Mid-Session Macro-Mobility in IMS-Based Networks

Renier, Thibault Julien; Larsen, Kim Lynggarg; Castro, Guzmán; Schwefel, Hans-Peter

doi:10.1109/mvt.2007.898098

Cited by 36 publications

(31 citation statements)

References 4 publications

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“…For the handoff control, there have been many researches on optimizing the handoff signaling flows in order to reduce the handoff delay [8,9,11,15]. The work in [8] introduces the approach to share the registration information and call states for supporting IMS macro mobility (UE changes IP address).…”

Section: Related Workmentioning

confidence: 99%

“…The work in [8] introduces the approach to share the registration information and call states for supporting IMS macro mobility (UE changes IP address). Nilanjan et al [9] introduce a SIP-based architecture to support soft handoff for IP-centric wireless networks.…”

Section: Related Workmentioning

confidence: 99%

“…The work in [8] only saves a part of the registration and session setup delay, and the soft handoff [9] and fast handoff [13,14] all introduce B2BUA entities that may result in media transmitting congestion. Therefore, to reduce handoff delay, QoS negotiation along with resource reservation in the new access network during the session reestablishment should be performed in advance.…”

Section: The Computer Journal 2009mentioning

confidence: 99%

“…Then it can exchange SIP messages in the application layer, either directly or through a gateway, independent of the underlying network-access technology. The actual type of access network is not important for the IMS, but the IMS expects that mobility can be handled in the access network [8]. In other words, if the UE's IP address changes, the ongoing session has to be terminated and the long standard SIP-based session setup procedures have to be performed once more in the new IMS network [13].…”

Section: Ims Handoff Proceduresmentioning

confidence: 99%

“…Recently, some significant efforts, the improving of handoff signaling [8][9][10][11] and the proposals of cross-layer protocol [12][13][14] have been underway to decrease handoff signaling delay; also some advance resource reservation algorithms [4,15,16] are proposed to reduce the reservation delay. Nevertheless, the current architectures to optimize handoff management in IMS mainly involve the following three shortcomings.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced IMS Handoff Mechanism for QoS Support over Heterogeneous Network

Liao¹,

Qi²,

Zhu³

et al. 2009

The Computer Journal

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IP multimedia subsystem (IMS) is over IP network architecture, but mobile IP cannot directly support session mobility controlled by session initiation protocol-based signaling. The long signaling delay for session reestablishment in application layer always results in session interruptions during the handoff. Therefore, handoff poses a challenge for quality of service (QoS) maintenance in IMS that targets to offer real-time multimedia applications over wireless mobile networks. The existing approaches to solve this problem depend on the advance resource reservation and the optimization of handoff control. Unfortunately, big cost of the advance resource reservation in neighboring domains is a major problem that leads to a serious signaling load and a waste of wireless bandwidth. To solve this issue, we present an enhanced IMS handoff mechanism (EHM) based on user mobility prediction to save network resources by avoiding multiple useless advance reservations. In addition, to support the heterogeneous access networks in IMS domain, EHM evolves a network selective scheme to utilize the network resources more efficiently. The architecture of EHM and the advance QoS negotiation signaling are also presented. We model the cost, the handoff delay and the session blocking probability for EHM and the previous work. Analytical and simulation results show that EHM can enhance the handoff performance, such as reducing resource reservation cost greatly, decreasing session reestablishment delay and making good use of multiple access network resources.

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Section: Related Workmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

Section: The Computer Journal 2009mentioning

confidence: 99%

Section: Ims Handoff Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhanced IMS Handoff Mechanism for QoS Support over Heterogeneous Network

Liao¹,

Qi²,

Zhu³

et al. 2009

The Computer Journal

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Mobile‐initiated network‐executed SIP‐based handover in IMS over heterogeneous accesses

Chiang

Chang

2010

Int J Communication

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SUMMARYThe services of next generation networks are envisioned to be potentially capable of seamless mobility in spite of the heterogeneity in underlying access technologies. It is undoubted that to accomplish seamless services across heterogeneous networking environments gets harder in case of simultaneous mobility. In this article, we propose a mobile-initiated network-executed (MINE) session initial protocol (SIP)-based handover mechanism to facilitate simultaneous mobility in IP multimedia subsystem over heterogeneous accesses. The novelty of the proposed approach is that no changes are required to the existing network infrastructure since handover decision is fully made by the mobile host (MH) and handover execution is performed by a new-added application server called mobility server (MS). When the MH decides to initiate a handover and obtains a new IP address, it will send a SIP Publish message to trigger the MS to carry out the handover execution. With the network-executed design of the MINE, the MS can perform third-party registration for security re-association and third-party call control for session re-establishment in parallel. Moreover, the Master-Slave Determination procedures derived from H.245 are used in the MS to handle fairly the racing conditions resulting from simultaneous mobility such that redundant message flows are eliminated. Mathematical analyses present that the MINE can shorten the handover latency and reduce power consumption, as observed from a comparison with the integrated solution of an optimized macro-mobility mechanism and a receiver-side simultaneous mobility approach.

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