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CN102378114B - Transmitting method and device of channel status information reference signal and receiving method and device of channel status information reference signal - Google Patents

Transmitting method and device of channel status information reference signal and receiving method and device of channel status information reference signal Download PDF

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CN102378114B
CN102378114B CN201010255373.5A CN201010255373A CN102378114B CN 102378114 B CN102378114 B CN 102378114B CN 201010255373 A CN201010255373 A CN 201010255373A CN 102378114 B CN102378114 B CN 102378114B
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csi
res
port
reference signal
carrying
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CN102378114A (en
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史志华
徐晓东
刘建军
王启星
刘光毅
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China Mobile Communications Group Co Ltd
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China Mobile Communications Group Co Ltd
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Abstract

The invention discloses a transmitting method and device of a channel status information reference signal and a receiving method and device of the channel status information reference signal. The method comprises the steps of: respectively ensuring a crime scene investigation-remote sensing (CSI-RS)-carried root explorer (RE) in the REs which are included by each permeable reactive barrier (PRB) of a multicast single frequency network (MBSFN) subframe and except the RE which carries a physical downlink control channel (PDCCH), a computer reservation system (CRS) and a data management-remote sensor (DM-RS) aiming at each cell; mapping CSI-RS which needs to be transmitted to the cell into the ensured RE; and transmitting the MBSFN subframe to a plurality of user terminals in each cell. The invention provides a specific technical solution through which a base station transmits the CSI-RS in the MBSFN subframe and the user terminals receive the CSI-RS in the MBSFN subframe.

Description

Channel state information reference signals sending method 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 channel state information reference signals sending method and device, method of reseptance and device.
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 CSI-RS in subframe, in prior art, do not provide concrete technical scheme, how user terminal receives CSI-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 channel state information reference signals sending method and device, method of reseptance and device, and the concrete technical scheme of CSI-RS is provided in MBSFN subframe in order to provide base station to send CSI-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 kind of channel state information reference signals sending method, the method comprising the steps of: for each community, in RE that comprise at each Physical Resource Block PRB of multimedia broadcasting single frequency network MBSFN subframe respectively, except the Resource Unit RE of carrying physical downlink control channel PDCCH, public reference signal CRS and demodulated reference signal DM-RS, determine the RE of Bearer Channel state information reference signals CSI-RS; Need to send to the CSI-RS of this community to be mapped in the RE determining; Described MBSFN subframe is sent to the user terminal in each community.
A kind of channel state information reference signals dispensing device, comprise: determining unit, be used for for each community, in RE that comprise at each Physical Resource Block PRB of multimedia broadcasting single frequency network MBSFN subframe, except the Resource Unit RE of carrying physical downlink control channel PDCCH, public reference signal CRS and demodulated reference signal DM-RS, determine the RE of Bearer Channel state information reference signals CSI-RS; Map unit, for sending to the CSI-RS of this community to be mapped to the RE that determining unit is determined; Transmitting element, for sending to the MBSFN subframe after map unit mapping the user terminal of each community.
A kind of channel state information reference signals method of reseptance, 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, respectively for self community, place, in RE that comprise at this PRB, except the Resource Unit RE of carrying physical downlink control channel PDCCH, public reference signal CRS and demodulated reference signal DM-RS, determine the RE of Bearer Channel state information reference signals CSI-RS; From the RE determining, receive CSI-RS.
A kind of channel state information reference signals receiving system, comprise: determining unit, the each Physical Resource Block PRB comprising for the multimedia broadcasting single frequency network MBSFN subframe sending in base station, respectively for community, place, in RE that comprise at this PRB, except the Resource Unit RE of carrying physical downlink control channel PDCCH, public reference signal CRS and demodulated reference signal DM-RS, determine the RE of Bearer Channel state information reference signals CSI-RS; Receiving element, receives CSI-RS for the RE determining from determining unit.
In embodiment of the present invention technical scheme, for each community, comprise at each PRB of MBSFN, except carrying PDCCH, in RE outside the RE of CRS and DM-RS, determine the RE of carrying CSI-RS, then need to send to the CSI-RS of this community to be mapped in the RE determining, this MBSFN subframe is sent to the user terminal in each community, thereby realize the scheme that sends CSI-RS in MBSFN subframe, owing to carrying PDCCH based on removing, RE carrying CSI-RS outside the RE of CRS and DM-RS, therefore just avoided PDCCH, CRS and DM-RS produce and disturb CSI-RS.
Accompanying drawing explanation
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, channel state information reference signals sending method schematic flow sheet;
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, CRS and DM-RS;
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, CRS and DM-RS;
Fig. 4 A～Fig. 4 I is in the embodiment of the present invention, for the MBSFN subframe that adopts Normal CP, and the CSI-RS Pattern schematic diagram of CSI-RS port number while being 2;
Fig. 5 A～Fig. 5 C is in the embodiment of the present invention, for the MBSFN subframe that adopts Extended CP, and the CSI-RS Pattern schematic diagram of CSI-RS port number while being 2;
Fig. 6 A～Fig. 6 H is in the embodiment of the present invention, for the MBSFN subframe that adopts Normal CP, and the CSI-RS Pattern schematic diagram of CSI-RS port number while being 4;
Fig. 7 A～Fig. 7 D is in the embodiment of the present invention, for the MBSFN subframe that adopts Extended CP, and the CSI-RS Pattern schematic diagram of CSI-RS port number while being 4;
Fig. 8 A～Fig. 8 J is in the embodiment of the present invention, for the MBSFN subframe that adopts Normal CP, and the CSI-RS Pattern schematic diagram of CSI-RS port number while being 8;
Fig. 9 A～Fig. 9 D is in the embodiment of the present invention, for the MBSFN subframe that adopts Extended CP, and the CSI-RS Pattern schematic diagram of CSI-RS port number while being 8;
Figure 10 A～Figure 10 K is in the embodiment of the present invention, and the multiplexing factor is 3 o'clock, sends the PRB schematic diagram of CSI-RS in MBSFN subframe;
Figure 11 is in the embodiment of the present invention, and the multiplexing factor is 4 o'clock, sends the PRB schematic diagram of CSI-RS in MBSFN subframe;
Figure 12 is in the embodiment of the present invention, and the multiplexing factor is 5 o'clock, sends the PRB schematic diagram of CSI-RS in MBSFN subframe;
Figure 13 A～13C is in the embodiment of the present invention, sends the schematic diagram of the PRB that two frequency domains of CSI-RS are adjacent in MBSFN subframe;
Figure 14 is in the embodiment of the present invention, channel state information reference signals dispensing device structural representation;
Figure 15 is in the embodiment of the present invention, channel state information reference signals method of reseptance schematic flow sheet;
Figure 16 is in the embodiment of the present invention, channel state information reference signals receiving system structural representation.
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 CSI-RS to user terminal, can send CSI-RS based on 2 CSI-RS ports, the data flow of now transmitting between base station and user terminal is 2 data flow, also can send CSI-RS based on 4 CSI-RS ports, the data flow of now transmitting between base station and user terminal is 4 data flow, can also send CSI-RS based on 8 CSI-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 CSI-RS ports, 4 CSI-RS ports and 8 CSI-RS port transmission CSI-RS is made as: 1RE and port and PRB, that is to say on each PRB, each DM-RS port only takies 1 RE and sends CSI-RS.
As shown in Figure 2, be CSI-RS sending method flow chart in the embodiment of the present invention, its concrete processing procedure is as follows:
Step 21, for each community, in RE outside the RE comprising, remove carrying Physical Downlink Control Channel (PDCCH, Physical Downlink Control Channel), CRS and DM-RS, determine the RE of carrying CSI-RS in each PRB of MBSFN subframe to be sent;
If the each user terminal of base station in MBSFN subframe Zhong Xiangge community sends CSI-RS, can in the each PRB in this MBSFN subframe, issue, wherein in each PRB, all carry the CSI-RS issuing to multiple communities, not overlapping to the RE that the CSI-RS of each community transmission is shared, be that multiple communities are realized multiplexing in each PRB, the CSI-RS now sending to multiple communities does not interfere with each other, if the multiplexing factor is 3, in each PRB of MBSFN subframe, the shared RE of CSI-RS that Xiang Sange community sends does not have overlapping completely, the CSI-RS pattern (Pattern) that the shared RE of CSI-RS sending to each community forms is mutually orthogonal.
In the PRB of MBSFN subframe, the first two OFDM symbol is used for transmitting PDCCH and CRS, for fear of PDCCH, CRS and DM-RS, CSI-RS is produced and disturbed, in RE that the embodiment of the present invention proposes to comprise at each PRB, except the RE of carrying PDCCH, CRS and DM-RS, determine the RE of carrying CSI-RS.
Wherein for the MBSFN subframe that adopts Normal CP, DM-RS can be, but not limited to take the 3rd that is arranged in order by the order after arriving first according to the time, the 4th, on 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 2nd, the 6th, the 7th, the 11st and the 12nd subcarrier, now CSI-RS can take the 3rd, the 4th, on the 13rd and the 14th OFDM symbol, do not carry the subcarrier of DM-RS, the 3rd, the 4th, on the 13rd and the 14th OFDM symbol the 3rd, the 4th, the 5th, the 8th, the 9th or the 10th subcarrier, CSI-RS can also take the 5th, the 6th, the 7th, the 8th, the 9th, the 10th, norator carrier wave on the 11st and the 12nd OFDM symbol, for the MBSFN subframe that adopts Extended CP, DM-RS can be, but not limited to take several subcarriers on the 3rd, the 4th, the 11st and the 12nd OFDM symbol, now CSI-RS can take subcarrier on the 3rd, the 4th, the 11st and the 12nd OFDM symbol, that do not carry DM-RS, and CSI-RS can also take the norator carrier wave on the 5th, the 6th, the 7th, the 8th, the 9th, the 10th, the 11st and the 12nd OFDM symbol.
Fig. 3 A sends PDCCH in the MBSFN subframe that adopts Normal CP, the PRB schematic diagram of CRS and DM-RS, Fig. 3 B sends PDCCH in the MBSFN subframe that adopts Extended CP, the PRB schematic diagram of CRS and DM-RS, because uncertain DM-RS takies the 3rd, the 4th, which subcarrier on the 11st and the 12nd OFDM symbol, therefore in Fig. 3 B by the 3rd, the 4th, all subcarriers on the 11st and the 12nd OFDM symbol are all designated the subcarrier of carrying DM-RS, DM-RS may only take the 3rd in fact, the 4th, some subcarriers on the 11st and the 12nd OFDM symbol, rather than whole subcarriers.
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 CSI-RS (choosing in subcarrier also can be in Fig. 3 B on the 3rd, the 4th, the 11st and the 12nd OFDM symbol, that do not carry DM-RS).
Step 22, need to send to the CSI-RS of this community to be mapped in the RE determining;
Step 23, sends to the user terminal in each community by described MBSFN subframe.
Introduce in detail the RE of how to confirm carrying CSI-RS below.
There are multiple CSI-RS ports base station for sending CSI-RS, in advance CSI-RS port is divided into at least one CSI-RS port set, the quantity of the CSI-RS port that each CSI-RS port set comprises is 2, if the quantity of CSI-RS port is 2, all CSI-RS ports are divided into a CSI-RS port set, if the quantity of CSI-RS port is 4, all CSI-RS ports are on average divided into two CSI-RS port set, if the quantity of CSI-RS port is 8, all CSI-RS ports are on average divided into 4 CSI-RS port set.
For each CSI-RS port, comprise at each PRB of MBSFN subframe, except carrying PDCCH, in RE outside the RE of CRS and DM-RS, determine the RE of carrying CSI-RS, wherein, the RE determining for the each CSI-RS port in same CSI-RS port set is identical, the RE difference of determining for the CSI-RS port in different CSI-RS port set, that is to say that the each CSI-RS port in same CSI-RS port set takies identical RE transmission CSI-RS, and each CSI-RS port in different CSI-RS port set takies different RE and sends CSI-RS, therefore the CSI-RS that the each CSI-RS port in different CSI-RS port set sends adopts frequency division multiplexing (FDM, Frequency-DivisionMultiplexing) mode is distinguished.
The concrete mode of determining the RE of carrying CSI-RS for each CSI-RS port can be, but not limited to as follows:
For each CSI-RS port, first comprise at each PRB of MBSFN subframe, in OFDM symbol except the OFDM symbol of carrying PDCCH and CRS, select 1 or 2 OFDM symbols, can be, but not limited to realize by following manner, each PRB of MBSFN subframe is comprised, OFDM symbol combination except the OFDM symbol of carrying PDCCH and CRS is several OFDM symbols, each OFDM symbols comprises 1 OFDM symbol or 2 OFDM symbols, if comprise two OFDM symbols, these two OFDM symbols can be adjacent, also can be non-conterminous, in the OFDM symbols being combined into, select an OFDM symbols, comprise at the OFDM symbol of selecting, in RE except the RE of carrying DM-RS, every two adjacent RE of subcarrier on every two RE in same sub-carrier or identical OFDM symbol are combined as to a RE couple, the RE centering being combined into, select at least one RE couple, by each RE of each RE centering of selecting, be defined as carrying the RE of CSI-RS, if wherein each OFDM symbols comprises 2 adjacent OFDM symbols, preferably, every two RE adjacent OFDM symbol in same sub-carrier can be combined as to a RE couple.
For the MBSFN subframe that adopts Normal CP, if comprise an OFDM symbol in each OFDM symbols, can be combined as 12 OFDM symbols; For the MBSFN subframe that adopts Extended CP, if comprise an OFDM symbol in each OFDM symbols, can be combined as 10 OFDM symbols.
For with common subframe in CSI-RS Pattern be consistent, the embodiment of the present invention is established each CSI-RS port in the time sending CSI-RS, take 2 RE on a PRB, two RE that one of them CSI-RS port takies can be two adjacent or non-conterminous subcarriers on same OFDM symbol, also can be the same subcarrier on two adjacent or non-conterminous OFDM symbols, in addition all right corresponding different OFDM symbol of two RE that, CSI-RS port takies and different subcarriers.Therefore, can be, but not limited to select an OFDM symbols in the OFDM symbols being combined into, if comprise an OFDM symbol in the OFDM symbols of combination, select an OFDM symbol, if comprise two adjacent OFDM symbols in the OFDM symbols of combination, two adjacent OFDM symbols are selected, in addition, can be, but not limited to select a RE couple the RE centering being combined into, if selected an OFDM symbol, the RE pair of the RE selecting to the adjacent RE composition of two subcarriers on the OFDM symbol for selecting, if selected two adjacent OFDM symbols, the RE pair of the RE selecting to the adjacent RE composition of two OFDM symbols in same sub-carrier.
In order to distinguish the CSI-RS of the each CSI-RS port transmission in same CSI-RS port set, the embodiment of the present invention proposes to adopt code division multiplexing (CDM, Code-Division Multiplexing) mode distinguish, for distributing respectively an orthogonal intersection (OCC for the each CSI-RS port in each CSI-RS port set, Orthogonal Cover Code), wherein owing to comprising two CSI-RS ports in each CSI-RS port set, therefore the length of the OCC distributing is 2, for the each CSI-RS port in each CSI-RS port set, according to the OCC distributing, the CSI-RS respectively RE of each RE centering of selecting for this CSI-RS port being carried sends to the user terminal in each community, wherein, in the time that two RE of RE centering are the adjacent RE of two subcarriers on same OFDM symbol, for the CDM on frequency domain, in the time that two RE of RE centering are the adjacent RE of two OFDM symbols on same subcarrier, for the CDM in time domain.
For example, CSI-RS port 0 and a CSI-RS port set of CSI-RS port one composition, wherein CSI-RS port 0 and CSI-RS port one take identical RE and send CSI-RS, the OCC distributing for CSI-RS port 0 is (1,-1), the OCC distributing for CSI-RS port one is (1, 1), the RE selecting for CSI-RS port 0 and CSI-RS port one is to being the 12nd RE couple that subcarrier forms on the 5th and the 6th OFDM symbol, CSI-RS port 0 is according to (1,-1), the CSI-RS that the RE of this RE centering is carried sends to user terminal, CSI-RS port one is according to (1, 1), the CSI-RS that the RE of this RE centering is carried sends to user terminal.
In order to utilize as far as possible larger power to send CSI-RS, the embodiment of the present invention proposes, in the time adopting CDM on frequency domain to distinguish the CSI-RS that the each CSI-RS port in same CSI-RS port set sends, for the each CSI-RS port in any CSI-RS port set, the RE selecting in two adjacent PRB of frequency domain is respectively to corresponding OFDM symbol difference, for example, CSI-RS port one takies the 11st and the 12nd subcarrier transmission CSI-RS on the 5th OFDM symbol in PRB1, CSI-RS port one takies the 11st and the 12nd subcarrier transmission CSI-RS on the 6th OFDM symbol in PRB2, wherein PRB1 and PRB2 are two PRB adjacent on frequency domain, when PRB1 sends CSI-RS on the 5th OFDM symbol like this, because its PRB2 sends CSI-RS on the 6th OFDM symbol, therefore PRB1 can use the transmitted power of PRB2 on the 5th OFDM symbol, and then the power that each PRB is used try one's best large sends CSI-RS.For example, can make two CSI-RS port set on two frequency domains, in adjacent PRB, alternately send each other the OFDM character position of CSI-RS.
In addition, in order to reduce the interference between the CSI-RS of neighbor cell, neighbor cell should be avoided taking identical RE as far as possible and send CSI-RS, on identical OFDM symbol, neighbor cell should take different subcarriers as far as possible and send CSI-RS, or in same sub-carrier, neighbor cell should take different OFDM symbols as far as possible and send CSI-RS, the RE selecting respectively for neighbor cell is to non-overlapping copies, for the ease of networking, should make the multiplexing factor of CSI-RS Pattern as far as possible large, conventionally, this multiplexing factor is not less than 3.
The various CSI-RS Pattern that below embodiment of the present invention proposed describe in detail.
The first situation: MBSFN subframe adopts Normal CP, and CSI-RS port number is 2 (CSI-RS port 0 and CSI-RS port ones):
Because the first two OFDM symbol is used for passing PDCCH and CRS, if in the 3rd, the 4th, the 13rd and the 14th OFDM symbol the 1st, the 2nd, the 6th, the 7th, the 11st and the 12nd subcarrier are used for transmitting DM-RS, the RE that transmits CSI-RS need to choose from remaining RE.
If in advance by synthetic the 3rd～the 14th OFDM symbols several OFDM symbols, in each OFDM symbols, comprise 1 OFDM symbol, select one of them OFDM symbols, can be as shown in Figure 4 A, select the 3rd OFDM symbol, as shown in Figure 4 B, select the 4th OFDM symbol, as shown in Figure 4 C, select the 5th OFDM symbol, as shown in Figure 4 D, select the 6th OFDM symbol, as shown in Figure 4 E, select the 13rd OFDM symbol, as shown in Fig. 4 F, select the 14th OFDM symbol, by select OFDM symbol in, RE except the RE of carrying DM-RS is combined as several RE couple, the subcarrier of the RE of each RE centering is adjacent, select a RE to carrying CSI-RS the RE centering being combined into, CSI-RS Pattern now can be, but not limited to as shown in Fig. 4 A～4F.
In Fig. 4 A, any two adjacent sub-carriers that can choose on the 3rd OFDM symbol the 3rd, the 4th, the 5th, the 8th, the 9th and the 10th subcarrier carry CSI-RS;
In Fig. 4 B, any two adjacent sub-carriers that can choose on the 4th OFDM symbol the 3rd, the 4th, the 5th, the 8th, the 9th and the 10th subcarrier carry CSI-RS;
In Fig. 4 C, can choose the 5th any one RE on OFDM symbol to carrying CSI-RS;
In Fig. 4 D, can choose the 6th any one RE on OFDM symbol to carrying CSI-RS;
In Fig. 4 E, any two adjacent sub-carriers that can choose on the 13rd OFDM symbol the 3rd, the 4th, the 5th, the 8th, the 9th and the 10th subcarrier carry CSI-RS;
In Fig. 4 F, any two adjacent sub-carriers that can choose on the 14th OFDM symbol the 3rd, the 4th, the 5th, the 8th, the 9th and the 10th subcarrier carry CSI-RS.
If in advance by synthetic the 3rd～the 14th OFDM symbols several OFDM symbols, in each OFDM symbols, comprise two adjacent OFDM symbols, select one of them OFDM symbols, can be as shown in Figure 4 G, select the OFDM symbols of the 3rd OFDM symbol and the 4th OFDM symbol composition, as shown in Fig. 4 H, select the OFDM symbols of the 5th OFDM symbol and the 6th OFDM symbol composition, as shown in Fig. 4 I, select the OFDM symbols of the 13rd OFDM symbol and the 14th OFDM symbol composition, by select OFDM symbol in, RE except the RE of carrying DM-RS is combined as several RE couple, the subcarrier of the RE of each RE centering is identical, select a RE to carrying CSI-RS the RE centering being combined into, CSI-RS Pattern now can be, but not limited to as shown in Fig. 4 G～4I.
In Fig. 4 G, can choose any one RE on the 3rd OFDM symbol and the 4th OFDM symbol, that do not carry DM-RS to carrying CSI-RS, the subcarrier of the RE of each RE centering is identical;
In Fig. 4 H, can choose any one RE on the 5th OFDM symbol and the 6th OFDM symbol to carrying CSI-RS, the subcarrier of the RE of each RE centering is identical;
In Fig. 4 I, can choose any one RE on the 13rd OFDM symbol and the 14th OFDM symbol, that do not carry DM-RS to carrying CSI-RS, the subcarrier of the RE of each RE centering is identical.
The second situation, MBSFN subframe adopts Extended CP, and CSI-RS port number is 2 (CSI-RS port 0 and CSI-RS port ones):
CSI-RS Pattern now can be, but not limited to as shown in Fig. 5 A～5C.
In addition, CSI-RS also can take the subcarrier that does not carry DM-RS on the 3rd, the 4th, the 11st and the 12nd OFDM symbol.
The third situation, MBSFN subframe adopts Normal CP, and CSI-RS port number is 4 (CSI-RS port 0 and CSI-RS port one composition the one CSI-RS port set, CSI-RS port 2 and CSI-RS port 3 form the 2nd CSI-RS port set):
If in advance by synthetic the 3rd～the 14th OFDM symbols several OFDM symbols, in each OFDM symbols, comprise 1 OFDM symbol, select one of them OFDM symbols, can be as shown in Figure 6A, select the 5th OFDM symbol, as shown in Figure 6B, select the 6th OFDM symbol, RE in the OFDM symbol of selection is combined as to several RE couple, the subcarrier of the RE of each RE centering is adjacent, select two RE to carrying CSI-RS the RE centering being combined into, CSI-RS Pattern now can be, but not limited to as shown in Fig. 6 A～6B.
In Fig. 6 A, can choose any two RE on the 5th OFDM symbol to carrying CSI-RS;
In Fig. 6 B, can choose any two RE on the 6th OFDM symbol to carrying CSI-RS.
If in advance by synthetic the 3rd～the 14th OFDM symbols several OFDM symbols, in each OFDM symbols, comprise two adjacent OFDM symbols, select one of them OFDM symbols, can be as shown in Figure 6 C, select the OFDM symbols of the 3rd OFDM symbol and the 4th OFDM symbol composition, as shown in Figure 6 D, select the OFDM symbols of the 5th OFDM symbol and the 6th OFDM symbol composition, as shown in Fig. 6 E, select the OFDM symbols of the 13rd OFDM symbol and the 14th OFDM symbol composition, by select OFDM symbol in, RE except the RE of carrying DM-RS is combined as several RE couple, the subcarrier of the RE of each RE centering is identical, select two RE to carrying CSI-RS the RE centering being combined into, CSI-RS Pattern now can be, but not limited to as shown in Fig. 6 C～6D.
In Fig. 6 C, can choose any two RE on the 3rd OFDM symbol and the 4th OFDM symbol, that do not carry DM-RS to carrying CSI-RS, the subcarrier of two RE of each RE centering is identical;
In Fig. 6 D, can choose any two RE on the 5th OFDM symbol and the 6th OFDM symbol to carrying CSI-RS, the subcarrier of two RE of each RE centering is identical;
In Fig. 6 E, can choose any two RE on the 13rd OFDM symbol and the 14th OFDM symbol to carrying CSI-RS, the subcarrier of two RE of each RE centering is identical.
If in advance by synthetic the 3rd～the 14th OFDM symbols several OFDM symbols, in each OFDM symbols, comprise two adjacent OFDM symbols, select one of them OFDM symbols, can be as shown in Fig. 6 F, select the OFDM symbols of the 3rd OFDM symbol and the 4th OFDM symbol composition, as shown in Figure 6 G, select the OFDM symbols of the 5th OFDM symbol and the 6th OFDM symbol composition, as shown in Fig. 6 H, select the OFDM symbols of the 13rd OFDM symbol and the 14th OFDM symbol composition, by select OFDM symbol in, RE except the RE of carrying DM-RS is combined as several RE couple, the OFDM symbol of the RE of each RE centering is identical, select two RE to carrying CSI-RS the RE centering being combined into, CSI-RS Pattern now can be, but not limited to as shown in Fig. 6 F～6H.
In Fig. 6 F, can choose any two RE on the 3rd OFDM symbol and the 4th OFDM symbol, that do not carry DM-RS to carrying CSI-RS, the OFDM symbol of two RE of each RE centering is identical;
In Fig. 6 G, can choose any two RE on the 5th OFDM symbol and the 6th OFDM symbol to carrying CSI-RS, the OFDM symbol of two RE of each RE centering is identical;
In Fig. 6 H, can choose any two RE on the 13rd OFDM symbol and the 14th OFDM symbol, that do not carry DM-RS to carrying CSI-RS, the OFDM symbol of two RE of each RE centering is identical.
The 4th kind of situation, MBSFN subframe adopts Extended CP, and CSI-RS port number is 4 (CSI-RS port 0 and CSI-RS port one composition the one CSI-RS port set, CSI-RS port 2 and CSI-RS port 3 form the 2nd CSI-RS port set):
CSI-RS Pattern now can be, but not limited to as shown in Fig. 7 A～7D.
In addition, CSI-RS also can take the subcarrier that does not carry DM-RS on the 3rd, the 4th, the 11st and the 12nd OFDM symbol.
The 5th kind of situation, MBSFN subframe adopts Normal CP, CSI-RS port number is 8 (CSI-RS port 0 and CSI-RS port one composition the one CSI-RS port set, CSI-RS port 2 and CSI-RS port 3 form the 2nd CSI-RS port set, CSI-RS port 4 and CSI-RS port 5 form the 3rd CSI-RS port set, and CSI-RS port 6 and CSI-RS port 7 form the 4th CSI-RS port set):
If in advance by synthetic the 3rd～the 14th OFDM symbols several OFDM symbols, in each OFDM symbols, comprise 1 OFDM symbol, select one of them OFDM symbols, can be, but not limited to as shown in Figure 8 A, select the 5th OFDM symbol, RE in the OFDM symbol of selection is combined as to several RE couple, the subcarrier of the RE of each RE centering is adjacent, select four RE to carrying CSI-RS the RE centering being combined into, CSI-RS Pattern now can be, but not limited to as shown in Figure 8 A, in Fig. 8 A, can choose any four RE on the 5th OFDM symbol to carrying CSI-RS.
If in advance by synthetic the 3rd～the 14th OFDM symbols several OFDM symbols, in each OFDM symbols, comprise two adjacent OFDM symbols, select one of them OFDM symbols, can be as shown in Figure 8 B, select the OFDM symbols of the 3rd OFDM symbol and the 4th OFDM symbol composition, as shown in Fig. 8 C～Fig. 8 E, select the OFDM symbols of the 5th OFDM symbol and the 6th OFDM symbol composition, as shown in Figure 8 F, select the OFDM symbols of the 13rd OFDM symbol and the 14th OFDM symbol composition, by select OFDM symbol in, RE except the RE of carrying DM-RS is combined as several RE couple, the subcarrier of the RE of each RE centering is identical, select four RE to carrying CSI-RS the RE centering being combined into, CSI-RS Pattern now can be, but not limited to as shown in Fig. 8 B～8F.
In Fig. 8 B, can choose any four RE on the 3rd OFDM symbol and the 4th OFDM symbol, that do not carry DM-RS to carrying CSI-RS, the subcarrier of two RE of each RE centering is identical;
In Fig. 8 C～Fig. 8 E, can choose any four RE on the 5th OFDM symbol and the 6th OFDM symbol to carrying CSI-RS, the subcarrier of two RE of each RE centering is identical;
In Fig. 8 F, can choose any four RE on the 13rd OFDM symbol and the 14th OFDM symbol, that do not carry DM-RS to carrying CSI-RS, the subcarrier of two RE of each RE centering is identical.
If in advance by synthetic the 3rd～the 14th OFDM symbols several OFDM symbols, in each OFDM symbols, comprise two adjacent OFDM symbols, select one of them OFDM symbols, can be as shown in Fig. 8 G, select the OFDM symbols of the 3rd OFDM symbol and the 4th OFDM symbol composition, as shown in Fig. 8 H～Fig. 8 I, select the OFDM symbols of the 5th OFDM symbol and the 6th OFDM symbol composition, as shown in Fig. 8 J, select the OFDM symbols of the 13rd OFDM symbol and the 14th OFDM symbol composition, by select OFDM symbol in, RE except the RE of carrying DM-RS is combined as several RE couple, the OFDM symbol of the RE of each RE centering is identical, select four RE to carrying CSI-RS the RE centering being combined into, CSI-RS Pattern now can be, but not limited to as shown in Fig. 8 G～8J.
In Fig. 8 G, can choose any four RE on the 3rd OFDM symbol and the 4th OFDM symbol, that do not carry DM-RS to carrying CSI-RS, the OFDM symbol of two RE of each RE centering is identical;
In Fig. 8 H～Fig. 8 I, can choose any four RE on the 5th OFDM symbol and the 6th OFDM symbol to carrying CSI-RS, the OFDM symbol of two RE of each RE centering is identical;
In Fig. 8 J, can choose any four RE on the 13rd OFDM symbol and the 14th OFDM symbol, that do not carry DM-RS to carrying CSI-RS, the OFDM symbol of two RE of each RE centering is identical.
The 6th kind of situation, MBSFN subframe adopts Extended CP, CSI-RS port number is 8 (CSI-RS port 0 and CSI-RS port one composition the one CSI-RS port set, CSI-RS port 2 and CSI-RS port 3 form the 2nd CSI-RS port set, CSI-RS port 4 and CSI-RS port 5 form the 3rd CSI-RS port set, and CSI-RS port 6 and CSI-RS port 7 form the 4th CSI-RS port set):
CSI-RS Pattern now can be, but not limited to as shown in Fig. 9 A～9D.
In addition, CSI-RS also can take the subcarrier that does not carry DM-RS in the 3rd, the 4th, the 11st and the 12nd OFDM symbol.
Suppose that the multiplexing factor is 3, in each PRB, the RE non-overlapping copies that the CSI-RS sending to 1～community, community 3 takies respectively, as shown in Figure 10 A～10K, for send the PRB schematic diagram of CSI-RS in MBSFN subframe.
Suppose that the multiplexing factor is 4, in each PRB, the RE non-overlapping copies that the CSI-RS sending to 1～community, community 4 takies respectively, as shown in figure 11, for send the PRB schematic diagram of CSI-RS in the MBSFN subframe that adopts Normal CP.
Suppose that the multiplexing factor is 5, in each PRB, the RE non-overlapping copies that the CSI-RS sending to 1～community, community 5 takies respectively, as shown in figure 12, for send the PRB schematic diagram of CSI-RS in the MBSFN subframe that adopts Normal CP.
In order to utilize as far as possible larger power to send CSI-RS, the embodiment of the present invention proposes to make two CSI-RS port set on two frequency domains, in adjacent PRB, alternately to send each other the OFDM character position of CSI-RS.As shown in Figure 13 A～Figure 13 C, for send the schematic diagram of the PRB that two frequency domains of CSI-RS are adjacent in MBSFN subframe.
In above-mentioned Fig. 4 A～Figure 13 C, the CSI-RS port in each CSI-RS port set can exchange, and each CSI-RS port can carry out combination in any.In addition; the CSI-RS Pattern that CSI-RS Pattern shown in Fig. 4 A～Figure 13 C 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 CSI-RSPattern 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, for each community, comprise at each PRB of MBSFN, except carrying PDCCH, in RE outside the RE of CRS and DM-RS, determine the RE of carrying CSI-RS, then need to send to the CSI-RS of this community to be mapped in the RE determining, this MBSFN subframe is sent to the user terminal in each community, thereby realize the scheme that sends CSI-RS in MBSFN subframe, owing to carrying PDCCH based on removing, RE carrying CSI-RS outside the RE of CRS and DM-RS, therefore just avoided PDCCH, CRS and DM-RS produce and disturb CSI-RS.
Accordingly, the embodiment of the present invention provides a kind of channel state information reference signals dispensing device, as shown in figure 14, comprises determining unit 141, map unit 142 and transmitting element 143, wherein:
Determining unit 141, for for each community, in RE that comprise at each PRB of MBSFN subframe, except the RE of carrying PDCCH, CRS and DM-RS, determines the RE of carrying CSI-RS;
Map unit 142, for sending to the CSI-RS of this community to be mapped to the RE that determining unit 141 is determined;
Transmitting element 143, sends to the user terminal of each community for the MBSFN subframe after map unit 142 is shone upon.
Preferably, determining unit 141 specifically comprises divides subelement and definite subelement, wherein:
Divide subelement, for the CSI-RS port that sends CSI-RS is divided into at least one CSI-RS port set, the quantity of the CSI-RS port comprising in each CSI-RS port set is 2;
Determine subelement, be used for for each CSI-RS port, in RE that comprise at each PRB of MBSFN subframe, except the RE of carrying PDCCH, CRS and DM-RS, determine the RE of carrying CSI-RS, wherein, the RE determining for the each CSI-RS port in same CSI-RS port set is identical, the RE difference of determining for the CSI-RS port in different CSI-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 CSI-RS port, in OFDM symbol that comprise at each PRB of MBSFN subframe, except the OFDM symbol of carrying PDCCH and CRS, selects 1 or 2 OFDM symbols;
Composite module, RE that comprise for the OFDM symbol of selecting in the first selection module, except the RE of carrying DM-RS, is combined as a RE couple by every two the adjacent RE of subcarrier on every two RE in same sub-carrier or identical OFDM symbol;
Second selects module, for the RE centering being combined into, selects at least one RE couple;
Determination module, for each RE of each RE centering that the second selection module is selected, is defined as carrying the RE of CSI-RS.
More preferably, transmitting element 143 specifically comprises distribution subelement and transmission subelement, wherein:
Distribute subelement, be used to the each CSI-RS port in each CSI-RS port set to distribute respectively an OCC, the length of the OCC wherein distributing is 2;
Send subelement, for the each CSI-RS port for each CSI-RS port set, according to the OCC that distributes subelement to distribute, the CSI-RS that each RE of each RE centering is carried sends to the user terminal in each community respectively.
Two RE of each RE centering that preferably, composite module is combined into are two RE that subcarrier is adjacent on identical OFDM symbol;
For the each CSI-RS port in any CSI-RS port set, the RE that the second selection module is selected respectively in two adjacent PRB of frequency domain is to corresponding OFDM symbol difference.
Preferably, the RE that the second selection module is selected respectively for the neighbor cell of defined amount is to non-overlapping copies.
The embodiment of the present invention also provides a kind of base station, comprises above-mentioned channel state information reference signals dispensing device, and wherein channel state information reference signals dispensing device can be, but not limited to be placed in base station.
Corresponding with above-mentioned channel state information reference signals sending method, the embodiment of the present invention has also proposed a kind of channel state information reference signals method of reseptance, and as shown in figure 15, its concrete processing procedure is as follows:
Step 151, in each PRB that the MBSFN subframe that user terminal sends in base station comprises, respectively for self community, place, in RE that comprise at this PRB, except the RE of carrying PDCCH, CRS and DM-RS, determines the RE of carrying CSI-RS;
Step 152 receives CSI-RS from the RE determining.
Wherein, in RE that comprise at this PRB, except the RE of carrying PDCCH, CRS and DM-RS, determine the RE of carrying CSI-RS, specifically comprise the steps:
First the CSI-RS port that sends CSI-RS is divided into at least one CSI-RS port set, the quantity of the CSI-RS port comprising in each CSI-RS port set is 2, then for each CSI-RS port, in RE that this PRB sending at this CSI-RS port comprises, except the RE of carrying PDCCH, CRS and DM-RS, determine the RE of carrying CSI-RS, wherein, the RE determining for the each CSI-RS port in same CSI-RS port set is identical, the RE difference of determining for the CSI-RS port in different CSI-RS port set.
In said process, determine the RE of carrying CSI-RS for each CSI-RS port, specifically comprise the steps:
For each CSI-RS port, in OFDM symbol that comprise at this PRB, except the OFDM symbol of carrying PDCCH and CRS, select 1 or 2 OFDM symbols, in RE that comprise at the OFDM symbol of selecting, except the RE of carrying DM-RS, every two adjacent RE of subcarrier on every two RE in same sub-carrier or identical OFDM symbol are combined as to a RE couple, the RE centering being combined into, select at least one RE couple, by each RE of each RE centering of selecting, be defined as carrying the RE of CSI-RS.
From the RE determining, receive CSI-RS, specifically comprise the steps:
Be defined as the OCC that the each CSI-RS port in each CSI-RS port set distributes respectively, the length of the OCC wherein distributing is 2, then for the each CSI-RS port in each CSI-RS port set, according to the OCC determining, from the right each RE of each RE, receive CSI-RS respectively.
In the embodiment of the present invention, two RE of the each RE centering being combined into are two RE that subcarrier is adjacent on identical OFDM symbol, now, for the each CSI-RS port in any CSI-RS port set, the RE selecting in two adjacent PRB of frequency domain is respectively to corresponding OFDM symbol difference.
In addition the RE selecting respectively for the neighbor cell of defined amount, is to non-overlapping copies.
The embodiment of the present invention provides a kind of channel state information reference signals receiving system, as shown in figure 16, comprises determining unit 161 and receiving element 162, wherein:
Determining unit 161, the each PRB comprising for the MBSFN subframe sending in base station, respectively for community, place, in RE that comprise at this PRB, except the RE of carrying PDCCH, CRS and DM-RS, determines the RE of carrying CSI-RS;
Receiving element 162, receives CSI-RS for the RE determining from determining unit 161.
Preferably, determining unit 161 specifically comprises that dividing subelement and first determines subelement, wherein:
Divide subelement, for the CSI-RS port that sends CSI-RS is divided into at least one CSI-RS port set, the quantity of the CSI-RS port comprising in each CSI-RS port set is 2;
First determines subelement, be used for for each CSI-RS port, in RE that this PRB sending at this CSI-RS port comprises, except the RE of carrying PDCCH, CRS and DM-RS, determine the RE of carrying CSI-RS, wherein, the RE determining for the each CSI-RS port in same CSI-RS port set is identical, the RE difference of determining for the CSI-RS port in different CSI-RS port set.
More preferably, first determines that subelement specifically comprises the first selection module, composite module, the second selection module and determination module:
First selects module, for for each CSI-RS port, in OFDM symbol that comprise at this PRB, except the OFDM symbol of carrying PDCCH and CRS, selects 1 or 2 OFDM symbols;
Composite module, RE that comprise for the OFDM symbol of selecting in the first selection module, except the RE of carrying DM-RS, is combined as a RE couple by every two the adjacent RE of subcarrier on every two RE in same sub-carrier or identical OFDM symbol;
Second selects module, for the RE centering being combined at composite module, selects at least one RE couple;
Determination module, for each RE of each RE centering that the second selection module is selected, is defined as carrying the RE of CSI-RS.
More preferably, receiving element 162 specifically comprises that second determines subelement and receive subelement, wherein:
Second determines subelement, the OCC distributing respectively for being defined as each CSI-RS port of each CSI-RS port set, and the length of the OCC wherein distributing is 2;
Receive subelement, for the each CSI-RS port for each CSI-RS port set, determine according to second the OCC that subelement is determined respectively, from the right each RE of each RE, receive CSI-RS.
Two RE of each RE centering that preferably, composite module is combined into are two RE that subcarrier is adjacent on identical OFDM symbol;
For the each CSI-RS port in any CSI-RS port set, the RE that the second selection module is selected respectively in two adjacent PRB of frequency domain is to corresponding OFDM symbol difference.
Preferably, the RE that the second selection module is selected respectively for the neighbor cell of defined amount is to non-overlapping copies.
The embodiment of the present invention also provides a kind of user terminal, comprises above-mentioned channel state information reference signals receiving system, and wherein channel state information reference signals receiving system 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 within of the present invention these are revised and 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 (26)

1.一种信道状态信息参考信号发送方法，其特征在于，包括：1. A channel state information reference signal sending method, characterized in that, comprising: 针对每个小区，分别在多媒体广播单频网MBSFN子帧的每个物理资源块PRB包含的、除承载物理下行控制信道PDCCH、公共参考信号CRS和解调参考信号DM-RS的资源单元RE之外的RE中，确定承载信道状态信息参考信号CSI-RS的RE；For each cell, each physical resource block PRB included in the multimedia broadcast single frequency network MBSFN subframe, except the resource element RE carrying the physical downlink control channel PDCCH, common reference signal CRS and demodulation reference signal DM-RS Out of the REs, determine the RE that bears the channel state information reference signal CSI-RS; 将需要发送给该小区的CSI-RS映射到确定出的RE中；Mapping the CSI-RS that needs to be sent to the cell to the determined RE; 将所述MBSFN子帧发送给各小区中的用户终端；sending the MBSFN subframe to user terminals in each cell; 在MBSFN子帧的每个PRB包含的、除承载PDCCH、CRS和DM-RS的RE之外的RE中，确定承载CSI-RS的RE，具体包括：Among the REs included in each PRB of the MBSFN subframe, except for the REs carrying PDCCH, CRS and DM-RS, determine the REs carrying CSI-RS, specifically including: 将发送CSI-RS的CSI-RS端口划分为至少一个CSI-RS端口组，每个CSI-RS端口组中包含的CSI-RS端口的数量为2个；Divide the CSI-RS port for sending the CSI-RS into at least one CSI-RS port group, and the number of CSI-RS ports contained in each CSI-RS port group is 2; 针对每个CSI-RS端口，在MBSFN子帧的每个PRB包含的、除承载PDCCH、CRS和DM-RS的RE之外的RE中，确定承载CSI-RS的RE，其中，针对同一CSI-RS端口组中的各CSI-RS端口所确定出的RE相同，针对不同CSI-RS端口组中的CSI-RS端口所确定出的RE不同。For each CSI-RS port, among the REs included in each PRB of the MBSFN subframe, except for the REs carrying PDCCH, CRS and DM-RS, determine the REs carrying the CSI-RS, wherein, for the same CSI- The REs determined for each CSI-RS port in the RS port group are the same, and the REs determined for the CSI-RS ports in different CSI-RS port groups are different. 2.如权利要求1所述的信道状态信息参考信号发送方法，其特征在于，针对每个CSI-RS端口，确定承载CSI-RS的RE，具体包括：2. The channel state information reference signal transmission method according to claim 1, wherein, for each CSI-RS port, determining the RE carrying the CSI-RS specifically includes: 针对每个CSI-RS端口，分别执行：For each CSI-RS port, execute: 在MBSFN子帧的每个PRB包含的、除承载PDCCH和CRS的正交频分复用OFDM符号之外的OFDM符号中选择1个或2个OFDM符号；Select 1 or 2 OFDM symbols in each PRB of the MBSFN subframe, except for OFDM symbols carrying PDCCH and CRS; 在选择的OFDM符号所包含的、除承载DM-RS的RE之外的RE中，将相同子载波上的每两个RE或相同OFDM符号上的每两个子载波相邻的RE组合为一个RE对；Among the REs included in the selected OFDM symbol, except the RE carrying the DM-RS, combine every two REs on the same subcarrier or every two adjacent subcarriers on the same OFDM symbol into one RE right; 在组合出的RE对中，选择至少一个RE对；Among the combined RE pairs, select at least one RE pair; 将选择出的各RE对中的各RE，确定为承载CSI-RS的RE。Each RE in each selected RE pair is determined as an RE carrying a CSI-RS. 3.如权利要求2所述的信道状态信息参考信号发送方法，其特征在于，将所述MBSFN子帧发送给各小区中的用户终端，具体包括：3. The channel state information reference signal sending method according to claim 2, wherein sending the MBSFN subframe to the user terminal in each cell specifically comprises: 为每个CSI-RS端口组中的各CSI-RS端口分别分配一个正交扩频码OCC，其中分配的OCC的长度为2；Assigning an orthogonal spreading code OCC to each CSI-RS port in each CSI-RS port group, wherein the length of the assigned OCC is 2; 针对每个CSI-RS端口组中的各CSI-RS端口，根据分配的OCC，分别将各RE对中的RE所承载的CSI-RS发送给各小区中的用户终端。For each CSI-RS port in each CSI-RS port group, respectively send the CSI-RS carried by the REs in each RE pair to the user terminal in each cell according to the allocated OCC. 4.如权利要求2所述的信道状态信息参考信号发送方法，其特征在于，组合出的每个RE对中的两个RE为相同OFDM符号上的两个子载波相邻的RE；4. The channel state information reference signal transmission method according to claim 2, wherein the two REs in each RE pair combined are REs adjacent to two subcarriers on the same OFDM symbol; 针对任意CSI-RS端口组中的各CSI-RS端口，分别在频域相邻的两个PRB中选择出的RE对所对应的OFDM符号不同。For each CSI-RS port in any CSI-RS port group, the OFDM symbols corresponding to the RE pairs selected from two adjacent PRBs in the frequency domain are different. 5.如权利要求2所述的信道状态信息参考信号发送方法，其特征在于，针对规定数目的相邻小区分别选择出的RE对互不重叠。5. The channel state information reference signal transmission method according to claim 2, characterized in that the RE pairs selected for a predetermined number of adjacent cells do not overlap with each other. 6.如权利要求2所述的信道状态信息参考信号发送方法，其特征在于，所述MBSFN子帧采用常规循环前缀Normal CP；6. The channel state information reference signal sending method as claimed in claim 2, wherein the MBSFN subframe adopts a normal cyclic prefix Normal CP; MBSFN子帧的每个PRB中承载DM-RS的RE为：按照时间由先到后的顺序依次排列的第3个、第4个、第13个和第14个OFDM符号上的若干个RE。The REs carrying the DM-RS in each PRB of the MBSFN subframe are: several REs on the 3rd, 4th, 13th and 14th OFDM symbols arranged in sequence from time to time. 7.如权利要求6所述的信道状态信息参考信号发送方法，其特征在于，针对每个CSI-RS端口分别选择出的RE对为：7. The channel state information reference signal transmission method according to claim 6, wherein the RE pair selected for each CSI-RS port is: 第3个、第4个、第5个、第6个、第11个、第12个、第13个和第14个OFDM符号上的任意一个RE对，该RE对中的两个RE为相同子载波上OFDM符号相邻的两个RE或者相同OFDM符号上子载波相邻的两个RE。Any RE pair on the 3rd, 4th, 5th, 6th, 11th, 12th, 13th and 14th OFDM symbols, the two REs in the RE pair are the same Two REs adjacent to OFDM symbols on a subcarrier or two REs adjacent to subcarriers on the same OFDM symbol. 8.如权利要求2所述的信道状态信息参考信号发送方法，其特征在于，所述MBSFN子帧采用扩展循环前缀Extended CP；8. The channel state information reference signal sending method according to claim 2, wherein the MBSFN subframe adopts an extended cyclic prefix Extended CP; MBSFN子帧的每个PRB中承载DM-RS的RE为：按照时间由先到后的顺序依次排列的第3个、第4个、第11个和第12个OFDM符号上的若干个RE。The REs carrying the DM-RS in each PRB of the MBSFN subframe are: several REs on the 3rd, 4th, 11th and 12th OFDM symbols arranged in sequence from time to time. 9.如权利要求8所述的信道状态信息参考信号发送方法，其特征在于，针对每个CSI-RS端口分别选择出的RE对为：9. The channel state information reference signal transmission method according to claim 8, wherein the RE pair selected for each CSI-RS port is: 第3个、第4个、第5个、第6个、第9个、第10个、第11个和第12个OFDM符号上的任意一个RE对，该RE对中的两个RE为相同子载波上OFDM符号相邻的两个RE或者相同OFDM符号上子载波相邻的两个RE。Any RE pair on the 3rd, 4th, 5th, 6th, 9th, 10th, 11th and 12th OFDM symbols, the two REs in the RE pair are the same Two REs adjacent to OFDM symbols on a subcarrier or two REs adjacent to subcarriers on the same OFDM symbol. 10.一种信道状态信息参考信号发送装置，其特征在于，包括：10. A channel state information reference signal sending device, characterized in that, comprising: 确定单元，用于针对每个小区，在多媒体广播单频网MBSFN子帧的每个物理资源块PRB包含的、除承载物理下行控制信道PDCCH、公共参考信号CRS和解调参考信号DM-RS的资源单元RE之外的RE中，确定承载信道状态信息参考信号CSI-RS的RE；The determination unit is configured to, for each cell, include in each physical resource block PRB of the multimedia broadcast single frequency network MBSFN subframe, except for the physical downlink control channel PDCCH, the common reference signal CRS and the demodulation reference signal DM-RS Among the REs other than the resource unit RE, determine the RE carrying the channel state information reference signal CSI-RS; 映射单元，用于将需要发送给该小区的CSI-RS映射到确定单元确定出的RE中；a mapping unit, configured to map the CSI-RS that needs to be sent to the cell to the RE determined by the determining unit; 发送单元，用于将映射单元映射后的MBSFN子帧发送给各小区中的用户终端；a sending unit, configured to send the MBSFN subframes mapped by the mapping unit to user terminals in each cell; 确定单元具体包括：The identified units specifically include: 划分子单元，用于将发送CSI-RS的CSI-RS端口划分为至少一个CSI-RS端口组，每个CSI-RS端口组中包含的CSI-RS端口的数量为2个；Divide subunits, for dividing the CSI-RS port for sending the CSI-RS into at least one CSI-RS port group, and the number of CSI-RS ports contained in each CSI-RS port group is 2; 确定子单元，用于针对每个CSI-RS端口，在MBSFN子帧的每个PRB包含的、除承载PDCCH、CRS和DM-RS的RE之外的RE中，确定承载CSI-RS的RE，其中，针对同一CSI-RS端口组中的各CSI-RS端口所确定出的RE相同，针对不同CSI-RS端口组中的CSI-RS端口所确定出的RE不同。The determination subunit is used to determine, for each CSI-RS port, REs carrying CSI-RS among REs other than REs carrying PDCCH, CRS and DM-RS included in each PRB of the MBSFN subframe, Wherein, the REs determined for the CSI-RS ports in the same CSI-RS port group are the same, and the REs determined for the CSI-RS ports in different CSI-RS port groups are different. 11.如权利要求10所述的信道状态信息参考信号发送装置，其特征在于，确定子单元具体包括：11. The channel state information reference signal transmitting device according to claim 10, wherein the determining subunit specifically comprises: 第一选择模块，用于针对每个CSI-RS端口，在MBSFN子帧的每个PRB包含的、除承载PDCCH和CRS的正交频分复用OFDM符号之外的OFDM符号中，选择1个或2个OFDM符号；The first selection module is configured to, for each CSI-RS port, select one of the OFDM symbols included in each PRB of the MBSFN subframe except for the OFDM symbols carrying PDCCH and CRS or 2 OFDM symbols; 组合模块，用于在第一选择模块选择的OFDM符号所包含的、除承载DM-RS的RE之外的RE中，将相同子载波上的每两个RE或相同OFDM符号上的每两个子载波相邻的RE组合为一个RE对；A combining module, configured to combine every two REs on the same sub-carrier or every two sub-REs on the same OFDM symbol among the REs included in the OFDM symbol selected by the first selection module, except for the RE carrying the DM-RS Carrier-adjacent REs are combined into one RE pair; 第二选择模块，用于在组合出的RE对中，选择至少一个RE对；A second selection module, configured to select at least one RE pair from the combined RE pair; 确定模块，用于将第二选择模块选择出的各RE对中的各RE，确定为承载CSI-RS的RE。The determining module is configured to determine each RE in each RE pair selected by the second selecting module as the RE bearing the CSI-RS. 12.如权利要求11所述的信道状态信息参考信号发送装置，其特征在于，发送单元具体包括：12. The channel state information reference signal sending device according to claim 11, wherein the sending unit specifically comprises: 分配子单元，用于为每个CSI-RS端口组中的各CSI-RS端口分别分配一个正交扩频码OCC，其中分配的OCC的长度为2；The allocation subunit is used to allocate an orthogonal spreading code OCC to each CSI-RS port in each CSI-RS port group, wherein the length of the allocated OCC is 2; 发送子单元，用于针对每个CSI-RS端口组中的各CSI-RS端口，分别根据分配子单元分配的OCC，将各RE对中的各RE所承载的CSI-RS发送给各小区中的用户终端。The sending subunit is used to send the CSI-RS carried by each RE in each RE pair to each cell according to the OCC allocated by the allocation subunit for each CSI-RS port in each CSI-RS port group user terminal. 13.如权利要求11所述的信道状态信息参考信号发送装置，其特征在于，组合模块组合出的每个RE对中的两个RE为相同OFDM符号上的两个子载波相邻的RE；13. The channel state information reference signal transmitting device according to claim 11, wherein the two REs in each RE pair combined by the combining module are REs adjacent to two subcarriers on the same OFDM symbol; 针对任意CSI-RS端口组中的各CSI-RS端口，第二选择模块分别在频域相邻的两个PRB中选择出的RE对所对应的OFDM符号不同。For each CSI-RS port in any CSI-RS port group, the OFDM symbols corresponding to the RE pairs selected by the second selection module in two adjacent PRBs in the frequency domain are different. 14.如权利要求11所述的信道状态信息参考信号发送装置，其特征在于，第二选择模块针对规定数目的相邻小区分别选择出的RE对互不重叠。14 . The channel state information reference signal transmitting apparatus according to claim 11 , wherein the RE pairs selected by the second selection module for a predetermined number of adjacent cells do not overlap with each other. 15.一种基站，其特征在于，包括权利要求10～14任一权利要求所述的信道状态信息参考信号发送装置。15. A base station, characterized by comprising the channel state information reference signal sending device according to any one of claims 10-14. 16.一种信道状态信息参考信号接收方法，其特征在于，包括：16. A channel state information reference signal receiving method, characterized in that, comprising: 用户终端在基站发送的多媒体广播单频网MBSFN子帧所包含的每个物理资源块PRB中，分别针对自身所在小区，在该PRB包含的、除承载物理下行控制信道PDCCH、公共参考信号CRS和解调参考信号DM-RS的资源单元RE之外的RE中，确定承载信道状态信息参考信号CSI-RS的RE；In each physical resource block PRB included in the multimedia broadcast single frequency network MBSFN subframe sent by the base station, the user terminal is respectively aimed at the cell where it is located, except for the bearer physical downlink control channel PDCCH, common reference signal CRS and Among the REs other than the resource element RE of the demodulation reference signal DM-RS, determine the RE carrying the channel state information reference signal CSI-RS; 从确定出的RE中接收CSI-RS；Receive the CSI-RS from the determined RE; 在该PRB包含的、除承载PDCCH、CRS和DM-RS的RE之外的RE中，确定承载CSI-RS的RE，具体包括：Among the REs included in the PRB, except the REs carrying PDCCH, CRS and DM-RS, determine the REs carrying CSI-RS, specifically including: 将发送CSI-RS的CSI-RS端口划分为至少一个CSI-RS端口组，每个CSI-RS端口组中包含的CSI-RS端口的数量为2个；Divide the CSI-RS port for sending the CSI-RS into at least one CSI-RS port group, and the number of CSI-RS ports contained in each CSI-RS port group is 2; 针对每个CSI-RS端口，在该CSI-RS端口发送的该PRB包含的、除承载PDCCH、CRS和DM-RS的RE之外的RE中，确定承载CSI-RS的RE，其中，针对同一CSI-RS端口组中的各CSI-RS端口所确定出的RE相同，针对不同CSI-RS端口组中的CSI-RS端口所确定出的RE不同。For each CSI-RS port, among the REs included in the PRB transmitted by the CSI-RS port, except for the REs carrying PDCCH, CRS and DM-RS, determine the REs carrying CSI-RS, wherein, for the same The REs determined for each CSI-RS port in the CSI-RS port group are the same, and the REs determined for the CSI-RS ports in different CSI-RS port groups are different. 17.如权利要求16所述的信道状态信息参考信号接收方法，其特征在于，针对每个CSI-RS端口，在该CSI-RS端口发送的该PRB包含的、除承载PDCCH、CRS和DM-RS的RE之外的RE中，确定承载CSI-RS的RE，具体包括：17. The channel state information reference signal receiving method according to claim 16, characterized in that, for each CSI-RS port, the PRB sent at the CSI-RS port includes, except for bearing PDCCH, CRS and DM- Among the REs other than the REs of the RS, the REs carrying the CSI-RS are determined, specifically including: 针对每个CSI-RS端口，分别执行：For each CSI-RS port, execute: 在该PRB包含的、除承载PDCCH和CRS的正交频分复用OFDM符号之外的OFDM符号中，选择1个或2个OFDM符号；Among the OFDM symbols included in the PRB, except for the OFDM symbols carrying PDCCH and CRS, select 1 or 2 OFDM symbols; 在选择的OFDM符号所包含的、除承载DM-RS的RE之外的RE中，将相同子载波上的每两个RE或相同OFDM符号上的每两个子载波相邻的RE组合为一个RE对；Among the REs included in the selected OFDM symbol, except the RE carrying the DM-RS, combine every two REs on the same subcarrier or every two adjacent subcarriers on the same OFDM symbol into one RE right; 在组合出的RE对中，选择至少一个RE对；Among the combined RE pairs, select at least one RE pair; 将选择出的各RE对中的各RE，确定为承载CSI-RS的RE。Each RE in each selected RE pair is determined as an RE carrying a CSI-RS. 18.如权利要求17所述的信道状态信息参考信号接收方法，其特征在于，从确定出的RE中接收CSI-RS，具体包括：18. The channel state information reference signal receiving method according to claim 17, wherein receiving the CSI-RS from the determined RE comprises: 确定为每个CSI-RS端口组中的各CSI-RS端口分别分配的正交扩频码OCC，其中分配的OCC的长度为2；Determine the orthogonal spreading code OCC allocated to each CSI-RS port in each CSI-RS port group, wherein the length of the allocated OCC is 2; 针对每个CSI-RS端口组中的各CSI-RS端口，分别根据确定出的OCC，从各RE对的各RE中接收CSI-RS。For each CSI-RS port in each CSI-RS port group, the CSI-RS is received from each RE of each RE pair according to the determined OCC. 19.如权利要求17所述的信道状态信息参考信号接收方法，其特征在于，组合出的每个RE对中的两个RE为相同OFDM符号上的两个子载波相邻的RE；19. The channel state information reference signal receiving method according to claim 17, wherein the two REs in each RE pair combined are REs adjacent to two subcarriers on the same OFDM symbol; 针对任意CSI-RS端口组中的各CSI-RS端口，分别在频域相邻的两个PRB中选择出的RE对所对应的OFDM符号不同。For each CSI-RS port in any CSI-RS port group, the OFDM symbols corresponding to the RE pairs selected from two adjacent PRBs in the frequency domain are different. 20.如权利要求17所述的信道状态信息参考信号接收方法，其特征在于，针对规定数目的相邻小区分别选择出的RE对互不重叠。20. The channel state information reference signal receiving method according to claim 17, wherein the RE pairs selected for a predetermined number of adjacent cells do not overlap each other. 21.一种信道状态信息参考信号接收装置，其特征在于，包括：21. A channel state information reference signal receiving device, characterized in that it comprises: 确定单元，用于在基站发送的多媒体广播单频网MBSFN子帧所包含的每个物理资源块PRB中，分别针对所在小区，在该PRB包含的、除承载物理下行控制信道PDCCH、公共参考信号CRS和解调参考信号DM-RS的资源单元RE之外的RE中，确定承载信道状态信息参考信号CSI-RS的RE；The determination unit is configured to, in each physical resource block PRB included in the multimedia broadcast single frequency network MBSFN subframe sent by the base station, for the cell where the PRB is located, except for the physical downlink control channel PDCCH and the common reference signal included in the PRB Among the REs other than the resource elements RE of the CRS and the demodulation reference signal DM-RS, determine the RE carrying the channel state information reference signal CSI-RS; 接收单元，用于从确定单元确定出的RE中接收CSI-RS；a receiving unit, configured to receive the CSI-RS from the RE determined by the determining unit; 确定单元具体包括：The identified units specifically include: 划分子单元，用于将发送CSI-RS的CSI-RS端口划分为至少一个CSI-RS端口组，每个CSI-RS端口组中包含的CSI-RS端口的数量为2个；Divide subunits, for dividing the CSI-RS port for sending the CSI-RS into at least one CSI-RS port group, and the number of CSI-RS ports contained in each CSI-RS port group is 2; 第一确定子单元，用于针对每个CSI-RS端口，在该CSI-RS端口发送的该PRB包含的、除承载PDCCH、CRS和DM-RS的RE之外的RE中，确定承载CSI-RS的RE，其中，针对同一CSI-RS端口组中的各CSI-RS端口所确定出的RE相同，针对不同CSI-RS端口组中的CSI-RS端口所确定出的RE不同。The first determining subunit is configured to, for each CSI-RS port, determine the CSI- RS REs, wherein the REs determined for the CSI-RS ports in the same CSI-RS port group are the same, and the REs determined for the CSI-RS ports in different CSI-RS port groups are different. 22.如权利要求21所述的信道状态信息参考信号接收装置，其特征在于，第一确定子单元具体包括：22. The channel state information reference signal receiving device according to claim 21, wherein the first determination subunit specifically comprises: 第一选择模块，用于针对每个CSI-RS端口，在该PRB包含的、除承载PDCCH和CRS的正交频分复用OFDM符号之外的OFDM符号中选择1个或2个OFDM符号；The first selection module is configured to, for each CSI-RS port, select 1 or 2 OFDM symbols in the OFDM symbols included in the PRB, except for the OFDM symbols carrying PDCCH and CRS; 组合模块，用于在第一选择模块选择的OFDM符号所包含的、除承载DM-RS的RE之外的RE中，将相同子载波上的每两个RE或相同OFDM符号上的每两个子载波相邻的RE组合为一个RE对；A combining module, configured to combine every two REs on the same sub-carrier or every two sub-REs on the same OFDM symbol among the REs included in the OFDM symbol selected by the first selection module, except for the RE carrying the DM-RS Carrier-adjacent REs are combined into one RE pair; 第二选择模块，用于在组合模块组合出的RE对中，选择至少一个RE对；The second selection module is configured to select at least one RE pair from the RE pairs combined by the combination module; 确定模块，用于将第二选择模块选择出的各RE对中的各RE，确定为承载CSI-RS的RE。The determining module is configured to determine each RE in each RE pair selected by the second selecting module as the RE bearing the CSI-RS. 23.如权利要求22所述的信道状态信息参考信号接收装置，其特征在于，接收单元具体包括：23. The channel state information reference signal receiving device according to claim 22, wherein the receiving unit specifically comprises: 第二确定子单元，用于确定为每个CSI-RS端口组中的各CSI-RS端口分别分配的正交扩频码OCC，其中分配的OCC的长度为2；The second determining subunit is used to determine the orthogonal spreading code OCC allocated to each CSI-RS port in each CSI-RS port group, wherein the length of the allocated OCC is 2; 接收子单元，用于针对每个CSI-RS端口组中的各CSI-RS端口，分别根据第二确定子单元确定出的OCC，从各RE对的各RE中接收CSI-RS。The receiving subunit is configured to, for each CSI-RS port in each CSI-RS port group, receive a CSI-RS from each RE of each RE pair according to the OCC determined by the second determination subunit respectively. 24.如权利要求22所述的信道状态信息参考信号接收装置，其特征在于，组合模块组合出的每个RE对中的两个RE为相同OFDM符号上的两个子载波相邻的RE；24. The channel state information reference signal receiving device according to claim 22, wherein the two REs in each RE pair combined by the combining module are REs adjacent to two subcarriers on the same OFDM symbol; 针对任意CSI-RS端口组中的各CSI-RS端口，第二选择模块分别在频域相邻的两个PRB中选择出的RE对所对应的OFDM符号不同。For each CSI-RS port in any CSI-RS port group, the OFDM symbols corresponding to the RE pairs selected by the second selection module in two adjacent PRBs in the frequency domain are different. 25.如权利要求22所述的信道状态信息参考信号接收装置，其特征在于，第二选择模块针对规定数目的相邻小区分别选择出的RE对互不重叠。25. The channel state information reference signal receiving apparatus according to claim 22, wherein the RE pairs selected by the second selection module for the predetermined number of adjacent cells do not overlap with each other. 26.一种用户终端，其特征在于，包括权利要求21～25任一权利要求所述的信道状态信息参考信号接收装置。26. A user terminal, characterized by comprising the channel state information reference signal receiving device according to any one of claims 21-25.
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