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پروژه Efficient hierarchical SIP mobility management for WiMAX networks با NS2
Efficient hierarchical SIP mobility management for WiMAX networks
چکیده مقاله:
By adopting Session Initiation Protocol (SIP) in WiMAX networks, when the mobile node (MN) moves to a foreign network, the MN sends a re-INVITE message to the corresponding node (CN) to re-establish the connection. This re-connection time is the most costly factor for a handoff. To effectively reduce the re-connection latency, a hierarchical SIP (HSIP) mobility management incorporated with MAC layer operations is proposed. As proposed in the HSIP architecture, several Base Stations (BSs) are collectively managed by an HSIP server to form an administration domain. When an MN roams within a domain, which is the most common mobility case, a re-INVITE message is not necessary, hence a significant traffic reduction can result. To demonstrate the applicability of the proposed HSIP mobility mechanism, an evaluation using the NS2 simulator was performed. Handoff delay and signaling overhead are investigated in both single-handoff and multiple-handoff occurrences. When the ratio of intra-domain to inter-domain handoffs is increased from 1 to 14, the proposed HSIP mobility mechanism can improve up to 13% in average handoff delay and 35% in average signaling overhead as compared with traditional SIP mobility management.
Keywords: Mobility management, WiMAX, Handoff, Session initiation protocol, Hierarchical session initiation protocol
http://www.sciencedirect.com/science/article/pii/S0898122112003434
Introduction:
The maturity of IEEE 802.11 technology and its low setup cost has enabled it to be successfully applied to WiFi (Wireless Fidelity) networks. Many cities have now set up wireless network access points to offer users the convenience of alwayson Internet [1]. The technology’s limited coverage and scalability, however, have limited wireless Internet access to specific areas. The specification of the IEEE 802.16 [2] WiMAX (Worldwide Interoperability for Microwave Access) standard provides for coverage of up to 40 miles and a transfer rate of up to 70 Mbps. The superior coverage and scalability means that it will gradually become the network technology of choice for future IP-based mobile communications networks. Two fundamental standards are supported by IEEE 802.16. One is IEEE 802.16-2004, used for fixed wireless services, and the other is IEEE 802.16e [4], used for mobile communications. Users can either directly connect to the Base Station (BS) or indirectly connect to the BS through a Subscriber Station (SS).
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