Mobility Management in IEEE 802.16e-based Wireless Metropolitan Area Networks;Handover management in Mobile IPv6 based wireless networks.

Mobility Management in IEEE 802.16e-based Wireless Metropolitan Area Networks;Handover management in Mobile IPv6 based wireless networks.

Abstract: Mobility Management.

The IEEE 802.16 (WiMAX) technology, both in its IEEE 802.16d (Fixed WiMAX) and IEEE 802.16e (Mobile WiMAX) versions, is regarded as a very promising broadband access technology for the Fourth Generation (4G) broadband Wireless Metropolitan Area Networks (WMANs). It successfully addresses the requirements of higher data rate and efficient spectral efficiency for provisioning of full-fledged mobile broadband access. The introduction of mobility management framework in the WiMAX family of standards has set this technology as a strong contender for existing and forthcoming networks, in terms of providing ubiquitous computing solutions for multimedia applications. Mobility related research in WiMAX is mostly focussed on the two main areas of concern: location management and handover management. Our current work deals with the latter. A handover occurs when a Mobile Station (MS) under the control of a serving base station (SBS) moves through the cellular boundary to a different cell served by a different Base Station (BS). Mobile WiMAX defines three different types of handover techniques, namely hard handovers, fast base station switching and the macro-diversity handovers. While hard handover, the default scheme, is a “break before make” procedure in which there is a connection disruption in between the old and the new connection, the other two belong to “make before break” schemes. The hard handover scheme suffers from excessive scanning related drawbacks, which accounts to almost 50% of the overall handover latency in WiMAX. Recently proposed modifications of this scheme are mostly BS-controlled and MS-assisted. However, in case of a mobility scenario where the BSs are fixed, it would be more appropriate to have a handover scheme that is fully MS-controlled. Our current research work is focussed on proposing a procedure in which an MS can self-track its own mobility pattern relative to the neighbouring base stations (NBS), by considering the received signal strengths from the different BSs. This would reduce the scanning and ranging activity of the MS while selecting the target BS facilitating a fast WiMAX handover. This talk would give an overview of such a thought-of framework.

Abstract: Handover Management.

Mobile IPv6 (MIPv6) is an under development standard from the Internet Engineering Task Force (IETF). It is developed to overcome MIPv4's address shortage problem and deficiencies in data transmission. In a wireless network, transferring and ongoing call or data session from one channel connected to the core network to another is known as handover of handoff. During the process, packet loss or connection loss usually occurs. Due to this reason, MIPv6 based wireless networks are still not adaptable for many real time sensitive applications. This seminar surveys through existing proposed standards and solutions for the handover management. A new solution will also be presented. The improvement will be demonstrated in a simple mathematical way.