CN101877824A - Method, mobile equipment and network access equipment for terminating redundant multicast data transmission - Google Patents
Method, mobile equipment and network access equipment for terminating redundant multicast data transmission Download PDFInfo
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Abstract
The embodiment of the invention discloses a method and a mobile terminal for terminating redundant multicast data transmission. The method comprises the following steps of: when a mobile multicast receiver moves from a first network to a second network and receives multicast data from the second network and the first network, sending a terminating control message to network access equipment which is responsible for forwarding the multicast data from the first network, and notifying the network access equipment to terminate to forward the multicast data which is from the first network to the mobile multicast receiver. As the original multicast forwarding is broken off when new multicast data arrives, the forwarding of invalid multicast data is avoided, and thus network wide band resource is saved.
Description
Technical field
The present invention relates to communication technical field, particularly relate in the moving communicating field about ending method, mobile device and the network access equipment of redundant multicast data transmission.
Background technology
The mobile multicast technology is a kind of technology that mobile IP (MIP) technology and multicast (multicast) technology are combined.Mobile multicast can use mobile IP technology (MIPv6, MIPv4, PMIP etc.) to finish (the Mobile Multicast Receiver to the mobile multicast recipient, abbreviate MMR as) at local network access equipment (Home network Access Router, abbreviate HAR as) on registration and binding, use igmpinternet (to use Internet Group Management protocol-Internet Group Management Protocol at the IPv4 network, abbreviate IGMP as; Or at IPv6 network use Multicast Listener Discovery-multicast monitoring discovery, abbreviate MLD as) add and leave a multicast group, use multicast routing protocol (PIM-SM, PIM-SSM, MPLS p2mp LDP, MPLS p2mp RSVP-TE etc.) is building up to the multicast tree of multicast source, and multicast packet is delivered to MMR from multicast source.
When MMR is positioned at home network,, then send IGMP or MLD group membership report to HAR if wish receiving multicast business.HAR can adopt any type of multicast routing protocol, and upstream the network equipment sends the multicast protocol message and makes up multicast tree.HAR is not if support multicast routing protocol can adopt IGMP-Proxy mechanism yet, and the group membership of upstream device relaying MMR reports the multicast tree that makes up multicast source.HAR also needs to send IGMP or MLD group membership inquiry according to the requirement of igmpinternet to MMR, need transmit to MMR after receiving from the multicast packet of multicast source.
When MMR is positioned at field network, need be configured in address (the Foreign Address that field network uses, abbreviate FA as), then by MMR or its field network access device (Foreign Access Router, abbreviate FAR as) use mobile IP signaling to initiate register requirement to HAR, HAR sets up binding relationship according to register requirement, sends the accreditation verification message to MMR or FAR.After this can select to adopt tunneling mechanism or optimization multicast routing mechanism to finish the adding of group, the structure of multicast tree and the forwarding of multicast packet.
In tunneling mechanism, the group membership of MMR reports by the tunnel between MMR and the HAR, or transmits to HAR by the tunnel between FAR and the HAR.After HAR receives this report, carry out the structure of multicast tree on home network, the situation when the achievement method is positioned at home network with MMR is identical.HAR sends the group polling message by the tunnel to FAR or to MMR, and behind the multicast packet that receives from multicast source, transmits to FAR or to MMR by the tunnel.When above-mentioned group polling message and multicast packet were sent to FAR by the tunnel, FAR decapsulation message was also transmitted to MMR, when above-mentioned message is sent to MMR by the tunnel, by MMR decapsulation message.
In optimizing the multicast routing mechanism, send group membership's report of MMR to FAR, after FAR receives this report, on field network, carry out the structure of multicast tree, situation when the achievement method is positioned at home network with MMR is identical, and promptly FAR can adopt any type of multicast routing protocol network equipment transmission upstream multicast protocol message to make up multicast tree.FAR is not if support multicast routing protocol can adopt IGMP-Proxy mechanism yet, and the group membership of upstream device relaying MMR reports the structure multicast tree.FAR sends the group polling message to MMR, and transmits this multicast packet to MMR after receiving the multicast packet of multicast source.
When MMR switches, promptly from former access network when new access network moves, if in the middle of switching, still need receiving multicast business, then require MMR to dispose the address that new network uses, again initiate registration to HAR, in new network, send group membership's report and receiving multicast data.But after multicast packet arrives new network, might the recipient also keep connection with former network, be two parts of multicast packets that the recipient may receive make a fresh start link and former link,, therefore cause the invalid traffic consumption of network resources owing to do not need to receive the data of former network this moment.
In order to solve existing the problems referred to above, make after receiving the data of new network, end the forwarding of former network data, to avoid the invalid traffic consumption of network resources, a solution of the prior art is the method that adopts timer expiry to end, and promptly HAR can rule of thumb set a timer, adopts the timer timing after sending multicast packet to new link, when this timer expiry, promptly end to send multicast packet to former link.
But the inventor finds in research process, if adopt technique scheme, so:
1) when MR switches, network is complicated and changeable usually, and inappropriate situation can appear in the timer numerical value that above-mentioned rule of thumb data are determined; With
2) in the responsible inconsistent scene of network access equipment former, new transmitting multicast data, as the scene of switching for routing optimality, pFAR is responsible for former multicast forwarding and the responsible new multicast forwarding of nPAR, pFAR does not also know when nFAR begins successfully multicast data forwarding, thereby is difficult to determine the transmission of a suitable fixed time interval termination multicast packet.
Summary of the invention
In order to solve the above-mentioned problems in the prior art, it is higher to the invention provides a kind of feasibility, the better technical scheme of flexibility, more effectively to solve when switching is finished, MMR may receive the data of make a fresh start network and former network simultaneously and cause invalid traffic therefore to cause the problem of consumption of network resources.
For this reason, the embodiment of the invention provides a kind of method of ending the redundant multicast data transmission, comprise that working as the mobile multicast recipient moves to second network from first network, and when described mobile multicast recipient receives from the multicast packet of described second network and described first network simultaneously, then send termination control message, notify described network access equipment to end to the multicast packet of described mobile multicast recipient forwarding from described first network to being responsible for the network access equipment of forwarding from the multicast packet of described first network.
The embodiment of the invention also provides a kind of mobile device of implementing said method of the present invention, described mobile device moves to second network from first network, described mobile device comprises receiving system, is used to receive the multicast packet from described first network and described second network; And dispensing device, be used for when described receiving system receives multicast packet from described first network and described second network, send termination control message to being responsible for the network access equipment of forwarding, notify described network access equipment to end to the multicast packet of described mobile multicast recipient forwarding from described first network from the multicast packet of described first network.
The embodiment of the invention also provides a kind of method of ending the redundant multicast data transmission, comprise when the mobile multicast recipient when first network moves to second network and receive multicast packet from described second network and described first network simultaneously, then send described termination control message, the described first network of network access device receives the termination control message from the mobile multicast recipient, and ends to the multicast packet of described mobile multicast recipient forwarding from described first network.
The embodiment of the invention also provides a kind of network access equipment of implementing said method of the present invention, comprise receiving system, be used to receive the termination control message that when first network moves to second network and receive multicast packet from described second network and described first network, is sent as the mobile multicast recipient; And abortion means, be used for after described receiving system receives described termination control message, ending to the multicast packet of described mobile multicast recipient forwarding from described first network.
Based on technique scheme, method, mobile device and the network access equipment of the termination redundant multicast data transmission that the embodiment of the invention provides, when the mobile multicast recipient when first network moves to second network and receive multicast packet from described second network and described first network, send and end the control message, notify described network access equipment to end to the multicast packet of described mobile multicast recipient forwarding from described first network.The technical scheme that the embodiment of the invention provides has overcome in the prior art such as using existing defective such as timer, has avoided the forwarding of invalid multicast packet more effectively, reliably, thereby has saved network bandwidth resources.
Description of drawings
Figure 1A shows in the tunnel handoff scenario of field network of the embodiment of the invention one, and when former tunnel rises when terminating in HAR and pFAR, the utilization group is left the control message and ended the schematic diagram of former transmitting multicast data.
Figure 1B shows in the tunnel handoff scenario of field network of the embodiment of the invention one, and when former tunnel rises when terminating in HAR and MMR, the utilization group is left the control message and ended the schematic diagram of former transmitting multicast data.
Fig. 2 shows the optimization multicast path of field network of the embodiment of the invention one by in the handoff scenario, and the utilization group is left the control message and ended the schematic diagram of former transmitting multicast data.
Fig. 3 A shows in the mixing handover mechanism scene of field network of the embodiment of the invention one, and when former tunnel rises when terminating in HAR and pFAR, the utilization group is left the control message and ended the schematic diagram of former transmitting multicast data.
Fig. 3 B shows in the mixing handover mechanism scene of field network of the embodiment of the invention one, and when former tunnel rises when terminating in HAR and MMR, the utilization group is left the control message and ended the schematic diagram of former transmitting multicast data.
Fig. 4 A shows in the mixing handover mechanism scene of another field network of the embodiment of the invention one, and when new tunnel rises when terminating in HAR and nFAR, the utilization group is left the control message and ended the schematic diagram of former transmitting multicast data.
Fig. 4 B shows in the mixing handover mechanism scene of another field network of the embodiment of the invention one, and when new tunnel rises when terminating in HAR and MMR, the utilization group is left the control message and ended the schematic diagram of former transmitting multicast data.
Fig. 5 show the embodiment of the invention one from home network outwards the network handoff scenario, the utilization group is left the control message and is ended the schematic diagram of former transmitting multicast data.
Fig. 6 A show the embodiment of the invention one from field network to the home network handoff scenario, when former tunnel rises when terminating in HAR and pFAR, the utilization group is left the control message and is ended the schematic diagram of former transmitting multicast data.
Fig. 6 B show the embodiment of the invention one from field network to the home network handoff scenario, when former tunnel rises when terminating in HAR and MMR, the utilization group is left the control message and is ended the schematic diagram of former transmitting multicast data.
Fig. 7 shows another field network of the embodiment of the invention one in the home network handoff scenario, and the utilization group is left the control message and ended the schematic diagram of former transmitting multicast data.
Fig. 8 shows in the use fast switching scene of the embodiment of the invention one, and the utilization group is left the control message and ended the schematic diagram of former transmitting multicast data.
Fig. 9 shows in another use fast switching scene of the embodiment of the invention one, and the utilization group is left the control message and ended the schematic diagram of former transmitting multicast data.
Figure 10 shows the schematic diagram of the portable terminal of enforcement the foregoing description one described method of the present invention.
Figure 11 shows the schematic diagram of the portable terminal of enforcement the foregoing description two described methods of the present invention.
Figure 12 shows the schematic diagram of the network access equipment of the described termination redundant multicast data of enforcement of the present invention transmission method.
Embodiment
Understand and realization the present invention for the ease of those of ordinary skills, now set forth the present invention with specific embodiment in conjunction with the accompanying drawings.
First embodiment
The first embodiment of the present invention has provided a kind of method of ending the redundant multicast data transmission, when in the mobile multicast receiving course, switching, when if the mobile multicast recipient receives the multicast packet of new network and the transmission of former network simultaneously, for fear of transmitting invalid multicast packet, be that the group of the address of MMR in former network is left the control message then to former network access equipment transmission source address to save network bandwidth resources.When former network access equipment receives source address is that the group of the address of MMR in former network is left the control message, judges that then it is the control message of ending former link that the group that is received is left the control message, ends the forwarding of former multicast packet.
Fig. 1-the 9th, it is schematic diagram how to end the various scenes of redundant multicast data that the group that first embodiment of the invention is described is left the control message.
Figure 1A and Figure 1B show the scene of switching in the tunnel of field network.When wherein Figure 1A terminated in home network access device HAR and former field network access device pFAR for rising when former tunnel, when Figure 1B terminated in HAR and MMR for rising when former tunnel, the utilization group was left the control message and is ended the schematic diagram of former transmitting multicast data.In this scene, MMR uses tunneling mechanism from HAR receiving group flow before and after switching.When switch taking place, obtaining new field network address (nFA) and after the HAR registration, HAR will send multicast packet to MMR from new tunnel.If MMR receives multicast packet simultaneously on former tunnel and new tunnel (being former link and new link), be that the group of the address (pFA) of MMR in former field network is left the control message promptly to the HAR transmission source address, this message is through the tunnel, for instance, can also can arrive HAR through new tunnel through former tunnel.HAR finds that on inspection oneself sends multicast packet through new, former tunnel to MMR just at the same time, judges that then this is a control message of ending former link, can end to send multicast packet from former tunnel to MMR.This moment is owing to need send data to MMR on new tunnel, so HAR still is required to be MMR craft personal relation.
Fig. 2 shows at the optimization multicast path of field network by the scene of switching.In this scene, MMR uses multicast routing optimization mechanism from FAR receiving group flow before and after switching.When switching generation, MMR is obtaining nFA, register to HAR, and use new field network couple in router (nFAR) after setting up multicast tree on the field network, nFAR sends new multicast packet to MMR, if MMR simultaneously receives multicast packet on former link and new link, be that the group of pFA is left the control message to the pFAR transmission source address promptly, after pFAR receives this message, end from former link, to send multicast packet to MMR.
Wherein, if MMR uses home address (Home Adress in former field network, abbreviate HA as) multicast group of adding, because it is pFA that group is left the source address of control message, then pFAR can judge that it is a termination message that this group is left the control message, can stop to send multicast packet, the associative operation that pFAR also can select further implementation group to leave to MMR.If MMR uses pFA to add a multicast group in former field network, then pFAR can not judge that this is that termination message or common group are left the control message, but owing to the processing of pFAR in two kinds of scenes is identical, therefore can not produce compatibility issue.
Fig. 3 A and 3B show MMR uses the multicast routing mechanism optimized on new network using tunneling mechanism on the former network the scene at the mixing handover mechanism of field network.When wherein Fig. 3 A terminated in HAR and pFAR for rising when former tunnel, when Fig. 3 B terminated in HAR and MMR for rising when former tunnel, the utilization group was left the control message and is ended the schematic diagram of former transmitting multicast data.If MMR receives multicast packet simultaneously on new, former two links, be that the group of pFA is left the control message promptly to the HAR transmission source address, this message arrives HAR through the tunnel, HAR sends out earlier on inspection, and oneself sends data and has finished the registration of MMR on new network to pFA, judge that then this is a control message of ending transmitting multicast data, can terminate on the former network and send multicast packet to MMR.
Fig. 4 A and Fig. 4 B show MMR the multicast path of use optimizing on the former network by and on new network, use the scene at the mixing handover mechanism of field network of tunneling mechanism.When wherein Fig. 4 A terminated in HAR and nFAR for rising when new tunnel, when Fig. 4 B terminated in HAR and MMR for rising when new tunnel, the utilization group was left the control message and is ended the schematic diagram of former transmitting multicast data.If MMR is receiving multicast data on new, former two links simultaneously, be that the group of pFA is left the control message promptly to the pFAR transmission source address, after pFAR receives this message, end to send to the multicast of MMR.Its decision process is identical by the decision process of handoff scenario with the optimization multicast path of the described field network of Fig. 2.
Fig. 5 shows from the scene of home network network switching outwards.In this scene, after MMR receives multicast packet simultaneously from new, former link, be that the group of the address of MMR in home network is left the control message promptly to the HAR transmission source address, HAR can determine that this is one and ends message HAR according to the binding relationship of nFA and HA, and ends after receiving this message to the multicast packet of MMR forwarding from home network.
Fig. 6 A and Fig. 6 B show from field network and switch to home network, and use the scene of tunneling mechanism when field network.When wherein Fig. 6 A terminated in HAR and pFAR for rising when former tunnel, when Fig. 6 B terminated in HAR and MMR for rising when former tunnel, the utilization group was left the control message and is ended the schematic diagram of former transmitting multicast data.In this scene, after MMR receives multicast packet simultaneously from new, former link, be that the group of pFA is left the control message by the tunnel transmission source address promptly to HAR, HAR receives after this group is left the control message and ends to send multicast packet by the tunnel to MMR.Because HAR also needs to send not multicast packet by the tunnel to MMR in home network, so HAR also is required to be MMR craft personal relation.
Fig. 7 shows from field network and switches to home network, and the multicast path of use optimizing when field network by scene.After if MMR receives multicast packet simultaneously from new, former link, be that the group of pFA is left the control message promptly to the pFAR transmission source address, pFAR receives and ends to send multicast packet to MMR after this group is left the control message.Its judgement is identical by handoff scenario with the optimization multicast path of the described field network of Fig. 2 with processing procedure.
In addition, in the scene of general handover mechanism, because being connected to MMR from MMR and new network receives and needs between the multicast packet to spend the regular hour, can take quick handover mechanism for reducing message dropping, set up over run tunnel between former access device and the new access device by signaling when promptly switch taking place, the multicast packet of former network is sent to new access device through over run tunnel from former access device, send to MMR after new these data of access device decapsulation.
Fig. 8 shows and uses the scene of switching fast, if MMR receives simultaneously from the multicast packet that over run tunnel transmits between pFAR and the nFAR that passes through that arrives on the multicast packet of former link and the new link, then MMR is pFA by former chain road direction pFAR transmission source address promptly group is left the control message, after pFAR receives this message, termination sends multicast packet to MMR from former link, but still be MMR craft personal relation, and will send to nFAR by over run tunnel by multicast packet.
Fig. 9 shows and uses the another kind of scene of switching fast, receive the multicast packet that the over run tunnel between pFAR and the nFAR transmits that passes through that arrives on the multicast packet of the network of making a fresh start and the new link simultaneously as MMR, be that the group of pFA is left the control message promptly to the nPAR transmission source address, nFAR passes to pFAR by over run tunnel with this message, after pFAR receives this message, terminate in the standby transmission of multicast packet between pFAR and the nFAR over run tunnel, and the associative operation that can select further implementation group to leave.
More than in the various scenes, after MMR received redundant multicast packet, transmission source address was that the group of the address of MMR in former network is left the control message.The transmission that this group is left the control message mainly is in order to end unnecessary multicast packet with the fastest speed, rather than only is used for leaving a multicast group.In addition, responsible forwarding in above-mentioned each scene is from the network access equipment of the multicast packet of former network, for example HAR or pFAR are before ending multicast data forwarding, need judge whether to exist other recipients that share the conversion link of corresponding former network with described mobile multicast recipient, if there is no described other recipients, then carry out described termination to the operation of described mobile multicast recipient forwarding from the multicast packet of described former network, if there are described other recipients, then do not carry out this operation.
Group is left the control message according to the IGMP/MLD protocol version that uses between MMR and HAR or the FAR, can be IGMPv2, IGMPv3, MLDv1, MLDv2.It is that MMR is group or the source-group information that this flux of multicast of reception will add that group is left the group that comprises of control message.
Figure 10 shows the portable terminal 1000 of enforcement the foregoing description one described termination redundant multicast data transmission method of the present invention, this portable terminal comprises receiving system 1001, is used for receiving when the mobile multicast receiving course switches the multicast packet of the new network address and former field network address or home network address; With dispensing device 1002, be used for when described receiving system receives the multicast packet of the new network address and the former network address simultaneously, be that the group of the address of MMR in former network is left the control message then to former network access equipment transmission source address, it is that the group of the address of MMR in former network is left the control message that former network access equipment receives source address, judge that then it is the control message of ending former link that the group that is received is left the control message, thereby end the forwarding of former multicast packet.
Second embodiment
The difference of the second embodiment of the present invention and first embodiment is that the IGMP or the MLD of definition newtype ends the control message, and being used to identify this message is the control message of ending former link group multicast data.For instance, this control message adopts IGMP or MLD group to leave the form of control message, and the main distinction is the type field of message is made as " termination " type.Because type of message can be distinguished for Delivery Function, setting to the source address of message does not have special requirement, as being made as the original network address, can discern this message and be sent if perhaps guarantee Delivery Function by MMR, then the source address of message can be made as the new network address.HAR or pFAR end to send multicast packet to MMR after receiving this termination control message.The IGMP of employing definition newtype or MLD termination control message are ended redundant multicast data in each scene process is similar to first embodiment, therefore is not described in detail.
In addition, as former Delivery Function (HAR, pFAR) before ending multicast data forwarding, need judge whether to exist other recipients that share the conversion link of corresponding former network with described mobile multicast recipient, if there is no described other recipients, then carry out described termination to the operation of described mobile multicast recipient forwarding,, then do not carry out this operation if there are described other recipients from the multicast packet of described former network.
End the control message according to the IGMP/MLD protocol version that uses between MMR and HAR or the FAR, can be IGMPv2, IGMPv3, MLDv1, MLDv2.The group information that message comprises is that MMR is group or the source-group information that this flux of multicast of reception will add.
Illustrate the termination control message that second embodiment of the invention defines below in the message format of different igmpinternets.
It is the IGMPv2 message format of (its IP head is ignored) that table 1 shows igmpinternet.
Table 1
Type: type of message, when value is group membership's query message during for 0x11; 0x16 is group membership's report; 0x17 leaves the control message for group.
Maximum response time: the maximum response time that before sending report, allows.
Verification and: the verification of whole message and.
Group address: the numerical value different according to the different set of type of message.
Wherein, can will end the control message in " type " field of above-mentioned message and be defined as new numerical value, and leave the control message with already used group membership's inquiry, group membership's report and group and distinguish mutually.
It is the IGMPv3 message format of (its IP head is ignored) that table 2 shows igmpinternet.
IGMPv3 group membership report is different with group membership's interrogate format, and group membership's report both can be used for representing that the group membership added and group is left the control message, ends the form that the control message selects for use the group membership to report.
Table 2
Type: value is 0x22, indicates that this is group membership's report, distinguishes with query message.
Reserve: be made as 0 during transmission, ignore during reception.
Verification and: the verification of entire I GMP message and.
Group record number: what group records are arranged in the group.
Group record: send the relevant information that group membership's report comprises.
Wherein, can will end the control message in " type " field of above-mentioned message and be defined as new numerical value, distinguish mutually with using group membership's report message.In addition, also can not set new type of message, be used for identifying this message specially for ending the numerical value of control message but one of them fields of two reserved fields of above-mentioned message is set at one.
It is the MLDv1 message format of (its ICMPv6 head is ignored) that table 3 shows igmpinternet.
Table 3
Type: type of message, value are to be group membership's inquiry at 130 o'clock; Value is to be group membership's report at 131 o'clock; Value is to leave the control message for group at 132 o'clock.
Code: be made as 0 during transmission, ignore during reception.
Verification and: the ICMPv6 verification of standard and, cover " a pseudo-field " in whole M LD message and the IPv6 head during calculating.
The peak response time delay: but allow to send the maximum permissible delay of reporting.
Group address: the difference according to type of message is made as different numerical value.
Wherein, can will end the control message in " type " field of above-mentioned message and be defined as new numerical value, and leave the control message with already used group membership's inquiry, group membership's report and group and distinguish mutually.Also can not set new type, be used for identifying this message specially for ending the numerical value of control message but the code of message or one of them field in the reserved field are set at one.
It is the MLDv2 message format of (its ICMPv6 head is ignored) that table 4 shows igmpinternet.
MLDv2 group membership report is different with group membership's interrogate format, and group membership's report both can be used for representing that the group membership added and group is left the control message, ends the form that the control message selects for use the group membership to report.
Table 4
Type: value is 143, indicates that this is group membership's report, distinguishes with query message.
Reserve: be made as 0 during transmission, ignore during reception.
Verification and: the ICMPv6 verification of standard and, cover " a pseudo-field " in whole M LD message and the IPv6 head during calculating.
Group record number: what group records are arranged in the group.
Group record: send the relevant information that group membership's report comprises.
Wherein, can will end the control message in " type " field of above-mentioned message and be defined as new numerical value, distinguish mutually with using group membership's report message.In addition, also can not set new type of message, be used for identifying this message specially for ending the numerical value of control message but in one of them field of two reserved fields of above-mentioned message, set one.
Figure 11 shows the portable terminal 1100 of enforcement the foregoing description two described termination redundant multicast data transmission methods of the present invention, this portable terminal comprises receiving system 1101, is used for receiving when the mobile multicast receiving course switches the multicast packet of the new network address and former field network address or home network address; With dispensing device 1102, be used for receiving the address simultaneously when being the multicast packet of the new network address and the former network address when described receiving system, then send and end the control message to former network access equipment, because the type of this termination control message can be discerned by Delivery Function, so the setting to this source address does not have special requirement, this source address can be made as the former network address, also can discern this termination control message at Delivery Function is that the mobile multicast recipient is made as the new network address with this source address when sending.Former network access equipment receives this termination control message, then ends the forwarding of former multicast packet.
Figure 12 shows the network access equipment 1200 of the described termination redundant multicast data of enforcement of the present invention transmission method, and this network access equipment comprises receiving system 1201, is used for the termination control message that mobile terminal receive sends; With abortion means 1202, be used for behind the termination control message that receives this portable terminal transmission, ending to this terminal multicast data forwarding.
One of ordinary skill in the art will appreciate that, the all or part of step of the method for the realization embodiment of the invention can be finished by the relevant hardware of program command, described program can be stored in the read/write memory medium, and this program is carried out step corresponding in the above-mentioned communication means when carrying out.Described storage medium can be: ROM/RAM, magnetic disc, CD etc.
Although the present invention by with reference to the accompanying drawings and mode in conjunction with the preferred embodiments describe in detail, the present invention is not limited to this.Under the prerequisite that does not break away from spirit of the present invention and essence, those of ordinary skill in the art can carry out the distortion and the change of various equivalences to embodiments of the invention, and these distortion and change are all in covering scope of the present invention.
Claims (11)
1. a method of ending the redundant multicast data transmission is characterized in that, comprising:
When the mobile multicast recipient moves to second network from first network, and when described mobile multicast recipient receives from the multicast packet of described second network and described first network, then send termination control message, notify described network access equipment to end to the multicast packet of described mobile multicast recipient forwarding from described first network to being responsible for the network access equipment of forwarding from the multicast packet of described first network.
2. the method for claim 1 is characterized in that, described termination control message is that source address is that the group of the address of described mobile multicast recipient in described first network is left the control message.
3. the method for claim 1, described termination control message are type field, code field or one of them reserved field that the group that adopts Internet Group Management Protocol or multicast monitoring discovery is left the control message to be set at be used for discerning the control message of this message for the numerical value of ending the control message.
4. as each the described method in the claim 1 to 3, it is characterized in that described first network is field network or home network,
Wherein, when described first network is field network, if described mobile multicast recipient utilizes tunneling mechanism from described field network receiving multicast data, then described network access equipment is the home network access device, if described mobile multicast recipient utilizes the multicast routing mechanism of optimization from described field network receiving multicast data, then described network access equipment is the network access equipment that inserts described field network
When described first network was home network, described network access equipment was the home network access device.
5. mobile device, described mobile device moves to second network from first network, it is characterized in that, and described mobile device comprises:
Receiving system is used to receive the multicast packet from described first network and described second network; With
Dispensing device, be used for when described receiving system receives multicast packet from described first network and described second network, send termination control message to being responsible for the network access equipment of forwarding, notify described network access equipment to end to the multicast packet of described mobile multicast recipient forwarding from described first network from the multicast packet of described first network.
6. mobile device as claimed in claim 5 is characterized in that, described termination control message is that source address is that the group of the address of described mobile multicast recipient in described first network is left the control message.
7. mobile device as claimed in claim 5, described termination control message are type field, code field or one of them reserved field that the group that adopts Internet Group Management Protocol or multicast monitoring discovery is left the control message to be set at be used for discerning the control message of this message for the numerical value of ending the control message.
8. a method of ending the redundant multicast data transmission is characterized in that, comprising:
Reception is from mobile multicast recipient's termination control message, and described mobile multicast recipient moves to second network from first network, and when receiving multicast packet from described second network and described first network, then sends described termination control message;
Termination is to the multicast packet of described mobile multicast recipient forwarding from described first network.
9. method as claimed in claim 8 is characterized in that, described termination control message is that source address is that the group of the address of described mobile multicast recipient in described first network is left the control message.
10. method as claimed in claim 8, it is characterized in that, described termination is before the multicast packet of described mobile multicast recipient forwarding from described first network, and described method also comprises: judge whether to exist other recipients that share the conversion link of corresponding first network with described mobile multicast recipient;
If there is no described other recipients then carry out described termination to the operation of described mobile multicast recipient forwarding from the multicast packet of described first network.
11. a network access equipment is characterized in that, comprising:
Receiving system is used to receive the termination control message that is sent as the mobile multicast recipient when first network moves to second network and receive multicast packet from described second network and described first network; With
Abortion means is used for ending to the multicast packet of described mobile multicast recipient forwarding from described first network after described receiving system receives described termination control message.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102710745A (en) * | 2012-04-25 | 2012-10-03 | 浙江宇视科技有限公司 | Live alternate switching method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102710745A (en) * | 2012-04-25 | 2012-10-03 | 浙江宇视科技有限公司 | Live alternate switching method and device |
| CN102710745B (en) * | 2012-04-25 | 2015-10-14 | 浙江宇视科技有限公司 | A kind of live wheel blanking method and device |
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