CN101924997A - Method and equipment for controlling multicast service in WLAN (Wireless Local Area Network) - Google Patents
Method and equipment for controlling multicast service in WLAN (Wireless Local Area Network) Download PDFInfo
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- CN101924997A CN101924997A CN200910053069XA CN200910053069A CN101924997A CN 101924997 A CN101924997 A CN 101924997A CN 200910053069X A CN200910053069X A CN 200910053069XA CN 200910053069 A CN200910053069 A CN 200910053069A CN 101924997 A CN101924997 A CN 101924997A
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Abstract
The invention discloses a method for controlling a multicast service in a WLAN (Wireless Local Area Network) by a wireless local area network (WLAN) multicast proxy, comprising the following steps of: when the WLAN multicast proxy receives a first multicast service register message from a user terminal, responding to the first multicast service register message for configuring a multicast forwarding table of the WLAN multicast proxy; and when the WLAN multicast proxy receives an AP (Assembly Point) switching message generated by an AC (Access Controller) in a DSLAM (Digital Subscriber Line Access Multiplexer), responding to the AP switching message for configuring a multicast forwarding table of the WLAN multicast proxy. In the invention, the WLAN multicast proxy can conceal the complexity of a WLAN network infrastructure to the user terminal and the traditional multicast transmitting module in fixed access equipment for transmitting the multicast service. In addition, the WLAN multicast proxy is conductive to realize the quick service switching when a WiFi (Wireless Fidelity) terminal moves from one AP in the same WLAN ESS (Wireless Local Area Network Executive Support System) to the other AP.
Description
Technical field
The present invention relates to the communications field, relate more specifically to a kind of method that is used for controlling the multicast service of WLAN.Utilize the present invention, the complexity of wlan network architecture can be hidden to user terminal and the existing multicast functional module that is used in the fixedly access device that multicast service transmits, the quick switching of multicast service between different AP can also be in WLAN, realized simultaneously.
Background technology
In recent years, worldwide widespread deployment WLAN (wireless local area network) (Wireless LocalArea Network, WLAN).The deployment framework that has some kinds of wlan networks.For managing large scale WLAN better, begin to adopt centralized WLAN framework gradually.
For the digital subscriber line of wanting to dispose extensive wlan network and realize the roaming of nationwide (Digital Subscriber Line, DSL) Virtual network operator, China Telecom for example, they extensively adopt the return link of DSL as WLAN.Access point (Access Point, AP) be connected to the DSL Access Network via the DSL modulator-demodulator, and at Network Access Provider (Network Access Provider, NAP) disposed Wireless Fidelity (WirelessFidelity in the network, WiFi) access controller (Access Controller, AC), so that the controlled function at AP to be provided.In order to realize better extensibility, as shown in Figure 1, AC can (Digital Subscriber Line Access Multiplexer DSLAM) realizes in the equipment at digital subscriber line access multiplex.
For public WiFi hot spot region, can utilize centralized architecture to dispose two kinds of AP, promptly have remote media access control (Media Access Control, MAC) the Thin AP of pattern (thin AP) and have the Fit AP of local MAC mode.Here Fit AP is can be by the Lightweight AP of WLANAC concentrated controling management, and for the Fit AP of local MAC mode, whole or most of 802.11 MAC function collection are realized at the AP place.And for the AP of remote mac pattern, whole 802.11 MAC function collection realize that at the AC place AP only is used to stop 802.22 PHY functions.For the WLAN operator of China Telecom and so on, need in WLAN, serve switching.When the WiFi terminal when the overlay area of an AP moves to another AP, quick extended service set (Extended ServiceSet, ESS) transfer process of this terminal from old AP to new AP appears.By means of 802.11r, can realize that the service of ongoing unicast services on the terminal is switched.Yet for the ongoing multicast service on the terminal, 802.11r or other existing solutions all can't realize the service switching.For example, the user is just watching on the WiFi terminal based on the advertisement video of multicast or Internet Protocol Television (IPTV) program, when terminal when an AP switches to another AP, video will stop, the user need resend IGMP (Internet Group Management Protocol to network side then, IGMP) report message is to join the multicast group of this video again.This will cause the user in moving process, and the video frequency program of watching can the regular interruption owing to the switching between AP.At present, there is not existing solution to address the above problem.
On the other hand, currently in DSL and aggregation networks, design and disposed multicast mechanism well, and in DSLAM, realized the relevant function of multicast such as IGMP Proxy or IGMP Snooping.As the return link of WLAN, the different WLANAP that wlan network adopts have different qualities, and the mobility of WLAN support terminal.For example, the Thin AP with remote mac pattern is as wireless antenna, and it only is responsible for 802.11 PHY terminals.But the Fit AP with local MAC mode supports local service to switch, and multicast service can be forwarded to the user terminal that adds this multicast group.In addition, Fit AP also is responsible for the business of user terminal is encrypted.Thereby the complexity during the WLAN multicast service is handled will be brought into DSLAM.
Summary of the invention
In order to realize the switching of the multicast service among the WLAN, conceal the dissimilar of WiFi AP to user terminal simultaneously, and the complexity of the existing multicast module concealment WLAN multicast service processing in DSLAM, the present invention has advised a kind of technical scheme that is used to solve at the multicast service transmission problem of the wlan network that returns via the DSL network.Specifically, the invention provides a kind of WLAN multicast proxy, AC one biconditional operation among itself and the WLAN is used for handling the multicast control and the professional forwarding problems of wlan network.
In one aspect of the invention, a kind of method by the multicast service among the WLAN (wireless local area network) WLAN multicast proxy control WLAN is provided, comprise step: when the WLAN multicast proxy receives the first multicast service registration message from user terminal, multicast forwarding in response to described first multicast service registration message configuration WLAN multicast proxy, wherein, the described first multicast service registration message indicating user terminal requires to add or leave the multicast group at multicast service place, and described multicast forwarding storage is licensed for access to all user terminals of described multicast group and the mapping relations clauses and subclauses of access point AP separately.
Preferably, the method of passing through the multicast service among the WLAN (wireless local area network) WLAN multicast proxy control WLAN according to the embodiment of the invention also comprises step: when the WLAN multicast proxy receives the AP switching message of DSLAM generation, switch the multicast forwarding of message arrangement WLAN multicast proxy in response to described AP, and produce the second multicast service registration message and the 3rd multicast service registration message, wherein, described AP switches the message indicating user terminal and switches to the 2nd AP from an AP, described second multicast service registration message indication is left described multicast group via the user terminal that an AP visits described multicast group, and described the 3rd multicast service registration message indicating user terminal adds described multicast group via the 2nd AP.
In another aspect of this invention, a kind of method by the multicast service among the WLAN (wireless local area network) WLAN multicast proxy control WLAN is provided, comprise step: when the WLAN multicast proxy receives the first multicast service registration message from user terminal, the multicast forwarding of indicating the first access point AP to dispose an AP in response to the described first multicast service registration message, wherein, the described first multicast service registration message indicating user terminal requires to add or leave the multicast group at multicast service place, and licensed all user terminals of visiting described multicast group via an AP of the multicast forwarding of AP storage.
Preferably, the method of passing through the multicast service among the WLAN (wireless local area network) WLAN multicast proxy control WLAN according to the embodiment of the invention also comprises step: when the WLAN multicast proxy receives AP that indicating user terminal that DSLAM produces switches to the 2nd AP from an AP when switching message, switch the multicast forwarding of message arrangement the one AP and the multicast forwarding of the 2nd AP in response to described AP, and produce the second multicast service registration message and the 3rd multicast service registration message, wherein, licensed all user terminals of visiting the multicast group at multicast service place via the 2nd AP of multicast forwarding storage of the 2nd AP, described second multicast service registration message indication is left described multicast group via the user terminal that an AP visits described multicast group, and described the 3rd multicast service registration message indicating user terminal adds described multicast group via the 2nd AP.
In still another aspect of the invention, a kind of WLAN multicast proxy that is used for controlling the multicast service of WLAN (wireless local area network) WLAN is provided, comprise: first receiving device is used to receive the multicast group that requires to add or leave the multicast service place from the wherein said multicast service registration message of the multicast service registration message indicating user terminal of user terminal; And the first multicast forwarding inking device, be used for multicast forwarding in response to described first multicast service registration message configuration WLAN multicast proxy.
Preferably, the WLAN multicast proxy of multicast service that is used for controlling WLAN (wireless local area network) WLAN according to the embodiment of the invention also comprises: second receiving system, be used to receive the access point AP switching message that DSLAM produces, described AP switches the message indicating user terminal and switches to the 2nd AP from an AP; And the second multicast forwarding inking device, be used for switching the multicast forwarding of message arrangement WLAN multicast proxy in response to described AP.
In still another aspect of the invention, a kind of WLAN multicast proxy that is used for controlling the multicast service of WLAN (wireless local area network) WLAN is provided, comprise: first receiving device, be used to receive the multicast service registration message from user terminal, wherein said multicast service registration message indicating user terminal requires to add or leave described multicast group; And the first multicast forwarding inking device, be used for indicating an AP to dispose the multicast forwarding of an AP in response to the described first multicast service registration message.
Preferably, the WLAN multicast proxy of multicast service that is used for controlling WLAN (wireless local area network) WLAN according to the embodiment of the invention also comprises: second receiving system, be used to receive the AP switching message that DSLAM produces, described AP switches the message indicating user terminal and switches to the 2nd AP from an AP; And the second multicast forwarding inking device, be applicable to: switch message in response to described AP and indicate an AP and the 2nd AP to dispose separately multicast forwarding respectively.
Utilize the present invention, can realize the quick switching of multicast service between the different AP of WLAN, make the user in moving process, watch video frequency program constantly, eliminated the problem that video frequency program often interrupts owing to the switching between AP.In addition, the present invention can also be concealed the dissimilar of WiFi AP to user terminal, and the complexity of the existing multicast module concealment WLAN multicast service processing in DSLAM.
Description of drawings
In conjunction with the accompanying drawings, according to following detailed description to non-limiting example of the present invention, above-mentioned and other purpose of the present invention, feature and advantage will become clearer, in the accompanying drawing:
Fig. 1 shows and in the prior art DSL is expanded to the network of relation infrastructure Organization Chart of supporting public WiFi hot spot region;
Fig. 2 shows the flow chart that passes through to control at the WLAN multicast proxy of Thin AP the method for the multicast service among the WLAN according to first embodiment of the invention;
Fig. 3 shows the structural representation at the WLAN multicast proxy of Thin AP of multicast service that is used for controlling WLAN according to first embodiment of the invention;
Fig. 4 shows passing through at the multicast control among the WLAN multicast proxy control WLAN of Thin AP and the signaling process figure of multicast service forwarding according to first embodiment of the invention;
Fig. 5 shows passing through at the multicast control among the WLAN multicast proxy control WLAN of Thin AP and the signaling process figure of multicast service forwarding according to first embodiment of the invention;
Fig. 6 shows the signaling process figure that passes through to carry out at the WLAN multicast proxy of Thin AP the quick ESS switching of multicast service according to first embodiment of the invention; And
Fig. 7 shows the flow chart that passes through to control at the WLAN multicast proxy of Fit AP the method for the multicast service among the WLAN according to second embodiment of the invention;
Fig. 8 shows the structural representation at the WLAN multicast proxy of Fit AP of multicast service that is used for controlling WLAN according to second embodiment of the invention;
Fig. 9 shows passing through at the multicast control among the WLAN multicast proxy control WLAN of Fit AP and the signaling process figure of multicast service forwarding according to second embodiment of the invention;
Figure 10 shows passing through at the multicast control among the WLAN multicast proxy control WLAN of Fit AP and the signaling process figure of multicast service forwarding according to second embodiment of the invention; And
Figure 11 shows the signaling process figure that passes through to carry out at the WLAN multicast proxy of Fit AP the quick ESS switching of multicast service according to second embodiment of the invention.
Embodiment
Below, describe embodiments of the invention in conjunction with the accompanying drawings in detail.In the following description, some specific embodiments only are used to describe purpose, and should not be construed the present invention are had any restriction, and are example of the present invention.
Function according to WLAN multicast proxy of the present invention comprises following two large divisions:
(1) processing is transmitted at the multicast control and the multicast service of WLAN user terminal;
(2) help that (Extended Service Set ESS) carries out quick multicast service and switches on Nei the AP at same WLAN extended service set.
Owing to can dispose Thin AP with remote mac pattern and Fit AP in the public WiFi hot spot region with local MAC mode, and difference is bigger between Fit AP and the Thin AP, and also with difference, below will be respectively the function of WLAN multicast proxy be described in detail at Thin AP and Fit AP at the processing of the WLAN multicast proxy of dissimilar AP.
(first embodiment)
2-6 describes the first embodiment of the present invention below with reference to accompanying drawing.In the first embodiment of the present invention, the WLAN multicast proxy is handled at the multicast control of the user terminal (present embodiment is the WiFi terminal) of the overlay area that is arranged in Thin AP, multicast service and is transmitted and multicast service switching fast.
Fig. 2 shows the flow chart of method of multicast service of WiFi terminal that passes through to be positioned among the WLAN multicast proxy control WLAN Thin AP overlay area according to first embodiment of the invention.As shown in Figure 2, this method begins at step S201.At step S202, the WLAN multicast proxy receives and requires to add the multicast service registration message (for example, IGMP report message) of described multicast group from user terminal about user terminal.In this case, flow process forwards step S203 to, checks the access right of user terminal for described multicast group.If user terminal is not licensed for access to described multicast group, then abandon this multicast service registration message (step S204).If user terminal is licensed for access to described multicast group, then the mapping relations clauses and subclauses with user terminal and its AP are added into (step S205) in the multicast forwarding, and the IGMP report message are sent to the multicast functional module (step S206) of DSLAM.In this case, flow process changes step S216 over to, and flow process finishes at step S216.
At step S207, the WLAN multicast proxy receives and requires to leave the multicast service registration message (for example, igmp leave message) of described multicast group from user terminal about user terminal.In this case, flow process changes step S208 over to, the WLAN multicast proxy removes the mapping relations clauses and subclauses of this user terminal and its AP from multicast forwarding, determine whether to exist in the multicast forwarding other user terminals of requiring this multicast service and its mapping relations clauses and subclauses (S209) of AP separately then.If also have other user terminals require this multicast service and its mapping relations clauses and subclauses of AP separately in the multicast forwarding, then abandon this igmp leave message (step S210).If do not require the user terminal of this multicast service and its separately during the mapping relations clauses and subclauses of AP in the multicast forwarding, then igmp leave message is transmitted to the multicast functional module (step S206) of DSLAM, method finishes at step S216 then.
At step S211, the AP that AC produced that the WLAN multicast proxy receives among the DSLAM switches message.At step S212, switch the mapping relations clauses and subclauses of message in response to described AP, and produce multicast service registration message (being igmp leave message in the present embodiment) (step 213) from a multicast forwarding deletion user terminal and an AP.In this case, flow process forwards foregoing step S209 to.At step S214, the WLAN multicast proxy is added into multicast forwarding with the mapping relations clauses and subclauses of user terminal and the 2nd AP, and produces multicast service registration message (being the IGMP report message in the present embodiment) (step S215).In this case, flow process forwards step S206 to, and promptly the WLAN multicast proxy sends to the multicast functional module of DSLAM with the IGMP report message, and method finishes at step S216 then.
Here, the IGMP message between the multicast functional module of DSLAM interception user and the router is set up multicast table, and judges whether the message to network side notice IGMP.The first line of a couplet port of DSLAM equipment is carried out the role of main frame, and second line of a couplet port is carried out the role of router.
(1) first line of a couplet port is carried out the role of main frame, and response is from the inquiry of router, when Add User group or certain are organized last user and is withdrawed from, initiatively sends the member and reports and wrap or leave bag, is IGMP report message or igmp leave message in the present embodiment.
(2) business packet of down direction is transmitted according to multicast table.
(3) second line of a couplet port is carried out the role of router, carries out according to the mechanism of stipulating among the IGMP V2 fully, comprises querier election mechanism, regularly sends general polling information, receives to send ad hoc inquiry etc. when leaving bag.
Fig. 3 shows the structural representation at the WLAN multicast proxy of Thin AP of multicast service that is used for controlling WLAN according to first embodiment of the invention.
As shown in Figure 3, WLAN multicast proxy 30 comprises receiving system 301, first inking device 302 and second inking device 303.Receiving system 301 is used to receive from the multicast service registration message of user terminal and the access point AP switching message of DSLAM generation, wherein said multicast service registration message indicating user terminal requires to add or leave the multicast group at multicast service place, and described AP switching message indicating user terminal switches to the 2nd AP from an AP.First inking device 302 is used for the multicast forwarding in response to described first multicast service registration message configuration WLAN multicast proxy.Second inking device 303 is used for switching in response to described AP the multicast forwarding of message arrangement WLAN multicast proxy.
Referring now to Fig. 4 and Fig. 5, Fig. 4 and Fig. 5 show passing through at the multicast control among the WLAN multicast proxy control WLAN of Thin AP and the signaling process figure of multicast service forwarding according to first embodiment of the invention, wherein Fig. 4 shows the process that user terminal requests adds the multicast group, and Fig. 5 shows the process that user terminal requests is left the multicast group.Wherein, the WLAN multicast proxy comprises and is used to store all user terminals of being licensed for access to a certain multicast service and its mapping relations clauses and subclauses of AP separately.
As shown in Figure 4,
401: when user terminal was wanted to add the multicast group MC@1 at multicast service place, user terminal sent the IGMP report message via its WiFi interface, to add multicast group MC@1, can encrypt the IGMP report message;
402:Thin AP is directly with the AC of forwards to the DSLAM;
AC among the 403:DSLAM is decrypted this message, and the IGMP report message is forwarded to the WLAN multicast proxy;
The 404:WLAN multicast proxy is checked the access right of user terminal for desired multicast group MC@1,
405: if user terminal is licensed, then the WLAN multicast proxy adds this user terminal in its multicast forwarding to,
406: the multicast functional module (for example, IGMP Proxy) that then the IGMP report message is forwarded to DSLAM.DSLAM multicast module will be carried out the related procedure processing in accordance with related protocols such as IGMP Proxy, to determine whether adding described multicast group to the network side informing user terminal.
407:, then will abandon this report message, and further not handle if user terminal is not licensed.
When the MC@1 business is sent to DSLAM, the WLAN multicast proxy will be checked its multicast forwarding, to check the user terminal that has added this multicast group, then this business is encrypted, and this business is sent to user terminal (not shown this flow process) via Thin AP.
As shown in Figure 5:
501: when user terminal wants to withdraw from multicast group MC@1, send igmp leave message, leave MC@1, can encrypt to igmp leave message with request via the WiFi interface;
502:Thin AP is directly with the AC of this forwards to the DSLAM;
AC among the 503:DSLAM is decrypted this business, and igmp leave message is forwarded to the WLAN multicast proxy;
The 504:WLAN multicast proxy removes user terminal from its multicast forwarding,
505: if in the multicast forwarding not at the user terminal of MC@1, then the multicast functional module (for example, IGMP Proxy) to DSLAM sends igmp leave message.
506:, then abandon this igmp leave message if require the user terminal of MC@1 in the multicast forwarding in addition.
When the WiFi terminal moves to AP2 in the same WLAN ESS from the overlay area of AP1, will trigger quick ESS transfer process, thereby realize the quick transfer of user terminal.This quick transfer process is carried out by the AC among the DSLAM.In order to realize that on the WiFi terminal fastext of multicast service is switched, AC among the DSLAM is carrying out quick transfer process or is detecting after terminal leaves, to send user terminal to the WLAN multicast proxy and leave/add message, for example { user terminal ID, AP ID, operation (leave or add) } is called this message AP below and switches message.
Referring now to Fig. 6, Fig. 6 shows the signaling process figure that passes through to carry out at the WLAN multicast proxy of Thin AP the quick ESS switching of multicast service according to first embodiment of the invention.
As shown in Figure 6, the quick ESS transfer process of the multicast service of realizing by the WLAN multicast proxy is as follows:
601: access controller produces AP and switches message;
602: access controller switches message with AP and sends to the WLAN multicast proxy;
The 603:WLAN multicast proxy removes the mapping relations clauses and subclauses of a user terminal and an AP from its multicast forwarding;
The 604:WLAN multicast proxy produces igmp leave message;
The 605:WLAN multicast proxy sends to the multicast functional module of DSLAM, for example IGMP Proxy with igmp leave message;
The 606:WLAN multicast proxy is added into its multicast forwarding with the mapping relations clauses and subclauses of user terminal and the 2nd AP;
The 607:WLAN multicast proxy produces the IGMP report message;
The 608:WLAN multicast proxy sends to the IGMP report message multicast functional module of DSLAM.
(second embodiment)
7-11 describes the second embodiment of the present invention below with reference to accompanying drawing.In the second embodiment of the present invention, the WLAN multicast proxy is handled multicast control, the multicast service of the user terminal (being the WiFi terminal in the present embodiment) at the overlay area that is arranged in Fit AP and is transmitted and multicast service switching fast.
Fig. 7 shows the flow chart of method of multicast service of WiFi terminal that passes through to be positioned among the WLAN multicast proxy control WLAN Fit AP overlay area according to second embodiment of the invention.As shown in Figure 7, this method begins at step S701.At step S702, the WLAN multicast proxy receives and requires to add the multicast service registration message (for example, IGMP report message) of described multicast group from user terminal about user terminal.In this case, flow process forwards step S703 to, checks the access right of user terminal for described multicast group.If user terminal is not licensed for access to described multicast group, then abandon this multicast service registration message (step S704).If user terminal is licensed for access to described multicast group, then indicates an AP user terminal to be added in the multicast forwarding of an AP (step S705), and the IGMP report message is sent to the multicast functional module (step S706) of DSLAM.In this case, flow process changes step S714 over to, and flow process finishes at step S714.
At step S707, the WLAN multicast proxy receives and requires to leave the multicast service registration message (for example, igmp leave message) of described multicast group from user terminal about user terminal.In this case, flow process changes step S708 over to, the WLAN multicast proxy indicates an AP that user terminal is removed from the multicast forwarding of an AP, and igmp leave message is transmitted to the multicast functional module (step S706) of DSLAM, and method finishes at step S714 then.
At step S709, the AP that AC produced that the WLAN multicast proxy receives among the DSLAM switches message.At step S710, the WLAN multicast proxy switches message in response to described AP indicates an AP to remove user terminal from its multicast forwarding, produces multicast service registration message (being igmp leave message in the present embodiment) (step 711) simultaneously.In this case, flow process forwards foregoing step S706 to.At step S712, the WLAN multicast proxy indicates the 2nd AP that user terminal is added into the multicast forwarding of the 2nd AP, and produces multicast service registration message (being the IGMP report message in the present embodiment) (step S713).In this case, flow process forwards step S206 to, and promptly the WLAN multicast proxy sends to the multicast functional module of DSLAM with the IGMP report message, and method finishes at step S216 then.
Fig. 8 shows the structural representation at the WLAN multicast proxy of Fit AP of multicast service that is used for controlling WLAN according to second embodiment of the invention.
As shown in Figure 8, WLAN multicast proxy 80 comprises receiving system 801, first inking device 802 and second inking device 803.Receiving system 801 is used for receiving the access point AP that AC the produced switching message from the multicast service registration message and the DSLAM of user terminal, wherein said multicast service registration message indicating user terminal requires to add or leave the multicast group at multicast service place, and described AP switching message indicating user terminal switches to the 2nd AP from an AP.First inking device 802 is used for indicating an AP to dispose the multicast forwarding of an AP in response to the described first multicast service registration message.Second inking device 803 is used for switching message in response to described AP and indicates an AP and the 2nd AP to dispose separately multicast forwarding respectively.
Referring now to Fig. 9 and Figure 10, this two width of cloth figure all show according to second embodiment of the invention pass through control the signaling process figure that multicast control among the WLAN and multicast service are transmitted at the WLAN multicast proxy of the Fit AP with local MAC mode, wherein Fig. 9 shows the process that user terminal requests adds the multicast group, and Figure 10 shows the process that user terminal requests is left the multicast group.Wherein, AP comprises and is used to store licensed all user terminals of visiting a certain multicast service via this AP.
As shown in Figure 9:
901: when user terminal was wanted to add the multicast group MC@1 at multicast service place, user terminal sent the IGMP report message via its WiFi interface, to add MC@1, can encrypt the IGMP report message;
902:Fit AP is decrypted the IGMP report message, and via the control of the WAP (wireless access point) in the middle of AP and the AC and configuration (Control And Provisioning of Wireless Access Points, CAPWAP) tunnel is forwarded to AC among the DSLAM with the IGMP report message;
903:AC is forwarded to the WLAN multicast proxy with this IGMP report message;
The 904:WLAN multicast proxy is checked the access right of user terminal for desired multicast group MC@1,
905:, then abandon this IGMP report message if user terminal is not licensed;
906: if user terminal is licensed, then the WLAN multicast proxy is forwarded to the multicast functional module (for example, IGMP Proxy) of DSLAM with the IGMP report message,
907:WLAN multicast proxy notice AC produces WLAN multicast configuration information, and this multicast configuration information indication is added among the AP multicast forwarding at MC@1 with user terminal,
908:AC produces WLAN multicast configuration messages;
909:AC is sent to AP via CAPWAP tunnel with WLAN multicast configuration messages;
910:AP disposes the multicast forwarding of himself according to WLAN multicast configuration information.
When the MC@1 business was sent to DSLAM, the WLAN multicast proxy was forwarded to the DSL port that is connected with Fit AP with multicast service, and Fit AP is forwarded to user terminal (not shown this process) according to the multicast forwarding that AC disposed with this business then.
As shown in figure 10:
1001: when user terminal wants to withdraw from multicast group MC@1, send igmp leave message, leave MC@1, can encrypt to igmp leave message with request via its WiFi interface;
1002:Fit AP is decrypted this message, via the CAPWAP tunnel between AP and the AC igmp leave message is sent to AC among the DSLAM then;
1003:AC with this forwards to the WLAN multicast proxy;
1004:WLAN multicast proxy notice AC produces WLAN multicast configuration messages, and this multicast configuration information indication removes user terminal from the multicast forwarding at MC@1 of AP;
1005:AC produces WLAN multicast configuration messages;
1006:AC is sent to AP via CAPWAP tunnel with this message;
1007:AP removes the clauses and subclauses relevant with user terminal from its multicast forwarding;
The 1008:WLAN multicast proxy is sent to igmp leave message the multicast module of DSLAM.
Referring now to Figure 11, Figure 11 shows the signaling process figure that passes through to carry out at the WLAN multicast proxy of FitAP quick multicast service switching according to second embodiment of the invention.
When the WiFi terminal moves to AP2 in the same WLAN ESS from the overlay area of AP1, will trigger quick ESS transfer process, to realize the quick transfer of terminal.AC carries out this quick transfer process.In order to realize that on the WiFi terminal fastext of multicast service is switched, AC among the DSLAM is carrying out quick transfer process or is detecting after terminal leaves, to send user terminal to the WLAN multicast proxy and leave/add message, for example { user terminal ID, AP ID, operation (leave or add) } is called this message AP below and switches message.
As shown in figure 11, the quick ESS transfer process of the multicast service of realizing by the WLAN multicast proxy is as follows:
1101: access controller produces AP and switches message;
1102: access controller switches message with AP and sends to the WLAN multicast proxy;
1103:WLAN multicast proxy indication AC sends multicast user terminal to an AP and removes message;
1104:AC indicates an AP to remove user terminal;
AP removed user terminal from its multicast forwarding in 1105: the one;
The 1106:WLAN multicast proxy produces igmp leave message;
The 1107:WLAN multicast proxy sends to igmp leave message the multicast functional module of DSLAM;
1108:WLAN multicast proxy notice AC sends user terminal to the 2nd AP and adds message;
1109:AC indicates the 2nd AP that user terminal is added into its multicast forwarding;
AP was added into its multicast forwarding with user terminal in 1110: the two;
The 1111:WLAN multicast proxy produces the IGMP report message at this user terminal;
The 1112:WLAN multicast proxy sends to the IGMP report message multicast functional module of DSLAM.
As mentioned above, WLAN multicast proxy of the present invention can and existingly be used for the complexity that multicast functional module that multicast service transmits has been hidden the wlan network architecture to the terminal use.In addition, the WLAN multicast proxy also helps to realize the quick service switching of multicast service when the AP of WiFi terminal in same WLAN ESS moves to another AP.
More than describe and only provided the preferred embodiments of the present invention, and be not to limit the present invention by any way.Therefore, any modification of carrying out in the present invention's spirit and principle, replacement, improvement etc. should be contained by the scope of the invention.
Claims (24)
1. one kind is passed through the method that WLAN (wireless local area network) WLAN multicast proxy is controlled the multicast service among the WLAN, comprises step:
When the WLAN multicast proxy receives the first multicast service registration message from user terminal, in response to the multicast forwarding of described first multicast service registration message configuration WLAN multicast proxy,
Wherein, the described first multicast service registration message indicating user terminal requires to add or leave the multicast group at multicast service place, and described multicast forwarding storage is licensed for access to all user terminals of described multicast group and the mapping relations clauses and subclauses of access point AP separately.
2. method according to claim 1, wherein, when the described first multicast service registration message indicating user terminal requires to add described multicast group, specifically comprise in response to the step of the multicast forwarding of described first multicast service registration message configuration WLAN multicast proxy:
Check the access right of user terminal for described multicast group;
When user terminal is licensed for access to described multicast group, the mapping relations clauses and subclauses of user terminal and its AP are added in the multicast forwarding.
3. method according to claim 2 after the mapping relations clauses and subclauses with user terminal and its AP are added into multicast forwarding, also comprises:
The first multicast service registration message is transmitted to the multicast functional module of couple in multiplexer DSLAM, and the multicast functional module of DSLAM is arranged to and determines whether to add described multicast group to the network side informing user terminal.
4. method according to claim 1, wherein, when the described first multicast service registration message indicating user terminal requires to leave described multicast group, specifically comprise in response to the step of the multicast forwarding of described first multicast service registration message configuration WLAN multicast proxy:
The mapping relations clauses and subclauses of this user terminal and its AP are removed from multicast forwarding.
5. method according to claim 4 after the mapping relations clauses and subclauses with this user terminal and its AP remove, also comprises step from multicast forwarding:
Determine whether to exist in the multicast forwarding other user terminals of requiring this multicast service and its mapping relations clauses and subclauses of AP separately, and
In multicast forwarding, do not require the user terminal of this multicast service and its separately during the mapping relations clauses and subclauses of AP, the first multicast service registration message is transmitted to the multicast functional module of DSLAM, and wherein the multicast functional module of DSLAM is arranged to and determines whether to leave described multicast group to the network side informing user terminal.
6. method according to claim 1 also comprises step:
When the WLAN multicast proxy receives the AP switching message of DSLAM generation, in response to the multicast forwarding of described AP switching message arrangement WLAN multicast proxy, and
Produce the second multicast service registration message and the 3rd multicast service registration message,
Wherein, described AP switches the message indicating user terminal and switches to the 2nd AP from an AP, described second multicast service registration message indication is left described multicast group via the user terminal that an AP visits described multicast group, and described the 3rd multicast service registration message indicating user terminal adds described multicast group via the 2nd AP.
7. method according to claim 6 is characterized in that, the step of switching the multicast forwarding of message arrangement WLAN multicast proxy in response to described AP specifically comprises:
Mapping relations clauses and subclauses from a multicast forwarding deletion user terminal and an AP; And
The mapping relations clauses and subclauses of user terminal and the 2nd AP are added into multicast forwarding.
8. method according to claim 7 after the mapping relations clauses and subclauses of a multicast forwarding deletion user terminal and an AP, also comprises:
Determine whether to exist in the multicast forwarding other user terminals of requiring this multicast service and its mapping relations clauses and subclauses of AP separately, and
In multicast forwarding, do not require the user terminal of this multicast service and its separately during the mapping relations clauses and subclauses of AP, the second multicast service registration message is transmitted to the multicast functional module of DSLAM, and the multicast functional module of wherein said DSLAM is arranged to and determines whether to leave described multicast group to the network side notice via the user terminal that an AP visits described multicast group.
9. method according to claim 7 after the mapping relations clauses and subclauses with user terminal and the 2nd AP are added into multicast forwarding, also comprises:
The 3rd multicast service registration message is transmitted to the multicast functional module of DSLAM, and the multicast functional module of described DSLAM is arranged to and determines whether to add described multicast group to the network side informing user terminal via the 2nd AP.
10. method according to claim 1 also comprises:
When couple in multiplexer DSLAM receives multicast service, check multicast forwarding, with definite mapping relations clauses and subclauses that added user terminal and its AP of described multicast group; And
AP separately via the user terminal that adds described multicast group is sent to described multicast service the user terminal that adds described multicast group.
11. the method by the multicast service among the WLAN (wireless local area network) WLAN multicast proxy control WLAN comprises step:
When the WLAN multicast proxy receives the first multicast service registration message from user terminal, the multicast forwarding of indicating the first access point AP to dispose an AP in response to the described first multicast service registration message,
Wherein, the described first multicast service registration message indicating user terminal requires to add or leave the multicast group at multicast service place, and licensed all user terminals of visiting described multicast group via an AP of the multicast forwarding of AP storage.
12. method according to claim 11, wherein, when the described first multicast service registration message indicating user terminal required to add described multicast group, the step of indicating an AP to dispose the multicast forwarding of an AP in response to the described first multicast service registration message comprised:
Check the access right of user terminal for described multicast group; And
When user terminal is licensed for access to described multicast group, indicate an AP that described user terminal is added in the multicast forwarding of an AP.
13. method according to claim 12 after indication the one AP is added into the multicast forwarding of an AP with described user terminal, also comprises:
The first multicast service registration message is transmitted to the multicast functional module of couple in multiplexer DSLAM, and the multicast functional module of DSLAM is arranged to and determines whether to add described multicast group to the network side informing user terminal.
14. method according to claim 11, wherein, when the described first multicast service registration message indicating user terminal requires to leave described multicast group, indicate the step of the multicast forwarding of AP configuration AP to comprise in response to the described first multicast service registration message:
Indicate an AP that user terminal is removed from the multicast forwarding of an AP.
15. method according to claim 13 indication the one AP removes user terminal from the multicast forwarding of an AP after, also comprises:
The first multicast service registration message is transmitted to the multicast functional module of couple in multiplexer DSLAM, and the multicast functional module of DSLAM is arranged to and determines whether to leave described multicast group to the network side informing user terminal.
16. method according to claim 11 also comprises step:
When the WLAN multicast proxy receives AP that indicating user terminal that AC produces switches to the 2nd AP from an AP when switching message,
Switch the multicast forwarding of message arrangement the one AP and the multicast forwarding of the 2nd AP in response to described AP, and
Produce the second multicast service registration message and the 3rd multicast service registration message,
Wherein, licensed all user terminals of visiting the multicast group at multicast service place via the 2nd AP of multicast forwarding storage of the 2nd AP, described second multicast service registration message indication is left described multicast group via the user terminal that an AP visits described multicast group, and described the 3rd multicast service registration message indicating user terminal adds described multicast group via the 2nd AP.
17. method according to claim 16 is characterized in that, the step of switching the multicast forwarding of the multicast forwarding of message arrangement the one AP and the 2nd AP in response to described AP specifically comprises:
Indicate an AP that user terminal is removed from the multicast forwarding of an AP;
Indicate the 2nd AP that user terminal is added in the multicast forwarding of the 2nd AP.
18. method according to claim 17 is characterized in that, indication the one AP removes user terminal from the multicast forwarding of an AP after, also comprises:
The second multicast service registration message is transmitted to the multicast functional module of couple in multiplexer DSLAM, to determine whether leaving described multicast group via the user terminal that an AP visits described multicast group to the network side notice.
19. method according to claim 17 is characterized in that, after indication the 2nd AP is added into the multicast forwarding of the 2nd AP with user terminal, also comprises:
The 3rd multicast service registration message is transmitted to the multicast functional module of couple in multiplexer DSLAM, to determine whether adding described multicast group via the 2nd AP to network side informing network terminal.
20. method according to claim 11 also comprises:
When DSLAM receives multicast service, multicast service is forwarded to an AP, a described AP is forwarded to all user terminals in its multicast forwarding according to its multicast forwarding with multicast service.
21. a WLAN multicast proxy that is used for controlling the multicast service of WLAN (wireless local area network) WLAN comprises:
First receiving device is used to receive the multicast service registration message from user terminal, and wherein said multicast service registration message indicating user terminal requires to add or leave the multicast group at multicast service place; And
The first multicast forwarding inking device is used for the multicast forwarding in response to described first multicast service registration message configuration WLAN multicast proxy.
22. WLAN multicast proxy according to claim 21 also comprises
Second receiving system is used to receive the access point AP switching message that couple in multiplexer DSLAM produces, and described AP switches the message indicating user terminal and switches to the 2nd AP from an AP; And
The second multicast forwarding inking device is used for switching in response to described AP the multicast forwarding of message arrangement WLAN multicast proxy.
23. a WLAN multicast proxy that is used for controlling the multicast service of WLAN (wireless local area network) WLAN comprises:
First receiving device is used to receive the multicast service registration message from user terminal, and wherein said multicast service registration message indicating user terminal requires to add or leave described multicast group; And
The first multicast forwarding inking device is used for indicating an AP to dispose the multicast forwarding of an AP in response to the described first multicast service registration message.
24. WLAN multicast proxy according to claim 23 also comprises:
Second receiving system is used to receive the AP that produces with DSLAM and switches message, and described AP switches the message indicating user terminal and switches to the 2nd AP from an AP; And
The second multicast forwarding inking device is applicable to: switch message in response to described AP and indicate an AP and the 2nd AP to dispose separately multicast forwarding respectively.
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