CN100499567C - Method for realizing video multicast service medium frequency switch - Google Patents
Method for realizing video multicast service medium frequency switch Download PDFInfo
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- CN100499567C CN100499567C CNB2004100524770A CN200410052477A CN100499567C CN 100499567 C CN100499567 C CN 100499567C CN B2004100524770 A CNB2004100524770 A CN B2004100524770A CN 200410052477 A CN200410052477 A CN 200410052477A CN 100499567 C CN100499567 C CN 100499567C
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Abstract
A method for realizing channel switching in video multicasting service includes setting an acceleration module in broadband access equipment to process IGMP message for channel switching by auxiliary module of said acceleration module, said method contains the data transmitting module sending the user received IGMP message to acceleration module to be primary processed, then the processed user information sent to control module for further processing to update for realize channel switching. Said primary process includes validity check and user authorization. Said invention greatly raises the ability of processing IGMP message and insures channel switching speed in providing video multicasting service.
Description
Technical field
The present invention relates to communication technical field, relate in particular to the implementation method that a kind of video multicasting mid band is switched.
Background technology
Multicast is that a kind of one or more senders of permission (multicast source) send the network technology of identical packet to a plurality of recipients simultaneously, be a kind of can be under the situation that does not increase the backbone network load, therefore the effective scheme of the service-user quantity that is multiplied also becomes the first-selection of current big flow video traffic.Adopting the IP multicast packets to come the distribution of video program to flow to the user, is exactly video multicast.Concerning operator, video multicasting is more and more important, no matter be the cable TV market of wanting to become real full-service operator, seizing high yield, still only want that by carrying out attractive broad band value-added service, using broadband networks the problem that solves broadband carrying video traffic all is the task of top priority to attract more user.Operators wish the broad band bearing of broadband access equipment (for example Digital Subscriber Line Access Multiplexer DSLAM) as video data, provide up to a hundred multicast channels by contracting with a plurality of television programming providers, require the equipment of broadband access equipment, realize that controllable multicast, big capacity multicast forwarding list item, channel switch corresponding characteristics such as quick as the last user of access.
In the solution of video multicasting, the multicast channel (the corresponding multicast group of each channel) that the video multicast user adds or leave appointment by sending IGMP (internet multicast management agreement) adding or leave message realizes that channel switches.Be illustrated in figure 1 as channel handoff procedure schematic diagram, handoff procedure is as follows:
A, user are when viewing channel 1, and access device duplicates channel 1 to video user;
B, when the user wishes to switch to channel 2 by the channel of watching 1, he at first sends IGMP leave (leaving) message to access device, leaves channel 1 to the access device request;
C, access device are handled (main treatment step is with reference to following description) after receiving this message, the user is deleted from the user list of channel 1, stop to duplicate the content of channel 1 to the user;
D, the user sends IGMP report (report) message to access device then, requires to add channel 2;
E, access device are handled after receiving this message, the user are added in the user list of channel 2, duplicate the content of channel 2 and give the user.
At present, broadband access equipment (as DSLAM) relies on the processing of software realization to the IGMP message fully.As shown in Figure 2, DSLAM can be divided into control module and data forwarding processing module.Control module is finished the control to equipment, and the processing of control message, it is responsible for the maintenance and the processing of various forwarding informations (comprising user profile, User Status, multicast forward table or the like), therefore all gives control module from the IGMP message in the user's message and handles.The data forwarding processing module utilizes these forwarding informations to finish duplicating and transmitting of user data frame.Usually, control module belongs to software section, and the data forwarding processing module belongs to hardware components.
Be illustrated in figure 3 as the handling process exemplary plot of access device, after the data forwarding processing module receives the message of user A, at first judge whether the IGMP message, if not, other handling processes (irrelevant) then adopted with the present invention.If then entire I GMP message is given control module and is handled.Control module is as follows to the main treatment step of these messages:
1, validity checking: whether the IGMP message of checking the user meets the IGMP protocol requirement, comprises the inspection of IP head, the inspection of IGMP message header.If illegal, then message will be dropped.
2, subscription authentication: after validity checking is passed through, from user's message, extract the user and want the multicast group G that adds or leave, check whether user A has the power of watching his desired channel (being multicast group G).Preserved the information of the channel that each user can watch among the DSLAM, receive the IGMP message after, check in the channel that the user can watch whether the specified channel that will add (or leaving) of message arranged.If no, dropping packets then.
3, the multicast forwarding list item is safeguarded and refreshed: the multicast forward table of DSLAM is kept in the data forwarding processing module, and multicast forward table comprises the user list of watching of each channel.After subscription authentication was passed through, control module was safeguarded user list and is refreshed, if the IGMP message is to join message, increased this user A then in multicast forward table the user list of corresponding channel G; If leave message deletes this user A then in multicast forward table the user list of corresponding channel G.
By these processing, the data forwarding processing module is carried out channel according to multicast forward table and is duplicated, and can realize the control (controllable multicast) to the multicast packet stream distribution, finishes user channel and switches.In addition, if realize that note take, characteristics such as safe, also to note down to user's adding, time of leaving certain channel.
When the video multicasting scale was commercial, each DSLAM need insert a large number of users (hundreds of even thousands of).Consider that the user often needs switching channels (especially when not having good-looking program), need the flow of the IGMP message that DSLAM handles very big, rely on software processes might cause the performance bottleneck of CPU fully.In case CPU is because load is excessive, and in time the IGMP message of process user will cause user channel switching time long (or even not switching channel), the user will descend greatly to the satisfaction of operator.
Summary of the invention
Technical problem to be solved by this invention is: overcome in the existing video multicast broadband access equipment and rely on software to realize that channel switches fully, when load is excessive, cause channel long shortcoming switching time easily, the implementation method that provides a kind of video multicast mid band to switch, thereby effectively reduce cpu load, improve systematic function.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be:
The implementation method that this video multicasting mid band is switched, one hardware accelerator is set in broadband access equipment, utilize this hardware accelerator assist control module to finish the processing of internet multicast management agreement message, the realization channel switches, and may further comprise the steps: the data forwarding processing module will send to hardware accelerator from the internet multicast management agreement IGMP message that the user receives; Hardware accelerator carries out validity checking to the internet multicast management agreement IGMP message that receives, and extracts user profile from this IGMP message by validity checking, gives control module with this user profile; Control module is handled according to this user profile again, and refresh data is transmitted the multicast forward table on the processing module, realizes that channel switches.
Whether described validity checking meets the validity checking that internet multicast management agreement requires for the internet multicast management agreement message to the user.Hardware accelerator can also check whether the user has the subscription authentication of the power of watching the channel that requires.
Subscription authentication can have following several implementation method:
1, set up the authentication the table whether user adds multicast service in hardware accelerator, during subscription authentication, hardware accelerator after authentication is passed through, reports control module to relevant user information according to user number inquiry authentication table.
2, in hardware accelerator, set up the authentication table of user number, channel and user right corresponding relation, during subscription authentication, hardware accelerator removes to look into the authentication table according to specified channel in user number and the internet multicast management agreement message, check whether the user has the power of watching specified channel, after authentication is passed through, relevant user information is reported control module.
3, in hardware accelerator, set up the authentication table of user and set meal corresponding relation, and whether set meal number, channel and this set meal number comprise the authentication table of the corresponding relation of this channel; When subscription authentication, search the set meal that the user selects according to user number earlier, want the channel that adds or leave according to user in set meal number and the internet multicast management agreement message again, check whether the user has the power of watching specified channel, after authentication is passed through, relevant user information is reported control module.
After described validity checking or validity checking and subscription authentication were checked, the user profile that hardware accelerator reports control module comprised multicast group IP address that user number, type of message and user need add or the value corresponding with this IP address, multicast group IP address that the user need leave or the value corresponding with this IP address.Hardware accelerator can adopt application-specific integrated circuit (ASIC), programmable logic chip or network processor chip to realize.
Beneficial effect of the present invention is: the invention provides a kind of auxiliary method of finishing the processing of IGMP message of accelerating module of using, use special-purpose high-performance accelerating module to finish the analyzing and processing of user IGMP message, result is reported control module, refresh User Status and multicast forward table by control module, thereby realize the switching of video multicast mid band.Make on broadband access equipment and can effectively reduce the load of carrying out video multicast when service CPU in this way, thereby improve systematic function, the robustness of enhanced system provides user's satisfaction.The invention enables the performance of system handles IGMP message to improve greatly, when system provides the video multicasting of scale commercialization, can guarantee the speed of user's switching channels, make the user obtain the experience identical with cable TV.
Description of drawings
Fig. 1 is a video multicasting mid band switching flow schematic diagram;
Fig. 2 is the realization principle schematic that existing video multicasting mid band is switched;
Fig. 3 is the process chart of existing video multicasting mid band access device when switching;
The realization principle schematic that Fig. 4 switches for video multicasting mid band of the present invention;
The process chart of access device when Fig. 5 only does the inspection of IGMP message validity for accelerating module of the present invention;
The process chart of access device when Fig. 6 does inspection of IGMP message validity and subscription authentication for accelerating module of the present invention.
Embodiment
With embodiment the present invention is described in further detail with reference to the accompanying drawings below:
The present invention tells a part with the IGMP processing capacity from the control module of access device, increase accelerating module in access device, utilizes the auxiliary processing of finishing the IGMP message of accelerating module.Accelerating module receives user's IGMP message, finish preliminary treatment (as work such as validity checking, subscription authentications) to user profile, then user profile is given control module and handle (the user profile that reports according to accelerating module as control module, revise user state information, refresh and safeguard multicast forward table).
Accelerating module can adopt ASIC (application-specific integrated circuit (ASIC)), FPGA (field programmable gate array), NP chips such as (network processing units) to realize, owing to increase accelerating module, adopt hardware and software to cooperate and finish the processing of IGMP, thereby can reduce the load of CPU greatly.Specifically can adopt following two kinds of schemes:
1, accelerating module is only done validity checking
Hardware accelerator is only done validity checking, authentication, transmits and refreshes maintenance and still finished by software control module (being CPU).The processing of hardware is fairly simple in this case, only needs to check the legitimacy of IGMP bag, and the user profile by the bag checked is reported CPU.Treatment step main distinction when not using accelerating module is: the data forwarding processing module is given accelerating module with the IGMP message and is done validity checking, what give control module after accelerating module is handled is not entire I GMP message, but succinct user profile.
As shown in Figure 5, after the data forwarding processing module receives the message of user A, at first judge whether the IGMP message, if not, other handling processes (irrelevant) then adopted with the present invention.If then entire I GMP message is given accelerating module and is handled.Accelerating module carries out validity checking to these messages, checks whether user's IGMP message meets the IGMP protocol requirement, if illegal, then message will be dropped.After validity checking is passed through, from user's message, extract user profile and give the control module processing.User profile comprises: user number (accounts for 12BIT, be user's corresponding physical circuit port number), type of message (accounts for 1BIT, join message as 0 expression leave message, 1 expression), the user wants to add or the IP address (accounting for 32BIT) of the multicast group G that leaves or the value of this multicast ip address correspondence (account for 12BIT, the value that obtains by the HASH computing as this multicast ip address, or directly get the low 12 of IP address), structure can according to the form below shown in:
| CID(12bit) | OpType(1bit) | Group(32/12bit) |
| User number (corresponding physical circuit port number) | Type of message, 0=leaves, and 1=adds | Group number=need adds the multicast ip address of (or leaving), perhaps corresponding with this multicast ip address value (as by the HASH computing, or directly getting low 12 of IP address) |
Control module is carried out subscription authentication according to these information, checks whether user A has the power of watching his desired channel (being multicast group G).If no, dropping packets then.After subscription authentication was passed through, control module was safeguarded user list and is refreshed, if the IGMP message is to join message, increased this user A then in multicast forward table the user list of corresponding channel G; If leave message deletes this user A then in multicast forward table the user list of corresponding channel G.Carry out duplicating of channel by the data forwarding processing module according to transmitting, thereby realize that channel switches.
2, accelerating module is finished validity checking and subscription authentication
After accelerating module checks out the legitimacy of packet, also can report control module (CPU) to information again after finishing subscription authentication, the user profile form is the same, and CPU just only need maintenance transmit just passable like this.
As shown in Figure 6, after the data forwarding processing module receives the message of user A, at first judge whether the IGMP message, if not, other handling processes (irrelevant) then adopted with the present invention.If then entire I GMP message is given accelerating module and is handled.Accelerating module carries out validity checking to these messages, checks whether user's IGMP message meets the IGMP protocol requirement, if illegal, then message will be dropped.After validity checking is passed through, extract the user and want the multicast group G that adds or leave from user's message, accelerating module carries out subscription authentication according to these information, checks whether user A has the power of watching his desired channel (being multicast group G).If no, dropping packets then.After subscription authentication was passed through, accelerating module extracted user profile and gives control module and handle from user's message, the form of user profile can the same table shown in.Control module is safeguarded user list and is refreshed, if the IGMP message is to join message, increases this user A then in multicast forward table the user list of corresponding channel G; If leave message deletes this user A then in multicast forward table the user list of corresponding channel G.Carry out duplicating of channel by the data forwarding processing module according to transmitting, thereby realize that channel switches.
In the above-mentioned steps, hardware accelerator determines by looking into the authentication table whether the user has the power that adds or leave certain channel.The mode of authentication mainly contains 3 kinds:
1) user or can watch all channels, or can not watch any channel
, number of channels under test when business can adopt this method seldom the time.Set up the authentication the table whether user adds multicast service in accelerating module, accelerating module receives after IGMP bag and validity checking pass through, and inquiry authentication table if added multicast service, then reports control module to relevant information.The authentication list data structure is as follows:
| The user | Whether add multicast service |
| The user 1 | Be |
| The user 2 | Not |
| …… |
2) channel that can free selection need watch of each user
In accelerating module, set up the authentication table of user number, channel (being the value of multicast group number or this multicast group IP address correspondence), user right corresponding relation, accelerating module is when carrying out subscription authentication, remove to look into the authentication table according to channel specified among user number and the IGMP as searching KEY, check whether the user has the power of watching channel specified among the IGMP.The authentication table can adopt following data structure:
A kind of implementation method of authentication table is as follows:
Suppose always to have 256 channels, to each channel, user's authority is divided into can watch and cannot watch.Then give 256 bit of each user (32 bytes), the corresponding channel of each bit.When the bit of channel correspondence value was 1, the expression user right was to represent and cannot watch in 0 o'clock for can watch this channel.Corresponding relation is as follows:
When this structure was commenced business, the user can select the channel that he liked neatly, and each user can select the combination in any of these channels, only need the user selects that the bit of the channel correspondence of watching is set to 1, remaining is set to 0 and gets final product.
3) select some kinds of combinations of channels, as set meal, the user can only select a set meal
A lot (〉 256 of the number of channels of carrying out when system) time, use the 2nd) the kind method realizes that cost is bigger, system maintenance management user profile is difficulty relatively also.Therefore can adopt the way of set meal.In accelerating module, set up the authentication table of the corresponding relation of user and set meal, and whether set meal number, channel, this set meal number comprise the authentication table of the corresponding relation of this channel.Selecting a set meal with each user is example, and step is as follows:
A, at first table look-up according to user number and determine the set meal that the user selects, the relation table form is as follows:
| The user 1 | Set meal 4 |
| The user 2 | Set meal n |
B, then wants to add or the channel left removes to look into the authentication table as searching KEY according to user in set meal number and the IGMP bag, checks whether the user has the power of watching channel specified among the IGMP.The authentication list data structure is as follows:
Suppose that the set meal number is no more than 32, then give 32 bit of each channel, the corresponding set meal of each bit.When the bit of set meal correspondence value is 1, represent that this set meal comprises this channel, be to represent that this set meal did not comprise this channel at 0 o'clock.Physical storage structure can be as follows:
| The address | bit31 | bit30 | …… | bit0 |
| Channel 1 | Set meal 32 | Set meal 31 | …… | Set meal 1 |
| Channel 2 | Set meal 32 | Set meal 31 | …… | Set meal 1 |
| … | …… |
The invention provides a kind of auxiliary method of finishing the processing of IGMP message of accelerating module of using, use special-purpose high-performance accelerating module to finish the analyzing and processing of user IGMP message, result is reported control module, refresh User Status and multicast forward table by control module.Make on broadband access equipment and can effectively reduce the load of carrying out video multicast when service CPU in this way, thereby improve systematic function, the robustness of enhanced system provides user's satisfaction.The invention enables the performance of system handles IGMP message to improve greatly, when system provides the video multicasting of scale commercialization, can guarantee the speed of user's switching channels, make the user obtain the experience identical with cable TV.
Those skilled in the art do not break away from essence of the present invention and spirit, can there be the various deformation scheme to realize the present invention, the above only is the preferable feasible embodiment of the present invention, be not so limit to interest field of the present invention, the equivalent structure that all utilizations specification of the present invention and accompanying drawing content are done changes, and all is contained within the interest field of the present invention.
Claims (8)
1, a kind of implementation method of video multicasting mid band switching is characterized in that,
One hardware accelerator is set in broadband access equipment, utilizes this hardware accelerator assist control module to finish the processing of internet multicast management agreement IGMP message, realize that channel switches, and may further comprise the steps:
The data forwarding processing module will send to hardware accelerator from the internet multicast management agreement IGMP message that the user receives;
Hardware accelerator carries out validity checking to the internet multicast management agreement IGMP message that receives, and extracts user profile from this IGMP message by validity checking, gives control module with this user profile;
Control module is handled according to this user profile again, and refresh data is transmitted the multicast forward table on the processing module, realizes that channel switches.
2, the implementation method of video multicasting mid band switching according to claim 1 is characterized in that: whether described validity checking meets the validity checking that internet multicast management agreement requires for the internet multicast management agreement message to the user.
3, the implementation method of video multicasting mid band switching according to claim 2, it is characterized in that: described hardware accelerator carries out the internet multicast management agreement IGMP message that receives comprising also whether hardware accelerator inspection user has the subscription authentication of the power of watching the channel that requires after the validity checking.
4, the implementation method of video multicasting mid band switching according to claim 3, it is characterized in that, described hardware accelerator checks whether the user has the subscription authentication of the power of watching the channel that requires to be specially: set up the authentication the table whether user adds multicast service in hardware accelerator, during subscription authentication, hardware accelerator is according to user number inquiry authentication table, after authentication is passed through, relevant user information is reported control module.
5, the implementation method that video multicasting mid band according to claim 3 is switched, it is characterized in that, described hardware accelerator checks whether the user has the subscription authentication of the power of watching the channel that requires to be specially: set up user number in hardware accelerator, the authentication table of channel and user right corresponding relation, during subscription authentication, hardware accelerator removes to look into the authentication table according to specified channel in user number and the internet multicast management agreement message, check whether the user has the power of watching specified channel, after authentication is passed through, relevant user information is reported control module.
6, the implementation method of video multicasting mid band switching according to claim 3, it is characterized in that, described hardware accelerator checks whether the user has the subscription authentication of the power of watching the channel that requires to be specially: set up the authentication table of user and set meal corresponding relation in hardware accelerator, reach the authentication table whether set meal number, channel and this set meal number comprise the corresponding relation of this channel; When subscription authentication, search the set meal that the user selects according to user number earlier, want the channel that adds or leave according to user in set meal number and the internet multicast management agreement message again, check whether the user has the power of watching specified channel, after authentication is passed through, relevant user information is reported control module.
7, the implementation method of switching according to the described video multicasting mid band of arbitrary claim in the claim 1 to 6 is characterized in that: described user profile comprises multicast group IP address that multicast group IP address that user number, type of message, user need add or the value corresponding with this IP address and user need be left or the value corresponding with this IP address.
8, the implementation method of video multicasting mid band switching according to claim 7 is characterized in that: described hardware accelerator adopts application-specific integrated circuit (ASIC), programmable logic chip or network processor chip to realize.
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| CNB2004100524770A CN100499567C (en) | 2004-12-02 | 2004-12-02 | Method for realizing video multicast service medium frequency switch |
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| CNB2004100524770A CN100499567C (en) | 2004-12-02 | 2004-12-02 | Method for realizing video multicast service medium frequency switch |
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| CN100499567C true CN100499567C (en) | 2009-06-10 |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007140702A1 (en) * | 2006-06-09 | 2007-12-13 | Huawei Technologies Co., Ltd. | Multicast service processing method and access equipment |
| CN101521626B (en) * | 2006-07-24 | 2012-08-29 | 华为技术有限公司 | Method for stepping control of multicast programs and access equipment |
| CN101242340B (en) * | 2007-02-08 | 2011-08-10 | 华为技术有限公司 | A method, device and system for terminal device to switch multicast service |
| CN100551044C (en) * | 2007-04-06 | 2009-10-14 | 华为技术有限公司 | Realize method, equipment and the system of net cast |
| CN101060616A (en) * | 2007-05-18 | 2007-10-24 | 华为技术有限公司 | A method for providing the program information, program indexing equipment, video equipment and system |
| CN101552920B (en) * | 2008-03-31 | 2011-08-10 | 华为技术有限公司 | Media stream encoding method, media stream encoding device and media stream encode switching system |
| CN101605040B (en) * | 2008-06-12 | 2012-10-10 | 中兴通讯股份有限公司 | Multicast control method under single-port and multi-user access mode and device |
| CN101753973B (en) | 2008-12-12 | 2013-01-02 | 华为技术有限公司 | Channel switching method, device and system |
| CN101599903B (en) * | 2009-06-26 | 2011-11-30 | 中国电信股份有限公司 | Multicast group control stream generation device, and method and device for managing multicast group data stream |
| CN103036807B (en) * | 2012-11-29 | 2015-09-02 | 深圳市共进电子股份有限公司 | A kind of optimization method of interactive network TV service |
| CN104243412B (en) * | 2013-06-15 | 2019-03-05 | 深圳市振华微电子有限公司 | Network data processing terminal and method in wherein network data |
| CN111200561B (en) * | 2019-12-31 | 2022-03-15 | 奇安信科技集团股份有限公司 | Data packet transmission method and device, computer system and readable storage medium |
| CN113709272B (en) * | 2021-08-26 | 2024-01-19 | 无锡思朗电子科技有限公司 | Method for improving image switching speed |
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