{"created":"2021-03-01T06:21:33.027936+00:00","id":4870,"links":{},"metadata":{"_buckets":{"deposit":"4c094040-f9fc-41df-8ebc-b2756b2519f2"},"_deposit":{"id":"4870","owners":[],"pid":{"revision_id":0,"type":"depid","value":"4870"},"status":"published"},"_oai":{"id":"oai:repository.dl.itc.u-tokyo.ac.jp:00004870","sets":["6:209:271","9:233:234"]},"item_7_alternative_title_1":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"A proposal and evaluation of priority control method to increase the number of flows within response time threshold"}]},"item_7_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2013-03-25","bibliographicIssueDateType":"Issued"},"bibliographic_titles":[{}]}]},"item_7_date_granted_25":{"attribute_name":"学位授与年月日","attribute_value_mlt":[{"subitem_dategranted":"2013-03-25"}]},"item_7_degree_name_20":{"attribute_name":"学位名","attribute_value_mlt":[{"subitem_degreename":"修士(工学)"}]},"item_7_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"通信ネットワークにおいて，複数のフローが限られた帯域幅を共有することによって通信遅延が増大する問題がある．特に，同一のアクセスポイントに多数の無線端末が接続する無線LAN環境では，こうした問題への対処が重要である．本論文では，無線LAN混雑時のWEB閲覧環境において，レスポンスタイムが閾値以下となるフロー数の増大を目指した方式を提案している．提案方式では，アクセスポイントにおいて各フローの通信経過時間やデータ通信量を把握することで一定時間内に通信を完了するのに必要な帯域使用率を算出し，それに基づく優先制御を行う．提案方式をQualNetによって評価したところ，優先制御を行わないとレスポンスタイムが閾値以下となるフロー数が30%以下に減少する混雑環境でも，割合を2倍以上に増加させることができることが明らかとなった．","subitem_description_type":"Abstract"},{"subitem_description":"Multiple data flows sharing limited bandwidth cause communication delay in communication networks. In particular it is important to deal with such a problem in the wireless LAN environments, since many terminals associate with the same access point within limited time span. In this thesis, a method to increase the number of flows within response time threshold in congested wireless LAN is proposed. The method controls flow priority by calculating the bandwidth utilization ratio required to complete the download within certain time threshold. The ratio value is obtained through monitoring the transmitted data and elapsed time of transmission. In regular environment, where priority method is not applied, the ratio of flows completing the transmission within the threshold is below 30% of the total number of flows. According to the QualNet simulation results, the proposed priority method doubles this ratio.","subitem_description_type":"Abstract"}]},"item_7_select_21":{"attribute_name":"学位","attribute_value_mlt":[{"subitem_select_item":"master"}]},"item_7_text_24":{"attribute_name":"研究科・専攻","attribute_value_mlt":[{"subitem_text_value":"工学系研究科・電気系工学専攻"}]},"item_7_text_4":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"東京大学大学院工学系研究科電気系工学専攻"},{"subitem_text_value":"Department of Electrical Engineering and Information Systems, Graduate School of Engineering, The University of Tokyo"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"石川, 圭也"}],"nameIdentifiers":[{"nameIdentifier":"10574","nameIdentifierScheme":"WEKO"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2017-06-01"}],"displaytype":"detail","filename":"37116418.pdf","filesize":[{"value":"2.0 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"37116418.pdf","url":"https://repository.dl.itc.u-tokyo.ac.jp/record/4870/files/37116418.pdf"},"version_id":"31d929c1-42e6-4dea-b39d-a7e359ed05d0"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"thesis","resourceuri":"http://purl.org/coar/resource_type/c_46ec"}]},"item_title":"閾値内レスポンスタイムのフロー数を増加させる優先制御方式の提案と評価","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"閾値内レスポンスタイムのフロー数を増加させる優先制御方式の提案と評価"}]},"item_type_id":"7","owner":"1","path":["234","271"],"pubdate":{"attribute_name":"公開日","attribute_value":"2013-05-07"},"publish_date":"2013-05-07","publish_status":"0","recid":"4870","relation_version_is_last":true,"title":["閾値内レスポンスタイムのフロー数を増加させる優先制御方式の提案と評価"],"weko_creator_id":"1","weko_shared_id":null},"updated":"2022-12-19T03:46:32.337930+00:00"}