CN102387475A - Transmitting method for guaranteeing reliability of wireless multicast - Google Patents
Transmitting method for guaranteeing reliability of wireless multicast Download PDFInfo
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- CN102387475A CN102387475A CN2011104090639A CN201110409063A CN102387475A CN 102387475 A CN102387475 A CN 102387475A CN 2011104090639 A CN2011104090639 A CN 2011104090639A CN 201110409063 A CN201110409063 A CN 201110409063A CN 102387475 A CN102387475 A CN 102387475A
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Abstract
The invention provides a transmitting method for guaranteeing the reliability of wireless multicast. In the method, a router is required to receive a multicast packet from a kernel protocol stack module according to group members recorded in an Internet group management protocol (IGMP) multicast forwarding table, searches table items matched with the multicast group from the multicast forwarding table according to a multicast group multiple access control (MAC) address carried in the multicast packet, converts the multicast packet into unicast packets according to the matched table items and sends the unicast packets to the corresponding group members. A data packet is sent by adopting a mode of converting multicast to unicast; even if the data packet is lost, the data packet can be resent; therefore, loss of multicast packets is reduced and controlled, the network throughput is increased and an effect of a multicast video is improved.
Description
Technical field
The invention belongs to data communication technology field, relate to a kind of transmission method of wireless multicast reliability.
Background technology
Nternet igmpinternet (IGMP Internet Group Management Protocol) is a multicast protocol in the Internet Protocol family, is used for router report their the group membership situation of IP main frame to any direct neighbor.IGMP information is encapsulated in the IP message, and the protocol number of its IP is 2.
It is used for the ip main frame and and the multicast router of its direct neighbor between set up, safeguard the multicast member relation.Igmp does not comprise the propagation and the maintenance of the group membership's relation information between the multicast router, and this part work is accomplished by each multicast routing protocol.All participate in the main frame of multicast must realize igmp.
The main frame of participating in the ip multicast can be at an arbitrary position, random time, member's sum adds without restriction or withdraw from multicast group.Multicast router does not need can not preserve the member relation of All hosts yet, and it is the recipient who whether has certain multicast group on the network segment through each interface connection of igmp agreement understanding, i.e. group membership.And main frame side only need preserve and oneself added which multicast group.
Igmp is asymmetric between main frame and router: main frame need respond the igmp query message of multicast router, promptly with igmp membership report message response; Router periodically sends the membership qualification query message; Confirm according to the response message of receiving certain particular group oneself is belonging to whether the main frame adding is arranged on the subnet then; And when receive main frame withdraw from the report of group the time; Send the query message (igmp version 2) of particular group, whether do not had the member and existed as shown in Figure 1 to confirm certain particular group.
Multicast is the form that a kind of multiple spot is delivered, and it uses hardware technology, communicates by letter through using a large amount of multicast address.When a certain group of machinery requirement communication, select a multicast address, and configure corresponding network interface hardware; The identification multicast address; Thereby receive the copy that divides into groups on this multicast address, it has improved data-transmission efficiency, has reduced backbone network and congested possibility occurred.But multicast transmission is used a kind of Best Effort (best effort) technology usually; It does not reply (ACK) mechanism, and when packet loss, transmitting terminal can not carry out data re-transmission; This has just caused the generation of possibility multicast packet loss; Yet growing along with the wireless multimedia communication demand, this insecure transmission certainly will become a bottleneck of wireless multicast.
Summary of the invention
The objective of the invention is when solving the multicast transmission packet loss; Transmitting terminal can not carry out data re-transmission; This has just caused the generation of possibility multicast packet loss; Yet growing along with the wireless multimedia communication demand, this insecure transmission certainly will become the deficiency of a bottleneck of wireless multicast.A kind of transmission method of guaranteeing the wireless multicast reliability is provided.
Technical scheme of the present invention is: a kind of transmission method of guaranteeing the wireless multicast reliability; Router is according to being recorded in the group membership in the IGMP multicast forward table in this method; Need receive multicast packets in the kernel protocol stack module; Search the list item that is complementary with this multicast packets in the described multicast forward table according to the multicast group mac address that carries in this multicast packets, and according to this coupling list item said multicast packets is converted into and to be sent to corresponding group membership after the unicast packet.
Further, in the above-mentioned transmission method of guaranteeing the wireless multicast reliability: may further comprise the steps:
A, server send multicast packets to internet group management protocol snooping;
B, router are searched corresponding member according to multicast forward table, if just find turning to step C in the multicast packets address, otherwise turn to step D;
C, convert unicast packet into, be sent to corresponding wave point, corresponding to the wireless driver module of wave point said unicast packet is sent to destination host;
D, continue to send multicast packets to corresponding wave point, corresponding to the wireless driver module of wave point multicast packets is sent to destination host.
Further, in the above-mentioned transmission method of guaranteeing the wireless multicast reliability: described multicast forward table is safeguarded by internet group management protocol snooping.
Further; In the above-mentioned transmission method of guaranteeing the wireless multicast reliability: among the described step B, when multicast packets converted unicast packet into, the ip layer of bag remained unchanged; Through changing the purpose mac domain of bag, send bag with the form of clean culture to each member of multicast at the MAC layer.
The mode that employing multicast of the present invention transfers clean culture to is sent packet, even lose when packet, also can retransmit, and this just reduces and has controlled losing of multicast packets, has improved network throughput, has improved the effect of group broadcasting video frequency.
Below in conjunction with specific embodiment the present invention is done comparatively detailed description.
Description of drawings
Fig. 1 upgrades the flow process of multicast forward table for internet group management protocol snooping.
Fig. 2 is a flow chart of the present invention.
Embodiment
The schematic diagram of embodiment 1 is as shown in Figure 2:
Utilize the continuous displaying video of VLC Media Player to send multicast packets on A, the multicast server to internet group management protocol snooping; Here, internet group management protocol snooping (abbreviation of IGMP Snooping Internet Group Management Protocol Snooping), it is the multicast tied mechanism that operates on the two-layer equipment, is used for management and control multicast group;
B, router are searched corresponding member according to the multicast forward table among the IGMP Snooping, if just find turning to step C in the multicast packets address, otherwise turn to step D;
C, convert unicast packet into, be sent to corresponding wave point, corresponding to the wireless driver module of wave point said unicast packet is sent to destination host;
D, continue to send multicast packets to corresponding wave point, corresponding to the wireless driver module of wave point multicast packets is sent to destination host.
Concrete do a compare test: on multicast server, utilize the continuous displaying video of VLC Media Player; It is 239.1.1.5 that multicast server address is set; Port numbers is 1234, and radio node also adds multicast 239.1.1.5 with VLC Media Player, carries out receiver, video stream.Use the method for traditional group broadcast mode and present embodiment respectively, observe the video flowing situation of change.Make discovery from observation, the video reception effect is bad in the traditional group broadcast mode, and fuzzy pictures is unclear, and mosaic phenomenon is serious.Use the mode of this method, it is clear that picture obviously becomes, and plays also relatively more smooth.
The traditional group broadcast mode does not have ACK mechanism, and multicast packets is lost seriously between AP and radio node, behind data-bag lost, can not retransmit, and this has just caused packet loss than higher, and the group broadcasting video frequency reception is undesirable.And the embodiment of the invention is just caught this shortcoming of traditional multicast, and the mode that adopts multicast to transfer clean culture to is sent packet, loses even work as packet; Also can retransmit; This just reduces and has controlled losing of multicast packets, has improved network throughput, has improved the effect of group broadcasting video frequency.
The present invention is advantage compared with prior art:
1. utilize the ACK feedback and the overtime retransmission mechanism of clean culture, will help to realize packet loss extremely low in the flux of multicast, improved the reliability of wireless multicast greatly;
2. the present invention has reduced the link that wireless driver module is handled multicast packets, under identical professional qualification, can save cpu resource;
3. improve the real-time that multicast changes unicast service, solved wireless multicast commentaries on classics unicast service to a certain extent and relied on high performance hardware resource problem, thereby also reduced the hardware cost of product.
Claims (4)
1. transmission method of guaranteeing the wireless multicast reliability; It is characterized in that: router is according to being recorded in the group membership in the IGMP multicast forward table in this method; Need receive multicast packets in the kernel protocol stack module; Search the list item that is complementary with this multicast packets in the described multicast forward table according to the multicast group mac address that carries in this multicast packets, and according to this coupling list item said multicast packets is converted into and to be sent to corresponding group membership after the unicast packet.
2. the transmission method of guaranteeing the wireless multicast reliability according to claim 1 is characterized in that: may further comprise the steps:
A, server send multicast packets to internet group management protocol snooping;
B, router are searched corresponding member according to multicast forward table, if just find turning to step C in the multicast packets address, otherwise turn to step D;
C, convert unicast packet into, be sent to corresponding wave point, corresponding to the wireless driver module of wave point said unicast packet is sent to destination host;
D, continue to send multicast packets to corresponding wave point, corresponding to the wireless driver module of wave point multicast packets is sent to destination host.
3. the transmission method of guaranteeing the wireless multicast reliability according to claim 2 is characterized in that: described multicast forward table is safeguarded by internet group management protocol snooping.
4. the transmission method of guaranteeing the wireless multicast reliability according to claim 2; It is characterized in that: among the described step C, when multicast packets converted unicast packet into, the ip layer of bag remained unchanged; Through changing the purpose mac domain of bag, send bag with the form of clean culture to each member of multicast at the MAC layer.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102882795A (en) * | 2012-09-29 | 2013-01-16 | 福建星网锐捷网络有限公司 | Method and device for issuing internet protocol (IP) multicast message in wireless network |
| CN104333481A (en) * | 2014-09-23 | 2015-02-04 | 无锡锐格思信息技术有限公司 | Method for forming correct forwarding table through PC multicast ping packet |
| CN104935443A (en) * | 2014-03-17 | 2015-09-23 | 中兴通讯股份有限公司 | Multicast data processing method, device and system, transmitting equipment, and receiving client |
| CN111371488A (en) * | 2020-03-13 | 2020-07-03 | 北京邮电大学 | Content data transmission method and device and electronic equipment |
| CN114157529A (en) * | 2021-12-01 | 2022-03-08 | 东方财富信息股份有限公司 | Distributed data transmission system and method |
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| CN101534231A (en) * | 2009-04-17 | 2009-09-16 | 杭州华三通信技术有限公司 | Method, system and equipment for transmitting data in elastic grouping ring |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102882795A (en) * | 2012-09-29 | 2013-01-16 | 福建星网锐捷网络有限公司 | Method and device for issuing internet protocol (IP) multicast message in wireless network |
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| CN104935443A (en) * | 2014-03-17 | 2015-09-23 | 中兴通讯股份有限公司 | Multicast data processing method, device and system, transmitting equipment, and receiving client |
| CN104333481A (en) * | 2014-09-23 | 2015-02-04 | 无锡锐格思信息技术有限公司 | Method for forming correct forwarding table through PC multicast ping packet |
| CN111371488A (en) * | 2020-03-13 | 2020-07-03 | 北京邮电大学 | Content data transmission method and device and electronic equipment |
| CN114157529A (en) * | 2021-12-01 | 2022-03-08 | 东方财富信息股份有限公司 | Distributed data transmission system and method |
| CN114157529B (en) * | 2021-12-01 | 2024-01-23 | 东方财富信息股份有限公司 | Distributed data transmission system and method |
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Application publication date: 20120321 |