DC Field | Value | Language |
---|---|---|
dc.contributor.author | 전중휘 | en_US |
dc.date.accessioned | 2014-12-01T11:47:41Z | - |
dc.date.available | 2014-12-01T11:47:41Z | - |
dc.date.issued | 2012 | en_US |
dc.identifier.other | OAK-2014-00809 | en_US |
dc.identifier.uri | http://postech.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000001215176 | en_US |
dc.identifier.uri | https://oasis.postech.ac.kr/handle/2014.oak/1311 | - |
dc.description | Master | en_US |
dc.description.abstract | Wireless local area networks (WLANs) based on the IEEE 802.11 standard have been used widely because of its easy accessibility of the WLANs and high data rate with low cost. To avoid collisions, the IEEE 802.11 medium access control (MAC) with distributed coordination function (DCF) uses predetermined inter-frame spaces and the random back-off process. As the physical data rate increases, the channel utilization of MAC becomes low. This is because most of the time is wasted in the back-off state. Moreover, the number of wireless devices sharply increases and the size of data continues to grow. In this environment, the networks become saturated. In saturated networks, collisions and retransmissions frequently occur, aggravating the network throughput.In this paper, we classify collisions into two types based on their causes: selecting an identical back-off count and hidden station problem. For each cause, we propose novel retransmission methods respectively, to increase network performance. In the first proposed retransmission method, a station that experienced collision transmits additional data after a successful retransmission. The second proposed method detects collisions caused by hidden stations and then allows collision-free retransmission. The analysis and simulations results show that the proposed methods provide greater normalized throughput than DCF. Moreover, proposed methods maintain the fairness and provide a shorter average waiting time than existing schemes. | en_US |
dc.language | kor | en_US |
dc.publisher | 포항공과대학교 | en_US |
dc.rights | BY_NC_ND | en_US |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/2.0/kr | en_US |
dc.title | Novel Retransmission Methods based on Collision Types for Wireless LANs | en_US |
dc.title.alternative | 무선랜에서 충돌 유형에 기반한 새로운 재전송 기술에 관한 연구 | en_US |
dc.type | Thesis | en_US |
dc.contributor.college | 일반대학원 컴퓨터공학과 | en_US |
dc.date.degree | 2012- 2 | en_US |
dc.contributor.department | Networking and Distributed Systems Lab., POSTECH | en_US |
dc.type.docType | Thesis | - |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.
library@postech.ac.kr Tel: 054-279-2548
Copyrights © by 2017 Pohang University of Science ad Technology All right reserved.