Providing quality of service by transmitting XML files...

Details Providing quality of service by transmitting XML files... Providing quality of service by transmitting XML files...

2000-03-30

2004-10-12

Wiley, David (Department: 2143)

Electrical computers and digital processing systems: multicomput

Computer network managing

Computer network access regulating

C709S229000, C709S238000, C370S229000, C370S235000

Reexamination Certificate

active

06804717

ABSTRACT:

BACKGROUND
This invention relates to providing quality of service.
The popularity of the World Wide Web and the emergence of the Internet as a publishing medium have led to increased use of the Internet for interactive, multimedia applications, e.g., video and audio conferencing. Most of these applications involve streaming and downloading multimedia content across the Internet. Streaming allows a user to start viewing data as a continuous stream before receiving the entire multimedia file. For streaming to work effectively, these applications may require some Quality of Service (QoS) guarantees in terms of traffic prioritization, bandwidth reservation, and delay guarantees.
QoS provides the ability to provision bandwidth and other resources so that different data service levels can be assigned to specific data types, applications, or users. With QoS, higher priority data types receive preferential access to bandwidth and other resources while lower priority data types still receive a minimally acceptable amount of bandwidth. Using RSVP (resource reservation setup protocol), an application can reserve resources to transmit the data along a route from a source to a destination. RSVP-enabled routers schedule and prioritize all of the packets of data to fulfill the QoS requirements. Thus, QoS can ensure a guaranteed level of end-to-end service by guaranteeing, for example, data throughput, data bandwidth and other resource sharing, e.g., a server on the Internet, to another location, e.g., the user, for a certain amount of time.
Referring to the example shown in
FIG. 1
, the total bandwidth available between two end-points, e.g., a user
10
a
and a web server
22
, across a network segment
16
is 500 kbits, and users
10
a
and
10
b
share the connection to the network segment
16
via an Internet service provider (ISP) router
12
. User
10
a
is trying to stream a 300 kbit video stream
14
from the web server
22
on the Internet
20
across the network segment
16
while user
10
b
is participating in a video conference
18
with a corporate office
24
using the same network segment
16
as user
10
a
. User
10
b
may have already reserved bandwidth, e.g., 400 kbits, across the network segment
16
using RSVP. Thus, even though user
10
a
might reasonably expect to receive the video stream
14
without any loss because 300 kbits fit on the 500 kbit network segment
16
, user
10
a
will, actually experience loss, e.g., video freezing because the user
10
a
is unaware of other traffic on the 500 kbit network segment
16
. In this example, even if user
10
a
knew of the 500 kbit capacity across the network segment
16
and consequently chose the 300 kbit video stream
14
instead of a lower quality video stream, e.g., 200 kbits, or a higher quality stream, e.g., 600 kbits, user
10
a
may still need to resort to trial-and-error to choose the appropriately sized video stream
14
.


REFERENCES:
patent: 5768271 (1998-06-01), Seid et al.
patent: 5894471 (1999-04-01), Miyagi et al.
patent: 6411601 (2002-06-01), Shaffer et al.
patent: 6459682 (2002-10-01), Ellesson et al.
patent: 6563794 (2003-05-01), Takashima et al.

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