CN101828419A - Method and system for resisting interference and enlarging network capability in wireless multi-hop networks - Google Patents
Method and system for resisting interference and enlarging network capability in wireless multi-hop networks Download PDFInfo
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- CN101828419A CN101828419A CN200880013246A CN200880013246A CN101828419A CN 101828419 A CN101828419 A CN 101828419A CN 200880013246 A CN200880013246 A CN 200880013246A CN 200880013246 A CN200880013246 A CN 200880013246A CN 101828419 A CN101828419 A CN 101828419A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
- H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
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Abstract
The invention is concerned with a method and system for reducing communication interference in wireless networks. The method of the invention includes: detecting multiple neighbor nodes of a center node; sending a first communication signal to the multiple neighbor nodes and the first communication signal is only transmitted to the nodes which are regarded as the neighbors by the center node; when the data is transferred between the center node and one of the neighbor nodes, the others of the neighbor nodes will not transmit any data in the same channel according to the first communication signal so that the communication interference in the wireless network would be reduced.
Description
A kind of method and system technical field of resisting interference and enlarging network capability in wireless multi-hop networks
The present invention relates to a kind of wireless communications method and system, specifically, it is a kind of method and system of resisting interference and enlarging network capability in wireless multi-hop networks, belongs to wireless communication technology field.
Background technology
Shared network is jumped different from one, the wireless channel of multihop network is shared broadcast channel.In a multihop network, when node sends packet, the only node in its coverage（Referred to as neighbor node）It can receive, and the node outside coverage then perceives the presence less than any communication.This is also exactly the advantage place of multihop network, i.e., the node outside sending node coverage is not influenceed by sending node, and can send packet simultaneously.
In the prior art, it is exactly that packet collisions are related to the location of node that what the shared broadcast channel of multi-hop was brought, which directly affects,.In a broadcast channel for jumping shared, packet collisions are a clobals.It is to perceive packet collisions if all nodes do not receive correct packet.But multihop network is to use CSMA/CA (csmas/collision detection method）, packet collisions are local event, i.e., other nodes in the packet network that one node is sent, which differ, surely to be received, so that " concealed nodes " problem occurs.
As shown in figure 1, when node C sends grouping information, because node A is not within node C antenna footprint, therefore node A becomes can not receive " concealed nodes " of grouping information.
The known method for solving " concealed nodes ", it is to utilize a sending node before data are sent, first short control message is carried out once with a receiving node to shake hands, for example, the transmission that request sends and allows to send signal (RTS/CTS i.e. Request to Send/Clear to Send) is to implement one of method that short control message is shaken hands.
However, the introducing of request to send/allowed to send, can produce influence to the network capacity of whole system.If allowing to send signal（CTS is Clear to Send) transmit power it is too big, then can notify some by mistake without artis, no artis unnecessary " waiting " is occurred, reduce the network capacity of whole system.But it is another
Aspect, if allowing to send signal（CTS is Clear to Send) transmit power it is too small, then do not reach the effect for notifying adjacent other nodes.Packet is mutually collided, and also results in the network capacity of reduction whole system.Therefore, this technology is needed in ditch messenger（For example, it is allowed to send signal）Transmit power and network capacity between find a rational equilibrium valve.
The content of the invention
The purpose of the present invention, is to overcome deficiency of the prior art, and provides a kind of effective solution for the network capacity for being greatly enhanced whole network.The method and system of the present invention can send a parameter of ditch messenger using regulation and control, to reduce interference and improve network capacity.
In one embodiment of this invention, a sending node（Also referred to as one node）Before data are sent, a ditch messenger is first sent to a receiving node（An also referred to as Centroid）, for example, sending node（That is this node）Can elder generation and receiving node（That is Centroid）Carry out once short control message to shake hands, neighbor node is notified in the way of short message, and it will be received, this ditch messenger can be for for example
RTS/CTS modes（Request to Send/Clear to Send) .
According to the present invention, what Centroid was sent allows to send（CTS is Clear to Send) transmission rate and a transmit power of signal, effectively it can be selected and be controlled, so that in whole network, the interference between effectively elimination neighbor node can be reached, also the capacity of whole network system can be greatly enhanced, so that its wireless multi-hop networks network throughput, anti-interference are all greatly enhanced.
Thereby, the present invention is able to utilize one ditch messenger of transmission, and reduce the issuable interference of adjacent other node institutes, and transmitted in sending node and receiving node in the period of packet, avoid adjacent other nodes from sending packet in same channel, and then reduce the generation of interference hits.
About parameter of the present invention to one ditch messenger of transmission, such as to allowing to send（CTS is Clear to Send) transmission rate and a transmit power of signal, selected and controlled using effective mechanism, and reach around reduction interference, and expand the details of network capacity, details are as follows.
Brief description of the drawings
Fig. 1 is the example of the antenna footprint of each node.
Fig. 2 is the correct scope of the present invention and an example of interference range.
Fig. 3 is the example of the transmission of package signal in one embodiment of the invention.
Fig. 4 is the example of the transmission of ditch messenger in one embodiment of the invention.
Embodiment
According to the present invention, reduce and disturb and expand the parameter implementation that network capacity can pass through regulation and control transmission ditch messenger.As shown in figure 4, in one embodiment of this invention, node A (i.e. sending node or this node）Need and node 0 (i.e. receiving node or Centroid）Communication, node A can first send a ditch messenger in a such as sounding channel, and such as one request is sent（RTS is Request to Send) signal, if node 0 is free idle channel, node 0 sends a corresponding ditch messenger in sounding channel, and such as one allows to send（CTS is Clear to Send) signal, to notify node A to carry out data transmission.In a preferred embodiment, (the i.e. Centroid of node 0）Adjacent around node B, C, D (i.e. neighbor node can be more notified simultaneously）, during node A and the data transfer of node 0, data should not be sent in same channel, to avoid collision.
In one embodiment of this invention, the parameter for sending ditch messenger can be a transmission rate.As shown in Fig. 2 the range of transmission of ditch messenger correctly can receive scope and an interference range comprising one.In one embodiment, the correct scope that receives may be defined as the limit value that signal to noise ratio (SNR i.e. signal-to-noise ratio) is more than correct demodulation needs, and interference range may be defined as signal more than noise but less than the limit value of correct demodulation needs.
According to the present invention, in interference range on the premise of minimum, the transmission rate of ditch messenger (for example allowing to send signal) is improved, you can to increase the handling capacity of single-hop.Because speed is heightened, transmission time is short, therefore, within a unit interval, and network utilization is to improve.But, while speed is high, signal to noise ratio（SNR is signal-to-noise ratio) it can also become big, therefore, same transmission range is reached, transmit power also can be improved accordingly, and then it is big to cause interference with scope change.
For example, in intensive small wireless network, wherein all nodes all can cross-reference be within same transmission range, therefore, in the case where speed is high, the big interference range of generation influences less on it, so, intensive small wireless network is adapted to heighten transmission rate, to improve local network capacity.
Another example is lifted, in large-scale wireless network, all nodes are not in same transmission range, therefore, in the case where speed is high, the big interference range of generation influences very big on it, turns down the transmission rate of ditch messenger, can reduce overall interference.So, large-scale wireless network is adapted to turn down transmission rate, to improve the throughput of system of whole wireless network.
According to the present invention, reduction, which is disturbed and expands network capacity, to be implemented using the parameter for sending regulation and control ditch messenger.In another embodiment of the invention, the parameter for sending this ditch messenger can be a transmit power.The key of the transmit power of present invention regulation and control ditch messenger, is to occur to obtain balance between interference hits and system network capacity.When transmit power is too big, ditch messenger can notify some without artis by mistake, so that this node was sent in the period of packet, other nodes are because avoiding occurring interference hits, and stop sending packet, instead result in no artis and unnecessary " waiting " occur, and then reduce the network capacity of whole system.
On the other hand, when transmit power is too small, ditch messenger does not reach the effect for notifying adjacent other nodes, and packet is mutually collided, and also results in the network capacity of reduction whole system.Because the size of transmit power can interfere with other nodes of this neighbouring node, and it is relevant with the topological structure of network, and the topological structure of multihop network is extremely complex, therefore, each node is required for the mechanism for possessing intelligent control in itself, and the environment according to belonging to it is indivedual changes its transmit power at random with state.
According to the present invention, ditch messenger is sent（For example allow to send signal）Transmit power can be adjusted, with notify all can interfere with send the ditch messenger node other nodes.In order to reduce interference, each node can voluntarily regulate and control its transmit power, and signal is sent can reach the minimum transmit power of destination node.In other words, each node can reach the minimum transmit power of all destination nodes, can determine that the node produces the scope of interference to other nodes.
Reference picture 3, in one embodiment of this invention, Centroid（That is node 0) pass through neighbor node（That is node A, B, C, D, E) package that is sent to it, such as a protocol package（Signal Packe t), all it can interfere with other nodes of Centroid to recognize.Therefore, identification of the Centroid to its neighbor node will be determined by sending the power of protocol package.
In one embodiment of this invention, each node in wireless network voluntarily regulates and controls a method of its transmit power, it is first to set maximum transmit power, the i.e. P that the node is transmitted, this maximum transmit power can be according to depending on the minimum transmit power that can reach all destination nodes.
Then, each node in wireless network can be by periodically sending a package to Centroid, such as a protocol package（Signal Packet), enable why Centroid recognizes the neighbor node around it.According to the present invention, the power of protocol package can be calculated with following equation：
Protocol package power (SP Power)=maximum transmit power (P)+signal to noise ratio (SNR).
Wherein, because protocol package is required to by all other nodes demodulation that can receive interference, therefore, the transmit power of protocol package may be set to the maximum transmit power of node transmission, that is P, and signal to noise ratio (SNR is Signal-to-noise ratio) can be to allow to send（CTS is Clear to Send) signal to noise ratio of the transmission rate of signal.
In the preferred embodiment of the present invention, due to the concrete application environment of each node apparatus, including weather, weather, the difference of landform etc., the small variations of each device individual can be caused, therefore, system is specifically corrected present invention introduces environmental variance (margin).That is, the transmit power of above-mentioned protocol package, may be set to the maximum transmit power of node transmission, i.e. P, with its signal to noise ratio (signal-to- noise ratio) and an environmental variance (margin) and value, that is,
Protocol package power (SP Power)=maximum transmit power (P)+signal to noise ratio (SNR)+environmental variance (margin).
Wherein, signal to noise ratio（SNR) be for example allow send signal ditch messenger transmission rate signal to noise ratio（SNR), and environmental variance can for one detection variable, calculated by RNC (RTS no CTS), its specific calculation, can refer to the PCT Patent Cases of " wireless communications method and device of single antenna multichannel ".
In a preferred embodiment, in order to reduce consumption of the protocol package to whole system Internet resources, the present invention can more extend each node and send the cycle of protocol package and/or reduce the size of protocol package.
According to the present invention, after Centroid receives one or more protocol packages, you can the transmit power for the ditch messenger for needing to send is calculated using the information of this protocol package, for example, allow the transmit power for sending signal.In one embodiment of this invention, the transmit power of ditch messenger is obtained by below equation：Link up signal transmitting power=maximum loss value Max (loss)+signal to noise ratio (SNR).
Wherein, maximum loss value can be obtained in each neighbor node with lookup table mode, and signal to noise ratio is the signal to noise ratio for for example allowing to send the transmission rate of the ditch messenger of signal.
In the preferred embodiment of the present invention, due to the concrete application environment of each node, including weather, weather, the difference of landform etc. can cause the small variations of each device individual, therefore, system is specifically corrected present invention introduces environmental variance (margin).That is, the transmit power of above-mentioned ditch messenger, may be set to maximum loss value, that is Max (loss), with its signal to noise ratio (signal-to-noise ratio) and an environmental variance (margin) and value, that is,
Link up signal transmitting power=maximum loss value MaX(l0SS)+signal to noise ratio (SNR)+environmental variance (margin).
Wherein, maximum loss value can be in each neighbor node, obtained with lookup table mode, and signal to noise ratio is the signal to noise ratio for for example allowing to send the transmission rate of the ditch messenger of signal, and environmental variance can be a detection variable, calculated by RNC (RTS no CTS), its specific calculation, the PCT Patent case of " wireless communications method and device of single antenna multichannel " is can refer to, as already mentioned.
In another preferred embodiment of the present invention, the transmit power of ditch messenger can more introduce a bottom (noise floor) value of making an uproar and system is specifically corrected.That is, the transmit power of above-mentioned ditch messenger, may be set to maximum loss value, that is Max (loss), with its signal to noise ratio (signal-to-noise ratio) and environmental variance (margin) and a bottom make an uproar value and value, that is,
Link up signal transmitting power=maximum loss value MaX(l0SS)+signal to noise ratio (SNR)+environmental variance (margin)+bottom is made an uproar value (NP).
Wherein, maximum loss value can be in each neighbor node, obtained with lookup table mode, and signal to noise ratio is the signal to noise ratio for for example allowing to send the transmission rate of the ditch messenger of signal, and environmental variance can be a detection variable, calculated, its specific calculation can refer to and " believed single antenna more by RNC (RTS no CTS)
The PCT Patent case of the wireless communications method and device in road ", as already mentioned, and bottom, which is made an uproar, to be sum total noisy in addition to signal.
As shown in figure 3, node 0 is received after neighbor node A, B, C, D, the protocol package that E is each sended over, it can count in its packet transmit process, transmission is grouped to it may produce the adjacent node of interference, i.e. node A, B, C, D, E points.Node 0, which is tabled look-up, obtains node A, B, C, D, E and the loss between it（Loss) value, takes its i.e. Max of maximum (loss).And the transmit power for the ditch messenger for for example allowing to send signal can be obtained by above-mentioned formula.
In another embodiment of the present invention, reduction is disturbed and expands transmission rate and the transmit power implementation of the more permeable regulation and control ditch messenger of network capacity, and its details has described as above, to repeat no more.
Thereby, the beneficial effects of the invention are as follows：1st, anti-interference has obtained the raising of matter；2nd, the network capacity of wireless network is substantially increased；3rd, price is low, easy to maintenance, and service life is long；4th, method is simple, and it is easy to realize, applied widely.
The present invention makees one by embodiments above and described in detail, and only as described above, only to illustrate presently preferred embodiments of the present invention, can not limit the practical range of the present invention.I.e. all equivalent changes and modifications made according to the present patent application scope etc., all should still belong in patent covering scope of the present invention.
Claims (1)
- Claims1. a kind of method for reducing the Communication Jamming in a wireless network, it is characterised in that methods described is included：Recognize multiple neighbor nodes of a Centroid；One first ditch messenger is sent to the multiple neighbor node, wherein the first ditch messenger is only sent to by the Centroid be considered as in the wireless network node of the multiple neighbor node；And according to the first ditch messenger, when the node in the Centroid and the multiple neighbor node carries out data transmission, other nodes in the multiple neighbor node do not send a data in a same channel, and then reduce the Communication Jamming in the wireless network.2. the method as described in claim 1, it is characterised in that the identification step is included：A signal package is detected, the transmission signal package is considered as to the neighbor node of the Centroid to a node of the Centroid.3. the method as described in claim 1, it is characterised in that the first ditch messenger is one to allow to send signal.4. the method as described in claim 1, it is characterised in that described method further includes the power that adjustment sends the first ditch messenger.5. method as claimed in claim 4, it is characterised in that the power is a maximum loss value between the Centroid and the neighbor node and one and value of a signal to noise ratio.6. method as claimed in claim 5, it is characterised in that the power further includes an environmental variance.7. method as claimed in claim 5, it is characterised in that the power further includes a bottom and made an uproar value, is the noisy sum total of institute in the wireless network.8. method as claimed in claim 2, it is characterised in that send a power of the signal package, is the peak power transmitted by the node and one and value of a signal to noise ratio.9. method as claimed in claim 8, it is characterised in that the power further includes an environmental variance.10. method as claimed in claim 2, it is characterised in that the node periodically sends the signal package to the Centroid.11. the method as described in claim 1, it is characterised in that described method further includes the size according to the wireless network, adjustment sends a speed of the first ditch messenger.12. the method as described in claim 1, it is characterized in that, described method further includes one second ditch messenger of transmission, can first it be issued prior to the first ditch messenger, make the Centroid according to the second ditch messenger, and then send the first ditch messenger to the multiple neighbor node.13. method as claimed in claim 12, it is characterised in that the second ditch messenger is a request to send signal.14. forwarding method as claimed in claim 2, it is characterised in that the signal package is a protocol package.15. method as claimed in claim 10, it is characterised in that the node is the adjustable transmission signal package to a cycle of the Centroid or a size of the change signal package.16. the system of the Communication Jamming in-kind of one wireless network of reduction, it is characterised in that the system is included：One receiving node, multiple neighbor nodes can be recognized, to send one first ditch messenger to the multiple neighbor node, wherein described first ditch messenger is only sent to by the receiving node be considered as in the wireless network node of the multiple neighbor node, according to the first ditch messenger, when the node in the receiving node and the multiple neighbor node carries out data transmission, other nodes in the multiple neighbor node do not send a data in a same channel, and then reduce the Communication Jamming in the wireless network.17. system as claimed in claim 16, it is characterised in that the receiving node will send a signal package and be considered as the neighbor node to a node of the receiving node.18. system as claimed in claim 16, it is characterised in that the first ditch messenger is one to allow to send signal.19. system as claimed in claim 16, it is characterised in that the receiving node is the adjustable power for sending the first ditch messenger.20. system as claimed in claim 19, it is characterised in that the power is a maximum loss value between the receiving node and the neighbor node and one and value of a signal to noise ratio.21. system as claimed in claim 20, it is characterised in that the power further includes an environmental variance.22. system as claimed in claim 20, it is characterised in that the power further includes a bottom and made an uproar value, is the noisy sum total of institute in the wireless network.23. system as claimed in claim 17 a, it is characterised in that power of the signal package transmitted by the neighbor node, is the peak power transmitted by the neighbor node and one and value of a signal to noise ratio.24. system as claimed in claim 23, it is characterised in that the power further includes an environmental variance.25. system as claimed in claim 17, it is characterised in that the neighbor node periodically sends the signal package to the receiving node.26. system as claimed in claim 16, it is characterised in that the receiving node can send a speed of the first ditch messenger according to a size of the wireless network, adjustment.27. system as claimed in claim 16, it is characterized in that, described system further includes a sending node, for sending one second ditch messenger to the receiving node, the second ditch messenger can be issued prior to the first ditch messenger, make the receiving node according to the second ditch messenger, and then send the first ditch messenger to the multiple neighbor node.28. system as claimed in claim 27, it is characterised in that the second ditch messenger is a request to send signal.29. system as claimed in claim 17, it is characterised in that the signal package is a protocol package.30. system as claimed in claim 25, it is characterised in that the neighbor node is adjustable to send the signal package to a cycle of the receiving node or a size of the change signal package.
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| Application Number | Priority Date | Filing Date | Title |
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| PCT/CN2008/072507 WO2010034151A1 (en) | 2008-09-25 | 2008-09-25 | Method and system for resisting interference and enlarging network capability in wireless multi-hop networks |
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| US7269152B2 (en) * | 2003-02-14 | 2007-09-11 | Motorola, Inc. | Method and apparatus for transmitting information within a communication system |
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Application publication date: 20100908 |