CN107733594A

CN107733594A - A kind of method for mapping resource of demodulated reference signal, base station and terminal

Info

Publication number: CN107733594A
Application number: CN201610653706.7A
Authority: CN
Inventors: 林祥利; 高雪娟; 潘学明
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2016-08-10
Filing date: 2016-08-10
Publication date: 2018-02-23
Anticipated expiration: 2036-08-10
Also published as: CN107733594B; WO2018028397A1

Abstract

The invention provides a kind of method for mapping resource of demodulated reference signal, base station and terminal, it is related to the technical field of communications applications, solve when TTI contraction in lengths, original pilot tone mapping mode can not make to contain DMRS in each TTI, the problem of so as to influence channel estimating performance.The method for mapping resource of the demodulated reference signal of the embodiment of the present invention includes：In each short transmission time interval TTI, at least one orthogonal frequency division multiplex OFDM symbol for not mapping public guide frequency CRS is chosen；Demodulated reference signal DMRS is mapped in selected OFDM symbol.The embodiment of the present invention can ensure to include DMRS in each TTI, and then substantially increase channel estimating performance when being demodulated the resource impact of reference signal.

Description

A kind of method for mapping resource of demodulated reference signal, base station and terminal

Technical field

The present invention relates to the technical field of communications applications, particularly relate to a kind of method for mapping resource of demodulated reference signal, Base station and terminal.

Background technology

With the development and change of mobile communication business demand, International Telecommunication Union (International Telecommunication Union, ITU) etc. it is multiple tissue higher user plane is both defined to future mobile communication system Delay performance requirement.One of the main method for shortening user's delay performance be reduce Transmission Time Interval (TTI, Transmission Time Interval) length.It is existing in Long Term Evolution (Long Term Evolution, LTE) system Some transmissions is all defined with TTI=1ms.When TTI contraction in lengths, the pilot number available for data demodulation subtracts Few, original pilot tone mapping mode can influence channel estimating performance.When shortening to two OFDM symbols, then original demodulation reference Signal (De Modulation Reference Signal, DMRS) method for mapping resource can not to contain in each TTI DMRS, channel estimating performance is produced and had a strong impact on, and limitation is produced to scheduling.But for short TTI downlink, use Family own reference signal needs to be redesigned, at present the resource impact of not clear and definite downlink user own reference signal Scheme.

The content of the invention

It is an object of the invention to provide a kind of method for mapping resource of demodulated reference signal, base station and terminal, to solve Certainly when TTI contraction in lengths, original pilot tone mapping mode can not make to contain DMRS in each TTI, estimate so as to influence channel The problem of counting performance.

To achieve these goals, the invention provides a kind of method for mapping resource of demodulated reference signal, including：

In each short transmission time interval TTI, at least one OFDM for not mapping public guide frequency CRS is chosen OFDM symbol；

Demodulated reference signal DMRS is mapped in selected OFDM symbol.

Wherein, described in each short transmission time interval TTI, selection is at least one not to map public guide frequency CRS just The step of handing over frequency division multiplex OFDM symbol includes：

If the time span of the short TTI is the time span corresponding to two OFDM symbols, in each short TTI In, choose an OFDM symbol for not mapping CRS.

Wherein, if the time span of the short TTI is the time span corresponding to two OFDM symbols, each In the short TTI, choose one do not map CRS OFDM symbol the step of include：

If each subframe includes 14 OFDM symbols, the 3rd OFDM symbol and the tenth is chosen in each subframe Three OFDM symbols；Or

The 3rd OFDM symbol and the 14th OFDM symbol are chosen in each subframe；Or

The 4th OFDM symbol and the 13rd OFDM symbol are chosen in each subframe；Or

The 4th OFDM symbol and the 14th OFDM symbol are chosen in each subframe；Or

The 13rd OFDM symbol is chosen in each subframe；Or

The 14th OFDM symbol is chosen in each subframe.

Wherein, the quantity of the antenna port of the DMRS is up to 4；

Described the step of demodulated reference signal DMRS is mapped in selected OFDM symbol, includes：

If using 1 resource block RB or 12 subcarriers as a unit on frequency domain, in selected each OFDM symbol In the 2nd subcarrier, the 3rd subcarrier, map DMRS in the 8th subcarrier and the 9th subcarrier；Or

The 2nd subcarrier, the 5th subcarrier, the 8th subcarrier in selected each OFDM symbol and the 12nd DMRS is mapped in subcarrier；Or

The 1st subcarrier, the 2nd subcarrier, the 9th subcarrier in selected each OFDM symbol and the 10th DMRS is mapped in subcarrier.

Wherein, the quantity of the antenna port of the DMRS is up to 8；

If using 1 RB or 12 subcarrier as a unit on frequency domain, the in selected each OFDM symbol the 2nd Individual subcarrier, the 3rd subcarrier, the 4th subcarrier, the 5th subcarrier, the 8th subcarrier, the 9th subcarrier, the 10th son DMRS is mapped in carrier wave and the 11st subcarrier；Or

The 1st subcarrier, the 2nd subcarrier, the 4th subcarrier, the 5th son in selected each OFDM symbol DMRS is mapped in carrier wave, the 7th subcarrier, the 8th subcarrier, the 11st subcarrier and the 12nd subcarrier；Or

The 1st subcarrier, the 2nd subcarrier, the 3rd subcarrier, the 4th son in selected each OFDM symbol DMRS is mapped in carrier wave, the 9th subcarrier, the 10th subcarrier, the 11st subcarrier and the 12nd subcarrier.

If the time span of the short TTI is the time span corresponding to seven OFDM symbols, according to DMRS antenna The maximum of the quantity of port, choose at least one orthogonal frequency division multiplex OFDM symbol for not mapping public guide frequency CRS.

Wherein, if the time span of the short TTI is the time span corresponding to seven OFDM symbols, basis The maximum of the quantity of DMRS antenna port, choose at least one orthogonal frequency division multiplex OFDM for not mapping public guide frequency CRS The step of symbol, includes：

If the quantity of DMRS antenna port is up to 4, in each short TTI, selection is at least one not to be mapped Public guide frequency CRS OFDM symbol.

Wherein, if the quantity of the antenna port of the DMRS is up to 4, in each short TTI, at least one is chosen It is individual do not map public guide frequency CRS OFDM symbol the step of include：

In each short TTI, the 3rd OFDM symbol and the 6th OFDM symbol are chosen；Or

In each short TTI, the 4th OFDM symbol and the 6th OFDM symbol are chosen；Or

In each short TTI, the 3rd OFDM symbol and the 7th OFDM symbol are chosen；Or

In each short TTI, the 4th OFDM symbol and the 7th OFDM symbol are chosen；Or

In each short TTI, the 6th OFDM symbol is chosen；Or

In each short TTI, the 7th OFDM symbol is chosen.

If the quantity of DMRS antenna port is up to 8, in each short TTI, chooses at least two and do not map Public guide frequency CRS OFDM symbol.

Wherein, if the quantity of the antenna port of the DMRS is up to 8, in each short TTI, at least two are chosen It is individual do not map public guide frequency CRS OFDM symbol the step of include：

In each short TTI, the 3rd OFDM symbol, the 4th OFDM symbol, the 6th OFDM symbol and the 7th are chosen Individual OFDM symbol；Or

In each short TTI, the 6th OFDM symbol and the 7th OFDM symbol are chosen.

Wherein, described the step of demodulated reference signal DMRS is mapped in selected OFDM symbol, includes：

If chosen on frequency domain using 1 RB or 12 subcarrier as a unit in selected each OFDM symbol Four adjacent subcarrier maps demodulated reference signal DMRS two-by-two, wherein, selected each subcarrier is in different OFDM Occupy identical frequency domain position in symbol.

Wherein, it is described that four adjacent two-by-two subcarrier maps demodulation references are chosen in selected each OFDM symbol The step of signal DMRS, includes：

The 2nd subcarrier, the 3rd word carrier wave, the 8th subcarrier and the 9th are chosen in selected each OFDM symbol Individual subcarrier maps demodulated reference signal DMRS.

In order to solve the above technical problems, embodiments of the invention additionally provide a kind of base station, including：

First chooses module, in each short transmission time interval TTI, chooses and at least one does not map public guide frequency CRS orthogonal frequency division multiplex OFDM symbol；

Mapping block, for mapping demodulated reference signal DMRS in selected OFDM symbol, and send the DMRS.

Wherein, the first selection module includes：

First chooses submodule, if the time span for the short TTI is the time length corresponding to two OFDM symbols Degree, then in each short TTI, choose an OFDM symbol for not mapping CRS.

Wherein, if the first selection submodule, which is used for each subframe, includes 14 OFDM symbols, in each son The 3rd OFDM symbol and the 13rd OFDM symbol are chosen in frame；Or

The 3rd OFDM symbol and the 14th OFDM symbol are chosen in each subframe；Or

The 4th OFDM symbol and the 13rd OFDM symbol are chosen in each subframe；Or

The 4th OFDM symbol and the 14th OFDM symbol are chosen in each subframe；Or

The 13rd OFDM symbol is chosen in each subframe；Or

The 14th OFDM symbol is chosen in each subframe.

Wherein, the mapping block includes：

First mapping submodule, the quantity for the antenna port of the DMRS are up on 4 and frequency domain with 1 resource block RB or 12 subcarrier is a unit, then the 2nd in selected each OFDM symbol subcarrier, the 3rd subcarrier, DMRS is mapped in 8th subcarrier and the 9th subcarrier；Or

Wherein, the mapping block includes：

Second mapping submodule, the quantity for the antenna port of the DMRS are up on 8 and frequency domain with 1 RB or 12 Individual subcarrier is a unit, then the 2nd in selected each OFDM symbol subcarrier, the 3rd subcarrier, the 4th Mapped in subcarrier, the 5th subcarrier, the 8th subcarrier, the 9th subcarrier, the 10th subcarrier and the 11st subcarrier DMRS；Or

Wherein, the first selection module includes：

Second chooses submodule, if the time span for the short TTI is the time length corresponding to seven OFDM symbols Degree, then according to the maximum of the quantity of DMRS antenna port, choose at least one orthogonal frequency for not mapping public guide frequency CRS It is multiplexed OFDM symbol.

Wherein, the second selection submodule includes：

First chooses unit, if the quantity for DMRS antenna port is up to 4, in each short TTI, and choosing Take at least one OFDM symbol for not mapping public guide frequency CRS.

Wherein, described first unit is chosen in each short TTI, choosing the 3rd OFDM symbol and the 6th OFDM symbol；Or

In each short TTI, the 4th OFDM symbol and the 6th OFDM symbol are chosen；Or

In each short TTI, the 3rd OFDM symbol and the 7th OFDM symbol are chosen；Or

In each short TTI, the 4th OFDM symbol and the 7th OFDM symbol are chosen；Or

In each short TTI, the 6th OFDM symbol is chosen；Or

In each short TTI, the 7th OFDM symbol is chosen.

Wherein, the second selection submodule includes：

Second chooses unit, if the quantity for DMRS antenna port is up to 8, in each short TTI, and choosing Take at least two OFDM symbols for not mapping public guide frequency CRS.

Wherein, it is described second choose unit be used in each short TTI, choose the 3rd OFDM symbol, the 4th OFDM symbol, the 6th OFDM symbol and the 7th OFDM symbol；Or

In each short TTI, the 6th OFDM symbol and the 7th OFDM symbol are chosen.Wherein, the mapping block Including：

3rd mapping submodule, if using 1 RB or 12 subcarrier as a unit on frequency domain, selected Four adjacent two-by-two subcarrier maps demodulated reference signal DMRS are chosen in each OFDM symbol, wherein, selected is each Subcarrier occupies identical frequency domain position in different OFDM symbols.

Wherein, the 3rd mapping submodule is used to choose the 2nd subcarrier, the in selected each OFDM symbol 3 word carrier waves, the 8th subcarrier and the 9th subcarrier maps demodulated reference signal DMRS.

In order to solve the above technical problems, embodiments of the invention additionally provide a kind of terminal, including：

Second chooses module, in each short transmission time interval TTI, chooses and at least one does not map public guide frequency CRS orthogonal frequency division multiplex OFDM symbol；

Acquisition module, the demodulated reference signal DMRS sent for obtaining base station in selected OFDM symbol.

Wherein, the second selection module includes：

3rd chooses submodule, if the time span for the short TTI is the time length corresponding to two OFDM symbols Degree, then in each short TTI, choose an OFDM symbol for not mapping CRS.

Wherein, if the 3rd selection submodule, which is used for each subframe, includes 14 OFDM symbols, in each son The 3rd OFDM symbol and the 13rd OFDM symbol are chosen in frame；Or

The 3rd OFDM symbol and the 14th OFDM symbol are chosen in each subframe；Or

The 4th OFDM symbol and the 13rd OFDM symbol are chosen in each subframe；Or

The 4th OFDM symbol and the 14th OFDM symbol are chosen in each subframe；Or

The 13rd OFDM symbol is chosen in each subframe；Or

The 14th OFDM symbol is chosen in each subframe.

Wherein, the acquisition module includes：

First acquisition submodule, the quantity for the antenna port of the DMRS are up on 4 and frequency domain with 1 resource block RB or 12 subcarrier is a unit, then the 2nd in selected each OFDM symbol subcarrier, the 3rd subcarrier, The DMRS that base station is sent is obtained in 8th subcarrier and the 9th subcarrier；Or

The 2nd subcarrier, the 5th subcarrier, the 8th subcarrier in selected each OFDM symbol and the 12nd The DMRS that base station is sent is obtained in subcarrier；Or

The 1st subcarrier, the 2nd subcarrier, the 9th subcarrier in selected each OFDM symbol and the 10th The DMRS that base station is sent is obtained in subcarrier.

Wherein, the acquisition module includes：

Second acquisition submodule, the quantity for the antenna port of the DMRS are up on 8 and frequency domain with 1 RB or 12 Individual subcarrier is a unit, then the 2nd in selected each OFDM symbol subcarrier, the 3rd subcarrier, the 4th Base is obtained in subcarrier, the 5th subcarrier, the 8th subcarrier, the 9th subcarrier, the 10th subcarrier and the 11st subcarrier Stand the DMRS sent；Or

The 1st subcarrier, the 2nd subcarrier, the 4th subcarrier, the 5th son in selected each OFDM symbol The DMRS that base station is sent is obtained in carrier wave, the 7th subcarrier, the 8th subcarrier, the 11st subcarrier and the 12nd subcarrier； Or

The 1st subcarrier, the 2nd subcarrier, the 3rd subcarrier, the 4th son in selected each OFDM symbol The DMRS that base station is sent is obtained in carrier wave, the 9th subcarrier, the 10th subcarrier, the 11st subcarrier and the 12nd subcarrier.

Wherein, the second selection module includes：

4th chooses submodule, if the time span for the short TTI is the time length corresponding to seven OFDM symbols Degree, then according to the maximum of the quantity of DMRS antenna port, choose at least one orthogonal frequency for not mapping public guide frequency CRS It is multiplexed OFDM symbol.

Wherein, the 4th selection submodule includes：

3rd chooses unit, if the quantity for DMRS antenna port is up to 4, in each short TTI, and choosing Take at least one OFDM symbol for not mapping public guide frequency CRS.

Wherein, the described 3rd unit is chosen in each short TTI, choosing the 3rd OFDM symbol and the 6th OFDM symbol；Or

In each short TTI, the 4th OFDM symbol and the 6th OFDM symbol are chosen；Or

In each short TTI, the 3rd OFDM symbol and the 7th OFDM symbol are chosen；Or

In each short TTI, the 4th OFDM symbol and the 7th OFDM symbol are chosen；Or

In each short TTI, the 6th OFDM symbol is chosen；Or

In each short TTI, the 7th OFDM symbol is chosen.

Wherein, the 4th selection submodule includes：

4th chooses unit, if the quantity for DMRS antenna port is up to 8, in each short TTI, and choosing Take at least two OFDM symbols for not mapping public guide frequency CRS.

Wherein, it is described 4th choose unit be used in each short TTI, choose the 3rd OFDM symbol, the 4th OFDM symbol, the 6th OFDM symbol and the 7th OFDM symbol；Or

In each short TTI, the 6th OFDM symbol and the 7th OFDM symbol are chosen.Wherein, the acquisition module Including：

3rd acquisition submodule, if using 1 RB or 12 subcarrier as a unit on frequency domain, selected Four adjacent two-by-two subcarriers are chosen in each OFDM symbol and obtain the demodulated reference signal DMRS that base station is sent, wherein, institute The each subcarrier chosen occupies identical frequency domain position in different OFDM symbols.

Wherein, the 3rd acquisition submodule is used to choose the 2nd subcarrier, the in selected each OFDM symbol 3 word carrier waves, the 8th subcarrier and the 9th subcarrier obtain the demodulated reference signal DMRS that base station is sent.

The embodiment of the present invention has the advantages that：

The above-mentioned technical proposal of the embodiment of the present invention, in each short transmission time interval TTI, selection is at least one not to reflect Penetrate public guide frequency CRS orthogonal frequency division multiplex OFDM symbol；Demodulated reference signal DMRS is mapped in selected OFDM symbol. The embodiment of the present invention can ensure to include DMRS in each TTI when being demodulated the resource impact of reference signal, and then Substantially increase channel estimating performance.

Brief description of the drawings

Fig. 1 is a workflow diagram of the method for mapping resource of the demodulated reference signal of the embodiment of the present invention；

Fig. 2 is the another workflow diagram of the method for mapping resource of the demodulated reference signal of the embodiment of the present invention；

Fig. 3 is another workflow diagram of the method for mapping resource of the demodulated reference signal of the embodiment of the present invention；

Fig. 4 a are the TTI for the two OFDM symbol length that four layers of transmission is could support up in the embodiment of the present invention the first pilot tone Pattern；

Fig. 4 b are the TTI for the two OFDM symbol length that four layers of transmission is could support up in the embodiment of the present invention the second pilot tone Pattern；

Fig. 4 c are the TTI for the two OFDM symbol length that four layers of transmission is could support up in the embodiment of the present invention the 3rd pilot tone Pattern；

Fig. 5 a are the TTI for the two OFDM symbol length that four layers of transmission is could support up in the embodiment of the present invention the 4th pilot tone Pattern；

Fig. 5 b are the TTI for the two OFDM symbol length that four layers of transmission is could support up in the embodiment of the present invention the 5th pilot tone Pattern；

Fig. 5 c are the TTI for the two OFDM symbol length that four layers of transmission is could support up in the embodiment of the present invention the 6th pilot tone Pattern；

Fig. 6 a are the TTI for the two OFDM symbol length that four layers of transmission is could support up in the embodiment of the present invention the 7th pilot tone Pattern；

Fig. 6 b are the TTI for the two OFDM symbol length that four layers of transmission is could support up in the embodiment of the present invention the 8th pilot tone Pattern；

Fig. 6 c are the TTI for the two OFDM symbol length that four layers of transmission is could support up in the embodiment of the present invention the 9th pilot tone Pattern；

Fig. 7 a are the TTI for the two OFDM symbol length that four layers of transmission is could support up in the embodiment of the present invention the tenth pilot tone Pattern；

Fig. 7 b lead to could support up the 11st of the TTI of two OFDM symbol length of four layers of transmission the in the embodiment of the present invention Frequency pattern；

Fig. 7 c lead to could support up the 12nd of the TTI of two OFDM symbol length of four layers of transmission the in the embodiment of the present invention Frequency pattern；

Fig. 8 a are the TTI for the two OFDM symbol length that eight layers of transmission is could support up in the embodiment of the present invention the first pilot tone Pattern；

Fig. 8 b are the TTI for the two OFDM symbol length that eight layers of transmission is could support up in the embodiment of the present invention the second pilot tone Pattern；

Fig. 8 c are the TTI for the two OFDM symbol length that eight layers of transmission is could support up in the embodiment of the present invention the 3rd pilot tone Pattern；

Fig. 9 a are the TTI for the two OFDM symbol length that eight layers of transmission is could support up in the embodiment of the present invention the 4th pilot tone Pattern；

Fig. 9 b are the TTI for the two OFDM symbol length that eight layers of transmission is could support up in the embodiment of the present invention the 5th pilot tone Pattern；

Fig. 9 c are the TTI for the two OFDM symbol length that eight layers of transmission is could support up in the embodiment of the present invention the 6th pilot tone Pattern；

Figure 10 a lead to could support up the 7th of the TTI of two OFDM symbol length of eight layers of transmission the in the embodiment of the present invention Frequency pattern；

Figure 10 b lead to could support up the 8th of the TTI of two OFDM symbol length of eight layers of transmission the in the embodiment of the present invention Frequency pattern；

Figure 10 c lead to could support up the 9th of the TTI of two OFDM symbol length of eight layers of transmission the in the embodiment of the present invention Frequency pattern；

Figure 11 a lead to could support up the tenth of the TTI of two OFDM symbol length of eight layers of transmission the in the embodiment of the present invention Frequency pattern；

Figure 11 b are the 11st of the TTI for the two OFDM symbol length that eight layers of transmission is could support up in the embodiment of the present invention Pilot tone pattern；

Figure 11 c are the 12nd of the TTI for the two OFDM symbol length that eight layers of transmission is could support up in the embodiment of the present invention Pilot tone pattern；

Figure 12 is the TTI for the seven OFDM symbol length that four layers of transmission is could support up in an embodiment of the present invention pilot patterns Sample；

Figure 13 is the TTI for the seven OFDM symbol length that eight layers of transmission is could support up in an embodiment of the present invention pilot patterns Sample.

Figure 14 is a structured flowchart of the base station of the embodiment of the present invention；

Figure 15 is a structured flowchart of the terminal of the embodiment of the present invention；

Figure 16 is the another structured flowchart of the base station of the embodiment of the present invention；

Figure 17 is the another structured flowchart of the terminal of the embodiment of the present invention.

Embodiment

To make the technical problem to be solved in the present invention, technical scheme and advantage clearer, below in conjunction with specific implementation Example and accompanying drawing are described in detail.

The embodiment provides a kind of method for mapping resource of demodulated reference signal and base station, solve and work as TTI During contraction in length, original pilot tone mapping mode can not make to contain DMRS in each TTI, so as to influence channel estimating performance Problem.

First embodiment：

As shown in figure 1, the method for mapping resource of the demodulated reference signal of the embodiment of the present invention, including：

Step 101：In each short transmission time interval TTI, selection is at least one not to map the orthogonal of public guide frequency CRS Frequency division multiplex OFDM symbol.

In a particular embodiment of the present invention, can be chosen in each short TTI of the resource block comprising 14 OFDM symbols At least one OFDM symbol for not mapping CRS, 12 subcarriers are included in each OFDM symbol.Here short TTI time length Spend and be less than 14 for the time span corresponding to predetermined number OFDM symbol, the predetermined number.Specifically, short TTI time length Degree can be the time span corresponding to time span or seven OFDM symbols corresponding to two OFDM symbols.

Step 102：Demodulated reference signal DMRS is mapped in selected OFDM symbol.

Specifically, demodulated reference signal DMRS is mapped in selected OFDM symbol by using CDM-F, here CDM-F refers to be spread using code division multiplexing (Code Division Multiplexing, CDM) in frequency domain.The present invention is implemented Example does not map public guide frequency CRS OFDM symbol by choosing and and solution is mapped in selected OFDM symbol using CDM-F Reference signal DMRS is adjusted, effectively avoids DMRS from taking identical resource unit and identical OFDM symbol, and energy with public guide frequency Ensure to include DMRS in each TTI.

The method for mapping resource of the demodulated reference signal of the embodiment of the present invention, in each short transmission time interval TTI, choosing Take at least one orthogonal frequency division multiplex OFDM symbol for not mapping public guide frequency CRS；Solution is mapped in selected OFDM symbol Adjust reference signal DMRS.The embodiment of the present invention ensures to include in each TTI when being demodulated the resource impact of reference signal There is DMRS, improve channel estimating performance.

Second embodiment：

As shown in Fig. 2 the method for mapping resource of the demodulated reference signal of the embodiment of the present invention, including：

Step 201：If short TTI time span is the time span corresponding to two OFDM symbols, each described In short TTI, an OFDM symbol for not mapping CRS is chosen.

In a particular embodiment of the present invention, can be chosen in each short TTI of the resource block comprising 14 OFDM symbols One OFDM symbol for not mapping CRS, 12 subcarriers are included in each OFDM symbol.2 OFDM symbols are narrowed down to for TTI Situation, if the control area of resource block includes two OFDM symbols, and mapped in two OFDM symbols in control area There is CRS, then can be optional one in two OFDM symbols in data area first and last TTI, in data area An OFDM symbol (the data area first for not mapping CRS is chosen in TTI between first TTI and last TTI There is one to map CRS in TTI two OFDM symbols between TTI and last TTI).

Specifically, as shown in Fig. 4 a, 4b, 4c, 8a, 8b and 8c, if each subframe includes 14 OFDM symbols, each The 3rd OFDM symbol and the 13rd OFDM symbol are chosen in the subframe；Or

As shown in Fig. 6 a, 6b, 6c, 10a, 10b and 10c, the 3rd OFDM symbol and the are chosen in each subframe 14 OFDM symbols；Or

As shown in Fig. 5 a, 5b, 5c, 9a, 9b and 9c, the 4th OFDM symbol and the 13rd is chosen in each subframe Individual OFDM symbol；Or

As shown in Fig. 7 a, 7b, 7c, 11a, 11b and 11c, the 4th OFDM symbol and the are chosen in each subframe 14 OFDM symbols；Or

The 13rd OFDM symbol is chosen in each subframe (herein for the 3rd OFDM symbol of each subframe The situation of control area is in the 4th OFDM symbol, not shown in figure)；Or

The 14th OFDM symbol is chosen in each subframe (herein for the 3rd OFDM symbol of each subframe The situation of control area is in the 4th OFDM symbol, not shown in figure).

Step 202：Demodulated reference signal DMRS is mapped in selected OFDM symbol.

The embodiment of the present invention is up to 4 for the short TTI of 2 OFDM symbol length in the quantity of DMRS antenna port When (transmission that the number of plies is 4 is supported based on highest), be proposed for antenna port R7-R10 3 kinds of pilot patterns sample prescription cases (a), (b) (c).For each TTI, the reference signal on one row of frequency domain, 4 RE does CDM multiplexing process, carries out frequency domain spread spectrum, pilot tone end Orthogonality between mouthful is ensured by frequency domain expansion.Wherein, (a) scheme is inserted as shown in Fig. 4 a, 5a, 6a, 7a on each TTI One row DMRS, take frequency domain on k=1,2,7,8 resource element RE positions, and avoid with CRS symbol conflicts, (b) scheme is such as Shown in Fig. 4 b, 5b, 6b, 7b, on the basis of (a) scheme, DMRS is allowed to be evenly distributed on as far as possible in Physical Resource Block PRB, (c) as shown in Fig. 4 c, 5c, 6c, 7c, DMRS is allowed to be distributed in PRB edges as much as possible on the basis of (a) scheme.

Specifically, as shown in Fig. 4 a, 5a, 6a, 7a, the quantity of DMRS antenna port is up to 4, if with 1 on frequency domain Resource block RB or 12 subcarriers are a unit, then the 2nd in selected each OFDM symbol subcarrier, the 3rd DMRS is mapped in subcarrier, the 8th subcarrier and the 9th subcarrier；Or

As shown in Fig. 4 b, 5b, 6b, 7b, the 2nd subcarrier, the 5th son in selected each OFDM symbol carry DMRS is mapped in ripple, the 8th subcarrier and the 12nd subcarrier；Or

As shown in Fig. 4 c, 5c, 6c, 7c, the 1st subcarrier, the 2nd son in selected each OFDM symbol carry DMRS is mapped in ripple, the 9th subcarrier and the 10th subcarrier.

For the short TTI of 2 OFDM symbol length in the embodiment of the present invention, and the quantity of DMRS antenna port is up to When 8 (transmission for being 8 based on the highest support number of plies), 3 kinds of pilot patterns sample prescription cases are proposed.For each TTI, antenna port R7, R8, R11, R13 are one group of CDM group, and antenna port R9, R10, R12, R14 are another set CDM groups, and are led between different CDM groups Frequency division is crossed to distinguish.

Specifically, as shown in Fig. 8 a, 9a, 10a, 11a, the quantity of DMRS antenna port is up to 8, if with 1 on frequency domain Individual RB or 12 subcarrier is a unit, then the 2nd in selected each OFDM symbol subcarrier, the 3rd son Carrier wave, the 4th subcarrier, the 5th subcarrier, the 8th subcarrier, the 9th subcarrier, the 10th subcarrier and the 11st son carry DMRS is mapped in ripple；Or

As shown in Fig. 8 b, 9b, 10b, 11b, the 1st subcarrier, the 2nd son in selected each OFDM symbol carry Ripple, the 4th subcarrier, the 5th subcarrier, the 7th subcarrier, the 8th subcarrier, the 11st subcarrier and the 12nd subcarrier Middle mapping DMRS；Or

As shown in Fig. 8 c, 9c, 10c, 11c, the 1st subcarrier, the 2nd son in selected each OFDM symbol carry Ripple, the 3rd subcarrier, the 4th subcarrier, the 9th subcarrier, the 10th subcarrier, the 11st subcarrier and the 12nd son carry DMRS is mapped in ripple.

The method for mapping resource of the demodulated reference signal of the embodiment of the present invention, for the short TTI of 2 OFDM symbol length, In each short transmission time interval TTI, an orthogonal frequency division multiplex OFDM symbol for not mapping public guide frequency CRS is chosen； Demodulated reference signal DMRS is mapped in selected OFDM symbol.The embodiment of the present invention is reflected in the resource for being demodulated reference signal When penetrating, ensure to include DMRS in each TTI, improve channel estimating performance.

3rd embodiment：

As shown in figure 3, the method for mapping resource of the demodulated reference signal of the embodiment of the present invention, including：

Step 301：If the time span of the short TTI is the time span corresponding to seven OFDM symbols, basis The maximum of the quantity of DMRS antenna port, choose at least one orthogonal frequency division multiplex OFDM for not mapping public guide frequency CRS Symbol.

In a particular embodiment of the present invention, can be chosen in each short TTI of the resource block comprising 14 OFDM symbols At least one OFDM symbol for not mapping CRS, 12 subcarriers are included in each OFDM symbol.For 7 in the embodiment of the present invention The short TTI of individual OFDM symbol length, equally CDM-F method can be used to carry out pilot resources mapping., can for each TTI The row of insertion two or four row pilot tones, belong to identical CDM groups.On the premise of not conflicting with CRS symbols, pilot tone is on frequency domain Position distribution is on 4 RE, wherein respective two RE are adjacent to be divided into two groups, two groups of RE are spaced a distance；Two in time domain Row pilot tone is also spaced a distance.Figure 12 and Figure 13 is that highest supports 4 layers of transmission and highest to support 8 layers of two transmitted respectively Pilot tone pattern.When Figure 12 is shown based on highest 4 layers of transmission of support, antenna port R7-R10 pilot tone pattern, led on frequency domain Frequency engaged position is k=1,2,7,8, engaged position is l=2 in time domain, and 5；Figure 13 is shown supports 8 layers of transmission based on highest When, antenna port R7-R14 pilot tone pattern, pilot tone engaged position is k=1 on frequency domain, 2,7,8, engaged position is in time domain L=2,3,5,6.

In the case of TTI narrows down to 7 OFDM symbols, it can be selected according to the maximum of the quantity of DMRS antenna port Take at least one or at least two OFDM symbols.

Specifically, if the quantity of DMRS antenna port is up to 4, in each short TTI, selection is at least one not to reflect Penetrate public guide frequency CRS OFDM symbol.Further, as shown in figure 12, in each short TTI, choose the 3rd OFDM symbol and 6th OFDM symbol；Or

In each short TTI, the 4th OFDM symbol and the 6th OFDM symbol are chosen；Or

In each short TTI, the 3rd OFDM symbol and the 7th OFDM symbol are chosen；Or

In each short TTI, the 4th OFDM symbol and the 7th OFDM symbol are chosen；Or

In each short TTI, the 6th OFDM symbol (the 3rd OFDM symbol herein for each subframe and the are chosen Four OFDM symbols are in the situation of control area, not shown in figure)；Or

In each short TTI, the 7th OFDM symbol (the 3rd OFDM symbol herein for each subframe and the are chosen Four OFDM symbols are in the situation of control area, not shown in figure).

If the quantity of DMRS antenna port is up to 8, in each short TTI, selection at least two does not map public Pilot tone CRS OFDM symbol.Further, as shown in figure 13, in each short TTI, choose the 3rd OFDM symbol, the 4th OFDM symbol, the 6th OFDM symbol and the 7th OFDM symbol；Or

In each short TTI, the 6th OFDM symbol and the 7th OFDM symbol are chosen (herein for the 3rd of each subframe the Individual OFDM symbol and the 4th OFDM symbol are in the situation of control area, not shown in figure).

Step 302：Demodulated reference signal DMRS is mapped in selected OFDM symbol.

Specifically, as shown in Figures 12 and 13, if using 1 RB or 12 subcarrier as a unit on frequency domain, selected Four adjacent two-by-two subcarrier maps demodulated reference signal DMRS are chosen in each OFDM symbol taken, wherein, it is selected Each subcarrier occupies identical frequency domain position in different OFDM symbols.

Further, as shown in Figures 12 and 13, in selected each OFDM symbol choose the 2nd subcarrier, the 3rd Word carrier wave, the 8th word subcarrier and the 9th subcarrier maps demodulated reference signal DMRS.

The method for mapping resource of the demodulated reference signal of the embodiment of the present invention, for the short TTI of 7 OFDM symbol length, In each short transmission time interval TTI, multiple orthogonal frequency division multiplex OFDM symbols for not mapping public guide frequency CRS are chosen； Demodulated reference signal DMRS is mapped in selected OFDM symbol.The embodiment of the present invention is reflected in the resource for being demodulated reference signal When penetrating, ensure to include DMRS in each TTI, improve channel estimating performance.

Fourth embodiment：

As shown in figure 14, embodiments of the invention additionally provide a kind of base station, including：

First chooses module 141, in each short transmission time interval TTI, choose it is at least one do not map it is public Pilot tone CRS orthogonal frequency division multiplex OFDM symbol；

Mapping block 142, for mapping demodulated reference signal DMRS in selected OFDM symbol, and described in transmission DMRS。

The base station of the embodiment of the present invention, the first selection module 141 include：

First chooses submodule 1411, if the time span for the short TTI corresponding to two OFDM symbols when Between length, then in each short TTI, choose an OFDM symbol for not mapping CRS.

The base station of the embodiment of the present invention, if the first selection submodule 1411 is used for each subframe and includes 14 OFDM symbols Number, then the 3rd OFDM symbol and the 13rd OFDM symbol are chosen in each subframe；Or

The 3rd OFDM symbol and the 14th OFDM symbol are chosen in each subframe；Or

The 4th OFDM symbol and the 13rd OFDM symbol are chosen in each subframe；Or

The 4th OFDM symbol and the 14th OFDM symbol are chosen in each subframe；Or

The 13rd OFDM symbol is chosen in each subframe；Or

The 14th OFDM symbol is chosen in each subframe.

The base station of the embodiment of the present invention, the mapping block 142 include：

First mapping submodule 1421, the quantity for the antenna port of the DMRS are up on 4 and frequency domain with 1 money Source block RB or 12 subcarriers are a unit, then the 2nd in selected each OFDM symbol subcarrier, the 3rd son DMRS is mapped in carrier wave, the 8th subcarrier and the 9th subcarrier；Or

Second mapping submodule 1422, the quantity for the antenna port of the DMRS are up on 8 and frequency domain with 1 RB Or 12 subcarriers are a unit, then the 2nd in selected each OFDM symbol subcarrier, the 3rd subcarrier, Reflected in 4 subcarriers, the 5th subcarrier, the 8th subcarrier, the 9th subcarrier, the 10th subcarrier and the 11st subcarrier Penetrate DMRS；Or

Second chooses submodule 1412, if the time span for the short TTI corresponding to seven OFDM symbols when Between length, then according to the maximum of the quantity of DMRS antenna port, choose and at least one do not map the orthogonal of public guide frequency CRS Frequency division multiplex OFDM symbol.

The base station of the embodiment of the present invention, the second selection submodule 1412 include：

First chooses unit 14121, if the quantity for DMRS antenna port is up to 4, in each short TTI, Choose at least one OFDM symbol for not mapping public guide frequency CRS.

The base station of the embodiment of the present invention, described first, which chooses unit, is used in each short TTI, chooses the 3rd OFDM symbol Number and the 6th OFDM symbol；Or

In each short TTI, the 4th OFDM symbol and the 6th OFDM symbol are chosen；Or

In each short TTI, the 3rd OFDM symbol and the 7th OFDM symbol are chosen；Or

In each short TTI, the 4th OFDM symbol and the 7th OFDM symbol are chosen；Or

In each short TTI, the 6th OFDM symbol is chosen；Or

In each short TTI, the 7th OFDM symbol is chosen.

Second chooses unit 14122, if the quantity for DMRS antenna port is up to 8, in each short TTI, Choose at least two OFDM symbols for not mapping public guide frequency CRS.

The base station of the embodiment of the present invention, described second, which chooses unit, is used in each short TTI, chooses the 3rd OFDM symbol Number, the 4th OFDM symbol, the 6th OFDM symbol and the 7th OFDM symbol；Or

In each short TTI, the 6th OFDM symbol and the 7th OFDM symbol are chosen.

3rd mapping submodule 1423, if using 1 RB or 12 subcarrier as a unit on frequency domain, selected Four adjacent two-by-two subcarrier maps demodulated reference signal DMRS are chosen in each OFDM symbol taken, wherein, it is selected Each subcarrier occupies identical frequency domain position in different OFDM symbols.

The base station of the embodiment of the present invention, the 3rd mapping submodule 1423 are used in selected each OFDM symbol Choose the 2nd subcarrier, the 3rd word carrier wave, the 8th subcarrier and the 9th subcarrier maps demodulated reference signal DMRS.

It should be noted that the base station is base station corresponding with above method embodiment, own in above method embodiment Implementation can also reach identical technique effect suitable for the embodiment of the base station.

The base station of the embodiment of the present invention, in each short transmission time interval TTI, selection is at least one not to map public lead Frequency CRS orthogonal frequency division multiplex OFDM symbol；Demodulated reference signal DMRS is mapped in selected OFDM symbol.It is of the invention real Example is applied when being demodulated the resource impact of reference signal, can ensure to include DMRS in each TTI, and then greatly improve Channel estimating performance.

5th embodiment：

Embodiments of the invention additionally provide a kind of terminal, as shown in figure 15, including：

Second chooses module 151, in each short transmission time interval TTI, choose it is at least one do not map it is public Pilot tone CRS orthogonal frequency division multiplex OFDM symbol；

Acquisition module 152, the demodulated reference signal DMRS sent for obtaining base station in selected OFDM symbol.

The terminal of the embodiment of the present invention, the second selection module 151 include：

3rd chooses submodule 1511, if the time span for the short TTI corresponding to two OFDM symbols when Between length, then in each short TTI, choose an OFDM symbol for not mapping CRS.

The terminal of the embodiment of the present invention, if the 3rd selection submodule 1511 is used for each subframe and includes 14 OFDM symbols Number, then the 3rd OFDM symbol and the 13rd OFDM symbol are chosen in each subframe；Or

The 3rd OFDM symbol and the 14th OFDM symbol are chosen in each subframe；Or

The 4th OFDM symbol and the 13rd OFDM symbol are chosen in each subframe；Or

The 4th OFDM symbol and the 14th OFDM symbol are chosen in each subframe；Or

The 13rd OFDM symbol is chosen in each subframe；Or

The 14th OFDM symbol is chosen in each subframe.

The terminal of the embodiment of the present invention, the acquisition module 152 include：

First acquisition submodule 1521, the quantity for the antenna port of the DMRS are up on 4 and frequency domain with 1 money Source block RB or 12 subcarriers are a unit, then the 2nd in selected each OFDM symbol subcarrier, the 3rd son The DMRS that base station is sent is obtained in carrier wave, the 8th subcarrier and the 9th subcarrier；Or

Second acquisition submodule 1522, the quantity for the antenna port of the DMRS are up on 8 and frequency domain with 1 RB Or 12 subcarriers are a unit, then the 2nd in selected each OFDM symbol subcarrier, the 3rd subcarrier, Obtained in 4 subcarriers, the 5th subcarrier, the 8th subcarrier, the 9th subcarrier, the 10th subcarrier and the 11st subcarrier The DMRS for taking base station to send；Or

4th chooses submodule 1512, if the time span for the short TTI corresponding to seven OFDM symbols when Between length, then according to the maximum of the quantity of DMRS antenna port, choose and at least one do not map the orthogonal of public guide frequency CRS Frequency division multiplex OFDM symbol.

The terminal of the embodiment of the present invention, the 4th selection submodule 1512 include：

3rd chooses unit 15121, if the quantity for DMRS antenna port is up to 4, in each short TTI, Choose at least one OFDM symbol for not mapping public guide frequency CRS.

The terminal of the embodiment of the present invention, the described 3rd, which chooses unit 15121, is used in each short TTI, chooses the 3rd OFDM symbol and the 6th OFDM symbol；Or

In each short TTI, the 4th OFDM symbol and the 6th OFDM symbol are chosen；Or

In each short TTI, the 3rd OFDM symbol and the 7th OFDM symbol are chosen；Or

In each short TTI, the 4th OFDM symbol and the 7th OFDM symbol are chosen；Or

In each short TTI, the 6th OFDM symbol is chosen；Or

In each short TTI, the 7th OFDM symbol is chosen.

4th chooses unit 15122, if the quantity for DMRS antenna port is up to 8, in each short TTI, Choose at least two OFDM symbols for not mapping public guide frequency CRS.

The base station of the embodiment of the present invention, the described 4th, which chooses unit, is used in each short TTI, chooses the 3rd OFDM symbol Number, the 4th OFDM symbol, the 6th OFDM symbol and the 7th OFDM symbol；Or

In each short TTI, the 6th OFDM symbol and the 7th OFDM symbol are chosen.

3rd acquisition submodule 1523, if using 1 RB or 12 subcarrier as a unit on frequency domain, selected Four adjacent two-by-two subcarriers are chosen in each OFDM symbol taken and obtain the demodulated reference signal DMRS that base station is sent, its In, selected each subcarrier occupies identical frequency domain position in different OFDM symbols.

The terminal of the embodiment of the present invention, the 3rd acquisition submodule 1523 are used in selected each OFDM symbol Choose the 2nd subcarrier, the 3rd word carrier wave, the 8th subcarrier and the 9th subcarrier and obtain the demodulation reference letter that base station is sent Number DMRS.

It should be noted that the terminal is terminal corresponding with above method embodiment, own in above method embodiment Implementation can also reach identical technique effect suitable for the embodiment of the terminal.

The terminal of the embodiment of the present invention, in each short transmission time interval TTI, selection is at least one not to map public lead Frequency CRS orthogonal frequency division multiplex OFDM symbol；The demodulated reference signal that base station is sent is obtained in selected OFDM symbol DMRS.The embodiment of the present invention can ensure to include in each TTI when being demodulated the resource impact of reference signal DMRS, and then substantially increase channel estimating performance.

Sixth embodiment：

In order to preferably realize above-mentioned purpose, as shown in figure 16, the fifth embodiment of the present invention additionally provides a kind of base station, The base station includes：Processor 1600；The memory 1620 being connected by EBI with the processor 1600, and pass through The transceiver 1610 that EBI is connected with processor 1600；The memory 1620 is performing for storing the processor Used program and data during operation；Data message or pilot tone are sent by the transceiver 1610, also pass through the receipts Hair machine 1610 receives ascending control channel；When processor 1600 call and perform the program that is stored in the memory 1620 and During data, following functional module is realized：

Processor 1600 is used to read the program in memory 1620, performs following process：Between each short transmission time Every in TTI, at least one orthogonal frequency division multiplex OFDM symbol for not mapping public guide frequency CRS is chosen, is accorded with selected OFDM Demodulated reference signal DMRS is mapped in number, and the DMRS is sent by transceiver 1610.

Transceiver 1610, for data to be received and sent under the control of processor 1600.

Wherein, in figure 16, bus architecture can include the bus and bridge of any number of interconnection, specifically by processor The various circuits for the memory that 1600 one or more processors represented and memory 1620 represent link together.Total coil holder Structure can also link together various other circuits of such as ancillary equipment, voltage-stablizer and management circuit or the like, this A little is all it is known in the art, therefore, no longer it is described further herein.EBI provides interface.Transceiver 1610 can be multiple element, i.e., including transmitter and transceiver, there is provided for leading to over a transmission medium with various other devices The unit of letter.Processor 1600 is responsible for bus architecture and common processing, and memory 1620 can store processor 1600 The used data when performing operation.

The base station of the embodiment of the present invention, processor 1600 are used in each short transmission time interval TTI, choose at least one The individual orthogonal frequency division multiplex OFDM symbol for not mapping public guide frequency CRS；Demodulation reference letter is mapped in selected OFDM symbol Number DMRS.The embodiment of the present invention can ensure to include in each TTI when being demodulated the resource impact of reference signal DMRS, and then substantially increase channel estimating performance.

7th embodiment：

In order to preferably realize above-mentioned purpose, as shown in figure 17, the seventh embodiment of the present invention also provides a kind of terminal, should Terminal includes：Processor 1700；The memory 1720 being connected by EBI with the processor 1700, and by total The transceiver 1710 that line interface is connected with processor 1700；The memory is used to store the processor when performing operation Used program and data；Down control channel is received by the transceiver 1710；When processor 1700 calls and performs When the program and data that are stored in the memory 1720, following functional module is realized：

Processor 1700 is used to read the program in memory 1720, performs following process：Between each short transmission time Every in TTI, at least one orthogonal frequency division multiplex OFDM symbol for not mapping public guide frequency CRS is chosen, and pass through transceiver 1710 The demodulated reference signal DMRS that base station is sent is obtained in selected OFDM symbol.

Transceiver 1710, for data to be received and sent under the control of processor 1700.

Wherein, in fig. 17, bus architecture can include the bus and bridge of any number of interconnection, specifically by processor The various circuits for the memory that 1700 one or more processors represented and memory 1520 represent link together.Total coil holder Structure can also link together various other circuits of such as ancillary equipment, voltage-stablizer and management circuit or the like, this A little is all it is known in the art, therefore, no longer it is described further herein.EBI provides interface.Transceiver 1710 can be multiple element, i.e., including transmitter and receiver, there is provided for leading to over a transmission medium with various other devices The unit of letter.For different user equipmenies, user interface 1730, which can also be, the interface for needing equipment external is inscribed, even The equipment connect includes but is not limited to keypad, display, loudspeaker, microphone, control stick etc..

Processor 1700 is responsible for bus architecture and common processing, and memory 1720 can store processor 1700 and exist Used data when performing operation.

The terminal of the embodiment of the present invention, processor 1700 are used in each short transmission time interval TTI, choose at least one The individual orthogonal frequency division multiplex OFDM symbol for not mapping public guide frequency CRS；Obtain what base station was sent in selected OFDM symbol Demodulated reference signal DMRS.The embodiment of the present invention can ensure in each TTI when being demodulated the resource impact of reference signal Include DMRS, and then substantially increase channel estimating performance.

The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention God any modification, equivalent substitution and improvements made etc., should be included in the scope of the protection with principle.

Claims

A kind of 1. method for mapping resource of demodulated reference signal, it is characterised in that including：

In each short transmission time interval TTI, at least one orthogonal frequency division multiplex OFDM for not mapping public guide frequency CRS is chosen Symbol；

Demodulated reference signal DMRS is mapped in selected OFDM symbol.
2. the method for mapping resource of demodulated reference signal according to claim 1, it is characterised in that described in each short pass In defeated time interval TTI, choose it is at least one do not map public guide frequency CRS orthogonal frequency division multiplex OFDM symbol the step of wrap Include：

If the time span of the short TTI is the time span corresponding to two OFDM symbols, in each short TTI, Choose an OFDM symbol for not mapping CRS.
3. the method for mapping resource of demodulated reference signal according to claim 2, it is characterised in that if described short TTI time span is the time span corresponding to two OFDM symbols, then in each short TTI, chooses one and do not reflect The step of OFDM symbol for penetrating CRS, includes：

If each subframe includes 14 OFDM symbols, the 3rd OFDM symbol and the 13rd are chosen in each subframe OFDM symbol；Or

The 3rd OFDM symbol and the 14th OFDM symbol are chosen in each subframe；Or

The 4th OFDM symbol and the 13rd OFDM symbol are chosen in each subframe；Or

The 4th OFDM symbol and the 14th OFDM symbol are chosen in each subframe；Or

The 13rd OFDM symbol is chosen in each subframe；Or

The 14th OFDM symbol is chosen in each subframe.
4. the method for mapping resource of demodulated reference signal according to claim 2, it is characterised in that the antenna of the DMRS The quantity of port is up to 4；

Described the step of demodulated reference signal DMRS is mapped in selected OFDM symbol, includes：

If using 1 resource block RB or 12 subcarriers as a unit on frequency domain, in selected each OFDM symbol DMRS is mapped in 2nd subcarrier, the 3rd subcarrier, the 8th subcarrier and the 9th subcarrier；Or

The 2nd subcarrier, the 5th subcarrier, the 8th subcarrier and the 12nd son in selected each OFDM symbol carry DMRS is mapped in ripple；Or

The 1st subcarrier, the 2nd subcarrier, the 9th subcarrier and the 10th son in selected each OFDM symbol carry DMRS is mapped in ripple.
5. the method for mapping resource of demodulated reference signal according to claim 2, it is characterised in that the antenna of the DMRS The quantity of port is up to 8；

Described the step of demodulated reference signal DMRS is mapped in selected OFDM symbol, includes：

If using 1 RB or 12 subcarrier as a unit on frequency domain, the 2nd son in selected each OFDM symbol Carrier wave, the 3rd subcarrier, the 4th subcarrier, the 5th subcarrier, the 8th subcarrier, the 9th subcarrier, the 10th subcarrier And map DMRS in the 11st subcarrier；Or

The 1st subcarrier, the 2nd subcarrier, the 4th subcarrier, the 5th son in selected each OFDM symbol carry DMRS is mapped in ripple, the 7th subcarrier, the 8th subcarrier, the 11st subcarrier and the 12nd subcarrier；Or

The 1st subcarrier, the 2nd subcarrier, the 3rd subcarrier, the 4th son in selected each OFDM symbol carry DMRS is mapped in ripple, the 9th subcarrier, the 10th subcarrier, the 11st subcarrier and the 12nd subcarrier.
6. the method for mapping resource of demodulated reference signal according to claim 1, it is characterised in that described in each short pass In defeated time interval TTI, choose it is at least one do not map public guide frequency CRS orthogonal frequency division multiplex OFDM symbol the step of wrap Include：

If the time span of the short TTI is the time span corresponding to seven OFDM symbols, according to DMRS antenna port Quantity maximum, choose at least one orthogonal frequency division multiplex OFDM symbol for not mapping public guide frequency CRS.
7. the method for mapping resource of demodulated reference signal according to claim 6, it is characterised in that if described short TTI time span is the time span corresponding to seven OFDM symbols, then according to the maximum of the quantity of DMRS antenna port Value, choose it is at least one do not map public guide frequency CRS orthogonal frequency division multiplex OFDM symbol the step of include：

If the quantity of DMRS antenna port is up to 4, in each short TTI, choose it is at least one do not map it is public Pilot tone CRS OFDM symbol.
8. the method for mapping resource of demodulated reference signal according to claim 7, it is characterised in that if the day of the DMRS The quantity of line end mouth is up to 4, then in each short TTI, chooses at least one OFDM symbols for not mapping public guide frequency CRS Number the step of include：

In each short TTI, the 3rd OFDM symbol and the 6th OFDM symbol are chosen；Or

In each short TTI, the 4th OFDM symbol and the 6th OFDM symbol are chosen；Or

In each short TTI, the 3rd OFDM symbol and the 7th OFDM symbol are chosen；Or

In each short TTI, the 4th OFDM symbol and the 7th OFDM symbol are chosen；Or

In each short TTI, the 6th OFDM symbol is chosen；Or

In each short TTI, the 7th OFDM symbol is chosen.
9. the method for mapping resource of demodulated reference signal according to claim 6, it is characterised in that if described short TTI time span is the time span corresponding to seven OFDM symbols, then according to the maximum of the quantity of DMRS antenna port Value, choose it is at least one do not map public guide frequency CRS orthogonal frequency division multiplex OFDM symbol the step of include：

If the quantity of DMRS antenna port is up to 8, in each short TTI, selection at least two does not map public Pilot tone CRS OFDM symbol.
10. the method for mapping resource of demodulated reference signal according to claim 9, it is characterised in that if the DMRS The quantity of antenna port is up to 8, then in each short TTI, chooses at least two OFDM for not mapping public guide frequency CRS The step of symbol, includes：

In each short TTI, the 3rd OFDM symbol of selection, the 4th OFDM symbol, the 6th OFDM symbol and the 7th OFDM symbol；Or

In each short TTI, the 6th OFDM symbol and the 7th OFDM symbol are chosen.
11. the method for mapping resource of the demodulated reference signal according to claim 7 or 9, it is characterised in that described selected The step of demodulated reference signal DMRS is mapped in the OFDM symbol taken includes：

If chosen two-by-two in selected each OFDM symbol using 1 RB or 12 subcarrier as a unit on frequency domain Four adjacent subcarrier maps demodulated reference signal DMRS, wherein, selected each subcarrier is in different OFDM symbols In occupy identical frequency domain position.
12. the method for mapping resource of demodulated reference signal according to claim 11, it is characterised in that described selected Each OFDM symbol in the step of choosing four adjacent two-by-two subcarrier maps demodulated reference signal DMRS include：

The 2nd subcarrier, the 3rd word carrier wave, the 8th subcarrier and the 9th son are chosen in selected each OFDM symbol Carrier wave mapping demodulated reference signal DMRS.
A kind of 13. base station, it is characterised in that including：

First chooses module, in each short transmission time interval TTI, chooses and at least one does not map public guide frequency CRS Orthogonal frequency division multiplex OFDM symbol；

Mapping block, for mapping demodulated reference signal DMRS in selected OFDM symbol, and send the DMRS.
14. base station according to claim 13, it is characterised in that the first selection module includes：

First chooses submodule, if the time span for the short TTI is the time span corresponding to two OFDM symbols, In each short TTI, an OFDM symbol for not mapping CRS is chosen.
15. base station according to claim 14, it is characterised in that if described first chooses submodule for each subframe bag Containing 14 OFDM symbols, then the 3rd OFDM symbol and the 13rd OFDM symbol are chosen in each subframe；Or

The 3rd OFDM symbol and the 14th OFDM symbol are chosen in each subframe；Or

The 4th OFDM symbol and the 13rd OFDM symbol are chosen in each subframe；Or

The 4th OFDM symbol and the 14th OFDM symbol are chosen in each subframe；Or

The 13rd OFDM symbol is chosen in each subframe；Or

The 14th OFDM symbol is chosen in each subframe.
16. base station according to claim 14, it is characterised in that the mapping block includes：

First mapping submodule, the quantity for the antenna port of the DMRS be up on 4 and frequency domain with 1 resource block RB or 12 subcarriers are a unit, then the 2nd in selected each OFDM symbol subcarrier, the 3rd subcarrier, the 8th DMRS is mapped in individual subcarrier and the 9th subcarrier；Or

The 2nd subcarrier, the 5th subcarrier, the 8th subcarrier and the 12nd son in selected each OFDM symbol carry DMRS is mapped in ripple；Or

The 1st subcarrier, the 2nd subcarrier, the 9th subcarrier and the 10th son in selected each OFDM symbol carry DMRS is mapped in ripple.
17. base station according to claim 14, it is characterised in that the mapping block includes：

Second mapping submodule, the quantity for the antenna port of the DMRS are up on 8 and frequency domain with 1 RB or 12 son Carrier wave is a unit, then the 2nd in selected each OFDM symbol subcarrier, the 3rd subcarrier, the 4th son carry DMRS is mapped in ripple, the 5th subcarrier, the 8th subcarrier, the 9th subcarrier, the 10th subcarrier and the 11st subcarrier； Or

The 1st subcarrier, the 2nd subcarrier, the 4th subcarrier, the 5th son in selected each OFDM symbol carry DMRS is mapped in ripple, the 7th subcarrier, the 8th subcarrier, the 11st subcarrier and the 12nd subcarrier；Or

The 1st subcarrier, the 2nd subcarrier, the 3rd subcarrier, the 4th son in selected each OFDM symbol carry DMRS is mapped in ripple, the 9th subcarrier, the 10th subcarrier, the 11st subcarrier and the 12nd subcarrier.
18. base station according to claim 13, it is characterised in that the first selection module includes：

Second chooses submodule, if the time span for the short TTI is the time span corresponding to seven OFDM symbols, According to the maximum of the quantity of DMRS antenna port, at least one OFDM for not mapping public guide frequency CRS is chosen OFDM symbol.
19. base station according to claim 18, it is characterised in that the second selection submodule includes：

First chooses unit, if the quantity for DMRS antenna port is up to 4, in each short TTI, chooses extremely A few OFDM symbol for not mapping public guide frequency CRS.
20. base station according to claim 19, it is characterised in that described first, which chooses unit, is used for each described short In TTI, the 3rd OFDM symbol and the 6th OFDM symbol are chosen；Or

In each short TTI, the 4th OFDM symbol and the 6th OFDM symbol are chosen；Or

In each short TTI, the 3rd OFDM symbol and the 7th OFDM symbol are chosen；Or

In each short TTI, the 4th OFDM symbol and the 7th OFDM symbol are chosen；Or

In each short TTI, the 6th OFDM symbol is chosen；Or

In each short TTI, the 7th OFDM symbol is chosen.
21. base station according to claim 18, it is characterised in that the second selection submodule includes：

Second chooses unit, if the quantity for DMRS antenna port is up to 8, in each short TTI, chooses extremely Few two OFDM symbols for not mapping public guide frequency CRS.
22. base station according to claim 21, described second, which chooses unit, is used in each short TTI, chooses the 3rd Individual OFDM symbol, the 4th OFDM symbol, the 6th OFDM symbol and the 7th OFDM symbol；Or

In each short TTI, the 6th OFDM symbol and the 7th OFDM symbol are chosen.
23. the base station according to claim 19 or 21, it is characterised in that the mapping block includes：

3rd mapping submodule, if using 1 RB or 12 subcarrier as a unit on frequency domain, selected each Four adjacent two-by-two subcarrier maps demodulated reference signal DMRS are chosen in OFDM symbol, wherein, selected every height carries Ripple occupies identical frequency domain position in different OFDM symbols.
24. base station according to claim 23, it is characterised in that the 3rd mapping submodule is used for selected every The 2nd subcarrier, the 3rd word carrier wave, the 8th subcarrier and the 9th subcarrier maps demodulation reference are chosen in individual OFDM symbol Signal DMRS.
A kind of 25. terminal, it is characterised in that including：

Second chooses module, in each short transmission time interval TTI, chooses and at least one does not map public guide frequency CRS Orthogonal frequency division multiplex OFDM symbol；

Acquisition module, the demodulated reference signal DMRS sent for obtaining base station in selected OFDM symbol.
26. terminal according to claim 25, it is characterised in that the second selection module includes：

3rd chooses submodule, if the time span for the short TTI is the time span corresponding to two OFDM symbols, In each short TTI, an OFDM symbol for not mapping CRS is chosen.
27. terminal according to claim 26, it is characterised in that if the described 3rd chooses submodule for each subframe bag Containing 14 OFDM symbols, then the 3rd OFDM symbol and the 13rd OFDM symbol are chosen in each subframe；Or

The 3rd OFDM symbol and the 14th OFDM symbol are chosen in each subframe；Or

The 4th OFDM symbol and the 13rd OFDM symbol are chosen in each subframe；Or

The 4th OFDM symbol and the 14th OFDM symbol are chosen in each subframe；Or

The 13rd OFDM symbol is chosen in each subframe；Or

The 14th OFDM symbol is chosen in each subframe.
28. terminal according to claim 26, it is characterised in that the acquisition module includes：

First acquisition submodule, the quantity for the antenna port of the DMRS be up on 4 and frequency domain with 1 resource block RB or 12 subcarriers are a unit, then the 2nd in selected each OFDM symbol subcarrier, the 3rd subcarrier, the 8th The DMRS that base station is sent is obtained in individual subcarrier and the 9th subcarrier；Or

The 2nd subcarrier, the 5th subcarrier, the 8th subcarrier and the 12nd son in selected each OFDM symbol carry The DMRS that base station is sent is obtained in ripple；Or

The 1st subcarrier, the 2nd subcarrier, the 9th subcarrier and the 10th son in selected each OFDM symbol carry The DMRS that base station is sent is obtained in ripple.
29. terminal according to claim 26, it is characterised in that the acquisition module includes：

Second acquisition submodule, the quantity for the antenna port of the DMRS are up on 8 and frequency domain with 1 RB or 12 son Carrier wave is a unit, then the 2nd in selected each OFDM symbol subcarrier, the 3rd subcarrier, the 4th son carry Base station hair is obtained in ripple, the 5th subcarrier, the 8th subcarrier, the 9th subcarrier, the 10th subcarrier and the 11st subcarrier The DMRS sent；Or

The 1st subcarrier, the 2nd subcarrier, the 4th subcarrier, the 5th son in selected each OFDM symbol carry The DMRS that base station is sent is obtained in ripple, the 7th subcarrier, the 8th subcarrier, the 11st subcarrier and the 12nd subcarrier；Or Person

The 1st subcarrier, the 2nd subcarrier, the 3rd subcarrier, the 4th son in selected each OFDM symbol carry The DMRS that base station is sent is obtained in ripple, the 9th subcarrier, the 10th subcarrier, the 11st subcarrier and the 12nd subcarrier.
30. terminal according to claim 25, it is characterised in that the second selection module includes：

4th chooses submodule, if the time span for the short TTI is the time span corresponding to seven OFDM symbols, According to the maximum of the quantity of DMRS antenna port, at least one OFDM for not mapping public guide frequency CRS is chosen OFDM symbol.
31. terminal according to claim 30, it is characterised in that the 4th selection submodule includes：

3rd chooses unit, if the quantity for DMRS antenna port is up to 4, in each short TTI, chooses extremely A few OFDM symbol for not mapping public guide frequency CRS.
32. terminal according to claim 31, it is characterised in that the described 3rd, which chooses unit, is used for each described short In TTI, the 3rd OFDM symbol and the 6th OFDM symbol are chosen；Or

In each short TTI, the 4th OFDM symbol and the 6th OFDM symbol are chosen；Or

In each short TTI, the 3rd OFDM symbol and the 7th OFDM symbol are chosen；Or

In each short TTI, the 4th OFDM symbol and the 7th OFDM symbol are chosen；Or

In each short TTI, the 6th OFDM symbol is chosen；Or

In each short TTI, the 7th OFDM symbol is chosen.
33. terminal according to claim 30, it is characterised in that the 4th selection submodule includes：

4th chooses unit, if the quantity for DMRS antenna port is up to 8, in each short TTI, chooses extremely Few two OFDM symbols for not mapping public guide frequency CRS.
34. terminal according to claim 33, it is characterised in that the described 4th, which chooses unit, is used for each described short In TTI, the 3rd OFDM symbol, the 4th OFDM symbol, the 6th OFDM symbol and the 7th OFDM symbol are chosen；Or

In each short TTI, the 6th OFDM symbol and the 7th OFDM symbol are chosen.
35. the terminal according to claim 31 or 33, it is characterised in that the acquisition module includes：

3rd acquisition submodule, if using 1 RB or 12 subcarrier as a unit on frequency domain, selected each Four adjacent two-by-two subcarriers are chosen in OFDM symbol and obtain the demodulated reference signal DMRS that base station is sent, wherein, it is selected Each subcarrier occupy identical frequency domain position in different OFDM symbols.
36. terminal according to claim 35, it is characterised in that the 3rd acquisition submodule is used for selected every The 2nd subcarrier, the 3rd word carrier wave, the 8th subcarrier and the 9th subcarrier are chosen in individual OFDM symbol and obtains base station transmission Demodulated reference signal DMRS.