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 PDF

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Publication number
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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CN
China
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node
characterized
signal
system
method
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CN200880013246A
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Chinese (zh)
Inventor
郑虹
吕辉
戴汉庆
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智格网信息科技(成都)有限公司
智格网信息科技(上海)有限公司
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Priority to PCT/CN2008/072507 priority Critical patent/WO2010034151A1/en
Publication of CN101828419A publication Critical patent/CN101828419A/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022Site diversity; Macro-diversity
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access, e.g. scheduled or random access
    • H04W74/08Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0808Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
    • H04W74/0816Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA carrier sensing with collision avoidance

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 systems, specifically, being a kind of method and system of resisting interference and enlarging network capability in wireless multi-hop networks, belong to wireless communication technology field.

Background technique

Shared network is jumped different from one, the wireless channel of multihop network is shared broadcast channel.In a multihop network, when a node sends grouping, the node (referred to as neighbor node) only in its coverage area can be received, and the node outside coverage area then perceives the presence less than any communication.This is exactly also the advantage place of multihop network, i.e., the node outside sending node coverage area is not influenced by sending node, and can send grouping simultaneously.

In the prior art, it is exactly that the location of packet collisions and node are related that the shared broadcast channel of multi-hop was brought, which directly affects,.In the broadcast channel that one jumps shared, packet collisions are a clobals.It is to perceive packet collisions if all nodes do not receive correct grouping.But multihop network is using CSMA/CA (csma/collision detection method), packet collisions are local event, that is other nodes in packet network that a node issues are different surely to be received, to will appear " concealed nodes " problem.

As shown in Figure 1, since node A is not within the antenna footprint of node C, node A becomes " concealed nodes " that cannot receive grouping information when node C issues grouping information.

The known method for solving " concealed nodes ", it is to utilize a sending node before sending data, primary short control message is first carried out with a receiving node to shake hands, for example, it is to implement one of the method that short control message is shaken hands that request, which sends and allow to send the transmission of signal (RTS/CTS i.e. Request to Send/Clear to Send),.

However, the introducing of request to send/allowed to send, can have an impact the network capacity of whole system.If the transmission power for allowing to send signal (CTS i.e. Clear to Send) is too big, some no artis can be accidentally notified, so that no artis unnecessary " waiting " is occurred, reduce the network capacity of whole system.But it is another The effect for notifying adjacent other nodes is not achieved if the transmission power for allowing to send signal (CTS i.e. Clear to Send) is too small in aspect.Data packet is mutually collided, and the network capacity for reducing whole system is also resulted in.Therefore, this technology needs to find a reasonable equilibrium valve between the transmission power and network capacity of ditch messenger (for example, allowing to send signal).

Summary of the invention

A purpose of the invention is to overcome deficiency in the prior art, and provides a kind of effective solution of network capacity that can greatly improve whole network.Method and system of the invention can send a parameter of ditch messenger using regulation, to reduce interference and improve network capacity.

In one embodiment of this invention, one sending node (an also referred to as node) is before sending data, it first sends a ditch messenger and gives a receiving node (an also referred to as central node), for example, sending node (i.e. this node) can first carry out primary short control message with receiving node (i.e. central node) and shake hands, notified in a manner of short message neighbor node it will be received, this ditch messenger can be for for example

RTS/CTS mode (Request to Send/Clear to Send).

According to the present invention, what central node issued allows to send a transmission rate and a transmission power of (CTS i.e. Clear to Send) signal, effectively it can be selected and be controlled, so that in whole network, the interference effectively eliminated between neighbor node can be reached, also the capacity of whole network system can be greatlyd improve, so that its wireless multi-hop networks network throughput, anti-interference be made all to be greatly enhanced.

Whereby, the present invention is able to utilize one ditch messenger of transmission, and reduce the issuable interference of adjacent other node institutes, and within the period of sending node and receiving node transmission data grouping, it avoids adjacent other nodes from sending data grouping in same channel, and then reduces the generation of interference hits.

In relation to the present invention to the parameter for sending a ditch messenger, such as power is sent to the transmission rate for allowing to send (CTS i.e. Clear to Send) signal and one, it is selected and is controlled using effective mechanism, and reach around reduction interference, and expand the details of network capacity, details are as follows.

Detailed description of the invention

Fig. 1 is the example of the antenna footprint of each node.

Fig. 2 is an example of correct range and disturbance range of the invention. 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.

Specific embodiment

According to the present invention, it reduces interference and the parameter for expanding the permeable regulation transmission ditch messenger of network capacity is implemented.As shown in Figure 4, in one embodiment of this invention, node A (i.e. sending node or this node) needs are communicated with node 0 (i.e. receiving node or central node), node A can be in a such as sounding channel, first send a ditch messenger, such as one request send (RTS, that is, Request to Send) signal, if node 0 is free idle channel, then node 0 sends a corresponding ditch messenger in sounding channel, such as one allow send (CTS i.e. Clear to Send) signal, to notify node A that can carry out data transmission.In a preferred embodiment, node 0 (i.e. central node) can more notify adjacent around node B, C simultaneously, D (i.e. neighbor node), between 0 data transfer period of node A and node, data are not 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 may include one correctly receiving range and a disturbance range.In one embodiment, correctly receiving range may be defined as the limit value that signal-to-noise ratio (SNR i.e. signal-to-noise ratio) is greater than correct demodulation needs, and disturbance range may be defined as signal greater than noise but be less than the limit value of correct demodulation needs.

According to the present invention, in disturbance range under the premise of minimum, the transmission rate of ditch messenger (such as allowing to send signal) is improved, it can increase the handling capacity of single-hop.This is because rate is turned up, transmission time is short, and therefore, within a unit time, network utilization is improved.But rate it is high while, signal-to-noise ratio (SNR, that is, signal-to-noise ratio) can also become larger, and therefore, reach same transmission range, and sending power can also correspondingly increase, and then causes interference with range and become larger.

For example, in intensive small wireless network, wherein all nodes all can cross-reference i.e. within same transmission range, therefore, in the case where rate height, the big disturbance range of generation influences it less, so, intensive small wireless network is suitble to that transmission rate is turned up, to improve local network capacity. Another example is lifted, in large-scale wireless network, all nodes are not in same transmission range, and therefore, in the case where rate height, the big disturbance range of generation influences it very greatly, to turn down the transmission rate of ditch messenger, can reduce whole interference.So large-scale wireless network is suitble to turn down transmission rate, to improve the throughput of system of entire wireless network.

According to the present invention, reducing interference and expanding network capacity can be implemented using the parameter for sending regulation ditch messenger.In another embodiment of the invention, the parameter for sending this ditch messenger can send power for one.The present invention regulates and controls the key of the transmission power of ditch messenger, is to occur to obtain balance between interference hits and system network capacity.When transmission power is too big, ditch messenger can accidentally notify some no artis, so that this node was sent in the period of data grouping, because avoiding interference hits occur for other nodes, and stop sending data grouping, it instead results in no artis and unnecessary " waiting " occurs, thereby reduce the network capacity of whole system.

On the other hand, when transmission power is too small, the effect for notifying adjacent other nodes is not achieved in ditch messenger, and data packet is mutually collided, and also results in the network capacity for reducing whole system.Size due to sending power can interfere with other nodes of this neighbouring node, and it is related with the topological structure of network, and the topological structure of multihop network is extremely complex, therefore, each node itself requires the mechanism for having intelligent control, changes its at random according to its individual affiliated environment and state and sends power.

According to the present invention, the transmission power for sending ditch messenger (such as allow send signal) can be adjusted, to notify all can be interfered with to send other nodes of the node of the ditch messenger.In order to reduce interference, each node can voluntarily regulate and control it and send power, send signal can reach the minimum transmission power of destination node.In other words, each node can reach the minimum transmission power of all destination nodes, can determine that the node generates the range of interference to other nodes.

Referring to Fig. 3, in one embodiment of this invention, central node (i.e. node 0) penetrates neighbor node (i.e. node A, B, C, D, E) package that it is issued, such as a protocol package (Signal Packe t), to recognize all other nodes that can interfere with central node.Therefore, the power for sending protocol package will determine identification of the central node to its neighbor node. In one embodiment of this invention, each node in wireless network voluntarily regulates and controls its method for sending power, it is first to set the node is sent one maximum transmission power, i.e. P, depending on this maximum transmission power can send power according to the minimum that can reach all destination nodes.

Then, each node in wireless network can enable why central node recognizes surrounding neighbor node by periodically sending a package to central node, such as a protocol package (Signal Packet).According to the present invention, the power of protocol package can be calculated with following equation:

Protocol package power (SP Power)=maximum sends power (P)+signal-to-noise ratio (SNR).

Wherein, since protocol package is required to by all other nodes demodulation that will receive interference, therefore, the transmission power of protocol package may be set to the maximum of node transmission and send power, that is P, and signal-to-noise ratio (SNR, that is, Signal-to-noise ratio) can be the signal-to-noise ratio for allowing to send the transmission rate of (CTS i.e. Clear to Send) signal.

In a preferred embodiment of the invention, due to the specific application environment of each node apparatus, including weather, weather, the difference of landform etc., it will lead to the small variations of each device individual, therefore, present invention introduces environmental variances (margin) specifically to be corrected to system.That is, the transmission power of above-mentioned protocol package, may be set to the maximum of node transmission and send power, i.e. P, with its signal-to-noise ratio (signal-to- noise ratio) and an environmental variance (margin) and value, also that is,

Protocol package power (SP Power)=maximum sends power (P)+signal-to-noise ratio (SNR)+environmental variance (margin).

Wherein, signal-to-noise ratio (SNR) is the signal-to-noise ratio (SNR) for for example allowing to send the transmission rate of ditch messenger of signal, and environmental variance can be a detection variable, it is calculated by RNC (RTS no CTS), its specific calculation can refer to the PCT Patent Case 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 period of protocol package and/or reduce the size of protocol package. According to the present invention, after central node receives one or more protocol packages, i.e., the transmission power for needing the ditch messenger sent can be calculated using the information of this protocol package, such as allow to send the transmission power of signal.In one embodiment of this invention, the transmission power of ditch messenger is obtained by following formula: linking 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 ditch messenger of signal.

In a preferred embodiment of the invention, due to the specific application environment of each node, including weather, weather, the difference of landform etc. will lead to the small variations of each device individual, therefore, present invention introduces environmental variances (margin) specifically to be corrected to system.That is, the transmission 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, it is 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 ditch messenger of signal, and environmental variance can be a detection variable, be calculated by RNC (RTS no CTS), specific calculation, it can refer to the PCT Patent case of " wireless communications method and device of single antenna multichannel ", as already mentioned.

In another preferred embodiment of the present invention, the transmission power of ditch messenger can more introduce a bottom (noise floor) value of making an uproar and specifically be corrected to system.That is, the transmission 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(l0SSMake an uproar value (NP) at)+signal-to-noise ratio (SNR)+environmental variance (margin)+bottom.

Wherein, maximum loss value can be in each neighbor node, it is 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 ditch messenger of signal, and environmental variance can be a detection variable, " single antenna mostly letter is calculated, specific calculation can refer to by RNC (RTS no CTS) The wireless communications method and device in road " PCT Patent case, as already mentioned, and bottom, which is made an uproar, to be sum total noisy other than signal.

As shown in figure 3, node 0 receives neighbor node A, B, C, after the protocol package that D, E are respectively sended over, it can count in its data grouping transmit process, transmission is grouped to it may generate the adjacent node of interference, i.e. node A, B, C, D, E point.Node 0 tables look-up to obtain node A, B, C, D, E and loss (loss) value between it, takes its i.e. Max of maximum (loss).And the transmission power for allowing to send the ditch messenger of signal can be obtained for example by above-mentioned formula.

In another embodiment of the present invention, reduces the transmission rate for interfering and expanding the more permeable regulation ditch messenger of network capacity and send power and implement, details has described as above, to repeat no more.

Whereby, the beneficial effects of the present invention are: 1, anti-interference has obtained the raising of matter;2, the network capacity of wireless network is substantially increased;3, price is low, easy to maintain, long service life;4, method is simple, realizes and is easy, applied widely.

The present invention makees one by embodiments above and is described in detail, and only as described above, is only to illustrate presently preferred embodiments of the present invention, can not limit practical range of the invention.It is i.e. all according to equivalent changes and modifications made by the present patent application range etc., should still belong in the invention patent covering scope.

Claims (1)

  1. Claims
    1. a kind of method for reducing the Communication Jamming in a wireless network, which is characterized in that the method includes: multiple neighbor nodes of one central node of identification;
    One first ditch messenger is sent to the multiple neighbor node, wherein the first ditch messenger is only sent to be considered as the node of the multiple neighbor node in the wireless network by the central node;And according to the first ditch messenger, when the node in the central 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.
    2. the method as described in claim 1, which is characterized in that the identification step includes: one signal package of detection will send the neighbor node that the signal package is considered as the central node to a node of the central node.
    3. the method as described in claim 1, which is characterized in that the first ditch messenger be one allow send signal.
    4. the method as described in claim 1, which is characterized in that the method further includes the power that adjustment sends the first ditch messenger.
    5. method as claimed in claim 4, which is characterized in that the power is one and value of the maximum loss value and a signal-to-noise ratio between the central node and the neighbor node.
    6. method as claimed in claim 5, which is characterized in that the power further includes an environmental variance.
    7. method as claimed in claim 5, which is characterized in that the power further includes a bottom and makes an uproar value, is the noisy sum total of institute in the wireless network.
    8. method according to claim 2, which is characterized in that the power for sending the signal package is one and value of a maximum power transmitted by the node Yu a signal-to-noise ratio.
    9. method according to claim 8, which is characterized in that the power further includes an environmental variance.
    10. method according to claim 2, which is characterized in that the node periodically sends the signal package to the central node.
    11. the method as described in claim 1, which is characterized in that the method further includes the size according to the wireless network, and adjustment sends a rate of the first ditch messenger.
    12. the method as described in claim 1, it is characterized in that, the method, which further includes, sends one second ditch messenger, it can be first issued prior to the first ditch messenger, make the central node according to the second ditch messenger, and then sends the first ditch messenger to the multiple neighbor node.
    13. method as claimed in claim 12, which is characterized in that the second ditch messenger is a request to send signal.
    14. forwarding method as claimed in claim 2, which is characterized in that the signal package is a protocol package.
    15. method as claimed in claim 10, which is characterized in that the node is the adjustable transmission signal package to a period of the central node or a size of the change signal package.
    16. the system of the Communication Jamming in-kind of one wireless network of reduction, which is characterized in that the system includes:
    One receiving node, multiple neighbor nodes can be recognized, to send one first ditch messenger to the multiple neighbor node, wherein the first ditch messenger is only sent to be considered as the node of the multiple neighbor node in the wireless network by the receiving 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, which is characterized 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, which is characterized in that the first ditch messenger be one allow send signal.
    19. system as claimed in claim 16, which is characterized in that the receiving node is the adjustable power for sending the first ditch messenger.
    20. system as claimed in claim 19, which is characterized in that the power is one and value of the maximum loss value and a signal-to-noise ratio between the receiving node and the neighbor node.
    21. system as claimed in claim 20, which is characterized in that the power further includes an environmental variance.
    22. system as claimed in claim 20, which is characterized in that the power further includes a bottom and makes an uproar value, is the noisy sum total of institute in the wireless network.
    23. system as claimed in claim 17, which is characterized in that a power of the signal package transmitted by the neighbor node is one and value of a maximum power transmitted by the neighbor node Yu a signal-to-noise ratio.
    24. system as claimed in claim 23, which is characterized in that the power further includes an environmental variance.
    25. system as claimed in claim 17, which is characterized in that the neighbor node periodically sends the signal package to the receiving node.
    26. system as claimed in claim 16, which is characterized in that the receiving node can adjust the rate for sending the first ditch messenger according to a size of the wireless network.
    27. system as claimed in claim 16, it is characterized in that, the 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 sends the first ditch messenger to the multiple neighbor node.
    28. system as claimed in claim 27, which is characterized in that the second ditch messenger is a request to send signal.
    29. system as claimed in claim 17, which is characterized in that the signal package is a protocol package.
    30. system as claimed in claim 25, which is characterized in that the neighbor node is adjustable to send the signal package to a period of the receiving node or a size of the change signal package.
CN200880013246A 2008-09-25 2008-09-25 Method and system for resisting interference and enlarging network capability in wireless multi-hop networks CN101828419A (en)

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* Cited by examiner, † Cited by third party
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US7269152B2 (en) * 2003-02-14 2007-09-11 Motorola, Inc. Method and apparatus for transmitting information within a communication system
CN101242208B (en) * 2008-03-13 2011-04-20 上海交通大学 Transmission control frame method based on dynamic power adjustment

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