| Author | Chusak Jangisarakul |
| Call Number | AIT Thesis no.TC-98-02 |
| Subject(s) | Asynchronous transfer mode
|
| Note | A thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering, School of Advanced Technologies |
| Publisher | Asian Institute of Technology |
| Abstract | The Available Bit Rate (ABR) service is intended to support data traffic on ATM
network so that it can peacefully coexist with traffic from the other service classes, such as
Constant Bit Rate (CBR) and Variable Bit Rate (VBR). With the reliable data transport
protocol like Transport Control Protocol (TCP), the performance of TCP over ABR service
should depend on the behavior of ABR scheme with non-ABR traffic.
The congestion control mechanism in ABR service can be classified into two classes.
One is Credit-based control scheme and another is Rate-based control scheme. The
performance of TCP over ABR service with rate-based scheme is the main objective of this
thesis work. With rate-based control scheme, Explicit Rate Indication for Congestion
Avoidance (ERICA+) is selected to implement in this study due to its efficiency. However,
the performance of TCP over ERICA+ is degraded very much from VBR traffic.
Hence, the performances of TCP over ERICA+ with VBR traffic and various
environments are investigated to overcome the limitation of this algorithm. With ERICA+,
the VBR traffic causes low average throughput and a lot of cells dropped. Thus, in this thesis
study the modified version of ERICA+ called Modified ERICA (MERICA+) is proposed to
decrease the number of cells dropped and increase average throughput at the same time. The
basic idea of MERICA+ is to reduce congestion period as soon as possible. Therefore, the
number of cells dropped will be less, meanwhile there are slightly lower average throughput
in some cases. The simulation results indicate that the overall performance of TCP over
MERICA+ is better than ERICA+ in most cases, except in Wide Area network (WAN). |
| Year | 1998 |
| Type | Thesis |
| School | School of Advanced Technologies |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Telecommunications (TC) |
| Chairperson(s) | Erke, Tapio; |
| Examination Committee(s) | Rajatheva, R.M.A.P.; Kanchana Kanchanasut ; |
| Scholarship Donor(s) | Royal Thai Government (RTG) ; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1998 |