Seminar Report Bandwidth Recycling
Bandwidth Recycling in IEEE 802.16 Networks
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Seminar Report Bandwidth Recycling
Abstract
IEEE 802.16 standard was designed to support the bandwidth demanding
applications with quality of service (QoS). Bandwidth is reserved for each
application to ensure the QoS. For variable bit rate (VBR) applications,
however, it is difficult for the subscriber station (SS) to predict the amount
of incoming data. To ensure the QoS guaranteed services, the SS may
reserve more bandwidth than its demand. As a result, the reserved bandwidth
may not be fully utilized all the time. In this paper, we propose a scheme,
named Bandwidth Recycling, to recycle the unused bandwidth without
changing the existing bandwidth reservation. The idea of the proposed
scheme is to allow other SSs to utilize the unused bandwidth when it is
available. Thus, the system throughput can be improved while maintaining
the same QoS guaranteed services. Mathematical analysis and simulation are
used to evaluate the proposed scheme. Simulation and analysis results
confirm that the proposed scheme can recycle 35% of unused bandwidth on
average. By analyzing factors affecting the recycling performance, three
scheduling algorithms are proposed to improve the overall throughput. The
simulation results show that our proposed algorithm improves the overall
throughput by 40% in a steady network.
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Seminar Report Bandwidth Recycling
Algorithm:
Dynamic bandwidth request-allocation algorithm and Priority-based
Scheduling Algorithm
A dynamic bandwidth request-allocation algorithm for real-time services is
proposed in . The authors predict the amount of bandwidth to be requested
based on the information of the backlogged amount of traffic in the queue
and the rate mismatch between packet arrival and service rate to improve the
bandwidth utilization. The research works listed above improve the
performance by predicting the traffic coming in the future. Instead of
prediction, our scheme can allow SSs to accurately identify the portion of
unused bandwidth and provides a method to recycle the unused bandwidth.
It can improve the utilization of bandwidth while keeping the same QoS
guaranteed services and introducing no extra delay
Existing System:
Bandwidth transmitted data may be more than the amount of
transmitted data and may not be fully utilized all the time.
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Seminar Report Bandwidth Recycling
Before it is different from the bandwidth adjustment in which the
adjusted bandwidth is enforced as early as in the next coming frame.
Moreover, the unused bandwidth is likely to be released temporarily
(i.e., only in the current frame) and the existing bandwidth reservation
does not change.
The ad hoc networking community assumes that the underlying
wireless technology is the IEEE 802.11 standard due to the broad
availability of interface cards and simulation models.
Proposed System:
The IEEE 802.16 network is connection-oriented. It gives the
advantage of having better control over network resource to provide
QoS guaranteed services
To improve the bandwidth utilization while maintaining the same QoS
guaranteed services, our research objective is two fold:
the existing bandwidth reservation is not changed to maintain
the same QoS guaranteed services.
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Seminar Report Bandwidth Recycling
our research work focuses on increasing the bandwidth
utilization by utilizing the unused bandwidth.
We propose a scheme, named Bandwidth Recycling, which recycles
the unused bandwidth while keeping the same QoS guaranteed
services without introducing extra delay. The general concept behind
our scheme is to allow other SSs to utilize the unused bandwidth left
by the current transmitting SS. Since the unused bandwidth is not
supposed to occur regularly, our scheme allows SSs with non-real
time applications, which have more flexibility of delay requirements,
to recycle the unused bandwidth.
In this system they are using 802.11 MAC layer to evaluate the
correct bandwidth. This method combines channel monitoring to
estimate each node’s medium occupancy.
Probabilistic combination of the values is to account for
synchronization between nodes, estimation of the collision probability
between each couple of nodes, and variable overhead’s impact
estimation. This mechanism only requires one-hop information
communication and may be applied without generating a too high
additional overhead. These results show that single-hop flows and
multihop flows are admitted more accurately, resulting in a better
stability and overall performance.
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Seminar Report Bandwidth Recycling
Modules:
1. Bandwidth utilization Module:
Bandwidth utilization improvements have been proposed in the literature. In,
a dynamic resource reservation mechanism is proposed. It can dynamically
change the amount of reserved resource depending on the actual number of
active connections. The investigation of dynamic bandwidth reservation for
hybrid networks is presented in. Evaluated the performance and
effectiveness for the hybrid network, and proposed efficient methods to
ensure optimum reservation and utilization of bandwidth while minimizing
signal blocking probability and signaling cost. In, the enhanced the system
throughput by using concurrent transmission in mesh mode
2. Bandwidth recycling Module:
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Seminar Report Bandwidth Recycling
The complementary station (CS). Waits for the possible opportunities to
recycle the unused bandwidth of its corresponding TS in this frame. The CS
information scheduled by the BS is resided in a list, called complementary
list (CL). The CL includes the mapping relation between each pair of pre-
assigned C and TS.
3. QoS guaranteed services Module
It is different from the bandwidth adjustment in which the adjusted
bandwidth is enforced as early as in the next coming frame. Moreover, the
unused bandwidth is likely to be released temporarily (i.e., only in the
current frame) and the existing bandwidth reservation does not change.
Therefore, our scheme improves the overall throughput while providing the
same QoS guaranteed services.
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Seminar Report Bandwidth Recycling
4. Traffic and Packet Performance:
The Packet mean data rate of each application but make the mean packet
size randomly selected from 512 to 1024 bytes. Thus, the mean packet arrive
rate can be determined based on the corresponding mean packet size. As
mentioned earlier, the size of each packet is modeled as Poisson distribution
And the packet arrival rate is modeled as exponential distribution.
The other factor that may affect the performance of bandwidth recycling is
the probability of the RM to be received by the CS successfully.
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Seminar Report Bandwidth Recycling
Conclusion:
We proposed bandwidth recycling to recycle the unused bandwidth once it
occurs. It allows the BS to schedule a complementary station for each
transmission stations. Each complementary station monitors the entire UL
transmission interval of its corresponding TS and standby for any
opportunities to recycle the unused bandwidth. Besides the naive priority-
based scheduling algorithm, three additional algorithms have been proposed
to improve the recycling effectiveness. Our mathematical and simulation
results confirm that our scheme can not only improve the throughput but
also reduce the delay with negligible overhead and satisfy the QoS
requirements.
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Seminar Report Bandwidth Recycling
System Requirements
Hardware Requirements:
PROCESSOR : PENTIUM IV 2.6 GHz
RAM : 512 MB DD RAM
MONITOR : 15” COLOR
HARD DISK : 20 GB
FLOPPY DRIVE : 1.44 MB
CDDRIVE : LG 52X
KEYBOARD : STANDARD 102 KEYS
MOUSE : 3 BUTTONS
Software Requirements:
Front End : Java, Swing
Back End : MS Access
Tools Used : Eclipse 3.3
Operating System : WindowsXP/7
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