CN1170290A

CN1170290A - Transmission method of data service in integrated services packet digital network

Info

Publication number: CN1170290A
Application number: CN96117005A
Authority: CN
Inventors: 鲍炜
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-07-09
Filing date: 1996-07-09
Publication date: 1998-01-14

Abstract

A non-real-time data communication method by means of ISDN with high-speed packet exchange, especially the W -ISDN based on ATM is disclosed. When burst services which has higher requirement in time delay and loss rate exist over the network, the method can increase the utilization rate of resources in network.

Description

A kind of transmission method of data service in the integrated service packet digital network

The present invention relates to a kind of integrated services digital network that is used for the high-speed packet exchange, particularly based on asynchronous transfer mode (Asynchronous Transfer Mode, ATM) carry out the non-real-time data method for communicating in the broadband integrated services digital network, belong to the digital communication network flow control technique field in the communication technology.

Packet communication network at a high speed will be supported the communication service of multiple different qualities as broadband integrated services digital network.The important business of two classes wherein, the one, have the sudden variable bit rate business that higher delay requirement and certain Loss Rate require, as the telephone service of video communication and compressed encoding.Hereinafter be referred to as bursts of traffic.The existence of this class business makes circuit bandwidth availability ratio reduction in the net.Another kind of business is insensitive data communication service of time, as file transfer.Hereinafter be referred to as data service.Because communication bandwidth is a kind of valuable source in the communication network, how improving bandwidth availability ratio is an important problem.Existing scheme is to utilize the feedback information in the net that data traffic packets is transmitted when having resource idle, as available bit rate (Available BitRate Service, ABR).The shortcoming of this scheme is that control efficiency is lower when communication link is longer, and the buffer storage quantity that needs increases with the increase of signal propagation delay.

The purpose of this invention is to provide a kind of the existence at the same time under the long environment of bursts of traffic and communication distance, can effectively utilize line bandwidth and the slow flow control methods that fills the data service communication of memory.

In order to realize this purpose, the solution of the present invention is as follows: suppose to have one or more sudden information sources simultaneously at a data service information source place, the information block of these bursts of traffic and current data service claims then that by will be in net behind this node the statistical resource-sharing taking place on other node or the channel these bursts of traffic are the related service of this data service.Basic thought of the present invention is to make in the gap that is grouped in its related service of data service to send, to improve the stationarity of mixed service stream as far as possible.Specific algorithm is: introduce a variable N, and set its upper and lower bound, when the N value is prescribed a time limit greater than following, it is reduced in time in a certain way, simultaneously, when N is sent out less than last grouping or the current data traffic packets that needs only any one related service in limited time, then make N increase certain value.When N less than certain value, and when not having transmission and striving unexpectedly, allow the current data traffic packets to be sent out.Above-mentioned algorithm also can be the opposite equivalent processes of N increase and decrease, and greater than a certain particular value and when not having send competition allow packet transmission as N this moment.

It is a virtual general arrival that aforementioned algorithm can simplify, the fixed length service, and Single-Server queuing service (G/D/l/M) process in finite queue space, N is its team leader.Wherein the cell of any one relevant real time business or data service sends and constitutes client's arrival event, have only when the team leader be zero, and when not having the real time business cell and need send, allow the data service cell to send.

Method of the present invention not only can be used for the user-network interface place, also can be used to net simultaneously interior arbitrary node.

After adopting this method, can make full use of the flow gap of bursts of traffic, increase the overall bandwidth utilance of network.Simultaneously, because under identical average traffic condition, this method can improve the stationarity of integrated service stream, it is less therefore to delay the requirement of filling memory, and this is more meaningful when long haul communication.In addition owing to do not need net internal feedback information, make network control simple and avoided more administration overhead.

Embodiment 1: data and real-time variable bit rate business transmits with the road under the asynchronous transfer mode.The real-time variable bit rate business here comprises phone, TV, video conference etc.As in a variable bit rate communication, there being non-real-time data to need to transmit, the data service cell suitably is inserted in the real time business stream, carry out high efficiency transmission.The i.e. related service of data service for this reason of variable bit rate service wherein.Insert control algolithm and can be above-mentioned shortcut calculation.This function can realize in Communications Interface Unit.

Embodiment 2: by the mixed communication of multimedia messages and non real-time file transfer between the LAN (Local Area Network) of ATM switch interconnection.Wherein multimedia communication is as real-time variable bit rate business, and file is transmitted as the non-real-time data business.Its function can realize in the communication server or network router.

Non-real-time data on the embodiment 3:ATM net middle and long distance link transmits.Real-time bursts of traffic is a large amount of the existence in the ATM net.Utilize comparatively difficulty of flow control that feedback information carries out data service on the long distance, the open-loop control method that the therefore suitable the present invention of employing proposes, and on the link of close together, can adopt closed-loop control, may reach the highest communication efficiency like this.If any a data communication virtual connections and one or more variable bit rate communication virtual connections, its virtual path all arrives switch b by switch A, and data source arrives the propagation delay of the propagation delay of switch A much smaller than two inter-exchanges, then can between switch A and data source, adopt the reaction type flow control, adopt the present invention's open-loop control method at the switch A place, wherein the i.e. related service of data service for this reason of the business of this group variable bit rate virtual connections.

Claims

1. one kind is used for the integrated service network that high-speed packet exchanges, particularly based on the communication control method of non-real-time data business in the broadband integrated services digital network of asynchronous transfer mode, it is characterized in that: introduce a variable N, and set its upper and lower bound value, when N prescribes a time limit greater than following, it is reduced in time in a certain way, simultaneously, when N prescribes a time limit down less than base, when each related service grouping or current data traffic packets are sent out, the N value increases, when N value less than certain certain value and when not having the competition of transmission, permission current data traffic packets is sent out.Here related service refers to have on other node or the channel in net with the current data business the sudden time-sensitive business of statistical resource-sharing.

2. flow control methods according to claim 1, it is characterized in that: it is the broadband integrated services digital network that is used for asynchronous transfer mode, whenever the cell of a related service or the cell of current data business are sent out, if the N value less than its upper limit, then makes N increase certain value, when N prescribes a time limit greater than following, make it reduce certain value at regular intervals, when the N value less than a certain particular value, and do not have when sending competition, allow the professional cell of current data to be sent out.

3. according to claim 1,2 flow control methods, it is characterized in that: N is a virtual general arrival, the fixed length service, the team leader of the queuing service process in finite queue space, wherein the cell of any one related service or current data business sends and constitutes an arrival event, has only when the team leader is zero and does not have the competition of transmission, allows the professional cell transmission of current data.

4. according to claim 1,2 non-real-time data job flow control method is characterized in that: it is a claim 1, the opposite equivalence algorithm of increase and decrease of N in 2.