CN106851827A - For the downlink transmission method and system of unlicensed spectrum - Google Patents

For the downlink transmission method and system of unlicensed spectrum Download PDF

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Publication number
CN106851827A
CN106851827A CN201510883368.1A CN201510883368A CN106851827A CN 106851827 A CN106851827 A CN 106851827A CN 201510883368 A CN201510883368 A CN 201510883368A CN 106851827 A CN106851827 A CN 106851827A
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China
Prior art keywords
time
subframe
downlink
resource block
reference signal
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CN201510883368.1A
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Chinese (zh)
Inventor
周欢
孙鹏
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Beijing Xinwei Telecom Technology Inc
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Beijing Xinwei Telecom Technology Inc
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/04Wireless resource allocation
    • H04W72/044Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446Resources in time domain, e.g. slots or frames
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/12Wireless traffic scheduling
    • H04W72/1263Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1273Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/50Allocation or scheduling criteria for wireless resources
    • H04W72/53Allocation or scheduling criteria for wireless resources based on regulatory allocation policies
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/50Allocation or scheduling criteria for wireless resources
    • H04W72/535Allocation or scheduling criteria for wireless resources based on resource usage policies

Abstract

For the downlink transmission method and system of unlicensed spectrum.The downlink transmission method includes:According to the symbol numbers of part subframe, symbol division is carried out successively since one end of part subframe;According to the symbol numbers and predistribution resource block size, the schedulable resource block size of the part subframe is calculated;According to the schedulable resource block size and the symbol numbers, the time-frequency lattice of downlink transfer are calculated;By PDSCH resources and downlink reference signal, by default mapping ruler, mapping to the time-frequency lattice carries out downlink transfer, wherein, the mapping position of the PDSCH resources and the downlink reference signal is not overlapped.The present invention can solve effectively to carry out the technical problem of downlink transfer in the subframe of part, improve the handling capacity of communication system.

Description

For the downlink transmission method and system of unlicensed spectrum
Technical field
The present invention relates to communication technical field, the more particularly, to downlink transmission method and system of unlicensed spectrum.
Background technology
Third generation partner program (3rdGeneration Partnership Project, 3GPP) at Rel-13 editions Mandate frequency spectrum auxiliary is introduced in this and accesses (Licensed-Assisted Access, LAA) technology, i.e., in unlicensed spectrum The unlicensed spectrum of loading mobile communication business, such as 5GHz.In unlicensed spectrum, mainly there is Wireless Fidelity at present The system such as (Wireless Fidelity, WiFi), bluetooth, radar and medical treatment is being used.Due in unlicensed spectrum system it is many Sample and complexity, will solve the coexistence problems between different system, and a basic principle is that requirement different system can be with justice Ground takes unlicensed spectrum.Accordingly, it would be desirable to a kind of technical scheme can be solved between the LAA systems in unlicensed spectrum, or Transmission collision problem between the systems such as LAA and WiFi.At present, in 3GPP standards meetings, the solution party on coexistence problems Case is tended to use the method first monitored and transmit (Listen-before-talk, LBT) again.
Each department have regulation to the maximum holding time of unlicensed spectrum, and LAA base stations can be occupied non-after LBT is successfully accessed The time of frequency spectrum is authorized to be less than or equal to the maximum holding time, therefore, the turn-on time of LBT is possible to be not located at conventional subframe Edge or OFDM (Orthogonal Frequency Division Multiplexing, OFDM) symbol side Edge.Now the time interval of LAA downlink transfers is possible to not be a complete conventional subframe, but a part subframe, its In, the length of conventional subframe is 1 millisecond (millisecond, ms).If unreasonable occupancy part subframe, can cause time-frequency The waste of resource.How downlink reference signal, such as bearing downlink physical channel resources, physics normally sent in the subframe of part DSCH Downlink Shared Channel (Physical Downlink Shared Channel, PDSCH), Physical Downlink Control Channel (Physical Downlink Control Channel, PDCCH), Physical Control Format Indicator Channel (Physical Control Format Indicator Channel, PCFICH), physical mixed automatic re-transmission indicating channel (Physical Hybrid ARQ Indicator Channel, PHICH) and enhancing Physical Downlink Control Channel (Enhanced Physical Downlink Control Channel, ePDCCH) etc., to support the content of the aspects such as downlink data transmission currently or open Journal of Sex Research problem.
The content of the invention
In view of this, the embodiment of the present invention provides the downlink transmission method and system for unlicensed spectrum, to solve The technical problem of downlink transfer is effectively carried out in the subframe of part, the handling capacity of communication system is improved indirectly.
The embodiment of the present invention uses following technical scheme:
In a first aspect, the embodiment of the present invention provides a kind of downlink transmission method for unlicensed spectrum, including:
According to the symbol numbers of part subframe, symbol division is carried out successively since one end of part subframe;
According to symbol numbers and predistribution resource block size, the schedulable resource block size of calculating section subframe;
According to schedulable resource block size and symbol numbers, the time-frequency lattice of downlink transfer are calculated;
By PDSCH resources and downlink reference signal, by default mapping ruler, mapping to time-frequency lattice carries out downlink transfer, its In, the mapping position of PDSCH resources and downlink reference signal is not overlapped.
Second aspect, the embodiment of the present invention is also corresponded to and provides a kind of downlink transmission system for unlicensed spectrum, including:
Symbol division unit, is set to the symbol numbers according to part subframe, enters successively since one end of part subframe Row symbol is divided;
Schedulable resource block size computing unit, is set to according to symbol numbers and predistribution resource block size, calculating part The schedulable resource block size of molecule frame;
Time-frequency lattice computing unit, is set to according to schedulable resource block size and symbol numbers, calculate downlink transfer when Frequency lattice;
Downlink transfer unit, is set to PDSCH resources and downlink reference signal, by default mapping ruler, when mapping to Frequency lattice carry out downlink transfer, wherein, the mapping position of PDSCH resources and downlink reference signal is not overlapped.
In sum, technical solution of the present invention is according to the symbol numbers of part subframe, since one end of part subframe according to It is secondary to carry out symbol division;According to symbol numbers and predistribution resource block size, the schedulable resource block size of calculating section subframe; Then according to schedulable resource block size and symbol numbers, the time-frequency lattice of downlink transfer are calculated;By PDSCH resources and descending reference Signal, by default mapping ruler, mapping to time-frequency lattice carries out downlink transfer, wherein, PDSCH resources and downlink reference signal reflect Position is penetrated not overlap.Technical solution of the present invention carries out symbol division by part subframe, defines the structure of part subframe, meter The schedulable resource block size and time-frequency lattice of calculating section molecule frame, even if turn-on times of the LBT in unlicensed spectrum is not position In the edge of conventional subframe, still ensure that communication system effectively transmits down physical channel resource and descending in the subframe of part Reference signal, by making full use of running time-frequency resource, improves the handling capacity of communication system indirectly.
Brief description of the drawings
Fig. 1 a are a kind of flow charts of downlink transmission method for unlicensed spectrum that the embodiment of the present invention one is provided.
Fig. 1 b are the structural representations of the first part subframe that the embodiment of the present invention one is provided.
Fig. 1 c are second structural representations of part subframe that the embodiment of the present invention one is provided.
Fig. 2 a are the flow charts of the downlink transmission method that the another kind that the embodiment of the present invention two is provided is used for unlicensed spectrum.
Fig. 2 b are the CRS mapping ruler schematic diagrames of the first part subframe that the embodiment of the present invention two is provided.
Fig. 2 c are the CRS mapping ruler schematic diagrames of second part subframe that the embodiment of the present invention two is provided.
Fig. 2 d are the DMRS mapping ruler schematic diagrames of the first part subframe that the embodiment of the present invention two is provided.
Fig. 2 e are the DMRS mapping ruler schematic diagrames of second part subframe that the embodiment of the present invention two is provided.
Fig. 3 is a kind of structure chart of downlink transmission system for unlicensed spectrum that the embodiment of the present invention three is provided.
Fig. 4 a are the structure charts of the downlink transmission system that the another kind that the embodiment of the present invention four is provided is used for unlicensed spectrum.
Fig. 4 b are the structure charts of the down control channel transmission unit that the embodiment of the present invention four is provided.
Specific embodiment
Below in conjunction with the accompanying drawings, the specific embodiment of the invention is explained in detail.It is understood that described herein Specific embodiment is only used for explaining the present invention, rather than limitation of the invention.In addition, for the ease of description, only being shown in accompanying drawing Part related to the present invention rather than full content.
Embodiment one
As shown in Figure 1a, it is a kind of downlink transmission method for unlicensed spectrum provided in an embodiment of the present invention, should Method can be applicable in the communication network using LAA technologies, and the method may comprise steps of:
S110, the symbol numbers according to part subframe, carry out symbol division successively since one end of part subframe.
In the present embodiment, part subframe refers to length of its length less than or equal to 1ms, i.e. part subframe less than or equal to conventional subframe Degree.The symbol numbers of part subframe can be according to time quantum TSTo calculate, according to 3GPP technical specifications (Technical Specification, TS) 36.211 files, TSIt is desirableSecond, the symbol numbers X of part subframe can be according to part The length T of subframe is calculated, i.e.,If the symbol numbers X of known portions subframe, can be from the starting of part subframe End, it is also possible to symbol division is carried out to part subframe successively since the end end of part subframe, if from the starting of part subframe End proceed by symbol division, then can fixed part subframe most start sign magnitude.As shown in Figure 1 b, by the symbol in the subframe of part Number 0,1 is designated as successively ..., X-1.If from the end end of part subframe proceed by symbol divide, can fixed part subframe most Latter sign magnitude, as illustrated in figure 1 c, N-X, N-X+1 ..., N-1 is designated as by the symbol in the subframe of part successively, wherein, N is the symbol numbers of conventional subframe, for conventional cyclic prefix (Cyclic Prefix, CP), N desirable 14, for extension CP, N Desirable 12.
It should be noted that the symbol in the subframe of embodiment of the present invention part is preferably OFDM symbol, or use Other modulation systems, such as multi-system digital phase modulation (Multiple Phase Shift Keying, MPSK), multi-system Digital amplitude modulation (Multiple Amplitude Shift Keying, MASK), Multiple Frequency Shift Keying (Multiple Frequency Shift Keying, MFSK) or M-ary Quadrature Amplitude modulation (Multiple Quadrature Amplitude Modulation, MQAM) etc. modulation system, and these modulation systems combine any modulation symbol for obtaining.
S120, according to symbol numbers and predistribution resource block size, the schedulable resource block size of calculating section subframe.
In this step, the symbol numbers X for being obtained according to above-mentioned steps S110, can be calculated part according to following formula (1) The schedulable resource block size of subframe,
Wherein, NPRBIt is schedulable resource block size, NPRBIt is predistribution resource block size,It is part subframe Symbol numbers,Q can be corresponding respectively to take 11 or 9 according to conventional CP and the type of extension CP.
S130, according to schedulable resource block size and symbol numbers, calculate the time-frequency lattice of downlink transfer.
Time-frequency lattice for downlink transfer can be determined have by the symbol numbers of domain portion subframe and subcarrier in frequency domain number For body, the position of the resource particle (Resource Element, RE) on time-frequency lattice can be represented with two-dimensional coordinate (k, l), its In, k is the subcarrier in frequency domain position of time-frequency lattice, It is a schedulable The corresponding subcarrier number of Resource Block, the subcarrier in frequency domain interval for 15KHz,Desirable 12, the frequency domain for 7.5KHz Subcarrier spacing,Desirable 24, l is the time-domain symbol position of time-frequency lattice,Time-frequency lattice It is determined that after the completion of, the corresponding modulation symbol of downlink data can be mapped on the RE positions (k, l) in time-frequency lattice, by corresponding frequency Domain and time-domain resource are carried, and complete downlink data transmission.
S140, by PDSCH resources and downlink reference signal, by default mapping ruler, mapping to time-frequency lattice carries out descending biography It is defeated.
Downlink reference signal may include cell special reference (Cell-specific Reference Signal, CRS), demodulated reference signal (Demodulation reference signals, DMRS), user's DRS (Dedicated Reference Signal) (UE- Specific Reference Signal, DM-RS) and channel condition information (Channel State Information, CSI) Reference signal (CSI Reference Signal, CSI-RS) etc..Wherein, CRS and DMRS can be used for down channel estimate and under The correlation demodulation of row channel, such as PDSCH, and the control channel such as PDCCH, PCFICH, PHICH and ePDCCH solution Adjust, CRS can be transmitted on antenna port 0~3, and DMRS can be transmitted on antenna port 7~14;DM-RS can be used for PDSCH channels Demodulation, can transmit on antenna port 5,7~8, and CSI-RS can be used for channel quality and indicate (Channel Quality Indicator, CQI), pre-coding matrix instruction (Precoding Matrix Indicator, PMI) and order instruction (rank Indication, RI) etc. information measurement, CSI-RS can carry out single antenna port, double antenna port, four antenna ports and eight days Line end port transmission, the antenna port supported corresponds to 15,15~16,15~18 and 15~22 respectively.
In this step, PDSCH resources and downlink reference signal are mapped into time-frequency lattice, is only mapped to the right of part subframe In answering symbol, and the character position of other non-part subframes is not mapped then, and default mapping ruler can be reflected using centralization Penetrate, it would however also be possible to employ distributed mapping, ensureing the nonoverlapping basis of mapping position of PDSCH resources and downlink reference signal On, PDSCH resources and above-mentioned downlink reference signal can be mapped on any RE positions of time-frequency lattice, the embodiment of the present invention pair The default mapping ruler of PDSCH resources and downlink reference signal does not do any specific restriction, but the embodiment of the present invention two is provided Preferred embodiment.
Technical scheme provided in an embodiment of the present invention according to the symbol numbers of part subframe, since one end of part subframe Symbol division is carried out successively;Secondly according to symbol numbers and predistribution resource block size, the schedulable resource of calculating section subframe Block size;Then according to schedulable resource block size and symbol numbers, the time-frequency lattice of downlink transfer are calculated;By PDSCH resources and Downlink reference signal, by default mapping ruler, mapping to time-frequency lattice carries out downlink transfer, wherein, PDSCH resources and descending reference The mapping position of signal is not overlapped.Technical solution of the present invention carries out symbol division by part subframe, defines part subframe Structure, the schedulable resource block size and time-frequency lattice of part subframe are further calculated, even if LBT is in unlicensed spectrum Turn-on time is not located at the edge of conventional subframe, still ensures that communication system effectively transmits downlink physical in the subframe of part Channel resource and downlink reference signal, by making full use of running time-frequency resource, improve the handling capacity of communication system indirectly.
Embodiment two
On the basis of the embodiment of the present invention one, the present embodiment provides another downlink transfer side for unlicensed spectrum Method, as shown in Figure 2 a, the embodiment of the present invention can increase step S100, step S150 and step on the basis of embodiment one S160。
S100, one end of part subframe is alignd with one end of conventional subframe, wherein, the length of part subframe is less than or equal to The length of conventional subframe.
As shown in Fig. 1 b, 1c, one end of part subframe is alignd with one end of conventional subframe, can be by the starting of part subframe End and the justified margin of conventional subframe, it is also possible to by the justified margin for terminating end and conventional subframe of part subframe.
S150, the position that the preceding M of time-frequency lattice meets is set to control zone, wherein M is 1,2,3 or 4.
Embodiment one is refer to, the first part subframe structure as shown in Figure 1 b can meet the preceding M of part subframe Corresponding time-frequency case is installed and is set to control zone, it is necessary to illustrate, the big I of control zone is indicated by PCFICH, can joined Examine the time-frequency lattice for being provided with control zone corresponding to the first the part subframe structure shown in Fig. 2 b and Fig. 2 d, reflecting for CRS Mode is penetrated, M is preferably 2, the mapping mode for DMRS, M is preferably 1.
S160, down control channel resources are mapped to control zone carry out downlink transfer, wherein, down control channel includes PDCCH, PCFICH, PHICH and ePDCCH.
In the present embodiment, downlink reference signal is preferably CRS and/or DMRS, the mapping for CRS, presets mapping ruler Can as the following formula (2), CRS be mapped on the RE positions (k, l) of time-frequency lattice,
Wherein, It is the corresponding subcarrier of schedulable Resource Block Number,P is for transmitting the descending reference letter Number antenna port,
Part subframe can may be defined as 7 using the OFDM symbol for adding routine CP, the OFDM symbol number of part subframe.Such as The CRS mappings of the first the part subframe shown in Fig. 2 b, can proceed by symbol and divide from the initiating terminal of part subframe, that is, fix Part subframe most starts sign magnitude, then the OFDM symbol in the subframe of part can be successively designated as into 0,1 ..., and 6.Now, can basis The default mapping ruler of formula (2), CRS is mapped at the 1st and the 5th OFDM symbol position, i.e. l=0 and l=4.Such as Fig. 2 c The CRS mappings of second shown part subframe, can proceed by symbol and divide, be i.e. fixed part from the end end of part subframe Subframe last symbol numerical value, then can successively be designated as 7,8 ... by the OFDM symbol in the subframe of part, and 13.Now, can basis The default mapping ruler of formula (2), CRS is mapped at OFDM symbol position l=7 and l=11.Above two part subframe structure Can support the double antenna port transmission of CRS, the CRS of different antennae port frequency domain interval be 2 subcarriers, in time domain interval 3 Individual OFDM symbol, CRS on same antenna port frequency domain interval be 5 subcarriers, in 3 OFDM symbols of time domain interval;It is right In the first the part subframe structure shown in Fig. 2 b, can be by the first two OFDM symbol position of time-frequency lattice, i.e. l=0 and l=1 pairs The time-frequency region answered is set to control zone, therefore, down control channel includes PDCCH, PCFICH, PHICH and ePDCCH, can reflect Penetrate the 1st and the 2nd OFDM symbol position, the mapping position of down control channel and CRS is not overlapped, except CRS and descending control Outside the mapping position of channel processed, other RE positions all can be used for the mapping of PDSCH resources.
Mapping for DMRS, default mapping ruler can be the RE positions that DMRS is mapped to time-frequency lattice as the following formula (3) On (k, l),
Wherein Do not overlapped with the mapping position for ensureing DMRS and CRS.
Part subframe also can may be defined as 7 using the OFDM symbol for adding routine CP, the OFDM symbol number of part subframe. The DMRS mappings of the first part subframe as shown in Figure 2 d, can proceed by symbol and divide, i.e., from the initiating terminal of part subframe Fixed part subframe most starts sign magnitude, then the OFDM symbol in the subframe of part can be successively designated as into 0,1 ..., and 6.Now, may be used According to the default mapping ruler of formula (3), DMRS is mapped at the 6th and the 7th OFDM symbol position, i.e. l=5 and l=6. The DMRS mappings of second part subframe as shown in Figure 2 e, can proceed by symbol and divide, i.e., from the end end of part subframe Fixed part subframe last symbol numerical value, then can successively be designated as 7,8 ... by the OFDM symbol in the subframe of part, and 13.This When, DMRS can be mapped at OFDM symbol position l=12 and l=13 according to the default mapping ruler of formula (3).Above two Part subframe structure can support that eight antenna ports of DMRS are transmitted, and the DMRS on antenna port { 7,8,11,13 } is in frequency domain interval Be 4 subcarriers, the DMRS on antenna port { 9,10,12,14 } frequency domain interval be 4 subcarriers, antenna port 7,8, 11,13 } and the DMRS of { 9,10,12,14 } is mapped in adjacent frequency domain position.For the first the part subframe knot shown in Fig. 2 d Structure, can be set to control zone by the 1st of time-frequency lattice the corresponding time-frequency region of OFDM symbol position, i.e. l=0.Therefore, descending control Channel processed includes PDCCH, PCFICH, PHICH and ePDCCH, can be mapped in the 1st OFDM symbol position, down control channel and The mapping position of DMRS is not overlapped, and in addition to the mapping position of DMRS and down control channel, other RE positions are all available In the mapping of PDSCH resources.
In the present embodiment, by default mapping ruler, downlink reference signal CRS and/or DMRS are transmitted in the subframe of part, closed Reason ground takes the RE positions in the time-frequency lattice of part subframe, has saved running time-frequency resource, by defining the first part subframe structure, Reserved control zone, effectively completes the mapping and transmission of down control channel resources.
In sum, the embodiment of the present invention is according to the symbol numbers of part subframe, since one end of part subframe successively Carry out symbol division;According to symbol numbers and predistribution resource block size, the schedulable resource block size of calculating section subframe;So Afterwards according to schedulable resource block size and symbol numbers, the time-frequency lattice of downlink transfer are calculated;PDSCH resources and descending reference are believed Number, by default mapping ruler, mapping to time-frequency lattice carries out downlink transfer, wherein, the mapping of PDSCH resources and downlink reference signal Position does not overlap.Technical solution of the present invention carries out symbol division by part subframe, defines the structure of part subframe, enters one Step calculates the schedulable resource block size and time-frequency lattice of part subframe, even if turn-on times of the LBT in unlicensed spectrum is not Be be located at conventional subframe edge, still ensure that communication system effectively transmitted in the subframe of part down physical channel resource and Downlink reference signal, by making full use of running time-frequency resource, improves the handling capacity of communication system indirectly.
Herein below is the embodiment of the downlink transmission system for unlicensed spectrum provided in an embodiment of the present invention.Under this The embodiment of row Transmission system belongs to same design with the embodiment of above-mentioned downlink transmission method, the implementation of the downlink transmission system The unspecified content of example refers to the content described in the embodiment of above-mentioned downlink transmission method.
Embodiment three
On the basis of the technical scheme that above method embodiment of the present invention is recorded, as shown in figure 3, it is the embodiment of the present invention A kind of downlink transmission system 300 for unlicensed spectrum for providing, downlink transmission system 300 includes:Symbol division unit 310, schedulable resource block size computing unit 320, time-frequency lattice computing unit 330 and downlink transfer unit 340.Wherein,
Symbol division unit 310, is set to the symbol numbers according to part subframe, since one end of part subframe successively Carry out symbol division;
Schedulable resource block size computing unit 320, is set to, according to symbol numbers and predistribution resource block size, calculate The schedulable resource block size of part subframe;
Time-frequency lattice computing unit 330, is set to, according to schedulable resource block size and symbol numbers, calculate downlink transfer Time-frequency lattice;
Downlink transfer unit 340, is set to, by PDSCH resources and downlink reference signal, by default mapping ruler, map to Time-frequency lattice carry out downlink transfer, wherein, the mapping position of PDSCH resources and downlink reference signal is not overlapped.
In the present embodiment, symbol division is carried out to part subframe, define the structure of part subframe, further calculate portion The schedulable resource block size and time-frequency lattice of molecule frame, though turn-on times of the LBT in unlicensed spectrum be not located at routine The edge of subframe, still ensures that communication system effectively transmits down physical channel resource and descending reference letter in the subframe of part Number, by making full use of running time-frequency resource, the handling capacity of communication system is improve indirectly.
Example IV
On the basis of the embodiment of the present invention three, as shown in fig. 4 a, downlink transfer of the embodiment of the present invention in embodiment three Alignment unit 301 and down control channel transmission unit 350 can also be increased in system 300.Wherein,
Alignment unit 301, is set to align one end of part subframe with one end of conventional subframe, wherein, part subframe Length less than or equal to conventional subframe length.
As shown in Figure 4 b, down control channel transmission unit 350, specifically includes control zone setup module 351 and descending control Transmission module 352 processed.Wherein,
Control zone setup module 351, is arranged to for the position that the preceding M of time-frequency lattice meets to be set to control zone, and wherein M is 1st, 2,3 or 4;
Down control channel transport module 352, be set to by down control channel resources map to control zone carry out it is descending Transmission, wherein, down control channel includes PDCCH, PCFICH, PHICH and ePDCCH, down control channel resources, PDSCH moneys Source and the mapping position non-overlapping copies of downlink reference signal.
The embodiment of the present invention two is refer to, in the present embodiment, for the mapping of downlink reference signal CRS and/or DMRS, in advance If mapping ruler can be corresponded to and is configured by formula (2) and/or formula (3), CRS and/or DMRS are mapped to the RE positions of time-frequency lattice It is transmitted on (k, l).With reference to the first part subframe structure that Fig. 2 b and Fig. 2 d are shown respectively, Fig. 2 b and Fig. 2 d are respectively provided with There is the control zone of transmission down control channel, the control zone can be used for the descending control such as PDCCH, PCFICH, PHICH and ePDCCH The mapping and transmission of channel resource.
In the present embodiment, by default mapping ruler, downlink reference signal CRS and/or DMRS are transmitted in the subframe of part, closed Reason ground takes the RE positions in the time-frequency lattice of part subframe, has saved running time-frequency resource, by defining the first part subframe structure, Reserved control zone, effectively completes the mapping and transmission of down control channel resources.
The preferred embodiments of the present invention are the foregoing is only, is not intended to limit the invention, for those skilled in the art For, the present invention can have various changes and change in specific embodiment.All institutes within spirit and principles of the present invention Any modification, equivalent, obvious modification made etc., should be included within the scope of the present invention.

Claims (10)

1. a kind of downlink transmission method for unlicensed spectrum, including:
According to the symbol numbers of part subframe, symbol division is carried out successively since one end of part subframe;
According to the symbol numbers and predistribution resource block size, the schedulable resource block size of the part subframe is calculated;
According to the schedulable resource block size and the symbol numbers, the time-frequency lattice of downlink transfer are calculated;
By PDSCH resources and downlink reference signal, by default mapping ruler, mapping to the time-frequency lattice carries out downlink transfer, its In, the mapping position of the PDSCH resources and the downlink reference signal is not overlapped.
2. downlink transmission method as claimed in claim 1, wherein, it is described by PDSCH resources and downlink reference signal, by default Mapping ruler, maps to after the time-frequency lattice carry out downlink transfer, also includes:
The position that the preceding M of the time-frequency lattice meets is set to control zone, wherein M is 1,2,3 or 4;
Down control channel resources are mapped into the control zone carries out downlink transfer, wherein, down control channel includes PDCCH, PCFICH, PHICH and ePDCCH, the down control channel resources, the PDSCH resources and the descending reference letter Number mapping position non-overlapping copies.
3. downlink transmission method as claimed in claim 1, wherein, the downlink reference signal is CRS and/or DMRS.
4. downlink transmission method as claimed in claim 3, wherein, the default mapping ruler includes:
The CRS is mapped to the position (k, l) of the time-frequency lattice, k = 6 × m + CRS s h i f t l = 0 , N s y m b D L - 3 ; And/or
The DMRS is mapped to the position (k, l) of the time-frequency lattice, k = 5 × n + DMRS s h i f t l = N s y m b D L - 1 , N s y m b D L - 2 ;
Wherein, k is the subcarrier in frequency domain position of the time-frequency lattice, and l is the time-domain symbol position of the time-frequency lattice, m=0,1 ...,NPRBIt is the schedulable resource block size,It is the corresponding subcarrier number of schedulable Resource Block,P is the antenna port for transmitting the downlink reference signal,It is the symbol numbers,N=0,1 ..., DMRS s h i f t = 0 , p ∈ { 7 , 8 , 11 , 13 } 1 , p ∈ { 9 , 10 , 12 , 14 } .
5. the downlink transmission method as described in any one of Claims 1 to 4, wherein, the symbol numbers according to part subframe, Before carrying out symbol division successively since one end of part subframe, also include:
One end of part subframe is alignd with one end of conventional subframe, wherein, the length of the part subframe is less than or equal to described The length of conventional subframe.
6. a kind of downlink transmission system for unlicensed spectrum, including:
Symbol division unit, is set to the symbol numbers according to part subframe, is accorded with successively since one end of part subframe Number divide;
Schedulable resource block size computing unit, is set to, according to the symbol numbers and predistribution resource block size, calculate institute State the schedulable resource block size of part subframe;
Time-frequency lattice computing unit, is set to, according to the schedulable resource block size and the symbol numbers, calculate downlink transfer Time-frequency lattice;
Downlink transfer unit, is set to PDSCH resources and downlink reference signal, by default mapping ruler, when mapping to described Frequency lattice carry out downlink transfer, wherein, the mapping position of the PDSCH resources and the downlink reference signal is not overlapped.
7. downlink transmission system as claimed in claim 6, also includes, down control channel transmission unit, the descending control Channel Transport Unit, specifically includes:
Control zone setup module a, position for being arranged to meet the preceding M of the time-frequency lattice is set to control zone, wherein M is 1, 2nd, 3 or 4;
Down control channel transport module, being set to for down control channel resources to map to the control zone carries out descending biography It is defeated, wherein, down control channel includes PDCCH, PCFICH, PHICH and ePDCCH, the down control channel resources, described The mapping position non-overlapping copies of PDSCH resources and the downlink reference signal.
8. downlink transmission system as claimed in claim 6, wherein, the downlink reference signal is CRS and/or DMRS.
9. downlink transmission system as claimed in claim 8, wherein, the default mapping ruler includes:
The CRS is mapped to the position (k, l) of the time-frequency lattice, k = 6 × m + CRS s h i f t l = 0 , N s y m b D L - 3 ;
And/or
The DMRS is mapped to the position (k, l) of the time-frequency lattice, k = 5 × n + DMRS s h i f t l = N s y m b D L - 1 , N s y m b D L - 2 ;
Wherein, k is the subcarrier in frequency domain position of the time-frequency lattice, and l is the time-domain symbol position of the time-frequency lattice, m=0,1 ...,NPRBIt is the schedulable resource block size,It is the corresponding subcarrier number of schedulable Resource Block,P is the antenna port for transmitting the downlink reference signal,It is the symbol numbers,N=0,1 ..., DMRS s h i f t = 0 , p ∈ { 7 , 8 , 11 , 13 } 1 , p ∈ { 9 , 10 , 12 , 14 } .
10. the downlink transmission system as described in any one of claim 6~9, also includes:
Alignment unit, is set to align one end of part subframe with one end of conventional subframe, wherein, the length of the part subframe Length of the degree less than or equal to the conventional subframe.
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