CN102148815A - Video stream dispatching method and network node - Google Patents
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- CN102148815A CN102148815A CN2010105274531A CN201010527453A CN102148815A CN 102148815 A CN102148815 A CN 102148815A CN 2010105274531 A CN2010105274531 A CN 2010105274531A CN 201010527453 A CN201010527453 A CN 201010527453A CN 102148815 A CN102148815 A CN 102148815A
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Abstract
The invention discloses a video stream dispatching method and a network node. Firstly, different video streams are mapped into different subqueues according to the identifiable information of the video streams; then the priorities of different subqueues are determined according to preset requirements; and finally preset dispatching ways are adopted to dispatch the video streams in the subqueues according to the priorities of different subqueues. When a network is blocked, the embodiment implements corresponding dispatching operations on the video streams in the subqueues according to the priorities of different subqueues, so as to guarantee the normal use of other video streams in the network node, and the situation that the qualities of all the video streams in the network node are reduced simultaneously is avoided; moreover, redundant coding or special signaling interaction is not needed; therefore, the deployment is simple.
Description
Technical field
The present invention relates to the Streaming Media transmission field, relate in particular to a kind of dispatching method and network node of video flowing.
Background technology
Existing video traffic is relatively more responsive to packet loss, in case the message of similar video traffic forms congested at certain network port, this message of congestion avoidance mechanism meeting random drop of the network equipment, so As time goes on, the video quality of all video flowings all will be affected on this port, address the above problem the following two kinds of methods that mainly contain at present:
1, FEC (Forward Error Correction, forward error correction) technology: by at transmitting terminal being the additional error correction information of payload, the error code that when receiving terminal utilizes error correction information to correct payload in transmission, produces, specifically carry out transfer of data by the redundancy encoding mode, promptly after packet loss occurring, utilize the data packet recovery of redundant information in the above-mentioned redundancy encoding to losing;
2, RACS (Resource Access Control Subsystem, Resource and Admission Control Sub-system) admit control: RACS is according to AF (Application Function, Application Function) Shen Qing RSVP, whether enough to notify AF whether to allow to admit this video flowing in the back by the bandwidth of judging each network node on the video stream path, because the multicast application can not arrive AF under the multicast scene, the bandwidth of certain network node is occupied back RACS by multicast and is not known, so if support that multicast scene RACS also needs to carry out alternately with the network equipment.
In realizing process of the present invention, the inventor finds that there are the following problems at least in the prior art:
The coding redundancy degree is greater than 20% in the method 1, so it is low to produce code efficiency, the problem that bandwidth demand strengthens can cause postponing to increase especially when network congestion, also may cause some data and irreclaimable problem for the situation of continuous packet loss;
In the method 2 RACS and AF or and the network equipment between information interaction many, need special signaling to carry out alternately simultaneously, so the more complicated of dispose and because dynamic bandwidth can not be in time synchronous, can cause the generation of network congestion.
Summary of the invention
Embodiments of the invention provide a kind of dispatching method and network node of video flowing, when network congestion produces packet loss, have guaranteed the normal use of other video flowing in the network node, and dispose simple.
The embodiment of the invention provides a kind of dispatching method of video flowing, comprising:
Identity information according to video flowing is mapped to different video flowings in the different subqueues, determine the priority of described different subqueue according to predetermined requirement, described predetermined requirement is determined according to the time that connects, user type and/or the type that connects content;
Priority according to described different subqueue adopts predetermined scheduling mode that the video flowing in the subqueue is dispatched.
The embodiment of the invention provides a kind of network node, comprising:
Map unit is used for according to the identity information of video flowing different video flowings being mapped to different subqueues;
Priority determining unit is used for determining according to predetermined requirement the priority of subqueues different described in the map unit, and described predetermined requirement is determined according to the time that connects, user type and/or the type that connects content;
Scheduling unit is used for adopting predetermined scheduling mode that the video flowing of subqueue is dispatched according to the priority of described different subqueue.
The technical scheme that is provided by the embodiment of the invention described above as can be seen, it is when network congestion, priority according to different subqueues is dispatched processing accordingly to the video flowing in the subqueue, guaranteed the normal use of other video flowing in the network node, thereby can not cause the situation that the viewing quality of all video flowings descends simultaneously in the network node, and it does not need redundancy encoding or special Signalling exchange, so dispose simple.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of the dispatching method of the described a kind of video flowing of the embodiment of the invention;
Fig. 2 is the structural representation of the described a kind of network node of the embodiment of the invention;
Fig. 3 is scheduling to method flow schematic diagram that example be specifically described with a network node to video flowing for the embodiment of the invention is described.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
The dispatching method of a kind of video flowing of the embodiment of the invention as shown in Figure 1, comprising:
Step 11, different video flowings is mapped in the different subqueues according to the identity information of video flowing.
Particularly, generally include only a video flowing in each subqueue, can guarantee that like this each video flowing all has an independent buffer area, the video flowing of having avoided similar video traffic situation of packet loss at random in same formation has solved a plurality of video flowings are difficult to pick out the priority of each video flowing in the extremely short time in same formation problem simultaneously.The identity information of described video flowing comprises the IP information of User Identity information (ID) and/or video flowing, when having VLAN, can also comprise Virtual Local Area Network ID, concrete IP information can be the IP five-tuple information (source IP address, purpose IP address, source port number, destination slogan and protocol number) of video flowing; For example, the ID of a plurality of users in local area network (LAN) may be identical, also will by the IP information of video flowing distinguish in order to distinguish 8: 50 video flowings that connect and 9 video flowings that connect with identical ID this moment, is in order to guarantee user's fairness like this.
Step 12, determine the priority of different subqueues according to predetermined requirement.
Particularly, time, user type (high-end user or domestic consumer) that described predetermined requirement can connect according to video flowing and/or the type (multicast or program request) that connects content determine, can also according to as IP information (source IP address, purpose IP address, source port number, destination slogan and protocol number) etc. definite.
Step 13, adopt predetermined scheduling mode that the video flowing in the subqueue is dispatched according to the priority of different subqueues.
Particularly, described predetermined scheduling mode can comprise strict priority (SP, Strict Priority) mode or Weighted Fair Queuing modes such as (WFQ, Weighted Fair Queuing).For example, if adopt the SP mode when network congestion, from low to high video flowing to be carried out packet loss in strict accordance with the priority of subqueue and to handle.If adopting the WFQ mode can according to the product of the priority of the subqueue weight coefficient corresponding with it, carry out packet loss to video flowing and handle when network congestion.Wherein, network congestion is a kind of network state of sustained overload, this moment, video flowing surpassed fixing capacity to the demand of Internet resources (comprising link bandwidth, memory space and processor processing ability etc.), for example, network node can be supported 2000 video flowings, and video flowing has reached 2002, then can be called network congestion this moment.
Further, the priority of different subqueues is generally all distinguished in the header packet information of video flowing, for example, under the IP scene, video flowing Differentiated Services coding (DSCP in the header packet information of video flowing, Differentiated Services Code Point) back 3 bits can be used for showing the priority of different subqueues, and the priority that promptly can be set to " 000 " is higher than " 001 " and is higher than " 010 " and is higher than " 011 " and is higher than " 100 " and is higher than " 101 " and is higher than " 110 " and is higher than " 111 ".
As alternatively, can comprise the header packet information of scheduling back packet loss video flowing in step 14, the modify steps 12, and amended packet loss information is carried to the undernet node, be suitable for this video flowing only produces the part packet loss in the present networks node situation; For example, the open ended residual flow of present networks node is 1.5M, and the new video flowing that connects needs the 2M flow, will produce the packet loss of 0.5M this moment, will send into the undernet node to the video flowing behind the packet loss of above-mentioned new connection (flow is 1.5M) when dispatching so, the header packet information with amended packet loss video flowing is carried to the undernet node simultaneously.For example, under the IP scene, " 110 " or " 111 " of back 3 D-bit modifications of the DSCP in the header packet information that the packet loss video flowing takes place for the expression low priority, the undernet node that arrives at this video flowing also takes place when congested like this, can preferentially abandon this video flowing maybe the priority of this video flowing be set to low priority, thereby guarantee that other video flowings are not subjected to the influence of network congestion; For example, at multiprotocol label switching (MPLS, Multi-Protocol Label Switch) under the scene, the service priority that the video flowing of packet loss takes place is set to represent " 0 " of low priority, revise by message priority the packet loss video flowing, the high situation of video flowing priority of packet loss does not take place at the priority ratio of undernet node in the video flowing that can avoid present networks node generation packet loss occurring in present networks node or other network nodes, thereby guarantees the viewing quality of most of video flowing; And/or,
The packet loss information notice particular device of scheduling back packet loss video flowing in the step 12, dispatch by particular device, described particular device can be network management system (NMS) or strategic server (Policy Server), can notify particular device by modes such as alarm information or signalings, after described particular device is notified, meeting announcement information (the ICP of content supplier, Information Content Protocol) associated server stops this video flowing, can make other video flowings in the network keep good video flow like this; And/or,
The packet loss information of scheduling back packet loss video flowing is inquired about for particular device in the storing step 12, and described particular device can be network management system (NMS) or strategic server (Policy Server).
The embodiment of the invention can also be used in combination with AAA (Authentication Authorization andAccounting) authentication agreement, for example, determine the priority of the video flowing in the different subqueues according to user's grade (VIP user/domestic consumer), thereby ensure VIP user's bandwidth quality.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method, be to instruct relevant hardware to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-Only Memory, ROM) or at random store memory body (Random Access Memory, RAM) etc.
The embodiment of the invention also provides a kind of network node, as shown in Figure 2, comprising:
Particularly, generally include only a video flowing in each subqueue, can guarantee that like this each video flowing all has an independent buffer area, the video flowing of having avoided similar video traffic situation of packet loss at random in same formation has solved a plurality of video flowings are difficult to pick out the priority of each video flowing in the extremely short time in same formation problem simultaneously.The identity information of described video flowing comprises the IP information of User Identity information (ID) and/or video flowing, when having VLAN, can also comprise Virtual Local Area Network ID, concrete IP information can be the IP five-tuple information (source IP address, purpose IP address, source port number, destination slogan and protocol number) of video flowing; For example, the ID of a plurality of users in local area network (LAN) may be identical, also will by the IP information of video flowing distinguish in order to distinguish 8: 50 video flowings that connect and 9 video flowings that connect with identical ID this moment, is in order to guarantee user's fairness like this.
Particularly, time, user type (high-end user or domestic consumer) that described predetermined requirement can connect according to video flowing and/or the type (multicast or program request) that connects content determine, can also according to as IP information (source IP address, purpose IP address, source port number, destination slogan and protocol number) etc. definite.
Particularly, described predetermined scheduling mode can comprise strict priority (SP, Strict Priority) mode or Weighted Fair Queuing modes such as (WFQ, Weighted Fair Queuing).For example, if adopt the SP mode when network congestion, from low to high video flowing to be carried out packet loss in strict accordance with the priority of subqueue and to handle.If adopting the WFQ mode can according to the product of the priority of the subqueue weight coefficient corresponding with it, carry out packet loss to video flowing and handle when network congestion.Wherein, network congestion is a kind of network state of sustained overload, this moment, video flowing surpassed fixing capacity to the demand of Internet resources (comprising link bandwidth, memory space and processor processing ability etc.), for example, network node can be supported 2000 video flowings, and video flowing has reached 2002, then can be called network congestion this moment.
Further, the priority of different subqueues is generally all distinguished in the header packet information of video flowing, for example, under the IP scene, video flowing Differentiated Services coding (DSCP in the header packet information of video flowing, Differentiated Services Code Point) back 3 bits can be used for showing the priority of different subqueues, and the priority that promptly can be set to " 000 " is higher than " 001 " and is higher than " 010 " and is higher than " 011 " and is higher than " 100 " and is higher than " 101 " and is higher than " 110 " and is higher than " 111 ".
As alternatively, can also comprise:
Revise the unit, be used for revising the header packet information of scheduling unit 22 packet loss video flowings, and amended packet loss information is carried to the undernet node, be suitable for this video flowing only produces the part packet loss in the present networks node situation; For example, the open ended residual flow of present networks node is 1.5M, and the new video flowing that connects needs the 2M flow, will produce the packet loss of 0.5M this moment, will send into the undernet node to the video flowing behind the packet loss of above-mentioned new connection (flow is 1.5M) when dispatching so, the header packet information with amended packet loss video flowing is carried to the undernet node simultaneously.For example, under the IP scene, " 110 " or " 111 " of back 3 D-bit modifications of the DSCP in the header packet information that the packet loss video flowing takes place for the expression low priority, the undernet node that arrives at this video flowing also takes place when congested like this, can preferentially abandon this video flowing maybe the priority of this video flowing be set to low priority, thereby guarantee that other video flowings are not subjected to the influence of network congestion; For example, at multiprotocol label switching (MPLS, Multi-Protocol Label Switch) under the scene, the service priority that the video flowing of packet loss takes place is set to represent " 0 " of low priority, revise by message priority the packet loss video flowing, the high situation of video flowing priority of packet loss does not take place at the priority ratio of undernet node in the video flowing that can avoid present networks node generation packet loss occurring in present networks node or other network nodes, thereby guarantees the viewing quality of most of video flowing; And/or,
Notification unit is used for the packet loss information of scheduling unit 22 packet loss video flowings notice particular device is dispatched by particular device, and described particular device is network management system (NMS) or strategic server (Policy Server); Can notify particular device by modes such as alarm information or signalings, after described particular device is notified, meeting announcement information (the ICP of content supplier, Information Content Protocol) associated server stops this video flowing, can make other video flowings in the network keep good video flow like this; And/or,
Memory cell is used for the packet loss information that back packet loss video flowings are dispatched in memory scheduling unit 22, inquires about for particular device, and described specific equipment is network management system (NMS) or strategic server (Policy Server).
The specific implementation of the processing capacity of each unit that comprises in the said apparatus is described in method embodiment before, no longer is repeated in this description at this.
The embodiment of the invention is scheduling to example with a network node to video flowing and is specifically described, as shown in Figure 3:
Step 31, map unit 21 are mapped to different video flowings in the different subqueues according to the identity information of each video flowing, generally include only a video flowing in each subqueue, can guarantee that like this each video flowing all has an independent buffer area, the video flowing of having avoided similar video traffic situation of packet loss at random in same formation has solved a plurality of video flowings are difficult to pick out the priority of each video flowing in the extremely short time in same formation problem simultaneously.For example: the video flowing that can will have different I D according to user's ID is mapped in the different subqueues, the video flowing that also can will have different IP information according to the IP information of video flowing is mapped in the different subqueues, also can be mapped in the different subqueues with the video flowing that IP information will have different I D and IP information, can also video flowing be mapped in the different subqueues according to other label that can identify the video flowing identity information according to ID.
Step 32, priority determining unit 22 are determined the priority of different subqueues according to predetermined requirement.For example, can determine the priority of video flowing according to the time that video flowing connects, promptly video flowing A15 point 24 is tapped into network node, and video flowing B 15: 30 is tapped into network node, and the priority that video flowing A then can be set is higher than video flowing B; Also can sort according to the priority of video flowing type to video flowing, promptly video flowing A is a domestic consumer, and video flowing B is VIP user, and the priority that video flowing B then can be set is higher than video flowing A; Also can sort according to the priority of the type that connects content to video flowing, i.e. the content of video flowing A connection is a group broadcasting program, and the content that video flowing B connects is request program, and the priority that video flowing B then can be set is higher than video flowing A; Can also determine the priority of video flowing according to the type that connects time, user type and be connected content, can also help to guarantee that the requirement of user fairness determines the priority of video flowing according to other.
Step 33, scheduling unit 23 adopt predetermined scheduling mode that the video flowing in the subqueue is dispatched according to the priority of the different subqueue that priority determining unit 22 is determined, for example, can adopt the SP mode that video flowing is dispatched according to the priority of video flowing in the priority determining unit 22, promptly when network congestion, low priority video stream is carried out packet loss to be handled, for example, network node can be supported 200 video flowings, and the video flowing of network node has reached 201 at this moment, and that video flowing that will priority is minimum carries out packet loss to be handled; Also can adopt the WFQ mode that video flowing is dispatched according to the priority of subqueue in the priority determining unit 22, promptly according to the product of the priority of the subqueue weight coefficient corresponding with it, video flowing is carried out packet loss to be handled, when network congestion, to keep the data packet discarding of the subqueue of total formation full back arrival, the total formation of described maintenance is all internal memory sums that packet takies in the system; Scheduling mode in the time of can also adopting other network congestion is dispatched video flowing according to the priority of subqueue in the priority determining unit 22.
As optionally, step 34, revise the unit packet loss information of packet loss video flowing in the scheduling unit 23 is made amendment, and amended header packet information is carried to the undernet node, be suitable for this video flowing only produces the part packet loss in the present networks node situation; For example, the open ended residual flow of present networks node is 1.5M, and the new video flowing that connects needs the 2M flow, will produce the packet loss of 0.5M this moment, will send into the undernet node to the video flowing behind the packet loss of above-mentioned new connection (flow is 1.5M) when dispatching so, the header packet information with amended packet loss video flowing is carried to the undernet node simultaneously.For example, under the IP scene, with back 3 D-bit modifications of the DSCP in the header packet information of generation packet loss video flowing is " 110 " or " 111 " of low priority, and amended header packet information is carried to the undernet node, when if generation network congestion of undernet node and described undernet node do not adopt the application's video flowing dispatching method yet, then can preferentially abandon the video flowing of this generation packet loss, if the generation network congestion of undernet node and described undernet node have also adopted the application's video flowing dispatching method, the priority of video flowing that then can this generation packet loss is set to low priority or preferentially abandons the video flowing of this generation packet loss; Can make in the present networks node like this or in the undernet node other video flowing can not be subjected to the influence that network congestion causes, promptly guaranteed the viewing quality of most of video flowing.And/or,
Step 34, notification unit are specifically dispatched the packet loss information of packet loss video flowing in the scheduling unit 23 notice particular device by particular device, and described particular device can be network management system, also can be for strategic server etc.; For example, after particular device is received the packet loss information of packet loss video flowing, can notify the associated server of ICP to stop video flowing being offered this video flowing, can make other video flowings in the network keep good video flow like this.And/or,
Step 34, memory cell are stored the packet loss information of packet loss video flowing in the scheduling unit 23, inquire about for particular device, and described particular device can be network management system, also can be for strategic server etc.
The technical scheme of the embodiment of the invention can not increase the redundancy and the bandwidth demand of coding, does not need special Signalling exchange, disposes easily simple.Specifically the priority according to ordering rear video stream adopts predetermined scheduling mode to dispatch, avoided because the problem that network congestion causes video flowing viewing quality all in the network node to descend simultaneously, can network node surpass adopt under the situation can hold video flowing scheduling mode according to the priority of different subqueues to subqueue in corresponding video flowing carry out packet loss and handle, guarantee that the viewing quality of open ended other the most of video flowing of network node is unaffected.By the header packet information that the packet loss video flowing takes place being made amendment and notifying the scheme of downstream site, can make subsequent network node certain network node generation packet loss before can learning according to header packet information, thereby effectively handle or dispatch; Send to particular device by header packet information with the packet loss video flowing, can make the whole awareness network situation of particular device, and know each user's user mode, particular device can also be notified the user with packet loss information, with saving packet loss user's stand-by period, thus the video tastes of assurance video flowing.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (10)
1. the dispatching method of a video flowing is characterized in that, comprising:
Identity information according to video flowing is mapped to different video flowings in the different subqueues, determine the priority of described different subqueue according to predetermined requirement, described predetermined requirement is determined according to the time that connects, user type and/or the type that connects content;
Priority according to described different subqueue adopts predetermined scheduling mode that the video flowing in the subqueue is dispatched.
2. method according to claim 1 is characterized in that, also comprises:
Revise the header packet information of scheduling back packet loss video flowing, and amended packet loss information is carried to the undernet node;
And/or,
The packet loss information notice particular device of scheduling back packet loss video flowing, to dispatch by particular device, described particular device is network management system NMS or strategic server Policy Server;
And/or,
The packet loss information of packet loss video flowing after the memory scheduling is inquired about for particular device, and described particular device is network management system NMS or strategic server Policy Server.
3. method according to claim 1 is characterized in that, the identity information of described video flowing comprises the IP information of User Identity information (ID) and/or video flowing.
4. method according to claim 1 is characterized in that, the priority of described different subqueue is distinguished by the header packet information of video flowing in the subqueue.
5. method according to claim 1 is characterized in that, described predetermined scheduling mode comprises strict priority (sp) mode or weighted fair queuing (wfq) mode.
6. a network node is characterized in that, comprising:
Map unit is used for according to the identity information of video flowing different video flowings being mapped to different subqueues;
Priority determining unit is used for determining according to predetermined requirement the priority of subqueues different described in the map unit, and described predetermined requirement is determined according to the time that connects, user type and/or the type that connects content;
Scheduling unit is used for adopting predetermined scheduling mode that the video flowing of subqueue is dispatched according to the priority of described different subqueue.
7. network node according to claim 6 is characterized in that, also comprises:
Revise the unit, be used for revising the header packet information of described scheduling unit packet loss video flowing, and amended packet loss information is carried to the undernet node;
And/or,
Notification unit is used for the packet loss information of described scheduling unit packet loss video flowing notice particular device is dispatched by particular device, and described particular device is network management system NMS or strategic server Policy Server;
And/or,
Memory cell, the packet loss information that is used for storing described scheduling unit packet loss video flowing is inquired about for particular device, and described particular device is network management system NMS or strategic server Policy Server.
8. network node according to claim 6 is characterized in that, the identity information of the video flowing described in the described map unit comprises the IP information of User Identity information (ID) and/or video flowing.
9. network node according to claim 6 is characterized in that the priority of different subqueues is distinguished by the header packet information of video flowing in the subqueue in the described priority determining unit.
10. network node according to claim 6, it is characterized in that, described scheduling unit is used to adopt predetermined scheduling mode that the video flowing of different priorities is dispatched, and described predetermined scheduling mode comprises strict priority (sp) mode or weighted fair queuing (wfq) mode.
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