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Control method and device for cell switching

By using timestamp information for link allocation during the cell exchange process, the data packet sending sequence of the ingress line card is optimized, the delay and jitter problems during the cell exchange process are solved, and the buffering requirements of the egress line card are reduced. Packet reassembly complexity.

Inactive Publication Date: 2012-02-01
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The main purpose of the present invention is to provide a control method and device for cell switching to solve the problems of relatively large delay and jitter in the above cell switching process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Figure 4 A flowchart showing a method for controlling cell switching according to an embodiment of the present invention, the method includes the following steps:

[0027] Step S402, the switching board determines that the link application cells from each ingress line card are received, wherein the link application cells carry application time stamp information;

[0028] The ingress line card applies time stamp information for the link application cell tag according to the established rules. For example, all ingress line cards use a timer with the same time reference to apply for the time stamp information for the link application cell tag. The application time stamp information in this embodiment is the current time stamp of the ingress line card. When the ingress line card has data When it needs to be sent, the link application information element is sent, and the current time stamp is carried in the link application information element.

[0029] In step S404, the ...

Embodiment 2

[0043] Figure 5 A flowchart showing a method for controlling cell switching according to an embodiment of the present invention, the method includes the following steps:

[0044] Step S502, the ingress line card marks the application time stamp information for the link application cell, the application time stamp information in this embodiment is the current time stamp, and sends the link application cell marked with the time stamp;

[0045] see Image 6 , the link application information element of this embodiment includes a type field (Type), an entry line card identification field (EN_ID), an application field (Request) corresponding to each exit line card, and a timestamp information field (Timestamp); wherein, the type field Used to carry the type identification of the current cell; the entry line card identification field is used to carry the address information of the entry line card; the application field is used to carry the exit line card identification; the time s...

Embodiment 3

[0081] Figure 10 A structural block diagram of a device for controlling cell switching according to an embodiment of the present invention is shown, and the device includes an ingress line card 10 , a switch board 12 and an egress line card 14 .

[0082] Wherein, there can be multiple entrance line cards 10 and exit line cards 14, and the entrance line cards 10 of this embodiment include:

[0083] The timestamp marking and sending module 102 is configured to send a link application cell to the switching board 12, wherein the link application cell carries application timestamp information;

[0084] A data cell sending module 104, configured to send a data cell according to the link allocation result of the switching board 12;

[0085] The switch board 12 is connected to the ingress line card 10, and is used to receive link application cells from each ingress line card 10, and perform link allocation according to each application time stamp information, wherein the link is the...

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PUM

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Abstract

The invention discloses a control method and device for cell switching. The method comprises the following steps of: determining to receive a link application cell from each access line card by a switching board card, wherein the link application cell carries application time stamp information; distributing links according to each piece of application time stamp information by the switching board card, wherein the links are links by which the switching board card is connected with each exit line card; and transmitting a data cell according to the allocation result of the links by each access line card. According to the control method and device disclosed by the invention, the problems of time delay and jitter in the cell switching process are solved; the flow at the input end of the switching board card is controlled; and the requirement for cache of the exit line card and the difficulty of data package reorganization are reduced.

Description

technical field [0001] The present invention relates to the field of communications, in particular to a method and device for controlling cell exchange. Background technique [0002] figure 1 The basic structure diagram of the switching network is given. The switching network is composed of two parts, line cards and switching boards. The line cards include: entry line cards and exit line cards. [0003] In order to meet the requirements of switching control, current high-speed routers usually use a fixed-length cell switching mechanism, for example, splitting an arriving IP packet into multiple fixed-length cells. In the switching board, cells can reach the egress line card through multiple paths, and the delays of different paths are different, which causes multiple cells belonging to a data packet to arrive at the egress line card out of order. [0004] And when multiple ingress line cards send data to an egress line card at the same time, the cells of different data pac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56
CPCH04L49/00H04L49/15H04L47/821
Owner ZTE CORP