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題 名 | GPRS/UMTS網路之智慧型GGSN分派演算法=An Intelligent GGSN Dispatching Algorithm for GPRS/UMTS Networks |
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作 者 | 塗冠驊; 顏在賢; 沈怡瑄; 林風; 傅立成; | 書刊名 | 國立臺灣大學工程學刊 |
卷 期 | 90 2004.02[民93.02] |
頁 次 | 頁49-56 |
專 輯 | 資訊工程專輯 |
分類號 | 448.84 |
關鍵詞 | 第三代行動通訊系統; 整合封包無線電服務; 通用行動通訊服務; APN; GGSN; PDP context; UMTS; |
語 文 | 中文(Chinese) |
中文摘要 | 在整合封包無線電服務(General Packet Radio Service,GPRS)及通用行動通訊服務(Universal Mobile Telecommunication system,UMTS)中,任一種網路應用(例如VoIP或WAP等)皆對應到各自的存取點名稱(Access Point Name,APN)。在啟動一個網路應用之前,無線裝置 (Mobile Station,MS) 必須在其所服務的GPRS支援節點(Serving GPRS Support Node,SGSN)及一可提供該服務的GPRS閘道支援節點(Gateway GPRS Support Node,GGSN) 之間啟動PDP context建立程序(PDP context Activation Procedure)。在此,PDP context為在GPRS/UMTS內部網路中繞送封包時所需的路由資訊。當啟動PDP context建立程序時,SGSN會依照MS所啟動的服務,來選擇一適當的APN來服務使用者,再尋找一個合適的GGSN服務該使用者。根據所對應的APN,SGSN可以查詢網域名稱伺服器(Domain Name Server,DNS),以提供一組合適的GGSN位址。SGSN則選擇一個GGSN以開始建立PDP context。若該GGSN不接受其建立PDP context之請求,則SGSN會繼續選擇其它GGSN。如此一來有可能造成了網路產生許多不必要的訊息及增加額外的等待時間。在本文中,我們將提供一個智慧型之GGSN分派演算法 (Intelligent GGSN Dispatching Algorithm,IGDA),以排程GGSN供SGSN作選取。在此研究所提供的結果中,IGDA可以很明顯的減少在啟動PDP context建立程序之訊息的傳送次數,以提供較好的系統效能。 |
英文摘要 | In General Packet Radio Service (GPRS) and Universal Mobile Telecommunication System (UMTS) networks, each service (e.g., VOIP, WAP) is referred to as Access Point Name (APN). Before accessing a service, the Mobile Station (MS) has to perform PDP context activation procedure [1] to activate PDP contexts to the Serving GPRS Support Node (SGSN) and a specific Gateway GPRS Support Node (GGSN), which can support the service. The PDP context is used by GGSN to tunnel the packets of the attached MS to the corresponding SGSN or to external data network. To find a suitable GGSN to serve the mobile user, the MS has to indicate the APN to the SGSN when PDP context activation procedure is initiated. By this APN, SGSN can query the Domain Name Server (DNS) for an inventory recording suitable GGSNs’ addresses. Then, SGSN chooses a GGSN from the inventory in sequence and issues a request of activating a PDP context. If the GGSN does not accept the request, the SGSN has to choose another GGSN until the inventory is exhausted. In this paper, we propose an Intelligent GGSN Dispatching Algorithm (IGDA) to generate a scheduled inventory for SGSN to choose the most suitable GGSN for the MS. Our study indicates that the IGDA mechanism could significantly reduce the number of signaling messages, which are initializing a service. |
本系統中英文摘要資訊取自各篇刊載內容。