Doc.: IEEE 802.11-02/688r0 Submission November 2002 Mike Moreton, Synad TechnologiesSlide 1 MA-UNITDATA- STATUS.indication Interpretation There are two.

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Presentation transcript:

doc.: IEEE /688r0 Submission November 2002 Mike Moreton, Synad TechnologiesSlide 1 MA-UNITDATA- STATUS.indication Interpretation There are two possible interpretations of when this is sent. (1) Synchronously, immediately after receipt and decoding of the MA- UNITDATA.request. (2) Asynchronously after the transmission attempt(s) associated with an MA- UNITDATA.request have completed.

doc.: IEEE /688r0 Submission November 2002 Mike Moreton, Synad TechnologiesSlide 2 Arguments for Synchronous Interpretation Apparently someone argued very strongly for it, but no-one seems to know who, or why.

doc.: IEEE /688r0 Submission November 2002 Mike Moreton, Synad TechnologiesSlide 3 Arguments For Asynchronous Interpretation Some of the values of the “Transmission Status” field only make sense for asynchronous behaviour. If it was a synchronous response it should have been called “MA-UNITDATA.confirm”. SDL says it is sent “if request is invalid, or when status is available” which suggests that the behaviour may be asynchronous indicates that a status primitive should in general be returned after the associated indication at the remote party. Means that no changes are required to the current issued standard.

doc.: IEEE /688r0 Submission November 2002 Mike Moreton, Synad TechnologiesSlide 4 RFC1925 “In protocol design, perfection has been reached not when there is nothing left to add, but when there is nothing left to take away. “

doc.: IEEE /688r0 Submission November 2002 Mike Moreton, Synad TechnologiesSlide 5 Motion “Direct the editor to back out the following underlined changes from section : b) Undeliverable (for unacknowledged directed MSDUs when the adot11ShortRetryMax or adot11LongRetryMax retry limit would otherwise be exceeded) [no longer used, listed because this status may be returned by MAC entities conformant to IEEE Std ] 10 ; g) Undeliverable (TransmitMSDUTimer reached dot11MaxTransmitMSDULifetime before successful delivery) [no longer used, listed because this status may be returned by MAC entities conformant to IEEE Std IEEE Std , see footnote in (b)]; In all cases where delivery of the MSDU is attempted, the transmission status parameter returned by the MAC sublayer entity is either (a) or (f). In all cases where no MSDU delivery attempt can be made, the transmission status parameter returned by the MAC sublayer entity is one of (c), (d), (e), (h) or (i). 10 Transmission status (b) and (g) should not be returned by implementations conformant to the present standard. Transmission status (b) and (g) are listed for completeness, since they were defined in IEEE Std , but are not likely ever to be returned. It is not possible to determine the occurrence of either of these two cases of an MSDU delivery attempt being abandoned (due to excessive retries for status (b) or due to exceeding the limit on transmit lifetime for status (g)) from local state available within the MAC sublayer entity at the time the MA- UNITDATA.request is received from LLC. Because all MAC data service provided within IEEE Std is connectionless, return of transmission status (b) or (g) is incompatible with the semantics of the MA-UNITDATA- STATUS.indication primitive. Implementers are advised that the existence of transmission status (b) and (g) should not be interpreted as a requirement that conformant implementations be able to return these status values, and are directed to the absence of any reference to this clause in Annex A.4 of IEEE Std ”