CN100401705C - Wired local network analog platform construction method of mobile radio self-organizing network - Google Patents
Wired local network analog platform construction method of mobile radio self-organizing network Download PDFInfo
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Abstract
The present invention relates to a method by utilizing a wired local area network of a mobile wireless ad hoc network to simulate a platform component. The present invention aims to solve the problem of difficult debugging of a software protocol stack of the mobile wireless ad hoc network, and simulates a hardware platform of the mobile ad hoc network in the wired local area network, and thus, the problem of difficult debugging of the protocol stack is solved. The simulation platform is arranged in the wired network environment, equivalent and wireless nodes of the wireless ad hoc network are composed of a host machine and a plurality of customer mechanisms in the wired network, and the mobile wireless ad hoc network is formed by a method for simulating the platform host machine and simulating the platform client. The communication protocol of the mobile wireless ad hoc network is developed on the platform, and thus, the present invention is convenient to transplant to the hardware, brings maximum convenience for the debugging, greatly accelerates the development cycle, and simultaneously decreases the debugging difficulty.
Description
Technical field
What the present invention relates to is the wireless data communication network construction method, specifically is a kind of local area network (LAN) analog platform method of the mobile wireless ad hoc networks of debugging the protocol stack of mobile wireless ad hoc networks network and making up.
Background technology
The mobile wireless ad hoc networks network has following particularity with respect to cable network following on some:
1, on physical layer, because radio signal power is limited, its communication coverage is limited, and promptly equipment node that can only communicate with in the scope communicates.Node beyond its communication range can only carry out data passes by the mode of multi-hop.
2, at MAC (Media Access Control, medium access control) layer may have a plurality of wireless devices access channel simultaneously, causes conflict mutually between the grouping, makes receiver can't differentiate the data that receive, cause the channel resource waste, throughput significantly descends.In order to address these problems, just need the MAC agreement.This agreement mainly by one group of rule and process come more effective, use shared medium in order and liberally.
3, mobile Ad hoc net is a kind of cordless communication network of distribution, its maximum characteristics do not have network infrastructure exactly, constitute network by some mobile nodes fully temporarily, and after node motion, network topology structure change, can promptly set up new transmission channel, most of mobile nodes all need to possess routing function.
4, the transmission control protocol in the internet (TCP) is one of most popular agreement in the end-to-end transmission of present cable network.But because TCP is at wired fixed network originally, in strategies such as current control and congested control and reckon without gap on Radio Link and the wire link propagation delay time, and because the influence that the mobility of mobile Ad hoc network is brought network, so traditional Transmission Control Protocol can not be directly used in Ad hoc network.
Realize the design of Platform of mobile wireless ad hoc networks, except that the circuit and corresponding software driver of physical layer hardware part, most important is exactly realization to MAC layer, network route, transport layer and mutually deserved application layer protocol.For example there are some simulation softwares at present: NS2, OPNET etc., these softwares have powerful model library, in the large-scale procotol of debugging, be absolutely necessary during with theoretical research, but these softwares are to support C++ mostly, Tcl, senior language such as Proto-C, and most of these softwares all are commercial.If we will realize the radio protocol stack of theory on hardware, mobile wireless ad hoc networks particularly, because the resource-constrained of its individual node, the compiler of its hardware platform can not be supported the employed high-level programming language of these simulation softwares, only supports rudimentary programming language in assembler language and the C language etc. mostly.That is to say in our protocol with hardware implementation procedure the problem that has a transplanting, in migration process, also have some practical problems to occur, particularly following problems can appear in the implementation procedure for the protocol stack of software section:
1, in the build process of platform, often hardware and software need be debugged synchronously, but the software of wireless network is for being operated on the hardware platform, parts such as link layer, network layer and transport layer in the protocol stack particularly, if there is not hardware platform, only good software section program composition on the PC platform, carry out stand-alone debugging, often can only find out wherein about the mistake of aspects such as program syntax, be difficult to find some in logic or the mistake on the algorithm.This has just formed software need wait for that hardware development is finished and perfect contradiction, if contradiction is not resolved the problem that will cause the construction cycle to prolong.
2, in debugging during wireless protocols, particularly during the agreement of wireless self-networking, because the equality of each node often needs during debugging the state of a plurality of nodes is followed the tracks of the problem that just can find protocol stack simultaneously.But in actual debug process, the finiteness of quantity such as (as simulator) often can not be accomplished because adjusting instrument, if this moment, intermediate node went wrong, will cause the difficulty of debugging.
3, when realizing the multi-hop function of wireless self-networking, in the process of debugging, destination node and sending node often need separated by a distance, and the debugging actual working environment (as the laboratory) all this distance within, so just there be the situation of debugging node beyond operational environment, the debugging of so this node may be subjected to the influence of factors such as non-transformer out of doors, and increases the inconvenience of debugging software agreement.
Summary of the invention
The objective of the invention is to problem at the prior art existence, a kind of cable LAN analog platform construction method of mobile wireless ad hoc networks network is provided, this analog platform has the particularity of above-mentioned mobile wireless ad hoc networks network, for upper-layer protocol stack software provides excellent interface, the transmission of each node bag of may observe receives situation, thereby is convenient to debug protocol stack sofeware and is transplanted on the hardware platform.
In order to achieve the above object, the present invention adopts following technical proposals:
A kind of cable LAN analog platform construction method of mobile wireless ad hoc networks network, it is characterized in that in the cable LAN environment, adopt the analog platform main frame in the wired local area network and the mode construction mobile wireless ad hoc networks network of Duo Tai analog platform client computer.Described analog platform main frame provides agreement debugging person to carry out the setting of network parameter, and network parameter is sent to the client computer of analog platform; When node motion, need to calculate the different position coordinateses constantly of mobile node, and send other client computer to, in addition, also needing provides synchronised clock to other client computer; Described analog platform client computer is a plurality of nodes in the artificial antenna ad-hoc network, and simulate a plurality of nodes from moving process.In the cable LAN analog platform of above-mentioned mobile wireless ad hoc networks network, the concrete operations step of described analog platform main frame:
Step 1: wait for that the user sets the parameter of configuration of this machine and network before debugging, and carry out the user of the concrete user's input information of initial work and use the importation in the interface that detailed appointment is arranged in the back;
Step 2: periodically all nodes transmit regularly each node real time position coordinate information in synchronised clock and the wireless network in network;
Step 3: investigation has or not mobile node;
Step 4: calculate this positional information constantly of mobile node according to uniform rectilinear motion model, and upgrade institute's all node location information tables of the wireless network of store, prepare against in the step 2 that all each node real time position coordinate informations of nodes transmission wireless network can upgrade in network;
Step 5: according to all node location informations in the wireless network, investigate other node whether at this machine node with from as the center, but but the maximum communication distance is a method in the border circular areas of radius calculates all neighbor node addresses of this machine node direct communication;
Step 6: whether have packet to arrive on the inquiry wired local area network;
Step 7: if there is packet to arrive, then packet enters the packet receiving processing module, this module idiographic flow has detailed decomposition in Fig. 6, finally this module is filtered the packet on the network, and the packet that satisfies true wireless network environment is sent to upper-layer protocol;
Whether step 8: investigating upper-layer protocol has packets need to send;
Step 9: when upper-layer protocol has packets need to send, call the wireless data packet sending module, carry out package and data are sent to other nodes in the local area network (LAN);
Step 10: some timer conters that need in the analog platform to consider are handled, mainly comprised timed sending sync packet counter, timed sending positions of mobile nodes information counter, CCA counter.
In the cable LAN analog platform of mobile wireless ad hoc networks network, the concrete operations step of described analog platform client computer:
Step 1: the request network host transmits network configuration information.This process can prevent repetition fan-in network configuration information on every machine;
Step 2: wait for that network host transmits network configuration information, and carry out initial work;
Step 3: whether the requester network main frame packet of delivery time sync packet and each node location information of wireless network;
Step 4: clock and all node location informations of wireless network of upgrading this machine;
Step 5: according to all node location informations in the wireless network, investigate other node whether at this machine node with from as the center, but but the maximum communication distance is a method in the border circular areas of radius calculates all neighbor node addresses of this machine node direct communication;
Whether step 6: have packet to arrive on the requester network port, if there is packet to enter TCP or UDP message receiver module, this module is filtered this packet, and the packet that satisfies true wireless network environment is sent to upper-layer protocol;
Whether step 7: investigating upper-layer protocol has packets need to send;
Step 8: when upper-layer protocol has packets need to send, call the wireless data packet sending module, carry out package and data are sent to other nodes in the local area network (LAN).
The present invention has following conspicuous outstanding substantive distinguishing features and remarkable advantage compared with prior art.The cable LAN analog platform of the mobile wireless ad hoc networks network that method provided by the invention is constructed has following function:
1, has CCA (clear channel assessment, the channel idle assessment) function of radio communication road packet collisions mechanism and wireless sending module, can utilize this characteristics tune-up data link layer protocol stack.
2, have wireless channel neighborhood receiving function, each node can only receive the node grouping data of its territory, and supports the wireless unidirectional transfer function, has simulated actual wireless environment.
3, support the locomotive function of multinode, mobility model is a linear uniform motion, simulation mobile network characteristic, thus support the upper strata to debug the protocol stack of mobile ad hoc network.
4, the good transmission and the interface function of reception bag are provided for the upper-layer protocol stack.
By writing the mobile wireless ad hoc networks network environment of corresponding software simulation reality under the multi-machine surroundings in local area network (LAN).The agreement of wireless self-networking protocol stack developer more than the mutually deserved physical layer of exploitation on the basis of this platform comprises MAC (Media Access Control, medium access control) agreement, network routing protocol, transport layer protocol, application layer protocol etc.Develop user's development agreement stack on the local area network (LAN) analog platform of mobile wireless ad hoc networks network of hardware based wireless self-networking agreement, can significantly reduce construction cycle and difficulty with these functions.
Description of drawings
Fig. 1 simulates the status of mobile wireless ad hoc networks in software protocol.
The process of Fig. 2 analog platform receiving data packets.
Overall process when Fig. 3 analog platform receives data.
Network host workflow in Fig. 4 analog platform.
Network subordinate workflow in Fig. 5 analog platform.
The TCP in Fig. 6 analog platform overall procedure or the concrete handling process of UDP receiver module.
Scanning receives the concrete handling process of buffering area in Fig. 7 analog platform overall procedure
Fig. 8 analog platform message header structure.Wherein the implication of each is as follows in the message:
Destination node IP address: the purpose IP address of the recipient of this bag correspondence in local area network (LAN), the address is
Show during 0xFFFFFFFF that this bag is a broadcast packet.
Source node IP address: the IP address of the transmit leg of this bag correspondence in local area network (LAN)
Channel number: this wraps in employed channel number in the wireless channel, 255 channels of maximum support
The bag type: the data field type of this bag is 0 to be packet, is 1 to be controlling packet
Bottom transmission mode sign: the sign bottom adopt transmission mechanism, be 1 to use the UDP transmission, be 2 to use TCP
Transmission can be expanded other communication modes.
Bag transmitting time: the time that needs busy channel after this bag sends
Transmitting time is stabbed: the time when bag sends
Time of reception stabs: the time when bag receives
Embodiment
A case study on implementation of the present invention is auspicious in conjunction with the accompanying drawings state as follows:
The user can carry out the debugging of protocol stack on the mobile wireless ad hoc networks platform of the simulation of following structure.This analog platform is made of main frame in the wired local area network and Duo Tai client computer, and the user loads the software protocol program of self respectively on main frame and in the software of client computer.Residing status is as shown in Figure 1 in the protocol stack sofeware of user debugging for whole platform, the wireless software protocol stack debugging person that mobile wireless ad hoc networks analog platform software section offers debugging uses, all finally will be transferred to the parsing that the packet in the wireless channel wraps through the analysis module of this analog platform in the protocol stack, finally transmit in cable LAN with the form of TCP/IP bag.
Simulation mobile wireless ad hoc networks platform provides the wireless channel data to send for the upper-layer protocol stack and receives two interfaces, is the process when the upper-layer protocol stack need be sent to other nodes of wireless network to data message as shown in Figure 2.The analog platform software section is transferred to other nodes after providing interface function that the packet of upper-layer protocol stack is packed according to the packet format among Fig. 8.This interface function need detect the upper-layer protocol stack and whether consider that CCA detects transmission, judge whether channel is idle if need then detect the CCA counter of analog platform and whether be zero, use upper-layer user's MAC layer host-host protocol to send data, this function mainly offers the user and develops the mac-layer protocol stack.
When node of analog platform is received when LAN sends packet, its deal with data packet procedures as shown in Figure 3, analog platform receives the software module of a TCP/IP packet process analog platform on the network and handles, write down the message that is transmitted on the one hand, only satisfactory message is sent to the upper-layer protocol stack on the other hand.
The interior main frame of analog network platform mainly offers agreement debugging person and carries out the setting of network parameter, and network parameter sent to other client computer, when node motion, need to calculate the position coordinates in the different moment of mobile node and send other client computer to, needing in addition provides synchronised clock to other client computer.Its inner concrete workflow as shown in Figure 4.
S4-1: wait for that the user sets the parameter of configuration of this machine and network before debugging, and carry out the user of the concrete user's input information of initial work and use the importation in the interface that detailed appointment is arranged in the back.
S4-2: periodically all nodes transmit regularly each node real time position coordinate information in synchronised clock and the wireless network in network.
S4-3: investigation has or not mobile node.
S4-4: calculate this positional information constantly of mobile node according to uniform rectilinear motion model, and upgrade institute's all node location information tables of the wireless network of store, prepare against among the S4-2 that all each node real time position coordinate informations of nodes transmission wireless network can upgrade in network.
S4-5: according to all node location informations in the wireless network, investigate other node whether at this machine node with from as the center, but but the maximum communication distance is a method in the border circular areas of radius calculates all neighbor node addresses of this machine node direct communication.
S4-6: whether have packet to arrive on the inquiry wired local area network.
S4-7: if there is packet to arrive, then packet enters the packet receiving processing module, this module idiographic flow has detailed decomposition in Fig. 6, finally this module is filtered the packet on the network, and the packet that satisfies true wireless network environment is sent to upper-layer protocol.
Whether S4-8: investigating upper-layer protocol has packets need to send.
S4-9: when upper-layer protocol has packets need to send, call the wireless data packet sending module, carry out package and data are sent to other nodes in the local area network (LAN).
S4-10: some timer conters that need in the analog platform to consider are handled, mainly comprised timed sending sync packet counter, timed sending positions of mobile nodes information counter, CCA counter etc.
The net computer main purpose of analog platform is for a plurality of nodes in the artificial antenna MANET, and simulate a plurality of nodes from moving process, its internal work flow process is as shown in Figure 5.
S5-1: the request network host transmits network configuration information.This process can prevent repetition fan-in network configuration information on every machine.
S5-2: wait for that network host transmits network configuration information, and carry out initial work.
S5-3: whether the requester network main frame packet of delivery time sync packet and each node location information of wireless network.
S5-4: clock and all node location informations of wireless network of upgrading this machine.
S5-5: calculate all neighbor nodes of this machine node according to all node location informations.Method is consistent with method in the S4-5.
S5-6: whether have packet to arrive on the requester network port, if enter TCP or UDP message receiver module, this module idiographic flow has detailed decomposition in Fig. 6, finally this module is filtered the packet on the network, and the packet that satisfies true wireless network environment is sent to upper-layer protocol.
Whether S5-7: investigating upper-layer protocol has packets need to send.
S5-8: when upper-layer protocol has packets need to send, call the wireless data packet sending module, carry out package and data are sent to other nodes in the local area network (LAN).
All have in the data flow of main frame and client computer when having data to arrive in inquiring network, enter packet handing module, the specific implementation flow process of this module as shown in Figure 6.
S6-1: inquire by socket whether the data arrival is arranged on the network.
S6-2: inquiry packet header, judge whether to be wireless data packet, whether be the packet that need send into the upper strata just.
S6-3: be wireless data packet, whether the source address of resolving this bag is its neighbor node, because each node can only receive the node data bag in its neighbours' scope, in addition, if support the one-way transmission function, need whether the destination address of this bag of detection is broadcast packet, if not broadcast packet, just need whether the destination address of this bag of inquiry is this machine, if be not this machine then handle as erroneous packets equally.
S6-4: in buffer queue, search the message that whether has same channel confliction, be to stab by the transmitting time in the analog platform software packet header to compare herein, the message that same channel indicates, transmitting time is stabbed only to be separated by and just can be judged to be nothing conflict message during blanking time greater than the maximum channel packet collisions, misrepresents deliberately the literary composition processing otherwise make.
S6-5: for the message of not makeing mistakes, can not give the upper-layer protocol stack at once, must be cached to and receive in the buffering area, and set life span (equal current time add maximum channel packet collisions blanking time), the purpose of this measure is the problem that bag that anti-bag here and back send clashes.
S6-6: enter scanning buffer formation module, the buffer queue processing module has detailed introduction in Fig. 7, and this module is mainly finished, and the wireless data packet of realistic wireless environment in the buffer queue is sent in the upper-layer protocol.
S6-7: the message for makeing mistakes, output to error file, be used to write down error message information.
S6-8: all messages of clashing of deletion, comprise firm receipts message and and the buffering formation in all messages of clashing.
S6-9: judge whether what receive from network is the sync packet of analog platform.
S6-10: judge whether what receive from network is the request network configuration packet.
S6-11:, then transmit the network configuration information bag to network if receive the request network configuration packet.Mainly provide to network host and use.
S6-12: judge whether what receive from network is the network configuration information bag that main frame transmits.
S6-13: if receive the network configuration information bag, this node then reconfigures the network information.Mainly provide to network subordinate and use.
S6-14: after receiving sync packet, need fair copy machine clock.
In above step, relate to the processing procedure of the buffering area that receives bag, this process mainly is in order to simulate channel frame data collision mechanism in the actual wireless ad-hoc network, the data wireless links bag of just having received can not be sent to upper-layer protocol at once and handle, and the buffer memory certain hour to prevent that subsequent packet is to this packet conflict.Its specific implementation mechanism as shown in Figure 7.
S7-1: the packet of each inside the scanning buffer formation.
S7-2: whether each message life span of inquiring about each scanning arrives.
S7-3: the life span of this bag arrives, removes the analog platform interface packet header of this bag.
S7-4: this bag of deletion in buffering area, and call receiver function this bag is sent to the upper-layer protocol stack.
S7-5: judge whether to have scanned messages all in the buffering area.
Because this platform be framework in wired local area network, the packets need of protocol stack is carried out the whole then data division transmission as the TCP/IP bag of packing data by the software module of this platform.Fig. 8 is the specifying information of analog platform software module to data packing back heading.
The resource that need safeguard of local node has in addition: the channel number of support and channel packet conflict time, the node address correspondence table in this machine LAN IP address and the simulation mobile wireless network, data transfer mode, synchronous time counter.
The user uses interface:
The importation:
1, the mapping relations of node address and this machine IP address in the mobile wireless ad hoc networks of setting simulation are promptly imported the address of this machine in mobile wireless ad hoc networks.
But 2, import at any time or change each node direct communication node address, thereby but set nodes in communication address in the jumping scope.
3, setting is manually or automatically to change node one to jump communication node, realizes the mobility of node in the wireless environment.
4, set each channel packet and conflict blanking time, because the wireless network physical layer architecture is inequality, the characteristic of packet collisions is not a unanimity.
5, select the wireless transmission type of supporting, comprise being to use TCP to transmit with UDP, the bottom that can be chosen in analog platform adopts the UDP mode to transmit data.
The interface that provides for upper-layer protocol stack software has:
1, provides the transmission function, u_int8_t packet_transfer (struct Packet*p, int type, void (* MacTran) ()); This function calls when needs send to physical layer to grouping for the protocol stack of debugging.
2, receive the message processing function pointer, in analog platform, having the function pointer of global variable to be used to handle received bag void (* p_do_receive_packet) (struct Packet*p); When using this mobile wireless platform, the protocol stack receiver function pointer assignment of debugging is got final product for this variable.
4, deposit the package informatin that all received in the file ReceiveData.txt, deposit destination address in the package informatin, source address, transmitting time, whether time of reception, this machine information such as receive, and debugging person's phase-split network bag transmission situation is provided.
Claims (1)
1. the cable LAN analog platform construction method of a mobile wireless ad hoc networks network, it is characterized in that in the cable LAN environment, adopt the analog platform main frame in the wired local area network and the mode construction mobile wireless ad hoc networks network of Duo Tai analog platform client computer;
Described analog platform main frame provides agreement debugging person to carry out the setting of network parameter, and network parameter is sent to the client computer of analog platform; When node motion, need to calculate the different position coordinateses constantly of mobile node, and send other client computer to, in addition, also needing provides synchronised clock to other client computer;
Described analog platform client computer is a plurality of nodes in the artificial antenna ad-hoc network, and simulate a plurality of nodes from moving process;
The concrete operations step of described analog platform main frame is as follows:
Step 1: wait for that the user sets the parameter of configuration of this machine and network before debugging, and carry out initial work;
Step 2: periodically all nodes transmit regularly each node real time position coordinate information in synchronised clock and the wireless network in network;
Step 3: investigation has or not mobile node;
Step 4: calculate this positional information constantly of mobile node according to uniform rectilinear motion model, and upgrade institute's all node location information tables of the wireless network of store, prepare against in the step 2 that all each node real time position coordinate informations of nodes transmission wireless network can upgrade in network;
Step 5: according to all node location informations in the wireless network, investigate other node whether at this machine node with from as the center, but but the maximum communication distance is a method in the border circular areas of radius calculates all neighbor node addresses of this machine node direct communication;
Step 6: whether have packet to arrive on the inquiry wired local area network;
Step 7: if there is packet to arrive, then packet enters the packet receiving processing module, and this module is filtered the packet on the network, and the packet that satisfies true wireless network environment is sent to upper-layer protocol;
Whether step 8: investigating upper-layer protocol has packets need to send;
Step 9: when upper-layer protocol has packets need to send, call the wireless data packet sending module, carry out package and data are sent to other nodes in the local area network (LAN);
Step 10: some timer conters that need in the analog platform to consider are handled, mainly comprised timed sending sync packet counter, timed sending positions of mobile nodes information counter, CCA counter;
The concrete operations step of described analog platform client computer is as follows:
Step 1: the request network host transmits network configuration information;
Step 2: wait for that network host transmits network configuration information, and carry out initial work;
Step 3: whether the requester network main frame packet of delivery time sync packet and each node location information of wireless network;
Step 4: clock and all node location informations of wireless network of upgrading this machine;
Step 5: according to all node location informations in the wireless network, investigate other node whether at this machine node with from as the center, but but the maximum communication distance is a method in the border circular areas of radius calculates all neighbor node addresses of this machine node direct communication;
Whether step 6: have packet to arrive on the requester network port, if enter TCP or UDP message receiver module, this module is filtered the packet on the network, and the packet that satisfies true wireless network environment is sent to upper-layer protocol;
Whether step 7: investigating upper-layer protocol has packets need to send;
Step 8: when upper-layer protocol has packets need to send, call the wireless data packet sending module, carry out package and data are sent to other nodes in the local area network (LAN).
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| CN107786684B (en) * | 2017-09-28 | 2020-10-16 | 中南林业科技大学 | Simulation method of mobile ad hoc network address automatic allocation protocol in NS2 |
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| US20040117747A1 (en) * | 2002-12-16 | 2004-06-17 | Chen Liang T. | Method for providing cycle-by-cycle ad hoc verification in a hardware-accelerated environment |
| US20040128543A1 (en) * | 2002-12-31 | 2004-07-01 | International Business Machines Corporation | Method and system for morphing honeypot with computer security incident correlation |
| WO2004098126A1 (en) * | 2003-05-01 | 2004-11-11 | Koninklijke Philips Electronics N.V. | An ad-hoc network, a network device and a method of configuration management therefor |
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| US20040117747A1 (en) * | 2002-12-16 | 2004-06-17 | Chen Liang T. | Method for providing cycle-by-cycle ad hoc verification in a hardware-accelerated environment |
| US20040128543A1 (en) * | 2002-12-31 | 2004-07-01 | International Business Machines Corporation | Method and system for morphing honeypot with computer security incident correlation |
| WO2004098126A1 (en) * | 2003-05-01 | 2004-11-11 | Koninklijke Philips Electronics N.V. | An ad-hoc network, a network device and a method of configuration management therefor |
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