CN1327664C - Transmitter and method of asynchronous transmitting mode data flow - Google Patents
Transmitter and method of asynchronous transmitting mode data flow Download PDFInfo
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Abstract
The present invention relates to a retransmission device and a method for data stream service of a digital subscriber line access multiplexer in an asynchronous transmission mode. After DSLAM receives a data stream, an Ethernet frame is composed of ATM cells. The retransmission processing is carried out according to identification information of the Ethernet frame and the corresponding relation for identifying a multicast group and multicast VC or subscriber VC, and the Ethernet frame is converted into the ATM cells which are transmitted to an ATM switching passage. The ATM cells are transmitted to a network and/or subscriber terminal equipment by retransmission processing. Data of multiple multicast groups on the network side is put on one VC, so the present invention saves upstream connection resources and equipment investment so as to be beneficial to simplifying the group network. A multicast data stream and a single-cast data stream on the subscriber terminal side are put on one VC to bear a load, so the present invention avoids reconfiguring a plurality of subscriber terminals when multicast service is added, reduces the workload for maintenance and increases the efficiency. Each subscriber port saves the bandwidth occupation in the equipment according to the multicast data on the own multicast group receiving bus.
Description
Technical field
The present invention relates to the retransmission unit and the method for multicast data stream in a kind of high speed Internet access and the private line service, especially method and device that a kind of asynchronous transfer mode Digital Subscriber Line Access Multiplexer (Asynchronous TransferMode Digital Subscriber Line Access Multiplexer is called for short ATM DSLAM) is transmitted expeditiously to multicast data stream.Belong to communication technical field.
Background technology
At present, ADSL (Asymmetric Digital Subscriber Line) (Asymmetrical Digital Subscriber Loop, be called for short: ADSL) insert main still high speed Internet access and the private line service used, along with Internet video, the appearance of LMCSs such as long-distance education, stock information transmission in real time, the ADSL broadband access provides multicast service to become an inevitable trend.
Multicasting technology realizes that the network mid point transmits to the efficient data of multiple spot, after having adopted multicasting technology, source end server and backbone network only need transmit a multi-case data, on the access device of being close to the users most, just multi-case data is duplicated many parts and give different user, significantly reduced taking of the network bandwidth, effectively reducing network and source end server load, is the point-multipoint message traffic support technology that is fit to the most.
It is multiplexing that ATM DSLAM finishes the tandem that ADSL inserts, up by asynchronous transfer mode (Asynchronous Transfer Mode, abbreviation ATM) metropolitan area network is restrained and is converged, terminate in BAS Broadband Access Server (Broadband Access Server, abbreviation BAS) on the equipment, because atm interface and bandwidth kind are more, bottom can pass through synchronous digital hierarchy/PDH (Pseudo-synchronous Digital Hierarchy) (SDH/PDH) carrying, networking adaptability and autgmentability are strong, are the main flow equipment that ADSL inserts.
Because ATM towards connecting point-to-point transmission, realize a little that the multicast of multiple spot is the comparison difficulty.The existing technical scheme that solves ATM DSLAM multicast mainly adopts following this form: ATMDSLAM as a multicast server, is duplicated by putting multiple spot connection realization multicast in ATM DSLAM inside.
As shown in Figure 1, each multicast source 1 is all set up a virtual connections (Virtual Connection, abbreviation VC) is connected to ATM DSLAM, each user's distance terminal equipment (Remote Terminal Unit, be called for short RTU) go up except the VC that sets up the online use connects, also will set up dedicated multicast VC (can cause multicast cell and online cell to be staggered in together if use online VC to transmit multi-case data, cause the cell out of order), need to dispose multicast forwarding on the ATM DSLAM, the corresponding relation that the content of table the inside has been specified user's multicast VC and multicast source VC, ATM DSLAM receives multi-case data from multicast source VC, according to multicast forwarding multi-case data is copied on user's multicast VC of appointment then.
Particularly, the deficiencies in the prior art part is:
1, the Virtual Channel identifier/virtual path identifier (VPI/VCI) that connects by multicast source identifies multicast source, can not realize that a VC connects a plurality of multicast groups of carrying.Multicast forwarding need use the VPI/VCI of connection to adopt the different multicast sources of sign, each multicast source all must be as an ATM node, cause the waste of connection resource and equipment on the one hand, networking flexibility and simplicity have been reduced, on the other hand, increase new multicast source and will increase data configuration, the autgmentability of network is poor.
2, multicast stream needs to go downwards to DSLAM through different VC with unicast service stream.Unicast stream and multicast stream are different in the processing of DSLAM, and unicast stream only carries out simple interconnection on DSLAM; And multicast stream will carry out the multicast forwarding according to the VPI/VCI sign, causes unicast stream and multicast to flow down row and can not use same VC.
3, duplicate by putting multiple spot connection realization multicast ATM DSLAM inside, and efficient is not high; DSLAM inside will be carried out multi-case data and duplicated, and has increased the load of DSLAM equipment, is easy to become performance bottleneck when multi-case data is too much.
4, user RTU need dispose at least two VC, causes the terminal configuration more complicated.The configuration requirement of RTU is simple as far as possible, fixing.But it is out of order in order to prevent cell that DSLAM goes downwards to RTU, and unicast data and multi-case data need carry respectively at two VC, brings certain complexity for configuration RTU.
5, transmit according to multicast forwarding is fixing, the user can't dynamically add or leave certain multicast group.The user need receive each multicast group data, must propose to activate the service application to operator.Both made the user close multicast terminal software on the computer, when not needing to receive this multi-case data again, ATM DSLAM still can send to this multi-case data user RTU.And, because multicast forwarding is in charge of configuration by the network manager, causes and commence business dumbly, increased maintenance workload, and taken user bandwidth when not required the user.
The content of invention
Main purpose of the present invention is to provide a kind of retransmission unit and method of asynchronous transfer mode data flow, improve the forward efficiency of asynchronous transfer mode Digital Subscriber Line Access Multiplexer (ATM DSLAM) multicast data stream, network side multicast data stream and a plurality of users' unicast data stream can be placed on a up VC and go up carrying, improve networking flexibility and simplicity, strengthen the autgmentability of network.
Another object of the present invention is to provide a kind of retransmission unit and method of asynchronous transfer mode data flow, the multicast data stream of user side and unicast data stream can be placed on one and insert upward carrying of VC, the configuration needs simple fixation of user RTU.
Another purpose of the present invention is to provide a kind of retransmission unit and method of asynchronous transfer mode data flow, user on the ATM DSLAM equipment can dynamically add as required and leaves the multicast group, and no longer send multi-case data after leaving to user port, business development is flexible, and reduces maintenance workload.
The objective of the invention is to be achieved through the following technical solutions:
In order to improve the forward efficiency of ATM DSLAM multicast data stream under the asynchronous transfer mode, network side multicast data stream and a plurality of users' unicast data stream is placed on a up VC goes up carrying, the present invention adopts following device to realize:
This device connects atm network by network side VC, connect RTU by user side VC, its inside is provided with multicast main control module, data flow forwarding module, Subscriber Interface Module SIM and protocol conversion module, and this main control module connects data flow forwarding module and Subscriber Interface Module SIM; The data flow forwarding module comprises multicast forwarding module and clean culture forwarding processing module, is responsible for respectively multicast or unicast data are inserted side to network side forwarding and/or the forwarding of the user side from network side to access by Subscriber Interface Module SIM from the user; Protocol conversion module is used to carry out the shunting of protocol conversion, the multicast from the network side to the user side and unicast data between ATM and the Ethernet; Subscriber Interface Module SIM is used to connect user VC, is responsible for the converging of adaptive, access, multicast VC and clean culture VC of user's adsl line.Aforesaid, the present invention can improve networking flexibility and simplicity, strengthens the autgmentability of network.
Multicast main control module in described device inside of the present invention is connected with a protocol process module and is mutual, be used for and transmit processing from internet multicast management agreement (Internet Group Management Protocol is called for short IGMP) the application message that Subscriber Interface Module SIM is distinguished and transmitted.
When data flow from network side when user side transmits, described protocol conversion module is formed ethernet frame with cell and is stamped respective virtual local area network (LAN) (Virtual Local Area Network, be called for short VLAN) head, multi-case data and unicast data are shunted, according to the corresponding relation of multicast group address and multicast VC, the multicast frame is reverted to cell and send on the corresponding multicast VC; Perhaps, unicast data frames being resolved into cell according to the corresponding relation of the corresponding relation of VLAN and user VC and MAC and user VC with frame sends on the corresponding user VC.
When data flow from user side when network side transmits, described protocol conversion module is formed ethernet frame with user side VC cell according to the cell of link information exchange, link information according to configuration is stamped corresponding VLAN mark, and record source MAC and user VC corresponding relation, revert to cell flow subsequently again, and exchange to the VC of network side.
What also be provided with IGMP application message in the above-mentioned protocol process module catches processing module, IGMP application message requestor, or the igmp proxy module, and being respectively applied for to protocol process module provides the user to add or leave the information of multicast group.
For multicast data stream and the unicast data stream that realizes user side is placed on a upward carrying of access VC, the requirement of the configuration needs simple fixation of user RTU, device of the present invention, its network side VC is one, connect the BAS equipment that an end terminates in upper layer network, one end terminates on the protocol process module, and is middle through atm network, upstream Interface and ATM space bus; A user RTU meets a VC, and an end terminates on the RTU, and an other end terminates on the protocol process module, and middle through user RTU, adsl interface plate and ATM space bus, each user port is according to the multi-case data on the own place multicast group of received bus.
Above-mentioned device is specially DSLAM,
Above-mentioned device is arranged between user side and the network side, and finishes from the user side to the network side and transmit and/or the forwarding from the network side to the user side, and its concrete forwarding step comprises:
Step 3 is converted to ATM cell with ethernet frame, sends on the ATM interchange channel;
Step 4 sends to described ATM cell on network and/or the subscriber terminal equipment through transmitting to handle.
During from network side to the forwarding of access user side, further comprise in the above-mentioned step 1: after the above multicast source that network side VC goes up carrying enters described retransmission unit with the ATM cell of multicast data stream and unicast data stream, carry out protocol conversion earlier, ATM cell is formed ethernet frame; Step 4 comprises that further user RTU reverts to ethernet frame with ATM cell again by user VC, delivers on the subscriber terminal equipment.Wherein, the VC of network side is one.
Above-mentioned identifying information comprises according to link information the identifying information of ethernet frame encapsulation VLAN head or the identifying information of ethernet frame target MAC (Media Access Control) address.
In step 2, comprise further also ethernet frame shunted that if separating unicast frame or multicast frame are for unicast frame then enter the clean culture forwarding module and transmit processing, if handle for the multicast frame enters the multicast forwarding module; The multicast forwarding module is converted to ATM cell according to the corresponding relation of multicast group and multicast VC with the multicast ethernet frame, sends on the ATM interchange channel; The clean culture forwarding module is according to the target MAC (Media Access Control) address or the flag information of clean culture ethernet frame, and according to the correspondence table of MAC Address or VLAN and user VC sign, the ATM cell that ethernet frame is converted to respective user VC sends on the ATM interchange channel.ATM interchange channel described here is specifically as follows the ATM bus.
In above-mentioned step 4, comprise multicast reception table in the described retransmission unit, be used for reception and belong to the port multicast cell, and receive the unicast cell that belongs to user VC on this port, simultaneously, unicast cell and multicast cell are multiplexed on the user VC in order, a user RTU VC is one.
When data flow when user side is forwarded to network side, further comprise in the above-mentioned step 1: the ethernet frame that subscriber computer sends is decomposed into ATM cell by RTU, and is carried on the user VC, delivers to described retransmission unit; This retransmission unit is formed ethernet frame with cell, and the corresponding relation of source MAC and user VC sign is noted.
When data flow when user side is forwarded to network side, in step 2, also further judge whether to be unicast data stream or IGMP application message; If IGMP application message, then deliver to protocol process module, after protocol process module is handled IGMP application message, the result is sent into the multicast main control module, the multicast main control module carries out authentication to user's authority, authentication sends response to protocol process module by the back, notifies Subscriber Interface Module SIM will join in the multicast VC by the user port of authentication simultaneously; All the other unicast messages then revert to atm cell stream by protocol conversion module and are forwarded to network side VC.At this moment, a user RTU VC is one, and carrying inserts side from the user and transmits and/or transmit to inserting user side from network side to network side.
In order to make the user on the ATM DSLAM equipment can be as required, dynamically add or leave the multicast group, and after leaving, no longer send multi-case data to user port, it is flexible to reach business development, and the purpose of reduction maintenance workload, the present invention comprises that also the user dynamically adds/leave the treatment step of multicast group; Wherein,
Step 201: after the user opened a multicast application, computer sent the message that a request adds certain multicast group, i.e. IGMP application message;
Step 202: described retransmission unit receives the user side data flow by user VC, and checks whether be to add multicast group request message; If, then this retransmission unit with user VC sign and the multicast group record that will add in subscriber's meter;
Step 203: the VC of setting up a upright multicast at this multicast connects, and concurrent message informing adsl interface plate joins this user port in this multicast VC;
Step 204: if not, then these messages are reverted to atm cell stream via described retransmission unit, transmit to network side.
In step 202, comprise further that also DSLAM asks user right is carried out the processing of authentication, after authentication is passed through, could send response, and carry out follow-up processing.
When the user leaves the multicast group, send actively or passively and leave multicast group information, described retransmission unit obtains this information, and with the multicast VC deletion of user port from correspondence, the user no longer receives the message of this multicast group.Particularly, the passive information of leaving the multicast group of sending is that described retransmission unit is provided with the igmp querying device, send multicast general polling by user VC to all ADSL users at regular intervals, if certain user does not send response message in regulation in the long time, think that then the user has left the multicast group at place.And initiatively send the information of leaving the multicast group be when the user when leaving the multicast group, send the information of leaving to described retransmission unit, after retransmission unit receives and carries out the authentication judgement, think that then the user has left the multicast group at place.
According to technique scheme as can be known, the present invention has following obvious advantage:
1, a plurality of multicast group of network side data can be placed on a VC and go up carrying.
The a plurality of multicast group of network side data are placed on a VC and go up carrying, and a plurality of multicast streams can be provided by a multicast server, can save up connection resource and equipment investment effectively, also help the simplification of networking.
2, network side multicast data stream and unicast data stream can be placed on a VC and go up carrying.
Multicast data stream and unicast data stream can unite two into one, and have saved up connection resource, have reduced the attendant's of operator maintenance workload.
3, subscriber terminal side multicast data stream and unicast data stream can be placed on a VC and go up carrying.
The simplification meaning of terminal configuration is very great, and end side unicast data and multi-case data are placed on a VC and go up carrying, also needs to reconfigure a large amount of user terminals when having avoided the increase multicast service, has significantly reduced the work of maintenance personnel amount.
4, ATM DSLAM is inner realizes multicast by ATM space bus, saves system resource, raises the efficiency.
Do not duplicate and finish multicast by putting multiple spot, and be to use inner ATM space bus to realize multicast, each user port does not need CPU to carry out cell and duplicates according to the multi-case data on the own place multicast group of received bus, has saved the bandwidth occupancy of device interior yet.
5, the user on the ATM DSLAM equipment can add dynamically as required and leaves the multicast group, and no longer sends multi-case data after leaving to user port.
ATM DSLAM equipment can add the multicast group according to the control of authority user who sets in advance, and the user does not just send multi-case data to user port after leaving the multicast group, reduces the user port bandwidth occupancy, has improved forward efficiency.
Description of drawings
Fig. 1 is a plurality of multicasts, Wide Area Network, broadband access and the user RTU system schematic that constitutes based on ATM DSLAM equipment in the prior art.
Fig. 2 is a plurality of multicasts, Wide Area Network, broadband access and the user RTU system schematic that constitutes based on device of the present invention.
Fig. 3 is based on descending multicast of network side of the present invention and unicast service repeating process flow chart.
Fig. 4 is based on up multicast of user side of the present invention and unicast service repeating process flow chart.
Fig. 5 is device of the present invention adopts the ATM bus in server a structural representation.
Fig. 6 adds the process flowchart of multicast group for user of the present invention.
The process flowchart that Fig. 7 leaves from the multicast group for user of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments technical scheme of the present invention is done detailed description further.
As shown in Figure 2, the dotted line among the figure represents it is control flows transitive relation between each module, and solid line is represented is the annexation between each module and the direction of transfer of data flow; Wherein, carry out the mutual of multicast control message (IGMP applies for message) between protocol process module and the protocol conversion module.Wherein, the multicast main control module is responsible for control protocol processing module, multicast forwarding module and Subscriber Interface Module SIM.Design philosophy of the present invention is: can be placed on the VC in a plurality of multicast group of network side data and carry.If a plurality of multicast group of network side data are placed on a VC and go up carrying, a plurality of multicast streams can be provided by a multicast server, can effectively save up connection resource and equipment investment, also help the simplification of networking.Simultaneously, network side multicast data stream and unicast data stream can be placed on a VC and go up carrying.Multicast data stream and unicast data stream can unite two into one like this, have saved up connection resource, have reduced the attendant's of operator maintenance workload.
Have, subscriber terminal side multicast data stream and unicast data stream can be placed on a VC and go up carrying, and be very great for the simplification meaning of terminal configuration again.End side unicast data and multi-case data are placed on a VC and go up carrying, also need to reconfigure a large amount of user terminals when having avoided the increase multicast service, have significantly reduced the work of maintenance personnel amount.
Shown in Fig. 3,4, at the forwarding of upper strata multi-case data, the forwarding of multi-case data is unidirectional, and direction is to inserting side from network side.Concrete multicast of downlink or uplink of the present invention and unicast service are transmitted processing procedure:
One, descending multicast and unicast service repeating process:
After the ATM cell that network side VC upward carries enters device of the present invention (being DSLAM equipment), carry out protocol conversion (ATM is to IP) earlier, cell is formed ethernet frame, according to link information ethernet frame is stamped the VLAN head, then ethernet frame is carried out clean culture, multicast shunting, unicast frame then enters the clean culture forwarding module and transmits processing, and the multicast frame enters the multicast forwarding module and handles;
The multicast forwarding module according to the multicast group (1,2 ... .) and the corresponding relation of multicast VC (VC1, VC2...), the multicast ethernet frame is converted to ATM cell, and sends on the ATM bus (ATMBUS).
The clean culture forwarding module is according to the target MAC (Media Access Control) address or the VLAN of clean culture ethernet frame, and according to the correspondence table of MAC Address or VLAN and user VC sign, the ATM cell that ethernet frame is converted to respective user VC sends on the bus.
Subscriber Interface Module SIM receives according to the multicast reception table of main control module setting and belongs to the port multicast cell, and receives the unicast cell that belongs to user VC on this port, unicast cell and multicast cell is multiplexed into subscriber's line in proper order by former cell gets on; It is to be noted: can not produce the out of order of cell during the last carrying of ATM ethernet frame, before the cell that ethernet frame was divided into does not transmit and finishes, can not transmit the cell of other frames on the circuit.For example: the ethernet frame of a multicast, be partitioned into 4 cell A, B, C, D, the ethernet frame of a clean culture is partitioned into 1,2,3,4 four cell, and transmit leg sends ABCD1234 in the following order, after then repeatedly exchanging, arrived that this cell order can not change behind the recipient through the centre.Therefore need carry out multiplexing in proper order by former cell.Adopt above-mentioned method just can be not duplicate and finish multicast by putting multiple spot, and be to use inner ATM space bus to realize multicast, each user port is according to the multi-case data on the own place multicast group of received bus, do not need CPU to carry out cell and duplicate, just saved the bandwidth occupancy of device interior yet.Because a plurality of multicast group of network side data are placed on a VC and go up carrying, so a plurality of multicast streams can be provided by a multicast server, can effectively save up connection resource and equipment investment, also help the simplification of networking.
RTU reverts to ethernet frame with ATM cell again, delivers on subscriber computer or the set-top box.
Referring to Fig. 3, after the user left a multicast group, in order not take user bandwidth, DSLAM should stop to transmit to this user the message of this multicast group.Therefore need to determine whether the user leaves a multicast group.The concrete method of determining has:
1) a kind of is the leave message that can send a multicast group when supporting the user of IGMPV2 version to leave the multicast group, after DSLAM receives this message, then stops to transmit to this user the message of this multicast group;
2) use igmp querying: network equipment timed sending general query or group-specific query judge that the user is whether also in specific multicast group, utilize the general query message to inquire about the situation of these all groups of user place, after the user received general query, the all-multicast group report message at report of user place was given the network equipment.If the user is not at any group, then what is not done.
Whether the group-specific query message inquires about this user in specific multicast group.If the user receives the back not in this group then do not do anything, if in this group then report the report message of this group.
DSLAM equipment of the present invention regularly can each user in the multicast table send general query, promptly carries out igmp querying, catches the report message of user response then by protocol process module.If certain user is in certain multicast group in the multicast table, still do not receive for a long time the report message of this user's multicast group, then this user can be removed from this multicast group, no longer transmit the message of this multicast group to it.
Two, uplink service repeating process:
The multicast request that the user sends is placed on clean culture VC and goes up transmission, and up no multicast data stream has only unicast service.The ethernet frame that subscriber computer sends is decomposed into ATM cell by RTU, be carried on the user VC and deliver to Subscriber Interface Module SIM, Subscriber Interface Module SIM is formed ethernet frame with cell, the corresponding relation of source MAC and user VC sign is noted, because DSLAM equipment has been realized the agent functionality of IGMP application message, the IGMP application message that the user sends can terminate on the DSLAM, can not upload to network side VC, therefore, need to check whether upstream is IGMP application message, if IGMP request message, then deliver to protocol process module, after by protocol process module IGMP application message being handled, the result is sent into the multicast main control module, the multicast main control module carries out authentication to user's authority, and authentication sends response to protocol conversion module by the back, notifies Subscriber Interface Module SIM will join in the multicast VC by the user port of authentication simultaneously; Remaining unicast message is then delivered to the clean culture forwarding module and is handled, and reverts to atm cell stream by protocol conversion module more subsequently and is forwarded to network side VC.
The technical scheme that realizes multicast in device is as follows:
Referring to Fig. 5, authentication, the management of user's multicast channel, multicast users management, the configuration of data, the upstream Interface that main control module of the present invention carries out user's multicast authority such as provides at function.In 1 VC, what the uplink and downlink data were walked is different physical channels, is spatial separation like this.
Protocol process module carry out protocol conversion, multicast and unicast data between ATM and the Ethernet shunting, IGMP request message catch functions such as processing, igmp querying device, IGMP PROXY.Wherein, the module that the IGMP request is to use high speed logic to realize is operated in bottom.Mainly be to catch this message, and report high layer software according to the form of IGMP application message (request message, leave message); The igmp querying device is the function that high layer software is realized, the function of finishing mainly is that the ADSL user to all regularly sends general query, determines that user's multicast group adds situation; When receiving the IGMP leave message that the user sends, send group-specific query in addition, confirm whether this multicast group also has other users to exist; The IGMPPROXY module also is the function that high layer software is realized, mainly is to carry out agency service for the request and the leave message of multicast router to reporting of user, and sends the general query and the group-specific query of getting off for ADSL user answer multicast router.Main purpose is the flow attack that reduces multicast router, improves multicast efficient.The adsl interface plate finish user's adsl line adaptive, access, multicast VC and clean culture VC function such as converge.
Up VC connects the BAS equipment that an end terminates in upper layer network, and an end terminates on the protocol process module, and is middle through atm network, DSLAM upstream Interface and ATM space bus; There are many in user VC, and an end terminates on each RTU, and an other end terminates on the protocol process module, and is middle through user RTU, adsl interface plate and ATM space bus.
Network side VC arrives protocol process module with all cell switchings, protocol process module is formed cell ethernet frame and is stamped the corresponding VLAN head, multi-case data and unicast data are shunted, according to the corresponding relation of multicast group address and multicast VC, the multicast frame is reverted to cell and send on the corresponding multicast VC.
And for the forwarding of unicast data: the forwarding of unicast data has both direction, and one up, and one descending, and up direction refers to from the user and inserts side to network side, and down direction is opposite.
Therefore, when up, the VC cell of user side exchanges to according to link information that (the link information here is meant exchange message pre-configured on the DSLAM equipment on the protocol process module, mainly be corresponding relation of adsl port side VPI/VCI and ethernet vlan ID etc.), protocol process module is formed ethernet frame with cell again, link information according to configuration is stamped corresponding VLAN mark, and carries out the study of source MAC and user VC corresponding relation; Revert to cell flow subsequently again and exchange to the VC of network side.
The cell of down direction carries out framing, adds the processing such as shunting of VLAN head, multicast and clean culture after network side VC exchanges to protocol process module, unicast data frames resolves into cell according to the corresponding relation of the corresponding relation of VLAN and user VC and MAC and user VC with frame again and sends on the corresponding user VC then.
Data multiplex in the data feedback channel is finished jointly by ATM slave board bus and Bus Interface Chip, a plurality of Bus Interface Chips are arranged on the bus, one of them is as moderator, and each interface chip must obtain the token that moderator gives in the time of need sending data on the bus; After complete frame data transmission finishes, token could be transferred away.The service convergence that has so just guaranteed a plurality of adsl interface plates divides frame to the strictness in the protocol process module, and it is out of order can not to produce cell.There is not the problem of a plurality of data flow multiplexings in protocol process module to being point-to-point passage between the uplink interface board.
The transmission data multiplexing mode or the statistic multiplexing of the different port of same block of adsl interface plate.Bus Interface Chip adopts the training in rotation mode to send the cell of each adsl port, after each port sends a complete frame, just can send the data of next port.So just guaranteed also to send frame by frame when an adsl interface plate sends on the bus, it is out of order can not to produce cell.
Descending data are carried out framing earlier to protocol process module, the corresponding relation according to MAC Address and PVC (ADSL frame groove port) sends to each frame on each adsl port then.
In addition, ATM DSLAM is inner to realize multicast by ATM space bus, saves system resource, raises the efficiency.When not duplicating and finish multicast by putting multiple spot, and be to use inner ATM space bus to realize multicast, each user port does not need CPU to carry out cell and duplicates according to the multi-case data on the own place multicast group of received bus, has saved the bandwidth occupancy of device interior yet.
Shown in Fig. 6,7, the present invention's content again is that user on the ATM DSLAM equipment can add dynamically as required and leaves the multicast group, and no longer sends multi-case data after leaving to user port.
Particularly, the user adds being treated to of multicast group: after the user opens a multicast application, computer sends the message that a request adds certain multicast group, this message is broken down into ATM cell on RTU, exchange to protocol process module by corresponding user VC, protocol process module is formed ethernet frame with ATM cell, promptly according to, ethernet frame is carried on the agreement on the ATM: RFC1483B, and the frame of 1483B is reverted to ethernet frame; Bottom hardware logical foundation standard I GMP agreement is discerned this message and it is caught software to protocol process module, software according to this request message with user VC sign and the multicast group record that will add in subscriber's meter, send a higher layer message to main control module by message channel simultaneously, request is carried out authentication to this user's authority, after the main control module authentication is passed through, send response to protocol process module, set up the VC connection of a upright multicast simultaneously at this multicast, concurrent message informing adsl interface plate joins this user port in this multicast VC.
Leave the processing of multicast group for the user:
Determine that the user leaves certain multicast group two kinds of methods are arranged: one is the function that protocol process module provides the igmp querying device, send multicast general polling by user VC to all ADSL users at regular intervals, if certain user does not send response message for a long time, think that then the user has left the multicast group at place; In addition, the subscriber computer of support IGMPV2 agreement can send when leaving certain multicast group and leave multicast group message to upper layer network, thinks also after this message is captured by protocol process module that the user has left specific multicast group.
After finding that the user leaves certain multicast group, protocol process module sends higher layer message to main control module, and main control module sends a message to user board again, and with the multicast VC deletion of user port from correspondence, the user just can not receive the message of this multicast group again.
Therefore, the user on the ATM DSLAM equipment can add dynamically as required and leaves the multicast group, no longer sends multi-case data after leaving to user port.And ATM DSLAM equipment can add the multicast group according to the control of authority user who sets in advance, and the user does not just send multi-case data to user port after leaving the multicast group, reduces the user port bandwidth occupancy, the raising forward efficiency.
It should be noted last that: above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (25)
1, a kind of retransmission unit of asynchronous transfer mode data flow, described device connects atm network by network side VC, connect RTU by user side VC, it is characterized in that: described device inside is provided with multicast main control module, data flow forwarding module, Subscriber Interface Module SIM and protocol conversion module, and this main control module connects data flow forwarding module and Subscriber Interface Module SIM; The data flow forwarding module comprises multicast forwarding module and clean culture forwarding processing module, is responsible for respectively multicast or unicast data are inserted side to network side forwarding and/or the forwarding of the user side from network side to access by Subscriber Interface Module SIM from the user; Protocol conversion module is used to carry out the shunting of protocol conversion, the multicast from the network side to the user side and unicast data between ATM and the Ethernet; Subscriber Interface Module SIM is used to connect user VC, is responsible for the converging of adaptive, access, multicast VC and clean culture VC of user's adsl line.
2, device according to claim 1 is characterized in that: inner at described device, the multicast main control module is connected to protocol process module, is used for the IGMP application message of distinguishing and transmitting from Subscriber Interface Module SIM is transmitted processing.
3, device according to claim 1, it is characterized in that: described protocol conversion module is formed cell ethernet frame and is stamped the corresponding VLAN head, multi-case data and unicast data are shunted, according to the corresponding relation of multicast group address and multicast VC, the multicast frame is reverted to cell and send on the corresponding multicast VC.
4, device according to claim 1, it is characterized in that: described protocol conversion module is formed cell ethernet frame and is stamped the corresponding VLAN head, multi-case data and unicast data are shunted, unicast data frames is resolved into cell according to the corresponding relation of the corresponding relation of VLAN and user VC and MAC and user VC with frame send on the corresponding user VC.
5, device according to claim 1, it is characterized in that: described protocol conversion module is formed ethernet frame with user side VC cell according to the cell of link information exchange, link information according to configuration is stamped corresponding VLAN mark, and record source MAC and user VC corresponding relation, revert to cell flow subsequently again, and exchange to the VC of network side.
6, device according to claim 2, it is characterized in that: what protocol process module also was provided with IGMP application message catches processing module, IGMP application message requestor, or IGMP PROXY module, being respectively applied for to protocol process module provides the user to add or leaves the information of multicast group.
7, device according to claim 1 is characterized in that: the network side VC of this device is one, connects the BAS equipment that an end terminates in upper layer network, and an end terminates on the protocol process module, and is middle through atm network, upstream Interface and ATM space bus; A user RTU meets a VC, and an end terminates on the RTU, and an other end terminates on the protocol process module, and middle through user RTU, adsl interface plate and ATM space bus, each user port is according to the multi-case data on the own place multicast group of received bus.
8, according to each described device of claim 1-7, it is characterized in that: described device is DSLAM.
9, a kind of retransmission method of asynchronous transfer mode data streaming service, it is characterized in that, the retransmission unit of the described arbitrary asynchronous transfer mode data flow of claim 1-8 is arranged between user side and the network side, and finish from the user side to the network side and transmit and/or the forwarding from the network side to the user side, concrete forwarding comprises:
Step 1, described retransmission unit is formed ethernet frame with ATM cell after receiving data flow;
Step 2 is shunted ethernet frame, transmits processing according to the identifying information of ethernet frame and the correspondence table corresponding relation of multicast group and multicast VC or user VC sign;
Step 3 is converted to ATM cell with ethernet frame, sends on the ATM interchange channel;
Step 4 sends to described ATM cell on network and/or the subscriber terminal equipment through transmitting to handle.
10, method according to claim 9, it is characterized in that: transmit to inserting user side from network side, further comprise in the step 1: after the above multicast source that network side VC goes up carrying enters described retransmission unit with the ATM cell of multicast data stream and unicast data stream, carry out protocol conversion earlier, ATM cell is formed ethernet frame; Step 4 comprises that further user RTU reverts to ethernet frame with ATM cell again by user VC, delivers on the subscriber terminal equipment.
11, method according to claim 10 is characterized in that: the VC of network side is one.
12, method according to claim 9 is characterized in that: the identifying information in the step 2 comprises according to link information the identifying information of ethernet frame encapsulation VLAN head or the identifying information of ethernet frame target MAC (Media Access Control) address.
13, method according to claim 9, it is characterized in that: step 2 further comprises to be shunted ethernet frame, if separating unicast frame or multicast frame are for unicast frame then enter the clean culture forwarding module and transmit processing, if handle for the multicast frame enters the multicast forwarding module; The multicast forwarding module is converted to ATM cell according to the corresponding relation of multicast group and multicast VC with the multicast ethernet frame, sends on the ATM interchange channel; The clean culture forwarding module is according to the target MAC (Media Access Control) address or the flag information of clean culture ethernet frame, and according to the correspondence table of MAC Address or VLAN and user VC sign, the ATM cell that ethernet frame is converted to respective user VC sends on the ATM interchange channel.
14, method according to claim 13 is characterized in that: the ATM interchange channel is the ATM bus.
15, according to claim 9 or 10 described methods, it is characterized in that: step 4 comprises that also the multicast reception table reception of described retransmission unit belongs to the port multicast cell, and receive the unicast cell that belongs to user VC on this port, unicast cell and multicast cell are multiplexed on the user VC, and a user RTU VC is one.
16, method according to claim 15 is characterized in that: described be multiplexed with multiplexing in order.
17, method according to claim 9, it is characterized in that: be forwarded to network side from inserting user side, further comprise in the step 1: the ethernet frame that subscriber computer sends is decomposed into ATM cell by RTU, is carried on the user VC, delivers to described retransmission unit; This retransmission unit is formed ethernet frame with cell, and the corresponding relation of source MAC and user VC sign is noted.
18, method according to claim 17 is characterized in that: step 2 comprises that further judging whether is that unicast data stream or IGMP apply for message; If IGMP application message, then deliver to protocol process module, after protocol process module is handled IGMP application message, the result is sent into the multicast main control module, the multicast main control module carries out authentication to user's authority, authentication sends response to protocol process module by the back, notifies Subscriber Interface Module SIM will join in the multicast VC by the user port of authentication simultaneously; All the other unicast messages then revert to atm cell stream by protocol conversion module and are forwarded to network side VC.
19, according to claim 17 or 18 described methods, it is characterized in that: a user RTU VC is one, and carrying inserts side from the user and transmits and/or transmit to inserting user side from network side to network side.
20, method according to claim 9 is characterized in that: comprise that also a user dynamically adds/leave the step of multicast group, wherein,
Step 201: after the user opened a multicast application, computer sent the message that a request adds certain multicast group;
Step 202: described retransmission unit receives the user side data flow by user VC, and checks whether be to add multicast group request message; If, then this retransmission unit with user VC sign and the multicast group record that will add in subscriber's meter;
Step 203: the VC of setting up a upright multicast at this multicast connects, and concurrent message informing adsl interface plate joins this user port in this multicast VC;
Step 204: if not, then these messages are reverted to atm cell stream via described retransmission unit, transmit to network side.
21, method according to claim 20 is characterized in that: adding multicast group request message is IGMP application message.
22, method according to claim 20 is characterized in that: comprise further also in the step 202 that DSLAM asks this user's authority is carried out authentication, after authentication is passed through, send response, handle.
23, method according to claim 20, it is characterized in that: when the user leaves the multicast group, send actively or passively and leave multicast group information, described retransmission unit obtains this information, with the multicast VC deletion of user port from correspondence, the user no longer receives the message of this multicast group.
24, method according to claim 23, it is characterized in that: passively send that to leave multicast group information be that described retransmission unit is provided with the igmp querying device, send multicast general polling by user VC to all ADSL users at regular intervals, if certain user does not send response message in regulation in the long time, think that then the user has left the multicast group at place.
25, method according to claim 23, it is characterized in that: initiatively sending and leaving multicast group information is that the user is when leaving the multicast group, send leave message to described retransmission unit, described retransmission unit thinks that then the user has left the multicast group at place after receiving also authentication judgement.
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| CNB031542948A CN1327664C (en) | 2003-08-19 | 2003-08-19 | Transmitter and method of asynchronous transmitting mode data flow |
| PCT/CN2004/000911 WO2005015837A1 (en) | 2003-08-07 | 2004-08-06 | A method and system for implementing the transmission of the data packet |
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| CNB031542948A CN1327664C (en) | 2003-08-19 | 2003-08-19 | Transmitter and method of asynchronous transmitting mode data flow |
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| CN1327664C true CN1327664C (en) | 2007-07-18 |
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| FR2893204B1 (en) * | 2005-11-07 | 2008-02-01 | Thomson Licensing Sa | METHOD FOR RECEIVING AUDIOVISUAL CONTENTS FOR MULTIPLE DEVICES, SERVER AND APPARATUS USING THE METHOD |
| CN101197821B (en) * | 2006-12-05 | 2010-09-29 | 中兴通讯股份有限公司 | Method for implementing access network multicast in IPTV system |
| CN101242351B (en) * | 2007-02-09 | 2012-02-22 | 中兴通讯股份有限公司 | ATM transmission bandwidth receiving control method |
| CN101383754B (en) * | 2007-09-06 | 2012-12-12 | 华为技术有限公司 | Service transmission method, communication system and related equipment |
| CN101232408B (en) * | 2008-02-20 | 2010-09-29 | 中兴通讯股份有限公司 | Method and system for testing stability of mass of numeral subscriber line port for chain building and breaking |
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