CN102088434B - Transmitting method of demodulation reference signal, sequence generating method and transmitting and receiving devices - Google Patents

Abstract

The invention relates to a transmitting method of a downlink link demodulation reference signal, transmitting and receiving devices and a generating method of a demodulation reference signal sequence. The transmitting method of the demodulation reference signal provided by the invention comprises the following step that: the transmitting device transmits the demodulation reference signal according to a demodulation reference signal pattern, wherein in the demodulation reference signal pattern, the receiving device can receive one or more orthogonal frequency division multiplexing (OFDM) symbols which are not occupied by a common reference signal (CRS) at the time domain position of the demodulation reference signal; and the demodulation reference signal is used for performing coherent demodulation on relay link downlink data transmission. Through the method and the devices, the transmission problem of a relay link downlink demodulation reference signal is solved and the conflict between the demodulation reference signal and the CRS is avoided.

Description

Demodulated reference signal sending method, sequence generating method and transmitting, receiving system

Technical field

The present invention relates to moving communicating field, in particular to a kind of demodulated reference signal sending method, sequence generating method and transmitting, receiving system.

Background technology

At present, the demand for development of mobile communication to support higher transmission rate, more perfect quorum sensing inhibitor and higher resource utilization.In order to reach high transfer rate, next generation mobile communication system will adopt higher frequency bandwidth transmission signals, and higher frequency bandwidth will bring larger path loss simultaneously, affect the network coverage.Relaying (Relay) technology can increase covering and balances and increase cell throughout, and, via node (Relay Node, be called for short RN) compared to base station, have relatively little deployment cost, therefore, relaying is regarded as Long Term Evolution (Long Term Evolution, referred to as LTE) evolution system-senior Long Term Evolution (LTE-Advanced, be called for short LTE-A) system in a key technology.

LTE/LTE-A system with OFDM(Orthogonal Frequency Division Multiplexing, OFDM) based on technology.In an ofdm system, when the communication resource is-form of frequently bidimensional.Such as, in LTE system, the communication resource of down link on time orientation with frame (frame) for unit divides, each radio frames (radio frame) length is 10ms, comprises the subframe (sub-frame) that 10 length are 1ms, as shown in Figure 1.Each subframe comprises two time slots (slot) at time orientation.According to CP(Cyclic Prefix, Cyclic Prefix, is called for short CP) difference of length, each subframe can comprise 14 or 12 OFDM symbol.When subframe adopts common CP (Normal CP) length, comprise 14 OFDM symbol in subframe, each time slot has 7 OFDM symbol; When subframe adopts expansion CP(Extended CP) length time, comprise 12 OFDM symbol in subframe, each time slot has 6 OFDM symbol.In frequency direction, resource is with subcarrier (sub-carrier) for unit divides, and specifically in the communications, the least unit of Resourse Distribute is RB(Resource Block, Resource Block), a PRB(Physical RB of corresponding physical resource, Physical Resource Block).A RB comprises 12 subcarriers at frequency domain, and corresponding to 1 time slot of time domain, two RB that the inherent time domain of same subframe is adjacent are called that RB is to (RB pair).In each OFDM symbol, the resource of corresponding 1 subcarrier is called resource element (Resource Element is called for short RE).A physical resource structure chart under common CP length as shown in Figure 2.

After introducing relay station, be equivalent to the many jumpings of the transmission of data, for double bounce system, the communication pattern of base station-terminal originally becomes the communication pattern of base station-relay station-terminal, wherein base station-relay station link is called as repeated link (backhaul link), relay station-terminal link is called as access link (access link), and base station-terminal link is called as the link that direct transfers (direct link).In multihop system, under a part of terminal is linked into relay station, complete communication service by relay station.After introducing relay station; need to ensure the backwards compatibility for terminal; namely terminal (the such as LTERelease-8 of version before ensureing; be called for short Rel-8) also can be linked into relay station under; at this time just need under the prerequisite not affecting the communication of relay station subordinate terminal, mark off a part of resource to guarantee the communication between base station and relay station.Determine in current lte-a system that base station-relay station communication communicates with relay station-terminal to carry out in a time division manner, concrete, in descending sub frame, mark off a part for base station-relay station communication, these subframes are called as relaying (Relay) subframe.For the Rel-8 terminal of relay station subordinate, Relay subframe is indicated as MBSFN(Multicast Broadcast Single Frequency Network, Multicast Broadcast Single Frequency Network, be called for short MBSFN) subframe, thus Rel-8 terminal can skip these subframes, while completing base station-relay station communication, ensure that the backwards compatibility for Rel-8 terminal.In lte-a system, the structure of Relay subframe as shown in Figure 3.In the Relay subframe shown in Fig. 3, relay station sends control information to subordinate terminal in front 1 or 2 OFDM symbol, i.e. PDCCH(Physical DownlinkControl Channel, Physical Downlink Control Channel, is called for short PDCCH).Then relay station sends the guard time interval that switches to accepting state of state through one, receives downlink data of relay link information from base station, afterwards again through from accepting state to the guard time interval of transmission state switching.Namely, in Relay subframe, relay station is merely able to receive a part of OFDM symbol.

In Relay subframe, the transmission of data will comprise relay link downlink business information, repeated link control information etc.Consider that the expense of public reference signal (cell-specific reference signal is called for short CRS) is larger, in lte-a system, support downlink unicast business datum is transmitted in MBSFN sub-frame.In MBSFN sub-frame, only before subframe, 1 or 2 OFDM symbol can transmit CRS.Concrete, according to LTE Rel-8 agreement, when subframe has common CP length, in common subframe (non-MBSFN sub-frame), CRS is transmitted in base station in the 1st, 5,8,12 OFDM symbol (CRS port 0,1) and the 2nd, 9 OFDM symbol (CRS port 2,3); In MBSFN sub-frame, CRS is only transmitted in base station in the 1st OFDM symbol (CRS port 0,1) and the 2nd OFDM symbol (port 2,3).Respectively as shown in (1) and (2) in Fig. 4, suppose that MBSFN sub-frame also has common CP length here.For relay station, relay link downlink business also may need to be supported in MBSFN sub-frame transmission.No matter be in common subframe (non-MBSFN sub-frame) or MBSFN sub-frame, the transmitting of downlink data of relay link all will based on the support of corresponding demodulated reference signal (DemodulationReference Signal is called for short DMRS).

LTE/LTE-A system extensive use MIMO(Multi-Input Multi-Output, multiple-input and multiple-output, is called for short MIMO) technology.In mimo systems, the transmission of signal can be the mode of transmit diversity (Transmit Diversity), or the mode of wave beam forming (Beamforming), or the mode of space division multiplexing (Spatial Multiplexing), etc.Transmit diversity by empty frequently (time) coding obtains diversity gain and coding gain; Beamforming technique is improved power system capacity by the method changing beam shape and is expanded the coverage area; Space division multiplexing technology improves power system capacity by the data transmitting multiple stream on identical running time-frequency resource.Wherein under wave beam forming and space division multiplexing transmission mode, data all will carry out the operation of precoding (Precoding) before being transmitted.Under different transmission mode, demodulated reference signal also has different processing modes, such as under the wave beam forming and space division multiplexing pattern of lte-a system, demodulated reference signal experiences same pre-encode operation with corresponding data, then without this process under diversity mode.Meanwhile, the reference signal in mimo system generally all needs to support multi-antenna port/multilayer transmission, and the reference signal of different port or transport layer is multiplexing in running time-frequency resource, and the demodulated reference signal of each port/layer is mutually orthogonal.

At present in the discussion of 3GPP LTE-A correlation technique, still fully do not launch about the sending method of downlink demodulation reference signals of relay link and the details discussion of associated problem.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of sending method of down link demodulation reference signal, emitter and receiving system, to solve the transmission problem of downlink demodulation reference signals of relay link, avoid conflicting of demodulated reference signal and public reference signal CRS.

For solving above technical problem, the invention provides a kind of sending method of demodulated reference signal, the method comprises:

Emitter sends demodulated reference signal according to demodulated reference signal pattern, in described demodulated reference signal pattern, the time-domain position of demodulated reference signal is that receiving system can receive and not by one or more OFDMs (OFDM) symbol that public reference signal takies; Described demodulated reference signal is used for the coherent demodulation of downlink data of relay link transmission.

Further,

When subframe has general cyclic prefix (CP) length, the time-domain position of described demodulated reference signal is the 6th, 7 OFDM symbol; When subframe has expansion CP length, the time-domain position of described demodulated reference signal is the 5th, 6 OFDM symbol.

Further,

When subframe has general cyclic prefix (CP) length, the time-domain position of described demodulated reference signal is the 6th, 7,13,14 OFDM symbol; When subframe has expansion CP length, the time-domain position of described demodulated reference signal is the 5th, 6,11,12 OFDM symbol.

Further,

When subframe has common CP length, the time-domain position of described demodulated reference signal is the 5th, 8,9 or the 5th, 8 OFDM symbol of subframe; When subframe has expansion CP length, the time-domain position of described demodulated reference signal is the 4th, 7,8 or the 4th, 7 or the 7th, 8 or the 7th OFDM symbol of subframe; Described subframe is MBSFN sub-frame.

Further,

When described subframe is common subframe, when subframe has common CP length, the time-domain position of described demodulated reference signal is the 6th OFDM symbol of subframe; When subframe has expansion CP length, the time-domain position of described demodulated reference signal is the 5th OFDM symbol of subframe;

When described subframe is MBSFN sub-frame, when subframe has common CP length, the time-domain position of described demodulated reference signal is the 5th, 6 or the 5th, 6,8,9 OFDM symbol of subframe; When subframe has expansion CP length, the time-domain position of described demodulated reference signal is the 4th, 5 or the 5th, 7 or the 4th, 5,7,8 or the 5th, 7,8 OFDM symbol of subframe.

Further,

The frequency domain position of described demodulated reference signal is:

In a Resource Block, the interval of demodulated reference signal in an OFDM symbol of same transport layer or port is 2 subcarriers, and 4 subcarriers of the demodulated reference signal of described same transport layer or port in described Resource Block and OFDM symbol are uploaded defeated; Or

In a Resource Block, the interval of demodulated reference signal in an OFDM symbol of same transport layer or port is 4 subcarriers, and 3 subcarriers of the demodulated reference signal of described same transport layer or port in described Resource Block and OFDM symbol are uploaded defeated.

Further,

The frequency domain position of described demodulated reference signal is:

In a Resource Block, the interval of demodulated reference signal in an OFDM symbol of same transport layer or port is 5 or 9 subcarriers, and 2 subcarriers of the demodulated reference signal of described same transport layer or port in described Resource Block and OFDM symbol are uploaded defeated.

Further,

The frequency domain position of described demodulated reference signal is:

In a Resource Block, the interval of demodulated reference signal in an OFDM symbol of same transport layer or port is 5 subcarriers, and 2 subcarriers of the demodulated reference signal of described same transport layer or port in described Resource Block and OFDM symbol are uploaded defeated.

Further,

When the number of plies of described demodulated reference signal transmission or antenna port number are 2, the demodulated reference signal of different transport layer or antenna port carries out orthogonal multiplex by the mode of CDM or FDM;

When the number of plies that described demodulated reference signal transmits or antenna port number are greater than 2, the mode that the demodulated reference signal of different transport layer or antenna port is combined by CDM and FDM carries out orthogonal multiplex.

Further,

Described demodulated reference signal is when multiple antenna port transmits, and the demodulated reference signal of different antennae port is by FDM, or the mode that FDM and TDM combines carries out orthogonal multiplex.

Further,

Described emitter generates the sequence of described demodulated reference signal according to following methods:

Emitter generates the sequence of the public reference signal of each OFDM symbol according to the public reference signal pattern of downlink system bandwidth, subframe circulating prefix-length and common subframe;

The resource block location that emitter transmits according to described demodulated reference signal, gets the sequence of sequence corresponding to described Resource Block as the repeated link demodulated reference signal transmitted in the OFDM symbol l of described Resource Block from the public reference signal sequence corresponding to described OFDM symbol l.

For solving the problems of the technologies described above, the present invention also provides a kind of emitter, and described device comprises:

Memory module, for storing described demodulated reference signal pattern, wherein the time-domain position of demodulated reference signal is that receiving system can receive and not by one or more OFDMs (OFDM) symbol that public reference signal takies;

Transport module, sends demodulated reference signal for the demodulated reference signal pattern stored according to described memory module.

Further,

When subframe has general cyclic prefix (CP) length, the time-domain position of described demodulated reference signal is the 6th, 7 OFDM symbol; When subframe has expansion CP length, the time-domain position of described demodulated reference signal is the 5th, 6 OFDM symbol.

Further,

When subframe has general cyclic prefix (CP) length, the time-domain position of described demodulated reference signal is the 6th, 7,13,14 OFDM symbol; When subframe has expansion CP length, the time-domain position of described demodulated reference signal is the 5th, 6,11,12 OFDM symbol;

Further,

When subframe has common CP length, the time-domain position of described demodulated reference signal is the 5th, 8,9 or the 5th, 8 OFDM symbol of subframe; When subframe has expansion CP length, the time-domain position of described demodulated reference signal is the 4th, 7,8 or the 4th, 7 or the 7th, 8 or the 7th OFDM symbol of subframe; Described subframe is MBSFN sub-frame.

Further,

When described subframe is common subframe, when subframe has common CP length, the time-domain position of described demodulated reference signal is the 6th OFDM symbol of subframe; When subframe has expansion CP length, the time-domain position of described demodulated reference signal is the 5th OFDM symbol of subframe;

When described subframe is MBSFN sub-frame, when subframe has common CP length, the time-domain position of described demodulated reference signal is the 5th, 6 or the 5th, 6,8,9 OFDM symbol of subframe; When subframe has expansion CP length, the time-domain position of described demodulated reference signal is the 4th, 5 or the 5th, 7 or the 4th, 5,7,8 or the 5th, 7,8 OFDM symbol of subframe.

Further,

The frequency domain position of described demodulated reference signal is:

In a Resource Block, the interval of demodulated reference signal in an OFDM symbol of same transport layer or port is 2 subcarriers, and 4 subcarriers of the demodulated reference signal of described same transport layer or port in described Resource Block and OFDM symbol are uploaded defeated; Or

In a Resource Block, the interval of demodulated reference signal in an OFDM symbol of same transport layer or port is 4 subcarriers, and 3 subcarriers of the demodulated reference signal of described same transport layer or port in described Resource Block and OFDM symbol are uploaded defeated.

Further,

The frequency domain position of described demodulated reference signal is:

In a Resource Block, the interval of demodulated reference signal in an OFDM symbol of same transport layer or port is 5 or 9 subcarriers, and 2 subcarriers of the demodulated reference signal of described same transport layer or port in described Resource Block and OFDM symbol are uploaded defeated.

Further,

The frequency domain position of described demodulated reference signal is:

In a Resource Block, the interval of demodulated reference signal in an OFDM symbol of same transport layer or port is 5 subcarriers, and 2 subcarriers of the demodulated reference signal of described same transport layer or port in described Resource Block and OFDM symbol are uploaded defeated.

Further,

Emitter also comprises public reference signal sequence generating module and demodulated reference signal sequence generating module, wherein,

Public reference signal sequence generating module is used for the sequence generating the public reference signal of each OFDM symbol according to the public reference signal pattern of downlink system bandwidth, subframe circulating prefix-length and common subframe;

Demodulated reference signal sequence generating module is used for the resource block location transmitted according to described demodulated reference signal, gets the sequence of sequence corresponding to described Resource Block as the repeated link demodulated reference signal transmitted in the OFDM symbol l of described Resource Block from the public reference signal sequence corresponding to described OFDM symbol l.

For solving the problems of the technologies described above, the present invention also provides a kind of receiving system, and described device comprises:

Receiver module, for receiving and resolving demodulated reference signal, wherein the time-domain position of demodulated reference signal is that receiving system can receive and not by one or more OFDMs (OFDM) symbol that public reference signal takies;

Processing module, for carrying out the data demodulates of repeated link according to the downlink relay link demodulated reference signal received.

Demodulated reference signal sending method of the present invention and sending and receiving apparatus, solve the transmission problem of repeated link demodulated reference signal, and consider the expense of demodulated reference signal, ensure that there is a compromise preferably between the reliability that downlink data of relay link transmits and reference signal expense.Meanwhile, the demodulated reference signal transmission method that the present invention describes avoids conflicting of repeated link demodulated reference signal and public reference signal CRS.

Accompanying drawing explanation

Fig. 1 is the frame structure schematic diagram of LTE/LTE-A system;

Fig. 2 is resource structures figure under common CP length;

Fig. 3 is descending Relay subframe structure schematic diagram;

Fig. 4 is that the CRS in different subframe type transmits schematic diagram;

Fig. 5 is the demodulated reference signal pattern schematic diagram of the embodiment of the present invention 1;

Fig. 6 is the demodulated reference signal pattern schematic diagram of the embodiment of the present invention 1;

Fig. 7 is the demodulated reference signal pattern schematic diagram of the embodiment of the present invention 2;

Fig. 8 is the demodulated reference signal pattern schematic diagram of the embodiment of the present invention 2;

Fig. 9 is the demodulated reference signal pattern schematic diagram of the embodiment of the present invention 3;

Figure 10 is the demodulated reference signal pattern schematic diagram of the embodiment of the present invention 3;

Figure 11 is the demodulated reference signal pattern schematic diagram of the embodiment of the present invention 4;

Figure 12 is the demodulated reference signal pattern schematic diagram of the embodiment of the present invention 4;

Figure 13 is the demodulated reference signal pattern schematic diagram of the embodiment of the present invention 4;

Figure 14 is the demodulated reference signal pattern schematic diagram of the embodiment of the present invention 4;

Figure 15 is the demodulated reference signal pattern schematic diagram of the embodiment of the present invention 5;

Figure 16 is the demodulated reference signal pattern schematic diagram of the embodiment of the present invention 5;

Figure 17 is the demodulated reference signal pattern schematic diagram of the embodiment of the present invention 5;

Figure 18 is the demodulated reference signal pattern schematic diagram of the embodiment of the present invention 5;

Figure 19 is the demodulated reference signal pattern schematic diagram of the embodiment of the present invention 5;

Figure 20 is the demodulated reference signal pattern schematic diagram of the embodiment of the present invention 6;

Figure 21 is the demodulated reference signal pattern schematic diagram of the embodiment of the present invention 6;

Figure 22 is the demodulated reference signal pattern schematic diagram of the embodiment of the present invention 6;

Figure 23 is the demodulated reference signal pattern schematic diagram of the embodiment of the present invention 6;

Figure 24 is the demodulated reference signal pattern schematic diagram of the embodiment of the present invention 7;

Figure 25 is the demodulated reference signal pattern schematic diagram of the embodiment of the present invention 7;

Figure 26 is the demodulated reference signal pattern schematic diagram of the embodiment of the present invention 7.

Embodiment

The main thought of demodulated reference signal sending method of the present invention, transmitting and receiving system is, in demodulated reference signal pattern, the time-domain position of described demodulated reference signal transmission is that receiving system can receive and not by one or more OFDMs (OFDM) symbol that public reference signal takies.

The sending method of demodulated reference signal of the present invention is:

Emitter sends demodulated reference signal according to the pattern of demodulated reference signal, in described pattern, the time-domain position of demodulated reference signal is that receiving system can receive and not by one or more OFDMs (OFDM) symbol that public reference signal takies;

The present invention gives three class settling modes for demodulated reference signal pattern:

One, for repeated link design is different from the demodulated reference signal pattern of LTE public reference signal (CRS) pattern.

Such as, when subframe has common CP length, 6th, 7 OFDM symbol of described demodulated reference signal in subframe is transmitted; When subframe has expansion CP length, 5th, 6 OFDM of described demodulated reference signal in subframe transmits.Refer to subsequent embodiment 1 to embodiment 5.

Two, in part resource, the LTE CRS pattern of common subframe is reused as demodulated reference signal pattern.

If namely repeated link transfer of data occurs in MBSFN sub-frame, design demodulated reference signal transmits in the burst, and the demodulated reference signal pattern of transmission is identical with the CRS pattern of respective resources location transmission in common subframe.Such as, if demodulated reference signal is used for the demodulation of repeated link control data, when subframe has common CP length, in MBSFN sub-frame for the RB of described repeated link control data transmission to the transmission demodulated reference signal in the interior the 5th, 8 OFDM symbol, described demodulated reference signal has identical pattern with the CRS that the 5th, 8 OFDM symbol in common subframe is transmitted.Refer to subsequent embodiment 6.

Three, on the basis of CRS, demodulated reference signal is increased.

Such as, the subframe of suppose relay link data transfer is common subframe (non-MBSFN sub-frame), if relay link downlink control information is only transmitted in first time slot of relay sub-frame, and the CRS of port 2 and 3 in the resource transmitting described Downlink Control Information in first time slot, may be there is no.In order to ensure reliability during relay link downlink control information 4 port transmission, the demodulated reference signal of two ports can be transmitted in the resource of relay link downlink control information transmission, the demodulated reference signal of two ports transmits at the port 2 of transmission CRS and port 3 respectively, demodulated reference signal together with former CRS as the demodulated reference signal of R-PDCCH.Refer to subsequent embodiment 7.

Demodulated reference signal of the present invention is used for the coherent demodulation of downlink data of relay link transmission, and the Resource Block only transmitted at described downlink data of relay link internally transmits; It can transmit in the MBSFN subframe, also can transmission in common subframe (non-MBSFN sub-frame).

Described downlink data can be relay link downlink control information, i.e. the information that repeated link scheduling, Resourse Distribute etc. are relevant; Also it can be relay link downlink business datum (namely the demodulated reference signal as embodiment 5 can be used for the demodulation of business datum).

Described demodulated reference signal is when multiple transport layer or antenna port transmission, and the demodulated reference signal of different layers or port carries out orthogonal multiplex by the mode of one or more combinations in frequency division multiplex FDM, time division multiplexing TDM or code division multiplex CDM.

When the number of plies of described demodulated reference signal transmission or antenna port number are 2, the demodulated reference signal of different transport layer or antenna port carries out orthogonal multiplex by the mode of CDM or FDM;

When the number of plies that described demodulated reference signal transmits or antenna port number are greater than 2, the mode that the demodulated reference signal of different transport layer or antenna port is combined by CDM and FDM carries out orthogonal multiplex.

Described demodulated reference signal is when multiple antenna port transmits, and the demodulated reference signal of different antennae port is by FDM, or the mode that FDM and TDM combines carries out orthogonal multiplex.

By above method, solve the transmission problem of repeated link demodulated reference signal, consider the expense of demodulated reference signal simultaneously, ensure that between the reliability that downlink data of relay link transmits and reference signal expense, there is a compromise preferably, and avoid conflicting of repeated link demodulated reference signal and public reference signal CRS.

Below in conjunction with drawings and Examples, demodulated reference signal pattern is described in detail:

Embodiment 1

In this example, suppose that demodulated reference signal that the present invention describes is used for the demodulation of relay link downlink control information, and the control information of suppose relay downlink is transmitted the part RB centering of relay sub-frame, and take described RB to the part in the interior OFDM symbol transmitted to relay station for base station.Described control information is the information that repeated link scheduling, Resourse Distribute etc. are relevant.

In this example, the design principle of demodulated reference signal pattern is, the OFDM symbol shared by not transmitted by CRS in the OFDM symbol that the time-domain position of demodulated reference signal transmission can receive for relay station.Concrete, demodulated reference signal transmits in 2 OFDM symbol.In a Resource Block, the demodulated reference signal of same transport layer or port is spaced apart 4 subcarriers in an OFDM symbol, and 3 subcarriers of the demodulated reference signal of same transport layer or port in an OFDM symbol are uploaded defeated, concrete frequency domain position be 1,6,11} or 2,7, a 12} subcarrier.

Under the hypothesis of the present embodiment, support the demodulated reference signal pattern of 1 port transmission under common CP length as shown in Figure 5, concrete, the frequency domain position that demodulated reference signal maps in a RB be the 1,6, a 11} subcarrier; The time-domain position mapped in subframe be 6, a 7} OFDM symbol.

Pattern shown in Fig. 5 also can support 2 ports/layer transmission simultaneously.Pattern during 2 port/layer transmission is identical with pattern during 1 port transmission, just adopts the mode of CDM orthogonal spectrum expansion to carry out the orthogonal multiplex of different port/layer demodulated reference signal.Wherein the RE of two demodulated reference signals that time domain is adjacent is as a spectrum-spreading unit (as shown in the ellipse in Fig. 5), length is used to be that the Walsh orthogonal code of 2 is as spreading code, the such as spreading code of two port/layers is taken as [1,1] and [1 ,-1] respectively.

Under the hypothesis of the present embodiment, under expansion CP length, an example of demodulated reference signal pattern as shown in Figure 6.The frequency domain position that demodulated reference signal maps in a RB be 1,6, a 11} subcarrier; The time-domain position mapped in subframe be 5, a 6} OFDM symbol.The multiplex mode of two port/layer demodulated reference signals is identical with the situation of common CP length, repeats no more here.

Embodiment 2

Under the hypothesis of embodiment 1 and the design principle of demodulated reference signal pattern, support at most the demodulated reference signal pattern example of 4 ports/layer transmission when subframe has common CP length as shown in Figure 7.Be specially, during two-port/layer transmission, the multiplex mode of two port/layer demodulated reference signals is identical with embodiment 1, repeats no more here, demodulated reference signal is when 4 ports/transport layer transmission, described port/transport layer is divided into two groups, the demodulated reference signal of two ports often in group/layer transmission adopts multiplex mode identical when transmitting with two-port/layer, namely the mode of CDM orthogonal spectrum expansion is adopted to ensure that the demodulated reference signal of two port/layers is orthogonal, wherein the RE of two demodulated reference signals that time domain is adjacent is as a spectrum-spreading unit, spread spectrum mode is identical with embodiment 1, demodulated reference signal between two groups adopts the mode of FDM to keep orthogonal, such as two group demodulated reference signal respectively in a RB { 1, 6, 11} and { 2, 7, 12} subcarrier is uploaded defeated.

Under the hypothesis of the present embodiment, subframe have expansion CP length time demodulated reference signal pattern example as shown in Figure 8, demodulated reference signal in subframe 5, a 6} OFDM symbol is transmitted, other frequency domain position is identical with the situation under common CP length with multiplex mode etc., repeats no more here.

Equally, the spectrum-spreading unit when ellipse representation CDM in Fig. 7 and 8 is multiplexing.

Embodiment 3

Under the hypothesis of embodiment 1, the design principle of the demodulated reference signal pattern in this example is, in a RB, the demodulated reference signal of same transport layer or port is spaced apart 2 subcarriers at frequency domain, and 4 subcarriers of the demodulated reference signal of same transport layer or port in an OFDM symbol are uploaded defeated, concrete frequency domain position be 2,5,8,11} or 1,4,7,10} or 3,6,9, a 12} subcarrier, in time domain, the transmission location of demodulated reference signal is identical with embodiment 1.

Under the hypothesis of the present embodiment, support the demodulated reference signal pattern of 1 port transmission under common CP length as shown in Figure 9, concrete, the frequency domain position that demodulated reference signal maps in a RB be the 2,5,8, a 11} subcarrier; The time-domain position mapped in subframe be 6, a 7} OFDM symbol.Pattern shown in Fig. 9 also can support 2 ports/layer transmission simultaneously.The mode of CDM orthogonal spectrum expansion is adopted to carry out the orthogonal multiplex of different port/layer demodulated reference signal during two-port/layer transmission.Wherein the RE of two demodulated reference signals that time domain is adjacent is as a spectrum-spreading unit (as shown in the ellipse in Fig. 9), use length be the Walsh orthogonal code of 2 as spreading code, the such as spreading code of two ports is taken as [1,1] and [1 ,-1] respectively.

Under the hypothesis of the present embodiment, under expansion CP length, an example of demodulated reference signal pattern as shown in Figure 10.The frequency domain position that demodulated reference signal maps in a RB be 2,5,8, a 11} subcarrier; The time-domain position mapped in subframe be 5, a 6} OFDM symbol.The multiplex mode of two port/layer demodulated reference signals is identical with the situation of common CP length, repeats no more here.

Embodiment 4

In this example, suppose that demodulated reference signal that the present invention describes is used for the demodulation of relay link downlink control information, and suppose that described Downlink Control Information transmits the part RB centering of relay sub-frame, and take described RB to the interior whole OFDM symbol transmitted to relay station for base station.Described control information is the information that repeated link scheduling, Resourse Distribute etc. are relevant.

In this example, the design principle of demodulated reference signal pattern is, the OFDM symbol shared by not transmitted by CRS in the OFDM symbol that the time-domain position of demodulated reference signal transmission can receive for relay station.Concrete, demodulated reference signal transmits in 4 OFDM symbol.In a Resource Block, the demodulated reference signal of same transport layer or port is spaced apart 9 subcarriers in an OFDM symbol, and 2 subcarriers of the demodulated reference signal of same transport layer or port in an OFDM symbol are uploaded defeated, concrete frequency domain position be 1,11} or 2, a 12} subcarrier.

Under the hypothesis of the present embodiment, support the demodulated reference signal pattern of two-port/layer transmission under common CP length as shown in figure 11.Concrete, the demodulated reference signal of two port/layers adopts the mode of FDM to carry out orthogonal multiplex.The frequency domain position that the reference signal of two port/layers maps in a RB be respectively 1,11} and 2, a 12} subcarrier; The time-domain position mapped in subframe be 6,7,13, a 14} OFDM symbol.

Under the hypothesis of the present embodiment, under expansion CP length, an example of demodulated reference signal pattern as shown in figure 12.Concrete, the demodulated reference signal of two port/layers adopts the mode of FDM to carry out orthogonal multiplex.The frequency domain position that the reference signal of two port/layers maps in a RB be respectively 1,11} and 2, a 12} subcarrier; The time-domain position mapped in subframe be 5,6,11, a 12} OFDM symbol.

In this example, in a Resource Block, the interval of the demodulated reference signal of same transport layer or port in an OFDM symbol also can be 5 subcarriers, and 2 subcarriers of the demodulated reference signal of same transport layer or port in an OFDM symbol are uploaded defeated, concrete frequency domain position be 3,9} or 4, a 10} subcarrier, common CP length and the demodulated reference signal pattern example under expanding CP length as shown in Figs. 13 and 14, repeat no more.

In this example, if the transmission of Downlink Control Information takies the part OFDM symbol transmitted to relay station for base station in relay sub-frame, the demodulated reference signal that so the present invention describes also can only transmit in two OFDM symbol, lower of such as common CP length the 6, a 7} OFDM symbol is transmitted, lower of expansion CP length the 5, a 6} OFDM symbol is transmitted; The multiplex mode of described demodulated reference signal and frequency domain position as hereinbefore, repeat no more.

Embodiment 5

In this example, the design principle of demodulated reference signal pattern is, the OFDM symbol shared by not transmitted by CRS in the OFDM symbol that the time-domain position of demodulated reference signal transmission can receive for relay station.Concrete, demodulated reference signal transmits in 4 OFDM symbol.In a Resource Block, the demodulated reference signal of same transport layer or port is spaced apart 9 subcarriers in an OFDM symbol, and 2 subcarriers of the demodulated reference signal of same transport layer port in an OFDM symbol are uploaded defeated, concrete frequency domain position be 1,11} or 2, a 12} subcarrier.

Under the hypothesis of the present embodiment, support the demodulated reference signal pattern of 4 port/4 layer transmission under common CP length as shown in figure 15, concrete, the frequency domain position that demodulated reference signal maps in a RB be the 1, a 11} subcarrier; The time-domain position mapped in subframe be 6,7,13, a 14} OFDM symbol.Pattern when pattern when 2 port/2 layer are transmitted transmits with 1 port/1 layer is identical, just adopts the mode of CDM orthogonal spectrum expansion to carry out the orthogonal multiplex of different port/layer demodulated reference signal.Wherein the RE of two demodulated reference signals that time domain is adjacent is as a spectrum-spreading unit (as shown in the ellipse in Figure 15), length is used to be that the Walsh orthogonal code of 2 is as spreading code, the such as spreading code of two port/layers is taken as [1,1] and [1 ,-1] respectively.When 4 port/4 layer are transmitted, described port/layer is divided into two groups, the demodulated reference signal of two ports often in group/layer transmission adopts multiplex mode identical when transmitting with two-port, namely the mode of CDM orthogonal spectrum expansion is adopted to ensure that the demodulated reference signal of two port/layers is orthogonal, wherein the RE of two demodulated reference signals that time domain is adjacent is as a spectrum-spreading unit, demodulated reference signal between two groups adopts the mode of FDM to carry out orthogonal multiplex, such as the demodulated reference signal of two groups respectively in a RB 1,11} and 2, a 12} subcarrier uploads defeated.

Under the hypothesis of the present embodiment, under expansion CP length, an example of demodulated reference signal pattern as shown in figure 16.Identical when the frequency domain position that demodulated reference signal maps in a RB and common CP length; The time-domain position mapped in subframe be 5,6,11, a 12} OFDM symbol.The multiplex mode of multiport/multilayer demodulated reference signal is identical with the situation of common CP length, repeats no more here.

The demodulated reference signal described in this example also can support 8 layers of transmission.Identical with the pattern of the demodulated reference signal that 4 layers transmit during 8 layers of transmission.Be specially, transport layer be divided into two groups, the demodulated reference signal of the transport layer in each group adopts the mode of CDM orthogonal spectrum expansion to carry out orthogonal multiplex, adopts the mode of FDM to carry out orthogonal multiplex between two groups.The mode of CDM orthogonal multiplex is, a RB carries out orthogonal spectrum expansion to 4 demodulated reference signal RE on interior same subcarrier as a spectrum-spreading unit, and the pattern example under common CP length as shown in figure 17.Each layer uses length to be that the Walsh code of 4 is as orthogonal intersection.Such as spreading code is taken as

$\left\{\begin{array}{c}\left[\mathrm{1,1,1,1}\right]\\ [1,-\mathrm{1,1},-1]\\ [\mathrm{1,1},-1,-1]\\ [1,-1,-1,1]\end{array}\right..$

Demodulated reference signal under expansion CP length adopts same processing method, repeats no more here.

Under the hypothesis of this example, the interval of demodulated reference signal in an OFDM symbol of same port also can be 5 subcarriers.The demodulated reference signal pattern of 4 layers of transmission is supported respectively as shown in Figures 18 and 19 under common CP length and expansion CP length.Support that 8 layers of demodulated reference signal pattern transmitted can similarly obtain, repeat no more here.

It should be noted that the CRS pattern just schematically describing LTE system in the schematic diagram of above embodiment 1 to embodiment 5, and do not represent the corresponding relation between CRS port number and demodulated reference signal port number/number of plies.And when base station uses MBSFN sub-frame to relay station transmission data, in the OFDM symbol after the 3rd OFDM symbol of MBSFN sub-frame, CRS may will be there is not.

Demodulated reference signal in embodiment 1 to embodiment 5 is applicable to transmit in common subframe (non-MBSFN sub-frame) and MBSFN sub-frame simultaneously.It should be noted that, demodulated reference signal in embodiment 1 to embodiment 4 is used for the correlation demodulation of relay link downlink control information, and namely the demodulated reference signal in embodiment 5 may be used for the coherent demodulation of relay link downlink control information, also may be used for the coherent demodulation of relay link downlink business information.

Embodiment 6

In this example, suppose that demodulated reference signal that the present invention describes is used for the demodulation of relay link downlink control information, and the control information of suppose relay downlink is transmitted the part RB centering of relay sub-frame, and take described RB to the part in the interior OFDM symbol transmitted to relay station for base station.Described control information is the information that repeated link scheduling, Resourse Distribute etc. are relevant.

In this example, relay link downlink control information can be transmitted in common subframe (non-MBSFN sub-frame) or MBSFN sub-frame.When transmitting in common subframe, CRS is used to carry out coherent demodulation; When MBSFN sub-frame is transmitted, according to the protocol specification of LTE Rel-8, in the resource that base station is transmitted to relay station, CRS can not be there is, as shown in the right figure of Fig. 4.

Demodulated reference signal in this example is used for the coherent demodulation of relay link downlink control information when MBSFN sub-frame is transmitted.If namely base station uses MBSFN sub-frame to relay station control information transmission, the RB transmitted for described control information is in the MBSFN subframe to interior transmission demodulated reference signal.Concrete, the demodulated reference signal described in this example reuses the pattern of the CRS of common subframe in the part OFDM symbol that described RB is right.

In this example, the port number of agreement demodulated reference signal is identical with the CRS port number of base-station transmission.The CRS of such as base-station transmission is 4 port (CRS port numberings 0 ~ 3, lower same), also be so 4 ports at the demodulated reference signal of MBSFN sub-frame base-station transmission, demodulated reference signal pattern under common CP length as shown in figure 20, namely 5th, 8,9 OFDM symbol of demodulated reference signal in MBSFN sub-frame is transmitted and lays equal stress on the CRS pattern of the common subframe in respective symbol.Demodulated reference signal pattern under expansion CP length as shown in figure 21, namely 4th, 7,8 OFDM symbol of demodulated reference signal in MBSFN sub-frame is transmitted.If relay station does not receive the 4th OFDM symbol of base-station transmission under expansion CP length, so demodulated reference signal only transmits in the 7th, 8 OFDM symbol.If the CRS of base-station transmission is 1 or 2 port, also be so 1 or 2 port at the demodulated reference signal of MBSFN sub-frame base-station transmission, namely in the 5th, 8 OFDM symbol of demodulated reference signal in MBSFN sub-frame, transmission is laid equal stress on the CRS pattern of the common subframe in respective symbol, as shown in figure 22.Under expansion CP length, described demodulated reference signal transmits in the 4th, 7 OFDM symbol, as shown in figure 23; If relay station does not receive the 4th OFDM symbol of base-station transmission, so demodulated reference signal only transmits in the 7th OFDM symbol.

In this example, the port number of demodulated reference signal transmission can also be limited.Such as, as the CRS of base-station transmission 1 or 2 port, the demodulated reference signal of transmission is also 1 or 2 ports; When the CRS of base-station transmission is 4 ports, the demodulated reference signal of transmission is defined as 2 ports.Demodulated reference signal pattern under common CP length still as shown in figure 22.Demodulated reference signal pattern under expansion CP length still as shown in figure 23.If relay station does not receive the 4th OFDM symbol of base-station transmission under expansion CP length, so demodulated reference signal only transmits in the 7th OFDM symbol.

Embodiment 7

In this example, suppose that demodulated reference signal that the present invention describes is used for the demodulation of relay link downlink control information, and the control information of suppose relay downlink is transmitted the part RB centering of relay sub-frame, and take described RB to the part in the interior OFDM symbol transmitted to relay station for base station.Described control information is the information that repeated link scheduling, Resourse Distribute etc. are relevant.

In this example, described relay link downlink control information can be transmitted in common subframe (non-MBSFN sub-frame) or MBSFN sub-frame.When transmitting in common subframe, if the CRS of base-station transmission is 1 or 2 ports, so relay station uses CRS to carry out the demodulation of R-PDCCH; If the CRS of base-station transmission is 4 ports, so due to CRS port 2 or 3 may do not had in relay link downlink control domain, in relay link downlink control domain, so transmit the demodulated reference signal of 2 ports, the demodulated reference signal of two ports transmits at the port 2 of transmission CRS and port 3 respectively, to reach the object making relay link downlink control information transmit support 4 antenna diversity.The pattern example of the demodulated reference signal transmission under common CP length as shown in figure 24.Wherein demodulated reference signal is arranged in the 6th OFDM symbol, and the sub-carrier positions of demodulated reference signal in a RB and the 2nd OFDM symbol middle port 2 in this subframe are identical with the sub-carrier positions transmitted of CRS of 3.Under expansion CP length, demodulated reference signal is arranged in the 5th OFDM symbol, and other are identical with the situation of common CP length, repeat no more here.The demodulated reference signal of 2 ports described herein only at the RB of R-PDCCH transmission to interior transmission, be the downlink demodulation reference signals of relay link that the present invention describes.

In the present embodiment, CRS and demodulated reference signal one are used from coherent demodulation when R-PDCCH tetra-antenna transmit diversity transmits.

If relay link downlink control information is transmitted in the MBSFN subframe, the demodulated reference signal so for relay link downlink control information demodulation has identical pattern with the aforementioned CRS that transmits in common subframe and demodulated reference signal.Namely, under common CP length, if CRS adopts 1 or 2 port transmission, demodulated reference signal transmits in the 5th OFDM symbol; If CRS adopts 4 port transmission, demodulated reference signal transmits on the 5th and 6 OFDM symbol, and sub-carrier positions is identical with the sub-carrier positions of demodulated reference signal with the CRS transmitted in the 5th with the 6th OFDM symbol in common subframe, as shown in figure 25.Under expansion CP length, the OFDM symbol of demodulated reference signal transmission is the 4th, 5 OFDM symbol, and other are identical with the situation of common CP length, repeat no more here.If relay station does not receive the 4th OFDM symbol, demodulated reference signal can be transmitted in the 5th, 7 OFDM symbol.Demodulated reference signal described herein is only in the RB centering transmission of relay link downlink control information transmission.

Under the hypothesis of this example, also the demodulation of the repeated link control information transmitted in MBSFN sub-frame can be used for the demodulated reference signal pattern shown in Figure 26, namely on the basis of pattern shown in Figure 25, be increased in the 8th, 9 OFDM symbol simultaneously and transmit demodulated reference signal, described demodulated reference signal reuses the CRS pattern of common subframe equally.Under expansion CP length, demodulated reference signal can be transmitted on the 4th, 5,7,8 symbol, if relay station does not receive the 4th OFDM symbol, so only can transmit demodulated reference signal on the 5th, 7,8 symbol, repeat no more.

Should be appreciated that the demodulated reference signal pattern in each embodiment just plays description and explains object of the present invention, and also paired not restriction of the present invention.

In order to realize above method, present invention also offers a kind of emitter, this device comprises:

Memory module, for storing described demodulated reference signal pattern, wherein the time-domain position of demodulated reference signal is that receiving system can receive and not by one or more OFDMs (OFDM) symbol that public reference signal takies;

Concrete, demodulated reference signal pattern is identical with the description in above embodiment 1-7, does not repeat them here.

Transport module, sends described demodulated reference signal for the demodulated reference signal pattern stored according to described memory module.

In addition, present invention also offers a kind of receiving system, comprising:

Receiver module, for receiving and resolving demodulated reference signal, wherein the time-domain position of demodulated reference signal is that receiving system can receive and not by one or more OFDMs (OFDM) symbol that public reference signal takies;

Concrete, demodulated reference signal pattern is identical with the description in above embodiment 1-7, does not repeat them here.

Processing module, for carrying out the data demodulates of repeated link according to the downlink relay link demodulated reference signal received.

Invention also provides a kind of generation method of demodulated reference signal sequence, particularly, the method is applicable to the situation that demodulated reference signal reuses CRS pattern, comprising:

Steps A, base station generate the sequence of the public reference signal of each OFDM symbol according to the CRS pattern of downlink system bandwidth, subframe circulating prefix-length and common subframe;

Step B, the resource block location transmitted according to described demodulated reference signal, get the sequence of sequence corresponding to described Resource Block as the repeated link demodulated reference signal transmitted in the OFDM symbol l of described Resource Block from the public reference signal sequence corresponding to described OFDM symbol l.

The generating mode of public reference signal sequence as described herein is identical with LTE Rel-8 system.

Such as suppose that demodulated reference signal transmits in the MBSFN subframe, and demodulated reference signal reuses the CRS pattern of common subframe in the part or all of OFDM symbol of part RB centering, in CRS sequence, so get sequence corresponding to corresponding RB and OFDM symbol (namely having the OFDM symbol that demodulated reference signal transmits) as the sequence of the above-mentioned demodulated reference signal transmitted in the MBSFN subframe.

In LTE system, the generation formula of CRS sequence is:

$r_{{l,n}_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),m=\mathrm{0,1},...,{2N}_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

Wherein l is the OFDM symbol numbering in time slot, n _sbe the time-gap number in radio frames, c () is the pseudo random sequence defined in LTE protocol, it is maximum available RB number in downlink system bandwidth.This sequence generates formula has detailed explanation in LTE Rel-8 agreement, repeats no more here.From above formula, in LTE system, in the OFDM symbol transmitted there being CRS, the CRS of a port takies 2 RE in a RB.Such as be numbered i for descending rB, the CRS sequence that some day, line cap transmitted on the OFDM symbol l of this RB is { r _{l, ns}(2i), r _{l, ns}(2i+1) }.

If transmission in the part RB of demodulated reference signal on the OFDM symbol l of MBSFN sub-frame and reuse the CRS pattern of common this OFDM symbol (l) of subframe in described part RB, in so corresponding in the RB that described demodulated reference signal transmits OFDM symbol l, the sequence of the demodulated reference signal of certain Single port is { r _{l, ns}(2i), r _{l, ns}(2i+1) }, wherein i for the numbering of this RB in downlink system bandwidth, as aforementioned definitions.

Should be appreciated that the demodulated reference signal sequence described in this example just plays describe and explain object of the present invention, and also paired not restriction of the present invention.

In order to realize above demodulated reference signal sequence generating method, emitter of the present invention also comprises public reference signal sequence generating module and demodulated reference signal sequence generating module, wherein,

Public reference signal sequence generating module is used for the sequence generating the public reference signal of each OFDM symbol according to the CRS pattern of downlink system bandwidth, subframe circulating prefix-length and common subframe;

Demodulated reference signal sequence generating module is used for the resource block location transmitted according to described demodulated reference signal, gets the sequence of sequence corresponding to described Resource Block as the repeated link demodulated reference signal transmitted in the OFDM symbol l of described Resource Block from the public reference signal sequence corresponding to described OFDM symbol l.

Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

In sum, by above method, solve the transmission problem of repeated link demodulated reference signal, consider the expense of demodulated reference signal simultaneously, ensure that between the reliability that downlink data of relay link transmits and reference signal expense, there is a compromise preferably, and avoid conflicting of repeated link demodulated reference signal and public reference signal CRS.

Claims (16)

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

Emitter sends demodulated reference signal according to demodulated reference signal pattern, in described demodulated reference signal pattern, the time-domain position of demodulated reference signal is that receiving system can receive and not by one or more OFDMs (OFDM) symbol that public reference signal takies; Described demodulated reference signal is used for the coherent demodulation of downlink data of relay link transmission;

The frequency domain position of described demodulated reference signal is:

In a Resource Block, the interval of demodulated reference signal in an OFDM symbol of same transport layer or port is 5 subcarriers, and 2 subcarriers of the demodulated reference signal of described same transport layer or port in described Resource Block and OFDM symbol are uploaded defeated;

When subframe has common CP length, the time-domain position of described demodulated reference signal is the 5th, 8,9 or the 5th, 8 OFDM symbol of subframe; When subframe has expansion CP length, the time-domain position of described demodulated reference signal is the 4th, 7,8 or the 4th, 7 or the 7th, 8 or the 7th OFDM symbol of subframe; Described subframe is MBSFN sub-frame;

Or,

When subframe is common subframe, when subframe has common CP length, the time-domain position of described demodulated reference signal is the 6th OFDM symbol of subframe; When subframe has expansion CP length, the time-domain position of described demodulated reference signal is the 5th OFDM symbol of subframe; When described subframe is MBSFN sub-frame, when subframe has common CP length, the time-domain position of described demodulated reference signal is the 5th, 6 or the 5th, 6,8,9 OFDM symbol of subframe; When subframe has expansion CP length, the time-domain position of described demodulated reference signal is the 4th, 5 or the 5th, 7 or the 4th, 5,7,8 or the 5th, 7,8 OFDM symbol of subframe.

2. the method for claim 1, is characterized in that:

When subframe has general cyclic prefix (CP) length, the time-domain position of described demodulated reference signal is the 6th, 7 OFDM symbol; When subframe has expansion CP length, the time-domain position of described demodulated reference signal is the 5th, 6 OFDM symbol.

3. the method for claim 1, is characterized in that:

When subframe has general cyclic prefix (CP) length, the time-domain position of described demodulated reference signal is the 6th, 7,13,14 OFDM symbol; When subframe has expansion CP length, the time-domain position of described demodulated reference signal is the 5th, 6,11,12 OFDM symbol.

4. method as claimed in claim 1 or 2, is characterized in that,

The frequency domain position of described demodulated reference signal is:

In a Resource Block, the interval of demodulated reference signal in an OFDM symbol of same transport layer or port is 2 subcarriers, and 4 subcarriers of the demodulated reference signal of described same transport layer or port in described Resource Block and OFDM symbol are uploaded defeated; Or

In a Resource Block, the interval of demodulated reference signal in an OFDM symbol of same transport layer or port is 4 subcarriers, and 3 subcarriers of the demodulated reference signal of described same transport layer or port in described Resource Block and OFDM symbol are uploaded defeated.

5. method as claimed any one in claims 1 to 3, is characterized in that,

The frequency domain position of described demodulated reference signal is:

In a Resource Block, the interval of demodulated reference signal in an OFDM symbol of same transport layer or port is 5 or 9 subcarriers, and 2 subcarriers of the demodulated reference signal of described same transport layer or port in described Resource Block and OFDM symbol are uploaded defeated.

6. the method for claim 1, is characterized in that:

When the number of plies of described demodulated reference signal transmission or antenna port number are 2, the demodulated reference signal of different transport layer or antenna port carries out orthogonal multiplex by the mode of CDM or FDM;

When the number of plies that described demodulated reference signal transmits or antenna port number are greater than 2, the mode that the demodulated reference signal of different transport layer or antenna port is combined by CDM and FDM carries out orthogonal multiplex.

7. the method for claim 1, is characterized in that:

Described demodulated reference signal is when multiple antenna port transmits, and the demodulated reference signal of different antennae port is by FDM, or the mode that FDM and TDM combines carries out orthogonal multiplex.

8. the method for claim 1, is characterized in that: described emitter generates the sequence of described demodulated reference signal according to following methods:

Emitter generates the sequence of the public reference signal of each OFDM symbol according to the public reference signal pattern of downlink system bandwidth, subframe circulating prefix-length and common subframe;

The resource block location that emitter transmits according to described demodulated reference signal, gets the sequence of sequence corresponding to described Resource Block as the repeated link demodulated reference signal transmitted in the OFDM symbol l of described Resource Block from the public reference signal sequence corresponding to described OFDM symbol l.

9. an emitter, is characterized in that, described device comprises:

Memory module, for storing demodulated reference signal pattern, wherein the time-domain position of demodulated reference signal is that receiving system can receive and not by one or more OFDMs (OFDM) symbol that public reference signal takies;

Transport module, sends demodulated reference signal for the demodulated reference signal pattern stored according to described memory module;

The frequency domain position of described demodulated reference signal is:

In a Resource Block, the interval of demodulated reference signal in an OFDM symbol of same transport layer or port is 5 subcarriers, and 2 subcarriers of the demodulated reference signal of described same transport layer or port in described Resource Block and OFDM symbol are uploaded defeated;

When subframe has common CP length, the time-domain position of described demodulated reference signal is the 5th, 8,9 or the 5th, 8 OFDM symbol of subframe; When subframe has expansion CP length, the time-domain position of described demodulated reference signal is the 4th, 7,8 or the 4th, 7 or the 7th, 8 or the 7th OFDM symbol of subframe; Described subframe is MBSFN sub-frame;

Or,

When subframe is common subframe, when subframe has common CP length, the time-domain position of described demodulated reference signal is the 6th OFDM symbol of subframe; When subframe has expansion CP length, the time-domain position of described demodulated reference signal is the 5th OFDM symbol of subframe; When described subframe is MBSFN sub-frame, when subframe has common CP length, the time-domain position of described demodulated reference signal is the 5th, 6 or the 5th, 6,8,9 OFDM symbol of subframe; When subframe has expansion CP length, the time-domain position of described demodulated reference signal is the 4th, 5 or the 5th, 7 or the 4th, 5,7,8 or the 5th, 7,8 OFDM symbol of subframe.

10. device as claimed in claim 9, is characterized in that:

When subframe has general cyclic prefix (CP) length, the time-domain position of described demodulated reference signal is the 6th, 7 OFDM symbol; When subframe has expansion CP length, the time-domain position of described demodulated reference signal is the 5th, 6 OFDM symbol.

11. devices as claimed in claim 9, is characterized in that:

When subframe has general cyclic prefix (CP) length, the time-domain position of described demodulated reference signal is the 6th, 7,13,14 OFDM symbol; When subframe has expansion CP length, the time-domain position of described demodulated reference signal is the 5th, 6,11,12 OFDM symbol.

12. devices as described in claim 9 or 10, is characterized in that,

The frequency domain position of described demodulated reference signal is:

In a Resource Block, the interval of demodulated reference signal in an OFDM symbol of same transport layer or port is 2 subcarriers, and 4 subcarriers of the demodulated reference signal of described same transport layer or port in described Resource Block and OFDM symbol are uploaded defeated; Or

In a Resource Block, the interval of demodulated reference signal in an OFDM symbol of same transport layer or port is 4 subcarriers, and 3 subcarriers of the demodulated reference signal of described same transport layer or port in described Resource Block and OFDM symbol are uploaded defeated.

13. devices according to any one of claim 9 to 11, is characterized in that,

The frequency domain position of described demodulated reference signal is:

In a Resource Block, the interval of demodulated reference signal in an OFDM symbol of same transport layer or port is 5 or 9 subcarriers, and 2 subcarriers of the demodulated reference signal of described same transport layer or port in described Resource Block and OFDM symbol are uploaded defeated.

14. devices as claimed in claim 9, is characterized in that:

Emitter also comprises public reference signal sequence generating module and demodulated reference signal sequence generating module, wherein,

Public reference signal sequence generating module is used for the sequence generating the public reference signal of each OFDM symbol according to the public reference signal pattern of downlink system bandwidth, subframe circulating prefix-length and common subframe;

Demodulated reference signal sequence generating module is used for the resource block location transmitted according to described demodulated reference signal, gets the sequence of sequence corresponding to described Resource Block as the repeated link demodulated reference signal transmitted in the OFDM symbol l of described Resource Block from the public reference signal sequence corresponding to described OFDM symbol l.

15. 1 kinds of receiving systems, is characterized in that, described device comprises:

Receiver module, for receiving and resolving demodulated reference signal, wherein the time-domain position of demodulated reference signal is that receiving system can receive and not by one or more OFDMs (OFDM) symbol that public reference signal takies;

Processing module, for carrying out the data demodulates of repeated link according to the downlink relay link demodulated reference signal received;

The frequency domain position of described demodulated reference signal is:

In a Resource Block, the interval of demodulated reference signal in an OFDM symbol of same transport layer or port is 5 subcarriers, and 2 subcarriers of the demodulated reference signal of described same transport layer or port in described Resource Block and OFDM symbol are uploaded defeated;

When subframe has common CP length, the time-domain position of described demodulated reference signal is the 5th, 8,9 or the 5th, 8 OFDM symbol of subframe; When subframe has expansion CP length, the time-domain position of described demodulated reference signal is the 4th, 7,8 or the 4th, 7 or the 7th, 8 or the 7th OFDM symbol of subframe; Described subframe is MBSFN sub-frame;

Or,

When subframe is common subframe, when subframe has common CP length, the time-domain position of described demodulated reference signal is the 6th OFDM symbol of subframe; When subframe has expansion CP length, the time-domain position of described demodulated reference signal is the 5th OFDM symbol of subframe; When described subframe is MBSFN sub-frame, when subframe has common CP length, the time-domain position of described demodulated reference signal is the 5th, 6 or the 5th, 6,8,9 OFDM symbol of subframe; When subframe has expansion CP length, the time-domain position of described demodulated reference signal is the 4th, 5 or the 5th, 7 or the 4th, 5,7,8 or the 5th, 7,8 OFDM symbol of subframe.

The generation method of 16. 1 kinds of demodulated reference signal sequences, it is characterized in that, the method comprises:

Emitter generates the sequence of the public reference signal of each OFDM symbol according to the CRS pattern of downlink system bandwidth, subframe circulating prefix-length and common subframe;

The resource block location that emitter transmits according to described demodulated reference signal, gets the sequence of sequence corresponding to described Resource Block as the repeated link demodulated reference signal transmitted in the OFDM symbol l of described Resource Block from the public reference signal sequence corresponding to described OFDM symbol l;

When subframe has common CP length, the time-domain position of described demodulated reference signal is the 5th, 8,9 or the 5th, 8 OFDM symbol of subframe; When subframe has expansion CP length, the time-domain position of described demodulated reference signal is the 4th, 7,8 or the 4th, 7 or the 7th, 8 or the 7th OFDM symbol of subframe; Described subframe is MBSFN sub-frame;

Or,

When subframe is common subframe, when subframe has common CP length, the time-domain position of described demodulated reference signal is the 6th OFDM symbol of subframe; When subframe has expansion CP length, the time-domain position of described demodulated reference signal is the 5th OFDM symbol of subframe; When described subframe is MBSFN sub-frame, when subframe has common CP length, the time-domain position of described demodulated reference signal is the 5th, 6 or the 5th, 6,8,9 OFDM symbol of subframe; When subframe has expansion CP length, the time-domain position of described demodulated reference signal is the 4th, 5 or the 5th, 7 or the 4th, 5,7,8 or the 5th, 7,8 OFDM symbol of subframe.