Minicell alignment

Details Minicell alignment Minicell alignment

1996-10-30

1999-12-21

Ton, Dang

Multiplex communications

Communication techniques for information carried in plural...

Assembly or disassembly of messages having address headers

370395, H04L 1256

Patent

active

060058714

ABSTRACT:
In a telecommunication system that employs asynchronous transfer mode (ATM) and minicells to transport communication data, accurate minicell header information dramatically improves the ability to align the minicells at a receiving station. More accurate minicell header information can be achieved by deriving a single header integrity check code (e.g., a cyclic redundancy code) for each ATM cell based upon minicell headers that have been inserted into contiguous locations in the ATM cell. By inserting the headers in contiguous locations, the receiving station can extract each header without having to rely upon the length indicator codes in each header, which may contain one or more bit errors. This, in turn, allows the receiving station to recompute the header integrity check code with far fewer errors, thus substantially increasing the probability of detecting and correcting the aforementioned errors and, ultimately, the ability to align the minicells.

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G. Eneroth et al., "Minicell Protocol (AALm) for Low Bit Rate Applications" ATM-Forum 96/0166, Feb., 1996.
T. Ishihara, "Proposal of Short Cell Format for Low Bit Rate Voice", ATM-Forum/95-1478, Dec. 1995.
"AAL-CU-CIF Protection with or without Payload Protection", Swiss Telecom PTT, ITU-T Rapporteur's Meeting on AAL-CU, Stockholm, Jul. 1996.
H. Ohta et al., "A Technique to Detect and Compensate Consecutive Cell Loss in ATM Networks", vol. 2, Apr. 7, 1991, pp. 781-790.
W. Covington, Jr. et al., "Voice Transport on an ATM Broadband Network", vol. 3 of 3, Nov. 27, 1999, pp. 1921-1925 Standard Search Report, Apr. 18, 1997.

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