{"created":"2023-05-15T08:43:31.869137+00:00","id":8530,"links":{},"metadata":{"_buckets":{"deposit":"bb08952c-cb2d-4ee4-b264-1a7c4417d47f"},"_deposit":{"created_by":3,"id":"8530","owners":[3],"pid":{"revision_id":0,"type":"depid","value":"8530"},"status":"published"},"_oai":{"id":"oai:uec.repo.nii.ac.jp:00008530","sets":["9:10"]},"author_link":["23296"],"control_number":"8530","item_10006_alternative_title_1":{"attribute_name":"その他（別言語等）のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"TDMAとDCFの組み合わせによるアドホックネットワーク上でのQoS通信の実現方式","subitem_alternative_title_language":"ja"}]},"item_10006_date_granted_11":{"attribute_name":"学位授与年月日","attribute_value_mlt":[{"subitem_dategranted":"2017-03-24"}]},"item_10006_degree_grantor_9":{"attribute_name":"学位授与機関","attribute_value_mlt":[{"subitem_degreegrantor":[{"subitem_degreegrantor_name":"電気通信大学"}],"subitem_degreegrantor_identifier":[{"subitem_degreegrantor_identifier_name":"12612","subitem_degreegrantor_identifier_scheme":"kakenhi"}]}]},"item_10006_degree_name_8":{"attribute_name":"学位名","attribute_value_mlt":[{"subitem_degreename":"博士（工学）"}]},"item_10006_description_10":{"attribute_name":"学位授与年度","attribute_value_mlt":[{"subitem_description":"2016","subitem_description_type":"Other"}]},"item_10006_description_7":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"An ad hoc network does not rely on the fixed network infrastructure; it uses a distributed network management method. With the popularity of the smart devices, ad hoc network has received more and more attention, supporting QoS in ad hoc network has become inevitable. Many researches have been done for provision of QoS in ad hoc networks. These researches can be divided into three types.\n　The first type is contention-based approach which is the most widely used. IEEE 802.11e MAC (media access control) protocol belongs to this type which is an extension of IEEE 802.11 DCF(Distributed Coordination Function). It specifies a procedure to guarantee QoS by providing more transmission opportunities for high priority data. However, since IEEE 802.11eis designed based on the premise that access points are used, when the number of QoS flows increases, packet collisions could occur in multi-hop ad hoc network.\n　The second type is using TDMA-based approach. The TDMA approach can provide contention-free access for QoS traffics through the appropriate time slot reservation. The current TDMA approaches reserve time slots for both QoS traffics and best-effort traffics. However, it is difficult for TDMA as the only approach to allocating channel access time for best-effort traffics sincet he required bandwidth of the best-effort traffics changes frequently.\n　We propose a QoS scheme, which takes advantage of both contention-based approach and TDMA-based approach. In the proposed scheme, contention-based approach DCF provides easy and fair channel time for best-effort traffics, and TDMA approach serves the QoS traffics. A time frame structure is designed to manage the bandwidth allocation. A time frame is divided into two periods, specifically the TDMA periods and the DCF periods. The proportion of two periods is decided by QoS traffics. Therefore the QoS traffics are given absolutely higher priority than best-effort traffics. In order to guarantee the transmission of each QoS packet in TDMA period, a time slot assignment algorithm based on QoS data rate has been proposed. The proposed scheme also employs an admission control scheme, which rejects the new QoS user when the channel capacity is reached. In addition, we provide the configuration of the proposed scheme in the mobile environment. The procedures are designed for route changes and new-adding users. \n　The proposed scheme is simulated in the QualNet simulator. In the static environment, the performance of the proposed scheme is evaluated in the case of a gradual increase in the number TCP flows and in the case of gradual increase in QoS data rate. Simulation results show that in the static environment the proposed scheme can not only provide effective QoS performance, but also can provide good support for best-effort flows. In the mobile environment, we simulated the performance of the proposed scheme at different moving speed (maximum is 5 Km/h) when the ARF (Auto Rate Fallback) is available. From the simulation results, in a specific mobile environment, the proposed scheme can support the QoS transmission well.","subitem_description_type":"Abstract"}]},"item_10006_dissertation_number_12":{"attribute_name":"学位授与番号","attribute_value_mlt":[{"subitem_dissertationnumber":"甲第902号"}]},"item_10006_text_22":{"attribute_name":"専攻","attribute_value_mlt":[{"subitem_text_value":"情報システム学研究科"},{"subitem_text_value":"情報ネットワークシステム学専攻"}]},"item_10006_text_23":{"attribute_name":"学術成果タイプ","attribute_value_mlt":[{"subitem_text_value":"博士学位論文"}]},"item_10006_version_type_18":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"open access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_abf2"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"林, 晶","creatorNameLang":"ja"},{"creatorName":"リン, ショウ","creatorNameLang":"ja-Kana"},{"creatorName":"Lin, Jing","creatorNameLang":"en"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2017-04-24"}],"displaytype":"detail","filename":"1462005.pdf","filesize":[{"value":"3.3 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"1462005.pdf","url":"https://uec.repo.nii.ac.jp/record/8530/files/1462005.pdf"},"version_id":"494e34ac-ca25-4aea-887c-bb4153a30791"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"doctoral thesis","resourceuri":"http://purl.org/coar/resource_type/c_db06"}]},"item_title":"A Study on Provision of QoS Services over Ad Hoc Networks by Combining TDMA and DCF Access Methods","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"A Study on Provision of QoS Services over Ad Hoc Networks by Combining TDMA and DCF Access Methods","subitem_title_language":"en"}]},"item_type_id":"10006","owner":"3","path":["10"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2017-03-24"},"publish_date":"2017-03-24","publish_status":"0","recid":"8530","relation_version_is_last":true,"title":["A Study on Provision of QoS Services over Ad Hoc Networks by Combining TDMA and DCF Access Methods"],"weko_creator_id":"3","weko_shared_id":-1},"updated":"2024-02-01T06:38:32.464976+00:00"}