CN103997464B - System and method for the real time continuous data in control packet switched traffic - Google Patents

Abstract

The title of the present invention is " system and method for the real time continuous data in control packet switched traffic ".The present invention relates to the methods of the real time continuous data in packet-switched traffic of the control comprising data packet.The control of the real time continuous data is executed by retaining the data packet of the packet-switched traffic, to upset the continuity of the data after receiving the real time continuous data.The invention further relates to a kind of systems for controlling the real time continuous data, and this system is used in packet switched data network, and the real time continuous data service provided in aforementioned manners.

Description

System and method for the real time continuous data in control packet switched traffic

The parent application day of this divisional application is on April 29th, 2005, application No. is 200580049650.4, denominations of invention " for method, system and its use of the real time continuous data in control packet switched traffic, to be provided with the method Real time continuous data service ".

Technical field

The present invention relates to a kind of the unauthorized of the real time continuous data in packet-switched traffic of the control comprising data packet The method of transmission.

The invention further relates to a kind of for carrying out the real time continuous data in control packet switched traffic using the above method Unauthorized transmission system, wherein the packet-switched traffic includes data packet, the system comprises described for receiving The input of data flow and output for sending the data flow.

The invention further relates to use of this system in packet switched data network, and are carried using the method for the present invention The Real-time Data Service of confession.

Background technology

Such as Digital Subscriber Line (DSL) and/or other broadband cables connection (such as cable modem solution) Equal broadband telecommunications solution is widely used to provide to public IP connections.Asynchronous digital subscriber line as an example, it Being one kind enabling the rapid data transmission on regular copper lines (such as subscribers' line) and simulation plain old telecommunications services (POTS) The data communication technology being used together.Widely used to also have cable modem services, they are designed in cable TV Modulated data signal in infrastructure, to provide broadband the Internet access to user in the family.In addition, wireless broadband telecommunications Business is rapidly emerged in large numbers, such as Local Multipoint Distribution System (LMDS), multichannel multipoint distributed serv (MMDS), microwave are deposited Take global-intercommunication (WiMAX) and high performance radio Metropolitan Area Network (MAN) (HIPERMAN).

Most of broadband services are quick enough, to be applied not only to provide fast Internet connection, and also provide for reality When continuous data service.The example of such service be the networking telephone, online interaction formula game and for example by the remote of data network Other interactive services of journey Process flowchart (remote control of processes).Other admissible services packages Include stream video and audio.There is provided these services most of continuous flows for needing data stream transmitting between sender and recipient, with Establish includes enough data and the signal to keep the rate of quality to provide enough.Because these services are usually quick to delay height They, so in this regard meaning that data must be received soon after transmitting data, can be confirmed as in real time by sense Service.Hereinafter, such service is referred to as real time continuous data service.

Most of data communication services can be divided into four classes (such as by 3GPP in 3GPP TS23.107V3.9.0 (2002 Year September) in defined for Universal Mobile Communication System (UMTS)-" third generation cooperative partner program：Technical specification group services and it is In terms of system；Service quality (QoS) concept and architecture (revised edition 1999) " (" 3rd Generation Partnership Project；Technical Specification Group Services and System Aspects；Quality of Service(QoS)concept and architecture(Release1999))：Conversational class, steaming transfer class, interactive class and after Platform class.These classes define susceptibility of the data service to service quality.

Conversational class and steaming transfer class are mainly intended to be used for carrying real time business stream, including above-mentioned most of services.It is logical The main differentiation talked about between class and steaming transfer class is their susceptibilitys to the delay in data service.Both service class logarithms It is all sensitive according to the delay in business, but service quality rating required in the case of conversational class service by the perception of people Lai It determines.

Conversational class service includes such as networking telephone and video conference.It is primarily characterized in that, real time phone call is that having life It is executed between the reciprocity end (or group) of (people) end user of life.Real time phone call scheme is characterized in that, due to leading to for the program Talk about feature, transmission time will be relatively low, at the same with mode identical with the mode for real-time streams come keep stream information entity it Between time relationship (variation).People is given the perception of video and voice-frequency telephony by maximum traffic delay.Therefore, appreciable biography The limit of defeated delay is very harsh, unacceptable quality will be caused to lack because sufficiently low transmission delay can not be provided It falls into.

The service of steaming transfer class includes such as real-time video and/or audio.When user checks or listen to real-time video or audio When, the scheme of the real-time streams puts into practice.Real-time stream is always positioned at lived (people) final goal.This is only unidirectional Transmission, therefore be not interactive.Steaming transfer class service plan is one of emerging technology in data communication, it is in telecommunications With many new demands are all produced in data communication system.It is characterized in that, by keep stream in information entity (i.e. sample, divide Group) between time relationship (variation), but do not require any lower total transmission delay.It must be by the delay of end-to-end stream Variation is limited to keep the time relationship (variation) in stream between information entity.But it because is flowed at receiving terminal (in user equipment) Typically time alignment, thus the highest acceptable delay variation in transmission be by the time alignment function applied ability to Fixed.Compared with conversational class, therefore acceptable delay variation is far longer than the delay variation given by the limit of people's perception.

Such as when may be the end user of machine or people from remote equipment (such as server) online request data when, hand over Mutual class service plan puts into practice.The example that people interacts with remote equipment is：Web browsing, database retrieval, server access Deng.The example interacted with the machine of remote equipment is to measure the poll and automaticdata library inquiry (telematics skill of record Art (telematics)).Interaction service is that a kind of data for the request response modes being characterized as end user on the whole are logical Letter scheme.It is located in message purpose, there is the entity of (response) of it is expected to wait for the arrival of news in expected each time.Therefore roundtrip is prolonged The slow time is one of determinant attribute.Another is characterized in, by the content (and the bit error rate is low) of transmission packe in a transparent way.

When end user's (being usually computer) when sending and receiving data file from the background, background class services scheme is put to Implement.Example is that the reception of record is downloaded and measured in the backstage delivery, short message service (SMS), database of Email.From the background Class business is a kind of data communication package being generally characterized as destination expected waiting data not within some time.Therefore The program is more or less insensitive to the delivery time.Another is characterized in (thering is the content of transmission packe in a transparent way Low error rate).From above to these service classes (conversational class, steaming transfer class, interactive class and background class) definition and description it is obvious To conversational class and steaming transfer class service are characterized in that continuously end-to-end supply data.For conversational class service, It is required that it is so harsh, so that on a packet switched network, it is necessary to data packet are supplied to conversational class by their original order The user of service, and cannot have the interruption that user can be aware of.For the service of steaming transfer class, it is desirable that it is less harsh, But still have to so that packet is supplied to user by stream transmission mode and cannot have the interruption that can be aware of, and preferably sending It is supplied to user soon later.

On the other hand, interactive class and background class services may require in terms of data packet arrival time, but for even Continuous data flow and must with the stream transmission mode offer for the interruption that can not be aware of in terms of not require then.

Real time continuous data service above is summarized, these services can be divided into interactive (conversational class) service and non- Interactive (steaming transfer class) service.Interactive services require fast two-way communications and overall delay it is low and information entity reach There is only limited variations on time.Non-interactive services major requirement reaches on the time that there are limited changes in information entity Change, while being still subjected to some overall delay.Can the networking telephone and video be easily divided into two real time continuous datas Service class.Notice that interactive multi-user game is typically conversational class service, transmission requirement is determined by the perception of people.

In view of above description and for real time continuous data business, it will be appreciated that, for providing conversational class data clothes The quality of service requirement of the data connection of business is harsher than steaming transfer class data service, is similarly used for providing steaming transfer class data clothes The quality of service requirement ratio of the data connection of business is harsh for interactive data services (including multi user game).Background class services It is least sensitive to the service quality of difference.

Currently, having, the real time continuous data service of some conversational class and steaming transfer class is available, but due to internet performance The real time continuous data service (although the service quality of broadband connection is enough) of high quality can not be reliably enough provided, So these services are not widely used by the public.But answer expectable constantly improve, the real time continuous data due to performance The problem of service is used the only time by masses.

Most of data communication networks (including internet) are packet switched data networks.It will be via Packet Switch Data Network The data that network is sent are split into multiple data packets, are then communicated on network.In each network node, forward the packets to Closer to next network node of the destination of grouping.Finally, grouping reaches its destination, is located in purpose, it will The data package-restructuring received with other is to provide the data acquisition system being originally sent, such as data file.Such network Also referred to as datagram network.

In transport layer in Open Systems Interconnection (osi model), service mainly uses transmission control protocol (TCP) Or User Datagram Protocol (UDP) provides.Belong to conversational class and steaming transfer class real time continuous data service it is most common be to make It is provided with (more efficiently) udp protocol.UDP is not retransmitted or rearrangement mechanism.The grouping that will simply receive later It is considered as loss.

Specifically, for real time continuous data service, UDP is mainly used as the agreement in transport layer, with session layer with And the real-time transport protocol (RTP) in expression layer thereon is combined, using real time streaming transport protocol (RTSP) come by data flow The application being supplied in application layer.However, it is noted that with Transmission Control Protocol come replace UDP provide real time continuous data service be also possible 's.For example, multi-user's game on line may be such case.

Because UDP does not resequence or retransmission mechanism, it is possible to provide it in the higher level of osi model.In RTP In the task of RTSP, it may be possible to provide rearrangement mechanism, it is specific depending on the application.It can understand that this rearrangement mechanism is to appoint Choosing, and mechanism of resequencing may can't give any increment to the offer of some services.

In the case where transport layer is responsible for end-to-end Fault recovery and flow control, be responsible for the Route Selection of data packet is Network layer in osi model under transport layer.Therefore, in network layer, the content of data packet is transparent, and is wrapped in each packet It (is equivalent in regular postage system, package is containing address tag but wraps up containing the header for providing the details in relation to its destination Content be transparent for postman).

In data link layer in osi model under network layer, by data packet coding or it is decoded into bit.From logic angle Degree, the actual transmissions for being responsible for data are data link layers.It is physical layer under data link layer in osi model, it is OSI The lowermost layer of model, from hardware point of view, it is responsible for processing communication (multiplexing, cable etc.).Within the physical layer, data itself are complete Unrelated, because in this layer, major demands are to take electrically or optically signal to second point from first point and take in network Subsequent point.

The network of network operator's management mainly works in lower three layers of osi model：Physical layer, data link layer and net Network layers.For more complicated task, may be operated in the higher level of osi model, such as operate on the level of the transport layer.

Therefore, it for network operator (NO) and ISP (ISP), will only need to pass through internet The data of its destination received through broadband connection (such as ADSL connections or cable modem connect) are sent to, as not having There is the stream of any meaning but the data packet with destination to receive.There is each packet header, header can forward the packets to more Close to the next node of its destination, but because the content of data packet is in physical layer, data link layer, network layer or biography It is transparent in defeated layer, so underlying data service associated with data packet provides network operator or Internet service It is not known for quotient.

This brings a disadvantage to Internet service provider and network operator, that is, is difficult to the real-time continuous number in data flow According to the use of the use and any other data service (such as conventional web browsing, Email or other data services) of service Mutually distinguish.Therefore separated with any other Internet service with selectively provide with real time contiguous character (such as online it is more User plays) call and/or the service of steaming transfer class and other services become impossible.It is ordered due to broadband connection performance The user of ADSL- subscribers' lines or cable modem connection, as long as being met using necessary software and other preconditions In the case of, so that it may to use real time continuous data to service as using any other data service.Therefore, correspond to network These services are provided a user for operator respectively, and are impossible to user's charge with regard to the use of these services.

Invention content

It is an object of the invention to solve disadvantages mentioned above, and provide a kind of be used for the packet switch number with broadband connection Carry out the method that the seeervice level reached an agreement provides according to the user of network.

This purpose and other purposes are realized through the invention, wherein providing a kind of packet switch number for controlling and including data packet According to the method for the real time continuous data in stream, which is characterized in that the control of the real time continuous data includes according to using The licensing status of real time continuous data service, to retain the data packet of (retain) described packet-switched traffic with to reception User upsets the continuity of the real time continuous data when providing.

It is appreciated that retention data packet can lead to the overall delay of data packet.Therefore for real time continuous data service, It is required that data are provided with stream transmission mode, so the delay caused by retention data packet can cause to service phase with real time continuous data The interruption of associated continuous data.It, will hair if sufficient amount of coating retains and/or be retained the sufficiently long duration Raw such case.This interrupt reduces the quality of delivered real time continuous data service, to make network operator or because Te Wang providers can carry out the service offering grade reached an agreement, such as not be approved to use in the user of packet switched data network Carry out the service offering grade reached an agreement in the case of real time continuous data service.

Its actual use is set to become note that the quality of real time continuous data service is reduced to by the offer of one side methodology above Hardly possible degree ability, while on the other hand for example conventional web browsing, Email or such as file download Service quality decline is hardly this process effectively goes unnoticed by the user during non-real time data services are delivered.Specifically, can will be to service quality The most sensitive conversational class and the service of steaming transfer class and for example online multi user game of decline service impact to the service Using impossible degree is become, because the quality of (recombination) signal received is excessively poor.

For example, declining by accident or regularly to real time continuous data service introducing quality, (for example) 10-100 milliseconds Continuity interruption feel it is extremely irritating for the people for attempting to converse by network telephone service.On the other hand, under 1 second of part (belonging to background class services) period or the user's access Web site (the not interactive class service of real-time characteristic) of publishing papers The delay of order of a fraction be hardly noted and (will not be noted completely), therefore this delay is for a user not Feel irritating.Therefore the above method provides one kind and is distinguished between Non-real-time services real-time, in a stream The contents of data be not s carries out reaching an agreement in known or unrelated environment seeervice level for network provider Effective means.

According to an embodiment of the invention, the data packet is retained into a period of time, and returns it to institute after retaining State data flow.

It will be appreciated that by the returned data packet after the reservation of data packet, they will finally be received user and receive. For using Transmission Control Protocol or udp protocol being used to be incorporated in the re-transmission occurred in the higher level in osi model or rearrangement mechanism Non-real time data is sent, will be particularly advantageous.TCP includes the re-transmission sequence based on sliding window principle.If point Group is not received after its expection is received the time in certain time (along the window of expected grouping arrival time sliding) It arrives, then the request retransmission grouping.But if the grouping is delayed by, but the time slip-window after expected arrival time It is received in mouthful, then it will not request retransmission.In the case, if grouping is received later but still enough earlier than connecing Before debit's request retransmission, then request retransmission is not grouped.

On the other hand, it for real time continuous data service, retransmits typically incoherent.First, conversational class and stream Transmission class service is normally based on the UDP not including re-transmission to provide.The grouping of loss is considered only as losing.Re-transmission can be optional Ground carries out, but is not necessary.Secondly, it for real time continuous data service, does not select usually to retransmit, because in data Packet or admission control and in the case of data will being retransmitted, data packet or too late be received of data frame and cannot be carried Supply receives user.Therefore for real time continuous data service, the packet re-transmission in the case of packet loss is not executed usually, even if In higher level (more than transport layer).

If retention data packet and being not returned to data flow, for real time continuous data service, the number It is only to lose (UDP) according to packet, and for non-real time data services, then request retransmission packet (TCP), to slow down The transmission rate of data.If retention data packet, and return it to data flow after retaining certain time, then for being based on For the real time continuous data service of UDP, it is regarded as losing, therefore the service quality for still resulting in same degree declines.Separately On the one hand, for the non-real-time data based on TCP, can (such as in sliding window) (only) receive the packet in time so that weight It passes without executing.It will be appreciated that this provides the benefit in performance for the non-real-time data that is transmitted on packet switched data network. Note that even if being based on TCP in the case provides real time service, re-transmission will not still improve service quality, and it is possibly even Quality is set to deteriorate, because grouping can not in a stream be called again in the case where not introducing delay.

According to another embodiment of the invention, it includes multiple follow-up in the reservation data flow to retain the data packet Data packet.It will be appreciated that retaining the successional interruption that one group of follow-up data packet will lead to real time continuous data, even if using Buffer will interrupt to collect in the case that all data packets are supplied to reception user again later.

If not using any buffering, because only receiving data packet too late, the interruption of data continuity Appearance is apparent.But if using buffering or any other correction means and the follow-up data packet for retaining sufficient amount, The quality of real time continuous data service can be made to decline, and can not solve to connect to serve data to continuous stream transmission mode in time User is received, therefore even if using buffering or any other correction means, it is successional that the method for the present embodiment will introduce data It interrupts.

According to another embodiment of the invention, retain the data packet include one or more of retention data stream with The data packet of machine selection.

By retaining one or more data packets randomly selected from data flow, to introduce the small interruption of data flow.Such as Fruit does not use any correction means in recipient, then this by feel by noise or the continuous data received it is irritating " absolutely It is continuous ".It is associated with real time continuous data service if having used any correction means such as buffering in recipient Certain time can be postponed by receiving data, until receiving required packet or until these packets are considered as loss by correction means and are provided The data for the packet being not received by.If the data packet of sufficient amount retained enough for a long time, in all cases, this all will Irritating service quality is caused to decline.

Be embodied as real time continuous data service introducing service quality decline using the embodiment of the present invention one is alternative Mode, wherein real time continuous data include the data packet of a sequence, and the data packet of data flow is retained with data rearrangement The sequence of packet.

Here to make sure to keep in mind, all data packets in data flow are carried out according to retention data packet of the present invention, regardless of this A little data packets are associated or associated with non-real time data services with real time continuous data service.If retained Data packet include the data packet of data sequence, then by one or more data packets of retention data stream, to upset the data The former order of data packet in sequence.If be modified not to this in recipient, this will equally feel to be noise or data " intermittent ".But if be corrected in recipient, this can lead to the delay that data provide, so as to cause data Successional interruption.In other words, it can not be served data to continuous stream transmission mode and receive user.Non-real-time data is taken For business, it is recoverable that the order of packet is received when receiving, therefore for non-real time data services, according to the present invention The method of this embodiment will irritating the service quality that can be aware of will not be caused to decline.

According to the modification of above-described embodiment, the data packet that data packet or each group to each reservation retain uses different guarantors The time is stayed to retain and return it to data flow.

This will provide a kind of effective ways of all data in data rearrangement stream.Such as and according to another embodiment, The length of retention time can be determining at random.

According to a further embodiment of the invention, packet-switched traffic is outbound (outbound) from data source Data flow, and according to still a further embodiment, packet-switched traffic is destined for the inbound of data sink (inbound) data flow.Any of which can be selected to apply or apply them in a joint manner.

It will be appreciated that the two embodiments provide the benefit of the method using the present invention, because can be to being sent to user's The service level enforcement reached an agreement is realized into business and to the outgoing traffic of the user from packet switched data network.

According to another embodiment of the invention, this method further includes after receiving user and receiving data packet by data The step of package-restructuring.As discussing to a certain degree, the method for the present invention will not be overcome using correction means in recipient above The service quality of offer declines, and the quality that in most cases can even increase its service declines.It is noted that, for example when using When buffering comes time-critical or real time continuous data that corrected received arrives, the case where any amendment is not carried out compared with recipient, This may cause the bigger of data continuity to be interrupted when providing.This is because buffer will retain all follow-up datas until connecing Until the data for receiving loss, or if not receiving it, delay is just provided after waiting for the data lost to be received Data.

According to the modification of above-described embodiment, the step of recombination includes the data packet that buffering is received and discussed above.

It is changed at one according to above-described embodiment, the step of recombination further includes resetting the original being originally sent used in data packet The received data packet of order.

Although the method for the present invention can execute on any desired layer of Open Systems Interconnection (osi model), It is according to embodiments of the present invention, including data link layer, network layer or transport layer preferably in packet switched data network One group of layer any layer in execute the present invention method.It will be appreciated that in these layers, the data in data flow are for network Topology is transparent, and the structure only in its data packet form is visible.

It is had the benefit that in a data link layer using the present invention：The present invention is executed on low layer in a network, and The present invention can be applied under conditions of being not necessarily to analysis completely or explaining packet.It can be relatively easy to achieve this hair in the case Bright method, and the method that can quickly execute the present invention,

Have using the present invention in network layer has the available benefit of routing information in this layer.Therefore, it can be based on Its destination or source selectively retain packet.

In transport layer following benefit is provided using the present invention：Can selectively retain using certain agreement (UDP or TCP) packet of transmission or selectively packet of the reservation with specific TCP/UDP port numbers.By reservation with certain port number Packet, can position special services associated with the port.

According to another embodiment of the invention, it is swum using real time continuous data to provide such as phone or streaming multi-user The real time continuous data service of play.

According to another embodiment of the invention, the mandate shape serviced according to the use described above real time continuous data State retains the data to execute.This will make the execution of the method for the present invention according to the seeervice level for example reached an agreement or suitable for using Any other standard at family carries out.Note that opposite this method can be also used for the real time continuous data service to all users Use carry out comprehensively, intentionally prevent.

According to the modification of above-described embodiment, the mark data that the user by assessing real time continuous data service provides is come really Determine licensing status.

It will be appreciated that executable mark sequence or the similar manner for authorizing the access right to real time continuous data service And licensing status is determined by the result of mark sequence.User can be required to input username and password, such as he is to have for confirmation Qualification uses the username and password of the user of these real time continuous datas.

Assessment result based on mark data can allow the service for carrying out real time continuous data service to the user to hand over temporarily It pays.

According to another embodiment of the invention, as a whole to data flow enrolled for service grade, and by the seeervice level of registration To determine licensing status.It will be appreciated that for example can to from it is known he/her be not approved using real time continuous data service certain All data of a user execute this method.Such as it can be all to what is transmitted in broadband connection or ADSL connections that user uses Data execute retention data packet.

According to another embodiment, carry out transmitting packet switched data stream using the subscribers' line of telecommunication network.Utilize user Circuit, licensing status determine by predetermined state, and can with or may thus register licensing status.Subscribers' line solution Can include at least it is following in any one：Digital Subscriber Line (DSL) (such as asynchronous digital subscriber line (ADSL), synchronous digital are used Family line (SDSL), rate adaptive digital subscriber line (RADSL), high bitrate digital subscriber line (HDSL) or high bit rate number Word user line (VDSL)), cable modem solution, satellite Internet, frame relay, Gigabit Ethernet, Ren Hewu Line broadband subscriber solution (such as it is Local Multipoint Distribution System (LMDS), multichannel multipoint distributed serv (MMDS), micro- Wave access global-intercommunication (WiMAX) and high performance radio Metropolitan Area Network (MAN) (HIPERMAN)) or the solution of other broadband user's circuits Scheme.

According to another embodiment of the invention, real time continuous data service includes at least one of one group of service, Phone, streaming multi-user game, stream video and stream audio of the group service including such as networking telephone.Note that according to the present invention The purposes of method be not limited to these services.

According to the second aspect of the invention, a kind of real time continuous data in control packet switched traffic is provided System, wherein the packet-switched traffic includes data packet, the system comprises for intercepting and forwarding the data flow Component, which is characterized in that the system also includes for according to use the licensing status of real time continuous data service to retain The data packet of packet-switched traffic is stated to upset the continuous of the real time continuous data after providing it to reception user The component of property.

The embodiment of this second aspect of the present invention defined in dependent claims 23-32.

Note that according to the preferred embodiment of the present invention, which includes the component of the licensing status for determining user.According to An alternative embodiment of the invention, these are for determining that the component of licensing status may include for receiving licensing status from external source Component.But these are used to determine the mark data that the component of licensing status may also include for receiving and assessing user's offer Component.

According to a third aspect of the present invention, the present invention relates to the use of above system in packet switched data network, the systems For controlling the real time continuous data business for providing real time continuous data service in the network.According to embodiment in this respect, The system can be set to control be sent to receiver inbound, from the outbound of transmitter or be sent to or from transceiver two types The real time continuous data business of type.

The service provided according to use defined above may include phone, streaming multi-user game, stream video or stream audio Or any other real time continuous data service.

According to the fourth embodiment of the invention, the present invention relates to a kind of real time continuous data service, such as phone, streaming are more User's game, stream video or stream audio, wherein the service is provided using method as defined above, wherein real-time continuous number It is provided using real time continuous data defined above according to service.

Referring now to the preferred embodiment of the present invention by description and attached drawing come the present invention is furture elucidated.But this hair Bright to be not limited to the disclosed embodiments, these embodiments are only to provide for explanatory purposes.It is wanted in appended right Protection scope of the present invention is explicitly defined in asking.

Description of the drawings

Fig. 1 is the diagram of packet switched data network, and reality according to the present invention has been used in the packet switched data network When continuous data service disabler (disabler).

Fig. 2 shows the business delivery modes of the packet of a sequence by packet switched network transmission.

Fig. 3 shows to transmit the business delivery mode of the data packet of a sequence, the grouping on packet switched data network Switched data network includes real time contiguous data service disabler according to the present invention.

Fig. 4 A and 4B are the signals of two alternative embodiments of the present invention realized in cable modem solution Figure.

Specific implementation mode

In Fig. 1, multiple users use multiple data sources or transmission part (such as the IP 6 of user I and individual Computer 5, user II personal computer 7 and user III personal computer 8) be connected to packet switched data network 1.Point Group switched data network is schematically shown by cloud form frame 1 and the network node of multiple interconnection 2.Each user I, II are connected with III One of node 2 to packet switched data network 1 node.Packet switched data network 1 may include such as internet. A variety of data services can be accessed on the ustomer premises access equipment 5,6,7 and 8 of user I, II and III by packet switched data network 1. These data services may include that Email, web browsing, file transmission and real time continuous data service (such as the networking telephone, regard Frequency meeting, interactive multiplayer's game, DTV, the Internet radio, stream audio and stream video).

It can also carry out broadcast digital TV program using the server 20 for being connected to packet switched data network 1.This number Television broadcasting can be received potentially by any user for example, by personal computer 5,7 and 8.Another possibility is to use it The user I of digital internet telephone 6, which wishes to establish via its personal computer 8 and user III, to be called.

In the packet switched data network that Fig. 1 is schematically shown, each of user I, II and III (wherein) pass through root It is connected to the network according to the system (hereinafter referred to as real time contiguous data service disabler) of the present invention.Such as user I is connected to It is connected to the service disabler 10 of network node 2.Equally, user II and III is connected to net by service disabler 12 and 14 respectively Network node 2.Can by central control server 17 come control real time contiguous data service disabler 10,12 and 14 each, Wherein network operator or ISP have central control server 17 complete control as shown in figure 18.

It is assumed that user I connects (such as Digital Subscriber Line connects (DSL)) by broadband connection arrives packet switched data network, Wherein the broadband connection has the reservation for corresponding to the highest seeervice level that ISP provides.Therefore user I is not only It is approved to use the regular data services such as web browsing, Email, but also is approved to use such as networking telephone or video council The real time continuous data service of view.Furthermore, it is assumed that user III is also by DSL subscriber's connection to the Packet Switch Data Network Network, and there is reservation identical with user I.Meanwhile user II is connect also by broadband connection with packet switched data network, but It is since he is only interested in Email and web browsing, so only having the reservation of the lowest service grade corresponded to available.

In the case where giving above-mentioned reservation, network operator or ISP can be by controlling server 17 Correspondingly each real time contiguous data service disabler is programmed.Network operator can be for example by closing service disabler 10 and 14 so that all services available for users I and III are used.Meanwhile network operator can be to service by controlling server 17 Disabler 12 programs not allow any real time continuous data service.

If user I wishes to establish IP telephone call with his IP and user III, his voice It is converted into the data packet of the sequence originated from IP 6, the data packet of the sequence is comprised in the service of being dealt into and prohibits In data flow with device 10.Because service disabler 10 is closed, data flow is forwarded to network node without modification 2, stream compression is dealt into the personal computer 8 of user III from network node 2.In the way for being sent to personal computer 8, due to Service disabler 14 is also turned off, so service disabler 14 ignores the data packet for the sequence for being sent to user III.It will be to user III notifies the incoming call of user I also, user III answers the incoming call.Call occurs.

For user II, service disabler 12 is arranged under the service quality for making to enter data service and outgoing data traffic The degree of drop causes any real time continuous data service unavailable.If user II wishes to establish net with user I or user III The data of one sequence of the voice made a speech corresponding to user II are then forwarded a packet to service disabler 12 by network call, but Be service disabler 12 retains the sufficiently long time by sufficiently large data packet, in recipient (such as user I or user III the interruption of continuous data signal) is regularly introduced, and can not be using common correction means come the case where not interrupting It is lower to correct it.Vice versa, and the real time continuous data that user II is received services similarly by the influence of service disabler 12. Meanwhile user II can not receive the TV Festival of 20 broadcast of service in the case where not generating unacceptable service quality and declining Mesh.

It is assumed that user I accesses user II, while when using ustomer premises access equipment (personal computer 7) of user II, user I and User II wishes to establish Internet phone call with user III.As described above, service disabler 12 is by network operator or because of spy Net service provider is configured to any real time continuous data service for using and the broadband connection of packet switched data network Personal computer 7 is all impossible.It is noted that control server 17 is connected to packet switched data network.Temporarily by clothes Service disabler 12 to personal computer 7 provide real time continuous data service be it is possible, will be described.

In order to establish Internet phone call with personal computer 7, user I is for example connected by accessing Web site To control server 17, him is verified using identification procedure in controlling server 17.User I can input his user name and close Code, during evaluation process, control server 17 checks that this user name and corresponding password whether there is, and according to this inspection As a result, being connected to database 19, database 19 includes to be connected to Packet Switch Data Network by above-mentioned ISP All connection details of all users of network.Network comtrol server determines that user I is approved on the basis of his reservation clause Use IP.In response, control server 17 now temporarily switches off service disabler 12, uses personal computer 7 User I and II can establish Internet phone call with user III now.Once Internet phone call terminate, then because Spy net service provider can re-establish the former seeervice level that user II is approved.

It is assumed that because no longer interested in the reception networking telephone, user III changes his broadband subscription now.Because he is not Wish to miss favorite stream video in internet TV program weekly, so it is switched to the relatively low seeervice level for enabling stream video, but It is without any conversational class continuous data service (such as video conference or networking telephone).Network operator (NO) or Internet service Provider (ISP) will open service disabler 14 now, and be configured to make the random sequence data point in outgoing data stream Group postpones randomly selected a period of time.

It is assumed that user I now desires to establish conference call with user III.But now with his personal computer 5, Loudspeaker (not shown) and Web camera (not shown)s, the voice and image of user I will be converted into a sequence Data packet, the data of the sequence are then forwarded a packet into service disabler 10.Service disabler 10 is closed, the number of the sequence It is forwarded to network node 2 according to coating, forwards it to the service disabler 14 in the broadband connection of user III again from there. Service disabler 14 is ignored into business, therefore the data-signal of user I is unmodifiedly sent to the individual calculus of user III Machine 8.

Next, when being responded to being talked about made by user I, the data flow of the voice and image of carrying user III Personal computer 8 is left, and is intercepted by service disabler 14.Service disabler 14 accidentally but regularly retain from Data packet in the data flow of personal computer 8.User I receives regularly lost data packets on his personal computer 6 Data flow.Because of the high standard of quality of service requirement needed for video conference, the Service Quality that service disabler 14 introduces The continuity that amount declines the data for causing user I to be received at personal computer 6 is interrupted.Caused service quality, which declines, to be made Even if using the correction means of such as buffering, the continuity of data is still regularly interrupted, between user I and user III Call is really impossible.User III can not use video conference, and the networking telephone can not be also used due to identical.

It again assumes that soon after, user III changes his reservation again, because he wants to broadcast streaming video.ISP Service disabler 14 can be configured to accidentally but regularly retain total one or more of outgoing data stream Data packet.This make it is quality-degraded so that its use is become impossible degree to conversational class service will be influenced, but spread The service quality of defeated class service is still enough to use these services.

If user III attempts to carry out calling party I using his computer 8 now, service disabler 14 intercepts outgoing Data service.Network operator opens service disabler 14, and has been configured to for example accidentally but regularly One or more of total outgoing data stream data packet is retained by service disabler 14.This reservation will inevitably impact on by with The packet that the data packet for the sequence that family III is originated is constituted.After retaining certain time, these data are forwarded a packet to Network node 2 transfers it to the IP 6 of user I in network node 2.IP 6 may include for example with In the element of buffering received data packet.After buffering certain time, by its former sequence order by these data package-restructurings, Can be supplied to user I, and user I will feel that the data are the voices from user III, but by very disruptive Or always " intermittent ".Regular conversation is impossible, and call will terminate quickly.Pay attention in order to correct and recombinate this The quantity of a little data packets, the data packet to be retained must be sufficiently small or must only shortly retain these data packets, of short duration to foot So that overall delay is not taken care or does not feel to be irritating for user I during the Internet telephone calls.If preferably Ground is configured with service disabler 14, by the sufficient amount of enough long-times of outgoing packetization delay, the notable of voice signal will occurs " scrambling (scrambling) ".

Stream video is influenced by same degree, but because small overall delay can be restored for these services, Buffering can be used in conjunction with recovery process to rebuild correct data sequence order.

It will be appreciated that for the user for using ADSL connections, it can be in all data of the interception from the user With the application of the invention, this is in node 2 or near node 2 in Fig. 1 at first network node.Although being expressed as network in Fig. 1 In individual component, but in the case of such as DSL connections, service disabler 10,12 and 14 can be collected with network node 2 At.

It is described in conjunction with embodiment combination Digital Subscriber Line (DSL) solution that Fig. 1 is described, in this solution In each user using being individually connected to network node 2.When applying the present invention to such as cable modem Complexity can rise when solution, and for cable modem solution, multiple users are total in home loop It enjoys to a connection of network node.This situation is illustrated in Fig. 4 A and 4B, and this will be described by below.

For come in conjunction with cable modem solution with the application of the invention, it will be appreciated that each user 52 of Fig. 4 A, 53,54 network node 65 is connected to by connection 50 shared each other.For example, live adjacent to each other (such as live in same A street) multiple users 52,53,54 can respectively using cable modem 56,57 and 58 pass through one connection 50 come even It is connected to network node 65.Network node 65 by connection 68 with the wide area network (WAN) of other node (not shown)s by being connect It constitutes.Each user 52,53 and 54 is connected to shared connection 50 by special connection 60,61 and 62 respectively.

Simply retain the data packet in the data flow being included in shared network connection 50 (such as above in association with Fig. 1 institutes The description for the embodiment shown) each user for being connected to network connection 50 can be influenced, therefore be unsuitable for the relevant strategy of user and push away Row or service provide.For cable modem solution, multiple choices are possible.On data link level, can lead to The media access control address (MAC) is crossed to identify each cable modem (56,57,58).Therefore include being originated by it Or destination MAC Address is being possible the step of identifying data packet.Once it is to belong to some MAC Address by identification of data packets, Destination user or originating user are exactly known, and can retain the data packet with the MAC Address label of the user without influencing The data packet of other users.In Figure 4 A, this can be executed by service disabler 69, which executes data link The step of MAC Address detection of each data packet in layer.Once identifying the data packet to be retained, then service disabler 69 will Execute the suitable retaining method as described in the service disabler 10,12 and 14 above in association with Fig. 1.

Second of solution is shown in Fig. 4 B, wherein not making an amendment and/or working in a manner of identical with Fig. 4 A Diagram embodiment in all elements use identical reference numeral.Difference between Fig. 4 A and Fig. 4 B be user 52,53 and 54 use special cable modem 72,73 and 74 respectively.It can be by network operator or ISP for example It is programmed with the remote mode cable modem 72,73 and 74 special to these using control unit 70.Specially by these Service disabling or the data packet reservation that the cable modem 72,73 and 74 of door executes, which may include for example retaining, to be sent to or originates In the inbound or outbound data packet of associated user.The programming of these cable modems uses service disabler, such as schemes The service disabler 69 of 4A.

Fig. 2 shows the groupings of the data packet of a sequence of the packet switching network delivery for example, by internet to deliver mould Formula.The data packet of the sequence originates from grouping source 21, they are sent to from there on internet 22, when the side of being received receives When, buffer or correcting part 23 recombinate the data packet received, and place them in their former sequence order.This Afterwards, user shown in grouping receiver (packet sink) 24 is provided data to.In fig. 2, at various locations in A, B and C The business model of grouping is analyzed, this corresponds to provides data packet (position A), the sequence to the sequence of internet 22 by being grouped source 21 Row propagate through the identical sequence (position B) received by buffer 23 after internet 22, and by correcting part or buffer The identical sequence (position C) of the user shown in grouping receiver 24 is provided.

The grouping that receiver provides a sequence according to following order at regular time intervals is grouped shown in A：P1、 P2、P3、P4、....In the case of the characteristic of the packet switched data network of given such as internet, mutually homotactic difference Data packet can travel to another position by different network nodes from a position, and the time-sequencing of these data packets can quilt It upsets to a certain degree.In general, the Internet channel between the first and second positions can be statistically characterized.Just it is grouped in The minimum propagation duration of stroke mark and maximum propagation duration in the Internet channel is typically possible.In fig. 2, earliest one " direct " (or in very of short duration time) is received after sending for grouping, such as is grouped P1.The double-head arrow 27 of 34 top of axis Indicate minimum duration.Statistically, some data packets have maximum propagation duration, such as 29 registrations of double-head arrow in 35 upper right side of axis Shown in propagation duration according to packet P2 in-position B.In the case of these characteristics of given the Internet channel, receiver is come The grouping by buffering certain segment data shown in such as figure double-head arrow 31 is said to correct the data packet of the sequence and obtains constant production Extracting rate is possible.Hereafter, as shown in the C of position, these groupings are supplied to by user with the stream transmission mode of rule, only have compared with Small delay.If the duration of buffering is sufficiently small, the reception user in packet switch 24 will be difficult to be aware of the delay, and It will feel that provided data are such as voices.In figure 3 it is shown that almost real-time performance identical with Fig. 2, but in figure 3 It is carried out using by the real time contiguous data service disabler 40 under the connection between grouping source 21 and internet 22.Pay attention to Fig. 3 institutes The alike-functioning parts shown are indicated using reference numeral identical with the reference numeral in Fig. 2.On axis 42, grouping source 21 is shown The data packet of the sequence provided, such as data packet 25.Service disabler 40 can retain the data packet of each transmission, and will be each Grouping retains different durations, until when again returning to data flow.As a result, because such as package number P4 will be retained The time short more than data packet P1, so the former order of the sequence is upset by service disabler 40 completely.In addition this is increased By being upset caused by internet 22, and generate package receipt pattern shown in the position B on axis 43.If buffer 23 is wanted The data packet received is disposed in a suitable manner, then must be introduced into very long delay, as indicated by double arrow 45.This length is prolonged It can be experienced by the receiving user the interruption for data continuity late, and because these interruptions regularly occur, with Feel that it is irritating in family.Therefore for the viewpoint of practice, it is difficult with the real time continuous data service for a user. Therefore the access of absolute service can effectively be refused.It is in particular noted that the delay that service disabler 40 introduces each packet It is the result of the random offset of the grouping applied to all entrance.It can be by each packet offsets, such as -3, -2, -1,0,1,2 Or 3 positions, thus destroy the former order of the grouping in data flow.

Because the data packet of the sequence indicates voice, by these buffering of packets and their former order weight must be pressed Group.This causes to postpone shown in double-head arrow 45.It is in particular noted that being constituted if corresponding to the data packet that position A is indicated on axis 42 Web page, then it will not it is real to first deliver which data packet and after to deliver which data packet related.The different portions of Web page Dividing can start to load independently of the other parts of the Web page, and rearranging for data packet will not or can not possibly be perceived as angry People's.

For for example downloading file, similar result is had.Introduced due to reorganizing packets when receiving file compared with The user that small delay will not be downloaded this document feels to be irritating, because without providing this article in a manner of continuous steaming transfer Part.Without any problem the data packet that evening receives can be inserted between the data packet having received.Once having downloaded text Part, it there is and this, and for voice, successional interruption leads to the interruption of call, to make call become extremely difficult Or it can not possibly even carry out.

Paying attention to should if executed to the business based on the Transmission Control Protocol (transmission control protocol --- TCP) with sliding window Method, then handling capacity will reduce, this is equivalent to the retardation of introducing.Because it is expected that real-time protocol (RTP) (voice, video) will be more next UDP (User Datagram Protocol --- UDP) more based on not sliding window, institute with the inventive method will be for being based on The service of UDP is especially effective, because after not receiving data packet, will directly cause the interruption of transmission.Pay attention to UDP to Service Quality The dependence of amount is far above TCP.

For the purpose of understanding, it has to be noted here that according to above-mentioned principle a large amount of modifications and changes can be carried out to the present invention. It is therefore understood that within the scope of the appended claims, the non-mode specially described above may be used to implement in the present invention.

Claims (39)

1. a kind of method of the real time continuous data in packet-switched traffic of the control comprising data packet, which is characterized in that institute The control for stating real time continuous data includes retaining the grouping according to the licensing status of real time continuous data service is used The data packet of switched traffic, to upset the real time continuous data when providing the real time continuous data to reception user Continuity, wherein the reservation is carried out to the data packet in the data flow, regardless of these data packets are and real-time continuous number It is associated or associated with non-real time data services according to servicing.

2. the data packet is the method for claim 1, wherein retained a period of time, and will after the reservation It returns to the data flow.

3. method as claimed in claim 1 or 2, wherein it includes multiple in the reservation data flow to retain the data packet Follow-up data packet.

4. method as claimed in claim 1 or 2, wherein retain the data packet include retain one of the data flow or Multiple randomly selected data packets.

5. method as claimed in claim 1 or 2, wherein the real time continuous data includes the data packet of a sequence, and The data packet of the data flow is retained to reset the data packet of the sequence.

6. method as claimed in claim 5, wherein the data packet that data packet or each group for each reservation retain uses Different retention times retains the data packet and returns it to the data flow.

7. method as claimed in claim 5, wherein the time span of the reservation is determining at random.

8. method as claimed in claim 1 or 2, wherein the packet-switched traffic is from the outbound of data source Data flow.

9. method as claimed in claim 1 or 2, wherein the packet-switched traffic is destined for the inbound of data sink Data flow.

10. method as claimed in claim 1 or 2 further includes after the reception user receives the data packet by institute The step of stating data package-restructuring.

11. method as claimed in claim 10, wherein the step of executing the recombination on a layer in one group of layer, institute It includes transport layer, session layer, expression layer or application layer to state one group of layer.

12. method as claimed in claim 10, wherein the step of recombination includes the data packet that buffering receives.

13. method as claimed in claim 10, wherein the step of recombination further includes by being originally sent the data packet institute The former order used is come the step of resetting the data packet received.

14. method as claimed in claim 1 or 2, wherein in packet switched data network, include in one group of layer one The reservation of data packet is executed on a layer, one group of layer includes data link layer, network layer and transport layer.

15. method as claimed in claim 1 or 2, wherein the real time continuous data is for providing the real time continuous data Service.

16. method as claimed in claim 15, wherein the real time continuous data service includes phone or streaming multi-user trip Play.

17. method as claimed in claim 1 or 2, wherein what the user by assessing the real time continuous data service provided Mark data establishes the licensing status.

18. method as claimed in claim 1 or 2, wherein be the data flow enrolled for service grade and the licensing status It is determined by the seeervice level of the registration.

19. method as claimed in claim 1 or 2, wherein the packet-switched traffic is on the subscribers' line of telecommunication network Transmission.

20. method as claimed in claim 19, wherein the licensing status is determined by the reservation status of the subscribers' line.

21. method as claimed in claim 19, wherein the subscribers' line be include in following group at least one It is a：Digital Subscriber Line（DSL）；Cable modem solution；Satellite Internet；Frame relay；Gigabit Ethernet；Or appoint What wireless broadband subscriber solution.

22. method as claimed in claim 21, wherein the Digital Subscriber Line（DSL）Including asymmetric digital subscriber line （ADSL）, symmetric digital subscriber line（SDSL）, rate adaptive digital subscriber line（RADSL）, high bitrate digital subscriber line （HDSL）Or pole high bitrate digital subscriber line（VDSL）；And the wireless broadband subscriber solution includes local multiple spot point With business（LMDS）, multichannel multipoint distributed serv（MMDS）, micro-wave access global inter communication（WiMAX）And high performance radio Metropolitan Area Network (MAN)（HIPERMAN）.

23. method as claimed in claim 15, wherein the real time continuous data service includes at least one in one group of service A, one group of service includes phone, streaming multi-user game, stream video, stream audio.

24. a kind of system for the real time continuous data in control packet switched traffic, wherein the packet switched data Stream includes data packet, and the system comprises the components for intercepting and forwarding the data flow, which is characterized in that the system is also Including, for according to use the licensing status of real time continuous data service retain the data packet of the packet-switched traffic with The successional component of the real time continuous data is upset after the real time continuous data to be supplied to reception user, In, the reservation is carried out to the data packet in the data flow, regardless of these data packets are to service phase with real time continuous data It is associated or associated with non-real time data services.

25. system as claimed in claim 24, wherein the component for retaining the data packet is arranged to the number Retain a period of time according to packet, the system also includes the components that the data packet for that will postpone returns to the data flow.

26. system as claimed in claim 25, wherein the component for retaining the data packet is arranged to using difference Retention time retain each data packet or each group of data packet.

27. system as claimed in claim 26, wherein the component of the data packet for postponing the reservation is arranged to pair The data packet that the data packet or each group of each reservation retain uses the retention time of random duration.

28. the system as described in any one of claim 24 to 27, wherein the component for retention data packet is arranged to Retain multiple follow-up data packets.

29. the system as described in any one of claim 24 to 27, wherein

The component for retention data packet is also configured to randomly retain one or more data packets.

30. the system as described in any one of claim 24 to 27, wherein the real time continuous data service with it is described in real time Continuous data is associated.

31. the system as described in any one of claim 24 to 27 further includes the component for determining the licensing status.

32. system as claimed in claim 31, wherein it is described for determining that the component of the licensing status includes, for from External source receives the component of the licensing status.

33. system as claimed in claim 31, wherein described for determining that the component of the licensing status includes for receiving The component of the mark data provided with assessment user.

34. system as claimed in claim 31, wherein described to be for determining that the component of the licensing status is arranged to basis The seeervice level of the stream data definition determines the licensing status.

35. a kind of packet switched data network is using as described in any one of claim 24 to 34 in the network System, to control the real time continuous data business in the network for providing real time continuous data service.

36. packet switched data network as claimed in claim 35, wherein the system is arranged to control and emits from data The outbound real time continuous data business of device.

37. the packet switched data network as described in claim 35 or 36, wherein the system is arranged to control and is sent to data The inbound real time continuous data business of receiver.

38. the packet switched data network as described in claim 35 or 36, wherein the system is for providing real-time continuous number According to service.

39. packet switched data network as claimed in claim 38, wherein the real time continuous data service includes phone, stream Formula multi user game, stream video or stream audio.