CN103684711A - Channel model based factory automation wireless network ARQ retransmitting method - Google Patents
Channel model based factory automation wireless network ARQ retransmitting method Download PDFInfo
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Abstract
The invention relates to the industrial wireless network technology, in particular to a channel model based factory automation wireless network ARQ retransmitting method. The method is oriented to a star network of an IEEE 802.11 single-hop BSS structure, reduces difficulty for maintenance and management, improves the system flexibility, and meets the network real-time and reliable requirements as the method adopts a TDMA mechanism to support ordered transmission for retransmission data of large-scale network nodes in each TDMA time slot. The dynamic retransmission time slot reserving method based on a link layer channel model is adopted to ensure the reliability index, reduce the time and message overhead due to distribution of the retransmission communication resource and improve the communication resource utilization rate. Aggregated NACK and a resource distribution method based on ID value are utilized to obviously reduce the overhead due to ACK transmission and resource distribution information, and achieve high efficiency, low overhead, high possibility of implementing and the like.
Description
Technical field
The present invention relates to industry wireless network technology, specifically a kind of factory automation wireless network ARQ repeating method based on channel model.
Background technology
Industry wireless network technology is after fieldbus, another hot spot technology of industrial control field, being to reduce industry measurement and control system cost, improving the revolutionary technology of industry measurement and control system range of application, is also industrial automation coming years product new growth point.Industry wireless network technological side is to equipment room short distance, low rate information interaction, being adapted at severe industrial environment uses, there is the technical characterictics such as very strong antijamming capability, super low energy consumption, real time communication, be the Function Extension in commercial Application direction and technological innovation to existing wireless technology, and be finally converted into new wireless technology standard.At present, industry wireless network technology is applied to factory automation field at a high speed, becomes after the industry wireless network technology of procedure-oriented automation, in the world the another focus of radio network technique competition.With respect to traditional wired bus technology, factory automation wireless network not only has low cost, easily installs, the advantage of easy care, and can avoid equipment because of the mobile cable causing easily aging, cable pollute, the easy problem such as unsuccessfully of slip ring electric power contact.Yet factory automation has harsher requirement to wireless communication system: (1) high reliability, reliability reaches 99.99%; (2) high traffic rate, transmission rate is in the magnitude of Mbit/s; (3) high real-time, requires to postpone lower than 10ms; (4) large scale network, requires to support the number of nodes of 100 o'clock to 1000 o'clock.
Corresponding to the above-mentioned requirements of factory automation wireless network, IEEE 802.11 standard families, because its physical layer has the feature of high speed and the feature that single-hop networks has high real-time, become the first-selection of factory automation wireless network physical layer.Meanwhile, the feature that time-division multiple access (TDMA) (TDMA, Time Division Multiple Access) mechanism is distributed and effectively avoided conflict because of its deterministic resource, can realize higher reliability and real-time.And these high targets for factory automation require not enough, because compare the message transmissions of wireless link with wire link, there is larger uncertainty, by on-the-spot test in noiseless short-range environment, transmitted power is that the packet loss of IEEE 802.11 radio frequency chips of 20dBm is 0.2245%, and therefore a plurality of re-transmission time slots just need to be set reaches its reliability requirement.According to formula (1), each message at least needs 3 re-transmission time slots just can reach 99.99% reliability, and wherein P is the reliability after retransmitting for n time, P
epacket loss for single transmission.
High reliability and large scale network become conflict body in the wireless network of high real-time.If adopt the method that procedure-oriented automated network standard adopts at present such as WirelessHART, ISA100.11a, method for the re-transmission time slot of the reserved fixed number of each network equipment, need for a large amount of network equipments distribute a large amount of re-transmission time slots, thereby cause the excess waste of the communication resource.
HARQ (Automatic Repeat-reQuest, ARQ) technology is one of key technology guaranteeing in wireless communication system reliable data transmission, by the mode retransmitting, realize transmitting, be widely used in non-real-time data transmission system.
Traditional ARQ technology is one of error correcting agreement of data link layer in open system interconnection (Open System Interconnect, OSI) model.It confirms and overtime these two mechanism by use, if transmit leg is not received acknowledgement frame after transmission within a period of time, it will resend until it receives acknowledgement frame.Traditional ARQ technology is on the basis of unreliable service, to realize reliable communication, its for be message transmissions between transmitting terminal and single receiving terminal and the research of confirmation, and do not relate to the correlative study of the reliability index that reaches restriction in finite time, and the correlative study aspect the sending time slots resource distribution of data message and acknowledgement frame between transmitting terminal and a plurality of receiving terminal in TDMA network.Even more important is a bit in traditional ARQ, for each message, to carry out ACK to reply, if this method applies in the factory automation wireless network that number of nodes is larger, can because of between access point (Access Point, AP) and each website frequently ACK message transmissions waste a large amount of communication resources.Therefore and real-time high large for network size in factory automation wireless network, needs a kind of ARQ repeating method that is issued to the high efficiency of given reliability index, low expense in TDMA scheduling badly.
Under TDMA mechanism, the distribution of ARQ re-transmission time slot needs AP broadcast resource assignment message, when number of retransmissions is more, AP needs to allocate in advance Internet resources before every group retransmits time slot, and broadcast resource assignment message, this on the one hand can be for tdma system brings very large expense, and this time slot allocation frequently also cannot meet the requirement of factory automation network high real-time on the other hand.
Summary of the invention
For fault characteristic and the existing failure prediction method above shortcomings part of Digit Control Machine Tool, the technical problem to be solved in the present invention is to provide a kind of failure predication ability that can improve Digit Control Machine Tool complete machine or subsystem, strengthen prediction robustness, have applications well prospect based on fault tendency decision model and the dynamic fault of numerical control machine tool Forecasting Methodology of confidence level coupling.
The technical scheme that the present invention adopted is for achieving the above object: a kind of factory automation wireless network ARQ repeating method based on channel model, comprises the following steps: factory automation wireless network is set up into the Star Network based on IEEE 802.11 single-hop basic service structure sets; Access point AP, as resource allocator, is website distribution T DMA time slots all in network; AP distributes control information at first superframe time slot broadcast resource, and this resource distributes control information to divide superframe time slot for each website, retransmits time slot according to the reserved one section of continuous slot of the packet loss model of current channel as ARQ simultaneously; Each website distributes after control information in the resource of receiving AP broadcast, sends successively periodic process data message to AP in the communication time slot of self; After each website sending time slots finishes, AP statistics is not received the Site ID value of periodic process data message, it is arranged in certain sequence and is aggregated into negative response message, at next time slot, broadcasts this negative response message to each website; Each website is received after negative response message, negative response message is resolved, if negate, in response message, there is the ID value of self, according to ID value, putting in order in negative response message determined from the re-transmission timeslot number in reserved time slot, and sends data retransmission in corresponding timeslot number.
In described network, all websites comprise on-the-spot node and hand-held node.
Described website identifies by identifier.
It is n group continuous slot that described ARQ retransmits time slot, and every group of time slot is the re-transmission time slot of upper a group, and the continuous slot number of every group is m, and re-transmission group is counted the continuous slot of n and every group and counted m by the packet loss P of a upper super frame period
edefine:
(k is integer and 1≤k≤n) (2)
Wherein, the reliability index that α is network, m
1for sending periodic process data to the website number of AP end.
In described negative response message, the sequence of the ID value of website causes it cannot in this organizes reserved retransmission time period, obtain re-transmission time slot, the ID value of AP these websites of prioritization in upper once negative response message after leaning on.
Described packet loss model is:
Wherein, P
efor packet loss; In a super frame period, after the complete ARQ of website retransmits, AP upgrades packet loss P according to formula (3)
e.
Described periodic process data aggregate is in periodic data message, and periodic data message comprises frame control, sequence number, source address, destination address, ID value and periodic process data.
Described negative response message comprises frame control, sequence number, source address, destination address and load, and wherein, payload segment comprises that ID value the present invention of each website that needs retransmit has the following advantages:
Be in particular in:
1. the inventive method is towards the Star Network of IEEE 802.11 single-hop BSS structures, reduced on the one hand the difficulty of maintenance and management, improved the flexibility of system, it adopts TDMA mechanism to support the data retransmission of large-scale network node to transmit in order at each time slot of TDMA, while having met network implementation and requirement reliably;
2. ARQ method of the present invention adopts based on link layer channel model and dynamically reserves the method that retransmits time slot, by the confirmation of message transmissions, specify the not message of transmission success to retransmit, utilize the channel model of link layer to distribute re-transmission time interval resource to make reliability reach set quota, utilize the polymerization technique of NACK message significantly to reduce the expense of frequent transmission ACK message simultaneously, improved communication resources utilization ratio;
3. the present invention adopts polymerization NACK and according to the method for ID value Resources allocation, has significantly reduced the expense of being brought by transferring ACK and resource allocation information, has realized high efficiency, low expense and has been easy to the targets such as realization;
4. the present invention dynamically reserves ARQ according to link layer channel model and retransmits number of time slot, make AP reserve several groups of continuous time slots in first resource distributes, for ARQ, retransmit, to reach the reliability index of factory automation, be that first resource distribution just can complete a time slot allocation task in super frame period, the utilance that can save Internet resources when reaching reliability index.
Accompanying drawing explanation
Fig. 1 is the factory automation wireless network topology figure based on IEEE 802.11 single-hop networks in the present invention;
Fig. 2 is slot reservation exemplary plot when the ARQ based on channel model retransmits in the present invention;
Fig. 3 is the retransmission processes figure of single website in super frame period in the present invention;
Fig. 4 is the frame format figure of periodic process data in the present invention;
Fig. 5 is NACK frame format figure in the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
The inventive method comprises the following steps:
Factory automation wireless network is set up into the Star Network based on IEEE 802.11 single-hop Basic Service Sets (Basic Service Station, BSS) structure, as shown in Figure 1, realize the factory automation wireless network ARQ repeating method based on channel model.
AP, as resource allocator, is website all in network (comprising field apparatus and handheld device) distribution T DMA time slot; Various kinds of equipment identifies by identifier (ID, Identifier);
AP distributes control information at first superframe time slot broadcast resource, this control information is responsible for each website and divides superframe time slot, according to the reserved n group of the packet loss model of current channel continuous slot, as ARQ, retransmit time slot simultaneously, make each data have n chance to retransmit, so that the reliability of wireless network transceiving data reaches the technical indicator of regulation, here the reliability index of network is made as α, and re-transmission group is counted the continuous slot of n and every group and counted m by the packet loss P of a upper super frame period
edefine, the packet loss mode input of channel is P
e, be output as re-transmission group and count the continuous slot of n and every group and count m.Setting up of model is as follows.
Formula 1 is for to define re-transmission group number by channel packet loss, and formula 2 is for to define every group of continuous slot number by channel packet loss, wherein m
1for sending periodic process data to the website number of AP end.Reserved example as shown in Figure 2;
Receive that after the resource distribution control information of AP, website sends periodic process data message successively to AP in the communication time slot of self;
Each website sending time slots finishes the ID value that rear AP statistics is not received the website of message, and a message is arranged and aggregated into the ID value that each is sent to failed website in certain sequence, and broadcast this negative response (Negative Acknowledgement at next time slot, NACK) message, if cause it cannot obtain re-transmission time slot, the ID value of AP these websites of prioritization in upper once NACK in this organizes reserved retransmission time period because retransmitting after the ID value sequence of website is leaned on.The retransmission processes of single website in super frame period as shown in Figure 3.
Each website is received after NACK, and NACK message is resolved, if there is the ID value of self in NACK, the putting in order in message according to ID value, determines from the re-transmission timeslot number in reserved time slot, and send data retransmission in corresponding timeslot number; According to above-mentioned steps, in a super frame period, after the complete ARQ of website retransmits, AP upgrades packet loss P according to formula 3
e.
Periodic process data aggregate is in periodic data message, and described periodic data message comprises frame control, sequence number, source address, destination address, ID value and periodic process data, as shown in Figure 4.
Negative response message comprises frame control, sequence number, source address, destination address and load, and wherein, payload segment comprises the ID value of each website that needs retransmit, as shown in Figure 5.
Embodiment:
As reached 99.99% reliability index in the factory automation wireless network at 100 websites, establish packet loss P
ebe 10%, the channel model of setting up by packet loss arranges the continuously reserved timeslot number of re-transmission group number and every group, and re-transmission group is counted n>=2, gets n=2 here.Reserve continuously timeslot number m for first group
1>=10, get 10 here; Reserve continuously timeslot number m for second group
2>=1, get 2 here.
Each website is all with No. ID sign, and after periodic process transfer of data completes, AP sends nack message to each website, and each website extracts all ID value informations wherein.For example the ID value in NACK is 2,11,14,19,23,27,46,57,82,90,95.First AP arranges the ID value in NACK, finds that the website that ID value is 95 cannot send data in next organizes reserved re-transmission time slot, the AP website that prioritization ID value is 95 in the reserved time slot of next group.Each website is sequentially chosen re-transmission timeslot number according to ID value, the website that for example ID value is 90 determines that it is at the tenth after arranging ID value, it sends data by organizing at next in reserved re-transmission time slot in the tenth re-transmission time slot, and the website that ID value is 95 determines that it is at the 11 after arranging ID value, cannot in next organizes reserved re-transmission time slot, send data, it will abandon this re-transmission.
After first group of re-transmission finishes, AP again adds up packet loss information and sends NACK to each website, and for example the ID value in NACK is 95,2.ID value is that 95 website preferentially sends data retransmission, and the website that ID value is 2 sends data retransmission thereafter.
Last AP adds up the packet loss in this super frame period:
Claims (8)
1. the factory automation wireless network ARQ repeating method based on channel model, is characterized in that, comprises the following steps: factory automation wireless network is set up into the Star Network based on IEEE 802.11 single-hop basic service structure sets; Access point AP, as resource allocator, is website distribution T DMA time slots all in network; AP distributes control information at first superframe time slot broadcast resource, and this resource distributes control information to divide superframe time slot for each website, retransmits time slot according to the reserved one section of continuous slot of the packet loss model of current channel as ARQ simultaneously; Each website distributes after control information in the resource of receiving AP broadcast, sends successively periodic process data message to AP in the communication time slot of self; After each website sending time slots finishes, AP statistics is not received the Site ID value of periodic process data message, it is arranged in certain sequence and is aggregated into negative response message, at next time slot, broadcasts this negative response message to each website; Each website is received after negative response message, negative response message is resolved, if negate, in response message, there is the ID value of self, according to ID value, putting in order in negative response message determined from the re-transmission timeslot number in reserved time slot, and sends data retransmission in corresponding timeslot number.
2. a kind of factory automation wireless network ARQ repeating method based on channel model according to claim 1, is characterized in that, in described network, all websites comprise on-the-spot node and hand-held node.
3. a kind of factory automation wireless network ARQ repeating method based on channel model according to claim 1 and 2, is characterized in that, described website identifies by identifier.
4. a kind of factory automation wireless network ARQ repeating method based on channel model according to claim 1, it is characterized in that, it is n group continuous slot that described ARQ retransmits time slot, every group of time slot is the re-transmission time slot of upper a group, the continuous slot number of every group is m, and re-transmission group is counted the continuous slot of n and every group and counted m by the packet loss P of a upper super frame period
edefine:
(n is integer and n>=1) (1)
Wherein, the reliability index that α is network, m
1for sending periodic process data to the website number of AP end.
5. a kind of factory automation wireless network ARQ repeating method based on channel model according to claim 1, it is characterized in that, in described negative response message, the sequence of the ID value of website causes it cannot in this organizes reserved retransmission time period, obtain re-transmission time slot, the ID value of AP these websites of prioritization in upper once negative response message after leaning on.
6. a kind of factory automation wireless network ARQ repeating method based on channel model according to claim 1, is characterized in that, described packet loss model is:
Wherein, P
efor packet loss; In a super frame period, after the complete ARQ of website retransmits, AP upgrades packet loss P according to formula (3)
e.
7. a kind of factory automation wireless network ARQ repeating method based on channel model according to claim 1, it is characterized in that, described periodic process data aggregate is in periodic data message, and periodic data message comprises frame control, sequence number, source address, destination address, ID value and periodic process data.
8. a kind of factory automation wireless network ARQ repeating method based on channel model according to claim 1, it is characterized in that, described negative response message comprises frame control, sequence number, source address, destination address and load, wherein, payload segment comprises the ID value of each website that needs retransmit.
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