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ATM signal-element-group bag and bag buffer storage management method

A technology for ATM cell and cache management, applied in the field of communications, can solve the problems of wasting storage space and difficult connection number, etc.

Inactive Publication Date: 2009-02-11
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a packet buffer management method for ATM cell group packets, which solves the problems of wasting storage space and difficult expansion of the number of connections in the existing ATM cell group packet packet buffer management method

Method used

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  • ATM signal-element-group bag and bag buffer storage management method
  • ATM signal-element-group bag and bag buffer storage management method
  • ATM signal-element-group bag and bag buffer storage management method

Examples

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Embodiment Construction

[0024] Such as image 3 Shown is the flow chart of grouping in the packet buffer management method of ATM cell grouping of the present invention. In this embodiment, it is assumed that the ATM frame input from the cell output side is a long packet with a length of 33 cells, that is, 33*48=1584 bytes. First, group packet module 11 receives the input cell (step S31) from the ATM equipment, obtains PVC (permanent virtual connection) index (step S32) from the input cell header information, and judges the current cell according to the cell header information Whether it is the first cell (step S33). In this embodiment, the cell header information includes control information such as the sequence of cells in the ATM frame.

[0025] If the current cell is the first cell, the grouping module 11 applies for a new basic buffer (size is 2k bytes) located in the external storage device 12 to the free buffer management module 14, and allocates an additional space (the size is 2k bytes) fo...

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Abstract

The method includes following steps: (1) if determining the current cell is a head cell, then applying for a basic buffer and an additional space, and writing payload of current cell to starting location of basic buffer; (2) if determining the current cell is a middle cell, then determining whether sequence number of current cell is larger than 32; (3) if sequence number of current cell is smaller than or equal to 32, then writing current cell to basic buffer; if sequence number of current cell is larger than 32, then writing current cell to additional space. Through providing additional space for basic buffer, the invention stores control information to buffer under precondition of not changing bursting operation characters of external memory space, and not changing procedure for processing whole message. Thus, the invention supports ATM frame with cells more than 32.

Description

technical field [0001] The invention relates to the field of communication, in particular to a packet buffer management method for ATM cells. Background technique [0002] In various ATM to IP or Ethernet conversion communication equipment, the grouping work of ATM cells is usually carried out, and the structure of the cell grouping part is as follows figure 1 shown. Grouping module 11 is used for maintaining the grouping link list based on PVC (permanent virtual connection, permanent virtual connection), and after the grouping is completed, the frame control information is delivered to the lower module, wherein the frame control information includes: the length of the ATM frame, The cache address, etc., where the frame is stored in the external storage device. Simultaneously, group packet module 11 also applies for cache (i.e. buffer, here refers to the basic space for storing an ATM frame, capacity is 2k bytes) to free buffer management module (FBM), and writes cells int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/56H04L12/861
Inventor 慕光伊学文
Owner HUAWEI TECH CO LTD