Methods and apparatus for performing time interleaved multiplexed rate adaptation for sub-rate channels in a digital data communication system
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United States of America Patent
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Jan 22, 1991
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N/A
app pub date -
Feb 9, 1989
filing date -
Feb 9, 1989
priority date (Note) -
Expired
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Abstract
Methods and apparatus are set forth which improved the sub-rate channel carrying capacity and the efficiency of bandwidth usage, over the CCITT I.463 standard, for switching systems having a switching 'granularity', defined as the smallest channel size that can be switched through the system, of better then 64 Kbps (e.g. a switching system that can switch 8 Kbps fragments). These methods and apparatus are capable of performing rate adaptation for multiple synchronized subrate channels in accordance with a predefined multiplexing protocol. The protocol calls for 'time interleaved' multiplexed rate adaptation to be performed, i.e., multiple sub-rate channel data is packaged into fragment size envelopes (or integer multiples thereof). The width of a fragment is also matched (ideally equal) to the granularity of the system's switch. As a result of using the time interleaved multiplexed rate adaptation scheme, the rate adaptation process, the channel carrying capacity of the system at large, and the use of the system's switching and bandwidth capacity are all improved.
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