CN101594216A - Sub-packet transmission method, transmitting terminal, receiving terminal and network system - Google Patents

Abstract

The invention discloses a kind of sub-packet transmission method, comprising: transmitting terminal obtains the information of expression channel situation; According to the information of the expression channel situation of being obtained, obtain transmission parameter, described transmission parameter comprises: the optimum number of retransmissions j of son bag _OptWith the sub-packet length Lsp of optimum _OptIn at least one; According to described transmission parameter, control bag sends.Use technical scheme provided by the invention, can adjust transmission parameter, guarantee the efficiency of transmission of son bag when improving throughput according to channel information.

Description

Sub-packet transmission method, transmitting terminal, receiving terminal and network system

Technical field

The present invention relates to communication technical field, particularly sub-packet transmission method, transmitting terminal, receiving terminal and network system.

Background technology

(Hybrid Automatic Repeat Request HARQ) is the most effective error-control technique that ensures reliable data transmission, and the Modern wireless communication that requires for two-forty, high quality-of-service has important function to mix retransmission protocol.

Prior art provides a kind of adaptive HARQ technology, and this adaptive HARQ technology mainly is the channel information of transmitting terminal according to the receiving terminal feedback, adaptive change modulation parameter, resource allocation parameters, re-transmission time.

In research and practice process to prior art, the inventor finds that there is following problem in prior art:

The adaptive HARQ technology that prior art provides is only considered modulation parameter, resource allocation parameters, the adjustment of re-transmission time are unfavorable for the raising of whole system throughput like this.

Summary of the invention

The technical problem that the embodiment of the invention will solve provides a kind of sub-packet transmission method, transmitting terminal, receiving terminal and network system, can adjust transmission parameter according to channel information, guarantees the efficiency of transmission of son bag when improving throughput.

In view of this, the embodiment of the invention provides:

A kind of sub-packet transmission method comprises:

Transmitting terminal obtains the information of expression channel situation;

According to the information of the expression channel situation of being obtained, obtain transmission parameter, described transmission parameter comprises: the optimum number of retransmissions j of son bag _OptWith the sub-packet length Lsp of optimum _OptIn at least one;

According to described transmission parameter, control bag sends.

A kind of sub-packet transmission method comprises:

Receiving terminal is resolved received child bag, obtains channel information;

According to described channel information, obtain transmission parameter, described transmission parameter comprises: optimum number of retransmissions j _OptWith the sub-packet length Lsp of optimum _OptIn at least one;

Send the information of the described transmission parameter of expression to transmitting terminal.

A kind of transmitting terminal comprises:

Information acquisition unit is used to obtain the information of representing channel situation;

The transmission parameter acquiring unit is used for the information according to the expression channel situation of being obtained, and obtains transmission parameter, and described transmission parameter comprises: the optimum number of retransmissions j of son bag _OptWith the sub-packet length Lsp of optimum _OptIn at least one;

Son bag transmitting element is used for according to described transmission parameter, and control bag sends.

A kind of receiving terminal comprises:

The channel information acquiring unit is used to resolve received child bag, obtains channel information;

The transmission parameter acquiring unit is used for obtaining transmission parameter according to described channel information, and described transmission parameter comprises: optimum number of retransmissions j _OptWith the sub-packet length Lsp of optimum _OptIn at least one;

Information transmitting unit is used for sending the information of representing described transmission parameter to transmitting terminal.

A kind of network system comprises transmitting terminal, receiving terminal, wherein,

Described transmitting terminal is used to obtain the information of representing channel situation; According to the information of the expression channel situation of being obtained, obtain transmission parameter, described transmission parameter comprises: the optimum number of retransmissions j of son bag _OptWith the sub-packet length Lsp of optimum _OptIn at least one; According to described transmission parameter, control bag sends to described receiving terminal;

Described receiving terminal is used to receive the child bag that described transmitting terminal sends.

A kind of network system comprises transmitting terminal, receiving terminal, wherein,

Described receiving terminal is used to resolve received child bag, obtains channel information; According to described channel information, obtain transmission parameter, described transmission parameter comprises: optimum number of retransmissions j _OptWith the sub-packet length Lsp of optimum _OptIn at least one; Send the information of the described transmission parameter of expression to transmitting terminal;

Described transmitting terminal is used for the information according to the described transmission parameter of expression, and control bag sends.

A technical scheme in the technique scheme has following beneficial effect:

The transmitting terminal of the embodiment of the invention is adjusted the optimum number of retransmissions j of son bag according to channel information _OptAnd/or optimum sub-packet length Lsp _Opt, control the transmission of son bag, can when improving throughput, guarantee the efficiency of transmission that son wraps again.

Another technical scheme in the technique scheme has following beneficial effect:

The receiving terminal of the embodiment of the invention obtains the optimum number of retransmissions j of son bag according to channel information _OptAnd/or optimum sub-packet length Lsp _Opt, will represent above-mentioned transmission parameter (j then _OptAnd/or Lsp _Opt) information send to transmitting terminal, make the transmitting terminal can be according to above-mentioned transmission parameter, the transmission of control bag guarantees the efficiency of transmission of son bag again when improving throughput.

Description of drawings

The sub-packet transmission method flow chart that Fig. 1 provides for the embodiment of the invention one;

The sub-packet transmission method flow chart that Fig. 2 provides for the embodiment of the invention two;

The sub-packet transmission method flow chart that Fig. 3 provides for the embodiment of the invention three;

The sub-packet transmission method flow chart that Fig. 4 provides for the embodiment of the invention four;

The sub-packet transmission method flow chart that Fig. 5 provides for the embodiment of the invention five;

The sending end structure schematic diagram that Fig. 6 provides for the embodiment of the invention six;

The receiving terminal structural representation that Fig. 7 provides for the embodiment of the invention seven.

Embodiment

For making the embodiment of the invention clearer, earlier the HARQ system is simply introduced.The HARQ system comprises three parts: transmitting terminal, channel and receiving terminal.Transmitting terminal obtains the transmission parameter of son bag, and the antithetical phrase bag carries out length control, maximum retransmission control, modulation bit control and power control, then the child bag is sent in the channel.Receiving terminal receives the son bag, merges retransmitting the symbol relevant with this height bag of received symbol with previous buffer memory for the last time, if merge back son bag verification succeeds, then bundle bag output, the information relevant with this child bag of deletion institute buffer memory.

The embodiment of the invention provides a kind of sub-packet transmission method, and this method specifically comprises: transmitting terminal obtains the information of expression channel situation; According to the information of the expression channel situation of being obtained, obtain transmission parameter, described transmission parameter comprises: the optimum number of retransmissions j of son bag _OptWith the sub-packet length Lsp of optimum _OptIn at least one; According to described transmission parameter, control bag sends.Use technical method provided by the invention, can when improving throughput, guarantee the efficiency of transmission of son bag again.

Consult Fig. 1, the embodiment of the invention one provides a kind of sub-packet transmission method, and this method is set modulation bit and counted b, retransmits power P the 0th time ₀With the i time re-transmission magnitude of power P _i, sub-packet length L _SPBe definite value, ask optimum number of retransmissions j _Opt, this method comprises:

Step 101, transmitting terminal obtain accumulation signal to noise ratio γ.

Owing to considered to retransmit the influence that merges, promptly use retransmit merge after, be equivalent to the direct addition of signal to noise ratio, so after unit symbol retransmits j time, be defined as in the accumulation signal to noise ratio that retransmits under the merging:

${\mathrm{\γ}}_j=\underset{k=0}{\overset{j}{\mathrm{\Σ}}}\frac{{\left|h_k\right|}^2{P}_k}{N_0{R}_s}---\left(1\right)$

Wherein, h _kChannel response when being the k time re-transmission (the 0th re-transmission expression sends first), this channel response can be fed back by receiving terminal, also can be that the packet from receiving terminal that transmitting terminal decoding local terminal receives obtains.P _KThe power of (the 0th re-transmission expression sends first) when retransmitting for the k time for unit symbol, N ₀Be noise power spectral density.

Wherein, $\frac{{\left|h_k\right|}^2}{N_0}={\mathrm{SNR}}_k,$ SNR _KThe signal to noise ratio that retransmits for the k time.

Accordingly, unit symbol retransmits 0 time, promptly send 1 time after, the accumulation signal to noise ratio is: ${\mathrm{\γ}}_0=\frac{{\left|h_0\right|}^2{P}_0}{N_0{R}_s};$

Accordingly, unit symbol retransmits 1 time, promptly send 2 times after, the accumulation signal to noise ratio is: ${\mathrm{\γ}}_1=\underset{k=0}{\overset{1}{\mathrm{\Σ}}}\frac{{\left|h_k\right|}^2{P}_k}{N_0{R}_s};$

Step 102, transmitting terminal are set modulation bit and are counted b, retransmit power P the 0th time ₀With the i time re-transmission power P _i, sub-packet length L _SPBe definite value, wherein, P ₀=P _i=P according to accumulation signal to noise ratio r, asks maximum retransmission j pairing each T during value in preset range _SP, (usually can get j=1,2 or 3) asks described each T _SPIn maximum, obtaining the pairing j of this maximum is optimum number of retransmissions j _Opt

Suppose that the transmit frame length overall is L _Cb, becoming by N sub-package, each sub-packet length is L _Sp, wherein, the CRC check code length is L _CRC, can suppose L _CRC=16, and setting modulation bit, to count b be definite value;

Throughput is the useful information bit number that receiving terminal correctly detects in the unit interval.In order to realize system optimization, need make long-time interior average throughput bigger, rather than the throughput of single bag transmission is big.Therefore, the formula of throughput is:

The symbolic number * symbol that throughput=each symbol comprises the length ratio * per second transmission of bit number * significant bit sends chance of success.Be specially:

$T_{\mathrm{sp}}=\frac{L_{\mathrm{sp}}-L_{\mathrm{CRC}}}{L_{\mathrm{sp}}}b{R}_s\frac{\underset{k=0}{\overset{j}{\mathrm{\Σ}}}\left\{\underset{i=1}{\overset{k}{\mathrm{\Π}}}\right\{1-{[1-P_e(b,{\mathrm{\γ}}_{i-1})]}^{\frac{L_{\mathrm{sp}}}{b}}\left\}{[1-P_e(b,{\mathrm{\γ}}_k)]}^{\frac{L_{\mathrm{sp}}}{b}}\right\}}{1+\underset{k=1}{\overset{j}{\mathrm{\Σ}}}\underset{i=1}{\overset{k}{\mathrm{\Π}}}\{1-{[1-P_e(b,{\mathrm{\γ}}_{i-1})]}^{\frac{L_{\mathrm{sp}}}{b}}\}}---\left(2\right)$

Wherein, to comprise bit number be that modulation bit is counted b to every symbol; The symbolic number that per second sends is transmission rate Rs, can be normalized to 1, P _e(b, r _I-1) be the symbol error rate of the i-1 time re-transmission.

The length ratio and the symbol that calculate significant bit below send success rate:

1) length ratio of calculating significant bit

Retransmit accumulation signal to noise ratio r after j time according to unit symbol _j, obtain corresponding symbol error rate P _e(b, r _j):

$P_e(b,r_j)=2(1-2^{-\frac{b}{2}})Q\left(\sqrt{\frac{3}{2^b-1}}{r}_j\right)---\left(3\right)$

Calculating the probability that sends mistake for the first time is:

Calculating the probability that sends mistake for the second time is:

Calculating the probability that sends mistake for the third time is:

And the probability that sends mistake probability * second time of average the i time re-transmission number=transmission first time mistake * .... the probability of the i time transmission mistake.

Promptly retransmitting number the average first time is:

Retransmit number and be the average second time: $\{1-{[1-P_e(b,r_0)]}^{\frac{L_{\mathrm{sp}}}{b}}\}\×\{1-{[1-P_e(b,r_1)]}^{\frac{L_{\mathrm{sp}}}{b}}\}$

On average retransmitting number for the third time is: $\{1-{[1-P_e(b,r_0)]}^{\frac{L_{\mathrm{sp}}}{b}}\}\×\{1-{[1-P_e(b,r_1)]}^{\frac{L_{\mathrm{sp}}}{b}}\}\×\left\{{[1-P_e(b,r_2)]}^{\frac{L_{\mathrm{sp}}}{b}}\right\}$

Calculate average repeat time=average retransmit for the first time number+average retransmit for the second time number+... the average the j time re-transmission number of .., promptly

Average repeat time is added 1, obtain the average transmission number of times $1+\underset{k=1}{\overset{j}{\mathrm{\Σ}}}\underset{i=1}{\overset{k}{\mathrm{\Π}}}{\{1-[1-P_e(b,r_{i-1})]}^{\frac{L_{\mathrm{sp}}}{b}}\};$

With L _SpMultiply each other with the average transmission number of times, obtain sending total number of bits;

With L _BspDeduct L _CRC, obtain the significant bit number, the significant bit number divided by sending total number of bits, is obtained the length ratio of significant bit.

2), compute sign sends chance of success

Send failed probability with the 1st to the i-1 time and multiply each other, send probability of successful with the i time again

Multiply each other, obtain successful probability in the i time transmission; With successful probability addition in the 1st to the j+1 time transmission, obtain symbol and send chance of success:

$\underset{k=0}{\overset{j}{\mathrm{\Σ}}}\left\{\underset{i=1}{\overset{k}{\mathrm{\Π}}}\right\{1-{[1-P_e(b,r_{i-1})]}^{\frac{L_{\mathrm{sp}}}{b}}\}{[1-P_e(b,r_k)]}^{\frac{L_{\mathrm{sp}}}{b}}$

As j=1,2 or 3 the time, ask corresponding Tsp1, Tsp2, Tsp3, obtain among Tsp1, Tsp2, the Tsp3 the pairing j of maximum as the maximum retransmission j of this second son bag _Opt

Step 103, transmitting terminal are according to j _Opt, control bag sends.

Consult Fig. 2, the embodiment of the invention two provides a kind of sub-packet transmission method, and transmitting terminal is counted b, sub-packet length L with modulation bit _SPBe definite value, ask optimum number of retransmissions j _OptWith the re-transmission magnitude of power of optimum (be j _OptPairing P ₀And P _i(i from 1 to j)), this method comprises:

Step 201, transmitting terminal obtain accumulation signal to noise ratio γ.

Step 202, transmitting terminal are counted b, sub-packet length L with modulation bit _SPBe definite value, maximum retransmission j and the 0th re-transmission magnitude of power P ₀With the i time re-transmission magnitude of power P _iBe variable (wherein i from 1 to j), obtain son bag average transmitting power P _tTo j and P thereof ₀And P _iFunction; According to accumulation signal to noise ratio r, try to achieve throughput Tsp to j and P thereof ₀And P _iFunction, utilize Tsp to j and P _iFunction and son bag average transmitting power P _tTo j and P thereof ₀And P _iFunction, determine maximum retransmission j pairing re-transmission magnitude of power P during value in preset range ₀And P _i(i from 1 to j); According to j value, the pairing P of j value ₀And P _i, recomputate each Tsp, determine that the pairing j of maximum is j among each Tsp _Opt, j _OptPairing P ₀And P _i(i from 1 to j) is optimum re-transmission magnitude of power.

Wherein, son bag average transmitting power P _tFormula be:

$P_t=\frac{P_0+\underset{i=1}{\overset{j}{\mathrm{\Σ}}}{P}_i\underset{k=1}{\overset{i-1}{\mathrm{\Π}}}\{1-{[1-P_e(b,{\mathrm{\γ}}_{k-1})]}^{\frac{\mathrm{Lsp}}{b}}\}}{1+\underset{i=1}{\overset{j}{\mathrm{\Σ}}}\underset{k=1}{\overset{i-1}{\mathrm{\Π}}}\{1-{[1-P_e(b,{\mathrm{\γ}}_{k-1})]}^{\frac{\mathrm{Lsp}}{b}}\}}\≤\stackrel{\‾}{P}---\left(4\right)$

Concrete, son bag average transmitting power P _tAverage gross power/average transmission the number of times that sends of=son bag.

Wherein, the average gross power=average transmitted power for the first time+average power+average power+average the j time re-transmission power that retransmits for the second time that retransmits for the first time that sends of son bag;

Wherein, average retransmit for the i time power=the i time retransmit Power x send for the 1st time error probability * 2nd time send error probability * ... the i time transmission error probability.

In like manner, Packet Error Ratio/packet loss has been done restriction:

$P_e=1-\underset{k=0}{\overset{j}{\mathrm{\Σ}}}\left\{\underset{i=1}{\overset{k}{\mathrm{\Π}}}\right\{1-{[1-P_e(b,{\mathrm{\γ}}_{i-1})]}^{\frac{L_{\mathrm{sp}}}{b}}\left\}{[1-P_e(b,{\mathrm{\γ}}_k)]}^{\frac{L_{\mathrm{sp}}}{b}}\right\}\≤\mathrm{\ϵ}---\left(5\right)$

The sub-bag rate of mistake depends on the requirement of concrete system, and ε＜1 is a definite value here.

Under the limited situation of average power, son bag single transmitted power can be bigger than rated power.But in the real system, the single transmitted power can not be infinitely great.Therefore, the single transmitted power has been done restriction:

0＜P _i≤μP (6)

μ in the following formula＞1 is a definite value, is the ratio of maximum transmission power with respect to average transmission power.

Because each transmission power value P _iBe that an item number is indefinite, every ordered series of numbers that size is limited determines that the target function of the value of every of ordered series of numbers is (2) formula.The restrictive condition of ordered series of numbers has two: son bag average transmitting power Pt (4), limited the ordered series of numbers overall distribution; Single Power Limitation formula (6) has limited a certain distribution in the ordered series of numbers.

Because the single transmitted power is limited, average transmitting power is limited, (2) formula is the closed interval, so optimum power is united to distribute and separated existence.Lsp, j, b are under the definite value situation, and problem is converted into (j+1) individual unknown number P ₀To P _jThe associating optimal solution, its globally optimal solution solution is formula (7), and is as follows:

Order $f(P_0,P_1,P_2,...,P_j,\mathrm{\λ})=T_{\mathrm{sp}}-\mathrm{\λ}{P}_t$

$=C\·\frac{\underset{k=0}{\overset{j}{\mathrm{\Σ}}}\left\{\underset{i=1}{\overset{k}{\mathrm{\Π}}}\right\{1-{[1-P_e(b,{\mathrm{\γ}}_{i-1})]}^{\frac{L_{\mathrm{sp}}}{b}}\left\}{[1-P_e(b,{\mathrm{\γ}}_k)]}^{\frac{L_{\mathrm{sp}}}{b}}\right\}}{1+\underset{k=1}{\overset{j}{\mathrm{\Σ}}}\underset{i=1}{\overset{k}{\mathrm{\Π}}}\{1-{[1-P_e(b,{\mathrm{\γ}}_{i-1})]}^{\frac{L_{\mathrm{sp}}}{b}}\}}-\mathrm{\λ}\·\frac{P_0+\underset{i=1}{\overset{j}{\mathrm{\Σ}}}{P}_i\underset{k=1}{\overset{i-1}{\mathrm{\Π}}}\{1-{[1-P_e(b,{\mathrm{\γ}}_{k-1})]}^{\frac{\mathrm{Lsp}}{b}}\}}{1+\underset{i=1}{\overset{j}{\mathrm{\Σ}}}\underset{k=1}{\overset{i-1}{\mathrm{\Π}}}\{1-{[1-P_e(b,{\mathrm{\γ}}_{k-1})]}^{\frac{\mathrm{Lsp}}{b}}\}}$

Wherein $C=\frac{L_{\mathrm{sp}}-L_{\mathrm{CRC}}}{L_{\mathrm{sp}}}b{R}_s$ It here is definite value.

With (7) respectively to P ₀, P ₁, P ₂..., P _jAsking local derviation and making it is zero, can obtain (j+1) individual partial differential equation formula; Make that (4) formula is zero again, obtain (j+2) individual equation, associating can solve P ₀, P ₁, P ₂..., P _j, the individual unknown quantity of λ common (j+2).

If j=1 then according to globally optimal solution, can list the partial differential equation group, put in order:

$P_1=\stackrel{\‾}{P}+\frac{\stackrel{\‾}{P}-P_0}{P_e\left(P_0\right)}---\left(8\right)$

$\mathrm{\λ}=-A\frac{\∂P_e(P_0+P_1)}{\∂P_0}\·\frac{1}{\frac{\∂P_1}{\∂P_0}}---\left(9\right)$

(8), (9) formula substitution (7) formula, can cancellation P ₁, λ, be converted into the monobasic transcendental equation, utilize numerical method, promptly, can obtain P satisfying under the condition of (6) formula ₀Value.Promptly can obtain P by (8) formula again ₁Value.

If j=2 needs to distribute power P ₀, P ₁, P ₂, can adopt following method to obtain suboptimal solution:

1), make j=1, according to aforementioned manner, can solve transmission optimal power allocation P 2 times ₀, P ₁

2), make j=2, and fixing P ₀For this optimum allocation power, with P ₁, P ₂Be power to be allocated, distribute the P that can be optimized once more according to (7) formula globally optimal solution solution ₁, P ₂

If j=3 needs to distribute power P ₀, P ₁, P ₂, P ₃, the fixing P of gained during j=1 ₀, resulting P during j=2 ₁, to P ₂, P ₃Carry out optimum allocation, the P that can be optimized ₂, P ₃

Pairing P when below having obtained j=1 ₀And P ₁Pairing P during j=2 ₀, P ₁And P ₂Pairing P during j=3 ₀, P ₁, P ₂And P ₃, again according to j value, the pairing P of j value ₀And P _i(i from 1 to j) recomputates each Tsp, and then determines that the pairing j of maximum is j among each Tsp _Opt, with described j _OptCorresponding P ₀And P _iFor optimum retransmits magnitude of power.

Step 203, transmitting terminal are according to j _OptWith the pairing optimum magnitude of power that retransmits, control bag sends.

Consult Fig. 3, the embodiment of the invention three provides a kind of sub-packet transmission method, and this method adopts the mode of loop iteration, tries to achieve optimum modulation bit and counts b _Opt, optimum sub-packet length Lsp _Opt, optimum number of retransmissions j _OptAnd the re-transmission power of pairing optimum.This method comprises:

Step 301, obtain accumulation signal to noise ratio γ.

Step 302, normalization Rs=1, making maximum retransmission j, modulation bit count b is definite value, supposes that simultaneously each transmitted power is identical, i.e. P _i=P will accumulate signal to noise ratio γ and bring throughput calculation formula (2) into, to the Lsp differentiate, and utilize numerical method to obtain preferred Lsp throughput calculation formula (2).

This step specific implementation is:

(2) formula to the Lsp differentiate, is made that derivative is zero, removes negative root, obtain:

$L_{\mathrm{sp}}=\frac{L_{\mathrm{CRC}}}{2}+\frac{1}{2}\sqrt{L_{\mathrm{CRC}}^2-\frac{4L_{\mathrm{CRC}}\stackrel{\‾}{p}\left(L_{\mathrm{sp}}\right)}{{\stackrel{\‾}{p}}^{\′}\left(L_{\mathrm{sp}}\right)}}---\left(10\right)$

Wherein, $\stackrel{\‾}{p}\left(L_{\mathrm{sp}}\right)=\frac{\underset{k=0}{\overset{j}{\mathrm{\Σ}}}\left\{\underset{i=1}{\overset{k}{\mathrm{\Π}}}\right\{1-{[1-P_e(b,{\mathrm{\γ}}_{i-1})]}^{\frac{L_{\mathrm{sp}}}{b}}\left\}{[1-P_e(b,{\mathrm{\γ}}_k)]}^{\frac{L_{\mathrm{sp}}}{b}}\right\}}{1+\underset{k=1}{\overset{j}{\mathrm{\Σ}}}\underset{i=1}{\overset{k}{\mathrm{\Π}}}\{1-{[1-P_e(b,{\mathrm{\γ}}_{i-1})]}^{\frac{L_{\mathrm{sp}}}{b}}\}},$ Be average each child bag accuracy that sends.

Because p (L _Sp) also be the Lsp function, therefore when j, b are definite value, utilize numerical method can obtain the optimal value (Lsp is an integer) of Lsp.Wherein, if with p (L _Sp) to the Lsp differentiate, can get p ' (L _Sp)＜0.Therefore, by formula (10), as can be known, $L_{\mathrm{sp}}>\frac{L_{\mathrm{CRC}}}{2}+\frac{L_{\mathrm{CRC}}}{2}=L_{\mathrm{CRC}},$ So the optimal value of the Lsp that obtains is greater than L _CRCInteger.

Step 303, make that maximum retransmission j is a definite value, suppose simultaneously to retransmit magnitude of power P the i time _i=P, Lsp adopt the preferred sub-packet length Lsp that is asked in the step 302, and making modulation bit count b respectively is 2 to 8 integer, can obtain 7 throughput Tsp2 to Tsp8, asks the pairing preferred b of maximum among the Tsp2 to Tsp8.

Step 304, with j and P thereof ₀And P _iBe variable, obtain son bag average transmitting power P _tTo j and P thereof ₀And P _iFunction; Bring preferred Lsp and preferred b into throughput Tsp computing formula, utilize Tsp j and P thereof ₀And P _iFunction and son bag average transmitting power to j and P thereof ₀And P _iFunction, determine maximum retransmission j pairing re-transmission magnitude of power P during value in preset range ₀And P _i(i from 1 to j); According to j value, the pairing P of j value ₀And P _i, recomputate each Tsp, determine that the pairing j of maximum is preferred j among each Tsp, the preferred pairing P of j ₀And P _i(i from 1 to j) is the preferred magnitude of power that retransmits.

Be specially: b and Lsp adopt the resulting numerical value of step 303 and step 302 respectively, get j=1～3, according to the globally optimal solution solution that embodiment two is proposed, the P in the time of can obtaining j=1 respectively ₀, P ₁, the P during j=2 ₀, P ₁, P ₂, the P during j=3 ₀, P ₁, P ₂, P ₃According to these three groups of data, calculate its throughput Tsp1, Tsp2, Tsp3 respectively, determine that the pairing j of maximum is preferred j among the Tsp, the P corresponding with preferred j ₀And P _iBe the preferred magnitude of power that retransmits.

Step 305, the default iterations of basis are with described preferred b, preferred Lsp, preferred j and pairing P ₀And P _iCarry out interative computation according to step 302, step 303, step 304, obtain b _Opt, Lsp _Opt, j _OptAnd the re-transmission power of pairing optimum.

Concrete, suppose iterations for once, this step can for: will described preferred b, preferably j and pairing P ₀And P _iBring described throughput calculation formula into, acquisition Tsp is that 0 o'clock pairing Lsp is Lsp to the derivative of Lsp _OptWith Lsp _Opt, preferred j and pairing P ₀And P _iBring described throughput calculation formula into, making modulation bit count b respectively is 2 to 8 integer, can obtain 7 throughput Tsp2 to Tsp8, determines that the pairing b of Tsp maximum is b _OptWith Lsp _Opt, b _OptBring described throughput calculation formula into, obtain Tsp j and P _iFunction, utilize described Tsp to j and P _iFunction and son bag average transmitting power to j and P _iFunction, utilize the globally optimal solution solution, determine j _OptWith pairing P ₀And P _i

This step is that the preferred parameter that above-mentioned steps 302-step 304 obtains is carried out iteration as the initial parameter of calculating next time, number of iterations can be controlled, general iteration can obtain reasonable throughput twice, but the embodiment of the invention is not limited to iteration twice.

Step 306, transmitting terminal are according to Lsp _Opt, b _Opt, j _OptWith pairing re-transmission magnitude of power P ₀And P _i, control bag sends.

The foregoing description the one, two, the 3rd is according to accumulation signal to noise ratio γ, transmitting terminal oneself calculates transmission parameter, the embodiment of the invention also can be according to the information of the expression channel situation that prestores and the corresponding relation of transmission parameter, directly obtain the pairing transmission parameter of information of expression channel situation, send with these transmission parameter control bags.Wherein, the information of described expression channel situation can be: the sequence number in the channel feedback correspondence table, accumulation signal to noise ratio r _i, the signal to noise ratio snr that retransmits for the i time _iOr the channel response h when retransmitting for the i time _i, wherein, i is from 1 to j, and j is a maximum retransmission.Wherein, accumulation signal to noise ratio r _i, the signal to noise ratio snr that retransmits for the i time _iOr the channel response h when retransmitting for the i time _iCan be that receiving terminal feeds back, also can be that the packet from receiving terminal that transmitting terminal decoding local terminal receives obtains.Wherein, the sequence number in the channel feedback correspondence table can be that transmitting terminal obtains from receiving terminal, and the feedback correspondence table comprises: sequence number and corresponding transmission parameter (Lsp _Opt, b _Opt, j _OptWith pairing re-transmission magnitude of power P ₀And P _i) corresponding relation, transmitting terminal directly obtains the pairing Lsp of sequence number according to the described corresponding relation that prestores _Opt, b _Opt, j _OptWith pairing re-transmission magnitude of power P ₀And P _i

The following embodiment of the invention provides a kind of sub-packet transmission method, and this method specifically comprises: receiving terminal is resolved received child bag, obtains channel information; According to described channel information, obtain transmission parameter, described transmission parameter comprises: optimum number of retransmissions j _OptWith the sub-packet length Lsp of optimum _OptIn at least one; Send the information of the described transmission parameter of expression to transmitting terminal.The technical method that uses the embodiment of the invention to provide when making transmitting terminal send the son bag after receiving the feedback information of receiving terminal, can guarantee the efficiency of transmission of son bag again when improving throughput.

Consult Fig. 4, the embodiment of the invention four provides a kind of sub-packet transmission method, and receiving terminal comprises according to the transmission parameter that channel information obtained in this method: optimum number of retransmissions j _OptWith pairing optimum re-transmission magnitude of power, and then obtain optimum number of retransmissions j _OptIssue transmitting terminal with the pairing optimum sequence number of magnitude of power in the channel feedback correspondence table that retransmit, this method comprises:

Step 401, receiving terminal parse channel information according to received child bag.

Step 402, receiving terminal obtain transmission parameter according to channel information, and described transmission parameter comprises: optimum number of retransmissions j _OptRe-transmission magnitude of power P with pairing optimum ₀And P _i

This step receiving terminal is according to channel information, and the mode that transmitting terminal obtained in the mode of obtaining transmission parameter and the step 202 is identical.

Step 403, receiving terminal obtain the sequence number of transmission parameter in the channel feedback correspondence table, send described sequence number to described transmitting terminal.

Consult Fig. 5, the embodiment of the invention five provides a kind of sub-packet transmission method, and receiving terminal comprises according to the transmission parameter that channel information obtained in this method: optimal modulation bit number b _OptWith the sub-packet length Lsp of optimum _Opt, optimum number of retransmissions j _OptWith the pairing optimum magnitude of power that retransmits, and then obtain the sequence number of transmission parameter in the channel feedback correspondence table and issue transmitting terminal, this method comprises:

Step 501, receiving terminal parse channel information according to received child bag.

Step 502, receiving terminal obtain transmission parameter according to channel information, and described transmission parameter comprises: optimal modulation bit number b _OptWith the sub-packet length Lsp of optimum _Opt, optimum number of retransmissions j _OptWith the pairing optimum magnitude of power that retransmits.

This step receiving terminal is according to channel information, and the mode that transmitting terminal obtained in the mode of obtaining transmission parameter and the step 302-step 305 is identical.

Step 503, receiving terminal obtain the sequence number of transmission parameter in the channel feedback correspondence table, send described sequence number to described transmitting terminal.

The formula of symbol error rate can be different to dissimilar channels in the various embodiments described above, for example:

For the Rayleigh channel, the symbol error rate formula is:

$P_e(b,{\mathrm{\γ}}_j)=2(1-2^{-\frac{b}{2}})(1-\sqrt{\frac{3{\stackrel{\‾}{\mathrm{\γ}}}_j}{2(2^b-1)+3{\stackrel{\‾}{\mathrm{\γ}}}_j}})$

Wherein, b, γ _jIdentical in meaning and the various embodiments described above.

For the Rice channel, the symbol error rate formula is:

$P_{\mathrm{et}}={\∫}_0^{\∞}{P}_{e|{\mathrm{\β}}_s=r}{f}_{{\mathrm{\β}}_s}\left(r\right)\mathrm{dr}$

Wherein, $P_e=2(1-2^{-\frac{b}{2}})Q\left(\sqrt{\frac{3{\mathrm{\γ}}_j{\stackrel{\‾}{\mathrm{\Ω}}}_s}{(2^b-1)(1+\mathrm{\δ})}}\right),$

$f_{{\mathrm{\β}}_s}\left(r\right)=\frac{2r(1+k)}{{\stackrel{\‾}{\mathrm{\Ω}}}_s}\exp [-k-\frac{(1+k)r^2}{{\stackrel{\‾}{\mathrm{\Ω}}}_s}]\·I_0\left[2r\sqrt{\frac{k(1+k)}{{\stackrel{\‾}{\mathrm{\Ω}}}_s}}\right]$

Wherein, $\mathrm{\δ}=1-\frac{\mathrm{\α}}{4},$ α is the modulation waveform rolloff-factor, ${\stackrel{\‾}{\mathrm{\Ω}}}_s=E\left[{\mathrm{\β}}_t^2\right],$ β _tBe the influence of channel gain to the t road, k (k 〉=0) is the channel parameter of Rice, and the expression useful signal is stablized the ratio of the energy of component, is determined by fading environment.R is the signal amplitude after the normalization.

Wherein, the various embodiments described above are to calculate the accumulation signal to noise ratio according to formula (1), the pairing SNR of last son bag that can require the receiving terminal feedback to be received, and in fact, and alternative can be for following several:

1) directly feedback is accumulated signal to noise ratio γ _jThereby, the storage capacity and the operand of minimizing transmitting terminal;

2) for the embodiment of the invention one, P in (1) formula _k, P _sFor transmitting terminal, receiving terminal is known numeric value, N ₀Be statistic, can after receiving terminal records, once feed back to transmitting terminal, therefore, can only feed back as secondary channel gain h in the feedback afterwards _kCan calculate accumulation signal to noise ratio γ equally _j

Among each embodiment of the invention described above, when transmitting terminal is the base station, the base station is according to the loading condition of oneself, buffer capacity situation and SOT state of termination, location information of terminals for example, the translational speed of terminal, it is to adopt constant child bag maximum retransmission that the ability information of terminal etc. decides when this terminal sends packet, through-put power, sub-packet length, the isoparametric HARQ control mode of modulation bit number, dynamic adjustment that still adopting the various embodiments described above is provided wraps maximum retransmission, through-put power, sub-packet length, the isoparametric HARQ control mode of modulation bit number.

When transmitting terminal is terminal, terminal is according to oneself translational speed, buffer capacity, SOT state of termination, the information such as ability of positional information, terminal decide send mode, select to adopt the constant isoparametric HARQ control mode of child bag maximum retransmission, through-put power, sub-packet length, modulation bit number, dynamic adjustment that still adopting the various embodiments described above is provided wraps maximum retransmission, through-put power, sub-packet length, the isoparametric HARQ control mode of modulation bit number.

One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to finish by program, described program can be stored in a kind of computer-readable recording medium, read-only memory for example, disk or CD etc.

Consult Fig. 6, the embodiment of the invention six provides a kind of transmitting terminal, comprising:

Information acquisition unit 601 is used to obtain the information of representing channel situation;

Transmission parameter acquiring unit 602 is used for the information according to the expression channel situation of being obtained, and obtains transmission parameter, and described transmission parameter comprises: optimal modulation bit number b _Opt, optimum sub-packet length Lsp _Opt, optimum number of retransmissions j _OptAnd pairing re-transmission power;

Son bag transmitting element 603 is used for according to described transmission parameter, and control bag sends.

Wherein, described transmission parameter acquiring unit 602 is used for obtaining the pairing transmission parameter of information of described expression channel situation according to the information of the expression channel situation that prestores and the corresponding relation of transmission parameter.The information of the expression channel situation that described information acquisition unit 601 is obtained is: the sequence number in the channel feedback correspondence table, accumulation signal to noise ratio r _i, the signal to noise ratio snr that retransmits for the i time _i, the channel response h when retransmitting for the i time _i, wherein, i is from 1 to j, and j is the integer value in the default maximum retransmission scope.

Wherein, described information acquisition unit 601 is used to obtain accumulation signal to noise ratio r _i

Described transmission parameter acquiring unit 602 comprises:

The Lsp computing unit, being used to make j, b is definite value, P _iEqualing P, according to throughput Tsp computing formula, is that 0 o'clock pairing Lsp is preferred Lsp with Tsp to the derivative of Lsp, and wherein, described throughput calculation formula is:

$T_{\mathrm{sp}}=\frac{L_{\mathrm{sp}}-L_{\mathrm{CRC}}}{L_{\mathrm{sp}}}b{R}_s\frac{\underset{k=0}{\overset{j}{\mathrm{\Σ}}}\left\{\underset{i=1}{\overset{k}{\mathrm{\Π}}}\right\{1-{[1-P_e(b,{\mathrm{\γ}}_{i-1})]}^{\frac{L_{\mathrm{SP}}}{b}}\left\}{[1-P_e(b,{\mathrm{\γ}}_k)]}^{\frac{L_{\mathrm{SP}}}{b}}\right\}}{1+\underset{k=1}{\overset{j}{\mathrm{\Σ}}}\underset{i=1}{\overset{k}{\mathrm{\Π}}}\{1-{[1-P_e(b,{\mathrm{\γ}}_{i-1})]}^{\frac{L_{\mathrm{SP}}}{b}}\}}$

Wherein, L _CRCBe check code length, P _e(b, r _I-1) be the symbol error rate of the i-1 time re-transmission, R _SSymbolic number for the per second transmission; $1+\underset{k=1}{\overset{j}{\mathrm{\Σ}}}\underset{i=1}{\overset{k}{\mathrm{\Π}}}\{1-{[1-P_e(b,r_{i-1})]}^{\frac{L_{\mathrm{bs}}}{b}}\}$ Be the average transmission number of times;

The b computing unit is used for j, P _i, the resulting preferred Lsp of described Lsp computing unit brings described throughput calculation formula into, obtains the function of Tsp to b, pairing each Tsp when calculating b and in preset range, changing, asking the pairing b of maximum among described each Tsp is preferred b;

J and re-transmission power calculation unit are used for according to P _e(b, r _I-1), obtain the average gross power that sends of son bag, again divided by the average transmission number of times, obtain son bag average transmitting power to j and P _iFunction; Bring the resulting preferred Lsp of described Lsp computing unit, the resulting preferred b of described b computing unit into described throughput calculation formula, obtain Tsp j and P _iFunction, utilize described Tsp to j and P _iFunction and son bag average transmitting power to j and P _iFunction, pairing re-transmission power P when calculating j and in preset range, changing ₀And P _iAccording to j value, the pairing P of j value ₀And P _i, recomputate each Tsp, determine that the pairing j of maximum is preferred j among each Tsp, the preferred pairing P of j ₀And P _iBe the preferred power that retransmits;

The iterations control unit, be used for according to default iterations, control is with the resulting described preferred b of described b computing unit, the resulting preferred Lsp of described Lsp computing unit, described j and retransmit the resulting described preferred j of power calculation unit and pairing preferred re-transmission power is imported described Lsp computing unit and carried out interative computation.

Consult Fig. 7, the embodiment of the invention seven provides a kind of receiving terminal, comprising:

Channel information acquiring unit 701 is used to resolve received child bag, obtains channel information;

Transmission parameter acquiring unit 702 is used for obtaining transmission parameter according to described channel information, and described transmission parameter comprises: j _OptAnd pairing re-transmission magnitude of power P _Iopt, b _OptAnd Lsp _Opt

Information transmitting unit 703 is used for sending the information of representing described transmission parameter to transmitting terminal.

Wherein, channel information element 701 is used to obtain accumulation signal to noise ratio r _i

Transmission parameter acquiring unit 702 comprises:

The Lsp computing unit, being used to make j, b is definite value, P _iEqualing P, according to throughput Tsp computing formula, is that 0 o'clock pairing Lsp is preferred Lsp with Tsp to the derivative of Lsp, and wherein, described throughput calculation formula is:

$T_{\mathrm{sp}}=\frac{L_{\mathrm{sp}}-L_{\mathrm{CRC}}}{L_{\mathrm{sp}}}b{R}_s\frac{\underset{k=0}{\overset{j}{\mathrm{\Σ}}}\left\{\underset{i=1}{\overset{k}{\mathrm{\Π}}}\right\{1-{[1-P_e(b,{\mathrm{\γ}}_{i-1})]}^{\frac{L_{\mathrm{SP}}}{b}}\left\}{[1-P_e(b,{\mathrm{\γ}}_k)]}^{\frac{L_{\mathrm{SP}}}{b}}\right\}}{1+\underset{k=1}{\overset{j}{\mathrm{\Σ}}}\underset{i=1}{\overset{k}{\mathrm{\Π}}}\{1-{[1-P_e(b,{\mathrm{\γ}}_{i-1})]}^{\frac{L_{\mathrm{SP}}}{b}}\}}$

Wherein, L _CRCBe check code length, P _e(b, r _I-1) be the symbol error rate of the i-1 time re-transmission, R _SSymbolic number for the per second transmission; $1+\underset{k=1}{\overset{j}{\mathrm{\Σ}}}\underset{i=1}{\overset{k}{\mathrm{\Π}}}\{1-{[1-P_e(b,r_{i-1})]}^{\frac{L_{\mathrm{bs}}}{b}}\}$ Be the average transmission number of times;

The b computing unit is used for j, P _i, the resulting preferred Lsp of described Lsp computing unit brings described throughput calculation formula into, obtains the function of Tsp to b, pairing each Tsp when calculating b and in preset range, changing, asking the pairing b of maximum among described each Tsp is preferred b;

J and re-transmission power calculation unit are used for according to P _e(b, r _I-1), obtain the average gross power that sends of son bag, again divided by the average transmission number of times, obtain son bag average transmitting power to j and P _iFunction; Bring the resulting preferred Lsp of described Lsp computing unit, the resulting preferred b of described b computing unit into described throughput calculation formula, obtain Tsp j and P _iFunction, utilize described Tsp to j and P _iFunction and son bag average transmitting power to j and P _iFunction, pairing re-transmission power P when calculating j and in preset range, changing ₀And P _iAccording to j value, the pairing P of j value ₀And P _i, recomputate each Tsp, determine that the pairing j of maximum is preferred j among each Tsp, the preferred pairing P of j ₀And P _iBe the preferred power that retransmits;

The iterations control unit, be used for according to default iterations, control is with the resulting described preferred b of described b computing unit, the resulting preferred Lsp of described Lsp computing unit, described j and retransmit the resulting described preferred j of power calculation unit and pairing preferred re-transmission power is imported described Lsp computing unit and carried out interative computation.

The embodiment of the invention eight provides a kind of network system, comprises transmitting terminal, receiving terminal, wherein,

Described transmitting terminal is used to obtain the information of representing channel situation; According to the information of the expression channel situation of being obtained, obtain transmission parameter, described transmission parameter comprises: j _OptAnd pairing re-transmission magnitude of power P _Iopt, b _OptAnd Lsp _OptAccording to described transmission parameter, control bag sends to described receiving terminal;

Described receiving terminal is used to receive the child bag that described transmitting terminal sends.

Wherein, described receiving terminal also is used for feeding back to described transmitting terminal the information of described expression channel situation.

The embodiment of the invention nine provides a kind of network system, comprises transmitting terminal, receiving terminal, wherein,

Described receiving terminal is used to resolve received child bag, obtains channel information; According to described channel information, obtain transmission parameter, described transmission parameter comprises: j _OptAnd pairing re-transmission magnitude of power P _Iopt, b _OptAnd Lsp _OptSend the information of the described transmission parameter of expression to transmitting terminal;

Described transmitting terminal is used for the information according to the described transmission parameter of expression, and control bag sends.

As seen from the above analysis, the embodiment of the invention has following beneficial effect:

1, the transmitting terminal of the embodiment of the invention is adjusted the optimum number of retransmissions j of son bag according to channel information _OptAnd/or optimum sub-packet length Lsp _Opt, can when improving throughput, guarantee the efficiency of transmission that son wraps again.The receiving terminal of the embodiment of the invention is adjusted the optimum number of retransmissions j of son bag according to channel information _OptAnd/or optimum sub-packet length Lsp _Opt, will represent above-mentioned transmission parameter (j then _OptAnd/or Lsp _Opt) information send to transmitting terminal, make the transmitting terminal can be according to above-mentioned transmission parameter, the transmission of control bag guarantees the efficiency of transmission of son bag again when improving throughput.

2, the embodiment of the invention obtains b according to channel information _Opt, Lsp _Opt, optimum number of retransmissions j _OptWith pairing re-transmission magnitude of power as transmission parameter, control son bag sends, and throughput is provided greatly, has guaranteed the efficiency of transmission of sub-bag simultaneously again.

More than sub-packet transmission method, transmitting terminal, receiving terminal and network system that the embodiment of the invention provided are described in detail, for one of ordinary skill in the art, thought according to the embodiment of the invention, part in specific embodiments and applications all can change, in sum, this description should not be construed as limitation of the present invention.

Claims (22)

1, a kind of sub-packet transmission method is characterized in that, comprising:

Transmitting terminal obtains the information of expression channel situation;

According to the information of the expression channel situation of being obtained, obtain transmission parameter, described transmission parameter comprises: the optimum number of retransmissions j of son bag _OptWith the sub-packet length Lsp of optimum _OptIn at least one;

According to described transmission parameter, control bag sends.

2, method according to claim 1 is characterized in that,

Described information according to the expression channel situation of being obtained, obtain transmission parameter and be specially:

According to the information of the expression channel situation that prestores and the corresponding relation of transmission parameter, obtain the pairing transmission parameter of information of described expression channel situation;

The information of described expression channel situation is: the sequence number in the channel feedback correspondence table, accumulation signal to noise ratio r _i, the signal to noise ratio snr that retransmits for the i time _iOr the channel response h when retransmitting for the i time _i, wherein, i is from 1 to j, and j is a maximum retransmission.

3, method according to claim 1 is characterized in that, the information that described transmitting terminal obtains the expression channel situation is specially: described transmitting terminal obtains accumulation signal to noise ratio r _i, wherein, i is from 1 to j, and j is a maximum retransmission.

4, method according to claim 3 is characterized in that,

Described transmitting terminal obtains accumulation signal to noise ratio r _iBe specially:

The signal to noise ratio snr that the i time of obtaining that receiving terminal feeds back of transmitting terminal retransmits _i, perhaps, the received packet from receiving terminal of described transmitting terminal decoding local terminal obtains described signal to noise ratio snr _i

According to the SNR that is obtained _i, ask corresponding accumulation signal to noise ratio r _i

5, method according to claim 3 is characterized in that,

Described transmitting terminal obtains accumulation signal to noise ratio r _iBe specially:

Described transmitting terminal obtains the described h that receiving terminal feeds back _i, perhaps, the received packet from receiving terminal of described transmitting terminal decoding local terminal obtains described h _i

According to the h that is obtained _i, ask corresponding accumulation signal to noise ratio r _i

6, method according to claim 3 is characterized in that,

Described transmitting terminal obtains accumulation signal to noise ratio r _iBe specially:

Described transmitting terminal receives the accumulation signal to noise ratio r that receiving terminal fed back _i

7, method according to claim 3 is characterized in that,

The described transmission parameter that obtains is specially:

Making modulation bit count b, sub-packet length Lsp is definite value, the 0th re-transmission power P ₀With the i time re-transmission power P _iEqual P, according to throughput Tsp computing formula, obtain the function of Tsp to j, described throughput calculation formula is:

$T_{\mathrm{sp}}=\frac{L_{\mathrm{sp}}-L_{\mathrm{CRC}}}{L_{\mathrm{sp}}}{\mathrm{bR}}_s\frac{\underset{k=0}{\overset{j}{\mathrm{\Σ}}}\left\{\underset{i=1}{\overset{k}{\mathrm{\Π}}}\right\{1-{[1-P_e(b,{\mathrm{\γ}}_{i-1})]}^{\frac{L_{\mathrm{SP}}}{b}}\left\}{[1-P_e(b,{\mathrm{\γ}}_k)]}^{\frac{L_{\mathrm{SP}}}{b}}\right\}}{1+\underset{k=1}{\overset{j}{\mathrm{\Σ}}}\underset{i=1}{\overset{k}{\mathrm{\Π}}}\{1-{[1-P_e(b,{\mathrm{\γ}}_{i-1})]}^{\frac{L_{\mathrm{SP}}}{b}}\}}$

Wherein, L _CRCBe check code length, P _e(b, r _I-1) be the symbol error rate of the i-1 time re-transmission, R _SSymbolic number for the per second transmission;

Pairing each Tsp when calculating j changes in preset range asks the maximum among described each Tsp;

Obtain the pairing j of described maximum as optimum number of retransmissions j _Opt

8, method according to claim 3 is characterized in that, described transmission parameter comprises: described j _OptAnd pairing re-transmission power;

The described transmission parameter that obtains is specially:

Make that b, Lsp are definite value, according to the throughput calculation formula, obtain Tsp to j and retransmit the function of power, wherein, described throughput calculation formula is:

$T_{\mathrm{sp}}=\frac{L_{\mathrm{sp}}-L_{\mathrm{CRC}}}{L_{\mathrm{sp}}}{\mathrm{bR}}_s\frac{\underset{k=0}{\overset{j}{\mathrm{\Σ}}}\left\{\underset{i=1}{\overset{k}{\mathrm{\Π}}}\right\{1-{[1-P_e(b,{\mathrm{\γ}}_{i-1})]}^{\frac{L_{\mathrm{SP}}}{b}}\left\}{[1-P_e(b,{\mathrm{\γ}}_k)]}^{\frac{L_{\mathrm{SP}}}{b}}\right\}}{1+\underset{k=1}{\overset{j}{\mathrm{\Σ}}}\underset{i=1}{\overset{k}{\mathrm{\Π}}}\{1-{[1-P_e(b,{\mathrm{\γ}}_{i-1})]}^{\frac{L_{\mathrm{SP}}}{b}}\}}$

Wherein, L _CRCBe check code length, P _e(b, r _I-1) be the symbol error rate of the i-1 time re-transmission, R _SSymbolic number for the per second transmission; $1+\underset{k=1}{\overset{j}{\mathrm{\Σ}}}\underset{i=1}{\overset{k}{\mathrm{\Π}}}\{1-{[1-P_e(b,r_{i-1})]}^{\frac{L_{\mathrm{SP}}}{b}}\}$ Be the average transmission number of times;

According to P _e(b, r _I-1), obtain the average gross power that sends of sub-bag, described son is wrapped the average gross power that sends divided by described average transmission number of times, obtain the function of son bag average transmitting power to j and re-transmission power thereof;

Utilize described Tsp that the function and the son of j and re-transmission power thereof are wrapped the function of average transmitting power to j and re-transmission power thereof, pairing re-transmission power when calculating j changes in preset range; According to the j value with calculate the re-transmission power of resulting correspondence, recomputate each Tsp, determine that the pairing j of maximum is j among each Tsp _Opt, j _OptPairing re-transmission power is the optimum power that retransmits.

9, method according to claim 3 is characterized in that,

The described transmission parameter that obtains is specially:

A, make that j, b are definite value, retransmit power P the 0th time ₀With the i time re-transmission power P _iEqualing P, according to the throughput calculation formula, is that 0 o'clock pairing Lsp is preferred Lsp with Tsp to the derivative of Lsp, and wherein, described throughput calculation formula is:

$T_{\mathrm{sp}}=\frac{L_{\mathrm{sp}}-L_{\mathrm{CRC}}}{L_{\mathrm{sp}}}{\mathrm{bR}}_s\frac{\underset{k=0}{\overset{j}{\mathrm{\Σ}}}\left\{\underset{i=1}{\overset{k}{\mathrm{\Π}}}\right\{1-{[1-P_e(b,{\mathrm{\γ}}_{i-1})]}^{\frac{L_{\mathrm{SP}}}{b}}\left\}{[1-P_e(b,{\mathrm{\γ}}_k)]}^{\frac{L_{\mathrm{SP}}}{b}}\right\}}{1+\underset{k=1}{\overset{j}{\mathrm{\Σ}}}\underset{i=1}{\overset{k}{\mathrm{\Π}}}\{1-{[1-P_e(b,{\mathrm{\γ}}_{i-1})]}^{\frac{L_{\mathrm{SP}}}{b}}\}}$

Wherein, L _CRCBe check code length, P _e(b, r _I-1) be the symbol error rate of the i-1 time re-transmission, R _SSymbolic number for the per second transmission; $1+\underset{k=1}{\overset{j}{\mathrm{\Σ}}}\underset{i=1}{\overset{k}{\mathrm{\Π}}}\{1-{[1-P_e(b,r_{i-1})]}^{\frac{L_{\mathrm{bs}}}{b}}\}$ Be the average transmission number of times;

B, with j, P ₀And P _i, preferred Lsp brings described throughput calculation formula into, obtains the function of Tsp to b, pairing each Tsp when calculating b and in preset range, changing, asking the pairing b of maximum among described each Tsp is preferred b;

C, according to P _e(b, r _I-1), obtain son and wrap the average gross power that sends, again divided by the average transmission number of times, obtain the function of son bag average transmitting power to j and re-transmission power thereof; Bring preferred Lsp, preferred b into described throughput calculation formula, obtain Tsp j and re-transmission power P thereof ₀And P _iFunction, utilize described Tsp to j and retransmit power P ₀And P _iFunction and son bag average transmitting power to j and retransmit power P ₀And P _iFunction, pairing re-transmission power P when calculating j and in preset range, changing ₀And P _iAccording to the j value with calculate the re-transmission power P of resulting correspondence ₀And P _i, recomputate each Tsp, determine that the pairing j of maximum is preferred j among each Tsp, the preferred pairing re-transmission power of j is the preferred power that retransmits;

D, the default iterations of basis are with described preferred b, preferred Lsp, preferred j and pairing preferred re-transmission power P ₀And P _iCarry out interative computation according to steps A, B, C, obtain optimal bit and count b _Opt, optimum sub-packet length Lsp _Opt, optimum number of retransmissions j _OptAnd the pairing optimum power that retransmits.

10, a kind of sub-packet transmission method is characterized in that, comprising:

Receiving terminal is resolved received child bag, obtains channel information;

According to described channel information, obtain transmission parameter, described transmission parameter comprises: optimum number of retransmissions j _OptWith the sub-packet length Lsp of optimum _OptIn at least one;

Send the information of the described transmission parameter of expression to transmitting terminal.

11, method according to claim 10 is characterized in that,

Described receiving terminal obtains channel information and is specially:

Described receiving terminal obtains accumulation signal to noise ratio r _i, wherein, i is from 1 to j, and j is a maximum retransmission.

12, method according to claim 11 is characterized in that,

The described transmission parameter that obtains is specially:

A, make that j, b are definite value, retransmit power P the 0th time ₀With the i time re-transmission power P _iEqualing P, according to the throughput calculation formula, is that 0 o'clock pairing Lsp is preferred Lsp with Tsp to the derivative of Lsp, and wherein, described throughput calculation formula is:

$T_{\mathrm{sp}}=\frac{L_{\mathrm{sp}}-L_{\mathrm{CRC}}}{L_{\mathrm{sp}}}{\mathrm{bR}}_s\frac{\underset{k=0}{\overset{j}{\mathrm{\Σ}}}\left\{\underset{i=1}{\overset{k}{\mathrm{\Π}}}\right\{1-{[1-P_e(b,{\mathrm{\γ}}_{i-1})]}^{\frac{L_{\mathrm{SP}}}{b}}\left\}{[1-P_e(b,{\mathrm{\γ}}_k)]}^{\frac{L_{\mathrm{SP}}}{b}}\right\}}{1+\underset{k=1}{\overset{j}{\mathrm{\Σ}}}\underset{i=1}{\overset{k}{\mathrm{\Π}}}\{1-{[1-P_e(b,{\mathrm{\γ}}_{i-1})]}^{\frac{L_{\mathrm{SP}}}{b}}\}}$

Wherein, L _CRCBe check code length, P _e(b, r _I-1) be the symbol error rate of the i-1 time re-transmission, R _SSymbolic number for the per second transmission; $1+\underset{k=1}{\overset{j}{\mathrm{\Σ}}}\underset{i=1}{\overset{k}{\mathrm{\Π}}}\{1-{[1-P_e(b,r_{i-1})]}^{\frac{L_{\mathrm{bs}}}{b}}\}$ Be the average transmission number of times;

B, with j, P ₀And P _i, preferred Lsp brings described throughput calculation formula into, obtains the function of Tsp to b, pairing each Tsp when calculating b and in preset range, changing, asking the pairing b of maximum among described each Tsp is preferred b;

C, according to P _e(b, r _I-1), obtain son and wrap the average gross power that sends, again divided by the average transmission number of times, obtain the function of son bag average transmitting power to j and re-transmission power thereof; Bring preferred Lsp, preferred b into described throughput calculation formula, obtain Tsp j and re-transmission power P thereof ₀And P _iFunction, utilize described Tsp to j and retransmit power P ₀And P _iFunction and son bag average transmitting power to j and retransmit power P ₀And P _iFunction, pairing re-transmission power P when calculating j and in preset range, changing ₀And P _iAccording to the j value with calculate the re-transmission power P of resulting correspondence ₀And P _i, recomputate each Tsp, determine that the pairing j of maximum is preferred j among each Tsp, the preferred pairing re-transmission power of j is the preferred power that retransmits;

D, the default iterations of basis are with described preferred b, preferred Lsp, preferred j and pairing preferred re-transmission power P ₀And P _iCarry out interative computation according to steps A, B, C, obtain optimal bit and count b _Opt, optimum sub-packet length Lsp _Opt, optimum number of retransmissions j _OptAnd the pairing optimum power that retransmits.

13, method according to claim 10 is characterized in that,

The information that sends the described transmission parameter of expression to transmitting terminal is specially:

Obtain the sequence number of described transmission parameter in the channel feedback correspondence table, send described sequence number to described transmitting terminal.

14, a kind of transmitting terminal is characterized in that, comprising:

Information acquisition unit is used to obtain the information of representing channel situation;

The transmission parameter acquiring unit is used for the information according to the expression channel situation of being obtained, and obtains transmission parameter, and described transmission parameter comprises: the optimum number of retransmissions j of son bag _OptWith the sub-packet length Lsp of optimum _OptIn at least one;

Son bag transmitting element is used for according to described transmission parameter, and control bag sends.

15, transmitting terminal according to claim 14 is characterized in that,

Described transmission parameter acquiring unit is used for obtaining the pairing transmission parameter of information of described expression channel situation according to the information of the expression channel situation that prestores and the corresponding relation of transmission parameter.

16, transmitting terminal according to claim 14 is characterized in that,

Described information acquisition unit is used to obtain accumulation signal to noise ratio r _i, wherein, i is from 1 to j, and j is a maximum retransmission.

17, transmitting terminal according to claim 16 is characterized in that,

Described transmission parameter acquiring unit comprises:

The Lsp computing unit, being used to make j, b is definite value, P ₀And P _iEqualing P, according to throughput Tsp computing formula, is that 0 o'clock pairing Lsp is preferred Lsp with Tsp to the derivative of Lsp, and wherein, described throughput calculation formula is:

$T_{\mathrm{sp}}=\frac{L_{\mathrm{sp}}-L_{\mathrm{CRC}}}{L_{\mathrm{sp}}}{\mathrm{bR}}_s\frac{\underset{k=0}{\overset{j}{\mathrm{\Σ}}}\left\{\underset{i=1}{\overset{k}{\mathrm{\Π}}}\right\{1-{[1-P_e(b,{\mathrm{\γ}}_{i-1})]}^{\frac{L_{\mathrm{SP}}}{b}}\left\}{[1-P_e(b,{\mathrm{\γ}}_k)]}^{\frac{L_{\mathrm{SP}}}{b}}\right\}}{1+\underset{k=1}{\overset{j}{\mathrm{\Σ}}}\underset{i=1}{\overset{k}{\mathrm{\Π}}}\{1-{[1-P_e(b,{\mathrm{\γ}}_{i-1})]}^{\frac{L_{\mathrm{SP}}}{b}}\}}$

Wherein, L _CRCBe check code length, P _e(b, r _I-1) be the symbol error rate of the i-1 time re-transmission, R _SSymbolic number for the per second transmission; $1+\underset{k=1}{\overset{j}{\mathrm{\Σ}}}\underset{i=1}{\overset{k}{\mathrm{\Π}}}\{1-{[1-P_e(b,r_{i-1})]}^{\frac{L_{\mathrm{bs}}}{b}}\}$ Be the average transmission number of times;

The b computing unit is used for j, P ₀And P _i, the resulting preferred Lsp of described Lsp computing unit brings described throughput calculation formula into, obtains the function of Tsp to b, pairing each Tsp when calculating b and in preset range, changing, asking the pairing b of maximum among described each Tsp is preferred b;

J and re-transmission power calculation unit are used for according to P _e(b, r _I-1), obtain son and wrap the average gross power that sends, again divided by the average transmission number of times, obtain son bag average transmitting power to j and re-transmission power P thereof ₀And P _iFunction; Bring the resulting preferred Lsp of described Lsp computing unit, the resulting preferred b of described b computing unit into described throughput calculation formula, obtain Tsp j and re-transmission power P thereof ₀And P _iFunction, utilize described Tsp to j and retransmit power P ₀And P _iFunction and son bag average transmitting power to j and retransmit power P ₀And P _iFunction, pairing re-transmission power P when calculating j and in preset range, changing ₀And P _iAccording to j value, the pairing re-transmission power P of j value ₀And P _i, recomputate each Tsp, determine that the pairing j of maximum is preferred j among each Tsp, the preferred pairing re-transmission power P of j ₀And P _iBe the preferred power that retransmits;

The iterations control unit, be used for according to default iterations, control is with the resulting described preferred b of described b computing unit, described j and retransmit the resulting described preferred j of power calculation unit and pairing preferred re-transmission power is imported described Lsp computing unit and carried out interative computation.

18, a kind of receiving terminal is characterized in that, comprising:

The channel information acquiring unit is used to resolve received child bag, obtains channel information;

The transmission parameter acquiring unit is used for obtaining transmission parameter according to described channel information, and described transmission parameter comprises: optimum number of retransmissions j _OptWith the sub-packet length Lsp of optimum _OptIn at least one;

Information transmitting unit is used for sending the information of representing described transmission parameter to transmitting terminal.

19, receiving terminal according to claim 18 is characterized in that,

Described channel information acquiring unit is used to obtain accumulation signal to noise ratio r _i, wherein, i is from 1 to j, and j is a maximum retransmission.

20, receiving terminal according to claim 19 is characterized in that,

Described transmission parameter acquiring unit comprises:

The Lsp computing unit, being used to make j, b is definite value, P ₀And P _iEqualing P, according to throughput Tsp computing formula, is that 0 o'clock pairing Lsp is preferred Lsp with Tsp to the derivative of Lsp, and wherein, described throughput calculation formula is:

$T_{\mathrm{sp}}=\frac{L_{\mathrm{sp}}-L_{\mathrm{CRC}}}{L_{\mathrm{sp}}}{\mathrm{bR}}_s\frac{\underset{k=0}{\overset{j}{\mathrm{\Σ}}}\left\{\underset{i=1}{\overset{k}{\mathrm{\Π}}}\right\{1-{[1-P_e(b,{\mathrm{\γ}}_{i-1})]}^{\frac{L_{\mathrm{SP}}}{b}}\left\}{[1-P_e(b,{\mathrm{\γ}}_k)]}^{\frac{L_{\mathrm{SP}}}{b}}\right\}}{1+\underset{k=1}{\overset{j}{\mathrm{\Σ}}}\underset{i=1}{\overset{k}{\mathrm{\Π}}}\{1-{[1-P_e(b,{\mathrm{\γ}}_{i-1})]}^{\frac{L_{\mathrm{SP}}}{b}}\}}$

Wherein, L _CRCBe check code length, P _e(b, r _I-1) be the symbol error rate of the i-1 time re-transmission, R _SSymbolic number for the per second transmission; $1+\underset{k=1}{\overset{j}{\mathrm{\Σ}}}\underset{i=1}{\overset{k}{\mathrm{\Π}}}\{1-{[1-P_e(b,r_{i-1})]}^{\frac{L_{\mathrm{bs}}}{b}}\}$ Be the average transmission number of times;

The b computing unit is used for j, P ₀And P _i, the resulting preferred Lsp of described Lsp computing unit brings described throughput calculation formula into, obtains the function of Tsp to b, pairing each Tsp when calculating b and in preset range, changing, asking the pairing b of maximum among described each Tsp is preferred b;

J and re-transmission power calculation unit are used for according to P _e(b, r _I-1), obtain son and wrap the average gross power that sends, again divided by the average transmission number of times, obtain son bag average transmitting power to j and re-transmission power P thereof ₀And P _iFunction; Bring the resulting preferred Lsp of described Lsp computing unit, the resulting preferred b of described b computing unit into described throughput calculation formula, obtain Tsp j and re-transmission power P thereof ₀And P _iFunction, utilize described Tsp to j and retransmit power P ₀And P _iFunction and son bag average transmitting power to j and retransmit power P ₀And P _iFunction, pairing re-transmission power P when calculating j and in preset range, changing ₀And P _iAccording to j value, the pairing re-transmission power P of j value ₀And P _i, recomputate each Tsp, determine that the pairing j of maximum is preferred j among each Tsp, the preferred pairing re-transmission power P of j ₀And P _iBe the preferred power that retransmits;

The iterations control unit, be used for according to default iterations, control is with the resulting described preferred b of described b computing unit, described j and retransmit the resulting described preferred j of power calculation unit and pairing preferred re-transmission power is imported described Lsp computing unit and carried out interative computation.

21, a kind of network system is characterized in that, comprises transmitting terminal, receiving terminal, wherein,

Described transmitting terminal is used to obtain the information of representing channel situation; According to the information of the expression channel situation of being obtained, obtain transmission parameter, described transmission parameter comprises: the optimum number of retransmissions j of son bag _OptWith the sub-packet length Lsp of optimum _OptIn at least one; According to described transmission parameter, control bag sends to described receiving terminal;

Described receiving terminal is used to receive the child bag that described transmitting terminal sends.

22, a kind of network system is characterized in that, comprises transmitting terminal, receiving terminal, wherein,

Described receiving terminal is used to resolve received child bag, obtains channel information; According to described channel information, obtain transmission parameter, described transmission parameter comprises: optimum number of retransmissions j _OptWith the sub-packet length Lsp of optimum _OptIn at least one; Send the information of the described transmission parameter of expression to transmitting terminal;

Described transmitting terminal is used for the information according to the described transmission parameter of expression, and control bag sends.

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