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Method for realizing hybrid burst recombination at ATM adaptive tier

A technology of ATM adaptation layer and protocol data unit, which is applied in the field of hybrid fragmentation and reorganization in the ATM adaptation layer, which can solve problems such as duplication and waste of resources, and achieve the effects of cost reduction, unified method, and high adaptability

Inactive Publication Date: 2004-09-15
ZTE CORP
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Problems solved by technology

[0017] The technical problem to be solved by the present invention is to overcome the shortcomings of resource waste and process duplication caused by the separate implementation of AAL2 SSCS and AAL5 CPS, reduce the difficulty of system implementation, and bring greater flexibility and applicability to the system

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  • Method for realizing hybrid burst recombination at ATM adaptive tier
  • Method for realizing hybrid burst recombination at ATM adaptive tier
  • Method for realizing hybrid burst recombination at ATM adaptive tier

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Embodiment Construction

[0058] Fig. 8 is a schematic diagram of implementing AAL2 and AAL5 using a hybrid SAR method according to the present invention. It adopts public software and hardware resources and realizes it uniformly. The function of AAL2 layer is composed of CPS and mixed SAR module; and the processing of AAL5 only needs mixed SAR processing module.

[0059] Fig. 9 is a data flow diagram of fragmentation and recombination in the present invention: a SAR-SDU adds a tail and obtains several SAR-PDUs through fragmentation, wherein the first SAR-PDU is a BOP (Begin OfPacket), and there is only one; The last SAR-PDU is EOP (End Of Packet), there is only one; the rest are MOP (Middle Of Packet), there can be no, there are one or more. EOP and BOP can also be the same SAR-PDU. Reassembly is the inverse process of fragmentation. A system SAR-PDU is reassembled and the tail is removed to obtain the SAR-SDU.

[0060] Fig. 10 illustrates the recombination method of the present invention with a sp...

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Abstract

First, SDU data is received in procedure of recombination. Whether type of ATM adaptation layer is AAL2 or AAL5 is determined. Then steps of look-up table, verification, recombination, transmission and updating are implemented to realize mixed recombination. Unit data of service data are received first at banding phase. Based on length of data unit in AAL type setting protocol, banding, PDU generation and sending steps are implemented to realize mixed banding. Since AAL2 SSCS and AAL5 CPS is realized unitedly as well as ATM layer and mixed SAR treatment module are shared, the invention possesses advantages of reducing difficulties and cost for developing software and hardware, reducing maintenance cost caused by unitive method. Under invariable total flow, dynamic load adjustment can be carried out by mixed SAR module.

Description

technical field [0001] The present invention relates to a kind of method that realizes hybrid fragmentation and reassembly SAR (Segmentation and Reassembly) at ATM adaptation layer, particularly relate to a kind of AAL2 (Asynchronous TransferMode Adapter Layer2, ATM adaptation layer 2) and AAL5 (Asynchronous TransferMode Adapter Layer5, ATM Adaptation layer 5) The general method of hybrid SAR fragmentation reassembly is especially suitable for the occasion of adopting network processor or DSP (Digital Signal Processing, digital signal processing) to program the ATM interface with AAL2 and AAL5 at the same time. Background technique [0002] ATM (Asynchronous Transmission Mode) technology is a fast packet switching developed on the basis of packet switching technology, which overcomes the limitations of packet switching and circuit switching, and comprehensively absorbs the high efficiency of packet switching and the high speed of circuit switching. The advantages. At presen...

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Application Information

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IPC IPC(8): H04L12/24H04L12/26H04L12/42H04L29/06
Inventor 张军张钢钢崔炎戴庆军
Owner ZTE CORP
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