CN100366027C - Method for realizing frame reliable transmission in frame relay network - Google Patents

Method for realizing frame reliable transmission in frame relay network Download PDF

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Publication number
CN100366027C
CN100366027C CNB031576915A CN03157691A CN100366027C CN 100366027 C CN100366027 C CN 100366027C CN B031576915 A CNB031576915 A CN B031576915A CN 03157691 A CN03157691 A CN 03157691A CN 100366027 C CN100366027 C CN 100366027C
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China
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frame
transmission
transmission frame
definition
qos
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CNB031576915A
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Chinese (zh)
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CN1578256A (en
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袁星卫
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华为技术有限公司
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Abstract

The present invention relates to a method for realizing frame reliable transmission in frame relay networks, which comprises the following steps of defining quality of service (QOS) provided for a transmission frame in the expandable field of an FRF. 11 standard frame format; providing the transmission frame provided with QOS with corresponding service when the transmission frame of the FRF. 11 standard format is transmitted in a frame relay network according to the requirement of definition. Therefore, the present invention solves the problem that a VORF(a voice on a frame relay) technique caused on an FRF. standard can not guarantee the QOS in the process of frame transmission and lays the foundation for providing rich QOS measures during voice transmission on the frame relay network.

Description

The method of transmission frame reliable transmission in the achieve frame junction network

Technical field

The present invention relates to network communications technology field, relate in particular to the method for transmission frame reliable transmission in a kind of achieve frame junction network.

Background technology

In the early 1990s the phase, unique support voice transmission manner adopts circuit-switched technology exactly, and comprises that grouping such as frame relay switching technology is only as the solution of transfer of data.And the speech network of most of enterprises and data network separate, shared bandwidth not between the two.

Yet along with the development of the network communications technology, the mode of voice transfer also begins to adopt packet-switch technology gradually owing to improve the promotion of the chance of P/C ratio at present, and the unification of speech network and data network becomes trend of the times.Statistics shows had a large amount of voice messagings to embed data network, and the transmission of support voice also is Virtual network operator and user's hope more economically.

For these reasons, just produced VOFR (voice on the frame relay) technology, FRF.11 (Frame Relay Forum) is the standard of VOFR just, be that the FRF.11 standard is the basis of VOFR, this standard definition upload the form of sending voice data at frame-relay network, as shown in Figure 1, in the definition of frame format, a Payload Type (PT Payload Type) field is arranged, and this field is 4 positions, and the FRF.11 standard is defined as follows this field:

When 4 positions of this field were " 0 ", what represent to carry in the transmission frame of this FRF.11 standard code was basic load;

When 4 positions of this field are " 0001 ", the digital keys of the FRF.11 appendix A definition of representing to carry in the transmission frame of this FRF.11 standard code;

When 4 positions of this field are " 0010 ", the signaling of the FRF.11 appendix B definition of representing to carry in the transmission frame of this FRF.11 standard code;

When 4 positions of this field are " 0011 ", the facsimile data of the FRF.11 appendix C definition of representing to carry in the transmission frame of this FRF.11 standard code;

When 4 positions of this field were " 0100 ", what represent to carry in the transmission frame of this FRF.11 standard code was quiet data.

In the FRF.11 standard, described basic load load comprises three kinds: digital speech, digital fax, general data.By the definition of above-mentioned Payload the type field as can be seen, in transmission course, in transmission frame, respectively these three kinds of basic loads are not defined, yet, in the actual transmissions process, promptly in actual application, real-time to these three kinds of basic loads requires but to have nothing in common with each other, for example, speech data is a kind of real time data, all very responsive to the processing delay of each node in the network, and the delay that is brought when not having a kind of measured mechanism to guarantee transferring voice in the frame relay technology.

Therefore, VORF technology on frame-relay network lacks the means that voice quality guarantees.Be in the existing FRF.11 standard in the formal definition to transmission frame, there is not TOS (the Type of Service in the IP packet of VOIP (voice on the IP), COS) territory, greatly restricted QOS (service quality) characteristic that on frame-relay network, provides abundant, described QOS mainly is by distinguishing different data flow, being embodied as different data flow provides different priority to guarantee, the foundation of difference various flows has usually: TOS territory, IP source address, IP destination address, source port number, destination slogan.And at frame-relay network, not with IP network on corresponding QOS queue technology, so corresponding QOS assurance can't be provided the data of transmitting on the frame relay.

Summary of the invention

In view of above-mentioned existing in prior technology problem, the purpose of this invention is to provide the method for transmission frame reliable transmission in a kind of achieve frame junction network, thereby make when in frame-relay network, transmitting voice or data, the more QOS function of horn of plenty can be provided.

The purpose of the invention described above realizes by following scheme:

The method of transmission frame reliable transmission in described a kind of achieve frame junction network comprises:

But a, in the extended field of the frame format of FRF.11 standard, the QOS (service quality) that definition need provide for transmission frame;

B, when the transmission frame of described FRF.11 reference format transmits in frame-relay network, according to the definition needs provide corresponding transmission service for its QOS that provides for this transmission frame.

Described step a is: in Payload Type (PT Payload Type) field of the frame format of FRF.11 standard, and the QOS that definition need provide for transmission frame.

The QOS that described definition need provide for transmission frame is: the QOS of the COS definition transmission frame that load type by definition transmission frame carrying or definition need provide for transmission frame.

The load type of described definition transmission frame carrying comprises: the digital speech basic load, digital fax basic load or the general data basic load that define the transmission frame carrying respectively.

Described step b comprises:

The transmission frame of FRF.11 reference format transmits in frame-relay network;

Resolve the field of definition bearing load type in the transmission frame, determine the load type of transmission frame carrying;

Its QOS that provides is provided needs when determining the conducting frame transmission according to the load type of transmission frame carrying.

Described definition need comprise for the COS that transmission frame provides: definition minimum delay that need provide for transmission frame, maximum throughput, high reliability and least cost respectively.

Described step b comprises:

The transmission frame of FRF.11 reference format transmits in frame-relay network;

Resolve the type of service field in the transmission frame, the COS that need provide for transmission frame is provided;

Its QOS that provides was provided needs when the COS that provides for transmission frame according to the needs that parse was determined the conducting frame transmission.

Described parsing transmission frame is: on router or frame relay switch transmission frame is resolved.

By technical scheme that the invention described above provided as can be seen, the present invention is by the Payload the type field in the spread F RF.11 standard transmission frame format, the load type and the COS of transmission frame carrying in the definition frame junction network, make when in frame-relay network, transmitting voice or data, the more QOS function of horn of plenty can be provided, as when defining transmission frame and being the digital speech basic load, when network congestion, then will adopt higher priority to send to it.Therefore, the VORF technology based on the FRF.11 standard of the invention solves can't be the voice of transmission or data according to corresponding needs, adopt the QOS queue technology that the problem of reliable transmission service quality is provided.

Description of drawings

Fig. 1 is the transmission frame format schematic diagram of FRF.11 standard;

Fig. 2 is the form schematic diagram of IP bag;

Load type and the service type list of Fig. 3 for defining among the present invention;

Fig. 4 is the specific embodiment of the present invention flow chart.

Embodiment

The purpose of the method for transmission frame reliable transmission is on the basis of FRF.11 standard in the achieve frame junction network of the present invention, expand existing field, for on frame-relay network, providing the QOS characteristic that the basis is provided, and then the corresponding QOS that provides for transmission frame as required in the frame-relay network is provided carries out the transmission of transmission frame, satisfy the transmission demand of various users' various types of data.

The transmission frame format of FRF.11 standard code has had description in background technology, promptly in transmission frame, respectively these three kinds of basic loads are not defined, if these three kinds of basic loads need not it is treated with a certain discrimination in transmission course, and adopt different transmission QOS, this regulation of that FRF.11 standard should be no problem, yet, in the actual transmissions process, real-time to these three kinds of basic loads requires different, wherein: the real-time of digital speech requires the highest, the real-time of digital fax is taken second place, the real-time of general data requires minimum, and this just requires respectively these three kinds of basic loads to be defined, to guarantee in transmission course, for it provides different transmission QOS, to satisfy each user's demand to greatest extent.

Purpose of the present invention is exactly to expand the Payload the type field that comprises 4 bytes, so that distinguish three kinds of basic load types, for laying the first stone for transmission frame provides corresponding QOS in frame-relay network.When the Payload the type field is expanded, except distinguishing three kinds of basic loads, the function of TOS (COS) Field Definition in the IP packet also is provided, because, in VOIP (voice on the IP), rely on the abundant QOS characteristic of IP (Internet protocol) network, can guarantee the quality of ip voice preferably.

For this reason, introduce the structure of IP packet earlier, as shown in Figure 2, it has 8 positions the TOS field in the IP data packet head, specifically comprises: 3 preferential power and positions that do not re-use at present, 4 TOS positions and 1 are necessary for 0 unused bit and form; Wherein 4 TOS positions are defined as respectively: minimum delay, maximum throughput, high reliability and least cost; These four parameters are used for characterization data bag institute loaded service and wish the quality assurance main points that obtain, and the network equipment can give the different service guarantees of packet of this kind business according to the difference of parameter.For example: FTP (file transfer protocol (FTP)) business generally is used for transmitting lot of data, so the value in the data I P of ftp business bag TOS territory is generally maximum throughput.The data of SNMP (Simple Network Management Protocol) webmaster business wish that high reliability is arranged, so the IP of SNMP business datum bag TOS territory is generally high reliability.Had behind above-mentioned four parameters in the process of carrying out the IP data packet transmission, just can provide different transmission QOS according to the needs of different IP packet.

The present invention considers compatibility standard FRF.11, on the one hand foregoing three kinds of basic loads are distinguished, increase the TOS position that defines in the similar IP data packet head on the other hand, thereby make in frame-relay network and also can provide different transmission QOS according to the needs of different transmission frames, the present invention has carried out expanded definition with the Payload the type field in the transmission frame of FRF.11 standard code, referring to Fig. 3, specifically comprise:

When 4 positions of Payload the type field are " 0 ", the pay(useful) load of still representing transmission frame is a basic load, certainly, when utilizing the present invention that basic load has been carried out distinguishing definition, no longer use this definition, in the frame-relay network to the differentiation of basic load definition among nonrecognition the present invention, still adopt corresponding definition of the prior art;

When 4 positions of this field are " 0001 ", the digital keys of the FRF.11 appendix A definition of representing to carry in the transmission frame of this FRF.11 standard code;

When 4 positions of this field are " 0010 ", the signaling of the FRF.11 appendix B definition of representing to carry in the transmission frame of this FRF.11 standard code;

When 4 positions of this field are " 0011 ", the facsimile data of the FRF.11 appendix C definition of representing to carry in the transmission frame of this FRF.11 standard code;

When 4 positions of this field were " 0100 ", what represent to carry in the transmission frame of this FRF.11 standard code was quiet data;

When 4 positions of this field are " 0101 ", be expressed as the expansion basic load of the present invention's definition, and the pay(useful) load of carrying is the digital speech basic load;

When 4 positions of this field are " 0110 ", be expressed as the expansion basic load of the present invention definition, and the pay(useful) load of carrying is the digital fax basic load, described digital fax is not the datafax of FRF.11 appendix D prescribed form;

When 4 positions of this field are " 0100 ", be expressed as the expansion basic load of the present invention's definition, and the pay(useful) load of carrying is the general data basic load;

When 4 positions of this field are " 0100 ", be expressed as the expansion TOS position of the present invention's definition, and implication is the minimum delay;

When 4 positions of this field are " 0100 ", be expressed as the expansion TOS position of the present invention's definition, and implication is a maximum throughput;

When 4 positions of this field are " 0100 ", be expressed as the expansion TOS position of the present invention definition, and implication is high reliability;

When 4 positions of this field are " 0100 ", be expressed as the expansion TOS position of the present invention's definition, and implication is a least cost.

Payload the type field above adopting after the expansion, just on the basis of existing FRF.11 standard, increased the function expansion aspect two: the one, can distinguish three kinds of basic loads, the VOFR gateway can be taked different service priority according to different load type; The 2nd, increased the define field that the COS of load is required, like this, when transmitting in frame-relay network, gateway can be taked different QOS strategies at the respective transmissions frame according to the difference of this field.

Based on above-mentioned expansion to the Payload the type field, the embodiment of the method for transmission frame reliable transmission specifically comprises referring to Fig. 4 in the achieve frame junction network of the present invention:

Step 41: definite transmission frame that needs the FRF.11 standard of transmission, promptly need carry out the transmission of respective loads with the transmission frame of FRF.11 reference format in the frame-relay network;

Step 42: the TOS that provides for it maybe is provided the basic load type that the Payload the type field in the described transmission frame is added the transmission frame pay(useful) load, specifically can add according to previously described, for example, when the pay(useful) load of transmission frame carrying is the digital speech basic load, then the Payload the type field is added to " 0101 ", when the TOS that provides for transmission frame adopts the minimum delay if desired, then the Payload the type field is added to " 1001 ", and the like;

Step 43: the transmission frame of described FRF.11 reference format is transmitted in frame-relay network, except the processing of it being carried out relate in the prior art such as routing forwarding, also need execution in step 44 in the whole transmission course, guarantee the QOS in its transmission course;

Step 44: in the process that transmission frame transmits in frame-relay network, when congested or other abnormal conditions appear in network, then resolve the Payload the type field in the transmission frame, thereby determine the QOS that need provide for this transmission frame, for example, when Payload the type field loaded information is " 0101 ", illustrate that then the payload in this transmission frame is the digital speech basic load, digital speech is a real time data, usually comparatively harsh to the requirement of time delay, therefore, need carry out the transmission of higher priority to it, and when Payload the type field loaded information is " 0111 ", illustrate that then the payload in this transmission frame is the general data basic load, for general data, comparatively loose to the requirement of time delay usually, therefore, do not need it is preferentially sent; Transmission frame resolved normally on router or frame relay switch, carry out;

Step 45: for the QOS that this transmission frame provides this transmission frame is transmitted in frame-relay network according to the needs of determining, it is step 44 required QOS parameter that provides when having determined that this transmission frame transmits in frame-relay network, as send priority, the time delays that allow etc., this step are then carried out the transmission of transmission frame according to the QOS parameter of determining for transmission frame.

Through the description of above-mentioned steps 41 to step 45, the present invention has realized can providing reliable assurance for the transmission quality of real time datas such as digital speech by determine the method for transmission frame QOS in frame-relay network equally thereby make in frame-relay network.

Claims (8)

1. the method for transmission frame reliable transmission in the achieve frame junction network is characterized in that comprising:
But a, in the extended field of the frame format of FRF.11 standard, the service quality QOS that definition need provide for transmission frame;
B, when the transmission frame of described FRF.11 reference format transmits in frame-relay network, according to the definition needs provide corresponding transmission service for its QOS that provides for this transmission frame.
2. the method for transmission frame reliable transmission in the achieve frame junction network according to claim 1, it is characterized in that described step a is: in the PT Payload Type PayloadType field of the frame format of FRF.11 standard, the QOS that definition need provide for transmission frame.
3. the method for transmission frame reliable transmission in the achieve frame junction network according to claim 1 and 2 is characterized in that the QOS that described definition need provide for transmission frame is: the QOS of the COS definition transmission frame that load type by definition transmission frame carrying or definition need provide for transmission frame.
4. the method for transmission frame reliable transmission in the achieve frame junction network according to claim 3 is characterized in that the load type of described definition transmission frame carrying comprises: define transmission frame respectively and carrying digital speech basic load, digital fax basic load or general data basic load.
5. the method for transmission frame reliable transmission in the achieve frame junction network according to claim 4 is characterized in that described step b comprises:
The transmission frame of FRF.11 reference format transmits in frame-relay network;
Resolve the field of definition bearing load type in the transmission frame, determine the load type of transmission frame carrying;
Its QOS that provides is provided needs when determining the conducting frame transmission according to the load type of transmission frame carrying.
6. the method for transmission frame reliable transmission in the achieve frame junction network according to claim 3 is characterized in that described definition need comprise for the COS that transmission frame provides: definition minimum delay that need provide for transmission frame, maximum throughput, high reliability and least cost respectively.
7. the method for transmission frame reliable transmission in the achieve frame junction network according to claim 6 is characterized in that described step b comprises:
The transmission frame of FRF.11 reference format transmits in frame-relay network;
Resolve the type of service field in the transmission frame, the COS that need provide for transmission frame is provided;
Its QOS that provides was provided needs when the COS that provides for transmission frame according to the needs that parse was determined the conducting frame transmission.
8. according to the method for transmission frame reliable transmission in claim 5 or the 7 described achieve frame junction networks, it is characterized in that described parsing transmission frame is: on router or frame relay switch, transmission frame is resolved.
CNB031576915A 2003-06-26 2003-09-05 Method for realizing frame reliable transmission in frame relay network CN100366027C (en)

Priority Applications (3)

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CN03145507.7 2003-06-26
CN03145507 2003-06-26
CNB031576915A CN100366027C (en) 2003-06-26 2003-09-05 Method for realizing frame reliable transmission in frame relay network

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Application Number Priority Date Filing Date Title
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Publication number Priority date Publication date Assignee Title
CN103957567B (en) * 2009-06-19 2017-11-03 中兴通讯股份有限公司 The method and apparatus guaranteed service bearing transmission delay
CN101990325B (en) 2009-07-31 2013-04-24 华为技术有限公司 Method, device and system for determining and maintaining QoS (Quality of Service) parameters of multi-hop network

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