1. 802.11p MAC Enhancement Proposals November 2004 04-1497 r1
July 2004
doc.: IEEE /0658r0
November 2004
802.11p MAC Enhancement Proposals November r1
Bryan Wells
DENSO INTERNATIONAL AMERICA, INC., LA Laboratories
Bryan Wells, DENSO LA Labs
Bruce Kraemer, Conexant

2. Proposal to provide a Cancel Transmit primitive to the 802.11p MAC
November 2004
Proposal to provide a Cancel Transmit primitive to the p MAC
Proposal
Packets submitted to the MAC for transmission but not yet transmitted may be withdrawn.
Causes the MAC to abandon its attempt to transmit the current message, and reinitialize its operation in preparation for another transmit request.
Withdrawn packet may be re-queued or dropped by upper layer requesting the Cancel Transmit.
Benefits
Provides enhanced QoS for high priority safety messages.
Prevents a pending transmit request from holding up required or desired channel switching.
Bryan Wells, DENSO LA Labs

3. November 2004
Proposal for the p MAC to process only one transmit packet at a time
Proposal
If the MAC receives a new packet for transmission while there is still a packet pending transmission in the MAC, the MAC will cancel the pending transmission and send the new packet .
Benefits
Provides enhanced QoS for high priority safety messages.
Allows upper layers to override pending lower priority packet transmit requests with higher priority packet transmit requests.
Bryan Wells, DENSO LA Labs

4. November 2004
Straw Poll
Do you support the proposal to provide a Cancel Transmit primitive to the p MAC?
Yes:
No:
Bryan Wells, DENSO LA Labs

5. November 2004
Straw Poll
Do you support the proposal for the MAC to process only one transmit packet at a time; canceling pending packet transmit requests in favor of the new request?
Yes:
No:
Bryan Wells, DENSO LA Labs