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Traffic Management for the Available Bit Rate (ABR) Service in ...

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ENDIF<br />

ELSE PR5 =FALSE�<br />

At BRM Receive event:<br />

IF (NI = 0 AND ACR ok)<br />

ENDIF<br />

IF (ACR < ER) PR5 =TRUE ELSE PR5 = FALSE�<br />

ACR = M<strong>in</strong>(ACR +AIR PCR, PCR)�<br />

ACR = M<strong>in</strong>(ACR, ER)�<br />

ACR = Max(ACR, MCR)�<br />

Initialization<br />

ACR ok = True�<br />

PR5 = False�<br />

Note that <strong>the</strong> comparison (ACR SR) may always yield false due to <strong>the</strong> fact<br />

that cells may bescheduled only at certa<strong>in</strong> xed slots. There is typically a m<strong>in</strong>imum<br />

granularity which dictates <strong>the</strong> cell scheduler at <strong>the</strong> source. To account <strong>for</strong> this<br />

scheduler, <strong>the</strong> comparison may be replaced by (ACR SR + ).<br />

7.1.9 Time-Based UILI Proposal<br />

The time-based UILI proposal has a ACR reduction function which depends upon<br />

<strong>the</strong> time T s<strong>in</strong>ce <strong>the</strong> last FRM was sent. While this aspect is similar to <strong>the</strong> August<br />

1995 UILI proposal, <strong>the</strong> o<strong>the</strong>r changes suggested are:<br />

237

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