help3002

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help3002

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UWA week 13 (1st semester, week 5) ↓

labs lab4 Q2 prioritise retransmit or new transmit (all 4)

3:09pm Wed 27th Mar, Christopher M.

ANONYMOUS wrote:

> What I meant is that the parameter is [the probability that a node has a new frame for transmission], if a specific node is already trying to retransmit, do we ignore any new frames for that node.

You don't *ignore* the new frames from that node, your DLL simply des not accept them from the layer above until the older frame has been successfully transmitted.

> As in context, I believe a node may be able to get a new frame it needs to transmit while it is still attempting to retransmit an older frame that has collided.

(although we're not coding this question in any language), but in cnet if the DLL implements a stop-and-wait protocol, we temporarily disable the AL so that it won't inform us of any new frames for delivery. Then re-enable it when the older frame has gone and been acknowledged.