CN102571662A - Transmitting method and device for downlink data - Google Patents
Transmitting method and device for downlink data Download PDFInfo
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- CN102571662A CN102571662A CN201010616074XA CN201010616074A CN102571662A CN 102571662 A CN102571662 A CN 102571662A CN 201010616074X A CN201010616074X A CN 201010616074XA CN 201010616074 A CN201010616074 A CN 201010616074A CN 102571662 A CN102571662 A CN 102571662A
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Abstract
The invention discloses a transmitting method of downlink data and a base station. The transmitting method and the base station are used for solving the problem that the load of an uplink subframe is greater because downlink data transmitted in a DwPTS (Downlink Pilot Transmission Special Frame) occupies the progress of HARQ (Hybrid Automatic Repeat Request) in a TD-LET (Time Division Duplexing -Long Time Evolution) in the prior art. The transmitting method comprises the following steps of: selecting a plurality of OFDM (Orthogonal Frequency Division Multiplexing) symbols at least comprising all OFDM symbols in a data region from all OFDM symbols contained in the DwPTS; bearing a coding redundancy version corresponding to the same downlink data in a downlink conventional subframe adjacent to the DwPTS and the selected OFDM symbols; and scheduling the coding redundancy version through a control region in the downlink conventional subframe and transmitting the coding redundancy version.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of sending method and device of downlink data.
Background technology
In the prior art; Substep code division multiple access (TD-SCDMA at that time; TimeDivision-Synchronous Code Division Multiple Access) DL/UL (downlink/uplink) business time-slot proportioning 4: 2 o'clock; If time-division Long Term Evolution (TD-LTE; Time Division DuplexingLong Time Evolution) system is adjacent will coexist with it frequently, and the TD-LTE system need adopt 3: 1 business time-slot proportioning, and DwPTS in the descending special subframe: protection time slot GP: up special subframe UpPTS length ratio is could fully avoid interference uplink and downlink timeslot between at 3: 9: 2.In order to improve the efficiency of transmission under this scene; Existing scheme proposes the DwPTS with the TD-LTE system: the ratio optimization of GP: UpPTS is 6: 6: 2; Thereby make DwPTS that 6 OFDM (OFDM arranged; OrthogonalFrequency Division Multiplexing) symbol can be used for downlink transfer, to improve descending efficiency of transmission.Wherein, comprising proportioning is 6: 6: 2 DwPTS: the wireless frame structure sketch map of GP: UpPTS is please with reference to Fig. 1.
In general; Preceding 1 or 2 OFDM symbols in above-mentioned 6 OFDM symbols of DwPTS can send PDCCH, PHICH, and remaining like this 4 or 5 OFDM symbols can be used for transmitting downlink data (comprising the RE (Resource Elements) that is used for bearing downlink demodulated reference signal Demodulation Reference Signal).The downgoing control signal that transmits among this DwPTS is used for dispatching the downlink data that this DwPTS transmits.
From the above; When TD-LTE adopts 3: 1 business time-slot proportioning; Because the downlink data that transmits among the DwPTS also can take a HARQ process; Therefore sub-frame of uplink need feed back ACK/NACK (confirming/unconfirmed) information of 4 descending time slots, so just causes the ACK/NACK of sub-frame of uplink to load bigger.
Summary of the invention
The embodiment of the invention provides a kind of sending method and base station of downlink data, in order to solve in the TD-LTE of prior art system, causes the bigger problem of sub-frame of uplink load owing to the downlink data that transmits among the DwPTS takies the HARQ process.
The embodiment of the invention adopts following technical scheme:
A kind of sending method of downlink data comprises:
From all orthogonal frequency division multiplex OFDM symbols that descending special subframe DwPTS comprises, choose and comprise in the data area all OFDM symbols at least at interior a plurality of OFDM symbols; And the coding redundancy version of the same downlink data of correspondence is carried in the descending conventional subframe adjacent with DwPTS and the OFDM symbol of choosing; And dispatch said coding redundancy version through the control area of said descending conventional subframe and send.
A kind of downlink data dispensing device comprises:
Choose the unit, be used for all OFDM symbols of comprising from descending special subframe DwPTS, choose and comprise in the data area all OFDM symbols at least at interior a plurality of OFDM symbols; Load bearing unit is used for the coding redundancy version of the same downlink data of correspondence is carried on descending conventional subframe adjacent with DwPTS and the OFDM symbol of choosing unit selection; Transmitting element is used for the control area through said descending conventional subframe, and the scheduling load bearing unit is carried on said descending conventional subframe and sends with the said coding redundancy version of choosing in the OFDM symbol of unit selection.
The beneficial effect of the embodiment of the invention is following:
The such scheme that adopts the embodiment of the invention to provide takies a HARQ process jointly after the OFDM symbol and the adjacent descending conventional subframe of data area among the DwPTS bundled, so has alleviated the load of sub-frame of uplink.
Description of drawings
Fig. 1 is 6: 6: 2 DwPTS for comprising proportioning: the wireless frame structure sketch map of GP: UpPTS;
Fig. 2 is the RE sketch map that the OFDM symbol of DwPTS is comprised;
Fig. 2 a is the idiographic flow sketch map of the sending method of a kind of downlink data of providing of the embodiment of the invention;
Fig. 2 b comprises the wireless frame structure sketch map that adopts the resulting eldest son's frame of scheme that the embodiment of the invention provides;
The concrete structure sketch map of the dispensing device method of a kind of downlink data that Fig. 3 provides for the embodiment of the invention.
Embodiment
In the TD-LTE system that solves in prior art, owing to taking the HARQ process, the downlink data that transmits among the DwPTS causes the bigger problem of sub-frame of uplink load, and the inventor has carried out following analysis to OFDM symbol of the prior art:
In the prior art, to proportioning be 6: 6: 2 DwPTS: the situation of GP: UpPTS, a DwPTS takies 12 continuous sub-carriers on frequency domain, on time domain, take 6 continuous OFDM symbols.Fig. 2 is the sketch map of the Resource Unit (RE, Resource Element) that comprised at the OFDM of DwPTS symbol.The RE that minimum grid among the figure comprises in order to indication OFDM symbol, a corresponding number of sub-carrier on the RE frequency domain, corresponding OFDM symbol on the time-domain.The the 1st, 2 OFDM symbol among the figure constitutes the control area, back 4 OFDM symbol composition datas zone.Physical downlink control channel PDCCH, Physical Control Format Indicator Channel PCFICH and Physical HARQ Indicator Channel PHICH are mapped on the control area of DwPTS.PDCCH is used for the bearing resource assignment information, comprises power control information; PCFICH is used in reference to the number that is shown in the employed OFDM symbol of transmission PDCCH signal among the DwPTS; PHICH is used to carry the HARQ response message.The RE that is filled to black among Fig. 2 is for being used for the RE (RE of transmitting downlink data also claims data RE) of transmitting downlink data, and the RE that is filled with oblique line then is used to transmit demodulated reference signal (DM-RS, Demodulated Reference Signal).In addition, the RE of transmission public reference signal (CRS, CommonReference Signal) or channel state information reference signals (CSI-RS, Channel StateInformation Reference Signal) does not mark in the drawings.
The signal type that each RE sent in the OFDM symbol that comprises according to DwPTS as shown in Figure 2; The embodiment of the invention provides a kind of delivery plan of downlink data; Core concept is from the OFDM symbol that DwPTS comprises, to choose all OFDM symbols of comprising at least in the data area and bundlees in interior OFDM symbol and conventional subframe adjacent to DwPTS; Obtain one and virtual comprise more " the eldest son's frame " that is used to send the OFDM symbol of downlink data, and the downlink data that whole eldest son's frame is sent is dispatched by the control area (control area of the above-mentioned conventional subframe that promptly bundlees) of this eldest son's frame.Because whole eldest son's frame takies a HARQ process, thereby the downlink data that transmits among the DwPTS takies a HARQ process no longer separately, the load that makes sub-frame of uplink send ACK/NACK has obtained alleviating.
Below in conjunction with accompanying drawing, the such scheme that the embodiment of the invention is provided is elaborated.
The embodiment of the invention at first provides a kind of sending method of downlink data, is applied in the TD-LTE system, and this method comprises the following step shown in Fig. 2 a:
Through above-mentioned steps, be the equal of that a plurality of OFDM symbols of choosing and this routine subframe are bundled, formed eldest son's frame (sketch map of this eldest son's frame is shown in Fig. 2 b).Control area (being generally the last to three OFDM symbols of this eldest son's frame) by this eldest son's frame is distributed unitedly all downlink datas (downlink data that comprises the OFDM downlink data that carries and the OFDM symbols carry of choosing of former conventional subframe) that carry in this eldest son's frame.Because what in this eldest son's frame, carry is the coding redundancy version of same downlink data, have only a cover cyclic redundancy check (CRC) bit, thereby receiving terminal is to same downlink data feeding back ACK/NAK information, so this eldest son's frame only takies a HARQ process.
Can know according to above-mentioned analysis; This scheme that adopts the embodiment of the invention to provide; When TD-LTE adopts 3: 1 business time-slot proportioning,, but take a HARQ process jointly after bundling with adjacent conventional subframe because the downlink data that transmits among the DwPTS takies a HARQ process no longer separately; Therefore this moment, a sub-frame of uplink only need feed back the ACK/NACK information to 3 descending time slots, thereby had alleviated the load of sub-frame of uplink.Sub-frame of uplink need feed back the scheme to the ACK/NACK information of 4 descending time slots in the prior art, and this scheme that the embodiment of the invention provides can alleviate few 25% load for sub-frame of uplink.
In addition, because eldest son's frame makes encoding block (Code Block) increase, thereby can improve code efficiency to a certain extent.
The number of the OFDM symbol of choosing in the such scheme that the embodiment of the invention provides can be set flexibly; Such as; The OFDM symbol of the control area of DwPTS can need not to redispatch PCFICH or/and physical downlink control channel PDCCH or/and Physical HARQ Indicator Channel PHICH so just can make all OFDM symbols of DwPTS all be used for bundling with the conventional subframe of adjacent transmitting downlink data.When all OFDM symbols that DwPTS is comprised are used to bundle and during transmitting downlink data entirely, this moment, the spectrum efficiency of data service of whole radio frames can reach high value.Particularly, when TD-LTE adopts 3: 1 business time-slot proportioning, generally be that three separately first three of conventional subframe OFDM symbols that are used to send downlink data are used to carry control signal, and preceding two OFDM symbols of DwPTS also are used as the carrying control signal.In such cases; When the proportioning of DwPTS: GP: UpPTS is 6: 6: 2; If choose back 4 OFDM symbols carry downlink datas that DwPTS comprises, can increase (11+11+11+4)/11/3=12% than the downlink data throughput when this proportioning is 3: 9: 2; And when choosing 6 OFDM symbols carry downlink datas that DwPTS comprises, this proportioning is that 6: 6: 2 o'clock downlink data throughput can be that 3: 9: 2 o'clock downlink data throughput increases (11+11+11+6)/11/3=18% than this proportioning.
Need to prove; When TD-LTE adopts 3: 1 business time-slot proportioning; Because three conventional subframes that are used for transmitting downlink data that comprise in the whole radio frames 5ms time slot have enough PDCCH, PHICH resource; Therefore, 6 OFDM symbols that instant DwPTS comprises all are used for the bearing downlink data, also can not have influence on the scheduling of up-downgoing and the ACK/NAK information that sub-frame of uplink feeds back downlink data.Further; In order to reduce the complexity of various reference signal design among the DwPTS; The RE of channel state information reference signals (CSI-RS, Channel State Information Reference Signal) is used to transmit public reference signal (CRS, Common Reference Signal) or/and also can not send out in DwPTS; Saved RE can be used to send downlink data, and only in conventional descending sub frame, sends out CRS and CSI-RS.When all the OFDM symbols bundle in choosing DwPTS, above-mentioned coding redundancy version is carried on the descending conventional subframe adjacent with DwPTS can be: above-mentioned coding redundancy version is carried on the RE and data RE of transmission public reference signal CRS of the data RE of the descending conventional subframe adjacent, the OFDM symbol chosen with DwPTS with concrete scheme in the OFDM symbol of choosing; Maybe this coding redundancy version is carried on the RE and data RE of transmitting channel state information reference signals CSI-RS of the data RE of the descending conventional subframe adjacent with DwPTS, the OFDM symbol chosen; Maybe this coding redundancy version is carried on the RE and data RE of transmission CRS, CSI-RS of the data RE of the descending conventional subframe adjacent with DwPTS, the OFDM symbol chosen.
In addition; In the embodiment of the invention, a plurality of OFDM symbols that also can choose except that the OFDM symbol that sends downgoing control signal bundle, such as; When DwPTS comprises 6 OFDM symbols; The conventional subframe that can choose back 5 OFDM symbols that DwPTS comprises and next-door neighbour's transmitting downlink data bundlees, and sends thereby downlink data is carried in these 5 OFDM symbols of choosing, and that OFDM that is not selected among the DwPTS then still can be used to transmit down control channel.
Also there is following technique effect in the such scheme that the embodiment of the invention provides:
1, in the prior art, DwPTS comprises 6 OFDM symbols altogether, and the OFDM symbol that is used for transmitting downlink data only accounts for wherein 4 or 5; Therefore relative other conventional subframes; Transmit PDCCH among the DwPTS, PHICH and PCFICH expense ratio are bigger, thereby have caused the spectrum efficiency of downstream data traffic of whole subframe lower; And the such scheme that adopts the embodiment of the invention to provide; Because transmit PDCCH among the DwPTS, the expense of PHICH and PCFICH is all transferred to by conventional descending sub frame and provided, therefore can not cause the control signal expense ratio of DwPTS excessive;
2, no matter be that 5 OFDM symbols or 6 OFDM symbols of choosing DwPTS bundle, can reduce the complexity of DwPTS design;
3, in the prior art, occur in DwPTS,, therefore may influence and retransmit the effect that merges so because to be used to retransmit the resource of downlink data less if the downlink data of a conventional subframe retransmits; And behind the such scheme that the employing embodiment of the invention provides; Because DwPTS is used for the OFDM symbol of transmitting downlink data and the conventional subframe of adjacent transmitting downlink data bundlees; Therefore expand the OFDM symbol that is used to retransmit downlink data, solved the problems referred to above that exist in the prior art.
Correspondingly, the embodiment of the invention also provides a kind of device that sends downlink data, and the concrete structure sketch map of this device is as shown in Figure 3, comprises following functional unit:
Choose unit 31, be used for from the orthogonal frequency division multiplex OFDM symbol that descending special subframe DwPTS comprises, choose and comprise in the data area all OFDM symbols at least at interior a plurality of OFDM symbols;
Transmitting element 33 is used for the control area through descending conventional subframe, and scheduling load bearing unit 32 is carried on descending conventional subframe and sends with the said coding redundancy version of choosing in the OFDM symbol of choosing unit 31.
In a preferred embodiment, choose unit 31 and can choose whole OFDM symbols that DwPTS comprises; Or choose among the DwPTS all the OFDM symbols except that the OFDM symbol that sends PDCCH; Or said all OFDM symbols of choosing among the unit selection DwPTS except that the OFDM symbol that sends PHICH; Or choose among the DwPTS all the OFDM symbols except that the OFDM symbol that sends PDCCH and PHICH.
And load bearing unit specifically can be used for the coding redundancy version is carried on all data RE that the OFDM symbol of all Resource Unit RE and the above-mentioned descending conventional subframe of the transmission data that the OFDM symbol chosen comprised is comprised.
In the embodiment of the invention; Bundle several OFDM symbols of DwPTS all symbols with the conventional subframe that is used for the bearing downlink data of next-door neighbour DwPTS; Form one and have more " eldest son's frame " of multi-OFDM symbol, and by being used for the bearing downlink section data in this eldest son's frame of control signal scheduling that carries in this eldest son's frame.Through binding, the time slot that is used for the bearing downlink data in this eldest son's frame partly comprises several OFDM symbols that are used to bundle that the time slot that is used for the bearing downlink data, the DwPTS that are close to DwPTS is selected.
In embodiments of the present invention, be that coding redundancy version with the same downlink data of correspondence is carried in a plurality of OFDM symbols that are selected among above-mentioned conventional subframe and the DwPTS and sends, so this eldest son's frame only take a HARQ process.When transmitting downlink data; Under non-MIMO (multiple-input, multiple-output) antenna configurations; The bit of a code word of eldest son's frame can be mapped to the OFDM symbol of the bearing downlink data that are useful on of this eldest son's frame; Therefore after codeword decoding was carried out at the whole eldest son's frame of reception and to it in the terminal, the terminal only need be to ACK/NAK information of above-mentioned code word feedback.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1. the sending method of a downlink data is characterized in that, comprising:
From all orthogonal frequency division multiplex OFDM symbols that descending special subframe DwPTS comprises, choose and comprise in the data area all OFDM symbols at least at interior a plurality of OFDM symbols; And
The coding redundancy version of the same downlink data of correspondence is carried in the descending conventional subframe adjacent with DwPTS and the OFDM symbol of choosing; And
Dispatching said coding redundancy version through the control area of said descending conventional subframe sends.
2. the method for claim 1 is characterized in that, chooses to comprise at least that all OFDM symbols are specially at interior a plurality of OFDM symbols in the data area:
Choose all OFDM symbols that DwPTS comprises.
3. the method for claim 1 is characterized in that, chooses to comprise at least that all OFDM symbols are specially at interior a plurality of OFDM symbols in the data area:
Choose all OFDM symbols except that the OFDM symbol that sends physical downlink control channel PDCCH among the DwPTS; Or
Choose all OFDM symbols except that the OFDM symbol that sends Physical HARQ Indicator Channel PHICH among the DwPTS; Or
Choose all OFDM symbols except that the OFDM symbol that sends PDCCH and PHICH among the DwPTS.
4. method as claimed in claim 2 is characterized in that, said coding redundancy version is carried in the descending conventional subframe adjacent with DwPTS and the OFDM symbol chosen, is specially:
Said coding redundancy version is carried on the data RE of the descending conventional subframe adjacent with DwPTS, the RE and data RE of transmission public reference signal CRS in the OFDM symbol chosen; Or
Said coding redundancy version is carried on the data RE of the descending conventional subframe adjacent with DwPTS, the RE and data RE of transmitting channel state information reference signals CSI-RS in the OFDM symbol chosen; Or
Said coding redundancy version is carried on the data RE of the descending conventional subframe adjacent with DwPTS, the RE and data RE of transmission CRS, CSI-RS in the OFDM symbol chosen.
5. like the arbitrary described method of claim 1～4, it is characterized in that, said coding redundancy version be carried in said descending conventional subframe and the OFDM symbol chosen, be specially:
Said coding redundancy version is carried on all data RE that the OFDM symbol of all Resource Unit RE and the said descending conventional subframe of the transmission data that the OFDM symbol chosen comprised comprised.
6. a downlink data dispensing device is characterized in that, comprising:
Choose the unit, be used for all OFDM symbols of comprising from descending special subframe DwPTS, choose and comprise in the data area all OFDM symbols at least at interior a plurality of OFDM symbols;
Load bearing unit is used for the coding redundancy version of the same downlink data of correspondence is carried on descending conventional subframe adjacent with DwPTS and the OFDM symbol of choosing unit selection;
Transmitting element is used for the control area through said descending conventional subframe, and the scheduling load bearing unit is carried on said descending conventional subframe and sends with the said coding redundancy version of choosing in the OFDM symbol of unit selection.
7. device as claimed in claim 6 is characterized in that, the said unit of choosing specifically is used to choose all OFDM symbols that DwPTS comprises.
8. device as claimed in claim 6 is characterized in that, the said unit selection of choosing comprises at least that all OFDM symbols are specially at interior a plurality of OFDM symbols in the data area:
Said all OFDM symbols of choosing among the unit selection DwPTS except that the OFDM symbol that sends PDCCH; Or
Said all OFDM symbols of choosing among the unit selection DwPTS except that the OFDM symbol that sends PHICH; Or
Choose all OFDM symbols except that the OFDM symbol that sends PDCCH and PHICH among the DwPTS.
9. device as claimed in claim 6 is characterized in that, said load bearing unit specifically is used for:
Said coding redundancy version is carried on the data RE of the descending conventional subframe adjacent with DwPTS, the RE and data RE of transmission public reference signal CRS in the OFDM symbol chosen; Or
Said coding redundancy version is carried on the data RE of the descending conventional subframe adjacent with DwPTS, the RE and data RE of transmitting channel state information reference signals CSI-RS in the OFDM symbol chosen; Or
Said coding redundancy version is carried on the data RE of the descending conventional subframe adjacent with DwPTS, the RE and data RE of transmission CRS, CSI-RS in the OFDM symbol chosen.
10. like the arbitrary described device of claim 6～9; It is characterized in that said load bearing unit specifically is used for said coding redundancy version is carried on all data RE that the OFDM symbol of all Resource Unit RE and the said descending conventional subframe of the transmission data that the OFDM symbol chosen comprised is comprised.
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| CN201010616074XA CN102571662A (en) | 2010-12-30 | 2010-12-30 | Transmitting method and device for downlink data |
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| CN201010616074XA CN102571662A (en) | 2010-12-30 | 2010-12-30 | Transmitting method and device for downlink data |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101547518A (en) * | 2008-03-25 | 2009-09-30 | 三星电子株式会社 | Equipment and method for allocating distributed channel |
| CN101567766A (en) * | 2008-04-25 | 2009-10-28 | 大唐移动通信设备有限公司 | Transmission method for confirming feedback information |
| CN101567775A (en) * | 2008-04-25 | 2009-10-28 | 大唐移动通信设备有限公司 | Method for transmitting uplink data, sending end device and receiving end device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101547518A (en) * | 2008-03-25 | 2009-09-30 | 三星电子株式会社 | Equipment and method for allocating distributed channel |
| CN101567766A (en) * | 2008-04-25 | 2009-10-28 | 大唐移动通信设备有限公司 | Transmission method for confirming feedback information |
| CN101567775A (en) * | 2008-04-25 | 2009-10-28 | 大唐移动通信设备有限公司 | Method for transmitting uplink data, sending end device and receiving end device |
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Application publication date: 20120711 |