Title:
Implicit Quality Channels (IQC): Distributed Quality Management for Multi-Party Real-Time Applications
Implicit Quality Channels (IQC): Distributed Quality Management for Multi-Party Real-Time Applications
Author(s)
Poellabauer, Christian
Schwan, Karsten
Schwan, Karsten
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Abstract
Multi-party, interactive multimedia (MIM) applications pose challenges for
resource management due to their simultaneous use of multiple media and
their heterogeneous, distributed, and potentially large numbers of
participants. Two main difficulties are the support of (1) quality of
service (QoS) and (2) scalable group or multi-peer communication, where QoS
management is complicated by relationships between different media streams
and by the sizes and dynamics of
groups. That is, QoS management must capture not only the identities of
group participants, but also their run-time behavior. This paper describes a
novel operating system construct, termed Implicit Quality Channels (IQC),
which extends standard Berkeley Sockets to support resource management of
multi-peer applications like teleconferencing and CSCW. Specifically, when a
participant joins an MIM, its inclusion in the MIM's quality management
infrastructure is triggered
transparently. Such inclusion is implemented in three steps. First, when
creating a listening socket, the MIM associates appropriate quality
management information with that socket. Second, when another participant
connects to this socket, the operating system kernels involved implicitly
create a kernel-level event channel that will carry this QoS as well as
adaptation information. Third, the resource managers
on the participating hosts transparently subscribe to this event channel,
thereby dynamically creating appropriate groupings of collaborating resource
managers and ensuring that all participants are managed properly.Management
includes the monitoring of participant behavior, the submission and receipt
of adaptation events, and the dealing with requests for re-negotiation of
the initial QoS. In effect, any MIM participant establishing a connection to
an MIM-provided socket implicitly accepts the MIM's QoS management.
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Date Issued
2001
Extent
378919 bytes
Resource Type
Text
Resource Subtype
Technical Report