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Method and device for transmitting constant-rate data stream

A constant rate and sending rate technology, applied in the field of communications, can solve the problems of different data frame sending rates, increasing the unevenness of the arrival time of data frames at the sink, and uneven receiving rates at the sink.

Active Publication Date: 2010-10-27
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] On the one hand, because the TDM data flow is asynchronous with the multi-service transmission network, the TDM data flow needs to be encapsulated in data frames before it can be transmitted in the multi-service transmission network. When the fixed payload length is encapsulated, the sending rate of the data frame will be different, resulting in the inhomogeneity of the receiving rate of the sink; when the data frame uses a fixed sending data frame rate, the source uses byte encapsulation, and the change is at least 1 byte , causing the length of the effective payload in the data frame received by the sink to vary by at least 1 byte
[0009] On the other hand, while the DBA technology improves the bandwidth utilization, the time slot of the data frame in the GTC is not fixed. This difference may be close to the frame period of a multi-service transmission network, which increases the difference in the arrival time of the data frame at the sink. Uniformity

Method used

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  • Method and device for transmitting constant-rate data stream
  • Method and device for transmitting constant-rate data stream
  • Method and device for transmitting constant-rate data stream

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Taking the E1 data flow of 2.048Mbit / S±50ppm transmitted from the source end to the sink end as an example, the specific process of transmitting a constant rate data flow is as follows:

[0041] The process of inputting a constant rate data stream at the source, such as Figure 2a Shown:

[0042] S201. The source end encapsulates the constant rate data stream into a data frame;

[0043] Wherein, the constant rate data flow is encapsulated in the data frame with the bit as the minimum encapsulation unit, and the length range of the payload is fixed.

[0044] Specifically, the source uses bits as the minimum packaging unit, which may be 1 bit or more bits. On the one hand, the selection of the minimum encapsulation unit is related to the length of the reference clock. The longer the reference clock, the larger the length range of the payload encapsulated in the data frame each time. Therefore, an appropriate increase in the minimum encapsulation unit can also meet the n...

Embodiment 2

[0074] In a multi-service transmission network, taking the transmission of 2.048Mbit / S±50ppm E1 data flow from the source end to the sink end as an example, the specific operation process of transmitting a constant rate data flow is as follows:

[0075] The specific process of inputting a constant rate data stream at the source end, such as Figure 4a Shown:

[0076] S401. The source acquires control information of the constant rate data stream, and encapsulates the control information and the constant rate data stream into a data frame;

[0077] Wherein the control information includes the input rate of the constant rate data stream in each reference clock cycle or the rate difference between the input rate and the nominal rate of the constant rate data stream;

[0078] The constant-rate data stream is encapsulated in a data frame with bits as the minimum encapsulation unit, the data frame carries the calculated input rate or rate information of the rate difference, and the ...

Embodiment 3

[0101] The method for sending a constant rate data stream provided by another embodiment of the present invention, the specific process is as follows:

[0102] In the above-mentioned embodiment, the constant rate data stream is illustrated by taking E1 as an example. Since the constant data streams of different rates correspond to different payload lengths, the calculation of the payload length can refer to the above formula (1), and the payload length needs to meet the multi-service The transmitting physical clock can carry the data stream at the maximum frequency deviation. Table 1 shows the PL payload length of the constant-rate client data stream at the reference clock TS=125us at other rates:

[0103] Table 1:

[0104] data stream type

Nominal rate

Nominal length

PL payload length

T1

1.544Mbit / s±50bit / s

193bit

194bit

E1

2.048Mbit / s±50ppm

256bit

257bit

E3

34.368Mbit / s±688bit / s

4296bit

4297bit...

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Abstract

The embodiment of the invention discloses a method and a device for transmitting a constant-rate data stream, relates to the communication field and aims at solving the problem that the rate of a destination end for outputting a constant-rate data stream is inconsistent with the input rate of a source end. In a technical scheme provided by the invention, the method comprises the following steps of: recovering an effective constant-rate data stream from a received data frame; acquiring the receiving rate of the effective constant-rate data stream; and adjusting the transmitting rate of the effective constant-rate data stream based on the receiving rate of the effective constant-rate data stream to equalize the transmitting rate and the receiving rate. The technical scheme of the embodiment of the invention can be used for transmitting the constant-rate data stream.

Description

technical field [0001] The present invention relates to the field of communications, in particular to a method and device for sending constant rate data streams Background technique [0002] The multi-service transport network is a multi-service transport network architecture based on dynamic bandwidth adjustment, supporting point-to-point and point-to-multipoint service connections. The nodes in the multi-service transmission network are divided into two types: N nodes and S nodes. N nodes are ordinary distributed service access nodes. In addition to the functions of N nodes, S nodes are also nodes connected to the upper network. When transmitting fixed-bandwidth services (such as TDM, SDH / SONET, and dedicated line services) in the network, the network is a peer-to-peer switching network, and fixed-bandwidth services can be added or dropped from any node. Wherein the existing process of transmitting a constant rate data flow (for example: TDM data flow) through a multi-ser...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L12/56H04L12/811
Inventor 李昆周建林
Owner HUAWEI TECH CO LTD