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Technology is grow rapidly in these recent days. Need for technological applications and high mobility is also increasing. It triggers the development of wireless network technology. Implementation of wireless network that is currently used by people is Wireless Local Area Network (WLAN). Today, WLA...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/16182 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Technology is grow rapidly in these recent days. Need for technological applications and high mobility is also increasing. It triggers the development of wireless network technology. Implementation of wireless network that is currently used by people is Wireless Local Area Network (WLAN). Today, WLAN has a relatively high bandwidth and low cost. One of the topologies of WLAN is Wireless Ad Hoc. In this topology, each device communicates with one another without infrastructure such as Access Point (AP). TCP (Transmission Control Protocol) is one of protocols at the OSI fourth layer which is important in data transmission. TCP Unfairness is frequently reported lately. TCP unfairness is a phenomenon in which TCP flows do not share bandwidth fairly. Unfairness is caused by several factors. First, hidden and exposed terminals. Second, the lack of cooperation between the MAC and TCP. Third, TCP timeouts and backoff. This study aimed to evaluate TCP unfairness in ad hoc wireless networks based on IEEE 802.11. Simulation in this research used OPNET Modeler 14.0. Based on the result of simulation and analysis can be concluded that unfairness is mainly caused by the problem of hidden and exposed terminal. Hidden and exposed terminal makes the MAC sublayer at the node decides to backoff. Connection is not established due to backoff. TCP then assumes that connection that is not established due to timeout that usually caused by congestion. Node that performs backoff then has a lower throughput. |
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