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Method and device for transmitting constant-rate data stream

A constant rate, transmission rate technology, applied in the field of communication, can solve the problem of uneven reception rate of the sink, irregular time slots, and different transmission rates of data frames.

Active Publication Date: 2014-05-21
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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Taking the E1 data stream of 2.048Mbit / S±50ppm from the source end to the sink end as an example, the specific process of transmitting a constant rate data stream 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 encapsulates the constant rate data stream into a data frame;

[0043] Among them, the constant rate data stream is encapsulated in the data frame with bits as the smallest encapsulation unit, and the length of the payload is fixed.

[0044] Specifically, the source uses bits as the minimum encapsulation unit, which can be 1 bit or more bits. On the one hand, the selection of the smallest encapsulation unit is related to the length of the reference clock. The longer the length of the reference clock, the larger the range of the payload in the data frame each time. Therefore, appropriately increasing the smallest encapsulation unit can also meet the needs of the sink. , That i...

Embodiment 2

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

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

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

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

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

Embodiment 3

[0101] In 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 embodiment, the constant rate data stream is described by taking E1 as an example. Since 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 satisfy multiple services The transmission physical clock can carry the data stream at the maximum frequency deviation. Table 1 shows the PL payload length of constant rate client data streams of other rates under the reference clock TS=125us:

[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

DS3 / T3

44.736Mbit / s±895bit / s

5592bit

5593bit

E4

139.264Mbit / s±2...

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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 a constant rate data stream Background technique [0002] The multi-service transmission network is a multi-service transmission 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-node and S-node. N-node is an ordinary distributed service access node. In addition to the function of N-node, S-node is also a node that connects to the upper network. When a fixed bandwidth service (such as TDM, SDH / SONET, dedicated line service) is transmitted in the network, the network is a peer-to-peer switching network that can add and drop fixed bandwidth services from any node. The existing process of transmitting a constant rate data stream (for example: TDM data stream) through a multi-service transmi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04L12/70H04L12/811
Inventor 李昆周建林
Owner HUAWEI TECH CO LTD
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