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Being outside the MAC, the PCs do not have
access to the rtPS state. The MAC CS in both the BS and SS must map traffic
they generate and consume to the connections and this could be for example by
priority bits in the user_priority parameter of the M_UNITDATA.req/ind or in a
C-tag in the payload, or by per PC allocation using the source MAC or IP
address. For this classification and mapping to
take place in the fashion you describe, the connection initiator (whether SS or
BS) needs to have a reason to select rsPS and have knowledge of the MAC
addresses to map and how many per-PC connections to set up (if per PC
connections is really what you want). This could be through explicit configuration
or by other protocols that transfer QoS flow information to intermediate nodes.
This is outside the scope of the 802.16 specification. From 6.3.6.2 : “For an SS, bandwidth
requests reference individual connections, while each bandwidth grant is
address to the SS’s Basic CID, not to individual CIDs.” I.E. The grants are not per connection,
the grants are per SS. So the SS gets granted transmit BW in one lump and it
has to choose how to divide that time up between the connections it is
sustaining. But it asks for the bandwidth for each connection independently. An
implementation could probably pull tricks to reduce the time spent requesting,
by aggregating requests and QoS parameters, but again, this is outside the
scope of the spec. DJ From: subodhkumar
thakur [mailto:subodhkumar.cranes@gmail.com] Hi all, I have a doubt in
request/grant mechanism. I give it below I have a Subscriber
station and I have five other PC's connected to it through Ethernet and
wireless connectivity between SS and BS. Suppose all the PC's
connected to the SS supports Rtps service (i.e., the SS have multiple
connection of same service and all Rtps services are active) then on what basis
the SS is going to ask for BW request i.e. Rtps service has unicast
polling and the BS allocates slot in unicast polling then the SS is going to
ask BW request for all connections as a whole or for individual connections????
(as BW request is grant per connection GPC) Thanks in advance |