CN101753276B - Data frame retransmission method - Google Patents

Abstract

The invention discloses a data frame retransmission method which is used in the retransmission of special sub-frames in a division duplex system in long-termed evolution, and comprises that a network side obtains the number of resource blocks RB occupied in last time of transmission and the retransmission method of the current special sub-frames; the network side works out the number of RBs required by the retransmission according to the number of RBs occupied by the last time of transmission and the number of resources for carrying business in the RBs of the current sub-frames based on the retransmission method of the current special sub-frames; and the network side retransmits data frames according to the number of RBs required by retransmission. Compared with the prior art, the method sets up the corresponding relationship of data retransmission in RBs between the special sub-frames and conventional sub-frames, is simple and easy to be realized; in addition, because of the corresponding relationship, any data can be retransmitted in the special sub-frames or the conventional sub-frames as long as resources are still available in the retransmitted sub-frames after conversion, thereby reducing the delay of retransmission and improving the system throughput.

Description

A kind of repeating method of Frame

Technical field

The present invention relates to the communications field, relate in particular to a kind of repeating method of Frame.

Background technology

LTE TDD (Long Term Evolvement Time Duplex Division; long term evolution TDD system) in frame structure, special subframe comprises three parts; be respectively: DwPTS (Downlink PilotSlot; descending pilot frequency time slot), GP (Guard Period; protect interval) and UpPTS (Uplink PilotSlot, uplink pilot time slot).

Wherein, DwPTS can regard the transmission that conventional subframe is carried out downlink data and control signal as; UpPTS is used for transmitting RACH (Random Access Channel, Random Access Channel) and SRS (SoundingReference Signal, Sounding reference signal) etc.Suppose a RB (Resource Block, Resource Block) in, can be used for carrying PDSCH (Physical Downlink Share Channel, Physical Downlink Shared Channel) RE (Resource Element, Resource Unit) number is N, its corresponding spectrum efficiency is η, and the information of this RB carrying is N* η so.In a visible RB, can be used for transmitting the RE number of PDSCH and amount of information that this RB can carry and have close relationship.The number of symbols scope that DwPTS takies in special subframe is 3,9,10,11 and 12, in conventional CP (Cyclic Prefix, Cyclic Prefix) situation, with respect to conventional subframe, for carrying the RE number of PDSCH, has minimizing in various degree.

In existing document, special subframe new biography data are for TBsize (the TransmitBlock size of multiplexing conventional subframe, transmission block size) form, according to OFDM (the Orthogonal Frequency Division Multiplexing of the PDSCH transmission for special subframe, orthogonal frequency division multiplexi) number of symbols is multiplied by the number of the RB of special subframe data allocations again for the OFDM number of symbols ratio of PDSCH transmission divided by conventional subframe, obtain equivalent conventional subframe RB number, for the RB index of multiplexing conventional subframe TBsize form.

The supposed premise that calculates TBsize form in conventional subframe is, supposes 3 OFDM symbols that control signal takies, two antenna configurations, and conventional CP, does not consider PBCH (Physical Broadcast channel, Physical Broadcast Channel); Here be not to calculate TBsize form, but TBsize form calculate to be to be assumed to be with beared information in RB that prerequisite draws.And in RB, beared information has determined the calculating of RB number in carrying out the retransmission process relevant to special subframe.The strategy retransmitting is at present to guarantee that the TBsize retransmitting is constant, and in retransmitting so, the required RB number of how to confirm becomes the key that conventional subframe retransmits at special subframe.

The re-transmission relevant to special subframe comprises three kinds of situations: 1) conventional sub-frame data retransmits at special subframe; 2) special subframe data retransmit in conventional subframe; 3) special subframe data retransmit at special subframe.The principle of following when data re-transmission is TBsize and MCS (the Modulation and CodingScheme of data block, Modulation and Coding Scheme) remain unchanged, but the number of resources for beared information in giving the minimum unit RB of traffic resource assignment reduces at special subframe, can determine so and in the above-mentioned re-transmission situation that special subframe is relevant, retransmit the RB number that TBsize needs, by the key that becomes data and can retransmit.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of repeating method of Frame, has solved the problem of the RB number that how to confirm re-transmission TBsize needs in the relevant retransmission process of special subframe.

In order to address the above problem, the invention provides a kind of repeating method of Frame, the re-transmission situation at long term evolution TDD system special subframe, comprises,

Network side obtains the re-transmission mode of Resource Block RB number that last time, transmission took and current special subframe;

Network side is for the re-transmission mode of current special subframe, according to obtain retransmitting the RB number of needs in the RB of RB number that last time, transmission took and current subframe for the number of resources of bearer service;

Network side carries out the re-transmission of Frame according to retransmitting the RB number needing.

Furthermore, described network side obtains the step of the Resource Block RB number that transmission takies last time, comprising:

If network side judges that data retransmission is from conventional subframe, read conventional subframe retransmission information and obtain the RB number that last time, transmission took.

Furthermore, described network side obtains the step of the Resource Block RB number that transmission takies last time, comprising:

If network side judges that data retransmission is from special subframe, read special subframe retransmission information and obtain the RB number that last time, transmission took.

Furthermore, if described number of resources is Resource Unit RE number, network side is multiplied by each RB for the Resource Unit RE number of bearer service by the RB number that transmission took to last time, then divided by rounding after the numerical value obtaining for the RE number of bearer service in RB of current subframe, after calculating, obtain retransmitting the RB number needing downwards.

Furthermore, if described number of resources is orthogonal frequency division multiplexi OFDM number of symbols, network side is multiplied by each RB for the OFDM number of symbols of bearer service by the RB number that transmission took to last time, then divided by rounding after the numerical value obtaining for the OFDM number of symbols of bearer service in RB of current subframe, after calculating, obtain retransmitting the RB number needing downwards.

Furthermore, if being conventional sub-frame data, the re-transmission mode of described special subframe retransmits at special subframe, the RB number taking when network side transmits special subframe is multiplied by a RB of conventional subframe the RE number for bearer service, then divided by rounding after the numerical value obtaining for the RE number of bearer service in a RB of special subframe, after calculating, obtain the RB number that described re-transmission needs downwards.

Furthermore, if being conventional sub-frame data, the re-transmission mode of described special subframe retransmits at special subframe, the RB number taking when network side transmits special subframe is multiplied by a RB of conventional subframe the OFDM number of symbols for bearer service, then divided by rounding after the numerical value obtaining for the OFDM number of symbols of bearer service in a RB of special subframe, after calculating, obtain the RB number that described re-transmission needs downwards.

Furthermore, if being special subframe data, the re-transmission mode of described special subframe retransmits in conventional subframe, the RB number taking when network side is by the transmission of conventional subframe is multiplied by a RB of special subframe the RE number for bearer service, then divided by rounding after the numerical value obtaining for the RE number of bearer service in a RB of conventional subframe, after calculating, obtain the RB number that described re-transmission needs downwards.

Furthermore, if being special subframe data, the re-transmission mode of described special subframe retransmits in conventional subframe, the RB number taking when network side is by the transmission of conventional subframe is multiplied by a RB of special subframe the OFDM number of symbols for bearer service, then divided by rounding after the numerical value obtaining for the OFDM number of symbols of bearer service in a RB of conventional subframe, after calculating, obtain the RB number that described re-transmission needs downwards.

Furthermore, if the re-transmission mode of described special subframe is special subframe data, at special subframe, retransmit, network side obtains the RB number taking when the RB number of described re-transmission needs is special subframe transmission.

Compared with prior art, application the present invention, set up the corresponding relation of data retransmission RB between special subframe and conventional subframe, this method simply and easily realizes, in addition owing to setting up this corresponding relation, so any data retransmission is as long as still have resource to use retransmitting subframe after conversion, just can at special subframe, (new biography occurs in conventional subframe, retransmits and occurs in special subframe; New biography occurs in special subframe, retransmits and to occur in special subframe) or conventional subframe (new biography occurs in special subframe, retransmits and occurs in conventional subframe) retransmit, can reduce like this time delay of re-transmission, and improve the throughput of system.

Accompanying drawing explanation

Fig. 1 is the flow chart of the repeating method of Frame of the present invention;

Fig. 2 carries out the flow chart of the re-transmission of Frame according to RE number in example of the present invention;

Fig. 3 carries out the flow chart of the re-transmission of Frame according to OFDM number of symbols in example of the present invention.

Embodiment

Below in conjunction with the drawings and specific embodiments, the invention will be further described.

The present invention is for can the follow conventional lines thought of subframe of beared information in special subframe RB, in special subframe, make a kind of general hypothesis, control signal takies the OFDM symbol of some, two antenna configurations, conventional CP, do not consider PSS (Primary Synchronization Signal, master sync signal).Then with RE or the OFDM number of symbols of bearer service channels in re-transmission and new biography, carry out the conversion of RB number.

The repeating method of Frame of the present invention, the re-transmission situation at the descending special subframe scheduling of LTE TDD special subframe, as shown in Figure 1, comprises,

Step 100, network side read the re-transmission mode that retransmission information obtains RB number that last time, transmission took and current special subframe;

Network side obtains the RB number that last time, transmission took, and comprises following two kinds of situations,

Be wherein: if network side judges that data retransmission is from a conventional subframe, read conventional subframe retransmission information and obtain the RB number that last time, transmission took;

Another kind of situation is: if network side judges that data retransmission is from special subframe, read special subframe retransmission information and obtain the RB number that last time, transmission took.

Step 110, network side be for the re-transmission mode of current special subframe, according to obtain retransmitting the RB number of needs in the RB of RB number that last time, transmission took and current subframe for the number of resources of bearer service;

Specifically, in the RB of current subframe, the number of resources for bearer service comprises: two kinds of situations of RE number or OFDM number of symbols.When number of resources is RE number, network side is according to the re-transmission mode of current special subframe, the RB number that the last time of acquisition, transmission took is multiplied by each RB for the RE number of bearer service, then divided by rounding after the numerical value obtaining for the RE number of bearer service in RB of current subframe, after calculating, obtain retransmitting the RB number needing downwards; When number of resources is OFDM number of symbols, network side is according to the re-transmission mode of current special subframe, the RB number that the described last time obtaining, transmission took is multiplied by each RB for the OFDM number of symbols of bearer service, then divided by rounding after the numerical value obtaining for the OFDM number of symbols of bearer service in RB of current subframe, after calculating, obtain retransmitting the RB number needing downwards;

The principle that network side is equal according to beared information amount, calculates the RB number that re-transmission needs.

The RB number that step 120, network side need according to the described re-transmission obtaining carries out the re-transmission of Frame.

Below in conjunction with instantiation, the present invention is described in further detail.

1) scheme one: according to the RE number that carries PDSCH in a RB, convert, as shown in Figure 2.

Step is as follows:

Step 210: 3 OFDM symbols that conventional subframe supposition control signal takies, two antenna configurations, do not consider PBCH, conventional CP, in a RB, can be used for so PDSCH transmission RE number is N_RE_NormalSubframe; Special subframe, control signal takies 2 OFDM symbols, and two antenna configurations are not considered PSS, and conventional CP calculates in a RB and can be used for PDSCH transmission RE number, and the OFDM symbol that DwPTS takies is different, need to calculate respectively, counts N_RE_SpecialSubframe;

Step 220: judge that data retransmission is from conventional subframe or special subframe, read retransmission information and obtain the RB number that last time, transmission took, be designated as N_RB;

Step 230: judging current is which kind of re-transmission mode of special subframe, if data retransmission retransmits at special subframe from conventional subframe, performs step 240; If data retransmission retransmits in conventional subframe from special subframe, perform step 250; If data retransmission retransmits at special subframe from special subframe, perform step 260;

Step 240: if data retransmission retransmits at special subframe from conventional subframe, RB number N _ the RB_Retransmit retransmit needing so equals conventional subframe, and for the RE number N _ RE_NormalSubframe of PDSCH business transmission and special subframe, the ratio for RE number N _ RE_SpecialSubframe of transmitting PDSCH business and transmitting rounds downwards, be multiplied by again RB number N _ RB that it takies when special subframe transmits, $N\_\mathrm{RB}\_\mathrm{Retransmit}=\mathrm{floor}(\frac{N\_\mathrm{RE}\_\mathrm{NormalSubframe}}{N\_\mathrm{RE}\_\mathrm{SpecialSubframe}}*N\_\mathrm{RB});$ Execution step 270;

Step 250: if data retransmission retransmits in conventional subframe from special subframe, RB number N _ the RB_Retransmit retransmit needing so equals special subframe, and for the RE number N _ RE_SpecialSubframe of PDSCH business transmission and conventional subframe, the ratio for RE number N _ RE_NormalSubframe of transmitting PDSCH business and transmitting rounds downwards, be multiplied by again RB number N _ RB that it takies in the time of conventional subframe transmission, $N\_\mathrm{RB}\_\mathrm{Retransmit}=\mathrm{floor}(\frac{N\_\mathrm{RE}\_\mathrm{SpecialSubframe}}{N\_\mathrm{RE}\_\mathrm{NormalSubframe}}*N\_\mathrm{RB});$ Execution step 270;

Step 260: if data retransmission retransmits at special subframe from special subframe, retransmit so the RB number N _ RB_Retransmit needing and just equal N_RB; Execution step 270;

Step 270: the RB number needing according to the described re-transmission obtaining carries out the re-transmission of Frame.

2) scheme two: according to the OFDM number of symbols that carries PDSCH in a RB, convert.As shown in Figure 3.

Step is as follows:

Step 310: carry the OFDM number of symbols of PDSCH in conventional subframe, according to 3 OFDM symbols, two antenna configurations, do not consider PBCH, the hypothesis of conventional CP, the N_OS_NormalSubframe=14-4=10 of conventional subframe equivalence.In special subframe, need the number of symbols N_OS_SpecialSubframe that different DwPTS is taken to calculate respectively;

N_OS_DwPTSHave3?OS＝3-2＝1；

N_OS_DwPTSHave9?OS＝9-3＝6；

N_OS_DwPTSHave10?OS＝10-3＝7；

N_OS_DwPTSHave11?OS＝11-3＝8；

N_OS_DwPTSHave12?OS＝12-3＝9；

Step 320: judge that data retransmission is from conventional subframe or special subframe, read retransmission information and obtain the RB number that last time, transmission took, be designated as N_RB;

Step 330: judging current is which kind of re-transmission mode of special subframe, if data retransmission retransmits at special subframe from conventional subframe, performs step 340; If data retransmission retransmits in conventional subframe from special subframe, perform step 350; If data retransmission retransmits at special subframe from special subframe, perform step 360;

Step 340: if data retransmission retransmits at special subframe from conventional subframe, RB number N _ the RB_Retransmit retransmit needing so equals conventional subframe, and for the OFDM number of symbols N_OS_NormalSubframe of PDSCH business transmission and special subframe, the ratio for the OFDM number of symbols N_OS_SpecialSubframe that transmits PDSCH business and transmit rounds downwards, be multiplied by again RB number N _ RB that it takies when special subframe transmits,

$N\_\mathrm{RB}\_\mathrm{Retransmit}=\mathrm{floor}(\frac{N\_\mathrm{OS}\_\mathrm{NormalSubframe}}{N\_\mathrm{OS}\_\mathrm{SpecialSubframe}}*N\_\mathrm{RB});$ Execution step 370;

Step 350: if data retransmission retransmits in conventional subframe from special subframe, retransmit so the RB number needing

N_RB_Retransmit equals special subframe, and for the OFDM number of symbols N_OS_SpecialSubframe of PDSCH business transmission and conventional subframe, the ratio for the OFDM number of symbols N_OS_NormalSubframe that transmits PDSCH business and transmit rounds downwards, be multiplied by again RB number N _ RB that it takies in the time of conventional subframe transmission,

$N\_\mathrm{RB}\_\mathrm{Retransmit}=\mathrm{floor}(\frac{N\_\mathrm{OS}\_\mathrm{SpecialSubframe}}{N\_\mathrm{OS}\_\mathrm{NormalSubframe}}*N\_\mathrm{RB});$ Execution step 370;

Step 360: if data retransmission retransmits at special subframe from special subframe, retransmit so the RB number N _ RB_Retransmit needing and just equal N_RB; Execution step 370;

Step 370: the RB number needing according to the described re-transmission obtaining carries out the re-transmission of Frame.

The above; be only preferably embodiment of the present invention, but protection scope of the present invention is not limited to this, any people who is familiar with this technology is in the disclosed technical scope of the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims (8)

1. a repeating method for Frame, the re-transmission situation at long term evolution TDD system special subframe, is characterized in that, comprises,

Network side obtains the re-transmission mode of Resource Block RB number that last time, transmission took and current special subframe;

Network side is for the re-transmission mode of current special subframe, according to obtain retransmitting the RB number of needs in the RB of RB number that last time, transmission took and current subframe for the number of resources of bearer service;

Network side carries out the re-transmission of Frame according to retransmitting the RB number needing;

Wherein, if described number of resources is Resource Unit RE number, network side is multiplied by each RB for the Resource Unit RE number of bearer service by the RB number that transmission took to last time, then divided by rounding after the numerical value obtaining for the RE number of bearer service in RB of current subframe, after calculating, obtain retransmitting the RB number needing downwards; Or

If described number of resources is orthogonal frequency division multiplexi OFDM number of symbols, network side is multiplied by each RB for the OFDM number of symbols of bearer service by the RB number that transmission took to last time, then divided by rounding after the numerical value obtaining for the OFDM number of symbols of bearer service in RB of current subframe, after calculating, obtain retransmitting the RB number needing downwards.

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

Described network side obtains the step of the Resource Block RB number that transmission takies last time, comprising:

If network side judges that data retransmission is from conventional subframe, read conventional subframe retransmission information and obtain the RB number that last time, transmission took.

3. repeating method as claimed in claim 1, is characterized in that,

Described network side obtains the step of the Resource Block RB number that transmission takies last time, comprising:

If network side judges that data retransmission is from special subframe, read special subframe retransmission information and obtain the RB number that last time, transmission took.

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

If being conventional sub-frame data, the re-transmission mode of described special subframe retransmits at special subframe, the RB number taking when network side transmits special subframe is multiplied by a RB of conventional subframe the RE number for bearer service, then divided by rounding after the numerical value obtaining for the RE number of bearer service in a RB of special subframe, after calculating, obtain the RB number that described re-transmission needs downwards.

5. repeating method as claimed in claim 1, is characterized in that,

If being conventional sub-frame data, the re-transmission mode of described special subframe retransmits at special subframe, the RB number taking when network side transmits special subframe is multiplied by a RB of conventional subframe the OFDM number of symbols for bearer service, then divided by rounding after the numerical value obtaining for the OFDM number of symbols of bearer service in a RB of special subframe, after calculating, obtain the RB number that described re-transmission needs downwards.

6. repeating method as claimed in claim 1, is characterized in that,

If being special subframe data, the re-transmission mode of described special subframe retransmits in conventional subframe, the RB number taking when network side is by the transmission of conventional subframe is multiplied by a RB of special subframe the RE number for bearer service, then divided by rounding after the numerical value obtaining for the RE number of bearer service in a RB of conventional subframe, after calculating, obtain the RB number that described re-transmission needs downwards.

7. repeating method as claimed in claim 1, is characterized in that,

If being special subframe data, the re-transmission mode of described special subframe retransmits in conventional subframe, the RB number taking when network side is by the transmission of conventional subframe is multiplied by a RB of special subframe the OFDM number of symbols for bearer service, then divided by rounding after the numerical value obtaining for the OFDM number of symbols of bearer service in a RB of conventional subframe, after calculating, obtain the RB number that described re-transmission needs downwards.

8. repeating method as claimed in claim 1, is characterized in that,

If the re-transmission mode of described special subframe is special subframe data, at special subframe, retransmit, network side obtains the RB number taking when the RB number of described re-transmission needs is special subframe transmission.

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