[MIP-QOS] Re: MIP-QOS -- Scope of disc ussions

["ext Murray Philip" <PMURRAY@dera.gov.uk>]

>> 3) How to do handover friendly, end to end QoS for those service
>> providers that don't want to overprovision and want to provide
>> the "all circuits" message?

>>I'd say Micro mobility again !


>>Finally, i'd like to point out that it seems to me one issue is not
being
>>discussed : a call which is initiated in a cell may have some
bandwidth
>>guarantee in a cell (domain ?). Howerver, when the mobile terminal
roams,
it
>>may move into an area which cannot offer the same bandwidth to the
>>terminal(because the bandwidth has been allocated to users with the
same
>>priority level). There are 2 issues :
>>	- degrade the QoS for the user or connect through another path
if
this >path
>>exists (which has been mentioned)
>>	- make sure that this does not happen to often (maybe by
distinguishing
>>handoffs and new calls as it is done in most cellular systems)

>I think the above issue is outside the scope of solution for which we
are
>formulating the requirements. The above issue is a special case of
service
>discovery problem at large. We will still assume that target AR is
known and
>hand over to it. Whether target AR wants to reserve bandwidth for
handover
>calls or wants to handover connection to yet another AR is not within
the
>scope of our problem statement.

I think it should be a consideration of any QoS framework as to how it
responds if at handover the next connection cannot match the previous
guarantee, otherwise we might end up with a period of best-effort
service or a lost call.  

Depends on availability of a AR that can provide the service though.
Would it not be better for the MN to go to the more suitable AR straight
away rather than being pushed on by an unsuitable target AR or would
this introduce extra processing, and battery drain, for little real
performance gain?

Phil


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