CN102724154A - Adaptive relay transmission method of multi-hop wireless communication system - Google Patents
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Abstract
The invention provides an adaptive relay transmission method which is suitable for a multi-hop wireless communication system. Each node selects and adopts a relay transmission mode according to confidence measurement of symbol demodulation of an ancestor node and the node and selects a modulation coding mode according to channel state information of a lower node and the node. By using a current multi-hop wireless communication system, a single relay forwarding transmission technology is used so that link feasibility and a transmission time delay requirement can not be considered simultaneously under the condition of an application scene with lots of hop counts (such as dozens of hops).
Description
Technical field
The present invention relates to each internodal low time delay reliable transmission scheme of a kind of multi-hop wireless communication system, can be used for belonging to wireless communication field based on the center being arranged or not having the broadband wireless multi-hop relay network that the center is controlled.
Background technology
The network of wireless system generally adopts frameworks such as single-hop networks and multihop network.Single-hop networks general networking capacity is bigger, but owing to be subject to base station transmitting power, within general several kilometers of the network coverage; Distance between each node of multi-hop wireless network is shorter relatively; Each jumping can be accomplished the message transmission rate more much higher than direct communication; Make in the end-to-end communication system of long distance and can support high data rate equally; And along with the increase of network node, the coverage of network and flexibility also can increase thereupon, have solved the limited problem of single-hop networks coverage to a certain extent.
For multi-hop wireless network, realize the link reliability of the relay transmission of data forwarding between node and two important performance index that propagation delay time is system.Relay transmission technology commonly used at present has to amplify transmits (AF), and (DMF) transmitted in demodulation and (DCF) three kinds of methods are transmitted in decoding.In the AF method, node only amplifies the back to the signal that receives directly to be transmitted, and it is minimum that this method is transmitted time delay, and the single-link reliability is the poorest; In the DMF method, node needs the signal of reception is carried out the constellation demodulation, and then transmit constellation modulation back again, and this method can promote link transmission performance, but because the mediation modulation treatment is separated in introducing, data forwarding latency is bigger than AF method; In the DCF method; Node needs the signal that receives is carried out demodulation, decoding and judgement; Then the information bit recompile of judgement is transmitted with the modulation back; This method can obtain best link reliability, but owing to introduce demodulate/decode and code modulated processing time, so the data forwarding latency of this method is also maximum.
In multi-hop wireless network, the end-to-end propagation delay time of data in network adds up for each internodal propagation delay time.When the multi-hop wireless network jumping figure more for a long time, must guarantee under the condition of link reliability to the in addition strict control of each internodal propagation delay time, so that network can be supported real time business such as speech and video.
The wireless communication system of supporting multi-hop at present is (like WiFi, WiMAX (802.16d; 802.16j), 3GPP-LTE etc.); Because being primarily aimed at number jumps with interior application scenarios; The application (like tens of jumpings) more to jumping figure is not optimized design, therefore is difficult in the multi-hop transmission is used, satisfy simultaneously the requirement of link feasibility and propagation delay time.
Summary of the invention
In order to solve the problems of the technologies described above, the present invention proposes a kind of self adaptation relay transmission method, comprise the steps:
1) via node is received the wireless signal from its superior node, carries out symbol demodulation;
2) according to the channel condition information of this via node and its superior node, the confidence of compute sign demodulation is measured;
3) confirm relay transmission mode according to the confidence tolerance of the demodulation symbol of this via node;
When 4) data after this via node is with demodulation are directly modulated the back forwarding again, can upgrade modulation system according to the channel quality of this via node and its next stage node;
5) the data relay transmission of the modulation system after adopt upgrading after with demodulation is to the next stage node.
According to certain embodiment of the present invention, adopting the modulation system after upgrading data to be carried out in the process of relay transmission, the data mode that via node is transmitted transmission to modulation identifies.
According to certain embodiment of the present invention; Modulation system after adopting renewal is carried out in the process of relay transmission to data; The hop count sign of the data symbol of receiving when the relaying node directly adopts the pass-through mode of decoding during greater than a certain preset threshold value, forwards the data to the next stage node.
According to certain embodiment of the present invention; Data after the relaying node is with demodulation are directly modulation back forwarding again; And receive modulation system and transmit modulation system not simultaneously; Under this via node demodulated data bit length data bit length condition of different required, carry out the data bit length matching treatment with transmitting modulation.
According to certain embodiment of the present invention, said channel condition information according to this via node and its superior node, the confidence tolerance of compute sign demodulation is to calculate according to following mode:
A) confidence of symbol demodulation tolerance is made as the function of received signal to noise ratio (SNR), or
B) confidence of symbol demodulation tolerance is made as the function that receives Signal to Interference plus Noise Ratio (SINR), or
C) confidence of symbol demodulation tolerance is made as the function that receives effective Signal to Interference plus Noise Ratio (eSINR), or
D) confidence of symbol demodulation tolerance is made as to receive and carries dried making an uproar than the function of (CINR), or
E) confidence of symbol demodulation tolerance is made as the function of the soft information of demodulation.
According to certain embodiment of the present invention, said definite relay transmission mode is to confirm according to following mode:
F) if self-confident tolerance is greater than or equal to a certain setup parameter, then the data after this node demodulation is modulated the back again and transmit;
G) if self-confident tolerance is lower than a certain setup parameter, then the data after this node demodulation is further decoded, and carry out CRC check;
I. if CRC check is correct, then with the data recompile, transmit the modulation back;
Ii. if CRC check is incorrect, then data are abandoned.
According to certain embodiment of the present invention, upgrading modulation system is to upgrade according to following mode:
H) when this via node modulation system identical with receiving symbol with the channel quality support of its next stage node, then that the The data after this via node demodulation is identical with receiving symbol modulation system is modulated the back again and is transmitted;
● when the channel quality support of this via node and its next stage node, then is modulated into the data after this via node demodulation than transmits after the higher modulation system of receiving symbol order of modulation more during high-order modulating than receiving symbol again;
I) only support more during the low-order-modulated mode, then the data after this via node demodulation to be modulated into than to be transmitted after the lower modulation system of receiving symbol order of modulation again when this via node and the channel quality of its next stage node than receiving symbol;
J) when the channel quality of this via node and its next stage node is worse than the channel quality of this via node and its even higher level of node; Can the The data modulation system identical with receiving symbol after this via node demodulation be modulated again; Pass through different time after then modulation symbol being duplicated many parts; Frequency and space resources are forwarded to the next stage node.
According to certain embodiment of the present invention,, the said data mode of transmitting transmission is identified according to following mode identifies:
When k) The data after the relaying node is with demodulation is directly modulated the back forwarding, forwarding of data number of times sign is transmitted in direct modulation carried out mark, revolution is sent out once, and the hop count sign adds 1;
When l) transmitted the decoding of the The data after the relaying node is with demodulation back, the hop count sign was changed to 0.According to certain embodiment of the present invention, said data bit length matching treatment realizes according to following mode:
M) calculate the via node demodulated data bit length data bit length difference Np required with transmitting modulation;
N) data bit after the demodulation is added Np filling bit, it is satisfied transmit the required data bit length requirement of modulation.
The invention solves in the existing multihop system transmission plan and work as the relaying transmission jump number more for a long time, can not guarantee the reliability of data forwarding and the problem of propagation delay time simultaneously.The present invention can be applicable to: the mobile cellular net, wireless sense network is in the multi-hop wireless communication systems such as Internet of Things.
Description of drawings
Below in conjunction with accompanying drawing and specific embodiment the present invention is remake further detailed explanation.
Fig. 1 is the multi-hop wireless communication system network topology according to the embodiment of the invention;
Fig. 2 is the broadband multi-hop wireless network enforcement figure according to the embodiment of the invention.
Embodiment
Shown in Figure 1 is the multi-hop wireless communication system network topology.According to data transfer direction, each node receives the data from its superior node, and is forwarded to its next stage node.The confidence tolerance of each node basis and the symbol demodulation of its superior node selects to adopt relay transmission mode, according to the channel condition information of its downstream site, select modulation coding mode, to guarantee the link reliability and the propagation delay time performance of multihop network.
Self adaptation relay transmission method is following:
1) via node is received the wireless signal from its superior node, carries out symbol demodulation;
2) according to the channel condition information of this via node and its superior node, the confidence of compute sign demodulation is measured;
3) confirm relay transmission mode according to the confidence tolerance of the demodulation symbol of this via node;
When 4) data after this via node is with demodulation are directly modulated the back forwarding again, can upgrade modulation system according to the channel quality of this via node and its next stage node;
5) the data relay transmission of the modulation system after adopt upgrading after with demodulation is to the next stage node.
Adopting the modulation system after upgrading data to be carried out in the process of relay transmission, the data mode that via node is transmitted transmission to modulation identifies.
Modulation system after adopt upgrading is carried out data in the process of relay transmission, and the hop count sign of the data symbol of receiving when the relaying node directly adopts the pass-through mode of decoding during greater than a certain preset threshold value, forwards the data to the next stage node.
Data after the relaying node is with demodulation are directly modulation back forwarding again; And receive modulation system and transmit modulation system not simultaneously; Under this via node demodulated data bit length data bit length condition of different required, carry out the data bit length matching treatment with transmitting modulation.
In step 2) in, said channel condition information according to this via node and its superior node, the confidence tolerance of compute sign demodulation can be calculated according to following mode:
A) confidence of symbol demodulation tolerance is made as the function of received signal to noise ratio (SNR), or
B) confidence of symbol demodulation tolerance is made as the function that receives Signal to Interference plus Noise Ratio (SINR), or
C) confidence of symbol demodulation tolerance is made as the function that receives effective Signal to Interference plus Noise Ratio (eSINR), or
D) confidence of symbol demodulation tolerance is made as to receive and carries dried making an uproar than the function of (CINR), or
E) confidence of symbol demodulation tolerance is made as the function of the soft information of demodulation.
In step 3), said definite relay transmission mode is to confirm according to following mode:
F) if self-confident tolerance is greater than or equal to a certain setup parameter, then the data after this via node demodulation is modulated the back again and transmit;
G) if self-confident tolerance is lower than a certain setup parameter, then the data after this via node demodulation is further decoded, and carry out CRC check;
I. if CRC check is correct, then with the data recompile, transmit the modulation back;
Ii. if CRC check is incorrect, then data are abandoned.
In step 4), upgrading modulation system is to upgrade according to following mode:
A), then the data after this via node demodulation are modulated into than are transmitted after the higher modulation system of receiving symbol order of modulation again more during high-order modulating than receiving symbol when the channel quality support of this via node and its next stage node;
B) when this via node modulation system identical with receiving symbol with the channel quality support of its next stage node, then that the The data after this via node demodulation is identical with receiving symbol modulation system is modulated the back again and is transmitted;
C) only support more during the low-order-modulated mode, then the data after this via node demodulation to be modulated into than to be transmitted after the lower modulation system of receiving symbol order of modulation again when this via node and the channel quality of its next stage node than receiving symbol;
D) when the channel quality of this via node and its next stage node is worse than the channel quality of this node and its even higher level of node; Can the The data modulation system identical with receiving symbol after this via node demodulation be modulated again; Pass through different time after then modulation symbol being duplicated many parts; Frequency and space resources are forwarded to the next stage node;
In data bit length matching treatment process, carry out the data bit length matching treatment according to following mode:
A) calculate the via node demodulated data bit length data bit length difference Np required with transmitting modulation;
B) data bit after the demodulation is added Np filling bit, it is satisfied transmit the required data bit length requirement of modulation.
In the process that the data mode that forwarding is transmitted identifies, the data mode of transmitting transmission is identified according to following mode:
When a) The data after the relaying node is with demodulation is directly modulated the back forwarding, forwarding of data number of times sign is transmitted in direct modulation carried out mark, revolution is sent out once, and the hop count sign adds 1;
When b) transmitted the decoding of the The data after the relaying node is with demodulation back, the hop count sign was changed to 0;
C) hop count sign adopts the decoding pass-through mode, and with transmit the data independent transmission.
Fig. 2 is a kind of broadband multi-hop wireless network example, and data are sent by node 1, transmits through node 2 to node 5, transfers to node 6.CINRm-n representes that node m receives year dried making an uproar than (CINR) to the link between the node n.The confidence tolerance of the symbol demodulation of each node is made as to receive carries dried making an uproar than (CINR).CINR is defined as:
Wherein, n the data symbol of r [n] for receiving, n the data symbol of s [n] for detecting after the demodulation, N are that CINR estimates used sample points.
The modulation system of supposing the system support is arranged as M1 from low to high by spectrum efficiency, M2, and M3, code efficiency (abbreviation code check) is by being arranged as C1 from low to high, C2, C3.
Adopt demodulation to transmit when then data are sent by node 2, its modulation system and code check are M1C1;
Adopt decoding to transmit when then data are sent by node 3, its modulation system and code check are M3C2;
supposes that the confidence tolerance CINR3-4 that node 4 receives is higher than set thresholding, and node 4 supports that to the channel quality between the node 5 modulation system and code check are M3C2;
Adopt demodulation to transmit when then data are sent by node 4, its modulation system and code check are M3C2;
Adopt demodulation to transmit when then data are sent by node 5, its modulation system and code check are M2C2.
Said thresholding can be set the requirement of channel according to different modulating mode and code check.
In sum, though the present invention with the preferred embodiment disclosure as above, yet it is not in order to limit the present invention.The those of ordinary skill of technical field is not breaking away from the spirit and scope of the present invention under the present invention, can do various changes and modification.Therefore, protection scope of the present invention is as the criterion when looking the scope that accompanying Claim defines.
Claims (9)
1. a self adaptation relay transmission method is characterized in that, comprises the steps:
A. via node is received the wireless signal from its superior node, carries out symbol demodulation;
B. according to the channel condition information of this via node and its superior node, the confidence of compute sign demodulation is measured;
C. confirm relay transmission mode according to the confidence tolerance of the demodulation symbol of this via node;
When D. the data after this via node is with demodulation are directly modulated the back forwarding again, according to the channel quality renewal modulation system of this via node and its next stage node;
E. the data relay transmission of the modulation system after adopt upgrading after with demodulation is to the next stage node.
2. like the self adaptation relay transmission method in the claim 1, it is characterized in that:
Adopting the modulation system after upgrading data to be carried out in the process of relay transmission, the data mode that via node is transmitted transmission to modulation identifies.
3. like the self adaptation relay transmission method in the claim 2, it is characterized in that:
Modulation system after adopt upgrading is carried out data in the process of relay transmission, and the hop count sign of the data symbol of receiving when the relaying node directly adopts the pass-through mode of decoding during greater than a certain preset threshold value, forwards the data to the next stage node.
4. like the self adaptation relay transmission method in the claim 1, it is characterized in that:
Data after the relaying node is with demodulation are directly modulation back forwarding again; And receive modulation system and transmit modulation system not simultaneously; Under this via node demodulated data bit length data bit length condition of different required, carry out the data bit length matching treatment with transmitting modulation.
5. according to the method in the claim 1, it is characterized in that: said channel condition information according to this via node and its superior node, the confidence tolerance of compute sign demodulation is to calculate according to following mode:
A) confidence of symbol demodulation tolerance is made as the function of received signal to noise ratio (SNR), or
B) confidence of symbol demodulation tolerance is made as the function that receives Signal to Interference plus Noise Ratio (SINR), or
C) confidence of symbol demodulation tolerance is made as the function that receives effective Signal to Interference plus Noise Ratio (eSINR), or
D) confidence of symbol demodulation tolerance is made as to receive and carries dried making an uproar than the function of (CINR), or
E) confidence of symbol demodulation tolerance is made as the function of the soft information of demodulation.
6. according to the method in the claim 1, it is characterized in that: confirm that relay transmission mode is to confirm according to following mode:
F) if self-confident tolerance is greater than or equal to a certain setup parameter, then the data after this via node demodulation is modulated the back again and transmit;
G) if self-confident tolerance is lower than a certain setup parameter, then with the data after this via node demodulation, further decoding, and carry out CRC check;
I. if CRC check is correct, then with the data recompile, transmit the modulation back;
Ii. if CRC check is incorrect, then data are abandoned.
7. according to the method in the claim 1, it is characterized in that upgrading modulation system is to upgrade according to following mode:
H), then the data after this via node demodulation are modulated into than are transmitted after the higher modulation system of receiving symbol order of modulation again more during high-order modulating than receiving symbol when the channel quality support of this via node and its next stage node;
I) when this via node modulation system identical with receiving symbol with the channel quality support of its next stage node, then that the The data after this via node demodulation is identical with receiving symbol modulation system is modulated the back again and is transmitted;
J) only support more during the low-order-modulated mode, then the data after this via node demodulation to be modulated into than to be transmitted after the lower modulation system of receiving symbol order of modulation again when this via node and the channel quality of its next stage node than receiving symbol;
K) when the channel quality of this via node and its next stage node is worse than the channel quality of this via node and its even higher level of node; Can the The data modulation system identical with receiving symbol after this via node demodulation be modulated again; Pass through different time after then modulation symbol being duplicated many parts; Frequency and space resources are forwarded to the next stage node.
8. according to the method in the claim 1, it is characterized in that, the data mode of transmitting transmission is identified according to following mode identify:
When l) The data after the relaying node is with demodulation is directly modulated the back forwarding, forwarding of data number of times sign is transmitted in direct modulation carried out mark, revolution is sent out once, and the hop count sign adds 1;
When m) transmitted the decoding of the The data after the relaying node is with demodulation back, the hop count sign was changed to 0;
N) hop count sign adopts the decoding pass-through mode, and with transmit the data independent transmission.
9. according to the method in the claim 1; It is characterized in that; Data after the relaying node is with demodulation are directly modulation back forwarding again; And receive modulation system and transmit modulation system not simultaneously, under this via node demodulated data bit length data bit length condition of different required, carry out the data bit length matching treatment according to following mode with transmitting modulation;
O) calculate the via node demodulated data bit length data bit length difference Np required with transmitting modulation;
P) data bit after the demodulation is added Np filling bit, it is satisfied transmit the required data bit length requirement of modulation.
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