CN103096250A - Method and system for mobile multicast quick and smooth switch - Google Patents
Method and system for mobile multicast quick and smooth switch Download PDFInfo
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Abstract
The invention discloses a method and a system for mobile multicast quick and smooth switch. The method and the system for the mobile multicast quick and smooth switch comprise that a mobile access gateway (MAG) administered by a local mobile anchor (LMA) sends multicast state information of multicast receiving end (MN) after multicast monitor discovery report message sent by the MNis received; when the MN is switched to a target MAG from a source MAG, the target MAG knows the multicast state of the MN from the LMA, and then a novel multicast transmitting path is established according to the multicast state of the MN. According to the method and the system for the mobile multicast quick and smooth switch, the problems of switch delay and packet loss because a multicast receiver joins into a multicast group again through interaction of multicast listener discover (MLD) control message between the multicast receiver and the target MAG are solved, multicast receiving speed of the MN in a mobile state is accelerated, and break periods of multicast conversation are effectively reduced.
Description
Technical field
The present invention relates to moving communicating field, relate in particular to a kind of method and system of the mobile multicast fast and smooth handoff in PMIPv6.
Background technology
The appearance of multicast is the efficiency that occurs when processed group is communicated by letter in order to solve the traditional unicast route.Along with wireless and development mobile technology, obtain multicast services and become a study hotspot in moving process, mobile multicast by tradition fixedly multicast develop, for the mobile subscriber provides multiple application such as mobile video session, mobile online game, can effectively improve data transmission efficiency.Mobile multicast need to solve two basic problems: the one, and group membership's relation management, the 2nd, group membership's location management.Current group membership's relation management generally adopts Internet Group Management Protocol (Internet Group Management Protocol, be called for short IGMP)/multicast listener discovery (Multicast Listener Discover, be called for short MLD) etc. agreement, group membership's location management adopts the mobility management protocols such as Mobile IP.Internet engineering duty group (Internet Engineering Task Force, be called for short IETF) has proposed two kinds of multicast mechanisms that mobility support is provided for terminal in MIPv6: bidirectional tunnel (MIP-BT) mechanism and long-range adding (MIP-RS) mechanism.In bidirectional tunnel (MIP-BT) mechanism, set up bidirectional tunnel between mobile multicast node and home agent, be used for bear multicast group message and multicast packet; In long-range adding (MIP-RS) mechanism, when mobile multicast node changes network of living at every turn, again join in multicast group, recomputate multicast tree by multicast protocol.MIPv6 is based on the mobility management protocol of main frame, needs terminal to possess the mobile management function, and this has just increased the difficulty that mobile multicast is disposed and expanded.
based on the problems referred to above, IETF has proposed multiple mobile multicast mechanism based on PMIPv6 in MULTIMOB working group, as shown in Figure 1, MAG1 is the Mobile Access Gateway before MN switches, MAG2 is the Mobile Access Gateway after MN switches, LMA is the local mobile anchor of MN, mainly be divided into two kinds of mechanism: the first mechanism, at local mobile anchor LMA deploy multicast protocol, MN provides multicast services for mobile multicast node, in this mechanism, multicast is controlled message and multicast data message all carries by the PMIPv6 bidirectional tunnel between the Mobile Access Gateway of LMA and MN, in the second mechanism, LMA does not participate in multicast relevant signaling and route, the multicast services of MN is provided by the multicast router MR (Multicast Router) in the PMIPv6 territory, carry out interacting message and transmitting multicast data by multicast protocol between the Mobile Access Gateway of MN and multicast router MR, do not need to carry out tunnel encapsulation.When MN switches to MAG2 from Mobile Access Gateway MAG1, MN by and MAG2 between the MLD control message again join in multicast group alternately, rely on the factors such as radio frames, wireless access contention, passage confidence level, MLD control message processing time of wireless access side due to needs, MAG2 needs the long time just can get the multicast monitoring state of mobile multicast node, causes multicast handoff delay and packet loss.
Multicast signaling process in prior art when MN switches, when providing multicast services by multicast router MR for MN, MN switches to Mobile Access Gateway MAG2 from current Mobile Access Gateway MAG1, and MAG2 sends binding update messages PBU to LMA.After LMA receives PBU message, upgrade corresponding banding cache list item BCE.That carries out between new Mobile Access Gateway MAG2 and MN that MLD controls message obtains the current multicast state of MN alternately.After MAG2 obtains the multicast state of MN, send PIM Join to the multicast source hop-by-hop and join message, set up take multicast source as root the SPT path take mobile multicast node MN as leaf.The multicast packet that multicast source sends is sent to MN via MR, MAG2 successively.In said method, MN by and MAG2 between the MLD control message again join alternately in multicast group, due to the wireless transmission delay that processing time and this process of MLD message causes, cause switching delay and the packet loss of MN.
Multicast signaling process in prior art when MN switches, when providing multicast services by LMA for MN, the multicast packet that before MN switches, multicast source sends is forwarded to MAG1 by the PMIPv6 tunnel between LMA and MAG1 again via LMA and is sent to MN again.MN switches to Mobile Access Gateway MAG2 from current Mobile Access Gateway MAG1, and MAG2 sends binding update messages PBU to LMA.After LMA receives PBU message, upgrade corresponding banding cache list item BCE.That carries out between new Mobile Access Gateway MAG2 and MN that MLD controls message obtains the current multicast state of MN alternately.After MAG2 obtains the multicast state of MN, send PIM Join to the multicast source hop-by-hop and join message, set up take multicast source as root, the SPT path take mobile multicast node MN as leaf, the PIM Join message that wherein mails to LMA needs the process of passing through tunnel encapsulation.The multicast packet that multicast source sends sends to LMA and is forwarded to MAG2 by the PMIPv6 tunnel between LMA and MAG2 again and is forwarded to MN by MAG2 again.In said method, MN by and MAG2 between the MLD control message again join alternately in multicast group, due to the wireless transmission delay that processing time and this process of MLD message causes, cause switching delay and the packet loss of MN.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method and system of mobile multicast fast and smooth handoff, solve multicast receivers in the multicast receivers handoff procedure by and the Suitable For Moving-goal Problems IAD between the MLD control message again join alternately switching delay and the packet loss problem that multicast group causes.
In order to solve the problems of the technologies described above, the invention provides a kind of method of mobile multicast fast and smooth handoff, wherein, after the Mobile Access Gateway (MAG) of local mobile anchor (LMA) administration is received the multicast listener discovery report message of multicast receiving terminal (MN) transmission, send the multicast state information of described MN to described LMA; Described MN switches to Suitable For Moving-goal Problems IAD (MAG) process from source Mobile Access Gateway (MAG), described target MAG is known the multicast state of described MN from local mobile anchor (LMA), set up new multicast forwarding path according to the multicast state of described MN.
Further, said method can also have following characteristics:
After described source MAG receives the multicast listener discovery report message of described MN transmission, send the multicast state information of described MN to described LMA.
Further, said method can also have following characteristics:
When the multicast state of described MN changed, the multicast state of the described MN after described source MAG will upgrade was synchronized to described LMA.
Further, said method can also have following characteristics:
Described MAG with the mode that the multicast state information of described MN is synchronized to described LMA is: send agent binding update messages (PBU) to described LMA, and the multicast state information of carrying described MN in this message.
In order to solve the problems of the technologies described above, the present invention also provides a kind of system of mobile multicast fast and smooth handoff, comprise the source Mobile Access Gateway (MAG) of local mobile anchor (LMA), multicast receiving terminal (MN), described MN, the target MAG of described MN, wherein, described source MAG, after being used for receiving the multicast listener discovery report message of multicast receiving terminal (MN) transmission, send the multicast state information of described MN to described LMA; Described target MAG is used for switching to target MAG process at described MN from source MAG, knows the multicast state of described MN from local mobile anchor (LMA), sets up multicast forwarding path according to the multicast state of described MN.
Further, said system can also have following characteristics:
Described source MAG after also being used for receiving the multicast listener discovery report message of described MN transmission, sends the multicast state information of described MN to described LMA.
Further, said system can also have following characteristics:
Described source MAG also is used for when the multicast state of described MN changes, and the multicast state of the described MN after upgrading is synchronized to described LMA.
Further, said system can also have following characteristics:
Described source MAG also is used in the following ways the multicast state of described MN is synchronized to described LMA: send agent binding update messages (PBU) to described LMA, and the multicast state of carrying described MN in this message.
In order to solve the problems of the technologies described above, the invention provides a kind of multicast state information synchronization method, wherein, when the Mobile Access Gateway (MAG) of local mobile anchor (LMA) administration is received the multicast listener discovery report message that multicast receiving terminal (MN) sends, the multicast state information of described MN is sent to described LMA.
Further, said method can also have following characteristics:
When the multicast state information of described MN changed, the multicast state information of the described MN after described MAG will upgrade was synchronized to described LMA.
Further, said method can also have following characteristics:
Described MAG with the mode that the multicast state information of described MN is synchronized to described LMA is: send agent binding update messages (PBU) to described LMA, and the multicast state information of carrying described MN in this message.
Further, said method can also have following characteristics:
After described LMA receives the binding update messages (PBU) of the multicast state information of carrying described MN from described MAG, the multicast state information of MN described in described binding update messages is saved in the banding cache list item (BCE) of described MN.
In order to solve the problems of the technologies described above, the invention provides a kind of multicast state information synchronization system, wherein, comprise Mobile Access Gateway (MAG), the multicast receiving terminal (MN) of local mobile anchor (LMA), described MN administration; Described MAG when being used for receiving the multicast listener discovery report message that multicast receiving terminal (MN) sends, sends to described LMA with the multicast state information of described MN; Described LMA, when being used for receiving the multicast state information of described MN from described MAG, the multicast state information of preserving described MN.
Further, said system can also have following characteristics:
Described MAG also is used for when the multicast state of described MN changes, and the multicast state information of the described MN after upgrading is synchronized to described LMA.
Further, said system can also have following characteristics:
Described MAG also is used in the following ways the multicast state information of described MN is synchronized to described LMA: send agent binding update messages (PBU) to described LMA, and the multicast state information of carrying described MN in this message.
Further, said system can also have following characteristics:
Described LMA after being used for receiving the binding update messages (PBU) of the multicast state information of carrying described MN from described MAG, is saved in the multicast state information of MN described in described binding update messages in the banding cache list item (BCE) of described MN.
In order to solve the problems of the technologies described above, the invention provides a kind of Mobile Access Gateway, wherein, comprise the multicast state information management module; Described multicast state information management module when being used for receiving the multicast listener discovery report message that multicast receiving terminal (MN) sends, sends to described LMA with the multicast state information of described MN.
Further, above-mentioned Mobile Access Gateway can also have following characteristics:
Described multicast state information management module also is used for when the multicast state of described MN changes, and the multicast state information of the described MN after upgrading is synchronized to described LMA.
Further, above-mentioned Mobile Access Gateway can also have following characteristics:
Described multicast state information management module also is used in the following ways the multicast state information of described MN is synchronized to described LMA: send agent binding update messages (PBU) to described LMA, and the multicast state information of carrying described MN in this message.
In this programme when multicast receivers MN switches in the PMIPv6 territory, by the multicast monitoring state of new Mobile Access Gateway MAG from LMA quick obtaining MN.LMA is as the registration anchor point of all MN, and MAG sends to LMA after receiving the MLD report message of MN, realizes management to multicast member by LMA.Use this programme solved multicast receivers in the multicast receivers handoff procedure by and the Suitable For Moving-goal Problems IAD between the MLD control message again join alternately switching delay and the packet loss problem that multicast group causes, accelerate the multicast inbound pacing of MN under mobile status, effectively reduced the break period of multicast conversation; In handoff procedure, new MAG no longer needs to rely on the factors such as radio frames, wireless access contention, passage confidence level, MLD control message processing time when obtaining the multicast monitoring state information of MN.
Description of drawings
Fig. 1 disposes the frame diagram of IP multicast in PMIPv6 in prior art;
Fig. 2 is the method schematic diagram of mobile multicast fast and smooth handoff in embodiment;
Fig. 3 is the system construction drawing of mobile multicast fast and smooth handoff in embodiment;
Fig. 4 carries out the method schematic diagram of group membership management by LMA;
Fig. 5 is the multicast switching method flow chart of specific embodiment one;
Fig. 6 is the multicast switching method flow chart of specific embodiment two.
Embodiment
As shown in Figure 2, the method of mobile multicast fast and smooth handoff comprises: after the Mobile Access Gateway (MAG) of local mobile anchor (LMA) administration is received the multicast listener discovery report message of multicast receiving terminal (MN) transmission, send the multicast state information of described MN to described LMA; Described MN switches to Suitable For Moving-goal Problems IAD (MAG) process from source Mobile Access Gateway (MAG), described target MAG is known the multicast state of described MN from local mobile anchor (LMA), set up new multicast forwarding path according to the multicast state of described MN.
Wherein, after described source MAG receives the multicast listener discovery report message of described MN transmission, send the multicast state information of described MN to described LMA.
When the multicast state of described MN changed, the multicast state of the described MN after described source MAG will upgrade was synchronized to described LMA.
Described MAG with the mode that the multicast state information of described MN is synchronized to described LMA is: send agent binding update messages (PBU) to described LMA, and the multicast state information of carrying described MN in this message.
As shown in Figure 3, the system of the mobile multicast fast and smooth handoff corresponding with said method comprises the source Mobile Access Gateway (MAG) of local mobile anchor (LMA), multicast receiving terminal (MN), described MN, the target MAG of described MN; Described source MAG after being used for receiving the multicast listener discovery report message of multicast receiving terminal (MN) transmission, sends the multicast state information of described MN to described LMA; Described target MAG is used for switching to target MAG process at described MN from source MAG, knows the multicast state of described MN from local mobile anchor (LMA), sets up multicast forwarding path according to the multicast state of described MN.
Described source MAG after also being used for receiving the multicast listener discovery report message of described MN transmission, sends the multicast state information of described MN to described LMA.
Described source MAG also is used for when the multicast state of described MN changes, and the multicast state of the described MN after upgrading is synchronized to described LMA.
Described source MAG also is used in the following ways the multicast state of described MN is synchronized to described LMA: send agent binding update messages (PBU) to described LMA, and the multicast state of carrying described MN in this message.
Below in conjunction with accompanying drawing, execution mode is described in detail.
This programme is for switching delay and packet loss problem, proposed to use LMA to carry out unified management to the multicast state of mobile node MN, after having guaranteed that MN switches to new Mobile Access Gateway, new Mobile Access Gateway can be from the current multicast state of LMA quick obtaining MN, and then the new multicast forwarding path of Rapid Establishment, reduce multicast handoff delay and packet loss, and the MLD signaling that need not rely on wireless side is collected the current multicast state of MN again.
The method of as shown in Figure 4, carrying out group membership management by LMA in this programme comprises:
Step 400, MN initially is attached to Mobile Access Gateway MAG, and MAG and LMA carry out the binding registration of PMIPv6, and LMA is that MN creates banding cache list item BCE.
Described multicast state comprises some records, the content of every record comprises (multicast address G, the multicast source address list, filtered model), if filtered model is the INCLUDE pattern, the multicast source address list comprises Include List, be that MN receives the multicast packet that in Include List, all multicast sources send, if filtered model is the EXCLUDE pattern, the multicast source address list comprises Exclude List, the multicast packet that the MN refusal sends from all multicast sources in Exclude List.
When the multicast state of described link changes, i.e. newly-increased record, multicast source address list change, when filtered model switches, and MAG sends to LMA by PBU message with new multicast state.
Step 403, LMA extracts the multicast state in PBU message, is saved in corresponding BCE.
In the present embodiment, MAG preserves the Real-time Multicast state to the multicast state of LMA registration MN, by LMA, the multicast state of all MN is carried out unified management, for the multicast switching of MN is prepared.MN carries out MAG when switching, and target MAG directly need not to obtain from MN from the multicast state information that LMA obtains MN.
Specific embodiment one
This specific embodiment one provides multicast services by MR for MN, has safeguarded the multicast monitoring state for each MN in LMA.As shown in Figure 5, the MN multicast switching method comprises the following steps:
The multicast packet that step 500, multicast source are sent is sent to MN via MR and MAG1; Multicast forwarding path does not need through LMA.
Step 501, MN switches to Mobile Access Gateway MAG2 from current Mobile Access Gateway MAG1, and the MAG1 buffer memory mails to the multicast packet of MN.
Step 502, after MN was attached to new Mobile Access Gateway MAG2, MAG2 sent binding update messages (PBU) to LMA.
Step 503 after LMA receives PBU message, is upgraded corresponding banding cache list item BCE, and the multicast state of the MN that preserves in BCE is carried in PBA message, sends to new Mobile Access Gateway MAG2.
Step 504, MAG2 creates multicast state (G according to the multicast state of MN for the interface that links MN, filtered model, the multicast source address list, timer), if there has been the state table of multicast address G on this interface, multicast source address list, filtered model or the timer in the update mode table.
If MAG2 operation multicast routing protocol PIM carries out step 505 and step 506; If MAG2 operation MLD is Proxy, carry out step 507 and step 508.
Step 505, MAG2 creates or renewal Multicast Routing item (S, G), and send PIM Join message to multicast router MR, if MAG2 has been upward that channel (S, G) created the Multicast Routing item before, only need to upgrade timer, do not need to send PIM Join message to MR.
Step 506, multicast router MR creates Multicast Routing item (S, G); And set up multicast distribution tree to multicast source hop-by-hop transmission PIM Join message.
Step 507, MAG2 upgrades group membership's relational database, if group membership's relational database changes, sends Aggregated MLD report message by upstream Interface to multicast router MR.
Step 508, multicast router MR creates multicast state (G, filtered model, multicast source address list, timer) for the downstream interface that receives Aggregated MLD report message; And set up multicast distribution tree to multicast source hop-by-hop transmission PIM Join message.If there has been the state table of multicast address G on this interface, multicast source address list, filtered model or the timer in the update mode table.
Step 509, MAG2 obtains the address of MAG1 by step 502, and sends the multicast packet of message informing MAG1 forwarding cache to MAG1, and this message can define new message by expansion PBU message or between MAG and realize.
Step 510, MAG1 is established to the tunnel of MAG2 according to the address of MAG2, the multicast packet of buffer memory is carried out sending to MAG2 after tunnel encapsulation.
Step 511, MAG2 is to the MN multicast data forwarding.
Step 512, follow-up forwarding path of multicast data.
In the present embodiment, all multicast services is all provided by the multicast router MR in the PMIPv6 territory, join corresponding multicast group by MR, LMA only preserves real-time multicast state for MN, when facilitating MN to switch, new Mobile Access Gateway can pass through the current multicast state of LMA quick obtaining MN, the multicast state that the MLD signaling that does not need to rely on wireless side is collected MN just can continue as MN provides multicast services, has reduced the loss of multicast data message in handover delay and handoff procedure.
Specific embodiment two
This specific embodiment two provides multicast services by LMA for MN, in the LMA deploy multicast protocol, safeguarded the multicast monitoring state for each MN in LMA.As shown in Figure 6, the MN multicast switching method comprises the following steps:
Step 600, the multicast forwarding path before MN switches, the LMA deploy multicast protocol, as shown in step 600b, multicast packet forwards by the tunnel between Mobile Access Gateway MAG1 and LMA.
Step 601～step 604 is identical with the handling process of step 501～step 504, repeats no more herein.
If MAG2 operation multicast routing protocol PIM carries out step 605 and step 606; If MAG2 operation MLD is Proxy, carry out step 607 and step 608.
Step 605, MAG2 creates Multicast Routing item (S, G), and send PIM Join message by the tunnel to LMA, if MAG2 has been upward that channel (S, G) created the Multicast Routing item before, only need to upgrade timer, do not need to send PIM Join message to LMA.
Step 606 after LMA receives PIM Join message, creates Multicast Routing item (S, G), and sets up multicast distribution tree to multicast source hop-by-hop transmission PIM Join message.If be that channel (S, G) created the Multicast Routing item before LMA is upper, only need to upgrade timer, and tunnel interface is added in the outgoing interface list, do not need to send PIM Join message to LMA.
Step 607, MAG2 upgrades group membership's relational database, if group membership's relational database changes, sends Aggregated MLD report message by upstream Interface to LMA.
Step 609, MAG2 obtains the address of MAG1 by step 602, and sends the multicast packet of message informing MAG1 forwarding cache to MAG1, and this message can define new message by expansion PBU message or between MAG and realize.
Step 610, MAG1 is established to the tunnel of MAG2 according to the address of MAG2, the multicast packet of buffer memory is carried out sending to MAG2 after tunnel encapsulation.
Step 611, the backward MN multicast data forwarding of MAG2 decapsulation.
Step 612～step 614, follow-up forwarding path of multicast data as shown in step 613, after LMA receives multicast packet, need to carry out sending to MAG2 after tunnel encapsulation, sends to MN by MAG2 at last.
Multicast services all in the present embodiment are all provided by LMA, join corresponding multicast group by LMA, and multicast packet need to encapsulate transmission by the PMIPv6 tunnel between Mobile Access Gateway and LMA; LMA preserves real-time multicast state for MN simultaneously, when facilitating MN to switch, new Mobile Access Gateway can pass through the current multicast state of LMA quick obtaining MN, the multicast state that the MLD signaling that does not need to rely on wireless side is collected MN just can continue as MN provides multicast services, has reduced the loss of multicast data message in handover delay and handoff procedure.Adopt the method for the invention, when multicast receivers is moved in the PMIPv6 territory, receiving multicast data stream in time.
Above embodiment is for the scene of PMIPv6, and utilization MLD agreement is carried out the IPv6 multicast group member management.Technique scheme is equally applicable to the scene of proxy-mobile IP v4, and those skilled in the art can be according to the technical scheme in the embodiment of the present invention, and can realize in conjunction with state of the art scheme.Mobile node in proxy mobile IPv 6 uses MLD to add multicast group, and the mobile node in proxy-mobile IP v4 uses IGMP to add multicast group.
This programme also provides a kind of multicast state information synchronization method, comprise: when the Mobile Access Gateway (MAG) of local mobile anchor (LMA) administration is received the multicast listener discovery report message that multicast receiving terminal (MN) sends, the multicast state information of described MN is sent to described LMA.
When the multicast state information of described MN changed, the multicast state information of the described MN after described MAG will upgrade was synchronized to described LMA.
Described MAG with the mode that the multicast state information of described MN is synchronized to described LMA is: send agent binding update messages (PBU) to described LMA, and the multicast state information of carrying described MN in this message.
After described LMA receives the binding update messages (PBU) of the multicast state information of carrying described MN from described MAG, the multicast state information of MN described in described binding update messages is saved in the banding cache list item (BCE) of described MN.
The multicast state information synchronization system corresponding with said method comprises Mobile Access Gateway (MAG), multicast receiving terminal (MN) that local mobile anchor (LMA), described MN administer; Described MAG when being used for receiving the multicast listener discovery report message that multicast receiving terminal (MN) sends, sends to described LMA with the multicast state information of described MN; Described LMA, when being used for receiving the multicast state information of described MN from described MAG, the multicast state information of preserving described MN.
Described MAG also is used for when the multicast state of described MN changes, and the multicast state information of the described MN after upgrading is synchronized to described LMA.
Described MAG also is used in the following ways the multicast state information of described MN is synchronized to described LMA: send agent binding update messages (PBU) to described LMA, and the multicast state information of carrying described MN in this message.
Described LMA after being used for receiving the binding update messages (PBU) of the multicast state information of carrying described MN from described MAG, is saved in the multicast state information of MN described in described binding update messages in the banding cache list item (BCE) of described MN.
The Mobile Access Gateway that this programme provides comprises the multicast state information management module; Described multicast state information management module when being used for receiving the multicast listener discovery report message that multicast receiving terminal (MN) sends, sends to described LMA with the multicast state information of described MN.
Described multicast state information management module also is used for when the multicast state of described MN changes, and the multicast state information of the described MN after upgrading is synchronized to described LMA.
Described multicast state information management module also is used in the following ways the multicast state information of described MN is synchronized to described LMA: send agent binding update messages (PBU) to described LMA, and the multicast state information of carrying described MN in this message.
Need to prove, in the situation that do not conflict, the embodiment in the application and the feature in embodiment be combination in any mutually.
Certainly; the present invention also can have other various embodiments; in the situation that do not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
One of ordinary skill in the art will appreciate that all or part of step in said method can come the instruction related hardware to complete by program, described program can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can realize with one or more integrated circuits.Correspondingly, each the module/unit in above-described embodiment can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
Claims (19)
1. the method for a mobile multicast fast and smooth handoff, wherein,
After the Mobile Access Gateway (MAG) of local mobile anchor (LMA) administration is received the multicast listener discovery report message of multicast receiving terminal (MN) transmission, send the multicast state information of described MN to described LMA; Described MN switches to Suitable For Moving-goal Problems IAD (MAG) process from source Mobile Access Gateway (MAG), described target MAG is known the multicast state of described MN from local mobile anchor (LMA), set up new multicast forwarding path according to the multicast state of described MN.
2. the method for claim 1, is characterized in that,
After described source MAG receives the multicast listener discovery report message of described MN transmission, send the multicast state information of described MN to described LMA.
3. the method for claim 1, is characterized in that,
When the multicast state of described MN changed, the multicast state of the described MN after described source MAG will upgrade was synchronized to described LMA.
4. method as claimed in claim 2 or claim 3, is characterized in that,
Described MAG with the mode that the multicast state information of described MN is synchronized to described LMA is: send agent binding update messages (PBU) to described LMA, and the multicast state information of carrying described MN in this message.
5. the system of a mobile multicast fast and smooth handoff, comprise the source Mobile Access Gateway (MAG) of local mobile anchor (LMA), multicast receiving terminal (MN), described MN, the target MAG of described MN, wherein,
Described source MAG after being used for receiving the multicast listener discovery report message of multicast receiving terminal (MN) transmission, sends the multicast state information of described MN to described LMA;
Described target MAG is used for switching to target MAG process at described MN from source MAG, knows the multicast state of described MN from local mobile anchor (LMA), sets up multicast forwarding path according to the multicast state of described MN.
6. system as claimed in claim 5, is characterized in that,
Described source MAG after also being used for receiving the multicast listener discovery report message of described MN transmission, sends the multicast state information of described MN to described LMA.
7. system as claimed in claim 5, is characterized in that,
Described source MAG also is used for when the multicast state of described MN changes, and the multicast state of the described MN after upgrading is synchronized to described LMA.
8. system as described in claim 6 or 7, is characterized in that,
Described source MAG also is used in the following ways the multicast state of described MN is synchronized to described LMA: send agent binding update messages (PBU) to described LMA, and the multicast state of carrying described MN in this message.
9. multicast state information synchronization method, wherein,
When the Mobile Access Gateway (MAG) of local mobile anchor (LMA) administration is received the multicast listener discovery report message that multicast receiving terminal (MN) sends, the multicast state information of described MN is sent to described LMA.
10. the method for stating as claim 9 is characterized in that,
When the multicast state information of described MN changed, the multicast state information of the described MN after described MAG will upgrade was synchronized to described LMA.
11. method as described in claim 9 or 10 is characterized in that,
Described MAG with the mode that the multicast state information of described MN is synchronized to described LMA is: send agent binding update messages (PBU) to described LMA, and the multicast state information of carrying described MN in this message.
12. method as claimed in claim 11 is characterized in that,
After described LMA receives the binding update messages (PBU) of the multicast state information of carrying described MN from described MAG, the multicast state information of MN described in described binding update messages is saved in the banding cache list item (BCE) of described MN.
13. a multicast state information synchronization system wherein, comprises Mobile Access Gateway (MAG), the multicast receiving terminal (MN) of local mobile anchor (LMA), described MN administration;
Described MAG when being used for receiving the multicast listener discovery report message that multicast receiving terminal (MN) sends, sends to described LMA with the multicast state information of described MN;
Described LMA, when being used for receiving the multicast state information of described MN from described MAG, the multicast state information of preserving described MN.
14. system as claimed in claim 13 is characterized in that,
Described MAG also is used for when the multicast state of described MN changes, and the multicast state information of the described MN after upgrading is synchronized to described LMA.
15. system as described in claim 13 or 14 is characterized in that,
Described MAG also is used in the following ways the multicast state information of described MN is synchronized to described LMA: send agent binding update messages (PBU) to described LMA, and the multicast state information of carrying described MN in this message.
16. system as claimed in claim 15 is characterized in that,
Described LMA after being used for receiving the binding update messages (PBU) of the multicast state information of carrying described MN from described MAG, is saved in the multicast state information of MN described in described binding update messages in the banding cache list item (BCE) of described MN.
17. a Mobile Access Gateway wherein, comprises the multicast state information management module;
Described multicast state information management module when being used for receiving the multicast listener discovery report message that multicast receiving terminal (MN) sends, sends to described LMA with the multicast state information of described MN.
18. Mobile Access Gateway as claimed in claim 17 is characterized in that,
Described multicast state information management module also is used for when the multicast state of described MN changes, and the multicast state information of the described MN after upgrading is synchronized to described LMA.
19. Mobile Access Gateway as described in claim 17 or 18 is characterized in that,
Described multicast state information management module also is used in the following ways the multicast state information of described MN is synchronized to described LMA: send agent binding update messages (PBU) to described LMA, and the multicast state information of carrying described MN in this message.
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