CN101909276A - Mobile multicast switching method, system and relevant equipment - Google Patents
Mobile multicast switching method, system and relevant equipment Download PDFInfo
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- CN101909276A CN101909276A CN2009100865157A CN200910086515A CN101909276A CN 101909276 A CN101909276 A CN 101909276A CN 2009100865157 A CN2009100865157 A CN 2009100865157A CN 200910086515 A CN200910086515 A CN 200910086515A CN 101909276 A CN101909276 A CN 101909276A
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Abstract
The invention discloses a mobile multicast switching method, a mobile multicast switching system and mobile multicast switching equipment in order to solve the problems of delay and loss of multicast data in the traditional mobile multicast switching process. The method comprises the following steps that: according to switch-to-second MAG request identifier information reported when a mobile multicast node initiates switching, a first MAG sends a first HI signaling message to a second MAG so as to request the establishment of a first bidirectional tunnel between the first and second MAGs; according to the received first HI signaling message, the second MAG establishes the first bidirectional tunnel and feeds the first HI signaling message back to the first MAG when the establishment of the first bidirectional tunnel is successful, and requests the first MAG to transmit the multicast data of the mobile multicast node through the established first bidirectional tunnel; and after the first bidirectional tunnel is established successfully, the mobile multicast node is switched from the first MAG to the second MAG. The transmission delay of the multicast data in the mobile multicast switching process and the loss of the multicast data are reduced.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to a kind of mobile multicast handoff technique.
Background technology
Along with the development of mobile communication technology, increasing user is connected in the network by mobile device, and wishes and can conduct interviews to network whenever and wherever possible.The mobility support of terminal has been become the inexorable trend of network development, and how have big quantity research to pay close attention to network at present provides the mobility support for terminal.Multicasting technology is owing to the network utilization height, save advantages such as resource, extensibility are strong, in using, new networks such as video conference, file distributing, real time information issue brought into play huge effect, for example in typical mobile IPTV (Web TV) used, a large number of users can obtain the audio/video stream data of net distribution by multicasting technology.IETF (Internet Engineering Task Force, the Internet engineering duty group) at MIPv6 (MobileInternet Protocol, Mobile Internet Protocol) two kinds of basic multicast mechanism: MIP-BT (Bi-directional Tunnel of mobility support have been advised providing in for terminal, bidirectional tunnel) mechanism and MIP-RS (Remote Subscription, long-range adding) mechanism.In MIP-BT mechanism, need to set up bidirectional tunnel between mobile multicast node and the home agent thereof and add/withdraw from multicast group, and send and receiving multicast data by this bidirectional tunnel; In MIP-RS mechanism, mobile multicast node changes after the network of living at every turn, all needs to join in the multicast group again, and recomputates multicast tree by multicast protocol.But above-mentioned two kinds of multicast mechanisms all exist big defective, the new problem that can't effectively solve mobile multicast and faced.In addition, MIPv6 is a kind of Host Based mobility management protocol, needs terminal to possess the mobile management function, and this has just increased the difficulty that mobile multicast is disposed and promoted.
Based on the problems referred to above, IETF has proposed Extended Protocol PMIPv6 (the Proxy MobileIPv6 of MIPv6, proxy mobile internet protocol), MAG (Mobile Access Gateway, Mobile Access Gateway) simulation home network, to subordinate's MN (Mobile Node, mobile node) announcement home network prefix, MN is thought be in home network all the time; MAG by agent binding update (Proxy BindingUpdate, PBU) process replaces MN to register to the LMA with home agent function (Local MobilityAnchor, local mobile anchor); LMA accepts the registration that MAG replaces MN, at banding cache tabulation (Binding Cache Entry, BCE) mapping relations of the interface IP address of the address information of store M N and MAG in are finally set up the packet that a bidirectional tunnel is used to transmit MN between MAG and LMA.PMIPv6 is as a kind of based on network local mobile management technology, the mobile management function is transferred to network side from end side, MN only need possess general mobility functions (for example move detect) self the mobile MAG of informing is got final product, do not need to participate in mobile management, help alleviating the burden of terminal, be convenient to centralized control, for the distribution of multicast packet provides good condition.
In the mobile multicast scene, not only need to manage dynamic mobile multicast node, foundation and safeguard multicast tree, also need to solve the problems such as dynamic change of mobile multicast node position.A kind of mobile multicast switching flow based on PMIPv6 is provided in the prior art, suppose that mobile multicast node moves to the compass of competency of n-MAG (new MAG, new Mobile Access Gateway) from the compass of competency of p-MAG (previousMAG, old Mobile Access Gateway), as shown in Figure 1, comprise step:
S100, mobile multicast node are confirmed to need to initiate to switch by moving to detect, and request switches to n-MAG;
S101, mobile multicast node are switched to n-MAG from p-MAG, and n-MAG can learn the incident of adhering to of mobile multicast node from network side or end side, thereby obtains node identification, the Profile information such as (configuration files) of mobile multicast node;
S102, mobile multicast node send RS (Router Solicitation, route requests) signaling message to n-MAG;
S103～S104, n-MAG receives MLD Query (the MulticastListener Discovery Protocol Report that LMA regularly sends, the inquiry of multicast listener discovery agreement) after the message, send PBU (the Proxy Binding Update of multicast expansion to LMA, agent binding update) signaling message, MLD Report (MLD report) message comprising mobile multicast node, the multicast state information that has comprised mobile multicast node in this MLD Report message, the mobile multicast node address of multicast group for example, the multicast source address of multicast group etc., the PBU signaling message of multicast expansion be used to ask to add multicast group and set up n-MAG and LMA between bidirectional tunnel;
Represent the multicast of PBU message is expanded by in PBU message, increasing new flag bit, and in the Mobility of PBU message Options (mobility option) field, comprise the MLDReport message of mobile multicast node; N-MAG can obtain above-mentioned multicast state information by the context switch agreement from p-MAG, perhaps n-MAG can directly obtain above-mentioned multicast state information from PS (Policy Server, strategic server).
S105, LMA return PBA (Proxy Binding Acknowledgement, agent binding is confirmed) signaling message to n-MAG;
So far, the bidirectional tunnel that is used to transmit the multicast packet of mobile multicast node between n-MAG and the LMA is set up successfully.
S106, n-MAG return RA (Router Advertisement, advertising of route) signaling message to mobile multicast node.
The multicast packet of S107, mobile multicast node transmits by the bidirectional tunnel of setting up between n-MAG and the LMA, and is concrete, and multicast packet sends to n-MAG by LMA by this bidirectional tunnel, and n-MAG is transmitted to mobile multicast node again;
S108～S110, mobile multicast node receive MLD Query (MLD query messages) that n-MAG sends afterwards, return MLD Repot message to n-MAG, and this MLD Repot message is transmitted to LMA by n-MAG by this bidirectional tunnel again.
Existing mobile multicast switching flow based on PMIPv6, in mobile multicast node when p-MAG switches to n-MAG, can't receive multicast packet from p-MAG or n-MAG, owing to pass through the bidirectional tunnel multicast data transmission between MAG and the LMA, so only n-MAG add multicast group and and LMA between bidirectional tunnel just can proceed the transmission of multicast packet after setting up successfully, inevitably caused the delay of multicast packet in the mobile multicast handoff procedure and lost, reduced the performance of mobile multicast, for the network application that real-time is had relatively high expectations, this problem is particularly outstanding.
Summary of the invention
The invention provides a kind of mobile multicast switching method and system, in order to delay that solves multicast packet in the existing mobile multicast handoff procedure and the problem of losing.
Accordingly, the invention provides a kind of Mobile Access Gateway equipment.
Mobile multicast switching method provided by the invention comprises:
The identification information of the 2nd MAG that the request that the first Mobile Access Gateway MAG reports when initiating to switch according to mobile multicast node switches to, send first to the 2nd MAG and switch initiation HI signaling message, first bidirectional tunnel between a MAG and the 2nd MAG is set up in request;
Described the 2nd MAG sets up described first bidirectional tunnel according to a HI signaling message that receives, and when first bidirectional tunnel is set up successfully, return the first handover acknowledge HA signaling message to a MAG, ask a MAG to transmit the multicast packet of described mobile multicast node by first bidirectional tunnel of setting up;
After first bidirectional tunnel was set up successfully, described mobile multicast node was switched to the 2nd MAG from a MAG.
Mobile multicast switched system provided by the invention comprises mobile multicast node, the first Mobile Access Gateway MAG and the 2nd MAG, wherein:
Described mobile multicast node, be used for when initiate switching the identification information that a MAG under current reports the 2nd MAG that request switches to, and after first bidirectional tunnel that is used for multicast data forwarding between a MAG and the 2nd MAG sets up successfully, switch to the 2nd MAG from a MAG;
A described MAG is used for the identification information of the 2nd MAG that reports according to described mobile multicast node, sends first to the 2nd MAG and switches and initiate the HI signaling message, and described first bidirectional tunnel is set up in request;
Described the 2nd MAG, be used for setting up described first bidirectional tunnel according to a HI signaling message that receives, and when first bidirectional tunnel is set up successfully, return the first handover acknowledge HA signaling message to a MAG, ask a MAG to transmit the multicast packet of described mobile multicast node by first bidirectional tunnel of setting up.
Mobile Access Gateway equipment provided by the invention comprises:
Transmitting element, the identification information that is used for the new Mobile Access Gateway MAG that switches to according to the request that mobile multicast node reports when initiate switching, send first to new MAG and switch initiation HI signaling message, first bidirectional tunnel between this MAG and the new MAG is set up in request;
Receiving element, be used to receive the first handover acknowledge HA signaling message that new MAG returns when first bidirectional tunnel is set up successfully, a described HA signaling message is used to ask this MAG to transmit the multicast packet of described mobile multicast node by first bidirectional tunnel of setting up.
Mobile Access Gateway equipment provided by the invention comprises:
Receiving element is used to receive initiate that the mobile multicast node the switched old MAG under current sends first switch and initiate the HI signaling message, and a described HI signaling message is used to ask to set up first bidirectional tunnel between old MAG and this MAG;
Processing unit, be used for setting up described first bidirectional tunnel according to a HI signaling message that receives, and when first bidirectional tunnel is set up successfully, return a HA signaling message to described old MAG, ask old MAG to transmit the multicast packet of described mobile multicast node by first bidirectional tunnel of setting up.
Mobile multicast switching method provided by the invention and system, at the mobile multicast node of initiating to switch, set up first bidirectional tunnel that is used for multicast data forwarding between the 2nd MAG that a MAG under current and request switch in advance, make mobile multicast node before second bidirectional tunnel between a MAG and the LMA is set up successfully, can continue receiving multicast data by first bidirectional tunnel, reduce the transmission delay of multicast packet in the mobile multicast handoff procedure, reduced loss of multicast data.
Description of drawings
Fig. 1 is based on the mobile multicast switching flow figure of PMIPv6 in the prior art;
Fig. 2 is a mobile multicast switching method flow chart in the embodiment of the invention;
Fig. 3 is the multicast expansion schematic diagram of HI signaling message;
Fig. 4 is the multicast expansion schematic diagram of Mobility Options field in the HI signaling message;
Fig. 5 is based on the switching flow figure of the HI signaling message of multicast expansion in the embodiment of the invention;
Fig. 6 is a mobile multicast switched system block diagram in the embodiment of the invention;
Fig. 7 is the structured flowchart of a MAG in the embodiment of the invention;
Fig. 8 is the structured flowchart of the 2nd MAG in the embodiment of the invention.
Embodiment
Existing mobile multicast switching flow based on PMIPv6, when mobile multicast node when p-MAG switches to n-MAG, n-MAG need at first obtain the multicast state information of mobile multicast node, and according to the multicast state information request add multicast group and set up n-MAG and LMA between bidirectional tunnel, after bidirectional tunnel between n-MAG and LMA is set up successfully, just can proceed the transmission of multicast packet, inevitably cause the delay of multicast packet in the mobile multicast handoff procedure and lost, reduced the performance of mobile multicast.
For delay that solves multicast packet in the mobile multicast handoff procedure and the problem of losing, make mobile multicast node in handoff procedure, can continue receiving multicast data, the embodiment of the invention proposes: utilize HI (Handover Initiate, switch and initiate) signaling message and HA (Handover Acknowledgement, handover acknowledge) signaling message is set up the bidirectional tunnel between p-MAG and the n-MAG, when mobile multicast node is initiated to switch, by HI signaling message notice p-MAG, p-MAG sends the request of HI signaling message to n-MAG and sets up bidirectional tunnel between p-MAG and the n-MAG, and n-MAG confirms by returning the HA signaling message.After bidirectional tunnel between p-MAG and the n-MAG is set up successfully, mobile multicast node is switched to n-MAG from p-MAG again, p-MAG can will send to the transmitting multicast data of mobile multicast node to n-MAG by the bidirectional tunnel between p-MAG and the n-MAG, the multicast packet that n-MAG will receive and buffer memory p-MAG transmits, after p-MAG switches to n-MAG, send the multicast packet that p-MAG transmits to it in mobile multicast node again.By setting up the bidirectional tunnel between a p-MAG and the n-MAG before switching in mobile multicast node, make mobile multicast node before the bidirectional tunnel between n-MAG and the LMA is set up successfully, can continue receiving multicast data.
As shown in Figure 2, the embodiment of the invention provides a kind of mobile multicast switching method, supposes that mobile multicast node moves to the compass of competency of n-MAG from the compass of competency of p-MAG, comprising:
The identification information of the n-MAG that the request that S201, p-MAG report when initiating to switch according to mobile multicast node switches to sends the HI signaling message to n-MAG, and the bidirectional tunnel between p-MAG and the n-MAG is set up in request;
In concrete the enforcement, mobile multicast node can be confirmed to need to initiate to switch by moving to detect, and the identification information of node identification and the n-MAG that switches to of request is carried in the HI signaling message reports p-MAG, p-MAG is according to the identification information of the n-MAG that carries in the HI signaling message, send the HI signaling message to n-MAG, with consistent in the prior art, need to carry the node identification of mobile multicast node in the HI signaling message that p-MAG sends.
The HI signaling message that S202, n-MAG basis receives is set up the bidirectional tunnel between p-MAG and the n-MAG, and when this bidirectional tunnel is set up successfully, returning the HA signaling message to p-MAG, request p-MAG transmits the multicast packet of mobile multicast node by the bidirectional tunnel of setting up;
In concrete the enforcement, n-MAG is according to the HI signaling message that receives, and sets up bidirectional tunnel between p-MAG and the n-MAG by distributing tunnel Taoist monastic name, the corresponding address binding information of record etc.;
N-MAG transmits flag bit F by being provided with in the HA signaling message, request p-MAG transmits the multicast packet of mobile multicast node, with consistent in the prior art, need carry the node identification of mobile multicast node in the HA signaling message equally, expression is to the affirmation of corresponding HI signaling message;
After S203, the bidirectional tunnel between p-MAG and n-MAG were set up successfully, mobile multicast node was switched to n-MAG from p-MAG;
By mutual HI signaling message and HA signaling message between p-MAG and the n-MAG, bidirectional tunnel between p-MAG and the n-MAG can successfully be set up, the HA signaling message that p-MAG returns according to n-MAG promptly triggers the switching of mobile multicast node after learning that bidirectional tunnel is set up successfully;
Follow-up, p-MAG can transmit the multicast packet of mobile multicast node by the bidirectional tunnel of setting up to n-MAG; N-MAG can receive and the multicast packet of the mobile multicast node that buffer memory p-MAG transmits, and in mobile multicast node after p-MAG switches to n-MAG, send the multicast packet that p-MAG transmits to mobile multicast node.
By above-mentioned mobile multicast switching method, can guarantee that mobile multicast node can continual receiving multicast data in handoff procedure, reduce the delay of multicast packet in the mobile multicast handoff procedure, reduce loss of multicast data, thereby satisfy the real-time requirement of network application.
According to existing mobile multicast switching flow based on PMIPv6, in mobile multicast node after p-MAG switches to n-MAG, n-MAG need use the PBU signaling message request of multicast expansion to add multicast group and set up n-MAG and LMA between bidirectional tunnel.Under the mobile multicast environment, need to comprise the multicast state information of mobile multicast node in the PBU signaling message of multicast expansion, have only after mobile multicast node switches to n-MAG, n-MAG could obtain its multicast state information; And n-MAG receives after the MLD Query message of LMA transmission regularly, just sends the PBU signaling message of multicast expansion to LMA.As seen, the process of the setting up complexity of bidirectional tunnel makes handover delay bigger between the process of n-MAG adding multicast group and n-MAG and the LMA.
Further propose in the embodiment of the invention: by HI signaling message and HA signaling message are carried out the multicast expansion, in HI signaling message and HA signaling message, increase the multicast state information of mobile multicast node, when making that bidirectional tunnel between p-MAG and n-MAG is set up, multicast state information is passed to n-MAG, n-MAG is after this multicast state information of acquisition, can be directly PBU signaling message by the multicast expansion add multicast group and set up n-MAG and LMA between bidirectional tunnel, and needn't wait until that LMA just replys after regularly sending MLD Query message, thereby can quicken the foundation of bidirectional tunnel between n-MAG and the LMA, reduce handover delay; And, after the bidirectional tunnel between n-MAG and LMA is set up successfully, discharging the bidirectional tunnel between p-MAG and the n-MAG, thereby guarantee that n-MAG adds after the multicast group, mobile multicast node can be according to existing procedure from the normal receiving multicast data of n-MAG.
Below, expanding to the multicast spreading method of example explanation HI signaling message and HA signaling message with the multicast of HI signaling message, the multicast expansion of HA signaling message is in full accord with the multicast expansion of HI signaling message, specifically repeats no more.
The multicast expansion of HI signaling message sees also Fig. 3, increases new multicast flags position M in the HI signaling message, and expression is carried out the multicast expansion to the HI signaling message.As can be seen from Figure 3, the HI signaling message of multicast expansion comprise Code, buffer memory flag bit U, transmit flag bit F, newly-increased multicast flags position M, Mobility Options fields such as (mobility options).The explanation of each field is as shown in table 1 in the HI signaling message.
Table 1
Simultaneously, in the Mobility of HI signaling message Options field, increase the multicast state information of mobile multicast node, specifically comprise the mobile multicast node address of multicast group, the information such as multicast source address of multicast group.Expansion specifically sees also Fig. 4 to the multicast of Mobility Options field, and Multicast Address represents the mobile multicast node address of multicast group, Source Address[1] ... Source Address[N] multicast source address of expression multicast group.
HI signaling message and HA signaling message are being carried out with specific embodiment mobile multicast switching method being elaborated on the basis of multicast expansion.As shown in Figure 5, comprise following handling process:
S501, mobile multicast node confirm to need to initiate to switch by moving to detect, and send the HI signaling message to p-MAG, the identification information of the n-MAG that node identification and the request by HI signaling message report mobile multicast node switches to.
S502, p-MAG send the HI signaling message of multicast expansion to n-MAG, the bidirectional tunnel between p-MAG and the n-MAG is set up in request, the multicast state information that comprises mobile multicast node in the HI signaling message of multicast expansion, with consistent in the prior art, also need to carry the node identification of mobile multicast node in the HI signaling message of multicast expansion.
S503, the HI signaling message that the n-MAG basis receives is set up the bidirectional tunnel between p-MAG and the n-MAG, and when setting up successfully, this bidirectional tunnel returns the HA signaling message that multicast is expanded to p-MAG, expression is to the affirmation of the HI signaling message of multicast expansion, the multicast state information that comprises mobile multicast node in the HA signaling message of multicast expansion, with consistent in the prior art, the node identification that also needs to carry mobile multicast node in the HA signaling message of multicast expansion, and n-MAG is by being provided with the forwarding flag bit F of HA signaling message, the multicast packet that request p-MAG transmits this mobile multicast node by the p-MAG and the bidirectional tunnel between the n-MAG of foundation, the concrete flag bit F that need transmit is set to 1, and the Code value is 2.
After bidirectional tunnel between S504, p-MAG and the n-MAG was set up successfully, p-MAG can give n-MAG with the transmitting multicast data of mobile multicast node by the bidirectional tunnel between p-MAG and the n-MAG, and n-MAG receives the also multicast packet of buffer memory mobile multicast node.
S505, mobile multicast node are switched to n-MAG from p-MAG;
When p-MAG receives the HA signaling message of the multicast expansion that n-MAG returns, promptly trigger the switching of mobile multicast node, mobile multicast node is switched to n-MAG from p-MAG under the triggering of p-MAG.
S506, in mobile multicast node after p-MAG switches to n-MAG, n-MAG sends the multicast packet that p-MAG transmits to mobile multicast node.
S507, n-MAG send the PBU signaling message of multicast expansion to LMA, the multicast state information of the mobile multicast node that comprises in the PBU signaling message of this multicast expansion, being n-MAG obtains from the HI signaling message of multicast expansion, the PBU signaling message of multicast expansion be used to ask to add multicast group and set up n-MAG and LMA between bidirectional tunnel;
Need to prove, if the HI signaling message is not carried out the multicast expansion, then can with prior art in consistent, n-MAG receives after the MLD Query message of LMA transmission regularly, send the PBU signaling message of multicast expansion to LMA, MLD Report message comprising mobile multicast node, the multicast state information that has comprised mobile multicast node in this MLD Report message, n-MAG can obtain above-mentioned multicast state information by the context switch agreement from p-MAG, perhaps n-MAG can directly obtain above-mentioned multicast state information from PS.
The PBU signaling message that S508, LMA expand according to the multicast that receives is set up the bidirectional tunnel between n-MAG and the LMA, and returns the PBA signaling message to n-MAG when this bidirectional tunnel is set up successfully, and expression is to the affirmation of the PBU signaling message of multicast expansion;
With consistent in the prior art, LMA is according to the PBU signaling message of the multicast that receives expansion, sets up bidirectional tunnel between n-MAG and the LMA by distributing tunnel Taoist monastic name, the corresponding address binding information of record etc.
After bidirectional tunnel between S509, n-MAG and the LMA is set up successfully, can be by the multicast packet of the transmission of the bidirectional tunnel between n-MAG and LMA mobile multicast node.
S510, n-MAG send the HI signaling message to p-MAG, request p-MAG finish to transmit the multicast packet of mobile multicast node and discharge p-MAG and n-MAG between bidirectional tunnel.
This HI signaling message that S511, p-MAG basis receives discharges the bidirectional tunnel between p-MAG and the n-MAG, and returns the HA signaling message to n-MAG when this bidirectional tunnel discharges successfully.
P-MAG and n-MAG are by mutual HI signaling message and HA signaling message, discharge the bidirectional tunnel between p-MAG and the n-MAG, finish the forwarding of p-MAG to multicast packet, thereby guarantee that n-MAG adds after the multicast group, mobile multicast node can be according to existing procedure from the normal receiving multicast data of n-MAG.
Based on same inventive concept, a kind of mobile multicast switched system also is provided in the embodiment of the invention, because the principle that this mobile multicast switched system is dealt with problems is consistent with mobile multicast switching method, so this system implementation can repeat part and repeat no more referring to the enforcement of method.
As shown in Figure 6, the mobile multicast switched system that the embodiment of the invention provides comprises mobile multicast node 601, a MAG 602 and the 2nd MAG 603, wherein:
Mobile multicast node 601, be used for when initiate switching the identification information that a MAG 602 under current reports the 2nd MAG 603 that request switches to, and after first bidirectional tunnel that is used for multicast data forwarding between a MAG 602 and the 2nd MAG603 sets up successfully, switch to the 2nd MAG 603 from a MAG 602;
The one MAG 602 is used for the identification information of the 2nd MAG 603 that reports according to mobile multicast node 601, sends a HI signaling message to the 2nd MAG 603, and this first bidirectional tunnel is set up in request;
The 2nd MAG 603, be used for setting up this first bidirectional tunnel according to a HI signaling message that receives, and when first bidirectional tunnel is set up successfully, return a HA signaling message to a MAG 602, ask a MAG 602 to transmit the multicast packet of mobile multicast node 601 by first bidirectional tunnel of setting up.
If need to send multicast packet to mobile multicast node after first bidirectional tunnel is set up successfully, a MAG 602 also is used for transmitting to the 2nd MAG 603 by first bidirectional tunnel of setting up the multicast packet of mobile multicast node 601;
The 2nd MAG 603 also is used to receive and multicast packet that buffer memory the one MAG 602 transmits, and in mobile multicast node 601 after a MAG 602 switches to the 2nd MAG 603, send the multicast packet that a MAG 602 transmits to mobile multicast node 601.
In concrete the enforcement, this system also comprises LMA604, wherein:
The one MAG 602 also is used for comprising at a HI signaling message that sends the multicast state information of mobile multicast node 601;
The 2nd MAG 603, also be used in mobile multicast node 601 after a MAG 602 switches to the 2nd MAG 603, send the PBU signaling message of multicast expansion to LMA604, request adds multicast group and sets up second bidirectional tunnel between the 2nd MAG 603 and the LMA, comprises the multicast state information of the mobile multicast node of obtaining from a HI signaling message 601 in the PBU signaling message of multicast expansion;
LMA 604, be used for setting up this second bidirectional tunnel according to the PBU signaling message of the multicast expansion that receives, and return the PBA signaling message to the 2nd MAG 603 when second bidirectional tunnel is set up successfully.
If need to send multicast packet to mobile multicast node after second bidirectional tunnel is set up successfully, LMA 604, also are used for sending to the 2nd MAG 603 by second bidirectional tunnel of setting up the multicast packet of mobile multicast node 601;
The 2nd MAG 603, the transmitting multicast data that also is used for LMA is sent is to mobile multicast node 601.
Among the embodiment, the 2nd MAG 603 also is used for after second bidirectional tunnel is set up successfully, sends the 2nd HI signaling message to a MAG 602, asks a MAG 602 to finish to transmit the multicast packet of mobile multicast node 601 and discharge first bidirectional tunnel;
The one MAG 602 also is used for discharging this first bidirectional tunnel according to the 2nd HI signaling message that receives, and returns the 2nd HA signaling message to the 2nd MAG 602 when first bidirectional tunnel discharges successfully.
Based on same technical conceive, the embodiment of the invention also provides corresponding M AG equipment, for a MAG equipment, may be as a MAG (being p-MAG) of the mobile multicast node of initiating to switch, also possibility is as the 2nd MAG (being n-MAG) of the mobile multicast node of initiating to switch.
When MAG equipment during as a MAG of mobile multicast node, as shown in Figure 7, this MAG equipment comprises:
Transmitting element 701 is used for the identification information of the new MAG that switches to according to the request that mobile multicast node reports when initiate switching, send a HI signaling message to new MAG, and this MAG and new first bidirectional tunnel between the MAG are set up in request;
Receiving element 702, be used to receive the first handover acknowledge HA signaling message that new MAG returns when first bidirectional tunnel is set up successfully, wherein, a HA signaling message is used to ask this MAG to transmit the multicast packet of this mobile multicast node by first bidirectional tunnel of setting up.
In concrete the enforcement, this MAG equipment also comprises:
When MAG equipment during as the 2nd MAG of mobile multicast node, as shown in Figure 8, this MAG equipment comprises:
Receiving element 801 is used to receive and initiates the HI signaling message that the mobile multicast node the switched old MAG under current sends, and wherein a HI signaling message is used to ask to set up first bidirectional tunnel between old MAG and this MAG;
In concrete the enforcement, this MAG equipment also comprises:
In concrete the enforcement, this MAG equipment also comprises interface unit 804, wherein:
The multicast state information that comprises this mobile multicast node in the HI signaling message that receiving element 801 receives;
Accordingly, the embodiment of the invention also provides a kind of mobile multicast node equipment, comprising:
Report the unit, be used for when initiate switching the identification information that a MAG under current reports the 2nd MAG that request switches to;
Switch control unit, the bidirectional tunnel that is used for being used for multicast data forwarding between a MAG and the 2nd MAG switches to the 2nd MAG from a MAG after setting up successfully.
The mobile multicast switching method that the embodiment of the invention provides based on PMIPv6, at the mobile multicast node of initiating to switch, set up a bidirectional tunnel that is used for multicast data forwarding between the n-MAG that p-MAG under current and request switch in advance, make mobile multicast node before the bidirectional tunnel between n-MAG and the LMA is set up successfully, still can continue receiving multicast data by the bidirectional tunnel between p-MAG and the n-MAG, reduce the transmission delay of multicast packet, reduced loss of multicast data;
P-MAG can be by the HI signaling message of multicast expansion, setting up between p-MAG and the n-MAG in the bidirectional tunnel, the multicast state information of mobile multicast node is sent to n-MAG, be convenient to follow-up n-MAG utilize this multicast state information to add multicast group and set up n-MAG and LMA between bidirectional tunnel, quickened the process of setting up of bidirectional tunnel between process that n-MAG adds multicast group and n-MAG and the LMA, reduce handover delay, reduced the mobile multicast expense;
After bidirectional tunnel between n-MAG and LMA is set up successfully, discharge the bidirectional tunnel between p-MAG and the n-MAG, can guarantee that n-MAG adds after the multicast group, mobile multicast node can be according to existing procedure from the normal receiving multicast data of n-MAG.
It is apparent to those skilled in the art that the embodiment of the invention can be provided as method, system, equipment or computer program.Therefore, the present invention can adopt complete hardware embodiment, complete software implementation example or in conjunction with the form of the embodiment of software and hardware.And the present invention can adopt the form that goes up the computer program of implementing in one or more computer-usable storage medium comprising computer usable program code (including but not limited to magnetic disc store, CD-ROM, optical memory etc.).
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (14)
1. a mobile multicast switching method is characterized in that, comprising:
The identification information of the 2nd MAG that the request that the first Mobile Access Gateway MAG reports when initiating to switch according to mobile multicast node switches to, send first to the 2nd MAG and switch initiation HI signaling message, first bidirectional tunnel between a MAG and the 2nd MAG is set up in request;
Described the 2nd MAG sets up described first bidirectional tunnel according to a HI signaling message that receives, and when first bidirectional tunnel is set up successfully, return the first handover acknowledge HA signaling message to a MAG, ask a MAG to transmit the multicast packet of described mobile multicast node by first bidirectional tunnel of setting up;
After first bidirectional tunnel was set up successfully, described mobile multicast node was switched to the 2nd MAG from a MAG.
2. the method for claim 1 is characterized in that, also comprises:
A described MAG transmits the multicast packet of described mobile multicast node to the 2nd MAG by first bidirectional tunnel of setting up;
The multicast packet that described the 2nd MAG receives and buffer memory the one MAG transmits, and in described mobile multicast node after a MAG switches to the 2nd MAG, send the multicast packet that a MAG transmits to described mobile multicast node.
3. method as claimed in claim 1 or 2 is characterized in that, comprises the multicast state information of described mobile multicast node in the described HI signaling message; And
, after switching to the 2nd MAG, a MAG also comprises in described mobile multicast node:
Described the 2nd MAG sends the agent binding update PBU signaling message of multicast expansion to local mobile anchor LMA, request adds multicast group and sets up second bidirectional tunnel between the 2nd MAG and the LMA, comprises the multicast state information of the described mobile multicast node of obtaining from a described HI signaling message in the PBU signaling message of described multicast expansion;
Described LMA sets up described second bidirectional tunnel according to the PBU signaling message of the multicast expansion that receives, and returns agent binding to described the 2nd MAG and confirm the PBA signaling message when second bidirectional tunnel is set up successfully.
4. method as claimed in claim 3 is characterized in that, also comprises:
Described LMA sends the multicast packet of mobile multicast node to the 2nd MAG by second bidirectional tunnel of setting up;
The transmitting multicast data that described the 2nd MAG sends LMA is to described mobile multicast node.
5. as claim 3 or 4 described methods, it is characterized in that, after described second bidirectional tunnel is set up successfully, discharge first bidirectional tunnel between a MAG and the 2nd MAG.
6. method as claimed in claim 5 is characterized in that, first bidirectional tunnel between described release the one MAG and the 2nd MAG specifically comprises:
Described the 2nd MAG sends the 2nd HI signaling message to a MAG, asks a MAG to finish to transmit the multicast packet of described mobile multicast node and discharge described first bidirectional tunnel;
A described MAG discharges described first bidirectional tunnel according to the 2nd HI signaling message that receives, and returns the 2nd HA signaling message to the 2nd MAG when first bidirectional tunnel discharges successfully.
7. a mobile multicast switched system is characterized in that, comprises mobile multicast node, the first Mobile Access Gateway MAG and the 2nd MAG, wherein:
Described mobile multicast node, be used for when initiate switching the identification information that a MAG under current reports the 2nd MAG that request switches to, and after first bidirectional tunnel that is used for multicast data forwarding between a MAG and the 2nd MAG sets up successfully, switch to the 2nd MAG from a MAG;
A described MAG is used for the identification information of the 2nd MAG that reports according to described mobile multicast node, sends first to the 2nd MAG and switches and initiate the HI signaling message, and described first bidirectional tunnel is set up in request;
Described the 2nd MAG, be used for setting up described first bidirectional tunnel according to a HI signaling message that receives, and when first bidirectional tunnel is set up successfully, return the first handover acknowledge HA signaling message to a MAG, ask a MAG to transmit the multicast packet of described mobile multicast node by first bidirectional tunnel of setting up.
8. system as claimed in claim 7 is characterized in that, also comprises local mobile anchor LMA, wherein:
A described MAG also is used for comprising at a HI signaling message that sends the multicast state information of described mobile multicast node;
Described the 2nd MAG, also be used in described mobile multicast node after a MAG switches to the 2nd MAG, send the agent binding update PBU signaling message of multicast expansion to described LMA, request adds multicast group and sets up second bidirectional tunnel between the 2nd MAG and the LMA, comprises the multicast state information of the described mobile multicast node of obtaining from a described HI signaling message in the PBU signaling message of described multicast expansion;
Described LMA is used for setting up described second bidirectional tunnel according to the PBU signaling message of the multicast expansion that receives, and returns agent binding to described the 2nd MAG and confirm the PBA signaling message when second bidirectional tunnel is set up successfully.
9. system as claimed in claim 8 is characterized in that,
Described the 2nd MAG also is used for sending the 2nd HI signaling message to a MAG after described second bidirectional tunnel is set up successfully, asks a MAG to finish to transmit the multicast packet of described mobile multicast node and discharge described first bidirectional tunnel;
A described MAG also is used for discharging described first bidirectional tunnel according to the 2nd HI signaling message that receives, and returns the 2nd HA signaling message to described the 2nd MAG when first bidirectional tunnel discharges successfully.
10. a Mobile Access Gateway equipment is characterized in that, comprising:
Transmitting element, the identification information that is used for the new Mobile Access Gateway MAG that switches to according to the request that mobile multicast node reports when initiate switching, send first to new MAG and switch initiation HI signaling message, first bidirectional tunnel between this MAG and the new MAG is set up in request;
Receiving element, be used to receive the first handover acknowledge HA signaling message that new MAG returns when first bidirectional tunnel is set up successfully, a described HA signaling message is used to ask this MAG to transmit the multicast packet of described mobile multicast node by first bidirectional tunnel of setting up.
11. Mobile Access Gateway equipment as claimed in claim 10 is characterized in that, also comprises:
The data forwarding unit is used for transmitting to new MAG by first bidirectional tunnel of setting up the multicast packet of described mobile multicast node.
12. a Mobile Access Gateway equipment is characterized in that, comprising:
Receiving element is used to receive initiate that the mobile multicast node the switched old MAG under current sends first switch and initiate the HI signaling message, and a described HI signaling message is used to ask to set up first bidirectional tunnel between old MAG and this MAG;
Processing unit, be used for setting up described first bidirectional tunnel according to a HI signaling message that receives, and when first bidirectional tunnel is set up successfully, return a HA signaling message to described old MAG, ask old MAG to transmit the multicast packet of described mobile multicast node by first bidirectional tunnel of setting up.
13. Mobile Access Gateway equipment as claimed in claim 12 is characterized in that, also comprises:
The data forwarding unit is used to receive and multicast packet that the old MAG of buffer memory transmits by first bidirectional tunnel of setting up, and in described mobile multicast node after old MAG switches to this MAG, send the multicast packet that old MAG transmits to described mobile multicast node.
14., it is characterized in that as claim 12 or 13 described Mobile Access Gateway equipment, also comprise interface unit, wherein:
The multicast state information that comprises described mobile multicast node in the HI signaling message that described receiving element receives;
Described interface unit, be used in described mobile multicast node after old MAG switches to this MAG, send the agent binding update PBU signaling message of multicast expansion to local mobile anchor LMA, request add multicast group and set up this MAG and LMA between second bidirectional tunnel, and receive the agent binding affirmation PBA signaling message that described LMA returns when second bidirectional tunnel is set up successfully, comprise the multicast state information of the described mobile multicast node of from a described HI signaling message, obtaining in the PBU signaling message of described multicast expansion.
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