Fig. 3 B is in the embodiment of the invention, to the MBSFN subframe that adopts Extended CP, sends the PRB sketch map of PDCCH and CRS;

Fig. 4 is in the embodiment of the invention, to the MBSFN subframe that adopts Extended CP, the DM-RS Pattern sketch map when the quantity of DM-RS port is 2;

Fig. 5 is in the embodiment of the invention, to the MBSFN subframe that adopts Extended CP, the DM-RS Pattern sketch map when the quantity of DM-RS port is 4;

Fig. 6 is in the embodiment of the invention, to the MBSFN subframe that adopts Extended CP, the DM-RS Pattern sketch map when the quantity of DM-RS port is 8;

Fig. 7 A～Fig. 7 F is in the embodiment of the invention, to the MBSFN subframe that adopts Extended CP, the DM-RS Pattern sketch map when the quantity of DM-RS port is 2;

Fig. 8 A～Fig. 8 F is in the embodiment of the invention, to the MBSFN subframe that adopts Extended CP, the DM-RS Pattern sketch map when the quantity of DM-RS port is 4;

Fig. 9 A～Fig. 9 B is in the embodiment of the invention, to the MBSFN subframe that adopts Extended CP, the DM-RS Pattern sketch map when the quantity of DM-RS port is 8;

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

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

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

Embodiment

At length set forth to the main realization principle of embodiment of the invention technical scheme, embodiment and to the beneficial effect that should be able to reach below in conjunction with each accompanying drawing.

In order to support multiple-input and multiple-output (MIMO; Multiple-Input-Multiple-Output) transmission; When DM-RS is sent to user terminal in the base station, can send DM-RS based on 2 DM-RS ports, data flow transmitted is 2 data flow between base station and the user terminal at this moment; Also can send DM-RS based on 4 DM-RS ports; Data flow transmitted is 4 data flow between base station and the user terminal at this moment, can also send DM-RS based on 8 DM-RS ports, and data flow transmitted is 8 data flow between base station and the user terminal at this moment.

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

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

Step 21 in each PRB that is comprised to the MBSFN subframe of user terminal to be sent, is determined the PRB that distributes into this user terminal;

If DM-RS need be sent to user terminal in the base station in the MBSFN subframe, then the PRB that this user terminal distributes at first will be confirmed as in the base station in MBSFN subframe to be sent, in the PRB that determines, confirms to send the RE of DM-RS then.

Step 22 among the RE outside the RE that comprises at this PRB, remove carrying Physical Downlink Control Channel (PDCCH, Physical Downlink Control Channel) and CRS, confirms to carry the RE of DM-RS;

In the PRB of MBSFN subframe; Preceding two OFDM symbols are used to transmit PDCCH and CRS, for fear of PDCCH and CRS DM-RS are produced interference, and the embodiment of the invention proposes in the RE that PRB comprised, except that the RE that carries PDCCH and CRS that step 21 is determined; Confirm to carry the RE of DM-RS; Fig. 3 A is the PRB sketch map that in the MBSFN subframe that adopts Normal CP, sends PDCCH and CRS, and Fig. 3 B be the PRB sketch map of transmission PDCCH and CRS in the MBSFN subframe of employing Extended CP, promptly sends preceding two the OFDM symbols among the PRB that PDCCH and CRS taken the MBSFN subframe; To the MBSFN subframe that adopts Normal CP; Back 12 OFDM symbols of PRB can be used for carrying DM-RS, and to the MBSFN subframe that adopts Extended CP, back 10 OFDM symbols of PRB can be used for carrying DM-RS.

Step 23 is mapped to DM-RS among the RE that determines;

Step 24 sends to said user terminal with said MBSFN subframe.

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

Below in detail introduction how to confirm to carry the RE of DM-RS.

The base station has a plurality of DM-RS ports to be used to send DM-RS; In advance the DM-RS port is divided at least one DM-RS port set,, then all DM-RS ports is divided into a DM-RS port set if the quantity of DM-RS port is 2; If the quantity of DM-RS port is 4 or 8; Then all DM-RS ports on average are divided into a DM-RS port set and the 2nd DM-RS port set, when the quantity of DM-RS port was 4, the quantity of the DM-RS port in a DM-RS port set and the 2nd DM-RS port set was 2; When the quantity of DM-RS port was 8, the quantity of the DM-RS port in a DM-RS port set and the 2nd DM-RS port set was 4.

To each DM-RS port; In the RE that this PRB comprised, except that the RE that carries PDCCH and CRS that this DM-RS port sends; Confirm to carry the RE of DM-RS; Wherein, the RE that is determined to each the DM-RS port in the same DM-RS port set is identical, and the RE that is determined to the DM-RS port in the different DM-RS port set is different; That is to say that each the DM-RS port in the same DM-RS port set takies identical RE transmission DM-RS; And each the DM-RS port in the different DM-RS port set takies different RE transmission DM-RS, and the DM-RS that each the DM-RS port in the therefore different DM-RS port set sends adopts the mode of frequency division multiplexing (FDM, Frequency-Division Multiplexing) to distinguish.

For with common subframe in DM-RS pattern (Pattern) be consistent; The embodiment of the invention is established each DM-RS port when sending DM-RS, and the MBSFN subframe to adopting Normal CP takies 12 RE on the PRB; Take four OFDM symbols; MBSFN subframe to adopting Extended CP takies 16 RE on the PRB, takies four OFDM symbols.

Confirm to carry to each DM-RS port DM-RS RE concrete mode can but be not limited to as follows:

To each DM-RS port, at first in the OFDM that this PRB comprised, except that the OFDM symbol that carries PDCCH and CRS that this DM-RS port sends, select four OFDM symbols; Preferably, can realize that the OFDM symbol combination that this PRB comprised, except that the OFDM symbol that carries PDCCH and CRS that this DM-RS port is sent is several OFDM symbols through following manner; 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 that is combined into; Select two OFDM symbols; In the RE that four OFDM symbols selecting are comprised, it is right that the RE on per two same sub-carrier is combined as a RE, the RE centering that is being combined into then; Select several RE right; With each RE of several RE centerings of selecting, confirm as the RE that carries DM-RS, wherein; If it is adjacent that each OFDM symbols comprises two OFDM symbols, it is right then can the adjacent RE of OFDM symbol on per two same sub-carrier to be combined as a RE.

For example; Two OFDM symbols selecting are according to the 3rd OFDM symbol and the 4th OFDM symbols and the 13rd OFDM symbol and the 14th OFDM symbols that the OFDM symbol is formed that the OFDM symbol is formed of being arranged in order by the time order and function order; In 4 OFDM symbols selecting, it is right that two RE that OFDM symbol on the same sub-carrier is adjacent are combined as a RE.

For the DM-RS that each DM-RS port of distinguishing in the same DM-RS port set sends, the embodiment of the invention proposes to adopt the mode of code division multiplexing (CDM, Code-Division Multiplexing) to distinguish; Several RE centerings of above-mentioned selection, at least one RE is organized being divided into a RE, wherein; If the quantity of DM-RS port is 2 or 4, then a RE is organized being divided into a RE, if the quantity of DM-RS port is 8; Then two RE on the same sub-carrier are organized being divided into a RE, for example, the quantity of the DM-RS port that the DM-RS port set comprises is 2; Each RE that then will select comprises 2 RE to being divided into a RE group in each RE group, that is to say that each DM-RS port set need take several RE when sending DM-RS; For each the DM-RS port in each DM-RS port set distributes an orthogonal intersection (OCC, Orthogonal Cover Code) respectively, the length of the OCC that wherein distributes is consistent with the quantity of the DM-RS port that this DM-RS port set comprises; For example; The quantity of the DM-RS port that the DM-RS port set comprises is 2, then is that the length of the OCC of each the DM-RS port assignment in this DM-RS port set is 2, to each the DM-RS port in each DM-RS port set; According to the OCC that distributes, the DM-RS that each RE carried in each RE group is sent to user terminal respectively.

For example, DM-RS port 0 is formed a DM-RS port set with the DM-RS port one, and wherein DM-RS port 0 takies identical RE with the DM-RS port one and sends DM-RS; The OCC that distributes for DM-RS port 0 is (1 ,-1), and the OCC that distributes for the DM-RS port one is (1; 1), the RE that selects is to being 6, and each RE is to corresponding RE group; DM-RS port 0 sends to user terminal according to (1 ,-1) with the DM-RS that each RE carried in each RE group; The DM-RS port one sends to user terminal according to (1,1) with the DM-RS that each RE carried in each RE group.

Introduce to the DM-RS Pattern in the MBSFN subframe of DM-RS Pattern in the MBSFN subframe that adopts Normal CP and employing Extended CP respectively below.

MBSFN subframe to employing Normal CP:

Because preceding two OFDM symbols are used to pass PDCCH and CRS; Therefore four OFDM symbols that transmit DM-RS need be selected from the 3rd～the 14th the OFDM symbol that is arranged in order by the order after arriving first according to the time; Consider the interpolation 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 with the 3rd OFDM symbol and the synthetic OFDM symbols of the 4th OFDM symbols, with the 5th OFDM symbol and the 6th synthetic OFDM symbols of OFDM symbols, with the 7th OFDM symbol and the 8th synthetic OFDM symbols of OFDM symbols, with the 9th OFDM symbol and the 10th synthetic OFDM symbols of OFDM symbols, with the 11st OFDM symbol and the 12nd synthetic OFDM symbols of OFDM symbols, with the 13rd OFDM symbol and the 14th synthetic OFDM symbols of OFDM symbols, the OFDM symbols of selecting to form and by the 13rd OFDM symbol and the 14th the OFDM symbols that the OFDM symbol is formed by the 3rd OFDM symbol and the 4th OFDM symbol.

In 4 OFDM symbols selecting, it is right that two RE that OFDM symbol on the same sub-carrier is adjacent are combined as a RE.

When the quantity of DM-RS port is 2 (being respectively DM-RS port 0 and DM-RS port one); This moment, a RE organized by a RE forming; Select 6 RE right the RE centering of combination; For the RE that each DM-RS port is taken evenly distributes, this moment DM-RS Pattern can but be not limited to as shown in Figure 4, with the subcarrier among the PRB according to being arranged in order by the order of low frequency to high frequency; The 2nd, the 7th and the 12nd number of sub-carrier on this PRB comprised the 3rd, the 4th, the 13rd and the 14th the OFDM symbol that each DM-RS port is sent are confirmed as the RE that carries 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 is formed a DM-RS port set with the DM-RS port one, and DM-RS port 2 is formed the 2nd DM-RS port set with DM-RS port 3) time, this moment, a RE organized by a RE forming; Select 12 RE right the RE centering of combination; For the RE that each DM-RS port is taken evenly distributes, this moment DM-RS Pattern can but be not limited to as shown in Figure 5, with the subcarrier among the PRB according to being arranged in order by the order of low frequency to high frequency; To each the DM-RS port in the DM-RS port set; With the 2nd, the 7th and the 12nd number of sub-carrier on the 3rd, the 4th, the 13rd and the 14th the OFDM symbol, confirm as the RE that carries DM-RS, to each the DM-RS port in the 2nd DM-RS port set; With the 1st, the 6th and the 11st number of sub-carrier on the 3rd, the 4th, the 13rd and the 14th the OFDM symbol, confirm as the RE that carries DM-RS.

When being 8, the quantity of DM-RS port (is respectively DM-RS port 0～7; Wherein DM-RS port 0～3 is formed a DM-RS port set, and DM-RS port 4～7 is formed the 2nd DM-RS port set) time, this moment, a RE organized by 2 RE forming; Select 12 RE right the RE centering of combination; For the RE that each DM-RS port is taken evenly distributes, this moment DM-RS Pattern can but be not limited to as shown in Figure 6, with the subcarrier among the PRB according to being arranged in order by the order of low frequency to high frequency; To each the DM-RS port in the DM-RS port set; With the 2nd, the 7th and the 12nd number of sub-carrier on the 3rd, the 4th, the 13rd and the 14th the OFDM symbol, confirm as the RE that carries DM-RS, to each the DM-RS port in the 2nd DM-RS port set; With the 1st, the 6th and the 11st number of sub-carrier on the 3rd, the 4th, the 13rd and the 14th the OFDM symbol, confirm as the RE that carries DM-RS.

MBSFN subframe to employing Extended CP:

Because preceding two OFDM symbols are used to pass PDCCH and CRS; Therefore four OFDM symbols that transmit DM-RS need be selected from the 3rd～the 12nd the OFDM symbol that is arranged in order by the order after arriving first according to the time; Consider the interpolation 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 with the 3rd OFDM symbol and the synthetic OFDM symbols of the 4th OFDM symbols, with the 5th OFDM symbol and the 6th synthetic OFDM symbols of OFDM symbols, with the 7th OFDM symbol and the 8th synthetic OFDM symbols of OFDM symbols, with the 9th OFDM symbol and the 10th synthetic OFDM symbols of OFDM symbols, with the 11st OFDM symbol and the 12nd synthetic OFDM symbols of OFDM symbols, the OFDM symbols of selecting to form and by the 11st OFDM symbol and the 12nd the OFDM symbols that the OFDM symbol is formed by the 3rd OFDM symbol and the 4th OFDM symbol.

When the quantity of DM-RS port is 2 (being respectively DM-RS port 0 and DM-RS port one); This moment, a RE organized by a RE forming; Select 8 RE right the RE centering of combination; For the RE that each DM-RS port is taken evenly distributes, this moment DM-RS Pattern can but be not limited to shown in Fig. 7 A～7F, with the subcarrier among the PRB according to being arranged in order by the order of low frequency to high frequency.

Among Fig. 7 A, with the 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 3rd and the 4th the OFDM symbol, and the 3rd, the 6th, the 9th and the 12nd number of sub-carrier on the 11st and the 12nd the OFDM symbol, confirm as the RE that carries DM-RS;

Among Fig. 7 B, with the 3rd, the 6th, the 9th and the 12nd number of sub-carrier on the 3rd and the 4th the OFDM symbol, and the 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 11st and the 12nd the OFDM symbol, confirm as the RE that carries DM-RS;

Among Fig. 7 C, with the 1st, the 4th, the 7th and the 10th number of sub-carrier on the 3rd and the 4th the OFDM symbol, and the 3rd, the 6th, the 9th and the 12nd number of sub-carrier on the 11st and the 12nd the OFDM symbol, confirm as the RE that carries DM-RS;

Among Fig. 7 D, with the 3rd, the 6th, the 9th and the 12nd number of sub-carrier on the 3rd and the 4th the OFDM symbol, and the 1st, the 4th, the 7th and the 10th number of sub-carrier on the 11st and the 12nd the OFDM symbol, confirm as the RE that carries DM-RS;

Among Fig. 7 E, with the 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 3rd and the 4th the OFDM symbol, and the 1st, the 4th, the 7th and the 10th number of sub-carrier on the 11st and the 12nd the OFDM symbol, confirm as the RE that carries DM-RS;

Among Fig. 7 F, with the 1st, the 4th, the 7th and the 10th number of sub-carrier on the 3rd and the 4th the OFDM symbol, and the 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 11st and the 12nd the OFDM symbol, confirm as the RE that carries 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 is formed a DM-RS port set with the DM-RS port one; DM-RS port 2 is formed the 2nd DM-RS port set with DM-RS port 3) time; This moment, a RE group to forming, selected 16 RE right the RE centering of combination, for the RE that each DM-RS port is taken evenly distributes by a RE; This moment DM-RS Pattern can but be not limited to shown in Fig. 8 A～8F, with the subcarrier among the PRB according to being arranged in order by the order of low frequency to high frequency.

Among Fig. 8 A; To each the DM-RS port in the DM-RS port set; With the 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 3rd and the 4th the OFDM symbol, and the 3rd, the 6th, the 9th and the 12nd number of sub-carrier on the 11st and the 12nd the OFDM symbol, confirm as the RE that carries DM-RS; To each the DM-RS port in the 2nd DM-RS port set; With the 1st, the 4th, the 7th and the 10th number of sub-carrier on the 3rd and the 4th the OFDM symbol, and the 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 11st and the 12nd the OFDM symbol, confirm as the RE that carries DM-RS;

Among Fig. 8 B; To each the DM-RS port in the DM-RS port set; With the 3rd, the 6th, the 9th and the 12nd number of sub-carrier on the 3rd and the 4th the OFDM symbol, and the 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 11st and the 12nd the OFDM symbol, confirm as the RE that carries DM-RS; To each the DM-RS port in the 2nd DM-RS port set; With the 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 3rd and the 4th the OFDM symbol, and the 1st, the 4th, the 7th and the 10th number of sub-carrier on the 11st and the 12nd the OFDM symbol, confirm as the RE that carries DM-RS;

Among Fig. 8 C; To each the DM-RS port in the DM-RS port set; With the 1st, the 4th, the 7th and the 10th number of sub-carrier on the 3rd and the 4th the OFDM symbol; And the 3rd, the 6th, the 9th and the 12nd number of sub-carrier on the 11st and the 12nd the OFDM symbol, confirm as the RE that carries DM-RS, to each the DM-RS port in the 2nd DM-RS port set; With the 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 3rd, the 4th, the 11st and the 12nd the OFDM symbol, confirm as the RE that carries DM-RS;

Among Fig. 8 D; To each the DM-RS port in the DM-RS port set; With the 3rd, the 6th, the 9th and the 12nd number of sub-carrier on the 3rd and the 4th the OFDM symbol; And the 1st, the 4th, the 7th and the 10th number of sub-carrier on the 11st and the 12nd the OFDM symbol, confirm as the RE that carries DM-RS, to each the DM-RS port in the 2nd DM-RS port set; With the 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 3rd, the 4th, the 11st and the 12nd the OFDM symbol, confirm as the RE that carries DM-RS;

Among Fig. 8 E; To each the DM-RS port in the DM-RS port set; With the 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 3rd and the 4th the OFDM symbol, and the 3rd, the 6th, the 9th and the 12nd number of sub-carrier on the 11st and the 12nd the OFDM symbol, confirm as the RE that carries DM-RS; To each the DM-RS port in the 2nd DM-RS port set; With the 3rd, the 6th, the 9th and the 12nd number of sub-carrier on the 3rd and the 4th the OFDM symbol, and the 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 11st and the 12nd the OFDM symbol, confirm as the RE that carries DM-RS;

Among Fig. 8 F; To each the DM-RS port in the DM-RS port set; With the 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 3rd, the 4th, the 11st and the 12nd the OFDM symbol, confirm as the RE that carries DM-RS, to each the DM-RS port in the 2nd DM-RS port set; With the 3rd, the 6th, the 9th and the 12nd number of sub-carrier on the 3rd, the 4th, the 11st and the 12nd the OFDM symbol, confirm as the RE that carries DM-RS.

When being 8, the quantity of DM-RS port (is respectively DM-RS port 0～7; Wherein DM-RS port 0～3 is formed a DM-RS port set, and DM-RS port 4～7 is formed the 2nd DM-RS port set) time, this moment, a RE organized by two RE forming; Select 16 RE right the RE centering of combination; Two RE that each RE group comprises are to being positioned on the same subcarrier, for the RE that each DM-RS port is taken evenly distributes, the DM-RS Pattern of this moment can but be not limited to shown in Fig. 9 A～Fig. 9 B.

Among Fig. 9 A; To each the DM-RS port in the DM-RS port set; With the 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 3rd, the 4th, the 11st and the 12nd the OFDM symbol, confirm as the RE that carries DM-RS, to each the DM-RS port in the 2nd DM-RS port set; With the 3rd, the 6th, the 9th and the 12nd number of sub-carrier on the 3rd, the 4th, the 11st and the 12nd the OFDM symbol, confirm as the RE that carries DM-RS;

Among Fig. 9 B; To each the DM-RS port in the DM-RS port set; With the 1st, the 4th, the 7th and the 10th number of sub-carrier on the 3rd, the 4th, the 11st and the 12nd the OFDM symbol, confirm as the RE that carries DM-RS, to each the DM-RS port in the 2nd DM-RS port set; With the 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 3rd, the 4th, the 11st and the 12nd the OFDM symbol, confirm as the RE that carries DM-RS.

In above-mentioned Fig. 4～Fig. 9 B, the DM-RS port in each DM-RS port set can exchange, and promptly 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 is to squinting the DM-RS Pattern that obtains separately also within protection range of the present invention on frequency domain or the time domain.

Can know that by above-mentioned processing procedure in the embodiment of the invention technical scheme, the base station is in each PRB that is comprised to the MBSFN subframe of user terminal to be sent; Determine the PRB that distributes for this user terminal; Comprise at this PRB then, among the RE except that the RE that carries PDCCH and CRS, confirm to carry the RE of DM-RS, DM-RS is mapped among the RE that determines; Again above-mentioned MBSFN subframe is sent to this user terminal; Thereby realized in the MBSFN subframe, sending the scheme of DM-RS,, therefore just avoided PDCCH and CRS that DM-RS is produced and disturbed owing to carry DM-RS based on the RE except that the RE that carries PDCCH and CRS.

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

First confirms unit 101, is used for each PRB of being comprised in MBSFN subframe of giving user terminal to be sent, determines the PRB that distributes into said user terminal;

Second confirms unit 102, is used for confirming the PRB RE that comprise, except that the RE that carries PDCCH and CRS that unit 101 is determined first, confirms to carry the RE of DM-RS;

Map unit 103 is used for that DM-RS is mapped to second and confirms the RE that unit 102 is determined;

Transmitting element 104 is used for the MBSFN subframe after map unit 103 mappings is sent to said user terminal.

Preferably, second confirms that unit 102 comprises that specifically first divides subelement and definite subelement, wherein:

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

Confirm subelement; Be used for to each DM-RS port; In the RE that this PRB comprised, except that the RE that carries PDCCH and CRS that this DM-RS port sends, confirm to carry the RE of DM-RS, wherein; The RE that is determined to each the DM-RS port in the same DM-RS port set is identical, and the RE that is determined to the DM-RS port in the different DM-RS port set is different.

More preferably, confirm that subelement comprises that specifically first selects module, composite module, second to select module and determination module, wherein:

First selects module, is used for to each DM-RS port, in the OFDM symbol that this PRB comprised, except that the OFDM symbol that carries PDCCH and CRS that this DM-RS port sends, selects four OFDM symbols;

Composite module is used for to each DM-RS port, and in the RE that four OFDM symbols that the first selection module is selected are comprised, it is right that the RE on per two same sub-carrier is combined as a RE;

Second selects module, is used for the RE centering that composite module is combined into, selecting several RE right to each DM-RS port;

Determination module is used for to each DM-RS port, with second select several RE centerings that module selects each RE, confirm as the RE that carries DM-RS.

More preferably, transmitting element 104 comprises that specifically second divides subelement, distributes subelement and send subelement, wherein:

Second divides subelement; Be used for several RE centerings, at least one RE organized being divided into a RE, wherein in the second selection module selection; If the quantity of DM-RS port is 2 or 4; Then a RE is organized being divided into a RE,, then two RE on the same sub-carrier are organized being divided into a RE if the quantity of DM-RS port is 8;

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

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

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

First selects module to four OFDM symbols of each DM-RS port selection to be:

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

First selects module to four OFDM symbols of each DM-RS port selection to be:

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 invention also provides a kind of base station, comprises the dispensing device of above-mentioned demodulated reference signal, wherein the dispensing device of demodulated reference signal can but be not limited to place the base station.

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

Step 111 among each PRB that the MBSFN subframe that user terminal sends in the base station is comprised, is determined the PRB that distributes into said user terminal;

Step 112, comprise at this PRB, among the RE except that the RE that carries PDCCH and CRS, confirm to carry the RE of DM-RS;

Wherein, comprise at this PRB, among the RE except that the RE that carries PDCCH and CRS, confirm to carry the RE of DM-RS, can but be not limited to following manner:

The DM-RS port that sends DM-RS is divided at least one DM-RS port set; If the quantity of DM-RS port is 2; Then all DM-RS ports are divided into a DM-RS port set,, then all DM-RS ports on average are divided into a DM-RS port set and the 2nd DM-RS port set if the quantity of DM-RS port is 4 or 8; To each DM-RS port; In the RE that this PRB comprised, except that the RE that carries PDCCH and CRS that this DM-RS port sends, confirm to carry the RE of DM-RS, wherein; The RE that is determined to each the DM-RS port in the same DM-RS port set is identical, and the RE that is determined to the DM-RS port in the different DM-RS port set is different.

To each DM-RS port, this DM-RS port send this PRB comprised, remove among the RE the RE that carries PDCCH and CRS, confirm the RE of carrying DM-RS, can but be not limited to following manner:

To each DM-RS port; In the OFDM symbol that this PRB comprised, except that the OFDM symbol that carries PDCCH and CRS that this DM-RS port sends, select four OFDM symbols, in the RE that four OFDM symbols selecting are comprised, it is right that the RE on per two same sub-carrier is combined as a RE; The RE centering that is being combined into; Select several RE right,, confirm as the RE that carries DM-RS each RE of several RE centerings of selecting.

Step 113 receives DM-RS from the RE that determines.

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

Several RE centerings of selecting, at least one RE is organized being divided into a RE, wherein; If the quantity of DM-RS port is 2 or 4, then a RE is organized being divided into a RE, if the quantity of DM-RS port is 8; Then two RE on the same sub-carrier are organized being divided into a RE; Confirm as the OCC that each the DM-RS port in each DM-RS port set distributes respectively, the length of the OCC that wherein distributes is consistent with the quantity of the DM-RS port that this DM-RS port set comprises, to each the DM-RS port in each DM-RS port set; According to the OCC that determines, from each RE group, receive DM-RS respectively.

Wherein, If the MBSFN subframe that send the base station adopts regular circulation prefix Normal CP, four OFDM symbols then selecting to each DM-RS port can but be not limited to: 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 send the base station adopts extended cyclic prefix Extended CP, four OFDM symbols then selecting to each DM-RS port can but be not limited to: 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 that provides for the embodiment of the invention; Any one DM-RS Pattern of providing of Fig. 4 to Fig. 8 F for example, user terminal can be on corresponding RE, on promptly corresponding OFDM symbol and the subcarrier; Receive the DM-RS that send the base station, repeat no more here.

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

First confirms unit 121, and each PRB that the MBSFN subframe that is used for sending in the base station is comprised determines the PRB that distributes into user terminal;

Second confirms unit 122, is used for confirming the PRB RE that comprise, except that the RE that carries PDCCH and CRS that unit 121 is determined first, confirms to carry the RE of DM-RS;

Receiving element 123 is used for confirming that from second the RE that unit 122 is determined receives DM-RS.

Preferably, second confirms that unit 122 comprises that specifically first divides subelement and first definite subelement, wherein:

First confirms subelement; Be used for to each DM-RS port; In the RE that this PRB comprised, except that the RE that carries PDCCH and CRS that this DM-RS port sends, confirm to carry the RE of DM-RS, wherein; The RE that is determined to each the DM-RS port in the same DM-RS port set is identical, and the RE that is determined to the DM-RS port in the different DM-RS port set is different;

More preferably, first confirms that subelement comprises that specifically first selects module, composite module, second to select module and determination module, wherein:

Second selects module, is used for the RE centering that is combined into, selecting several RE right to each DM-RS port;

Determination module is used for each RE of selecting several RE centerings that module selects with second, confirms as the RE that carries DM-RS.

More preferably, receiving element 123 comprises that specifically second divides subelement, second definite subelement and receive subelement, wherein:

Second confirms subelement, is used for confirming as the OCC that each DM-RS port of each DM-RS port set distributes respectively, and the length of the OCC that wherein distributes is consistent with the quantity of the DM-RS port that this DM-RS port set comprises;

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

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

First select four OFDM symbols that module selects to each DM-RS port can but be not limited to:

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

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

Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.

Claims

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

In each Physical Resource Block PRB that is comprised to the multimedia broadcasting SFN MBSFN subframe of user terminal to be sent, determine the PRB that distributes into said user terminal;

Comprise at this PRB, among the RE except that the Resource Unit RE that carries physical downlink control channel PDCCH and public reference signal CRS, confirm to carry the RE of demodulated reference signal DM-RS;

DM-RS is mapped among the RE that determines;

Said MBSFN subframe is sent to said user terminal.

2. the sending method of demodulated reference signal as claimed in claim 1 is characterized in that, comprise at this PRB, among the RE except that the RE that carries PDCCH and CRS, confirm to carry the RE of DM-RS, specifically comprise:

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

To each DM-RS port; In the RE that this PRB comprised, except that the RE that carries PDCCH and CRS that this DM-RS port sends; Confirm to carry the RE of DM-RS; Wherein, the RE that is determined to each the DM-RS port in the same DM-RS port set is identical, and the RE that is determined to the DM-RS port in the different DM-RS port set is different.

3. the sending method of demodulated reference signal as claimed in claim 2 is characterized in that, to each DM-RS port, confirms to carry the RE of DM-RS, specifically comprises:

To each DM-RS port, carry out respectively:

In the OFDM symbol that this PRB comprised, except that the orthogonal frequency division multiplex OFDM symbol that carries PDCCH and CRS that this DM-RS port sends, select four OFDM symbols;

In the RE that four OFDM symbols selecting are comprised, it is right that the RE on per two same sub-carrier is combined as a RE;

The RE centering that is combined into, select several RE right;

With each RE of several RE centerings of selecting, confirm as the RE that carries DM-RS.

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

Several RE centerings of selecting, at least one RE is organized being divided into a RE, wherein; If the quantity of DM-RS port is 2 or 4; Then a RE is organized being divided into a RE,, then two RE on the same sub-carrier are organized being divided into a RE if the quantity of DM-RS port is 8;

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

To each the DM-RS port in each DM-RS port set,, the DM-RS that each RE carried in each RE group is sent to user terminal respectively according to the OCC that distributes.

5. the sending method of demodulated reference signal as claimed in claim 3 is characterized in that, said MBSFN subframe adopts regular circulation prefix Normal CP;

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

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

Each RE that determines to each DM-RS port is:

On said the 3rd, the 4th, the 13rd and the 14th the OFDM symbol, according to the 2nd, the 7th and the 12nd number of sub-carrier being arranged in order to the order of high frequency by low frequency.

7. the sending method of demodulated reference signal as claimed in claim 5 is characterized in that, the quantity of DM-RS port is 4 or 8;

Each RE that determines to each the DM-RS port in the DM-RS port set is:

On said the 3rd, the 4th, the 13rd and the 14th the OFDM symbol, according to the 2nd, the 7th and the 12nd number of sub-carrier being arranged in order to the order of high frequency by low frequency;

Each RE that determines to each the DM-RS port in the 2nd DM-RS port set is:

On said the 3rd, the 4th, the 13rd and the 14th the OFDM symbol, according to the 1st, the 6th and the 11st number of sub-carrier being arranged in order to the order of high frequency by low frequency.

8. the sending method of demodulated reference signal as claimed in claim 3 is characterized in that, said MBSFN subframe adopts extended cyclic prefix Extended CP;

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

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

Each RE that determines to each DM-RS port is:

The 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 3rd and the 4th the OFDM symbol, and the 3rd, the 6th, the 9th and the 12nd number of sub-carrier on the 11st and the 12nd the OFDM symbol; Perhaps

The 3rd, the 6th, the 9th and the 12nd number of sub-carrier on the 3rd and the 4th the OFDM symbol, and the 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 11st and the 12nd the OFDM symbol; Perhaps

The 1st, the 4th, the 7th and the 10th number of sub-carrier on the 3rd and the 4th the OFDM symbol, and the 3rd, the 6th, the 9th and the 12nd number of sub-carrier on the 11st and the 12nd the OFDM symbol; Perhaps

The 3rd, the 6th, the 9th and the 12nd number of sub-carrier on the 3rd and the 4th the OFDM symbol, and the 1st, the 4th, the 7th and the 10th number of sub-carrier on the 11st and the 12nd the OFDM symbol; Perhaps

The 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 3rd and the 4th the OFDM symbol, and the 1st, the 4th, the 7th and the 10th number of sub-carrier on the 11st and the 12nd the OFDM symbol; Perhaps

The 1st, the 4th, the 7th and the 10th number of sub-carrier on the 3rd and the 4th the OFDM symbol, and the 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 11st and the 12nd the OFDM symbol.

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

Each RE that determines to each the DM-RS port in the DM-RS port set is the 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 3rd and the 4th the OFDM symbol; And the 3rd, the 6th, the 9th and the 12nd number of sub-carrier on the 11st and the 12nd the OFDM symbol; Each RE that determines to each the DM-RS port in the 2nd DM-RS port set is the 1st, the 4th, the 7th and the 10th number of sub-carrier on the 3rd and the 4th the OFDM symbol, and the 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 11st and the 12nd the OFDM symbol; Perhaps

Each RE that determines to each the DM-RS port in the DM-RS port set is the 3rd, the 6th, the 9th and the 12nd number of sub-carrier on the 3rd and the 4th the OFDM symbol; And the 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 11st and the 12nd the OFDM symbol; Each RE that determines to each the DM-RS port in the 2nd DM-RS port set is the 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 3rd and the 4th the OFDM symbol, and the 1st, the 4th, the 7th and the 10th number of sub-carrier on the 11st and the 12nd the OFDM symbol; Perhaps

Each RE that determines to each the DM-RS port in the DM-RS port set is the 1st, the 4th, the 7th and the 10th number of sub-carrier on the 3rd and the 4th the OFDM symbol; And the 3rd, the 6th, the 9th and the 12nd number of sub-carrier on the 11st and the 12nd the OFDM symbol, each RE that determines to each the DM-RS port in the 2nd DM-RS port set is the 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 3rd, the 4th, the 11st and the 12nd the OFDM symbol; Perhaps

Each RE that determines to each the DM-RS port in the DM-RS port set is the 3rd, the 6th, the 9th and the 12nd number of sub-carrier on the 3rd and the 4th the OFDM symbol; And the 1st, the 4th, the 7th and the 10th number of sub-carrier on the 11st and the 12nd the OFDM symbol, each RE that determines to each the DM-RS port in the 2nd DM-RS port set is the 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 3rd, the 4th, the 11st and the 12nd the OFDM symbol; Perhaps

Each RE that determines to each the DM-RS port in the DM-RS port set is the 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 3rd and the 4th the OFDM symbol; And the 3rd, the 6th, the 9th and the 12nd number of sub-carrier on the 11st and the 12nd the OFDM symbol; Each RE that determines to each the DM-RS port in the 2nd DM-RS port set is the 3rd, the 6th, the 9th and the 12nd number of sub-carrier on the 3rd and the 4th the OFDM symbol, and the 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 11st and the 12nd the OFDM symbol; Perhaps

Each RE that determines to each the DM-RS port in the DM-RS port set is the 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 3rd, the 4th, the 11st and the 12nd the OFDM symbol, and each RE that determines to each the DM-RS port in the 2nd DM-RS port set is the 3rd, the 6th, the 9th and the 12nd number of sub-carrier on the 3rd, the 4th, the 11st and the 12nd the OFDM symbol.

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

Each RE that determines to each the DM-RS port in the DM-RS port set is the 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 3rd, the 4th, the 11st and the 12nd the OFDM symbol, and each RE that determines to each the DM-RS port in the 2nd DM-RS port set is the 3rd, the 6th, the 9th and the 12nd number of sub-carrier on the 3rd, the 4th, the 11st and the 12nd the OFDM symbol; Perhaps

Each RE that determines to each the DM-RS port in the DM-RS port set is the 1st, the 4th, the 7th and the 10th number of sub-carrier on the 3rd, the 4th, the 11st and the 12nd the OFDM symbol, and each RE that determines to each the DM-RS port in the 2nd DM-RS port set is the 2nd, the 5th, the 8th and the 11st number of sub-carrier on the 3rd, the 4th, the 11st and the 12nd the OFDM symbol.

12. the dispensing device of a demodulated reference signal is characterized in that, comprising:

First confirms the unit, is used for each Physical Resource Block PRB of being comprised in multimedia broadcasting SFN MBSFN subframe of giving user terminal to be sent, determines the PRB that distributes into said user terminal;

Second confirms the unit, is used for confirming the PRB RE that comprise, except that the Resource Unit RE that carries physical downlink control channel PDCCH and public reference signal CRS that the unit is determined first, confirms to carry the RE of demodulated reference signal DM-RS;

Map unit is used for that DM-RS is mapped to second and confirms the RE that the unit is determined;

Transmitting element is used for the MBSFN subframe after the map unit mapping is sent to said user terminal.

13. the dispensing device of demodulated reference signal as claimed in claim 12 is characterized in that, second confirms that the unit specifically comprises:

14. the dispensing device of demodulated reference signal as claimed in claim 13 is characterized in that, confirms that subelement specifically comprises:

First selects module, is used for to each DM-RS port, in the OFDM symbol that this PRB comprised, except that the orthogonal frequency division multiplex OFDM symbol that carries PDCCH and CRS that this DM-RS port sends, selects four OFDM symbols;

15. the dispensing device of demodulated reference signal as claimed in claim 14 is characterized in that, transmitting element specifically comprises:

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

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

First selects module to four OFDM symbols of each DM-RS port selection to be:

17. the dispensing device of demodulated reference signal as claimed in claim 14 is characterized in that, the said base station MBSFN subframe of user terminal of giving to be sent adopts extended cyclic prefix Extended CP;

First selects module to four OFDM symbols of each DM-RS port selection to be:

18. a base station is characterized in that, comprises the dispensing device of the described demodulated reference signal of the arbitrary claim of claim 12～17.

19. the method for reseptance of a demodulated reference signal is characterized in that, comprising:

Among each Physical Resource Block PRB that the multimedia broadcasting SFN MBSFN subframe that user terminal sends in the base station is comprised, determine the PRB that distributes into said user terminal;

From the RE that determines, receive DM-RS.

20. the method for reseptance of demodulated reference signal as claimed in claim 19 is characterized in that, comprise at this PRB, among the RE except that the RE that carries PDCCH and CRS, confirm to carry the RE of DM-RS, specifically comprise:

21. the method for reseptance of demodulated reference signal as claimed in claim 20 is characterized in that, to each DM-RS port, confirms to carry the RE of DM-RS, specifically comprises:

To each DM-RS port, carry out respectively:

The RE centering that is combined into, select several RE right;

22. the method for reseptance of demodulated reference signal as claimed in claim 21 is characterized in that, from the RE that determines, receives DM-RS, specifically comprises:

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

To each the DM-RS port in each DM-RS port set,, from each RE group, receive DM-RS respectively according to the OCC that determines.

23. the method for reseptance of demodulated reference signal as claimed in claim 21 is characterized in that, the MBSFN subframe that send the base station adopts regular circulation prefix Normal CP;

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

24. the method for reseptance of demodulated reference signal as claimed in claim 21 is characterized in that, the MBSFN subframe that send the base station adopts extended cyclic prefix Extended CP;

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

25. the receiving system of a demodulated reference signal is characterized in that, comprising:

First confirms the unit, and each Physical Resource Block PRB that the multimedia broadcasting SFN MBSFN subframe that is used for sending in the base station is comprised determines the PRB that distributes into user terminal;

Receiving element is used for confirming that from second the RE that the unit is determined receives DM-RS.

26. the receiving system of demodulated reference signal as claimed in claim 25 is characterized in that, second confirms that the unit specifically comprises:

First confirms subelement; Be used for to each DM-RS port; In the RE that this PRB comprised, except that the RE that carries PDCCH and CRS that this DM-RS port sends, confirm to carry the RE of DM-RS, wherein; The RE that is determined to each the DM-RS port in the same DM-RS port set is identical, and the RE that is determined to the DM-RS port in the different DM-RS port set is different.

27. the receiving system of demodulated reference signal as claimed in claim 26 is characterized in that, first confirms that subelement specifically comprises:

28. the receiving system of demodulated reference signal as claimed in claim 27 is characterized in that, receiving element specifically comprises:

Second confirms subelement, is used for confirming as the orthogonal intersection OCC that each DM-RS port of each DM-RS port set distributes respectively, and the length of the OCC that wherein distributes is consistent with the quantity of the DM-RS port that this DM-RS port set comprises;

29. the receiving system of demodulated reference signal as claimed in claim 27 is characterized in that, the MBSFN subframe that the base station sends to user terminal adopts regular circulation prefix Normal CP;

First selects module to four OFDM symbols of each DM-RS port selection to be:

30. the receiving system of demodulated reference signal as claimed in claim 27 is characterized in that, the MBSFN subframe that the base station sends to user terminal adopts extended cyclic prefix Extended CP;

First selects module to four OFDM symbols of each DM-RS port selection to be:

31. a user terminal is characterized in that, comprises the receiving system of the described demodulated reference signal of the arbitrary claim of claim 25～30.