Re: [STDS-802-16] The connection granularity
Hi,
I think that this is explained quite well in the standard. A connection
is always related to one service flow. A service flow is related to zero
or one connections. A connection exists for each service flow that is in
the 'admitted' or 'active' state.
The simplest configuration is one where a single service flow is
provisioned in the 'active' state by management action, and all traffic
is carried by this single connection. In your example, this connection
would remain in place between web-browsing sessions.
An operator may decide to provision more than one service flow, as a
means to provide differentiated quality of service to particular types
of traffic. In this case, several connections can exist simultaneously.
Classifiers are used to assign packets to service flows.
The standard allows for dynamic service flows; these are created in a
way that doesn't depend on provisioning information in the MIB, and here
an intelligent higher-layer entity is responsible for defining and
authorising the service flow. A dynamic service flow would be a useful
way of assuring quality of service for VoIP calls, where messaging from
a soft switch could be used to create a constant bit rate service flow
with committed resources, and with QoS parameters to exactly match the
characteristics of the media stream.
Mark
-----Original Message-----
From: owner-stds-802-16@LISTSERV.IEEE.ORG
[mailto:owner-stds-802-16@LISTSERV.IEEE.ORG] On Behalf Of Chi-Chen Lee
Sent: 18 January 2005 04:32
To: STDS-802-16@LISTSERV.IEEE.ORG
Subject: [STDS-802-16] The connection granularity
Hi all,
I have a question about the connection granularity in 802.16 MAC, i.e.
when will a new connection be created? In the standard, it mentions that
"All traffic is carried on a connection, even for service flows that
implement connectionless protocols, such as Internet Protocol (IP)." But
it does not mention the granularity of the connection. For example, will
a new connection (through DSA-xxx) be created for each web browsing or
all web browsing traffic will be carried on the same transport
connection? Which way is preferred in 802.16 MAC or it is just an
implementation issue?
Can anybody clarify this issue?
Best Regards,
Chi-Chen Lee
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Industrial Technology Research Institute Computer & Communications
Research Lab.
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