CN103069761B - Distribute the apparatus and method of channel condition information-reference signal in a wireless communication system - Google Patents

Abstract

Embodiments of the present invention relate to wireless communication system, particularly for the technology distributing channel condition information reference signal (CSI RS) in a wireless communication system.Embodiments of the present invention disclose for the apparatus and method to resource area distribution CSI RS, wherein, in the case of the subframe that CP is extension CP and duplexing schemes is TDD, if distribution is for the CSI RS of most 8 antenna ports, then CSI RS is assigned to the 8th symbol and the 9th symbol (symbol number l=7 and 8), wherein, each CSI RS of each two antenna port is assigned to identical RE and is distinguished from each other by orthogonal code, and is assigned spaced apart with three RE of adjacent R E of CSI RS on the frequency axis.

Description

Distribute the apparatus and method of channel condition information-reference signal in a wireless communication system

Technical field

Embodiments of the present invention relate to wireless communication system, more particularly, it relates to in a wireless communication system Distribution channel condition information-reference signal (CSI-RS:Channel State Information-Reference Signal) Technology.

Background technology

Along with the development of communication system, substantial amounts of wireless terminal is made by the consumer of such as commercial company and individual etc. With.

Such as include LTE(Long Term Evolution: Long Term Evolution) and LTE-A(LTE-Advance:LTE Senior) 3GPP(3^rdGeneration Partnership Project: third generation partner program) etc. movement Communication system is allowed for the development of the technology of high-speed high capacity communication system, and this technology can send or receive beyond carrying For the various data of the capacity of voice service, such as image and wireless data, and can send and at wire net Network sends same Large Volume Data.And, existing mobile communication system requires suitable fault detection schemes, The target of the program is to make information dropout be reduced to minimum and improve system transfers efficiency, thus improves systematic function.

Further, in existing various communication systems, in order to by up-link or downlink to counterpart device The information etc. of communication environment is provided, employs various reference signal (Reference Signal:RS).

Such as, as in Long Term Evolution (LTE) system of the evolution system for mobile communication, in order to obtain down Channel information in row transmission, sends the cell-specific reference signal (Cell-specific as reference signal in each subframe Reference Signal:CRS).

Now, owing to antenna maximum quantity supported in the downlink of LTE system is four, so according to Time/frequency, different CRS is assigned to most four antenna ports and sends.

Such as LTE-A such next generation communication technology can support eight antennas in downstream.Therefore, for four Existing antenna and the current CRS that limits are not enough to the channel information when downlink transfer be detected.In order to overcome this The problem of sample, newly defines entitled " channel condition information-reference signal (Channel State Information-Reference Signal:CSI-RS) " reference signal with obtain most eight antennas channel status Information.

In other words, it is possible to use use most eight multiple-input and multiple-output (Multiple at port and receiving port sending Input Multiple Output:MIMO) communication system of antenna, and the side sending CSI-RS can also be used Case, UE is according to for sending or receive the antenna port of signal or antenna stack and different.At present, provide only CSI-RS Basic definition and the definition of resource overhead.But, still not expressly provide according to each eNB(or eNodeB) Or the method that each antenna port in community distributes corresponding CSI-RS pattern to resource area.

Especially, the length of Cyclic Prefix (Cyclic Prefix:CP), duplexing schemes etc. can change and to be allocated To form or the type of the subframe of CSI-RS.But, in this case, not yet discuss to each antenna end The scheme of mouth distribution CSI-RS.

Summary of the invention

Technical scheme

A part for the supplementary features of the present invention will be illustrated in explanation subsequently, and a part is by according to following Describe and manifest, or can know by implementing the present invention.

The illustrative embodiments of the present invention discloses and is using extended cyclic prefix (CP) as CP, uses the time-division In the case of duplex (Time Division Duplex:TDD) scheme is as the subframe of duplexing schemes, multiple to including The resource area distribution of Resource Unit (RE) is for the channel condition information-reference signal of most eight antenna ports (CSI-RS) device or method, wherein, described CSI-RS is assigned to the 8th symbol and the 9th symbol (symbol Number numbering l=7 and 8), each CSI-RS of each two antenna port is assigned to identical RE and passes through orthogonal code simultaneously It is distinguished from each other, and is assigned spaced apart with three RE of adjacent R E of CSI-RS on the frequency axis.This Another bright illustrative embodiments discloses the dress for receiving channel state information-reference signal (CSI-RS) Putting, this device includes: signal receiver, and described signal receiver is used for receiving OFDM (OFDM) letter Number, this ofdm signal is to use extended cyclic prefix (CP) as CP, using time division duplex (TDD) Scheme is generated for the CSI-RS of most eight antenna ports by distribution as in the case of the subframe of duplexing schemes 's；CSI-RS extractor, described CSI-RS extractor divides for the signal extraction received from described signal receiver It is fitted on the CSI-RS of each antenna port in the plurality of antenna port of specific RE；And channel status survey Measuring device, described channel status measuring device is used for obtaining channel condition information (CSI) based on the CSI-RS extracted, its In, when distributing described CSI-RS for most eight antenna ports, described CSI-RS is assigned to the 8th symbol With the 9th symbol (symbol number l=7 and 8), it is assigned to phase for each CSI-RS of each two antenna port With RE and be distinguished from each other by orthogonal code, and be assigned adjacent R E of CSI-RS on the frequency axis with three Individual RE's is spaced apart.

Another illustrative embodiments of the present invention discloses for receiving channel state information-reference signal (CSI-RS) method, said method comprising the steps of: receive OFDM (OFDM) signal, institute Stating ofdm signal is by using extended cyclic prefix (CP) as CP, using time division duplex (TDD) In the case of scheme is as the subframe of duplexing schemes, distribution generates for the CSI-RS of most eight antenna ports； Each antenna port for the plurality of antenna port of specific RE it is assigned to from received signal extraction CSI-RS；And obtain channel condition information CSI based on the CSI-RS that extracts, wherein, when for most eight skies When line cap distributes described CSI-RS, described CSI-RS is assigned to the 8th symbol and the 9th symbol (symbol Numbering l=7 and 8), each CSI-RS of each two antenna port be assigned to identical RE and by orthogonal code that This distinguishes, and is assigned spaced apart with three RE of adjacent R E of CSI-RS on the frequency axis.

Should be appreciated that it is all exemplary and explanatory for summarizing the present invention above with hereafter detailed description to the present invention, Aim to provide and invention required for protection is further appreciated by.

Accompanying drawing explanation

Accompanying drawing is included to provide a further understanding of the present invention, and is merged in this specification and constitutes this explanation A part for book, accompanying drawing shows embodiments of the present invention, and for explaining the principle of the present invention together with description.

Fig. 1 is the block diagram of the structure exemplified with CSI-RS distributor according to an illustrative embodiment of the invention.

Fig. 2 to Figure 14 exemplified with various CSI-RS allocative decisions according to an illustrative embodiment of the invention, these Scheme by include CP length, duplexing schemes, in the tdd case in special subframe for downlink The quantity of OFDM symbol (DwPTS) and the various situations with or without duplicate allocation AP5 determine.

Figure 15 is the block diagram receiving device exemplified with reception CSI-RS according to an illustrative embodiment of the invention.

Figure 16 is the flow process exemplified with the method for distributing CSI-RS according to an illustrative embodiment of the invention Figure.

Detailed description of the invention

It is described more fully with illustrative embodiments below with reference to accompanying drawings, shown in the drawings of the exemplary reality of the present invention Execute mode.However, it is possible to realize the disclosure by many different forms, and should not be assumed that it is limited to institute here The illustrative embodiments stated.On the contrary, it is provided that these illustrative embodiments are to make the disclosure detailed and complete, And the scope of the present disclosure will be passed on fully to those skilled in the art.System described herein, device and/ Or various modification, amendment and the equivalent of method will appear in face of those skilled in the art.Accompanying drawing and detailed description are logical Will represent element, feature and structure by same reference numerals, and in the accompanying drawings, in order to clear and convenient, may Exaggerate size and the ratio of some element.

Embodiments of the present invention provide in a wireless communication system to the T/F for each antenna port The device of resource area distribution channel condition information-reference signal (CSI-RS).Embodiment further provides wireless To distributing channel condition information-reference signal for the time-frequency resources region of each antenna port in communication system (CSI-RS) method.

Another embodiment of the invention provides for distributing CSI-RS so that each community can have to resource area There is the device of orthogonality.Embodiments also provide for resource area distribution CSI-RS so that each community can have The method having orthogonality.

Another embodiment of the invention provide according to will be allocated CSI-RS each subframe type to Resource area distribution CSI-RS is so that each community can have the device of orthogonality.Embodiment further provides according to inciting somebody to action The type of each subframe of CSI-RS to be allocated distributes CSI-RS so that each community can have orthogonal to resource area The method of property.

Another embodiment of the invention provides according to whether can distribute to the reference signal of legacy communications system Region duplicate allocation CSI-RS, to resource area distribution CSI-RS so that each community can have the device of orthogonality. Embodiment further provides according to whether region duplicate allocation can be distributed to the reference signal of Legacy communications systems CSI-RS, to resource area distribution CSI-RS so that each community method can with orthogonality.

Another embodiment of the invention provides according to whether can be to for antenna port 5(AP5) money distributed Subframe structure information is also taken into account by source region distribution CSI-RS, comes to resource area distribution CSI-RS so that each Community can have the device of orthogonality, subframe structure information include CP length, duplexing schemes, in the feelings of TDD In special subframe, the quantity of the symbol (DwPTS) of downlink is distributed under condition.Embodiment further provides root Can be to for antenna port 5(AP5 according to whether) the resource area distribution CSI-RS that distributes by subframe structure information Take into account, to resource area distribution CSI-RS so that each community method can with orthogonality, subframe structure Information includes CP length, duplexing schemes, distributes to the symbol of downlink in the tdd case in special subframe The quantity of number (DwPTS).

Another embodiment of the invention provides for the device to resource area distribution CSI-RS, wherein, In the case of the subframe that CP is extension CP and duplexing schemes is TDD, if distribution is for most 8 antenna end The CSI-RS of mouth, then CSI-RS is assigned to the 8th symbol and the 9th symbol (symbol number l=7 and 8), its In, each CSI-RS of each two antenna port is assigned to identical RE and is distinguished from each other by orthogonal code, and And it is assigned spaced apart with three RE of adjacent R E of CSI-RS on the frequency axis.Embodiment further provides For to resource area distribution CSI-RS method, wherein, CP be extension CP and duplexing schemes be TDD Subframe in the case of, if distribution is for the CSI-RS of 8 antenna ports, then CSI-RS is assigned to the 8th symbol Number and the 9th symbol (symbol number l=7 and 8), wherein, each CSI-RS of each two antenna port be allocated To identical RE and it is distinguished from each other by orthogonal code, and is assigned adjacent R E of CSI-RS on the frequency axis Spaced apart with three RE.

Wireless communication system in illustrative embodiments is extensively arranged, to provide such as voice, grouped data etc. Various communication services.

Wireless communication system according to illustrative embodiments includes UE(User Equipment: subscriber equipment) and ENodeB(or BS(Base Station: base station)).Disclosure satisfy that expense and by utilizing CSI-RS as described below The technology that distribution or mapping can make the interference between community or between antenna port minimum is applied to UE and eNodeB, This technology will be described in more detail below in reference to Fig. 1.

As used herein, UE can refer to user terminal in wireless communication system (such as WCDMA, LTE, HSPA(High Speed Packet Access: high-speed packet access) in UE), GSM(global mobile communication System) in wireless device, MS(movement station), UT(user terminal) and SS(subscriber board).

ENodeB or community are often referred to arbitrary equipment, function or the specific region that can communicate with UE, and permissible Be referred to as another title, as Node-B, interval, stand, BTS(Base Transceiver System: base station transceiver System), AP(Access Point: access point) or via node etc..

It is to say, as used herein, eNodeB or community can have the BSC(Base representing CDMA Station Controller: base station controller) control region, WCDMA Node-B or LTE in interval Or eNodeB(or station) region that covers or the implication of function, and in various overlay area can be equivalent to Individual overlay area, overlay area include Big Residential District, macrocell, Microcell, picocell, Femto cell, in Continue node communication scope etc..

Such as CDMA(Code Division MultipleAccess: CDMA), TDMA(Time Division MultipleAccess: time division multiple acess), FDMA(FrequencyDivisionMultipleAccess: frequency division multiple access), OFDMA(Orthogonal Frequency Division Multiple Access: OFDM), The such various multiple access schemes of OFDM-FDMA, OFDM-TDMA and OFDM-CDMA can be answered For wireless communication system.

For uplink and downlink transfer, the TDD(Time utilizing different time to be transmitted can be used Division Duplex: time division duplex) scheme and utilize the FDD(Frequency Division that different frequency is transmitted Duplex: FDD) one in scheme.

Wireless communication system can be supported up-link and/or downlink HARQ and can use for link adaptive The CQI (Channel Quality Indicator:CQI) answered.Further, different Multiple Access scheme May be used for downlink transfer and uplink.Such as, OFDM (OFDMA) scheme may be used for descending Link, and single-carrier frequency division multiple access (SC-FDMA) scheme is for up-link.

In the example wireless communications applying embodiment of the present invention, a radio frame or radio frames include 10 subframes and a subframe can include two time slots.

Ultimate unit for data transmission is subframe, and performs downlink or up-link tune in units of subframe Degree.One time slot can include multiple OFDM symbol on a timeline and can include many height on the frequency axis Carrier wave.Specifically, a time slot can include 7 or 6 OFDM symbol.

Such as, if a subframe includes two time slots, then each time slot can include 7 or 6 on a timeline Individual symbol.The T/F region limited by time slot as above and 12 subcarriers on the frequency axis can claim Make Resource Block (RB).

The transmission time of radio frame has the length of 10ms and can be divided into Transmission Time Interval (Transmission Time Interval:TTI), each Transmission Time Interval has the persistent period of 1.0ms. Term " TTI " and " subframe " are used as having identical meanings.

As it has been described above, TTI is BTU, and a TTI includes two time slots, and each time slot has Identical length, wherein, each time slot can have the persistent period of 0.5ms.Time slot includes 7 or 6 Long block (Long Block:LB), each long block is equivalent to symbol.LB by means of Cyclic Prefix (Cyclic Prefixe: CP) it is spaced apart.In a word, a TTI or subframe can include 14 or 12 LB symbols.But, this theory Frame, subframe or the structure of time slot that bright book is not limited to the described above.

Each TTI or subframe may be logically divided into 14 or 12 symbols (axle) on a timeline.Each symbol (axle) can Carry an OFDM symbol.

Further, the whole system bandwidth of the length with 20MHz can be divided into the son with different frequency Carrier wave.Such as, include 14 or 12 symbols on a timeline and include 12 subcarriers (on the frequency axis 12 continuous subcarriers in individual TTI) region can be referred to as a pair Resource Block (RB).

Such as, the bandwidth of the 10MHz within a TTI can include 50 RB pair on the frequency axis.

In shapes as above is similar to the RB structure of grid, it is shaped like claiming in the constituent parts space of grid cell Make Resource Unit (Resource Element:RE), and there is each subframe or the Resource Block of configuration as described above (RB) to including 168 RE(=14 symbol × 12 subcarrier altogether) or 144 RE(=12 Symbol × 12 subcarrier).

In LTE communication system, define descending reference signal, including cell-specific reference signal Multicast/broadcast (Multicast/Broadcast on (Cell-specific Reference Signal:CRS), Single Frequency Network Over Single Frequency Network:MBSFN) reference signal and UE dedicated reference signals (UE-specific Reference signal:DM-RS reference signal).

In these reference signals, CRS reference signal may be used for unicast transmission, rather than MBSFN transmission； Thus, during CRS reference signal can be included in all descending sub frames do not supported in the community that MBSFN transmits also And be transmitted.It is possible to further transmit CRS by the one or more antennas in antenna port index 0 to 3.

Further, send a reference signal by each uplink/downlink antenna port, and be used in a slot passing through A port in multiple antenna ports sends the RE of RS cannot be used for another antenna port in same time slot.

Can provide and CRS is mapped to the antenna port different according to four and the example of different T/F RE. In each antenna port, the RE being assigned CRS can have the cycle of 6 RE for subcarrier.

Some next generation communication technology supports most eight antennas in the downlink.That is, it is four existing antenna definition CRS be not enough to when downlink transfer detect channel information.To this end, newly define entitled " channel condition information-base Calibration signal (CSI-RS) " reference signal, to obtain the channel condition information for most eight antennas in downstream.

Being currently discussed according to LTE-A, is including along frequency axis and a RB along frequency axis for each community To 12 corresponding subcarriers and having in the region of each predetermined period along time shaft, CSI-RS is mapped To a RE for each antenna port.Accordingly, for total of eight antenna port, distribute and transmit most 8 RE.In this occasion, predetermined period is corresponding with the multiple of the time of the 5ms including 5 subframes (i.e., in advance Fixed cycle can be 5ms, 10ms etc.).If predetermined period is 5ms, then at one corresponding with 10ms In 10 subframes in radio frame, two subframes send CSI-RS altogether.Therefore, when defining for one During the CSI-RS pattern of subframe, CSI-RS can be assigned to other subframe with predetermined period.

Disclose and all use most 8 × 8 multiple-input and multiple-output (MIMO) antennas at transmission port and receiving port Communication system.Within the system, owing to transmitting the CSI-RS different according to antenna port or antenna stack, so sending out The machine of penetrating can distribute the CSI-RS for total of eight antenna port to time-frequency domain in the way for the treatment of with a certain discrimination.Cause And, CSI-RS can be distributed according to the mode of the community that can be distinguished from each other in multi-cell environment.

In this manual, antenna stack refers to can be delivered simultaneously to multiple antenna end in logic from eNodeB or UE The data Layer of mouth.But, antenna stack can have identical data or different pieces of information.Therefore, the quantity of antenna stack is permissible Quantity equal to or less than antenna port.

It is described below based on antenna port, but can be applicable to antenna stack.

Point out as discussed above, have been disclosed for about CSI-RS with for the expense of an each antenna port of subframe Basic definition.But, the most not explicitly disclosed according to each eNodeB(or community) in each antenna end Mouth distribution the method transmitting corresponding reference signal patterns.Therefore, join open at least one subframe now The method putting CSI-RS pattern.

By using the example that can obtain the RE that can be used for CSI-RS definitions as described above.For single subframe, And especially in the case of normal sub-frames, by existing CRS, control area and LTE Rel-9/10DM-RS (Demodulation Reference Signal: demodulation reference signal) position in altogether 14 symbols considers In.Based on this consideration, CSI-RS can be assigned to the tenth symbol or the 11st symbol, and by the tenth symbol Number or the 11st symbol transmission, with prevent with existing CRS overlap.

Further, for normal sub-frames, in the case of the DM-RS even considering Rel-8, it is possible to use with The different scheme of said method determines the RE that can be used for CSI-RS.

For a subframe, it is important that have the CSI-RS pattern of orthogonality for the distribution of each antenna port.But, If only by being mapped to the CSI-RS sequence of limited CSI-RS pattern to distinguish eNodeB(or community), then A lot of neighbor cells can be made to send CSI-RS by identical time-frequency resources, and this causes neighbor cell simultaneously Between interference.This may cause serious performance degradation.In the disclosure, term " orthogonality " can refer to excellence Orthogonality, but it is not necessarily limited to this.

Especially, such as cooperation multiple spot Tx/Rx system (Cooperative Multipoint Tx/Rx System: CoMP) in such communication system, wherein user to/from neighbor cell and Serving cell, (user currently passes Community used by defeated/reception) send/receive reference signal, the reception power of the CSI-RS of neighbor cell is less than service The reception power of the CSI-RS in district is weak.Therefore, if Serving cell and adjacent cell are simultaneously by m-time identical Frequency resource sends CSI-RS, then user is likely difficult to be correctly detected the CSI-RS from neighbor cell.

Therefore, present embodiment can provide following scheme, wherein relative to the time-frequency resources for each community Distribute while there is orthogonality (or mapping) and then send CSI-RS, thus reduce and made by the interference between neighbor cell The performance degradation become.

CP length, duplexing schemes (TDD or FDD) etc. can change the structure of subframe.Present embodiment proposes Distribution or map and to send CSI-RS and Shi Ge community (or community group) each relative to for various subframe type Individual time-frequency resources has the method for orthogonality.

Therefore, embodiments of the present invention may comprise steps of: receives the son of the subframe of CSI-RS to be allocated Frame structure information, community ID(identifier), include the bandwidth information of eNB or the eNodeB(of antenna port quantity or Community) information and include the input of system information of sub-frame number；And by use this subframe structure information and this be System information, distributes the CSI-RS of each antenna port to resource area and makes one or more community (or community group) In frequency/time resource, there is orthogonality.

Subframe structure information can include CP length information and duplexing schemes information (FDD/TDD).If duplex side Case is TDD, then for descending chain in one or two special subframe in radio frame can be included in special subframe The quantity of the OFDM symbol (DwPTS) on road, and the step distributing CSI-RS may include that additional consideration Whether use the AP(antenna port corresponding with the third and fourth CRS antenna port) 2 and AP(antenna ports) 3。

Fig. 1 is the block diagram of the structure exemplified with CSI-RS distributor according to an illustrative embodiment of the invention.

CSI-RS maker 110 and CSI-RS allotter is included with reference to Fig. 1, CSI-RS distributor 100 120。

CSI-RS maker 110 receives such as subframe structure information and the such information of system information, and based on connecing The information received generates CSI-RS or CSI-RS sequence.CP length in this subframe structure message reflection subframe or CP structural approach (conventional CP or extension CP) and each existing CRS or DM-RS(include Rel-8DM-RS) Institute's use antenna quantity one or more combination, to detect the structure of the subframe of current application CSI-RS also And generate the CSI-RS pattern being suitable to detected structure.This system information can include eNodeB(or community) One or more combination of information, via node information, UE information and sub-frame number.ENodeB(or community) Information can be such as eNodeB(or community) aerial information, eNodeB(or community) bandwidth information and community Id information.This system information can include community ID, so that the configuration of CSI-RS is capable of identify that each community group.

Such as, CSI-RS maker 110 is believed by the system-specific that the bandwidth information that utilizes such as eNodeB is such Breath determines sequence length, and receives cell ID information and respective cell ID that selection has predetermined that CSI-RS。

CSI-RS allotter 120 receives subframe structure information, system information and frame timing information, and to time M-frequency resource unit distributes the CSI-RS according to antenna port generated by CSI-RS maker 110.It After, CSI-RS Yu the eNodeB transmission frame being assigned to RE carries out multiplexing.

CSI-RS allotter 120 carries out following basic function, and this basic function is for the resource according to CSI-RS Pre-defined rule distribution OFDM symbol (x-axis) in distribution method and the resource of sub-carrier positions (y-axis), and In predetermined frame timing, the resource distributed and eNodeB transmission frame are carried out multiplexing.

If to time-frequency domain the distribution CSI-RS of each antenna port, then basis in most 8 antenna ports The CSI-RS allotter 120 of present embodiment is according to depending on subframe structure information and such as community ID is so The subframe type that determines of system information guarantee while the orthogonality for each community (or community group) to the time -frequency resource unit distributes the CSI-RS of each antenna port.

Fig. 2 to Figure 14 exemplified with according to an illustrative embodiment of the invention according to the first to the 8th embodiment Various CSI-RS allocative decisions, according to include CP length, duplexing schemes, in the tdd case at special subframe The quantity of the interior OFDM symbol (DwPTS) for downlink and presence or absence duplicate allocation AP5 Various situations determine each CSI-RS allocative decision.

Can distribute for spy according to the mode along the direction of frequency axis according to community (or community group) with frequency shift Determine the CSI-RS of antenna port.Specifically, if there are 8 antenna ports for CSI-RS, then CSI-RS divides Join the displacement can with three types along frequency axis.Specifically, every in 3 communities (or community group) One, can be by distributing same antenna port along the direction of frequency axis one subcarrier of displacement or RE CSI-RS so that community (or community group) can be respectively provided with differentiable CSI-RS and distribute pattern.Further, If there are 8 antenna ports for CSI-RS, then community (or community group) can be by along symbol axle and frequency The displacement of two or three type of rate axle has can district for each in two or three communities (or community group) The CSI-RS divided distributes pattern.

It is more fully described below with reference to Fig. 2 to Figure 11 according to whether there is the duplicate allocation (considering distribution) of AP5 And according to according to OFDM symbol for downlink in special subframe in the case of being TDD at duplexing schemes (DwPTS) quantity and each subframe structure of CP length, to have district between community (or community group) The mode divided is to the embodiment of subframe distribution CSI-RS.

Apply the wireless communication system of embodiments of the present invention include as shown in Figure 1 according to present embodiment CSI-RS distributor 100.CSI-RS distributor can include CSI maker 110 and CSI-RS distribution Device 120.

Wireless communication system can also include that the scrambler of parts as basic dispensing device, modulation mapper, layer reflect Emitter, precoder, RE mapper, ofdm signal maker etc..But, constructed as above is in this enforcement In mode optional.

This wireless communication system can be the communication system of eNodeB.

The basic operation of wireless communication system be will now be described.Stand chnnel coding and in the downlink with code word Multiple bits scrambled device scrambling of form input, is then input to modulation mapper.Modulation mapper is by after scrambling Bit modulation is complex modulation symbol.Complex modulation symbol is mapped to single transport layer or multiple transport layer by layer mapper.In advance Encoder carries out precoding to complex modulation symbols on each transmission channel of antenna port.Afterwards, RE mapper will Complex modulation symbol for each antenna port is mapped to related resource unit.

In this embodiment, CSI-RS maker generates CSI-RS, and provides to CSI-RS allotter The CSI-RS generated.CSI-RS allotter individually or with resource unit mapping device in combination, according to as above Described scheme will be assigned to time-frequency domain according to the CSI-RS of antenna port, and will be divided according to predetermined timing CSI-RS Yu the eNodeB transmission frame joined carries out multiplexing.

Afterwards, ofdm signal maker generates multiple time domain OFDM signal for each antenna port, and leads to Cross related antenna port and transmit the multiple time domain OFDM signal generated.

CSI-RS distributor and resource unit mapping device can be realized by hardware or Integrated Simulation.

CSI-RS allocative decision as shown in Figure 2 can apply to usual structure, such as according to the FDD of conventional CP The subframe structure of scheme.

According to CSI-RS allocative decision as shown in Figure 2, for each antenna port in most 8 antenna ports, CSI-RS is assigned to T/F source region, wherein, the CSI-RS of antenna port in a subframe with one Symbol is that unit (symbol axle) is assigned to four RE or subcarrier, and be assigned CSI-RS adjacent R E or Subcarrier is spaced apart with three RE or subcarrier.In this occasion, within a subframe, CSI-RS (such as, as shown in Figure 2, CSI-RS can be assigned to the tenth to be assigned to two symbols (symbol axle) altogether OFDM symbol and the 11st OFDM symbol), each for antenna port each in total of eight antenna port CSI-RS is repeatedly assigned to two RE and the CSI-RS by orthogonal code with another antenna port distinguishes. It is to say, total of eight antenna port is combined into four right, every pair is distinguished from each other by FDM, and every centering Two antenna ports are by using the CDM(CDM-T of such as orthogonal superposition code (OCC) such orthogonal code) that This distinguishes.

In this occasion, CSI-RS allotter performs distribution and for each community (or community group) It is used in the CSI-RS square upward displacement at frequency axis of specific antenna port.Further, CSI-RS distribution Device can perform blanking, and blanking makes RE empty, wherein, except either own cell group (the community group belonging to Serving cell) Outside another community group send CSI-RS, and do not send data to RE；Maybe can perform noise elimination, noise elimination profit Transmission is performed by zero energy.It is to say, CSI-RS allotter performs distribution and makes for each community (or community group) makes the CSI-RS of same antenna port carry out frequency shift.Further, CSI-RS distribution Device performs distribution and makes the CSI-RS of same antenna port exist for 3 communities (or community group) Zhong Ge community The direction of frequency axis carries out one subcarrier of frequency shift or RE so that at least three community group in a subframe Can have different CSI-RS and distribute pattern.

Although Fig. 2 shows the method for predetermined subframe configuration CSI-RS, but the method is applied to various subframe The situation corresponding with routine CP and FDD in structure.Therefore, it can for including extending CP or duplexing schemes It is that the subframe structure plan of establishment of TDD is to configure CSI-RS.Further, although the method shown in Fig. 2 will not be made AP5(antenna port No.5 for LTE Rel-8DM-RS) take into account, but if AP5's leaves over impact Greatly, then the existence of AP5 can be considered when configuring CSI-RS.

Therefore, embodiments of the present invention as shown in Figures 2 to 11 propose for distributing and transmitting CSI-RS Method, the method is by (such as (examining about whether the duplicate allocation that there is AP5 according to each subframe structure Consider distribution), duplexing schemes (FDD/TDD) and the information of CP length), little for each in the group of multiple communities District's group is distributed (from the orthogonality of time/frequency resource view) and transmits CSI-RS with having orthogonality, can reduce The performance degradation caused due to the interference between neighbor cell in various subframe structures.

Especially, in the case of the subframe of embodiment as shown in Figure 10, (wherein, CP is extension CP, duplex Scheme is TDD and allows to AP5 duplicate allocation), if distribution is for the CSI-RS of most 8 antenna ports, Then can be assigned to identical RE according to the CSI-RS of each two antenna port and be distinguished from each other by orthogonal code, And being assigned adjacent R E of CSI-RS with three RE is spaced apart (thus to be assigned CSI-RS's at two Include two empty RE between RE) mode CSI-RS is assigned to the 8th symbol and the 9th symbol (symbol is compiled Number l=7 and 8).

Fig. 2 to Figure 11 exemplified with according to the embodiment of the present invention, include CP length, duplexing schemes, with And consider or do not consider AP5 various in the case of various CSI-RS allocative decisions.

AP0, AP1, AP2 and AP3 are the antenna ports for CRS, and AP5 is for Rel-8DM-RS Antenna port.If only two antennas are for CRS, AP0 and AP1 is the most only used or not AP2 and AP3. In the tdd case, different from FDD, 10 subframes include the descending sub frame that is provided separately and up son altogether Frame and one or two special subframe, it is interior for downlink that this special subframe is respectively included in special subframe OFDM symbol (DwPTS), guard band (GB) and the OFDM symbol (UpPTS) for up-link. Include that conventional CP still extends CP, in this special subframe according to special subframe pattern and/or according to the subframe after configuration OFDM symbol (DwPTS) for downlink has different length.Such as, in the case of conventional CP, In special subframe quantity for the OFDM symbol of downlink be altogether 3 in 14 symbols, 9,10 Individual, one of 11 and 12.In the case of extension CP, for the OFDM of downlink in special subframe The quantity of symbol is one of 3,8,9 or 10.But, the invention is not restricted to these quantity.

In this occasion, FS1(Frame Structure type1: frame structure Class1) expression FDD, and FS2 (Frame Structure type2: frame structure type 2) represents TDD.

Fig. 2 shows CSI-RS allocative decision according to the first embodiment of the invention, this CSI-RS distribution side The descending sub frame that case is conventional CP for CP and duplexing schemes is FDD or TDD.

Further, in first embodiment of the present invention as shown in Figure 2, regardless of whether using AP2 Or in the case of AP3, it is allowed to AP5 duplicate allocation (i.e., it is allowed to distribute CSI-RS to the position of AP5), i.e. No matter use AP2 or AP3 the most not use AP2 or AP3, be all identical.

Hereinafter configuration is applied to first embodiment of the present invention.

Employing two continuous print OFDM symbol, the two OFDM symbol can include the tenth symbol and the tenth One symbol (that is, l=9 and 10).

Each two antenna port is combined into a pair, and multiple right by FDM multiplexing, the most orthogonal by utilizing The CDM(of superimposed code (OCC) such orthogonal code i.e., CDM-T) multiplexing is for each two internal sky Two continuous OFDM symbol of line cap.

In the present embodiment, orthogonal code can be to have the code of orthogonality, such as two Walsh (Walsh) Code.It is to say, in fig. 2 it is possible to by orthogonal code 1(OCC1) (such as [1,1]) identify and refer on previous RE The CSI-RS of the antenna port shown, and can be by orthogonal code 2(OCC2) after (such as [1 ,-1]) mark The CSI-RS of the antenna port of the upper instruction of RE.

In Fig. 2 to Figure 11, the RE of above-noted numbering corresponding to the RE of CSI-RS is assigned, and These numberings are corresponding to the numbering of the antenna port of allocated CSI-RS.

Two symbols can be assigned to (even if distributing 3/5/7 antenna for the CSI-RS of 2/4/8 antenna port Port, by adding the antenna port of respective numbers to obtain even number CSI-RS by an other antenna port Antenna port).If it is to say, 7 antenna ports of distribution, then considering 8 antenna end for CSI-RS configuration Mouthful, this cause the quantity of antenna port be the half of quantity of 8 and antenna port be 4), and for each Individual symbol, CSI-RS is assigned to the RE. corresponding with the half of antenna port quantity such as, if distribution is used for The CSI-RS of 8 antenna ports, then, in each symbol, the CSI-RS for each antenna port is assigned to 4 Individual RE(or subcarrier).

Between adjacent R E being assigned CSI-RS for a symbol axle, it is provided with and " 24/(days along frequency axis The quantity of line cap) " corresponding RE interval.Such as, if distribution is for the CSI-RS of 8 antenna ports, Between adjacent R E being assigned CSI-RS, then set up the interval of 3 RE along frequency axis for a symbol axle (which imply that two empty RE of existence).

According to community group ID, frequency shift can occur in units of altogether 12 subcarriers.In this occasion, Based on the interval being assigned between adjacent R E of CSI-RS, group special pattern in community can be generated in a subframe (there is the reuse factor of orthogonality), these special patterns of community group be distinguished from each other and with at most " 24/(antenna end Mouth quantity) " corresponding.In this occasion, such as, if distribution is for the CSI-RS of 8 antenna ports, then The total of three community special pattern of group that can distinguish the most completely can be generated in a subframe.

In RE, can perform blanking, blanking makes following RE empty, except the community group (Serving cell of self Belonging to community group) outside another community group to this RE send CSI-RS, and not to this RE send data； Maybe can perform the noise elimination utilizing zero energy to perform transmission.

According to the first embodiment of the invention CSI-RS allocative decision as above can be by equation 1 below table Show.Equation 1 below shows and is adapted to assist in the representative illustration understanding the present invention, and can be able to maintain that above-mentioned Represent in another way in the range of basic scheme.

CSI-RS antenna port=1,3,5,7:OCC [+1 ,+1]

CSI-RS antenna port=2,4,6,8:OCC [+1 ,-1]

K=12 m+ (v+v_Displacement)mod12

L=9,10

$m=\mathrm{0,1,2},...,N_{\mathrm{R\; B}}^{\mathrm{D\; L}}-1$

[formula 1]

In formula 1, k represents that subcarrier number, l represent symbol number,Represent community ID, and Represent the quantity of descending middle RB.

In this occasion, CSI-RS is duplicatedly distributed the numbering of antenna port of identical RE and antenna port Numbering can change and be not limited to the example shown in Fig. 2 along the sequence of frequency direction.It is to say, at Fig. 2 In, along with sub-carrier indices increases, perform distribution with the sequence of (1,2), (5,6), (3,4) and (7,8).But, This is not necessary condition, and if sub-carrier indices increase or reduce, then can use other antenna port combination or Other sequence (e.g., (1,2), (3,4), (5,6) and (7,8)) is allocated.

But, as in figure 2 it is shown, the antenna port to a RE that is duplicatedly distributed can be adjacent sky located adjacent one another Line cap.It is to say, in fig. 2, it is duplicatedly distributed to (l, the antenna port of k)=(9 and 10,0) is permissible It is adjacent one another are or neighbouring antenna port 1 and antenna port 2.

As it has been described above, the symbol axle in first embodiment of the present invention as shown in Figure 2, in group A of community On (l=9 and 10), the CSI-RS of (1,2), (5,6), (3,4) and (7,8) be assigned to k=0,3, The position of 6 and 9；On identical symbol axle in group B of community, (1,2), (5,6), (3,4) and (7,8) CSI-RS is assigned to the position of k=1,4,7 and 10 along frequency axis displacement+1；And in community group C In, the CSI-RS of (1,2), (5,6), (3,4) and (7,8) is assigned to the position of k=2,5,8 and 10 Put.

But, combination and sequence that the antenna port along frequency direction arrangement is numbered are not necessarily limited to Fig. 2, and can adopt By other combination or sequence.

Fig. 3 shows CSI-RS allocative decision second embodiment of the invention, as shown in Fig. 2 One embodiment, this CSI-RS allocative decision is conventional CP for CP and duplexing schemes is FDD or TDD Descending sub frame.

But, although allowing the duplicate allocation of AP5 in first embodiment of the present invention, but such as Fig. 3 institute The second embodiment of the present invention shown does not allows the duplicate allocation of AP5.

In second embodiment of the present invention, regardless of whether using AP2 or AP3(i.e., no matter use AP2 Or AP3 does not the most use AP2 or AP3, it is just as).

Hereinafter configuration is applied to second embodiment of the present invention.

Employ two continuous print OFDM symbol, and distribute to two different continuous symbol axles according to community CSI-RS。

In second embodiment of the present invention, with OCC code mark antenna port and for each symbol to The RE that the half of the quantity of antenna port is corresponding distributes CSI-RS, and this is real with first of the present invention shown in Fig. 2 Execute mode identical.

Can assemble for the basic community of total of three and put CSI-RS.In the first community group, CSI-RS is assigned to Tenth symbol axle and the 11st symbol axle, and be assigned in the tenth symbol axle and the 11st symbol axle Other RE in addition to the RE that AP5 is positioned at.In the second community group, CSI-RS is assigned to the 6th symbol Number axle and the 7th symbol axle and be assigned in addition to the RE that AP5 and Rel-9/10DM-RS is positioned at Other RE.In the 3rd community group, CSI-RS is assigned to the 13rd symbol axle and the 14th symbol axle and quilt It is assigned to other RE in addition to the RE that AP5 and Rel-9/10DM-RS is positioned at.In this occasion, with Each community group corresponding CSI-RS distribution pattern can be by the CSI-RS corresponding with another community group be divided Figure case carries out time/frequency displacement and generates.For example, it is possible to by by the CSI-RS corresponding with the first community group Distribution pattern along the OFDM symbol axle displacement-4 corresponding with the time and moves along the subcarrier axle corresponding with frequency Position+1 generates the CSI-RS corresponding with the second community group and distributes pattern.

If employing 8 CSI-RS antenna ports, then can generate three differentiable communities in a subframe Organize special pattern (there is the reuse factor of orthogonality).If employing two or four CSI-RS antenna port, then Distinct from each other 12 can be generated in a subframe or 6 special patterns of community group (have the weight of orthogonality By the factor).

Further, it is possible to make to be assigned with the RE noise elimination of the CSI-RS of another community (community group) or blanking Construct also identical with the first embodiment shown in Fig. 2.

CSI-RS allocative decision second embodiment of the invention shown in Fig. 3 can be by equation 2 below table Show.Equation 2 below shows and is adapted to assist in the representative illustration understanding the present invention, and can be able to maintain that above-mentioned Represent in another way in the range of basic scheme.

CSI-RS antenna port=1,3,5,7:OCC [+1 ,+1]

CSI-RS antenna port=2,4,6,8:OCC [+1 ,-1]

K=12 m+ (v+v_Displacement)mod12

$m=\mathrm{0,1,2},...,N_{\mathrm{RB}}^{\mathrm{DL}}-1$

[formula 2]

In this occasion, wherein CSI-RS be duplicatedly distributed identical RE antenna port numbering change, with And the numbering of antenna port can be similar with the first embodiment shown in Fig. 2 along the sequence of frequency direction.

Further, although Fig. 3 shows the combination of four RE, including (1,2)+(5,6) and (3,4) The combination of+(7,8), but the invention is not restricted to the combination shown in Fig. 3, and other combination or sequence can be used.

In a word, according to the second embodiment shown in Fig. 3, employ two continuous print community group special symbol axles, its In, community group A can shift-1 with other community groups B and C on the frequency axis.

Fig. 4 shows that be conventional CP according to third embodiment of the present invention for CP, and duplexing schemes is TDD, And the quantity distributing to the OFDM symbol (DwPTS) of downlink in subframe is the subframe of 11 or 12 CSI-RS allocative decision.In this occasion, this subframe can be the special subframe in TDD as above.

Further, in third embodiment of the present invention, it is allowed to AP5 duplicate allocation and regardless of whether making With AP2 or AP3.

Hereinafter configuration is applied to the third embodiment of the present invention shown in Fig. 4.

Employing two continuous print OFDM symbol, the two continuous print OFDM symbol can include the 6th symbol With the 7th symbol (that is, l=5 and 6).

In second embodiment of the present invention, with OCC code mark antenna port and for each symbol to The RE that the half of antenna port quantity is corresponding distributes CSI-RS, and this implements with first of the present invention shown in Fig. 2 Mode is identical.

In the first embodiment, for a symbol axle between adjacent R E being assigned CSI-RS, along frequency The RE interval that rate axle is provided with and " quantity of 24/(antenna port) " is corresponding.

In the first embodiment as shown in Figure 2, according to community group ID, community group can be generated in a subframe Special pattern, these special patterns of community group are distinguished from each other and corresponding with at most " 24/(antenna port quantity) ". Further, it is possible to make to be assigned with RE noise elimination or the structure of blanking of the CSI-RS of another community (community group) Also identical with the first embodiment shown in Fig. 2.

The CSI-RS allocative decision according to third embodiment of the present invention shown in Fig. 4 can be by equation 3 below table Show.Equation 3 below shows and is adapted to assist in the representative illustration understanding the present invention, and can be able to maintain that above-mentioned Represent in another way in the range of basic scheme.

CSI-RS antenna port=1,3,5,7:OCC [+1 ,+1]

CSI-RS antenna port=2,4,6,8:OCC [+1 ,-1]

K=12 m+ (v+v_Displacement)mod12

L=5,6

$m=\mathrm{0,1,2},...,N_{\mathrm{RB}}^{\mathrm{DL}}-1$

[formula 3]

In this occasion, in the first embodiment as shown in Figure 2, wherein CSI-RS is duplicatedly distributed identical The numbering of the numbering of the antenna port of RE and antenna port along frequency direction sequence can with shown in Fig. 4 differently Change.

Further, the frequency shift of each community group is not limited to the structure shown in Fig. 4.And, along set by frequency direction Combination and the sequence of the antenna port numbering put are not necessarily limited to Fig. 4, and can use different from shown in Fig. 4 Other combination or sequences.

Fig. 5 shows the CSI-RS allocative decision of the 4th embodiment according to the present invention, as in the of the present invention Three embodiments are the same, and this CSI-RS allocative decision is conventional CP for CP, and duplexing schemes is TDD, and The quantity of the OFDM symbol (DwPTS) distributing to downlink in subframe is the subframe of 11 or 12.But, In the 4th embodiment of the present invention, do not allow AP5 duplicate allocation.

In this occasion, subframe can be special subframe as above.

Further, in the 4th embodiment of the present invention, regardless of whether using AP2 or AP3.

Hereinafter configuration is applied to the 4th embodiment of the present invention shown in Fig. 5.

Employ two continuous print OFDM symbol, and can divide to two different continuous symbol axles according to community Join CSI-RS.

In second embodiment of the present invention, with OCC code mark antenna port and for each symbol to The RE that the half of antenna port quantity is corresponding distributes CSI-RS, and this implements with first of the present invention shown in Fig. 2 Mode is similar to.

Can assemble for the basic community of the total of three being distinguished from each other and put CSI-RS.In the first community group, CSI-RS It is assigned to the 6th symbol axle and the 7th symbol axle and is assigned to the 6th symbol axle and the 7th symbol axle In other RE in addition to the RE that AP5 is positioned at.In the second community group, CSI-RS is assigned to the 3rd Individual symbol axle and the 4th symbol axle and be assigned in the 3rd symbol axle and the 4th symbol axle except AP5 Other RE outside the RE being positioned at Rel-9/10DM-RS.In the 3rd community group, CSI-RS is assigned to Tenth symbol axle and the 11st symbol axle and be assigned in the tenth symbol axle and the 11st symbol axle Other RE in addition to the RE that AP5 and Rel-9/10DM-RS is positioned at.In this occasion, with each community Organizing corresponding CSI-RS distribution pattern can be by distributing pattern by the CSI-RS corresponding with another community group Time/frequency displacement generates.For example, it is possible to by distributing pattern edge by the CSI-RS corresponding with the first community group The OFDM symbol axle corresponding with the time shifts-3 and generates along the subcarrier axle displacement-2 corresponding with frequency The CSI-RS corresponding with the second community group distributes pattern.

If employing 8,4 and 2 CSI-RS antenna ports, then with the second embodiment shown in Fig. 3 Similar, 3,6 and 12 the differentiable community special pattern of group (tools can be generated in a subframe respectively There is the reuse factor of orthogonality).Further, it is possible to make to be assigned with the CSI-RS of another community (community group) RE noise elimination or the structure of blanking also similar with the second embodiment shown in Fig. 3.

The CSI-RS allocative decision of the 4th embodiment according to the present invention shown in Fig. 5 can be by equation 4 below table Show.Formula 4 shows and is adapted to assist in the representative illustration understanding the present invention, and can be able to maintain that above-mentioned the most square Represent in another way in the range of case.

CSI-RS antenna port=1,3,5,7:OCC [+1 ,+1]

CSI-RS antenna port=2,4,6,8:OCC [+1 ,-1]

K=12 m+ (v+v_Displacement)mod12

$m=\mathrm{0,1,2},...,N_{\mathrm{RB}}^{\mathrm{DL}}-1$

[formula 4]

In the first embodiment as shown in Figure 2, CSI-RS is duplicatedly distributed the volume of antenna port of identical RE Number and the numbering of antenna port can change along the sequence of frequency direction.

Further, although Fig. 5 show the combination to four adjacent R E distribution (1,2)+(5,6) and to The RE separated distributes (3,4) and the scheme of (7,8), but the invention is not restricted to the scheme shown in Fig. 5, and can To use other combination or sequence.

Thus, according to the 4th embodiment shown in Fig. 5, employ two continuous print community group special symbol axles, its In, community group A can shift+2 on the frequency axis with another community group B and C.

What Fig. 6 showed the 5th embodiment according to the present invention is conventional CP for CP, and duplexing schemes is TDD, And the quantity distributing to the OFDM symbol (DwPTS) of downlink in subframe is the CSI-RS of the subframe of 9 or 10 Allocative decision.

In this occasion, subframe is special subframe as above.

Further, in the 5th embodiment of the present invention, it is allowed to AP5 duplicate allocation and regardless of whether making With AP2 or AP3.

Hereinafter configuration is applied to the 5th embodiment of the present invention shown in Fig. 6.

Coordinate with Rel-9/10DM-RS, employ four OFDM symbol, its can include the 3rd symbol, Four symbols, the 6th symbol and the 7th symbol.

In second embodiment of the present invention, with OCC code mark antenna port and for each symbol to The RE that the half of antenna port quantity is corresponding distributes CSI-RS, and this implements with first of the present invention shown in Fig. 2 Mode is identical.

According to community group IP, can shift with the frequency of occurrences.And, if it is desired, symbol axle can additionally occur Displacement.I.e., although Fig. 6 illustrate only for antenna port (1,2) according to the frequency shift of each community ID, but CSI-RS can also be distributed to the specific subcarrier of (l=5 and 6) of community group A, and to (the l of community group B =2 and 3) specific subcarrier distribution CSI-RS.Total according to the antenna port for all CSI-RS of distribution Quantity, or the quantity according to all reuse factor required in a subframe, frequency shift can be different.Such as, If distribution for the antenna port of 8 CSI-RS, then can generate altogether three be distinguished from each other in a subframe The individual community special pattern of group.

If using 8,4 and 2 CSI-RS antenna ports, then with above-mentioned before embodiment similar, 3,6 and 12 differentiable community special patterns of group can be generated in a subframe respectively and (have orthogonal The reuse factor of property).Further, it is possible to make the RE being assigned with the CSI-RS of another community (community group) quiet Make an uproar or blanking structure also with above-mentioned before embodiment in similar.

The CSI-RS allocative decision of the 5th embodiment according to the present invention shown in Fig. 6 can be by equation 5 below table Show.Formula 5 shows and is adapted to assist in the representative illustration understanding the present invention, and can be able to maintain that above-mentioned the most square Represent in another way in the range of case.

CSI-RS antenna port=1,3,5,7:OCC [+1 ,+1]

CSI-RS antenna port=2,4,6,8:OCC [+1 ,-1]

K=12 m+ (v+v_Displacement)mod12

$m=\mathrm{0,1,2},...,N_{\mathrm{RB}}^{\mathrm{DL}}-1$

[formula 5]

In the 5th embodiment of the present invention shown in Fig. 6, employ two pairs of continuous print symbol axles (l=2/3 and 5/6), in group A of community, the CSI-RS of antenna port numbered (5,6) and (1,2) be assigned to (l, k)= (2/3,2) and the position of (5/6,2), and the CSI-RS of antenna port numbered (7,8) and (3,4) divided Be fitted on (l, k)=(2/3,7) and the position of (5/6,7), and in group B of community, CSI-RS is with identical patterns It is assigned to frequency shift+1, the position of (k=3,8).

In this occasion, CSI-RS is duplicatedly distributed the numbering of antenna port of identical RE and antenna port Numbering can change along the sequence of frequency direction, and be not limited to the embodiment shown in Fig. 6.

Further, the combination and the sequence that are assigned to the antenna port numbering of relevant position can change, it is possible to according to Each community is arranged.

5th embodiment of the present invention as shown in Figure 6 can be revised as shown in Figure 7 and Figure 8 for two things The configuration of reason Resource Block (Physical Resource Block:PRB), to perform the PRB-used for total power Binding.

It is to say, with reference to Fig. 7 and Fig. 8, use four symbols in a PRB.In this occasion, as Really for the antenna port numbered antenna port of 1,2,3 and 4, another two symbol is used for antenna to the first two symbol Port numbering is the antenna port of 5,6,7 and 8, then at next PRB(such as, odd number PRB) in be used for The CSI-RS of the numbered antenna port of 5,6,7 and 8 of antenna port is assigned at previous PRB(such as, Even number PRB) in have been allocated for the CSI-RS's for the numbered antenna port of 1,2,3 and 4 of antenna port Symbol.On the contrary, the CSI-RS for the numbered antenna port of 1,2,3 and 4 of antenna port is assigned to previous Individual PRB has been allocated for the symbol of CSI-RS for the numbered antenna port of 5,6,7 and 8 of antenna port.

Fig. 9 shows the CSI-RS allocative decision of the 6th embodiment according to the present invention, this CSI-RS distribution side Case is conventional CP for CP, and duplexing schemes is the OFDM symbol distributing to downlink in TDD, and subframe (DwPTS) quantity is the subframe of 9 or 10.But, in the 6th embodiment of the present invention, with the present invention The 5th embodiment different, do not allow AP5 duplicate allocation.

In this occasion, subframe is special subframe as above.

In the 6th embodiment of the present invention, regardless of whether using AP2 or AP3.

Hereinafter configuration is applied to the 6th embodiment of the present invention shown in Fig. 9.

Use two continuous print OFDM symbol, and can be to two different companies according to community (or community group) Continuous symbol axle distribution CSI-RS.

In second embodiment of the present invention, with OCC code mark antenna port and for each symbol to The RE that the half of antenna port quantity is corresponding distributes CSI-RS, and this implements with first of the present invention shown in Fig. 2 Mode is similar to.

Can assemble for two the basic communities altogether being distinguished from each other and put CSI-RS.In the first community group, CSI-RS It is assigned to the 6th symbol axle and the 7th symbol axle (l=5,6) and is assigned to the 6th symbol axle and the 7th Other RE in addition to the RE that AP5 and Rel-9/10DM-RS is positioned in individual symbol axle (l=5,6). In the second community group, CSI-RS is assigned to the 3rd symbol axle and the 4th symbol axle (l=2,3) and quilt It is assigned in the 3rd symbol axle and the 4th symbol axle (l=3,4) except AP5 and Rel-9/10DM-RS institute position In RE outside other RE.

If using 8 CSI-RS antenna ports, then can generate 2 differentiable community groups in a subframe Special pattern (has the reuse factor of orthogonality).Further, if using 2 or 4 CSI-RS antenna end Mouthful, then can generate most 8 or 4 differentiable community special patterns of group in a subframe and (there is orthogonality Reuse factor).To this end, group special CSI-RS pattern in each community shifts along frequency axis and symbol axle.Such as, little In district's group A, antenna port (1,2) is assigned to (l, k)=(5/6,3), and in group B of community, antenna end Mouthful (1,2) is assigned to that (this is equivalent between the group of community along frequency axis displacement-3 edge for l, k)=(2/3,2) Symbol axle displacement-1.

It is to say, the quantity of all RE configured to generate each cell-specific pattern is most in a subframe It is 16 (or being used for the twice of the quantity of the antenna port of distributed CSI-RS), and can apply such as Upper described noise elimination or blanking.

The CSI-RS allocative decision of the 6th embodiment according to the present invention shown in Fig. 9 can be by equation 6 below table Show.Formula 6 shows and is adapted to assist in the representative illustration understanding the present invention, and can be able to maintain that above-mentioned the most square Represent in another way in the range of case.

CSI-RS antenna port=1,3,5,7:OCC [+1 ,+1]

CSI-RS antenna port=2,4,6,8:OCC [+1 ,-1]

K=12 m+ (v+v_Displacement)mod12

$m=\mathrm{0,1,2},...,N_{\mathrm{RB}}^{\mathrm{DL}}-1$

[formula 6]

In a word, according to the 6th embodiment shown in Fig. 9, employ two continuous print community group special symbol axle (l= 5/6,2/3), wherein, community group A can shift+1 along frequency axis from another community group B and C.

Further, it is assigned to the combination of the antenna port numbering of relevant position and sequence can change and can be according to respectively Community is arranged.Although Fig. 9 show the combination to four adjacent RE distribution (1,2)+(5,6) and to every The RE opened distributes (3,4) and the scheme of (7,8), but the invention is not restricted to the scheme shown in Fig. 9, and permissible Use other combination or sequence.

What Figure 10 showed the 7th embodiment according to the present invention is extension CP for CP, and duplexing schemes is FDD Or TDD, and allow the descending son of AP5 duplicate allocation (i.e., it is allowed to distribute CSI-RS to the position of AP5) The CSI-RS allocative decision of frame.

But, in the 7th embodiment of the present invention, the situation not using AP2 or AP3 is taken into account, this May be different from the embodiment before above-mentioned.

Hereinafter configuration is applied to the 7th embodiment of the present invention shown in Figure 10.

Using two continuous print OFDM symbol, they can include the 8th symbol and the 9th symbol (that is, l=7 With 8).

Each two antenna port is combined into a pair, and multiplexed by FDM multiple right, and by utilize Such as the CDM(of orthogonal superposition code (OCC) such orthogonal code is i.e., CDM-T) multiplexing is for each internal two Two continuous OFDM symbol of individual antenna port, this is as in above-mentioned embodiment.

CSI-RS for 2/4/8 antenna port can be assigned to two symbols (if distributing 3/5/7 antenna Port, then consider to add in antenna port respective numbers another antenna port to.If it is to say, be assigned with 7 antenna ports, then consider 8 antenna ports for CSI-RS configuration, and this causes the quantity of antenna port to be 8 The half of the quantity of individual and antenna port is 4), and for each symbol, CSI-RS is assigned to and antenna The RE that the half of port number is corresponding.Such as, if distribution is for the CSI-RS of 8 antenna ports, then often In one symbol, the CSI-RS for each antenna port is assigned to 4 RE(or subcarrier).

For a symbol axle, between adjacent R E being assigned CSI-RS, it is provided with and " 24/ along frequency axis (quantity of antenna port) " interval of corresponding RE.Such as, if distribution is for 8 antenna ports CSI-RS, then set up 3 REs along frequency axis for a symbol axle between adjacent R E being assigned CSI-RS Interval (which imply that existence two empty RE).

According to community group ID, frequency shift can occur in units of altogether 12 subcarriers.In this occasion, Based on the interval being assigned between adjacent R E of CSI-RS, following community group can be generated in a subframe special Pattern (has the reuse factor of orthogonality), these special patterns of community group be distinguished from each other and with at most " 24/(days Line cap quantity) " corresponding.In this occasion, such as, if distribution is for the CSI-RS of 8 antenna ports, Then can generate the total of three community special pattern of group being distinguished from each other in a subframe.

In RE, can perform blanking, blanking makes following except the community group (community belonging to Serving cell of self Group) outside another community group to this RE send CSI-RS, and not to this RE send data；Maybe can perform Zero energy is utilized to perform the noise elimination of transmission.

As above according to the CSI-RS allocative decision of the 7th embodiment of the present invention shown in Figure 10 can by under The formula 7 in face represents.Formula 7 shows and is adapted to assist in the representative illustration understanding the present invention, and can be able to maintain that Represent in another way in the range of above-mentioned basic scheme.

CSI-RS antenna port=1,3,5,7:OCC [+1 ,+1]

CSI-RS antenna port=2,4,6,8:OCC [+1 ,-1]

K=12 m+ (v+v_Displacement)mod12

L=7,8

$m=\mathrm{0,1,2},...,N_{\mathrm{RB}}^{\mathrm{DL}}-1$

[formula 7]

In formula 7, k represents that subcarrier number, l represent symbol number,Represent community ID, andTable Show the quantity of descending RB.

As it has been described above, (the l=7 in the 7th embodiment of the present invention as shown in Figure 10, in group A of community With 8) symbol axle on, for antenna port numbered (1,2), (5,6), (3,4) and (7,8) of CSI-RS CSI-RS be assigned to the position of k=0,3,6 and 9；On identical symbol axle in group B of community, Divided respectively for the antenna port numbered (1,2) of CSI-RS, (5,6), the CSI-RS of (3,4) and (7,8) It is fitted on the position of the k=1,4,7 and 10 that shift+1 along frequency axis；And in group C of community, for CSI-RS Antenna port numbered (1,2), (5,6), the CSI-RS of (3,4) and (7,8) be assigned to k=2,5, The position of 8 and 10.

In this occasion, CSI-RS is duplicatedly distributed the numbering of antenna port of identical RE and antenna port Numbering can change and be not limited to the embodiment shown in Figure 10 along the sequence of frequency direction.It is to say, In Figure 10, along with sub-carrier indices increases, perform distribution with the sequence of (1,2), (5,6), (3,4) and (7,8). But, this not necessarily, and if sub-carrier indices increase or reduce, then can use such as antenna port compile Number for (1,2), (3,4), (5,6) and (7,8) order other antenna port such combine or other sequence carry out Distribution.In other words, antenna port is numbered the biggest CSI-RS and can be assigned to the RE that sub-carrier indices is the least. Such as, the CSI-RS of the 7th antenna port and the 8th antenna port (antenna port numbered 6 and 7) is permissible The sub-carrier indices being assigned in RB is first subcarrier of 0() two RE, and (the 5th, the 6th), ( Three, the 4th), (the first, the second) antenna port (that is, antenna port numbering is (4,5), (2,3) and (0,1) respectively) CSI-RS can be assigned to sub-carrier indices in RB be 3,6,9(i.e., be the four, the 7th respectively With the tenth subcarrier) two RE.

But, as shown in Figure 10, the antenna port of the RE that is duplicatedly distributed can be located adjacent one another adjacent Antenna port.I.e., in Fig. 10, duplicate allocation is to (l, the antenna port of k)=(7/8,0) can be adjacent each other Near antenna port 1 and antenna port 2.

But, combination and the sequence of the antenna port numbering arranged along frequency direction are not necessarily limited to Figure 10, and permissible Use other combination or sequence.

Figure 11 shows the CSI-RS allocative decision of the 8th embodiment according to the present invention, this CSI-RS distribution side Case is extension CP for CP, and duplexing schemes is TDD, for the OFDM symbol (DwPTS) of downlink in subframe Quantity be the subframe of 8 or 9/10, and allow AP5 duplicate allocation (i.e., it is allowed to distribute to the position of AP5 CSI-RS).

Additionally, as in the 7th embodiment of the present invention, only consider not use the situation of AP2 or AP3.

In this occasion, above-mentioned subframe is corresponding with special subframe.

Hereinafter configuration is applied to the 8th embodiment of the present invention shown in Figure 11.

Employ two continuous print OFDM symbol.Such as, if for the OFDM of downlink in special subframe The quantity of symbol (DwPTS) is 9 or 10, then can use the 8th and the 9th OFDM symbol axle of continuous print (l=7,8), and if in special subframe quantity for descending OFDM symbol (DwPTS) be 8, then may be used To use the 3rd and the 8th OFDM symbol axle (l=2,7).

Antenna port is identified and for each symbol to corresponding with the half of antenna port quantity with OCC code RE distributes CSI-RS, and this is identical at front embodiment with the invention described above.

As the invention described above in front embodiment, be assigned adjacent R E of CSI-RS for a symbol axle Between, the RE corresponding with " quantity of 24/(antenna port) " is set along frequency axis and is spaced.And, according to little District's group ID, can generate the following community special pattern of group, the special pattern of these community groups district each other in a subframe Point and corresponding with at most " quantity of 24/(antenna port) ".It is possible to further make another community of distribution The RE noise elimination of the CSI-RS of (community group) or the structure of blanking are also similar with the embodiment before the present invention.

The CSI-RS allocative decision of the 8th embodiment according to the present invention shown in Figure 11 can be by equation 8 below Represent.Formula 8 shows and is adapted to assist in the representative illustration understanding the present invention, and can be able to maintain that above-mentioned substantially Represent in another way in the range of scheme.

CSI-RS antenna port=1,3,5,7:OCC [+1 ,+1]

CSI-RS antenna port=2,4,6,8:OCC [+1 ,-1]

K=12 m+ (v+v_Displacement)mod12

$m=\mathrm{0,1,2},...,N_{\mathrm{RB}}^{\mathrm{DL}}-1$

[formula 8]

In the 8th embodiment of the present invention as above, if for the OFDM of downlink in a subframe The quantity (DwPTS) of symbol is 9 or 10, the most as shown in figure 11, and (l=9 and 10) in group A of community Symbol axle on, the CSI-RS of (1,2), (5,6), (3,4) and (7,8) is assigned to k=0,3,6 and The position of 9；On identical symbol axle in group B of community, (1,2), (5,6), (3,4) and the CSI-RS of (7,8) It is assigned to along frequency axis displacement+1, the position of k=1,4,7 and 10；And in group C of community, (1,2), (5,6), the CSI-RS of (3,4) and (7,8) is assigned to the position of k=2,5,8 and 10.

In this occasion, as above-mentioned in first embodiment, CSI-RS is duplicatedly distributed the sky of identical RE The numbering of the numbering of line cap and antenna port can change along the sequence of frequency direction, and the list that is duplicatedly distributed The antenna port of individual RE is antenna port located adjacent one another.

In first to the 8th embodiment of the present invention, according to community group differentiation, for a subframe reuse because of The quantity (that is, the quantity of orthogonal pattern) of son is 2 or 3, and is in most of the cases 3.

Use subframe displacement or skew in the case of, the sum of reuse factor with " reuse factor in a subframe × Assignable sub-frame number in one CSI-RS cycle " corresponding.Such as, if the reuse factor in a subframe is 3, transmission cycle is 5ms, and except master sync signal (primary synchronization is assigned Signal:PSS) and outside the subframe of auxiliary synchronous signals (secondary synchronization signal:SSS), can The sub-frame number of distribution is 4, then the sum of reuse factor can be 12 (3 × 4=12).

Figure 12, Figure 13 and Figure 14 are exemplified with additional consideration AP5 in the embodiment shown in Fig. 3, Fig. 5 and Fig. 9 The CSI-RS allocative decision of frequency shift (v-displacement).

As it has been described above, Fig. 3 shows CSI-RS allocative decision second embodiment of the invention, this CSI-RS The descending sub frame that allocative decision is conventional CP for CP and duplexing schemes is FDD or TDD.Further, In the CSI-RS allocative decision shown in Fig. 3, do not allow AP5 duplicate allocation, and regardless of whether using AP2 Or AP3.And, the frequency shift of AP5 is not taken into account by the mapping scheme in Fig. 3, i.e. is equivalent to v-and moves The scheme of position=0.If the frequency shift of AP5 is taken into account, such as, if v-shifts=1 or 2, then basis The CSI-RS allocative decision of the second embodiment of the present invention shown in Fig. 3 can be modified to shown in Figure 12 CSI-RS allocative decision.

Hereinafter configuration is applied to the CSI-RS allocative decision shown in Figure 12.

Do not considering that the CSI-RS allocative decision in the case of v-displacement is similar with the second embodiment shown in Fig. 3, Describe in detail so omitting it here.

In addition to three differentiable basic community groups, it is also possible to use the three beams relevant with the frequency shift of AP5 (bundle) community group.Three beams community group is relative with the situation of v-displacement=0, v-displacement=1 and v-displacement=2 respectively Should.Shifting for each v-, three basic community groups are relevant.Such as, if whole community groups includes 9 Individual group, then include that each bundle of three basic community groups is relevant with v-displacement, and exist and total of three AP5 The relevant community of three beams altogether group, every a branch of community group includes three relevant with v-displacement basic community group.

Simply whole community groups can be divided into three beams community group and in three the community groups relevant with v-displacement Bundle in only limit single subdistrict group.I.e., in fig. 12, can be from the community beam combination 1,2 relevant with v-displacement A community group is only selected with 3 each three community groups included.

In above-mentioned embodiment, when using 8,4 and 2 CSI-RS antenna ports, can be in a subframe Generate 3,6 and 9 the special patterns of community group (there is the reuse factor of orthogonality) distinguished completely respectively. Further, it is possible to make the structure of the RE noise elimination of the CSI-RS of other community of distribution (community group) or blanking also with The first embodiment shown in Fig. 2 identical.And, CSI-RS is duplicatedly distributed the antenna port of identical RE The numbering of change and the antenna port of numbering can be similar with above-mentioned embodiment along the sequence of frequency direction.

Figure 13 exemplified with the 4th embodiment additional consideration AP5 shown in Fig. 5 frequency shift (v-displacement=0, 1 or 2) CSI-RS allocative decision.

Hereinafter configuration is applied to the CSI-RS allocative decision shown in Figure 13.

The basic configuration of the CSI-RS allocative decision shown in Figure 13 is similar with the 4th embodiment shown in Fig. 5, institute To omit its detailed description here.

But, the difference of the embodiment shown in Figure 13 and the 4th embodiment is: in the enforcement shown in Figure 13 In mode, by making the CSI-RS distribution pattern corresponding with the first community group accord with along the OFDM corresponding with the time Number axle displacement-3 and generate corresponding with the second community group along the subcarrier axle displacement+2 corresponding with frequency CSI-RS distribution pattern (but, in the 4th embodiment, by making the CSI-RS corresponding with the first community group Distribution pattern along the OFDM symbol axle displacement-3 corresponding with the time and moves along the subcarrier axle corresponding with frequency Position-2 generates the CSI-RS corresponding with the second community group and distributes pattern).

In addition to three differentiable basic community groups, it is also possible to use the three beams relevant with the frequency shift of AP5 Community group.Structure as shown in figure 12, three beams community group respectively includes three basic communities in 9 community groups altogether Group, with v-displacement about and prevent between bundle overlapping.

Further, although Figure 13 show the combination to four adjacent R E distribution (1,2)+(5,6) and to The RE separated distributes (3,4) and the scheme of (7,8), but the invention is not restricted to the scheme shown in Fig. 5, and can To use another combination or sequence.

Figure 14 corresponds to the 6th embodiment of the present invention shown in Fig. 9, and exemplified with by the frequency shift of AP5 (v-displacement=0,1 or 2) additional consideration is in interior CSI-RS allocative decision.

The basic configuration of the CSI-RS allocative decision shown in Figure 14 is similar with the 6th embodiment shown in Fig. 9, so Here omit it to describe in detail.

But, in the embodiment shown in Figure 13, except two shown in Fig. 9 differentiable basic community group it Outward, it is also possible to use the three beams community group relevant with the frequency shift of AP5.Three beams community group respectively with v-displacement=0, V-displacement=1 is corresponding with the situation of v-displacement=2.Shift as described previously for each v-, two basic communities Group is relevant.Such as, if whole community groups is divided into 6 groups, then include each bundle of two basic community groups Relevant with v-displacement, and there is the altogether three beams community group relevant with total of three AP5, every a branch of community group bag Include two relevant with v-displacement basic community group.

Simply whole community groups can be divided into Liang Shu community group, then little at each bundle three relevant with v-displacement Single subdistrict group is only limited in district's group.I.e., in fig. 14, can be from the community beam combination 1 and 2 relevant with v-displacement The Liang Ge community group that each includes only selects a community group.

Further, CSI-RS is duplicatedly distributed the numbering of antenna port of identical RE and the volume of antenna port Number can be according to cell change along the sequence of frequency direction.Although additionally, Figure 14 is in the way of slightly different with Fig. 9 Show to the combination of four adjacent R E distribution (1,2)+(5,6) and to RE distribution (3,4) and (7,8) separated Scheme, but the invention is not restricted to the scheme shown in Fig. 5, and can use other combination or sequence.

According to the embodiment of the present invention, can be according to whether can be to antenna (AP5) duplicate allocation of numbered 5 CSI-RS in view of including CP length, duplexing schemes and distributing in special subframe descending in the tdd case The subframe structure information of the quantity of the symbol (DwPTS) of link, distributes CSI-RS to resource area, so that each little District has orthogonality.Therefore, it can transmit antenna end for multiple communities (community group) in the case of not interfering with The CSI-RS of mouth.

Figure 15 be exemplified with according to an illustrative embodiment of the invention for receive according to CSI-RS distribution and transmission Scheme and the block diagram receiving device of the CSI-RS that transmits.

Signal receiver 1510, permissible is included with reference to the reception device 1500 of Figure 15, the UE in wireless communication system CSI-RS extractor 1520, CSI-RS sequential decoding 1530 and channel status including RE de-mapping device are measured Device 1540.

Signal receiver 1510 receives signal by receiving each antenna port of device 1500, and CSI-RS extracts Device 1520 only extracts each antenna end for the plurality of antenna port distributing to specific RE from the signal received The CSI-RS of mouth.

The CSI-RS sequence of each antenna port is decoded by CSI-RS sequential decoding 1530.CSI-RS extractor 1520 and/or CSI-RS sequential decodings can be followed and the scheme described according to above-mentioned reference Fig. 2 to Figure 14 The order of CSI-RS allocative decision contrary, and channel status measuring device 1540 is by the CSI-RS after demapping Obtain channel space information (Channel Spatial Information:CSI), this channel space information be include many For the channel condition information of each antenna port in the multiaerial system of individual antenna.

Figure 16 is the flow chart of the method exemplified with distribution CSI-RS according to the embodiment of the present invention.

The method of distribution CSI-RS according to the embodiment of the present invention comprises the following steps: for each community (or Community group) and generate CSI-RS(step S1610 for each antenna port)；Identify the son of distribution CSI-RS The subframe configuration information of frame and the system information (step S1620) including community (or community group) identification information；With And by using this subframe configuration information and this system information, distribute the CSI-RS of each antenna port also to resource area And make one or more community (or community group) can have orthogonality (step S1630) in frequency/time resource.

Subframe configuration information can include CP length, duplexing schemes, special in the case of duplexing schemes is TDD It is used for the quantity of the symbol (DwPTS) of downlink in subframe, and can also include about in allocation step Whether perform AP5 duplicate allocation (i.e., if repeatedly distribute CSI-RS to the position of the CRS being assigned with AP5) Information.

In the step (step S1630) of distribution CSI-RS, according to the scheme described above by reference to Fig. 2 to Figure 14, Subframe type and AP5 that identified subframe configuration information (including CP length and duplexing schemes) determines will be passed through Whether repeat resource distribution take into account, to time/frequency resource area distribute each community (community group) and for The CSI-RS of each antenna port.

In this occasion, especially under conditions of the subframe in embodiment as shown in Figure 10, (wherein, CP is Extension CP, duplexing schemes is TDD and allows AP5 duplicate allocation), if distribution is for most 8 antenna end The CSI-RS of mouth, then can be assigned to the 8th symbol and the 9th symbol (symbol in such a way by CSI-RS Numbering l=7 and 8): each CSI-RS for each two antenna port is assigned to identical RE and by orthogonal Code is distinguished from each other, and is assigned spaced apart with three RE of adjacent R E of CSI-RS on the frequency axis.

Permissible as explained above with the CSI-RS allocative decision according to the embodiment of the present invention described by Fig. 2 to Figure 11 Use in all cases, omit it here and describe in detail, to avoid repeated description.

By using above-mentioned embodiment, CSI-RS can be distributed to time-frequency resources region and guarantee for respectively Each type planted in subframe type guarantees the orthogonality between community (community group) and maintains CSI-RS transmission Expense.As a result, it is possible to reduce the performance degradation caused due to the interference between neighbor cell.

Embodiments of the present invention as above provide according to whether can weigh to the antenna (AP5) of numbered 5 Distribute in distributing CSI-RS again and CP length, duplexing schemes, in the tdd case special subframe being included The subframe structure information of the quantity of the symbol (DwPTS) of downlink is taken into account, distributes CSI-RS to resource area, So that community can have the apparatus and method of orthogonality.As a result, it is possible to reduce due to polytype subframe structure Interference between neighbor cell and the performance degradation that causes.

Although having shown that and describing illustrative embodiments, skilled person will understand that without departing from such as In the case of the spirit and scope of the disclosure that appended claims and equivalent thereof are limited, can be to the present invention's Illustrative embodiments carries out the various changes in form and details.Thus, as long as modified example falls into claims In the range of book and equivalent thereof, these modified examples the most should not be misinterpreted as deviateing the scope of the present invention itself.

The crossing of related application is quoted

The application requires the korean patent application No. submitted on June 1st, 2010 according to 35U.S.C. § 119 (a) The korean patent application No.10-2010-0055073's that 10-2010-0052033 and on June 10th, 2010 submit to is excellent First weigh, in the way of quoting as proof, be incorporated to above-mentioned application as carried out complete elaboration at this here for all purposes.

Claims (12)

1. distributing a device for channel condition information-reference signal CSI-RS, this device includes:

First module, this first module, for using extended cyclic prefix CP as CP, uses TDD In the case of scheme is as the subframe of duplexing schemes, distribute for the resource area including multiple Resource Unit RE The CSI-RS of many eight antenna ports, wherein, described CSI-RS is assigned to corresponding to every 12 in frequency band The RE of a subcarrier at subcarrier and corresponding to the 8th symbol in subframe and the 9th symbol, symbol is compiled Number l=7 and 8, a subframe has 12 symbols altogether for described extension CP；And

Second module, this second module is used for each CSI-RS of each two antenna port is assigned to identical RE, Wherein, each CSI-RS of each two antenna port is distinguished from each other by orthogonal code, and is assigned on the frequency axis Adjacent R E of CSI-RS is spaced apart with two RE's.

Device the most according to claim 1, wherein, antenna port is numbered the biggest CSI-RS and is assigned at frequency There is on rate axle the RE of the least sub-carrier indices.

Device the most according to claim 1, wherein, for CSI-RS transmission (the 7th, the 8th), ( Five, the 6th), (the three, the 4th), the CSI-RS of (first, second) antenna port are separately dispensed in Resource Block Sub-carrier indices is 0,3,6 and 9 two RE, i.e. be respectively the first subcarrier in Resource Block, the 4th Subcarrier, the 7th subcarrier and two RE of the tenth subcarrier.

4. the method distributing channel condition information-reference signal CSI-RS, the method is before using Extended Cyclic Sew CP as CP, in the case of using TDD scheme as the subframe of duplexing schemes, multiple to including The resource area distribution of Resource Unit RE is used for the CSI-RS of most eight antenna ports,

Wherein, described CSI-RS is assigned to a subcarrier at corresponding to every 12 subcarriers in frequency band RE and corresponding to the 8th symbol in subframe and the 9th symbol, symbol number l=7 and 8, a subframe pin Described extension CP is had 12 symbols altogether,

Each CSI-RS of each two antenna port is assigned to identical RE and is distinguished from each other by orthogonal code, and And

It is assigned spaced apart with two RE of adjacent R E of CSI-RS on the frequency axis.

Method the most according to claim 4, wherein, antenna port is numbered the biggest CSI-RS and is assigned at frequency There is on rate axle the RE of the least sub-carrier indices.

Method the most according to claim 4, wherein, for CSI-RS transmission (the 7th, the 8th), ( Five, the 6th), (the three, the 4th), the CSI-RS of (first, second) antenna port are assigned to Resource Block In sub-carrier indices is 0,3,6 and 9 two RE, i.e. be respectively the first subcarrier in Resource Block, the Four subcarriers, the 7th subcarrier and two RE of the tenth subcarrier.

7., for a device for receiving channel state information-reference signal CSI-RS, described device includes:

Signal receiver, described signal receiver is used for receiving OFDM ofdm signal, and this OFDM believes Number it is by using extended cyclic prefix CP as CP, using TDD scheme as duplexing schemes In the case of subframe, distribution generates for the CSI-RS of most eight antenna ports；

CSI-RS extractor, described CSI-RS extractor divides for the signal extraction received from described signal receiver It is fitted on the CSI-RS of each antenna port in described most eight antenna ports of specific RE；And

Channel status measuring device, described channel status measuring device is for obtaining channel status based on the CSI-RS extracted Information CSI,

Wherein, when distributing described CSI-RS for most eight antenna ports, described CSI-RS is assigned to correspondence The RE of a subcarrier at every 12 subcarriers in frequency band and corresponding to the 8th symbol in subframe With the 9th symbol, symbol number l=7 and 8, a subframe has 12 symbols altogether for described extension CP, Each CSI-RS of each two antenna port is assigned to identical RE and is distinguished from each other by orthogonal code, and Spaced apart with two RE of adjacent R E of CSI-RS it is assigned on frequency axis.

Device the most according to claim 7, wherein, when distributing described CSI-RS for most eight antenna ports Time, antenna port numbers the RE that the biggest CSI-RS is assigned to have the least sub-carrier indices on the frequency axis.

Device the most according to claim 7, wherein, for CSI-RS transmission (the 7th, the 8th), ( Five, the 6th), (the three, the 4th), the CSI-RS of (first, second) antenna port are assigned to Resource Block In sub-carrier indices is 0,3,6 and 9 two RE, i.e. be respectively the first subcarrier in Resource Block, the Four subcarriers, the 7th subcarrier and two RE of the tenth subcarrier.

10., for a method for receiving channel state information-reference signal CSI-RS, described method includes following step Rapid:

Receiving OFDM ofdm signal, described ofdm signal is by using extended cyclic prefix CP is as CP, and in the case of using TDD scheme as the subframe of duplexing schemes, distribution is at most The CSI-RS of eight antenna ports and generate；

The each antenna for described most eight antenna ports of specific RE it is assigned to from received signal extraction The CSI-RS of port；And

Channel condition information CSI is obtained based on the CSI-RS extracted,

Wherein, when distributing described CSI-RS for most eight antenna ports, described CSI-RS is assigned to correspondence The RE of a subcarrier at every 12 subcarriers in frequency band and corresponding to the 8th symbol in subframe With the 9th symbol, symbol number l=7 and 8, a subframe has 12 symbols altogether for described extension CP, Each CSI-RS of each two antenna port is assigned to identical RE and is distinguished from each other by orthogonal code, and Spaced apart with two RE of adjacent R E of CSI-RS it is assigned on frequency axis.

11. methods according to claim 10, wherein, when distributing described CSI-RS for most eight antenna ports Time, antenna port numbers the RE that the biggest CSI-RS is assigned to have the least sub-carrier indices on the frequency axis.

12. methods according to claim 10, wherein, for CSI-RS transmission (the 7th, the 8th), ( Five, the 6th), (the three, the 4th), the CSI-RS of (first, second) antenna port are assigned to Resource Block In sub-carrier indices is 0,3,6 and 9 two RE, i.e. be respectively the first subcarrier in Resource Block, the Four subcarriers, the 7th subcarrier and two RE of the tenth subcarrier.