CN101232452A - Broadcasting channel data transmission method of industry wireless sensor network - Google Patents
Broadcasting channel data transmission method of industry wireless sensor network Download PDFInfo
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- CN101232452A CN101232452A CNA2008100467846A CN200810046784A CN101232452A CN 101232452 A CN101232452 A CN 101232452A CN A2008100467846 A CNA2008100467846 A CN A2008100467846A CN 200810046784 A CN200810046784 A CN 200810046784A CN 101232452 A CN101232452 A CN 101232452A
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Abstract
The invention relates to a broadcast channel data transmission method of an industrial wireless sensor network. The utility model comprises the following steps that a deny message including data grouping is sent to a receiving end after the receiving end determines that the data grouping in the data grouping group is not received successfully; after the deny message is determined to be received by the receiving end, whether the passed time is more than a presetting time interval after the data grouping is sent is judged; the data grouping is resent to the receiving end.
Description
Technical field
The present invention relates to the industrial wireless communication field, relate in particular to a kind of broadcasting channel data transmission method of industrial wireless sensor network.
Background technology
The wireless industrial technology is after fieldbus, industrial control field a hot spot technology arranged, be the revolutionary technology that reduces the industry measurement and control system cost, improves the industry measurement and control system range of application, in industrial automation coming years product new growth point.
The wireless industrial technology is that a kind of beginning of this century is emerging, the wireless communication technology of short distance, low rate information interaction between equipment oriented, being adapted at abominable industry spot environment uses, have technical characterictics such as very strong antijamming capability, super low energy consumption, real time communication, be to function expansion and the technological innovation of existing wireless technology on the commercial Application direction, and will finally be converted into new this wireless technology standard.It is development and come from emerging wireless sensor network technology.The wireless industrial technology is to satisfy a class wireless sensor network technology of specific demands such as commercial Application is highly reliable, low-power consumption, hard real-time.Its development prospect is very good, a wireless senser market survey nearest according to U.S. On World company shows, 79% the user that investigated is considering to use wireless device to finish remote monitoring, particularly pipeline operation industry and water source monitoring, the networking solution of monitoring platform is in real time all being sought by nearly all larger hydrocarbon company.An investigation of U.S.'s Control Engineering magazine report shows that in industrial automation market, end user and system integrator show strong interest to radio network technique.45% interviewee plans in radio network technique on probation in 2005.And nearly 70% interviewee is paying close attention to the progress of wireless technology in the industrial measurement and control application facet.Can save about wireless network on this problem of how many costs, 58% interviewee believes, wireless senser of every employing, and this technology has been saved on line and labour and has been surpassed 100 dollars cost; 33% interviewee thinks that each transducer can save above 250 dollars.Venture DevelopmentCorporation points out in its " North America discrete and the manufacturing RF/ microwave wireless monitoring of process and control produce market investigation report ", the output of the relevant wireless product in industrial automation field 2004 was 6,100,000 dollars, estimated will to increase fast with 60.2% annual growth from now on.
And most Industry Control Application requires the reliable transmission rate of data to surpass 95%, and very high to the last reliability requirement of channel data transmission like this, this patent just is being based on this, has proposed a kind of channel repeating method that can improve reliability.
The congestion problems that the performance of mobile communication system exists in wire message way, also mainly be subjected to the restriction of time varying channel, various noises, interference, decline etc. have greatly reduced the quality of Radio Link.Propagation path between transmitter and the receiver is very complicated, from simple line-of-sight propagation, to the atural object that meets with various complexity, as fabrication, mountain range and leaf etc.; In land mobile communication system, travelling carriage is among the architecture ensemble or is in zone with a varied topography, its antenna will receive the signal that is transmitted by mulitpath, add the motion of travelling carriage itself, make that wireless channel between travelling carriage and the base station is changeable and be difficult to control, cause that the reduction suddenly of signal strength signal intensity is that so-called decline is recurrent in the wireless channel.
Wireless application protocol (wap) has been developed the needs that are used to handle travelling carriage, because these equipment have serious physics, storage and processing constraint.WAP can be applicable to multiple different system, comprises GSM-900, GAM-1800, GSM-1900, CDMA IS-95, TDMA IS-136, broadband IS-95, and such as the third generation system of IMT-2000, UMTS and W-CDMA.
According to WAP, have three class affairs: classification 0 is used for insecure unidirectional request, and classification 1 is used for reliable unidirectional request, and classification 2 is used for reliable two-way request-response transactions.Affairs are defined as the interaction unit between " promoter " (for example, transmit leg or recipient) and " respondent " (for example, transmit leg or recipient).Affairs start from the request message that transmit leg generates.In classification 2 affairs, the recipient replys with a results messages of implicit this request message of affirmation.Surpass designated time intervals if the recipient handles the time that this request message spends, the recipient can reply " hanging on " acknowledge message to avoid retransmitting this request message before sending results messages.End of transaction when transmit leg receives this affirmation.
In order to reduce the problems referred to above that exist in congested and the propagation, before data-message sent, it was split into the sequence of data packets of orderly arrangement.Each packet has the grouping serial number (PSN) of distributing to it.Therefore, for example, first packet of cutting apart is assigned with 1, the three data packet allocation grouping serial number 2 of 0, the second data packet allocation of grouping serial number grouping serial number, by that analogy.These packet independence or combination of transmitted receive that the back is reconfigured by the recipient.The alienable largest packet number of message is about 256 groupings, and the full-size of each grouping is the 1-2k byte.Therefore, the full-size of message is typically less than the 0.5M byte.
If packet is split into group, so up to the packet group (packet group) of confirming to receive the front, send just now and send, belong to the new grouping of same affairs.Typically, transmit leg is determined the packet count in each packet group, and in the grouping with transmission packet group in a collection of.Last packet of each packet group has group's afterbody (GTR) attribute set (flag set), and it is referred to as the GTR grouping.Last packet of last packet group of whole message has transmission afterbody (TTR) attribute set, and it also is referred to as the TTR grouping.The recipient stores the grouping of all receptions, and one receive GTR grouping, and the recipient just detects it and whether received all groupings that belong to this specific cluster group.As detecting all groupings that received in this group, the recipient returns the affirmation message of the grouping serial number that includes this GTR grouping so.Yet, if receive GTR or TTR grouping, but one or more packet loss of this packet group, the recipient includes the denying before (NACK) message of grouping serial number of the lost packets of this specific cluster group in transmission so, wait for a period of time, for example 1/2 intermediate value round trip cycle (RTT).If the fixed time of transmit leg after sending packet group do not receive the confirmation at interval, its GTR or TTR of only retransmitting this packet group is grouped into the recipient so.
Yet, if during the transmission because the handoff error of cordless communication network or congestedly cause one or more affirmations or deny information drop-out for example, thereby causing retransmitting the packet that the recipient has received, this will go wrong.
Summary of the invention
In order to solve problems of the prior art, the invention provides a kind of broadcasting channel data transmission method of industrial wireless sensor network, thereby realized the reliability transmission of information in the wireless channel.
Wireless channel data transmission method provided by the invention comprises:
After the definite packet that does not successfully receive in the packet group of recipient, send the message of denying that comprises packet to the recipient;
Transmit leg determine to receive described deny message after, judge to send described packet after elapsed time greater than preset time at interval; Resend described grouped data and give described recipient.
Further, described to the recipient send comprise packet deny message be described recipient judge the stand-by period that sends first after denying message surpass wait for threshold value after, resend.
Further, the described packet of denying that message comprises is all packets of losing in the whole process.
Further, described packet has transmission afterbody attribute set or group's afterbody attribute set.
Further, described method also is included in described recipient after receiving the packet that has group's afterbody attribute set, sends response message to transmit leg.
Further, described method also is included in described recipient after receiving the packet that has transmission afterbody attribute set, sends response message to transmit leg.
Therefore, the present invention can realize reliable information transmission on the wireless channel.
Description of drawings
Fig. 1 for the broadcasting channel data transmission method of industrial wireless sensor network of the present invention based on the structural representation of data transmission system;
The data message format schematic diagram through cut apart of Fig. 2 for transmitting in the broadcasting channel data transmission method of industrial wireless sensor network of the present invention;
Fig. 3 is the flow chart of the broadcasting channel data transmission method of industrial wireless sensor network of the present invention.
Embodiment
Below by drawings and Examples, the technical scheme of the embodiment of the invention is described in further detail.
The broadcasting channel data transmission method that is illustrated in figure 1 as industrial wireless sensor network of the present invention based on the structural representation of data transmission system.This data transmission system 10 comprises travelling carriage 11 (for example mobile phone), and it is by airlink 15 (for example comprising base station and exchange control point) and gateway 13 radio communications, and gateway 13 links to each other with server 17 by the wide area network such as internet or Intranet.Data transmission method is travelled to and fro between travelling carriage 11 transmission data according to the present invention.
Fig. 2 for data flow in the broadcasting channel data transmission method of industrial wireless sensor network of the present invention through divided data message format schematic diagram.This data-message comprises that a plurality of packet groups are as organizing 1, organizing 2 ... group M.Each group comprises the packet 30 of one or more no marks collection and the packet 32 of GTR attribute set is arranged.Last packet of GTR regular set designation data packet group.Last grouping 34 of whole data-message comprises the TTR attribute set.Each packet 30 of data-message interrelates with unique identifier, and grouping serial number (PSN) for example is so that recipient (for example travelling carriage 11) can discern lost data packets in this data-message based on identifier.These packets have continuous numbering (for example: 0,1,2,3,4 ...).
As the flow chart of Fig. 3 for the broadcasting channel data transmission method of industrial wireless sensor network of the present invention, step 1, transmit leg (for example, gateway 13 or server 17) send packet 30 to the recipient according to the PSN order, so that the packet 30 that PSN is lower sends (for example, the packet of PSN=3 sends prior to the packet of PSN=4) prior to the grouping of PSN higher data.Step 2 is if (for example, but the recipient has received the packet of PSN=3 do not received the packet of PSN=1) lost in recipient's specified data grouping 30, step 3 so, the recipient can send and deny that (NACK) message gives transmit leg, lists the grouping of losing (for example, PSN=1).Wherein, preferred NACK message is not only listed the grouping of losing in the nearest packet group, also will list all groupings of losing before this.For example, if (as yet receive) lost in the packet of PSN=3 from packet group 1, and the packet of PSN=18 loses from packet group 4, and NACK message will list file names with lost data packets (PSN=3 and PSN=18) so.Make it so convenient especially, even because previous NACK information drop-out, lost data packets in the packet group that sends before transmit leg still can be informed to.Consideration can send NACK message receive the GTR packet of each packet group the recipient before or after.
One receives all packets in the group, and the recipient just sends and confirms (ACK) message to transmit leg, and affirmation receives all packets of group, and the packet that then begins combined reception is to reconstitute this data-message.Be similar to the transmission of NACK message, the recipient can send ACK message after the GTR of the group of receiving packet.The recipient also can send ACK message after receiving the TTR packet, confirm to receive all packets in the data-message.Perhaps, the recipient can send NACK message, and listing a particular group does not have lost data packets, thus implicit all packets of confirming to receive in this particular group.
In particularly preferred embodiment, NACK message is not only listed lost data packets, and lists the best result group sequence number in the packet that the recipient receives.Utilize this NACK message, therefore the recipient can imply and confirm to receive all lower packets of PSN (except the lost packets of listing).Illustrate that the example of this NACK message is as follows.Transmit leg sends two groups of packets: have PSN=N, N+1, the grouping of N+2 (GTR); And has PSN=N+3, N+4, the grouping of N+5 (GTR).Two data grouping of PSN=N+2 and N+5 comprises the GTR attribute set, therefore is last packet in their groups separately.The packet of PSN=N and N+1 is lost during the transmission.The recipient then sends NACK message (NACK_1), and the packet of listing PSN=N and N+1 is a lost packets, and last packet (that is, PSN is the highest) that the packet of PSN=N+2 receives for the recipient.Yet NACK_1 has also lost during the transmission.Therebetween, the recipient continues to receive the packet of next packet group: have PSN=N+3, the packet of N+4 and N+5.After the packet of determining PSN=N and N+1 is still lost, the recipient sends second NACK message (NACK_2), list last packet (for example, the packet of PSN=N+5) of reception and lost data packets (packet of PSN=N and N+1) still.The recipient receives NACK_2, and recognizes that the recipient has received all packets in these two data packet group except that the packet of PSN=N and N+1.Resend lost data packets (PSN=N and N+1) after the transmit leg.Consider this NACK message can and acknowledge message combination be used for further strengthening communication reliability between transmit leg and the recipient.
Illustrate wireless channel data transmission method of the present invention, the recipient sends request of data to airlink 15, and link 15 sends this request successively to transmit leg.Transmit leg receives this request of data and sends to airlink 15 has PSN=N, the packet 30 of N+1 and N+2.Yet airlink has only sent the packet of PSN=N+1 and N+2, has missed the packet of PSN=N.The recipient determines the packet loss of PSN=N and sends to airlink 15NACK message (NACK_1), lists the packet of PSN=N.But this NACK message is also lost, and airlink 15 can't be transmitted this NACK message to transmit leg.
Transmit leg still responds the initial data request, sends the packet 30 of the PSN=N+3 and the N+4 of another packet group.Airlink 15 sends to the packet of recipient PSN=N+3 and N+4.After the recipient surpasses the threshold value of setting in the stand-by period, reaffirm the packet loss of PSN=N, and send list lost data packet another NACK message (NACK_2) to airlink 15, link 15 is successfully transmitted this NACK_2 message to transmit leg.Transmit leg response NACK_2 sends the packet of the PSN=N that loses to the recipient by airlink 15.
Introduce the another one example below, the recipient sends request of data to airlink 15, and link 15 sends this successively and asks transmit leg.Transmit leg then sends PSN=N, and the packet of N+1 is to airlink 15.Airlink has been lost the packet of PSN=N, and the packet that only sends PSN=N+1 is to the recipient.The recipient sends to airlink 15 and denies message (NACK_1), lists the packet of PSN=N.The packet that transmit leg continues to send PSN=N+2 is to airlink 15, and link 15 successfully sends this packet to the recipient.The recipient determines the packet loss of (before or after receiving the GTR grouping) PSN=N, sends another afterwards and denies message (NACK_2).Yet airlink sends NACK_1 at last to transmit leg, and its response is to send the packet of PSN=N to airlink 15.Airlink 15 transmits the packet of PSN=N and gives the recipient.Transmit leg preestablishes the time that T1 is used for controlling retransmission, at this moment between in, no matter what receives, transmit leg is the not packet of retransmits lost, only greater than time of T1 the time, has received that NACK is with regard to retransmission.Transmit leg is after sending this packet (PSN=N) less than a T1 in the time interval of (that is, preset time at interval), and transmit leg receives the same packet of request (that is NACK_2 PSN=N).Because NACK_2 receives in less than a T1, so the transmit leg NACK_2 that ignores, refusal sends the packet of being asked.
It should be noted last that, above embodiment is only unrestricted in order to the technical scheme of the explanation embodiment of the invention, although the embodiment of the invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical scheme of the embodiment of the invention, and not break away from the spirit and scope of embodiment of the invention technical scheme.
Claims (7)
1. the broadcasting channel data transmission method of an industrial wireless sensor network is characterized in that comprising:
After the definite packet that does not successfully receive in the packet group of recipient, send the message of denying that comprises packet to the recipient;
Transmit leg determine to receive described deny message after, judge to send described packet after elapsed time greater than preset time at interval; Resend described grouped data and give described recipient.
2. method according to claim 1, it is characterized in that described to the recipient send comprise packet deny message be described recipient judge the stand-by period that sends first after denying message surpass wait for threshold value after, resend.
3. method according to claim 1 and 2 is characterized in that the described packet of denying that message comprises is all packets of losing in the whole process.
4. method according to claim 1 and 2 is characterized in that described packet has transmission afterbody attribute set or group's afterbody attribute set.
5. method according to claim 4 is characterized in that also being included in described recipient after receiving the packet that has group's afterbody attribute set, sends response message to transmit leg.
6. method according to claim 4 is characterized in that also being included in described recipient after receiving the packet that has transmission afterbody attribute set, sends response message to transmit leg.
7. method according to claim 4 is characterized in that the described best result group sequence number of denying in the packet that message comprises that also described recipient receives.
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| CN2008100467846A CN101232452B (en) | 2008-01-25 | 2008-01-25 | Broadcasting channel data transmission method of industry wireless sensor network |
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| CN2008100467846A CN101232452B (en) | 2008-01-25 | 2008-01-25 | Broadcasting channel data transmission method of industry wireless sensor network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103037321A (en) * | 2011-10-06 | 2013-04-10 | 通用汽车有限责任公司 | Method of communicating with a vehicle having a telematics unit |
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| US6301249B1 (en) * | 1998-08-04 | 2001-10-09 | Opuswave Networks, Inc | Efficient error control for wireless packet transmissions |
| CN100579128C (en) * | 2004-01-09 | 2010-01-06 | 日本电气株式会社 | Communication method, node and controlling device of node |
| GB0414057D0 (en) * | 2004-06-23 | 2004-07-28 | Koninkl Philips Electronics Nv | Method of,and system for,communicating data, and a station for transmitting data |
| JP4742669B2 (en) * | 2005-05-13 | 2011-08-10 | ソニー株式会社 | Transmission / reception system, transmission apparatus and transmission method, reception apparatus and reception method, and program |
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| CN103037321A (en) * | 2011-10-06 | 2013-04-10 | 通用汽车有限责任公司 | Method of communicating with a vehicle having a telematics unit |
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Granted publication date: 20110209 Termination date: 20120125 |