CN103841523A - Information transmission method for conducting Wi-Fi message length based on multicast physical address - Google Patents
Information transmission method for conducting Wi-Fi message length based on multicast physical address Download PDFInfo
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Abstract
The invention discloses an information transmission method for conducting a Wi-Fi message length based on a multicast physical address. The information transmission method is characterized in that transmitted information is represented as the multicast physical address in an IEEE802.11 data package, a UDP is adopted as a protocol for data sending, one or more Wi-Fi off-net devices in a Wi-Fi network are used for transmitting a UDP data package for transmitting the information, a receiver recombines the received data package after analyzing the data package, and the transmitted information is accurately restored. Compared with the prior art, the information transmission method has the advantages that current Wi-Fi network connection of a data sender is not affected, data are sent to a plurality of devices outside the Wi-Fi network at the same time, information transmission can be conducted between two Wi-Fi devices needing communication without establishing a network on the basis that a Wi-Fi standard communication protocol is not changed, the information transmission method can also be applied to devices in other encrypted wireless networks for sending data to devices outside the encrypted wireless networks, and the data package can also be forwarded by a double-frequency wireless router without being limited by the wireless frequency band used by the sender.
Description
Technical field
The present invention relates to wireless communication technology field, especially a kind of multicast physical address based on IEEE 802.11 agreements carries out the information transferring method of Wi-Fi message length.
Background technology
Wi-Fi wireless communication technique has obtained application very widely in computer, smart mobile phone and panel computer field, along with the progressively development of technology of Internet of things, various types of embedded computer systems, as transducer, toy, Medical Devices etc., have brought into use Wi-Fi technology to realize wireless network communication and the Internet access.Wi-Fi network uses shared network media, and the equipment that only has same network title and data encryption mode can communicate with one another.But people but usually need the equipment transfering data outside Wi-Fi network, such as, send networking information to the equipment that does not add current Wi-Fi network, make them can add network, and transfer of data in directly netting by Wi-Fi cannot realize.This is because the data in the packet transmitting in most of Wi-Fi net are encrypted, the net external equipment that does not obtain key cannot normally be resolved, and the transmission of Wi-Fi packet is transmitted according to the network address, equipment outside network can not obtain the legal network address, so packet can not be delivered to these equipment by general mode.
Prior art generally adopts increases other communication apparatus or building network, realizes the communication with Wi-Fi net external equipment.As adopt bluetooth greatly to increase the cost of equipment, although building network can not increase cost of equipment, but operate very loaded down with trivial details, it need to disconnect the Wi-Fi network of current use the rear equipment networking with needing communication, then will after transfer of data, again recover original Wi-Fi network, the transfer of data of current normal use Wi-Fi network is interrupted completely.
Summary of the invention
The object of the invention is a kind of information transferring method that carries out Wi-Fi message length based on multicast physical address designing for the deficiencies in the prior art, the information of needs transmission is represented with the multicast physical address in IEEE 802.11 packets, the agreement that adopts UDP to send as data, utilize Wi-Fi network to send UDP message bag to more than one Wi-Fi net external equipment and carry out the transmission of information, recipient becomes the sequence number in whole transmission data to reconfigure the multicast physical address translations of reception, accurately restore the information of transmission, non-encrypted part with IEEE 802.11 multicast packets is carried out the transmission of data, multicast packets is had any different in the obvious characteristic of other packets, reduce the difficulty that recipient identifies Wi-Fi message, thereby make the data of transmitting not added the equipment of same Wi-Fi network to identify and receive reliably by other, do not changing on the basis of Wi-Fi standard communications protocol IEEE 802.11, two Wi-Fi equipment that make to need communication not building network just can carry out communication by the equipment sending data outside multiple Wi-Fi networks, connect and do not affect the current Wi-Fi network of data receiver, utilize wireless router multicast packets can be forwarded to all Wi-Fi frequency ranges, break through the restriction that common wireless telecommunications recipient can only use with transmit leg same radio band, also the equipment in the wireless network of other encryptions of can be applicable to is to the equipment sending data outside network, very easy to use.
The object of the present invention is achieved like this: a kind of information transferring method based on multicast physical address and Wi-Fi message length, be characterized in the multicast physical address in IEEE 802.11 packets to represent the information of transmission, represent the position of data with data segment, length in UDP message, adopting UDP is the agreement that data send, utilize Wi-Fi network to send Wi-Fi message to more than one Wi-Fi net external equipment and carry out the transmission of information, the packet receiving and resolve is reconfigured to rear reconstruct initial data, and its concrete operation step is as follows:
(1), build multicast IP address
In the byte of initial data, add and represent after the byte of data length as transmission data, adopt in IPv4 D class address for multicast to the unified multicast IP address sequence of transmission data construct; Described D class address realm is: 224.0.0.0 ~ 239.255.255.255; Described multicast IP address is: IPByte1.IPByte2.IPByte3.IPByte4;
(2), build UDP multicast packets
Take multicast IP address as destination address, be the packet that data packet length builds one group of UDP multicast message by the sequence number of multicast IP address;
(3), the transmission of packet
Multicast IP address transition is become to the multicast physical address of IEEE 802.11 packets, adopt the ICP/IP protocol stack of computer system that the packet of above-mentioned UDP multicast message is sent with Wi-Fi less radio-frequency by IEEE 802.11 network interfaces; Described physical address is: Byte1-Byte2-Byte3-Byte4-Byte5-Byte6; Described multicast IP presses Byte1=0x01 in address; Byte2=0x00; Byte3=0x5e; Byte4=IPByte2 & 0x7f; Byte5=IPByte3; Byte6=IPByte4 converts the multicast physical address of IEEE 802.11 packets to; Packet length=UDP message packet length+UDP Header (8)+IP Header (20)+MAC Base Header (24)+FCS (4)+MAC Extra Length of described IEEE 802.11 packets;
(4), the reception of packet and parsing
Recipient monitors in order each Wi-Fi frequency range and obtains data, receive and resolve all packets in IEEE 802.11 frequency ranges, obtain the multicast packets in the radio band of transmission and this frequency range, be that fixing feature is filtered IEEE 802.11 multicast packets of obtaining according to front four bytes of multicast physical address, obtain the multicast packets sending, as do not found the packet of these features in current frequency range, be switched to next radio band and continue receive all packets and analyze, to obtain the packet of transmission;
(5), reconstruct initial data
Extract latter two byte of multicast physical address in the multicast packets of above-mentioned acquisition as original transmission data, the UDP message length transmitting in multicast packets is carried out to reconfiguring of data as the sequence number of these two bytes in whole transmission data, restore exactly all initial data of transmission; Length-UDP Header-IP Header-MAC Base Header-FCS-MAC Extra Length-Q of sequence number=IEEE 802.11 packets of described data.
The packet that the present invention is compared with prior art transmitted has clear and definite feature, can facilitate recipient to identify in a large amount of wireless data packet, the speed of transmission is high, packet can be forwarded by double-frequency wireless router, thereby be not subject to the restriction of the radio band that transmit leg uses, not affecting the current Wi-Fi network of data receiver connects, equipment sending data outside multiple Wi-Fi networks simultaneously, do not changing on the basis of Wi-Fi standard communications protocol, two Wi-Fi equipment that make to need communication not building network just can carry out the transmission of information, also the equipment in the wireless network of other encryption of can be applicable to is to the equipment sending data outside network.
Accompanying drawing explanation
Fig. 1 is workflow diagram of the present invention.
Embodiment
Embodiment 1
Consult accompanying drawing 1, the present invention is described in further detail as example for 4 byte datas of the present invention take transmission data encoding as 0x01,0x02,0x03 and 0x04, and concrete operations are as follows:
(1), build multicast IP address
Be transmission data: 0x04,0x01,0x02,0x03 and 0x04 by adding a byte that represents data length in the 0x01 of transmission information, 0x02,0x03 and tetra-bytes of 0x04,0x04,0x01,0x02,0x03 and 0x04 are adopted to the D class address for multicast in IPv4, build 1:239.126.4.1,2:239.126.2.3 and tri-multicast IP addresses of 239.126.4.0.The IP address of one type in IPv4, its scope is called as D class address from 224.0.0.0 ~ 239.255.255.255, and D class address is for multicast, and described multicast IP address is: IPByte1.IPByte2.IPByte3.IPByte4.The byte of transmission is left in to latter two byte of D class address, the first two byte is chosen arbitrarily in allowed limits, but must guarantee the unification of a series of multicast address that build, because the byte number of needs transmission is odd number, substitute so the last character saves 0.
(2), build UDP multicast packets
Adopting the length of UDP message data is the sequence number of multicast IP address, take multicast IP address as destination address, is the packet that data packet length builds one group of UDP multicast message by the sequence number of multicast IP address.The data packet length of UDP multicast message corresponding to tri-multicast IP addresses of 1:239.126.4.1, the 2:239.126.2.3 of above-mentioned structure and 239.126.4.0 is respectively 0,1 and 2.
Owing to there being out of order problem in wireless transmission, need to indicate its position in whole data block to the content of each transmission, the initial data so that recipient recombinates, but in real network transmission, the message of IEEE 802.11 has the regulation of a minimum message length, can carry out completion operation to the packet that is less than this minimum length, for IEEE 802.11 networks do not change the data packet length of actual transmissions, the data packet length sending should be greater than the short packages length that IEEE 802.11 agreements allow, need to be by a Q value of the unified increase of the length of data, as Q value is chosen for 20, the data packet length of above-mentioned three corresponding UDP multicast messages in multicast IP address is respectively 20, 21 and 22, the UDP message 1 of its packet: destination address be 239.126.4.1, data length is 20 bytes, UDP message 2: destination address be 239.126.2.3, data length is 21 bytes, UDP message 3: destination address be 239.126.4.0, data length is 22 bytes.
(3), the transmission of packet
Multicast IP address transition is become to the multicast physical address of IEEE 802.11 packets, adopt the ICP/IP protocol stack of computer system that the packet of above-mentioned UDP multicast message is sent with Wi-Fi less radio-frequency by IEEE 802.11 network interfaces; Described physical address is: Byte1-Byte2-Byte3-Byte4-Byte5-Byte6; Described multicast IP presses Byte1=0x01 in address; Byte2=0x00; Byte3=0x5e; Byte4=IPByte2 & 0x7f; Byte5=IPByte3; Byte6=IPByte4 converts the multicast physical address of IEEE 802.11 packets to; Packet length=UDP message packet length+UDP Header (8)+IP Header (20)+MAC Base Header (24)+FCS (4)+MAC Extra Length of described IEEE 802.11 packets;
According to IEEE 802.11 agreements, UDP multicast address is converted to theing contents are as follows of IEEE 802.11 packets that transmit in radio band:
IEEE 802.11 messages 1: multicast physical address is 01-00-5E-7E-04-01; Data packet length is 76+ MAC Extra Length;
IEEE 802.11 messages 2: multicast physical address is 01-00-5E-7E-02-03; Data packet length is 77+ MAC Extra Length;
IEEE 802.11 messages 3: multicast physical address is 01-00-5E-7E-04-00; Data packet length is 78+ MAC Extra Length.
Like this, need the packet of transmission just to appear on the wireless channel of Wi-Fi, although the content of the packet transmitting is encrypted, but the information that the length of the multicast physical address of packet and message has comprised needs transmission, recipient's task obtains these packets and analyzes initial data from wireless channel exactly.
(4), the reception of packet and parsing
Recipient monitors in order each Wi-Fi frequency range and obtains data, receive and resolve all packets in IEEE 802.11 frequency ranges, to obtain the multicast packets in the radio band of transmission and this frequency range, be that fixing feature is filtered IEEE 802.11 multicast packets of obtaining according to front four bytes of multicast physical address, obtain the multicast packets sending, as do not found the packet of these features in current frequency range, be switched to next radio band and continue receive all packets and analyze, to obtain the packet of transmission.
(5), reconstruct initial data
Extract latter two byte of multicast physical address in the multicast packets of above-mentioned acquisition as original transmission data, the UDP message length transmitting in multicast packets is carried out to reconfiguring of data as the sequence number of these two bytes in whole transmission data, accurately restore the initial data of transmission; Length-UDP Header-IP Header-MAC Base Header-FCS-MAC Extra Length-Q of sequence number=IEEE 802.11 packets of described data.
Wherein the length of MAC Extra Length field, along with whether cipher mode and QOS open and change, needs the stem relevant information of analyzing IEEE 802.11 packets to determine, its variation is as follows:
(1), QOS opens: MAC Extra Length increases by 2;
(2), WEP encrypts: MAC Extra Length increases by 8;
(3), CCMP encrypts: MAC Extra Length increases by 16;
(4), TKIP encryption: MAC Extra Length increases by 20.
Because Q=20 is the constant that sender defines in the time sending data, can determine by analyzing these IEEE 802.11 packets: the sequence number of data 0x04,0x01 is 0; The sequence number of data 0x02,0x03 is 1; The sequence number of data 0x04,0x00 is 2.The data that receive are 0x04,0x01,0x02,0x03 and 0x04, because first byte represents the data volume of transmitting, therefore received and met after a length field definition byte number, just represent to have completed the reception of all data, the initial data that restores exactly transmission is: 0x01,0x02,0x03 and 0x04.
The present invention has increased use Wi-Fi message length coded data receive mode on the Wi-Fi of MXCHIP module EMW3161, writes software and the data of 64 bytes are carried out to Wi-Fi message length coding and continued circulation send on iPhone 5 mobile phones.EMW3161 module was no more than for 3 seconds from starting scanning channel to receiving data after tested, had successfully realized the transmission of data, if transmitting channel can be fixed, can greatly accelerate the inbound pacing of data.
The present invention realizes the reception of radio network configuration information on the wireless module EMW316x of MXCHIP, and on iPhone5 mobile phone, writes software by the data of 64 bytes (the network title of 32 bytes and the network cipher of 32 bytes) transmission of encoding and circulate.EMW316x module was no more than for 2 seconds from starting scanning channel to receiving complete data after tested, had successfully realized the transmission of data, if transmitting channel can be fixed, the inbound pacing of data also can be accelerated greatly.
More than just the present invention is further illustrated, and not in order to limit this patent, all is the present invention's equivalence enforcement, within all should being contained in the claim scope of this patent.
Claims (1)
1. one kind is carried out the information transferring method of Wi-Fi message length based on multicast physical address, it is characterized in that the multicast physical address in IEEE 802.11 packets to represent the information of transmission, represent the position of data with data segment, length in UDP message, adopting UDP is the agreement that data send, utilize Wi-Fi network to send Wi-Fi message to more than one Wi-Fi net external equipment and carry out the transmission of information, the packet receiving and resolve is reconfigured to rear reconstruct initial data, and its concrete operation step is as follows:
(1), build multicast IP address
In the byte of initial data, add and represent after the byte of data length as transmission data, adopt in IPv4 D class address for multicast to the unified multicast IP address sequence of transmission data construct; Described D class address realm is: 224.0.0.0 ~ 239.255.255.255; Described multicast IP address is: IPByte1.IPByte2.IPByte3.IPByte4;
(2), build UDP multicast packets
Take multicast IP address as destination address, be the packet that data packet length builds one group of UDP multicast message by the sequence number of multicast IP address;
(3), the transmission of packet
Multicast IP address transition is become to the multicast physical address of IEEE 802.11 packets, adopt the ICP/IP protocol stack of computer system that the packet of above-mentioned UDP multicast message is sent with Wi-Fi less radio-frequency by IEEE 802.11 network interfaces; Described physical address is: Byte1-Byte2-Byte3-Byte4-Byte5-Byte6; Described multicast IP presses Byte1=0x01 in address; Byte2=0x00; Byte3=0x5e; Byte4=IPByte2 & 0x7f; Byte5=IPByte3; Byte6=IPByte4 converts the multicast physical address of IEEE 802.11 packets to; Packet length=UDP message packet length+UDP Header (8)+IP Header (20)+MAC Base Header (24)+FCS (4)+MAC Extra Length of described IEEE 802.11 packets;
(4), the reception of packet and parsing
Recipient monitors in order each Wi-Fi frequency range and obtains data, receive and resolve all packets in IEEE 802.11 frequency ranges, obtain the multicast packets in the radio band of transmission and this frequency range, be that fixing feature is filtered IEEE 802.11 multicast packets of obtaining according to front four bytes of multicast physical address, obtain the multicast packets sending, as do not found the packet of these features in current frequency range, be switched to next radio band and continue receive all packets and analyze, to obtain the packet of transmission;
(5), reconstruct initial data
Extract latter two byte of multicast physical address in the multicast packets of above-mentioned acquisition as original transmission data, the UDP message length transmitting in multicast packets is carried out to reconfiguring of data as the sequence number of these two bytes in whole transmission data, restore exactly all initial data of transmission; Length-UDP Header-IP Header-MAC Base Header-FCS-MAC Extra Length-Q of sequence number=IEEE 802.11 packets of described data.
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| CN105228151A (en) * | 2015-10-16 | 2016-01-06 | 天彩电子（深圳）有限公司 | A kind of method and apparatus of quick transmission air message |
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| US10686656B2 (en) | 2015-09-15 | 2020-06-16 | Signify Holding B.V. | Provisioning a wireless device without keypad |
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