CN102196570B - Data transmission method, system and device - Google Patents

Abstract

The invention discloses a data transmission method, a data transmission system and a data transmission device, which relate to the field of wireless communication, and are used for enhancing the reliability of data transmission and saving air interface resources. In the invention, a base station allocates a physical resource block (PRB) to a terminal according to the current to-be-transmitted data volume and the target spectral efficiency required to be achieved by data transmission, then the PRB is taken as a first PRB; an added PRB is allocated to the terminal, and the added allocated PRB is taken as a second PRB; and downlink data corresponding to the data volume is transmitted to the terminal by using the first PRB and the second PRB, or the terminal is indicated to transmit uplink data corresponding to the data volume to the data station by using the first PRB and the second PRB. By using the method, system and device disclosed by the invention, the reliability of data transmission can be enhanced effectively, the retransmission probability of HARQ (hybrid automatic repeat requests) can be reduced, and the waste of air interface resources can be reduced effectively.

Description

Data transmission method, system and equipment

Technical field

The present invention relates to wireless communication field, relate in particular to a kind of data transmission method, system and equipment.

Background technology

In Long Term Evolution (LTE) system, physical radio resource piece (PRB) is basic resource allocation unit, is used for carrying out the resource distribution of Physical Downlink Shared Channel (PDSCH) and Physical Uplink Shared Channel (PUSCH).A PRB is defined as the N of time domain _symb ^uLn by individual continuous OFDM (OFDM) symbol and frequency domain _sc ^rBindividual continuous subcarrier.Descending N in LTE system _symb ^uLand N _sc ^rBvalue by table 1, provided.As shown in Table 1, under conventional CP, a conventional PRB comprises 84 Resource Units (RE), a conventional PRB comprises 168 RE to (PRB Pair).Wherein, the example that PRB and PRB are right as shown in Figure 1.

Table 1

While determining descending transmission block size (TBS) according to LTE agreement, suppose under conventional CP, control area takies under the pilot-frequency expense condition of 3 OFDM symbols (being CFI=3), 2 antenna ports, each conventional PRB is to comprising 120 RE that can be used for business data transmission.While determining up transmission block size (TBS), consider under conventional CP, 2 OFDM symbols are for transmitting uplink demodulation reference symbol (DMRS), each conventional PRB is to comprising 144 RE that can be used for business data transmission.

According to LTE system descending resource mapping rule, the PRB transmitting for PDSCH is to being perforated, with transmission downlink physical broadcast channel (PBCH), primary synchronization channel (PSCH), auxiliary synchronization channel (SSCH), by the PRB being perforated to being called punching PRB couple.In addition; for time-division Long Term Evolution (TD-LTE) system; because part RE is perforated for the transmission of protection interval time slot (GP), uplink special time slot (UpPTS) and PSCH, the OFDM symbolic number that descending special time slot (DwPTS) takies is less than conventional PRB couple.According to ascending resource mapping ruler, when UCI and business datum are carried on PUSCH channel simultaneously, for the PRB that transmits PUSCH to being perforated for transmitting UCI.Particularly, there are six right use-cases of punching PRB, as shown in table 2.

Table 2

Use-case numbering	Use-case content	Remarks
			Case1	For frame structure 1 and frame structure 2,6 PRB in the middle of the bandwidth of subframe 0, part OFDM symbol is perforated for PBCH and SCH transmission (frame structure 1 comprises PSCH and SSCH, and frame structure 2 comprises SSCH)	Descending
Case2	For all PRB of DwPTS in frame structure 2, part running time-frequency resource is perforated for GP, UpPTS and transmits	Descending
			Case3	For frame structure 1 and frame structure 2,6 PRB in the middle of the bandwidth of subframe 5, part OFDM symbol is perforated for SSCH and transmits	Descending
Case4	For 6 PRB in the middle of the bandwidth of frame structure 2, subframe 1 and subframe 6, an OFDM symbol is perforated for PSCH and transmits	Descending
			Case5	All PRB of the sub-frame of uplink being configured for SRS, an OFDM symbol is reserved for SRS and transmits	Up
Case6	When UCI and business datum are carried on PUSCH channel simultaneously, part RE resource will be reserved to transmit UCI (ACK/NACK, CQI/PMI and RI)	Up

Wherein, Fig. 2 and Fig. 3 have provided respectively conventional CP, the Case1/3/4 of TD-LTE system and the schematic diagram of Case6.

In LTE system, definite scheme of up-downgoing resource allocation parameters belongs to equipment problem of implementation, and LTE agreement is not done unified regulation.Scheme descending and up employing is basic identical, at present a kind of common really fix row resource allocation parameters scheme as shown in Figure 4:

Step 1: determined PRB number and the position of distributing to terminal (UE) by downlink resource distribution module.In the process of distributing in resource, first according to the PRB number of the current transfer of data demand of UE and broad-band channel quality indication (CQI) (being the Signal to Interference plus Noise Ratio (SINR) of full bandwidth) estimation distribution, then according to subband CQI, further determine number and the position of distributing PRB.

Step 2: descending AMC module is selected modulation coding mode (MCS) grade according to the locational time domain SINR of PRB distributing for UE.What during base station selected MCS grade, use is that the CQI reporting according to UE has carried out the SINR on each PRB revising.

Step 3: obtain MCS sign (MCS index) by MCS selector, according to the mapping relations of MCS index and transmission block size sign (TBS index), table look-up and obtain TBS index.The mapping form of descending MCS index and TBS index is referring to table 3.

Step 4: by the PRB number N_PRB of TBS index and CU, according to the mapping relations of (TBS index, N_PRB) and TBS, obtain the size of TBS by searching TBS form.Wherein, TBS form is referring to table 4.

Table 3

Table 4

Being described as follows of his-and-hers watches 4: TBS form one has 27 row, 110 row, a kind of TBS call number of each line display I _tBS(value from 0 to 26, corresponding to 29 kinds of MCS grades in table 3), the PRB number N of distribution is shown in each list _pRB(for the system bandwidth of 20MHz, from 1 to 110).For for simplicity, table 4 has provided N _pRBfrom 1 to 10 situation.

LTE agreement 36.213 regulations: for the special subframe configuration 0 and 5 of conventional CP, and special subframe configuration 0 and 4, the DwPTS of expansion CP can not transmit data.In other situation, DwPTS can transmitting downlink data.

When DwPTS transmission downlink service data, the processing method of terminal (UE) side is as follows:

Step 1:UE reads the MCS signaling I of 5 bits from DCI signaling _mCS;

Step 2:UE distributes indication to obtain current operable PRB number n ' by resource _pRB;

Step 3:UE calculates the PRB number N for searching TBS form _pRB:

Step 4: according to MCS form (being form 3), pass through I _mCSobtain I _tBS, then according to TBS form (being form 4) and (I _tBS, N _pRB) to the mapping relations of TBS, determine TBS.

In realizing process of the present invention, inventor finds to exist in prior art following technical problem:

In six use-case situations shown in table 2, the RE number that can be used for business data transmission, causes the actual bit rate of business datum to improve, thereby has reduced the detection performance of UE to this business datum greatly reducing with respect to conventional PRB, wasted interface-free resources, made a concrete analysis of as follows:

Current LTE agreement regulation, base station (eNodeB) when determining the TBS of business datum, be all according to conventional PRB to designing, consider punching PRB on impact.The Case1 of take below in table 2 describes as example: suppose a conventional PRB to the available RE number comprising as the available RE number that 120, one punching PRB centerings comprise be 62, so, distributing two PRB to (N _pRB=2) under condition, punch PRB pair with the right spectrum efficiency of conventional PRB and code check referring to table 5.As shown in Table 5: two PRB that distribute when eNodeB scheduler to be all punching PRB to time (above-mentioned situation in 1.4M bandwidth, subframe 0 time be bound to occur), under 17 kinds of MCS grades, actual bit rate is all greater than 0.93, even be greater than 1, UE even makes a mistake to the detection hydraulic performance decline of business datum, the reliability of business data transmission is reduced, and the HARQ causing while making a mistake retransmits has wasted interface-free resources greatly.

Table 5

I TBS	TBS (N PRB＝2)	Q m	The right spectrum efficiency (2*120REs) of conventional PRB	The right code check (2*120REs) of conventional PRB	The right spectrum efficiency (2*62REs) of punching PRB	The right code check (2*62REs) of punching PRB
							0	32	2	0.2333	0.1167	0.4516	0.2258
1	56	2	0.3333	0.1667	0.6452	0.3226
							2	72	2	0.4000	0.2000	0.7742	0.3871
3	104	2	0.5333	0.2667	1.0323	0.5161
							4	120	2	0.6000	0.3000	1.1613	0.5806
5	144	2	0.7000	0.3500	1.3548	0.6774
							6	176	2	0.8333	0.4167	1.6129	0.8065
7	224	2	1.0333	0.5167	2.0000	1.0000
							8	256	2	1.1667	0.5833	2.2581	1.1290
9	296	2	1.3333	0.6667	2.5806	1.2903
							10	328	4	1.4667	0.3667	2.8387	0.7097

11	376	4	1.6667	0.4167	3.2258	0.8065
							12	440	4	1.9333	0.4833	3.7419	0.9355
13	488	4	2.1333	0.5333	4.1290	1.0323
							14	552	4	2.4000	0.6000	4.6452	1.1613
15	600	4	2.6000	0.6500	5.0323	1.2581
							16	632	6	2.7333	0.4556	5.2903	0.8817
17	696	6	3.0000	0.5000	5.8065	0.9677
							18	776	6	3.3333	0.5556	6.4516	1.0753
19	840	6	3.6000	0.6000	6.9677	1.1613
							20	904	6	3.8667	0.6444	7.4839	1.2473
21	1000	6	4.2667	0.7111	8.2581	1.3763
							22	1064	6	4.5333	0.7556	8.7742	1.4624
23	1128	6	4.8000	0.8000	9.2903	1.5484
							24	1192	6	5.0667	0.8444	9.8065	1.6344
25	1256	6	5.3333	0.8889	10.3226	1.7204
							26	1480	6	6.2667	1.0444	12.1290	2.0215

Summary of the invention

The embodiment of the present invention provides a kind of data transmission method, system and equipment, for improving the reliability of transfer of data, saves interface-free resources.

A data transmission method, the method comprises:

The target spectrum efficiency that base station need reach according to current data volume waiting for transmission and transfer of data, is terminal distribution Physical Resource Block PRB, using the PRB distributing as a PRB;

Base station is defined as according to following formula one or formula two the number N that terminal increases the PRB distributing _add: formula one:

formula two:

wherein, λ ₁represent to punch in PRB that base station is terminal distribution PRB to the number of the Resource Unit RE comprising and conventional PRB the ratio to the number of the RE comprising; λ ₂the PRB pair of ratio with the right total number of a PRB represents to punch in a PRB that base station is terminal distribution; K is predefined for representing the ratio of spectrum efficiency and the target spectrum efficiency of the actual use of physical channel, and the span of K is: 0 < K < 1; N _{pRB, all_normal}total number for the base station PRB that is terminal distribution; Base station is according to definite N _addfor increasing, terminal distributes PRB; Using the PRB that increases distribution as the 2nd PRB;

Base station utilizes a PRB and the 2nd PRB to downlink data corresponding to data volume described in terminal transmission; Or indicating terminal utilizes a PRB and the 2nd PRB to upstream data corresponding to data volume described in base-station transmission.

A wireless communication system, this system comprises:

Base station, for the target spectrum efficiency that need reach according to current data volume waiting for transmission and transfer of data, is terminal distribution Physical Resource Block PRB, using the PRB distributing as a PRB; According to following formula one or formula two, be defined as the number N that terminal increases the PRB distributing _add: formula one:

formula two:

wherein, λ ₁represent to punch in PRB that base station is terminal distribution PRB to the number of the Resource Unit RE comprising and conventional PRB the ratio to the number of the RE comprising; λ ₂the PRB pair of ratio with the right total number of PRB represents to punch in a PRB that base station is terminal distribution; K is predefined for representing the ratio of spectrum efficiency and the target spectrum efficiency of the actual use of physical channel, and the span of K is: 0 < K < 1; N _{pRB, all_normal}total number for the base station PRB that is terminal distribution; According to definite N _addfor increasing, terminal distributes PRB; Using the PRB that increases distribution as the 2nd PRB; Utilize a PRB and the 2nd PRB to downlink data corresponding to data volume described in terminal transmission; Or indicating terminal utilizes a PRB and the 2nd PRB to upstream data corresponding to data volume described in base-station transmission;

Terminal, for receiving described downlink data; Or, according to the indication of base station, utilize a PRB and the 2nd PRB to upstream data corresponding to data volume described in base-station transmission.

A base station, this base station comprises:

The one PRB allocation units, the 2nd PRB allocation units and transmission indicating member;

Described PRB allocation units, for the target spectrum efficiency that need reach according to current data volume waiting for transmission and transfer of data, are terminal distribution Physical Resource Block PRB, using the PRB distributing as a PRB;

Described the 2nd PRB allocation units comprise number determining unit and allocation units;

Described number determining unit, for being defined as the number N of the PRB of terminal increase distribution according to following formula one or formula two _add: formula one:

formula two:

wherein, λ ₁represent to punch in PRB that base station is terminal distribution PRB to the number of the Resource Unit RE comprising and conventional PRB the ratio to the number of the RE comprising; λ ₂the PRB pair of ratio with the right total number of PRB represents to punch in a PRB that base station is terminal distribution; K is predefined for representing the coefficient of the spectrum efficiency of the actual use of physical channel and the ratio of target spectrum efficiency, and the span of K is: 0 < K < 1; N _{pRB, all_normal}total number for the base station PRB that is terminal distribution;

Described allocation units, for according to definite N _addfor increasing, terminal distributes PRB, using the PRB that increases distribution as the 2nd PRB;

Described transmission indicating member, for utilizing a PRB and the 2nd PRB to downlink data corresponding to data volume described in terminal transmission; Or indicating terminal utilizes a PRB and the 2nd PRB to upstream data corresponding to data volume described in base-station transmission.

In the present invention, after the target spectrum efficiency that base station need to reach according to current data volume waiting for transmission and transfer of data is terminal distribution PRB, for terminal increase to be distributed PRB, and utilize all PRB that all PRB of distributing distribute to downlink data corresponding to this data volume of terminal transmission or indicating terminal utilization to upstream data corresponding to this data volume of base-station transmission.Visible, in the present invention owing to having distributed PRB for terminal increase, the utilizable resource of downlink data transmission or transmitting uplink data is increased, the actual spectrum efficiency reaching just reduces during transfer of data so, the also corresponding reduction of code check adopting, and then improved the reliability of transfer of data, and reduced the probability that HARQ retransmits, effectively reduced the waste to interface-free resources.

accompanying drawing explanation

Fig. 1 is the right schematic diagram of PRB in prior art;

Fig. 2 is the right schematic diagram of PRB that punches under TD-LTE system convention CP in prior art;

Fig. 3 is another punching PRB right schematic diagram under TD-LTE system convention CP in prior art;

Fig. 4 is the definite schematic flow sheet of LTE system descending TBS in prior art;

The method flow schematic diagram that Fig. 5 provides for the embodiment of the present invention;

Fig. 6 A is the realization flow schematic diagram of the embodiment of the present invention;

Fig. 6 B calculates deadlock schematic diagram in the embodiment of the present invention;

Fig. 6 C is calculation of parameter schematic diagram in the embodiment of the present invention;

Fig. 6 D is that in the embodiment of the present invention, another calculates deadlock schematic diagram;

Fig. 6 E is another calculation of parameter schematic diagram in the embodiment of the present invention;

The system configuration schematic diagram that Fig. 7 provides for the embodiment of the present invention;

The architecture of base station schematic diagram that Fig. 8 provides for the embodiment of the present invention.

Embodiment

In order to improve reliability, the saving interface-free resources of transfer of data, the embodiment of the present invention provides a kind of data transmission method, in this method, the code check using when the number of the PRB utilizing by increase transfer of data reduces downlink data transmission, to improve data transmission credibility, reduce HARQ retransmission probability, effectively avoid the waste to interface-free resources.

Referring to Fig. 5, the data transmission method that the embodiment of the present invention provides, specifically comprises the following steps:

Step 50: the target spectrum efficiency that base station need reach according to current data volume waiting for transmission and transfer of data is terminal distribution PRB, using the PRB distributing as a PRB;

Step 51: base station is that terminal increases distribution PRB, using the PRB that increases distribution as the 2nd PRB;

Step 52: base station utilizes a PRB and the 2nd PRB to downlink data corresponding to data volume described in terminal transmission; Or indicating terminal utilizes a PRB and the 2nd PRB to upstream data corresponding to data volume described in base-station transmission.

Transmission for downlink data:

The target spectrum efficiency that in step 50, transfer of data need reach, is specially the target spectrum efficiency that downlink data transmission need reach.

In step 51, base station is that terminal increases being achieved as follows of distribution PRB:

First, base station is defined as according to following formula one or formula two the number N that terminal increases the PRB distributing _add:

Formula one:

Formula two:

Wherein, λ ₁represent to punch in PRB that base station is terminal distribution PRB to the number of the RE comprising and conventional PRB the ratio to the number of the RE comprising; λ ₂represent to punch in a PRB that base station is terminal distribution PRB pair with a PRB in the ratio of the right total number of PRB; K is that predefined for example, for representing the coefficient of the ratio of the actual spectrum efficiency of using of down physical channel (PDSCH) and target spectrum efficiency, K is constant, and span is: 0 < K < 1; N _{pRB, all_normal}total number for the base station PRB that is terminal distribution;

Then, base station is according to definite N _addfor increasing, terminal distributes PRB.

Concrete, base station can be all while punching PRB increase the PRB distributing for terminal, adopts formula one to determine N _add; When the PRB that increases distribution for terminal is all conventional PRB, adopt formula two to determine N _add.

After increasing distribution PRB for terminal, the corresponding MCS grade of the spectrum efficiency of the actual use of down physical channel and total number of distributing PRB can be determined in base station, the information of total number of this MCS grade and distribution PRB is sent to terminal, with indicating terminal, according to total number of this MCS grade and distribution PRB, determine the TBS that needs reception, and according to this TBS, receive the downlink data of base station transmission.Specific as follows:

First, base station transmission need reach according to current data target spectrum efficiency and N _add, determine the spectrum efficiency of the actual use of down physical channel, the spectrum efficiency of the actual use of this down physical channel is less than described target spectrum efficiency;

Then, the MCS grade corresponding to spectrum efficiency of the actual use of down physical channel, by searching MCS form, determined in base station;

Then, base station sends to terminal by the signaling that comprises described MCS grade and the total number of PRB, and the total number of this PRB is total number of a PRB and total number sum of the 2nd PRB;

Finally, terminal, according to total number of described MCS grade and PRB, is determined the TBS that needs reception, and receives according to this TBS the downlink data that base station sends.

The spectrum efficiency of the actual use of down physical channel is determined in above-mentioned base station, can be in the following way:

In base station, according to formula one, determine N _addtime, the spectrum efficiency η of the actual use of down physical channel is determined in base station according to following formula three _used:

Formula three: ${\mathrm{\&eta;}}_{\mathrm{used}}=[{\mathrm{\&lambda;}}_1+\frac{(1-{\mathrm{\&lambda;}}_1)\&CenterDot;(1-{\mathrm{\&lambda;}}_2)}{1+{\mathrm{\&lambda;}}_3}]{\mathrm{\&eta;}}_{T\arg \mathrm{et}};$

In base station, according to formula two, determine N _addtime, the spectrum efficiency η of the actual use of down physical channel is determined in base station according to following formula four _used:

Formula four: ${\mathrm{\&eta;}}_{\mathrm{used}}=[1-\frac{(1-{\mathrm{\&lambda;}}_1)\&CenterDot;{\mathrm{\&lambda;}}_2}{1+{\mathrm{\&lambda;}}_3}]{\mathrm{\&eta;}}_{T\arg \mathrm{et}};$

In formula three and formula four,

η _targetfor described target spectrum efficiency

Transmission for upstream data:

The target spectrum efficiency that in step 50, transfer of data need reach, is specially the target spectrum efficiency that transmitting uplink data need reach.

In step 51, base station still can adopt above-mentioned formula one or formula two to be defined as terminal increases the number N that distributes PRB _add, and according to definite N _addfor increasing, terminal distributes PRB.Difference is only that the K in formula one or formula two is predefined for example, for representing the actual spectrum efficiency of using of uplink physical channel (PUSCH) and the ratio of target spectrum efficiency, K is constant, and span is: 0 < K < 1.

Concrete, base station can be all while punching PRB increase the PRB distributing for terminal, adopts formula one to determine N _add, when the PRB that increases distribution for terminal is all conventional PRB, adopt formula two to determine N _add.

In step 52, base station indicating terminal utilizes a PRB and the 2nd PRB to upstream data corresponding to data volume described in base-station transmission, and it realizes specific as follows:

First, base station transmission need reach according to current data target spectrum efficiency and N _add, determine the spectrum efficiency of the actual use of uplink physical channel, the spectrum efficiency of the actual use of this uplink physical channel is less than described target spectrum efficiency;

Then, the MCS grade corresponding to spectrum efficiency of the actual use of uplink physical channel, by searching MCS form, determined in base station;

Then, base station sends to terminal by the signaling that comprises described MCS grade and the total number of PRB, determines the TBS that needs transmission, and send upstream data according to this TBS with indicating terminal according to this MCS grade and the total number of PRB; The total number of this PRB is total number of a PRB and total number sum of the 2nd PRB.

Base station still can adopt above-mentioned formula three or formula four to determine the spectrum efficiency of the actual use of uplink physical channel.

With specific embodiment, the present invention will be described below:

LTE agreement regulation, the parameter that resource is distributed mainly comprises MCS grade, PRB number, transmission block size (TBS).No matter be up or descending, UE searches transmission block size (TBS) form by MCS grade and PRB number to obtain the current TBS that needs use.

Basic thought of the present invention is: eNodeB adjusts MCS grade and PRB number according to the PRB distributing to the right ratio of the PRB that punches in resource, UE side does not need to do independent processing, just can guarantee to have distributed partly punch PRB to the actual spectrum efficiency of using under condition and only distribute conventional PRB to remain unchanged to the spectrum efficiency under condition.

Specifically describe as follows: eNodeB is keeping transmission block size (TBS waiting for transmission _init) under constant condition, the PRB that joins of scoring is to being all that normal PRB is η to the target spectrum efficiency under condition _target, exist punching PRB to time the actual spectrum efficiency used be adjusted into η _used, and increase PRB to number, make to have distributed punching PRB to only distribute conventional PRB couple, spectrum efficiency and transmission block size under these two kinds of conditions all remain unchanged.UE side only need to be searched TBS form according to the indication of DCI signaling, without unnecessary operation, i.e. the present invention do not need LTE agreement for punching PRB to doing independent regulation.

Embodiment mono-:

The present embodiment be take downlink data transmission as example, and as shown in Figure 6A, concrete steps are as follows:

Start:

Step 61:eNodeB determines the target spectrum efficiency eta of current UE _target, descending for LTE, be the spectrum efficiency that the CQI that reported by UE determines; Up for LTE, be spectrum efficiency uplink SRS signal measurement being obtained by base station;

Step 62:eNodeB is according to η _targetwith data volume TBS waiting for transmission _initthe number of determining the PRB that needs distribution is N _{pRB, all_normal}(suppose the PRB that distributes to be all conventional PRB to);

Step 63: consider in the PRB of distribution and comprised some or all of punching PRB couple, it is η that eNodeB adjusts the actual spectrum efficiency adopting _used, and increase N _{pRB, add}(PRB distributing adds up to N to individual PRB _{pRB, used}=N _{pRB, all_normal}+ N _{pRB, add}), guarantee distribute punching PRB to only distribute conventional PRB couple, under two kinds of conditions, the spectrum efficiency of business datum and transmission block size remain unchanged.Wherein, the number (N of the PRB of increase _{pRB, add}) and the actual spectrum efficiency (η adopting _used) computational process as follows:

1) PRB continue distributing as eNodeB to all belong to punching PRB to time, order

the ratio of the actual spectrum efficiency of using of expression and target spectrum efficiency (K is constant, and span is: 0 < K < 1), and by K substitution formula

then by the y ' substitution formula of trying to achieve

obtain the η of final employing _usedcontinue with needs the right number N of punching PRB distributing _{pRB, add}(N _{pRB, add}=y ').

2) PRB continue distributing as eNodeB to all belong to conventional PRB to time, order

the ratio of the actual spectrum efficiency of using of expression and target spectrum efficiency (K is constant, and span is: 0 < K < 1), and by K substitution formula

then by the x ' substitution of trying to achieve

try to achieve the η of final employing _usedthe number N of the PRB that continuation distributes with needs _{pRB, add}(N _{pRB, add}=x ').

Wherein,

n _rEand N ' _rErepresent that respectively a conventional PRB is to the available RE number comprising with a punching PRB centering;

x and y represent respectively the N that step 62 is definite _{pRB, all_normal}the conventional PRB that individual PRB centering comprises to punching PRB right number, meet N _{pRB, all_normal}=x+y.

The PRB continue distributing as required to belong to punching PRB to or conventional PRB couple, be divided into following two kinds of situations:

1) PRB that continues distribution is to all belonging to punching PRB to (N _{pRB, add}=y ')

Note y ' expression needs to continue the right number of punching PRB of distribution, η _targetbe the target spectrum efficiency that obtains of expectation (descending for LTE, be the spectrum efficiency that the CQI that reported by UE determines; Up for LTE, be the spectrum efficiency being obtained by uplink SRS signal measurement), η _usedthe spectrum efficiency of actual use while representing to search TBS form.η _usedthe amount that need to solve, η _targetand η _usedexpression formula be shown below:

${\mathrm{\&eta;}}_{T\arg \mathrm{et}}=\frac{{\mathrm{TBS}}_{\mathrm{init}}}{x\&CenterDot;N_{\mathrm{RE}}+(y+y^{\&prime;})\&CenterDot;N_{\mathrm{RE}}^{\&prime;}}---\left(1\right)$

${\mathrm{\&eta;}}_{\mathrm{used}}=\frac{{\mathrm{TBS}}_{\mathrm{init}}}{(x+y+y^{\&prime;})\&CenterDot;N_{\mathrm{RE}}}---\left(2\right)$

By above-mentioned two formulas, can be obtained:

$\frac{{\mathrm{\&eta;}}_{T\arg \mathrm{et}}}{{\mathrm{\&eta;}}_{\mathrm{used}}}=\frac{(x+y+y^{\&prime;})\&CenterDot;N_{\mathrm{RE}}}{x\&CenterDot;N_{\mathrm{RE}}+(y+y^{\&prime;})\&CenterDot;N_{\mathrm{RE}}^{\&prime;}}=\frac{x+y+y^{\&prime;}}{x+{\mathrm{\&lambda;}}_1\&CenterDot;(y+y^{\&prime;})}---\left(3\right)$

${\mathrm{\&eta;}}_{\mathrm{used}}=[{\mathrm{\&lambda;}}_1+(1-{\mathrm{\&lambda;}}_1)\&CenterDot;\frac{\frac{x}{x+y}}{\frac{x+y}{x+y}+\frac{y^{\&prime;}}{x+y}}]{\mathrm{\&eta;}}_{T\arg \mathrm{et}}=[{\mathrm{\&lambda;}}_1+\frac{(1-{\mathrm{\&lambda;}}_1)\&CenterDot;(1-{\mathrm{\&lambda;}}_2)}{1+\frac{y^{\&prime;}}{N_{\mathrm{PRB},\mathrm{all}\_\mathrm{normal}}}}]{\mathrm{\&eta;}}_{T\arg \mathrm{et}}---\left(4\right)$

Note ${\mathrm{\&lambda;}}_3=\frac{y^{\&prime;}}{N_{\mathrm{PRB},\mathrm{all}\_\mathrm{normal}}},$ Can obtain:

${\mathrm{\&eta;}}_{\mathrm{used}}=[{\mathrm{\&lambda;}}_1+\frac{(1-{\mathrm{\&lambda;}}_1)\&CenterDot;(1-{\mathrm{\&lambda;}}_2)}{1+{\mathrm{\&lambda;}}_3}]{\mathrm{\&eta;}}_{T\arg \mathrm{et}}---\left(5\right)$

Wherein, the span of y ' is 1≤y '≤(N _{pRB, all_Punc}-y), N _{pRB, all_Punc}represent whole right numbers of punching PRB.

With η _usedas known quantity, the computing formula of y ' is:

Wherein,

represent to round up operation.

From formula (4) and (5): spectrum efficiency η _usedthe amount that need to solve, in order to solve η _usedneed known parameters λ ₃(λ ₃by y ' and N _{pRB, all_normal}ratio determine), and y ' is unknown, depends on that eNodeB continues the right number of punching PRB of distributing.Therefore there is a Deadlock, as shown in Figure 6B.

For fear of above-mentioned Deadlock, order

represent the actual spectrum efficiency of using and the ratio of target spectrum efficiency, K is constant given in advance, and span is 0 < K < 1.By K substitution formula (6), can, in the hope of y ', then by y ' substitution formula (4), obtain the η of final employing _used, as shown in Figure 6 C.

2) PRB that continues distribution is to all belonging to conventional PRB to (N _{pRB, add}=x ')

Note x ' expression needs to continue the right number of conventional PRB of distribution, η _targetbe the target spectrum efficiency that obtains of expectation (descending for LTE, be the spectrum efficiency that the CQI that reported by UE determines; Up for LTE, be the spectrum efficiency being obtained by uplink SRS signal measurement), η _usedit is the spectrum efficiency of actual use while searching TBS form.η _targetand η _usedexpression formula be shown below:

${\mathrm{\&eta;}}_{T\arg \mathrm{et}}=\frac{{\mathrm{TBS}}_{\mathrm{init}}}{(x+x^{\&prime;})\&CenterDot;N_{\mathrm{RE}}^{\&prime;}+y\&CenterDot;N_{\mathrm{RE}}}---\left(7\right)$

${\mathrm{\&eta;}}_{\mathrm{used}}=\frac{{\mathrm{TBS}}_{\mathrm{init}}}{(x+y+x^{\&prime;})\&CenterDot;N_{\mathrm{RE}}}---\left(8\right)$

By above-mentioned two formulas, can be obtained:

$\frac{{\mathrm{\&eta;}}_{T\arg \mathrm{et}}}{{\mathrm{\&eta;}}_{\mathrm{used}}}=\frac{(x+y+x^{\&prime;})\&CenterDot;N_{\mathrm{RE}}}{(x+x^{\&prime;})\&CenterDot;N_{\mathrm{RE}}^{\&prime;}+y\&CenterDot;N_{\mathrm{RE}}}=\frac{x+y+x^{\&prime;}}{x+x^{\&prime;}+{\mathrm{\&lambda;}}_1\&CenterDot;y}---\left(9\right)$

${\mathrm{\&eta;}}_{\mathrm{used}}=[1-\frac{(1-{\mathrm{\&lambda;}}_1)\&CenterDot;y}{x+x^{\&prime;}+y}]{\mathrm{\&eta;}}_{T\arg \mathrm{et}}=[1-\&CenterDot;\frac{(1-{\mathrm{\&lambda;}}_1)\&CenterDot;\frac{x}{x+y}}{\frac{x+y}{x+y}+\frac{y^{\&prime;}}{x+y}}]{\mathrm{\&eta;}}_{T\arg \mathrm{et}}=[1-\frac{(1-{\mathrm{\&lambda;}}_1)\&CenterDot;{\mathrm{\&lambda;}}_2}{1+\frac{x^{\&prime;}}{N_{\mathrm{PRB},\mathrm{all}\_\mathrm{normal}}}}]{\mathrm{\&eta;}}_{T\arg \mathrm{et}}---\left(10\right)$

Note ${\mathrm{\&lambda;}}_3=\frac{x^{\&prime;}}{N_{\mathrm{PRB},\mathrm{all}\_\mathrm{normal}}},$ Can obtain:

${\mathrm{\&eta;}}_{\mathrm{used}}=[1-\frac{(1-{\mathrm{\&lambda;}}_1)\&CenterDot;{\mathrm{\&lambda;}}_2}{1+{\mathrm{\&lambda;}}_3}]{\mathrm{\&eta;}}_{T\arg \mathrm{et}}---\left(11\right)$

Wherein, the span of x ' is 1≤x '≤(N _{pRB, BW}-x-y), N _{pRB, BW}represent whole right numbers of PRB in whole system bandwidth,

With η _usedas known quantity, the computing formula of x ' is:

Wherein,

represent to round up operation.

From formula (10) and (11): spectrum efficiency η _usedthe amount that need to solve, in order to solve η _usedneed known parameters λ ₃(λ ₃by x ' and N _{pRB, all_normal}ratio determine), and x ' is unknown, depends on that eNodeB continues the right number of punching PRB of distributing.Therefore there is a Deadlock, shown in following Fig. 6 D.

For fear of deadlock, order

represent the actual spectrum efficiency of using and the ratio of target spectrum efficiency, K is constant, and span is 0 < K < 1, by K substitution formula (12), can, in the hope of x ', then by x ' substitution formula (10), obtain the η of final employing _used, as shown in Fig. 6 E.

In sum, determine the spectrum efficiency η of current descending PDSCH or the actual use of up PUSCH _usedfor: 1) when the PRB continue distributing to all belong to punching PRB to time,

2) when the PRB continue distributing to all belong to conventional PRB to time,

Step 64: by searching MCS form, obtain η _usedcorresponding MCS grade I _{mCS, Used}with TBS grade I _{_ TBS_used};

The PRB that step 65:eNodeB is used according to reality is to number (N _{pRB, used}=N _{pRB, all_normal}+ N _{pRB, add}) and I _{_ TBS_used}search TBS form and determine the data volume TBS of the actual employing of PDSCH _init;

Step 66:eNodeB passes through DCI signaling by N _{pRB, used}and I _{mCS, Used}send to UE;

Step 67:UE is according to the N indicating in DCI signaling _{pRB, used}and I _{mCS, Used}search MCS form and TBS form, determine the data volume TBS that needs reception _init.

Finish.

Referring to Fig. 7, the embodiment of the present invention also provides a kind of wireless communication system, and this system comprises:

Base station 70, for the target spectrum efficiency that need reach according to current data volume waiting for transmission and transfer of data, is terminal distribution Physical Resource Block PRB, using the PRB distributing as a PRB; For increasing, terminal distributes PRB, using the PRB that increases distribution as the 2nd PRB; Utilize a PRB and the 2nd PRB to downlink data corresponding to data volume described in terminal transmission; Or indicating terminal utilizes a PRB and the 2nd PRB to upstream data corresponding to data volume described in base-station transmission;

Terminal 71, for receiving described downlink data; Or, according to the indication of base station, utilize a PRB and the 2nd PRB to upstream data corresponding to data volume described in base-station transmission.

Described base station 70 for:

According to following formula one or formula two, be defined as the number N that terminal increases the PRB distributing _add:

Formula one:

Formula two:

Wherein, λ ₁represent to punch in PRB that base station is terminal distribution PRB to the number of the Resource Unit RE comprising and conventional PRB the ratio to the number of the RE comprising; λ ₂the PRB pair of ratio with the right total number of PRB represents to punch in a PRB that base station is terminal distribution; K is that predefined for representing the ratio of spectrum efficiency and the target spectrum efficiency of the actual use of physical channel, K is constant given in advance, and span is 0 < K < 1; N _{pRB, all_normal}total number for the base station PRB that is terminal distribution;

According to definite N _addfor increasing, terminal distributes PRB.

Described base station 70 also for:

According to described target spectrum efficiency and described N _add, determine the spectrum efficiency of the actual use of physical channel, the spectrum efficiency of the actual use of this physical channel is less than described target spectrum efficiency;

By searching MCS form, determine the MCS grade corresponding to spectrum efficiency of the actual use of described physical channel;

The signaling that comprises described MCS grade and the total number of PRB is sent to terminal, and the total number of described PRB is total number of a PRB and total number sum of the 2nd PRB;

Described terminal 71 for:

According to total number of described MCS grade and PRB, determine the TBS that needs reception, and receive described downlink data according to this TBS.

Described base station 70 for:

According to described target spectrum efficiency and described N _add, determine the spectrum efficiency of the actual use of physical channel, the spectrum efficiency of the actual use of this physical channel is less than described target spectrum efficiency;

By searching MCS form, determine the MCS grade corresponding to spectrum efficiency of the actual use of described physical channel;

The signaling that comprises described MCS grade and the total number of PRB is sent to terminal; The total number of described PRB is total number of a PRB and total number sum of the 2nd PRB;

Described terminal 71 for:

According to described MCS grade and the total number of PRB, determine the TBS that needs transmission, and send described upstream data according to this TBS.

Described base station 70 for:

According to described formula one, determining described N _addtime, according to the spectrum efficiency η of following formula three definite actual uses of described physical channel _used:

Formula three: ${\mathrm{\&eta;}}_{\mathrm{used}}=[{\mathrm{\&lambda;}}_1+\frac{(1-{\mathrm{\&lambda;}}_1)\&CenterDot;(1-{\mathrm{\&lambda;}}_2)}{1+{\mathrm{\&lambda;}}_3}]{\mathrm{\&eta;}}_{T\arg \mathrm{et}};$

According to described formula two, determining described N _addtime, according to the spectrum efficiency η of following formula four definite actual uses of described physical channel _used:

Formula four: ${\mathrm{\&eta;}}_{\mathrm{used}}=[1-\frac{(1-{\mathrm{\&lambda;}}_1)\&CenterDot;{\mathrm{\&lambda;}}_2}{1+{\mathrm{\&lambda;}}_3}]{\mathrm{\&eta;}}_{T\arg \mathrm{et}};$

Wherein, ${\mathrm{\&lambda;}}_3=\frac{N_{\mathrm{add}}}{N_{\mathrm{PRB},\mathrm{all}\_\mathrm{normal}}},$ η _targetfor described target spectrum efficiency.

Referring to Fig. 8, the embodiment of the present invention also provides a kind of base station, and this base station comprises:

The one PRB allocation units 80, for the target spectrum efficiency that need reach according to current data volume waiting for transmission and transfer of data, are terminal distribution Physical Resource Block PRB, using the PRB distributing as a PRB;

The 2nd PRB allocation units 81, are used to terminal to increase and distribute PRB, using the PRB that increases distribution as the 2nd PRB;

Transmission indicating member 82, for utilizing a PRB and the 2nd PRB to downlink data corresponding to data volume described in terminal transmission; Or indicating terminal utilizes a PRB and the 2nd PRB to upstream data corresponding to data volume described in base-station transmission.

The 2nd PRB allocation units 81 comprise:

Number determining unit, for being defined as the number N of the PRB of terminal increase distribution according to following formula one or formula two _add:

Formula one:

Formula two:

Wherein, λ ₁the PRB centering punching PRB that expression base station is terminal distribution is the ratio to the number of the RE comprising to the number of the Resource Unit RE comprising and conventional PRB; λ ₂the PRB pair of ratio with the right total number of a PRB represents to punch in a PRB that base station is terminal distribution; K is that predefined for representing the ratio of spectrum efficiency and the target spectrum efficiency of the actual use of physical channel, K is constant, and span is 0 < K < 1; N _{pRB, all_normal}total number for the base station PRB that is terminal distribution;

Allocation units, for according to definite N _addfor increasing, terminal distributes PRB.

Described base station also comprises:

Actual spectrum efficiency determining unit 83, for according to described target spectrum efficiency and described N _add, determine the spectrum efficiency of the actual use of physical channel, the spectrum efficiency of the actual use of this physical channel is less than described target spectrum efficiency;

MCS classification unit 84, for by searching MCS form, determines the MCS grade corresponding to spectrum efficiency of the actual use of described physical channel;

Signaling transmitting element 85, for the signaling that comprises described MCS grade and the total number of PRB is sent to terminal, to indicate described terminal according to total number of described MCS grade and PRB, determines the TBS that needs reception, and receives described downlink data according to this TBS; The total number of described PRB is total number of a PRB and total number sum of the 2nd PRB.

Described transmission indicating member 82 comprises:

Actual spectrum efficiency determining unit, for according to described target spectrum efficiency and described N _add, determine the spectrum efficiency of the actual use of physical channel, the spectrum efficiency of the actual use of this physical channel is less than described target spectrum efficiency;

MCS classification unit, for by searching MCS form, determines the MCS grade corresponding to spectrum efficiency of the actual use of described physical channel;

Signaling transmitting element, for the signaling that comprises described MCS grade and the total number of PRB is sent to terminal, determines according to described MCS grade and the total number of PRB the TBS that needs transmission with indicating terminal, and sends described upstream data according to this TBS; The total number of described PRB is total number of a PRB and total number sum of the 2nd PRB.

Described actual spectrum efficiency determining unit is used for:

According to described formula one, determining described N _addtime, according to the spectrum efficiency η of following formula three definite actual uses of described physical channel _used:

Formula three: ${\mathrm{\&eta;}}_{\mathrm{used}}=[{\mathrm{\&lambda;}}_1+\frac{(1-{\mathrm{\&lambda;}}_1)\&CenterDot;(1-{\mathrm{\&lambda;}}_2)}{1+{\mathrm{\&lambda;}}_3}]{\mathrm{\&eta;}}_{T\arg \mathrm{et}};$

According to described formula two, determining described N _addtime, according to the spectrum efficiency η of following formula four definite actual uses of described physical channel _used:

Formula four: ${\mathrm{\&eta;}}_{\mathrm{used}}=[1-\frac{(1-{\mathrm{\&lambda;}}_1)\&CenterDot;{\mathrm{\&lambda;}}_2}{1+{\mathrm{\&lambda;}}_3}]{\mathrm{\&eta;}}_{T\arg \mathrm{et}};$

Wherein, ${\mathrm{\&lambda;}}_3=\frac{N_{\mathrm{add}}}{N_{\mathrm{PRB},\mathrm{all}\_\mathrm{normal}}},$ η _targetfor described target spectrum efficiency.

To sum up, beneficial effect of the present invention comprises:

In the scheme that the embodiment of the present invention provides, after the target spectrum efficiency that base station need to reach according to current data volume waiting for transmission and transfer of data is terminal distribution PRB, for terminal increase to be distributed PRB, and utilize all PRB that all PRB of distributing distribute to downlink data corresponding to this data volume of terminal transmission or indicating terminal utilization to upstream data corresponding to this data volume of base-station transmission.Visible, in the present invention owing to having distributed PRB for terminal increase, the utilizable resource of downlink data transmission or transmitting uplink data is increased, the actual spectrum efficiency reaching just reduces during transfer of data so, the also corresponding reduction of code check adopting, and then improved the reliability of transfer of data, and reduced the probability that HARQ retransmits, effectively reduced the waste to interface-free resources.

Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.

Claims (12)

1. a data transmission method, is characterized in that, the method comprises:

The target spectrum efficiency that base station need reach according to current data volume waiting for transmission and transfer of data, is terminal distribution Physical Resource Block PRB, using the PRB distributing as a PRB;

Base station is defined as according to following formula one or formula two the number N that terminal increases the PRB distributing _add: formula one:

formula two:

wherein, λ ₁represent to punch in PRB that base station is terminal distribution PRB to the number of the Resource Unit RE comprising and conventional PRB the ratio to the number of the RE comprising; λ ₂the PRB pair of ratio with the right total number of a PRB represents to punch in a PRB that base station is terminal distribution; K is predefined for representing the ratio of spectrum efficiency and the target spectrum efficiency of the actual use of physical channel, and the span of K is: 0<K<1; N _{pRB, all_normal}total number for the base station PRB that is terminal distribution; Base station is according to definite N _addfor increasing, terminal distributes PRB; Using the PRB that increases distribution as the 2nd PRB;

Base station utilizes a PRB and the 2nd PRB to downlink data corresponding to data volume described in terminal transmission; Or indicating terminal utilizes a PRB and the 2nd PRB to upstream data corresponding to data volume described in base-station transmission.

2. the method for claim 1, is characterized in that, after increasing distribution PRB for terminal, the method further comprises:

Base station is according to described target spectrum efficiency and described N _add, determine the spectrum efficiency of the actual use of physical channel, the spectrum efficiency of the actual use of this physical channel is less than described target spectrum efficiency;

The MCS grade corresponding to spectrum efficiency of the actual use of described physical channel, by searching modulation coding mode MCS form, determined in base station;

Base station sends to terminal by the signaling that comprises described MCS grade and the total number of PRB, determines and needs the transmission block of reception size TBS, and receive described downlink data according to this TBS with indicating terminal according to total number of described MCS grade and PRB; The total number of described PRB is total number of a PRB and total number sum of the 2nd PRB.

3. the method for claim 1, is characterized in that, described indicating terminal utilizes a PRB and the 2nd PRB to comprise to upstream data corresponding to data volume described in base-station transmission:

Base station is according to described target spectrum efficiency and described N _add, determine the spectrum efficiency of the actual use of physical channel, the spectrum efficiency of the actual use of this physical channel is less than described target spectrum efficiency;

The MCS grade corresponding to spectrum efficiency of the actual use of described physical channel, by searching MCS form, determined in base station;

Base station sends to terminal by the signaling that comprises described MCS grade and the total number of PRB, determines the transmission block size TBS that need to send, and send described upstream data according to this TBS with indicating terminal according to described MCS grade and the total number of PRB; The total number of described PRB is total number of a PRB and total number sum of the 2nd PRB.

4. method as claimed in claim 2 or claim 3, is characterized in that, in base station, according to described formula one, determines described N _addtime, the spectrum efficiency η of the actual use of described physical channel is determined in base station according to following formula three _used:

Formula three: ${\mathrm{\&eta;}}_{\mathrm{used}}=[{\mathrm{\&lambda;}}_1+\frac{(1-{\mathrm{\&lambda;}}_1)\&CenterDot;(1-{\mathrm{\&lambda;}}_2)}{1+{\mathrm{\&lambda;}}_3}]{\mathrm{\&eta;}}_{T\arg \mathrm{et}};$

In base station, according to described formula two, determine described N _addtime, the spectrum efficiency η of the actual use of described physical channel is determined in base station according to following formula four _used:

Formula four: ${\mathrm{\&eta;}}_{\mathrm{used}}=[1-\frac{(1-{\mathrm{\&lambda;}}_1)\&CenterDot;{\mathrm{\&lambda;}}_2}{1+{\mathrm{\&lambda;}}_3}]{\mathrm{\&eta;}}_{T\arg \mathrm{et}};$

Wherein,

η _targetfor described target spectrum efficiency.

5. a wireless communication system, is characterized in that, this system comprises:

Base station, for the target spectrum efficiency that need reach according to current data volume waiting for transmission and transfer of data, is terminal distribution Physical Resource Block PRB, using the PRB distributing as a PRB; According to following formula one or formula two, be defined as the number N that terminal increases the PRB distributing _add: formula one: formula two:

wherein, λ ₁represent to punch in PRB that base station is terminal distribution PRB to the number of the Resource Unit RE comprising and conventional PRB the ratio to the number of the RE comprising; λ ₂the PRB pair of ratio with the right total number of PRB represents to punch in a PRB that base station is terminal distribution; K is predefined for representing the ratio of spectrum efficiency and the target spectrum efficiency of the actual use of physical channel, and the span of K is: 0<K<1; N _{pRB, all_normal}total number for the base station PRB that is terminal distribution; According to definite Nadd, be that terminal increases distribution PRB; Using the PRB that increases distribution as the 2nd PRB; Utilize a PRB and the 2nd PRB to utilize a PRB and the 2nd PRB to upstream data corresponding to data volume described in base-station transmission to downlink data corresponding to data volume described in terminal transmission or indicating terminal;

Terminal, for receiving described downlink data, or utilizes a PRB and the 2nd PRB to upstream data corresponding to data volume described in base-station transmission according to the indication of base station.

6. system as claimed in claim 5, is characterized in that, described base station also for:

According to described target spectrum efficiency and described N _add, determine the spectrum efficiency of the actual use of physical channel, the spectrum efficiency of the actual use of this physical channel is less than described target spectrum efficiency;

By searching MCS form, determine the MCS grade corresponding to spectrum efficiency of the actual use of described physical channel;

The signaling that comprises described MCS grade and the total number of PRB is sent to terminal, and the total number of described PRB is total number of a PRB and total number sum of the 2nd PRB;

Described terminal is used for:

According to total number of described MCS grade and PRB, determine and need the transmission block of reception size TBS, and receive described downlink data according to this TBS.

7. system as claimed in claim 5, is characterized in that, described base station is used for:

According to described target spectrum efficiency and described N _add, determine the spectrum efficiency of the actual use of physical channel, the spectrum efficiency of the actual use of this physical channel is less than described target spectrum efficiency;

By searching MCS form, determine the MCS grade corresponding to spectrum efficiency of the actual use of described physical channel;

The signaling that comprises described MCS grade and the total number of PRB is sent to terminal; The total number of described PRB is total number of a PRB and total number sum of the 2nd PRB;

Described terminal is used for:

According to described MCS grade and the total number of PRB, determine the transmission block size TBS that need to send, and send described upstream data according to this TBS.

8. the system as described in claim 6 or 7, is characterized in that, described base station is used for:

According to described formula one, determining described N _addtime, according to the spectrum efficiency η of following formula three definite actual uses of described physical channel _used:

Formula three: ${\mathrm{\&eta;}}_{\mathrm{used}}=[{\mathrm{\&lambda;}}_1+\frac{(1-{\mathrm{\&lambda;}}_1)\&CenterDot;(1-{\mathrm{\&lambda;}}_2)}{1+{\mathrm{\&lambda;}}_3}]{\mathrm{\&eta;}}_{T\arg \mathrm{et}};$

According to described formula two, determining described N _addtime, according to the spectrum efficiency η of following formula four definite actual uses of described physical channel _used:

Formula four: ${\mathrm{\&eta;}}_{\mathrm{used}}=[1-\frac{(1-{\mathrm{\&lambda;}}_1)\&CenterDot;{\mathrm{\&lambda;}}_2}{1+{\mathrm{\&lambda;}}_3}]{\mathrm{\&eta;}}_{T\arg \mathrm{et}};$

Wherein,

η _targetfor described target spectrum efficiency.

9. a base station, is characterized in that, this base station comprises:

The one PRB allocation units, the 2nd PRB allocation units and transmission indicating member;

Described PRB allocation units, for the target spectrum efficiency that need reach according to current data volume waiting for transmission and transfer of data, are terminal distribution Physical Resource Block PRB, using the PRB distributing as a PRB;

Described the 2nd PRB allocation units comprise number determining unit and allocation units;

Described number determining unit, for being defined as the number N of the PRB of terminal increase distribution according to following formula one or formula two _add: formula one:

formula two:

wherein, λ ₁represent to punch in PRB that base station is terminal distribution PRB to the number of the Resource Unit RE comprising and conventional PRB the ratio to the number of the RE comprising; λ ₂the PRB pair of ratio with the right total number of PRB represents to punch in a PRB that base station is terminal distribution; K is predefined for representing the coefficient of the spectrum efficiency of the actual use of physical channel and the ratio of target spectrum efficiency, and the span of K is: 0<K<1; N _{pRB, all_normal}total number for the base station PRB that is terminal distribution;

Described allocation units, for according to definite N _addfor increasing, terminal distributes PRB, using the PRB that increases distribution as the 2nd PRB;

Described transmission indicating member, for utilizing a PRB and the 2nd PRB to downlink data corresponding to data volume described in terminal transmission; Or indicating terminal utilizes a PRB and the 2nd PRB to upstream data corresponding to data volume described in base-station transmission.

10. base station as claimed in claim 9, is characterized in that, described base station also comprises:

Actual spectrum efficiency determining unit, for according to described target spectrum efficiency and described N _add, determine the spectrum efficiency of the actual use of physical channel, the spectrum efficiency of the actual use of this physical channel is less than described target spectrum efficiency;

MCS classification unit, for by searching MCS form, determines the MCS grade corresponding to spectrum efficiency of the actual use of described physical channel;

Signaling transmitting element, for the signaling that comprises described MCS grade and the total number of PRB is sent to terminal, to indicate described terminal according to total number of described MCS grade and PRB, determine and need the transmission block of reception size TBS, and receive described downlink data according to this TBS; The total number of described PRB is total number of a PRB and total number sum of the 2nd PRB.

11. base stations as claimed in claim 9, is characterized in that, described transmission indicating member comprises:

Actual spectrum efficiency determining unit, for according to described target spectrum efficiency and described N _add, determine the spectrum efficiency of the actual use of physical channel, the spectrum efficiency of the actual use of this physical channel is less than described target spectrum efficiency;

MCS classification unit, for by searching MCS form, determines the MCS grade corresponding to spectrum efficiency of the actual use of described physical channel;

Signaling transmitting element, for the signaling that comprises described MCS grade and the total number of PRB is sent to terminal, determines the transmission block size TBS that need to send with indicating terminal according to described MCS grade and the total number of PRB, and sends described upstream data according to this TBS; The total number of described PRB is total number of a PRB and total number sum of the 2nd PRB.

12. base stations as described in claim 10 or 11, is characterized in that, described actual spectrum efficiency determining unit is used for:

According to described formula one, determining described N _addtime, according to the spectrum efficiency η of following formula three definite actual uses of described physical channel _used:

Formula three: ${\mathrm{\&eta;}}_{\mathrm{used}}=[{\mathrm{\&lambda;}}_1+\frac{(1-{\mathrm{\&lambda;}}_1)\&CenterDot;(1-{\mathrm{\&lambda;}}_2)}{1+{\mathrm{\&lambda;}}_3}]{\mathrm{\&eta;}}_{T\arg \mathrm{et}};$

According to described formula two, determining described N _addtime, according to the spectrum efficiency η of following formula four definite actual uses of described physical channel _used:

Formula four: ${\mathrm{\&eta;}}_{\mathrm{used}}=[1-\frac{(1-{\mathrm{\&lambda;}}_1)\&CenterDot;{\mathrm{\&lambda;}}_2}{1+{\mathrm{\&lambda;}}_3}]{\mathrm{\&eta;}}_{T\arg \mathrm{et}};$

Wherein,

η _targetfor described target spectrum efficiency.

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