Achieving seamless mobility in IP-based radio access networks

SIP-based proactive and adaptive mobility management framework for heterogeneous networks

“…To date, many mobility management schemes have been proposed to address seamless handover focusing on intelligent selection of APs and maintaining session continuity, where each scheme employs a different handover strategy (Jayaram and Sreenivasulu, 2006;Cho and Kim, 2005;Wang and Bao, 2005;Dutta et al, 2004Dutta et al, , 2005Puttonen et al, 2005;Guo et al, 2004Guo et al, , 2005Banerjee et al, 2003;Akhtar et al, 2003;Sharma et al, 2004;Pahlavan et al, 2000;Bi et al, 2004;Sundaresan and Papagiannaki, 2006;Leggio et al, 2005). In general, these schemes could be categorized into the traditional and the advanced mobility management schemes based on a few factors.…”

“…From the literature, faster handover is made possible by delivering both data and contextual information to the new point of attachment prior actual handover execution. Seamoby Working Group is focusing on context transfer (Leggio et al, 2005) as to reduce the handoff time. This is done by transferring the information related to the mobile node from the current access router to the next access router over the wired network, avoiding using the limited wireless bandwidth resources.…”

An agent-based architecture for fast context transfers during handoffs

“…The main idea behind context transfer is that by transferring the information associated with a MT (the context) before or immediately after handoff execution can be helpful in improving handoff performance. The context is transferred from the Current Access Router (CAR) to the New Access Router (NAR) over the wired network, avoiding the use of limited wireless bandwidth resources (Leggio et al, 2005). The types of contexts to be transferred may include Authentication, Authorisation and Accounting (AAA) parameters, header compression state, and Quality of Service (QoS) parameters (Kempf, 2002).…”

“…In reactive context transfers, the NAR receives the CTAR message from the MT that includes the IP address of the old Access Router and the information about the contexts to be transferred. The NAR sends a Context Transfer Request (CTR) message to the old Access Router, which replies with a CTD message and starts the transfer of context information (Leggio et al, 2005). Figure 1 shows the signalling exchange for MobileNode-initiated predictive context transfer.…”

QoS provision in wireless access networks: a routing perspective considering mobility

“…A user profi le based DiffServ proposal considering location, history, speed and direction as well as the mobile host (MH) resource requirements presented in Pandey et al [6] regulates the QoS delivered by different classes and maximizes the overall performance. A protocol for discovering the 'best' access router among several options based on the MH QoS requirements is proposed in Leggio et al [7], where a context transfer protocol is also employed to transfer QoS information to reduce handover disruption. Although such proposals attempt to safeguard the QoS of ongoing sessions, they do not utilize network resources effi ciently, wasting feasible non-shortest paths.…”