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Medium Access Control (MAC) and Physical Layer (PHY) - CISE

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4-June-07 P1901_PRO_016_r0<br />

Client Server<br />

PTTP.ACK(i-1)<br />

PTTP.DATA(i)<br />

PTTP.DATA(i)<br />

PTTP.ACK(i)<br />

PTTP.DATA(i)<br />

PTTP.ACK(i)<br />

PTTP.DATA(i+1)<br />

ACK Timer expired<br />

Retransmit last<br />

data block<br />

ACK Timer expired<br />

Retransmit last<br />

data block<br />

Figure 154 ACK timer expiration <strong>and</strong> data block retransmission.<br />

The following figure shows the mechanism of DATA timer expiration <strong>and</strong> Maximum Number of Retransmissions<br />

exceeded, whose consequence is the connection closing:<br />

Submission page 366 UPA-OPERA<br />

ACK Timer<br />

ACK Timer

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