CN104660371A - Frequency-division modulation type opportunistic cooperative QoS (quality of service) guarantee method based on channel state sensing - Google Patents

Abstract

The invention discloses a frequency-division modulation type opportunistic cooperative QoS (quality of service) guarantee method based on channel state sensing. The method comprises the following steps: a sending-end node is used for selecting direct transmission or opportunistic cooperative transmission according to Pct/Ptotal and a thresholding, selecting one of control schemes established by a cooperative node number M, a channel state hi, Pct/Ptotal and a maximum retransmission number Nmax for a change rule of the throughput rate SARQ, the packet loss rate PARQ, the average round trip delay TARQ and the energy efficiency eta ARQ, adding an identification code into a start bit of signal data, performing 12-frequency-division type QPSK (quadrature phase shift keying) modulation on the signal data, and sending the signal data; relay nodes are similar to the sending-end node; a receiving-end node is used for judging a start bit of a received signal data packet, directly demodulating and decoding the signal data packet if direct transmission is selected, and performing 12-frequency-division type QPSK demodulation and decoding if opportunistic cooperative control scheme coding is selected. The method fully considers inherent properties of mobile terminal equipment and the reliable, efficient and stable cooperative QoS guarantee method capable of meeting demands of various applications is opportunistically established.

Description

Based on the division modulation type opportunistic cooperation QoS assurance of channel status perception

Technical field

The present invention relates to a kind of QoS assurance, particularly relate to a kind of division modulation type opportunistic cooperation QoS assurance based on channel status perception, belong to radio communication service quality assurance technical field.

Background technology

The mobile terminal device that the opportunistic cooperation communication technology makes communication system opportunistic select to meet certain condition provides QoS by the transfer of data that the mode of cooperative cooperating is transmitting terminal and receiving terminal, and (English full name is: Quality of Services, Chinese is: service quality) ensure, via node shares self Time and place resource, thus the multidimensional diversity gains such as the time of acquisition, space and frequency, ensure performance in wireless communication systems.And in Internet of Things, wireless sensor network or wireless self-organization network, the operating efficiency of each mobile node or life cycle are subject to from aspect constraints such as supply power mode, internal noise or unknown mobility, during remote or long-time communication, system effectiveness is lower, and the quality of data can not get effectively, reliably ensureing.In collaboration communication process, opportunistic sets up transmission plan, by multiple via node time coordination, space and frequency cooperation for end-to-end communication provides guaranteed reliability, the internal noise and the external environment parameter that reduce isomery mobile node cause signal intensity attenuation, delay distortion, improve the quality of data, improve resource utilization ratio, for user provides satisfied QoS to ensure.

Opportunistic cooperation communication in Internet of Things, wireless sensor network or wireless self-organization network and direct mode are compared with cooperation transmission mode has following characteristics, main manifestations is: one, the mobile terminal internal noise source of different communication systems and the influence degree difference to quality of data generation thereof, the extraneous parameter of different application environment is different to the interference degrees of Signal transmissions, the diversity feature of necessary perception mobile terminal own physical attribute and electrical characteristic and operational environment state in opportunistic cooperation transmitting procedure; They are two years old, for the different network architectures and system application, all kinds of link terminal nodes add the time controling of cooperation transmission, space is disposed and parallel compensate, and the problems such as the control of cooperation transmission and opportunistic cooperation transmission control program that exit become opportunistic cooperation technology key issue in actual applications; They are three years old, research diversity QoS safeguard system and control method, meet single performance or the requirements of support of many performance synthesises of user, improving the power consumption of mobile terminal device in Internet of Things, wireless sensor network or wireless self-organization network, throughput, time delay and packet loss, is the significant challenge that the opportunistic cooperation communications field faces.

In sum, due to heterogeneous networks framework and application demand, the intrinsic physics of isomery mobile terminal device and the particularity such as the restriction of electric attribute and the dynamic topology of cordless communication network, use directly transmission or static cooperation transmission method cannot meet the requirements of support of the diversity Mobile solution business of Internet of Things, wireless sensor network or wireless self-organization network.Given this, the applicant has done useful design, and technical scheme described below produces under this background.

Summary of the invention

For above-mentioned the deficiencies in the prior art, the object of this invention is to provide a kind of division modulation type opportunistic cooperation QoS assurance based on channel status perception, by real-time perception Internet of Things, wireless sensor network or wireless self-organization network state, sender node and relaying mobile device node form opportunistic cooperation QoS safeguard system, real-time perception channel status builds the opportunistic cooperation transmission plan with unicity or composite type QoS guarantee, provides the aspect guarantees such as reliability, real-time, sustainability and high efficiency for all kinds of Mobile solution.

Technical scheme of the present invention is such: a kind of division modulation type opportunistic cooperation QoS assurance based on channel status perception, comprises the following steps:

S01, sender node are by P _ct/ P _totalcompared with threshold value, if P _ct/ P _totalbe greater than threshold value, then adopt direct mode to enter S04, if P to the zero setting of signal data start bit _ct/ P _totalbe less than or equal to threshold value, enter S02;

S02, by cooperative node number M, channel status h _i, P _ct/ P _totalwith the maximum retransmission N of link layer ARQ _maxto throughput S _aRQ, packet loss P _aRQ, average RTT T _aRQwith efficiency η _aRQchanging Pattern set up six opportunistic cooperation control programs, and to six opportunistic cooperation control programs coding, each Cooperation controlling scheme determines one group of cooperative node number M and maximum retransmission N _max;

S03, sender node are selected an opportunistic cooperation control program and corresponding scheme code are added signal data start bit, then carry out 12 frequency division type QPSK to signal data and modulate;

Send signal data after S04, interpolation cyclic redundancy check (CRC) code, intercept channel, if the NAK received from via node wraps, then according to the maximum retransmission N that the opportunistic cooperation control program selected in S03 is determined simultaneously _maxcarry out signal data re-transmission, otherwise continue to send signal data;

S05, M via node is selected an opportunistic cooperation control program respectively and corresponding scheme code is added signal data start bit, then carries out 12 frequency division type QPSK to signal data and modulates;

Signal data is sent after S06, interpolation cyclic redundancy check (CRC) code, intercept channel simultaneously, if the ACK received from receiving terminal node wraps, continue to send signal data, if the NAK received from receiving terminal node wraps, then according to the maximum retransmission N that the opportunistic cooperation control program selected in S05 is determined _maxcarry out signal data re-transmission;

If S07 via node carries out signal data number of retransmissions in opportunistic cooperation control procedure be greater than maximum retransmission N in S06 _maxthen send NAK bag by feedback channel to sender node, request sender node retransmits;

S08, receiving terminal node judge the start bit of the signal data bag received, if directly transmission is then to the direct demodulating and decoding of signal data bag, if opportunistic cooperation control program coding then carries out 12 frequency division type QPSK demodulating and decodings, all the other situations abandon signal data bag and feed back NAK bag;

S09, execution CRC check, reach upper strata and send ACK bag by feedback channel simultaneously, otherwise feed back NAK bag after initiatively abandoning signal data bag after confirmation signal packet is errorless.

Further, described threshold value is affecting laws threshold value, the channel status h of cooperative node number M to signal to noise ratio snr _ito affecting laws threshold value, the channel status h of signal to noise ratio snr _ito interruption probability P _outaffecting laws threshold value and channel status h _ito error rate P _baffecting laws threshold value in maximum.

Further, described cooperative node number M is to the affecting laws threshold value of signal to noise ratio snr and channel status h _ito the affecting laws threshold value of signal to noise ratio snr by formula $\left\{\begin{array}{c}\mathrm{SNR}=f\left({\left|h_i\right|}^2\right)\\ f\left(x\right)=\frac{E_0}{N_0*d_l^l}\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}S{l}_i[P_{\mathrm{total}}-(2M-1)P_{\mathrm{ct}}]x\end{array}\right.$ Obtain, described channel status h _ito interruption probability P _outaffecting laws threshold value by formula $\left\{\begin{array}{c}\mathrm{SNR}=f\left({\left|h_i\right|}^2\right)\\ f\left(x\right)=\frac{E_0}{N_0*d_l^l}\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}S{l}_i[P_{\mathrm{total}}-(2M-1)P_{\mathrm{ct}}]x\end{array}\right.$ And P _out=P (SNR < α)=1-SNR/ α obtains, described channel status h _ito error rate P _baffecting laws threshold value by formula $\left\{\begin{array}{c}\mathrm{SNR}=f\left({\left|h_i\right|}^2\right)\\ f\left(x\right)=\frac{E_0}{N_0*d_l^l}\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}S{l}_i[P_{\mathrm{total}}-(2M-1)P_{\mathrm{ct}}]x\end{array}\right.$ With $P_b=\frac{1}{2}{e}^{f\left({\left|h_i\right|}^2\right)\mathrm{\&gamma;}}$ Obtain.

Further, described cooperative node number M, channel status h _i, P _ct/ P _totalwith the maximum retransmission N of link layer ARQ _maxto throughput S _aRQ, packet loss P _aRQ, average RTT T _aRQwith efficiency η _aRQchanging Pattern by formula $\left\{\begin{array}{c}{S}_{\mathrm{ARQ}}=\frac{l_{\mathrm{payload}}}{l_{\mathrm{DATA}}+l_{\mathrm{ACK}}}g(h_i,N_{\max })\\ g(h_i,N_{\max })=(1-(1-(1-\frac{1}{2}{e}^{f\left({\left|h_i\right|}^2\right)\frac{B_N}{2R_{\mathrm{radio}}}})l_{\mathrm{DATA}})N_{\max }+1)\end{array}\right.,$ $\left\{\begin{array}{c}{P}_{\mathrm{ARQ}}=h(h_i,N_{\max })\\ h(h_i,N_{\max })=(1-(1-(1-\frac{1}{2}{e}^{f\left({\left|h_i\right|}^2\right)\frac{B_N}{2R_{\mathrm{radio}}}})l_{\mathrm{DATA}})N_{\max }+1)\end{array}\right.,$ $T_{\mathrm{ARQ}}=T\frac{1-h{(h_i,N_{\max })}^{N_{\max }+1}}{1-h(h_i,N_{\max })}$ With ${\mathrm{\&eta;}}_{\mathrm{ARQ}}=\frac{E_{\mathrm{effi}}}{E_{\mathrm{total}}}(1-P_{\mathrm{ARQ}})=\frac{l_{\mathrm{payload}}}{l_{\mathrm{DATA}}+l_{\mathrm{ACK}}}(l-h(h_i,N_{\max }))$ Determine.

Further, described six opportunistic cooperation control programs coding is respectively 001,010,011,100,101 and 110.

The beneficial effect of technical scheme provided by the present invention is, the present invention adopts the communication system performance analysis of channel status perception, analyzes signal to noise ratio snr, outage probability P according to different network states and mobile reception End node state real-time judge _outwith error rate P _bchanging Pattern, in conjunction with throughput S _aRQ, packet loss P _aRQ, average RTT T _aRQwith efficiency η _aRQchanging Pattern build diversity Adaptive QoS safeguards system.Sender node selects killer opportunity cooperation guarantee plan according to channel status and perception mobile device status; Via node and receiving terminal node are worked in coordination with according to user's request, network state and self-characteristic and sender node and are built opportunistic guarantee plan, and devise 12 frequency division type QPSK modulation scheme and circuit thereof.The present invention compared with prior art, the beneficial effect had is: the channel status of real-time perception Internet of Things, wireless sensor network or wireless self-organization network, take into full account mobile terminal device build-in attribute, opportunistic is set up can meet types of applications and reliable, efficient and stable cooperation QoS assurance.

Accompanying drawing explanation

Fig. 1 is opportunistic cooperation QoS safeguard system framework and workflow schematic diagram.

Fig. 2 is that cooperative node number M affects Changing Pattern schematic diagram to signal to noise ratio snr.

Fig. 3 is channel status h _ichanging Pattern schematic diagram is affected on signal to noise ratio snr.

Fig. 4 is channel status h _ito interruption probability P _outaffect Changing Pattern schematic diagram.

Fig. 5 is channel status h _ito bit error rate P _baffect Changing Pattern schematic diagram.

Fig. 6 is maximum retransmission N _maxchannel status h when being 1 _ito packet loss P _aRQaffecting laws schematic diagram.

Fig. 7 is maximum retransmission N _maxchannel status h when being 2 _ito packet loss P _aRQaffecting laws schematic diagram.

Fig. 8 is maximum retransmission N _maxchannel status h when being 3 _ito packet loss P _aRQaffecting laws schematic diagram.

Fig. 9 is maximum retransmission N _maxchannel status h when being 4 _ito packet loss P _aRQaffecting laws schematic diagram.

Figure 10 is cooperative node number M and P _ctwith P _totalchannel status h when ratio is fixed _ito packet loss P _aRQaffecting laws schematic diagram.

Figure 11 is maximum retransmission N _maxchannel status h when being 1 _ito throughput S _aRQaffecting laws schematic diagram.

Figure 12 is maximum retransmission N _maxchannel status h when being 2 _ito throughput S _aRQaffecting laws schematic diagram.

Figure 13 is maximum retransmission N _maxchannel status h when being 3 _ito throughput S _aRQaffecting laws schematic diagram.

Figure 14 is maximum retransmission N _maxchannel status h when being 4 _ito throughput S _aRQaffecting laws schematic diagram.

To be cooperative node number M be Figure 15 1 and P _ctwith P _totalmaximum retransmission N when ratio is 0.1 _maxto throughput S _aRQaffecting laws schematic diagram.

To be cooperative node number M be Figure 16 1 and P _ctwith P _totalmaximum retransmission N when ratio is 0.3 _maxto throughput S _aRQaffecting laws schematic diagram.

To be cooperative node number M be Figure 17 2 and P _ctwith P _totalmaximum retransmission N when ratio is 0.1 _maxto throughput S _aRQaffect Changing Pattern schematic diagram.

To be cooperative node number M be Figure 18 2 and P _ctwith P _totalmaximum retransmission N when ratio is 0.3 _maxto throughput S _aRQaffecting laws schematic diagram.

Figure 19 is channel status h _ito average RTT T _aRQaffecting laws schematic diagram.

To be cooperative node number M be Figure 20 1 and P _ctwith P _totalmaximum retransmission N when ratio is 0.1 _maxto average RTT T _aRQaffecting laws schematic diagram.

To be cooperative node number M be Figure 21 1 and P _ctwith P _totalmaximum retransmission N when ratio is 0.3 _maxto average RTT T _aRQaffecting laws schematic diagram.

To be cooperative node number M be Figure 22 2 and P _ctwith P _totalmaximum retransmission N when ratio is 0.1 _maxto average RTT T _aRQaffect Changing Pattern schematic diagram.

To be cooperative node number M be Figure 23 2 and P _ctwith P _totalmaximum retransmission N when ratio is 0.3 _maxto average RTT T _aRQaffecting laws schematic diagram.

Figure 24 is channel status h _ito efficiency η _aRQaffecting laws schematic diagram.

To be cooperative node number M be Figure 25 1 and P _ctwith P _totalmaximum retransmission N when ratio is 0.1 _maxto efficiency η _aRQaffecting laws schematic diagram.

To be cooperative node number M be Figure 26 1 and P _ctwith P _totalmaximum retransmission N when ratio is 0.3 _maxto efficiency η _aRQaffecting laws schematic diagram.

To be cooperative node number M be Figure 27 2 and P _ctwith P _totalmaximum retransmission N when ratio is 0.1 _maxto efficiency η _aRQaffect Changing Pattern schematic diagram.

To be cooperative node number M be Figure 28 2 and P _ctwith P _totalmaximum retransmission N when ratio is 0.3 _maxto efficiency η _aRQaffecting laws schematic diagram.

Figure 29 is 12 frequency division QPSK modulation signals waveform schematic diagrames.

Figure 30 is 12 frequency division QPSK coded modulation schematic diagrames.

Figure 31 is the QPSK modulation circuit schematic diagram of 12 frequency divisions

Figure 32 is sender node, via node and receiving terminal node coded modulation decoding demodulating process schematic diagram.

Embodiment

Below in conjunction with embodiment, the invention will be further described, but not as a limitation of the invention.

Refer to Fig. 1, opportunistic cooperation QoS safeguard system is described.In Internet of Things, wireless sensor network or wireless self-organization network, set up end-to-end communication between sender node and receiving terminal node, transfer of data can adopt two kinds of patterns: directly transmission or opportunistic cooperation transmission.Sender node network state is defined as { cooperative node number M, signal to noise ratio snr, channel status h _i, outage probability P _out, error rate P _b, receiving terminal node network state is defined as { enlivens probability Sl _i, system total power P _total, transmitting power P _t, processing of circuit energy consumption P _ct.Wherein sender node network state parameters value can be monitored and be obtained after system initialization, and receiving terminal node network state parameters value can obtain according to terminal equipment build-in attribute.Communication system total energy consumption comprises transmitting power P _twith processing of circuit energy consumption P _ct, calculate according to formula (1).

P _total＝P _t+P _ct(1)

In addition, P _tsrepresent the processing of circuit energy consumption needed for transmitting terminal node transmitting information, P _tcrepresent the processing of circuit energy consumption needed for node reception information.In direct mode, under the transmitting power of sender node and opportunistic cooperation transmission means, the transmitting power of via node can be calculated by formula (2) and (3).

P _ts＝P _total-P _ct(2)

P _tc＝P _total-(2M-1)P _ct-P _t(3)

Wherein M represents the via node number being in active state.

On formula (1), (2) and (3) basis, when each channel is separate and white Gaussian noise variance is consistent, the signal to noise ratio of receiving terminal can be calculated by formula (4).

$\left\{\begin{array}{c}\mathrm{SNR}=f\left({\left|h_i\right|}^2\right)\\ f\left(x\right)=\frac{E_0}{N_0*d_l^l}\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}S{l}_i[P_{\mathrm{total}}-(2M-1)P_{\mathrm{ct}}]x\end{array}\right.---\left(4\right)$

Wherein, N ₀represent white Gaussian noise variance, E ₀represent and send signal energy, d _lrepresent the distance between sender node and receiving terminal node, l represents channel fading index.

Define the communication performance that outage probability represents receiving terminal node in the present invention, can be calculated by formula (5).

P _out＝P(SNR＜α)＝1-SNR/α (5)

Wherein α is wireless link outage threshold, obtains by actual measurement statistics.

Bit error rate P is defined in the present invention _brepresent in the digital signal that receiving terminal node receives and the bit number of mistake and the ratio of total bit number occur, can be calculated by formula (6).

$P_b=\frac{1}{2}{e}^{f\left({\left|h_i\right|}^2\right)\mathrm{\&gamma;}}---\left(6\right)$

Wherein, γ is the receiving terminal node equipment mistake factor, is determined by device interior noise and data transmission rate.

Refer to Fig. 2, according to formula (4) cooperative node number M Changing Pattern is affected on signal to noise ratio snr, obtain P _ctwith P _totalthe threshold alpha of ratio ₁and β ₁, specific as follows:

(1) P is worked as _ct/ P _totalduring <0.1, signal to noise ratio snr increases gradually along with enlivening increasing progressively of cooperative node number M, now significantly can improve communication system performance by increasing via node number in opportunistic cooperation.

(2) 0.01<P is worked as _ct/ P _totalduring <0.4, signal to noise ratio snr is along with enlivening increasing progressively first to increase gradually and then reducing of cooperative node number M, and now cooperation transmission needs to choose most suitable cooperative node number M and just can reach optimal transmission effect.

(3) P is worked as _ct/ P _totalduring >0.4, signal to noise ratio snr reduces along with increasing progressively of cooperative node M, now selects direct mode.

Herein, α ₁get 0.4, β ₁get 0.1.

Refer to Fig. 3, according to formula (4) channel status h _ito the Changing Pattern of signal to noise ratio snr, obtain P _ctwith P _totalthe threshold alpha of ratio ₂, specific as follows:

(1) when enlivening cooperative node number M, processing of circuit energy consumption one timing, the better signal to noise ratio snr of channel status is higher.

(2) when enlivening cooperative node number M, channel status one timing, more low signal-to-noise ratio SNR is higher for processing of circuit energy consumption;

(3) when channel status one timing, point following two kinds of situation discussion:

A () is as processing of circuit energy consumption and system total power ratio and P _ct/ P _totalthe signal to noise ratio snr directly transmitted during >0.4 is higher, now adopts and directly transmits.

B () is as processing of circuit energy consumption and system total power ratio and P _ct/ P _totalduring <=0.4, along with the signal to noise ratio snr of the more and more less opportunistic cooperation of ratio is higher, now adopt opportunistic cooperation transmission.

Herein, α ₂get 0.4.

In like manner, consult Figure 4 and 5, find that outage probability and bit error rate have and channel status h _iidentical rule, threshold alpha ₃and α ₄all get 0.4.Therefore, can adopt directly transmission or opportunistic cooperation transmission according to bit error rate, outage probability, signal to noise ratio, cooperative node number and channel status analysis decision, chance decision-making module as shown in Figure 1 completes.

Then, in the present invention, each receiving terminal node link layer adopts ARQ mechanism, throughput S _aRQfor successfully sending the pay(useful) load of packet and the ratio always transmitting data, can be calculated by formula (7).

$\left\{\begin{array}{c}{S}_{\mathrm{ARQ}}=\frac{l_{\mathrm{payload}}}{l_{\mathrm{DATA}}+l_{\mathrm{ACK}}}g(h_i,N_{\max })\\ g(h_i,N_{\max })=(1-(1-(1-\frac{1}{2}{e}^{f\left({\left|h_i\right|}^2\right)\frac{B_N}{2R_{\mathrm{radio}}}})l_{\mathrm{DATA}})N_{\max }+1)\end{array}\right.---\left(7\right)$

Wherein, N _maxrepresent maximum retransmission, l _payloadrepresent payload length, the ACK bag in reponse system is long is designated as l _aCK, l herein _dATAand l _aCKvalue can according to mobile terminal device build-in attribute and adopt communication protocol to obtain.

Packet loss P _aRQfor there is the number-of-packet of mistake and the ratio always sending number-of-packet in communication process in the unit time, can be calculated by formula (8).

$\left\{\begin{array}{c}{P}_{\mathrm{ARQ}}=h(h_i,N_{\max })\\ h(h_i,N_{\max })=(1-(1-(1-\frac{1}{2}{e}^{f\left({\left|h_i\right|}^2\right)\frac{B_N}{2R_{\mathrm{radio}}}})l_{\mathrm{DATA}})N_{\max }+1)\end{array}\right.---\left(8\right)$

End-to-end average RTT T _aRQfor packet is issued to the average time receiving ACK bag from sender node, can be calculated by formula (9).

$T_{\mathrm{ARQ}}=T\frac{1-h{(h_i,N_{\max })}^{N_{\max }+1}}{1-h(h_i,N_{\max })}---\left(9\right)$

Based on reliability analysis system efficiency η _aRQcan be calculated by formula (10).

${\mathrm{\&eta;}}_{\mathrm{ARQ}}=\frac{E_{\mathrm{effi}}}{E_{\mathrm{total}}}(1-P_{\mathrm{ARQ}})=\frac{l_{\mathrm{payload}}}{l_{\mathrm{DATA}}+l_{\mathrm{ACK}}}(l-h(h_i,N_{\max }))---\left(10\right)$

Consult Fig. 6,7,8,9 and 10, when can find out that channel status is good, by increasing maximum retransmission N _maxobviously can reduce packet loss, even and if channel status is poor time repeatedly retransmit and also cannot improve, now initiatively should abandon bag.Consult Figure 11,12,13 and 14, when finding that cooperative node number M fixes, processing of circuit energy consumption P _ctlower then system throughput S _aRQlarger, work as P _ctafter increasing, throughput reduces on the contrary; P _cttime fixing, cooperative node number M gets over Iarge-scale system throughput S _aRQlarger.Consult Figure 15,16,17 and 18, find different cooperative node number M and P _ctwith P _totalin ratio situation, maximum retransmission N _maxincrease different to its performance impact rule, not retransmit more multisystem throughput S _aRQlarger.Should calculate according to analytical model the alternation relation that its number of retransmissions affects throughput, best maximum retransmission N is set accordingly _maxvalue, this alternation relation is specific as follows:

(1) as M=1 and P _ct/ P _totalwhen=0.1, N _maxwhen being 2, throughput is maximum, N _maxbeing 1 to take second place, is then N _maxbe 3, the poorest is N _maxequal 4;

(2) as M=1 and P _ct/ P _totalwhen=0.3, N _maxwhen being 4, throughput is maximum, N _maxbeing 3 to take second place, is then N _maxbe 1, the poorest is N _maxequal 2;

(3) as M=2 and P _ct/ P _totalwhen=0.1, N _maxwhen being 1, throughput is maximum, N _maxbeing 4 to take second place, is then N _maxbe 2, the poorest is N _maxequal 3;

(4) as M=2 and P _ct/ P _totalwhen=0.3, N _maxwhen being 3, throughput is maximum, N _maxbeing 4 to take second place, is then N _maxbe 2, the poorest is N _maxequal 1.

Consult Figure 19, find N _maxtime fixing, the more and P of cooperative node _ctwith P _totalratio larger then average RTT T _aRQlarger, according to this by reducing cooperative node number or reducing P _ctwith P _totalratio effectively shortens time delay, improves real-time.

Consult Figure 20,21,22 and 23, can draw the following conclusions:

(1) N _maxmore long time delay is larger;

(2) P _ctwith P _totalwhen ratio is fixed, more multi-time Delay is larger for cooperative node;

(3) when cooperative node is few and P _ctwith P _totalratio hour, the improvement of channel status contributes to shortening time delay, N _maxalong with the raising of channel quality time fixing, in time, postpones a meeting or conference and progressively reduces, and the amplitude of reduction is along with P _ctwith P _totalthe increase of ratio and reducing;

(4) the many or P of cooperative node _ctwith P _totalwhen ratio is larger, average RTT is insensitive to channel status, even if time delay remains maximum under the state that quality is higher.

Consult Figure 24, find N _maxp time fixing _ctwith P _totalthe larger then efficiency η of ratio _aRQlower, P _ctwith P _totalthe less then efficiency of ratio is higher; P _ctwith P _totalwhen ratio is fixed, cooperative node is efficiency η more at most _aRQhigher.This conclusion shows: can by increasing cooperative node or reducing P _ctwith P _totalratio, effectively reduces system energy efficiency.

Consult Figure 25,26,27 and 28, no matter find M and P _ct/ P _totalhow to arrange, all by increasing N _maximprove system energy efficiency.

In sum, can according to M, P _ct/ P _totaland N _maxthree parameters set up single performance or many performance synthesises opportunistic cooperation guarantee plan in conjunction with the sensitivity of user to time delay, throughput, efficiency and packet loss, specifically as shown in table 1.

Protocol Numbers	Supportability	M	P ct/P total	N max	Responsive performance	Head type is encoded
							1	Real-time is best	1	0.1	1	1	001
2	Reliability is the strongest	2	0.3、0.4	4	6	010
							3	Throughput is maximum	2	0.1	1	2	011
4	Efficiency is the highest	2	0.1	4	3	100
							5	Half-way house one	2	0.3	2	5	101
6	Half-way house two	2	0.1	2	4	110

Transmission policy table in table 1 six opportunistic cooperation transmission plans

Wherein, half-way house one is for main compatible real-time, throughput and efficiency with reliability.Half-way house two is for main compatible reliability, throughput and efficiency with real-time.Sender node and via node can set up best cooperation transmission scheme according to the real-time opportunistic of mentioned above principle self adaptation.

Receiving terminal node will receive the composite signal sent from sender node and multiple cooperative node, need be undertaken its process by isomorphism signal multiplexer, in order to solve noise jamming, the problem such as delay distortion and distortion that signal multiplexing brings, 12 frequency division QPSK modulation principles shown in Figure 29 can be consulted, consulting flow process shown in Figure 30 adopts circuit shown in Figure 31 to implement signal madulation, as shown in figure 32, implementation step is specific as follows for an Applied D emonstration:

S01, sender node are in conjunction with network state, node state and the user QoS requirements of support, killer opportunity cooperation scheme 001 is selected from table 1, by head form " 001 " input 74LS90, which kind of cooperation scheme laggard row 6 frequency division of a judgement employing then external 74LS74 carries out 2 frequency divisions again, thus after realizing 12 frequency divisions, signal is sent in network, if the NAK received from via node wraps, carry out signal re-transmission;

S02, via node receive from after sender node signal, from table 1, killer opportunity cooperation scheme 010 is selected with reference to S01 operation, head form " 010 " input 74LS90, which kind of cooperation scheme laggard row 6 frequency division of a judgement employing then external 74LS74 carries out 2 frequency divisions again, thus after realizing 12 frequency divisions, signal is sent in network, if the NAK received from receiving terminal node wraps, carry out signal re-transmission, number of retransmissions exceedes the N of cooperation scheme _maxin time, wraps to sender node transmission NAK;

S03, receiving terminal node can find the signal receiving 2 kinds of different QoS guarantee plans after cooperation part Format Type decoding on the desk by analytical engine, are respectively 001 and 010, pass through according to after 12 frequency division QPSK demodulation after obtain useful signal, carry out CRC check, the data errorless ACK of returning bag otherwise return NAK bag, if head Format Type is not directly one of transmission or six cooperation schemes, directly packet discard returns NAK bag.

When sending signal by sender node directly to receiving terminal node, head form is " 000 ", receiving terminal node decoding head type is defined as directly transmission then directly to carry out demodulating and decoding and ignores other node signals, and other detailed processes are same as the prior art, are not repeated at this.

The present invention is by real-time perception Internet of Things, wireless sensor network or wireless self-organization network state, sender node and relaying mobile device node state, real-time perception channel status and the QoS requirements of support, build and there are opportunistic cooperation QoS guarantee plan and 12 frequency division QPSK principles of modulation and demodulation and the implementing circuits thereof of single performance or many performance synthesises formula, thus meet diversity in reliability, real-time, sustainability and operating efficiency etc. of Mobile solution in heterogeneous networks framework and the dynamic requirements of support.

Claims (5)

1., based on a division modulation type opportunistic cooperation QoS assurance for channel status perception, it is characterized in that, comprise the following steps:

S01, sender node are by P _ct/ P _totalcompared with threshold value, if P _ct/ P _totalbe greater than threshold value, then adopt direct mode to enter S04, if P to the zero setting of signal data start bit _ct/ P _totalbe less than or equal to threshold value, enter S02;

S02, by cooperative node number M, channel status h _i, P _ct/ P _totalwith the maximum retransmission N of link layer ARQ _maxto throughput S _aRQ, packet loss P _aRQ, average RTT T _aRQwith efficiency η _aRQchanging Pattern set up six opportunistic cooperation control programs, and to six opportunistic cooperation control programs coding, each Cooperation controlling scheme determines one group of cooperative node number M and maximum retransmission N _max;

S03, sender node are selected an opportunistic cooperation control program and corresponding scheme code are added signal data start bit, then carry out 12 frequency division type QPSK to signal data and modulate;

Send signal data after S04, interpolation cyclic redundancy check (CRC) code, intercept channel, if the NAK received from via node wraps, then according to the maximum retransmission N that the opportunistic cooperation control program selected in S03 is determined simultaneously _maxcarry out signal data re-transmission, otherwise continue to send signal data;

S05, M via node is selected an opportunistic cooperation control program respectively and corresponding scheme code is added signal data start bit, then carries out 12 frequency division type QPSK to signal data and modulates;

Signal data is sent after S06, interpolation cyclic redundancy check (CRC) code, intercept channel simultaneously, if the ACK received from receiving terminal node wraps, continue to send signal data, if the NAK received from receiving terminal node wraps, then according to the maximum retransmission N that the opportunistic cooperation control program selected in S05 is determined _maxcarry out signal data re-transmission;

S07, via node carry out signal data number of retransmissions and are greater than maximum retransmission N in S06 _maxin time, wraps to sender node transmission NAK;

S08, receiving terminal node judge the start bit of the signal data bag received, if directly transmission is then to the direct demodulating and decoding of signal data bag, if opportunistic cooperation control program coding then carries out 12 frequency division type QPSK demodulating and decodings, all the other situations abandon signal data bag and feed back NAK bag;

S09, execution CRC check, reach upper strata and send ACK bag by feedback channel simultaneously, otherwise feed back NAK bag after initiatively abandoning signal data bag after confirmation signal packet is errorless.

2. the division modulation type opportunistic cooperation QoS assurance based on channel status perception according to claim 1, is characterized in that: described threshold value is affecting laws threshold value, the channel status h of cooperative node number M to signal to noise ratio snr _ito affecting laws threshold value, the channel status h of signal to noise ratio snr _ito interruption probability P _outaffecting laws threshold value and channel status h _ito error rate P _baffecting laws threshold value in maximum.

3. the division modulation type opportunistic cooperation QoS assurance based on channel status perception according to claim 1, is characterized in that: described cooperative node number M is to the affecting laws threshold value of signal to noise ratio snr and channel status h _ito the affecting laws threshold value of signal to noise ratio snr by formula $\left\{\begin{array}{c}\mathrm{SNR}=f\left({\left|h_i\right|}^2\right)\\ f\left(x\right)=\frac{E_0}{N_0*d_l^l}\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{\mathrm{Sl}}_i[P_{\mathrm{total}}-(2M-1)P_{\mathrm{ct}}]x\end{array}\right.$ Obtain, described channel status h _ito interruption probability P _outaffecting laws threshold value by formula $\left\{\begin{array}{c}\mathrm{SNR}=f\left({\left|h_i\right|}^2\right)\\ f\left(x\right)=\frac{E_0}{N_0*d_l^l}\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{\mathrm{Sl}}_i[P_{\mathrm{total}}-(2M-1)P_{\mathrm{ct}}]x\end{array}\right.$ And P _out=P (SNR < α)=1-SNR/ α obtains, described channel status h _ito error rate P _baffecting laws threshold value by formula $\left\{\begin{array}{c}\mathrm{SNR}=f\left({\left|h_i\right|}^2\right)\\ f\left(x\right)=\frac{E_0}{N_0*d_l^l}\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{\mathrm{Sl}}_i[P_{\mathrm{total}}-(2M-1)P_{\mathrm{ct}}]x\end{array}\right.$ With $P_b=\frac{1}{2}{e}^{f\left({\left|h_i\right|}^2\right)\mathrm{\&gamma;}}$ Obtain.

4. the division modulation type opportunistic cooperation QoS assurance based on channel status perception according to claim 1, is characterized in that: described cooperative node number M, channel status h _i, P _ct/ P _totalwith the maximum retransmission N of link layer ARQ _maxto throughput S _aRQ, packet loss P _aRQ, average RTT T _aRQwith efficiency η _aRQchanging Pattern by formula

$\left\{\begin{array}{c}{S}_{\mathrm{ARQ}}=\frac{l_{\mathrm{payload}}}{l_{\mathrm{DATA}}+l_{\mathrm{ACK}}}g(h_i,N_{\max })\\ g(h_i,N_{\max })=(1-{(1-{(1-\frac{1}{2}{e}^{f\left({\left|h_i\right|}^2\right)\frac{B_N}{2R_{\mathrm{radio}}}})}^{l_{\mathrm{DATA}}})}^{N_{\max }+1})\end{array}\right.,\left\{\begin{array}{c}{P}_{\mathrm{ARQ}}=h(h_i,N_{\max })\\ h(h_i,N_{\max })={(1-{(1-\frac{1}{2}{e}^{f\left({\left|h_i\right|}^2\right)\frac{B_N}{2R_{\mathrm{radio}}}})}^{l_{\mathrm{DATA}}})}^{N_{\max }+1}\end{array}\right.,$ $T_{\mathrm{ARQ}}=T\frac{1-h{(h_i,N_{\max })}^{N_{\max }+1}}{1-h(h_i,N_{\max })}$ With ${\mathrm{\&eta;}}_{\mathrm{ARQ}}=\frac{E_{\mathrm{effi}}}{E_{\mathrm{total}}}(1-P_{\mathrm{ARQ}})=\frac{l_{\mathrm{payload}}}{l_{\mathrm{DATA}}+l_{\mathrm{ACK}}}(1-h(h_i,N_{\max }))$ Determine.

5. the division modulation type opportunistic cooperation QoS assurance based on channel status perception according to claim 1, is characterized in that: described six opportunistic cooperation control programs coding is respectively 001,010,011,100,101 and 110.