Novel System Architecture and Protocol Stack for Video Streaming in Wireless LAN

Computer Networking Assignment
Novel System Architecture and Protocol Stack for Video Streaming in Wireless LAN
Name of the student
Name of the University

Abstract—the report reflects the design, implementation
and testing of video streaming application which communicate
over IEEE 802.11-based wireless network. The IEEE 802.11-
based wireless network will use the data link and application
layer for processing the video packets. The novel system
architecture provides an over view of how the server
communicates. The protocol stack provides an idea of what
computer networking protocol suite will be installed in the
application.
Keywords—protocol stack, novel system architecture, video
streaming, wireless LAN
I. BACKGROUND
It had been possible to transmit the applications of video
over the bandwidth constrained wireless channels. On the
basis of various applications as well as requirements,
numerous bit rate reduction algorithms have been proposed
[1]. In recent time, a significant progress had been reported
in which the authors a proposed a particular rate of distortion
based model. This model uses numerous Lagrangian
multipliers in pixel and them it converts the domains in order
to gain the necessary outcomes. The price of RD is reduced
in the transform domains as well as pixel. Various
experimental results had shown that the transcoding model
that has been proposed, gives a decent level of balance in the
tradeoff among transcoding speed and high performance[2].
In a particular error resilient transcoding scheme, the RD
optimized inter mode as well as intra mode decisions are
taken on the basis of the impacts of the channel errors that
has been propagated to the frame situated after that.
II. SYSTEM DESIGN
A. Priliminary Description
The framework that has been designed on the basis of
cross layer comprises of a particular cross-layer module. This
particular module interfaces with data link layers and
application layers which are a part of TP/IP protocol stack.
The cross layer module usually has four elements; these
elements had been summarized in this assignment. Initially,
the estimator of channel is considered as the core part of the
cross layer module [3]. This is considered to be responsible
for the purpose of estimating the present conditions of the
channel that have been extracted from data on the attempts of
transmission of packets that are available in the data link
layer. The information regarding channel that has been
estimated is fed to a specific transcoding controller, buffer
controller as well as a particular FEC/ARQ controller. In this
assignment the terms cross layer framework and CLM would
be used in an interchanged manner. Slow varying channel
that is wireless in nature has been considered where the
channel stage would not change while a transmission takes
place in a frame.
Figure 1: Protocol Stack for Wireless Lan of Video
Streaming Application
B. Destailed Description
The wireless channels usually varies with time as well as
space dimensions. Estimation of the present wireless
channel condition is considered as the initial step of building
the framework that has been proposed. The errors in this
channel have been characterized with the help of average
bit-error rate. In a particular environment that is wireless in
nature, it is considered as very vital to note the fact that a
channel state information which is available in the side of
the receiver could not be used at the side of the
transmitter[4]. This is because of the fact that latency is
involved in the transferring of information from a particular
receiver to a particular transmitter. This is the result why the
results obtained from the real time result of video streaming
relies on estimation of channel at the side of transmitter
where the estimation of a channel is made on the basis of
various parameters that are available at the transmitter[5].
An example of this includes the retransmission parameter.
On the basis of the channel information that is available
through packet transmission attempts as well as the standard
size of application layer. The application layer suggests a
better strategy in order to transcode the bit stream of the
video that is incoming.
Among all the key elements of cross layered based video
streaming framework, the fourth one is considered as
optimum and the fourth key element is FEC/ARQ controller.
This controller attempts to select the redundant FEC packets
for a particular Rmax that is available at data link layer[6].
In order to stop a video packet from getting rejected in the
receiving point, the overall amount of transmissions time of a
particular video frame should fulfill the time constraint
belonging to the Ttot_< Tdl. In this case the Tdl is
considered as the deadline time of a provided video frame.
Figure 2: Novel System Architecture Video Streaming
Application