Abstract
Next generation mobile networks aim to provide faster speed and more capacity along with energy efficiency to support video streaming and massive data sharing in social and communication networks. In these networks, user equipment has to register with IP Multimedia Subsystem (IMS) which promises quality of service to the mobile users that frequently move across different access networks. After each handover caused due to mobility, IMS provides IPSec Security Association establishment and authentication phases. The main issue is that unnecessary reregistration after every handover results in latency and communication overhead. To tackle these issues, this paper presents a lightweight Fast IMS Mobility (FIM) registration scheme that avoids unnecessary conventional registration phases such as security associations, authentication, and authorization. FIM maintains a flag to avoid deregistration and sends a subsequent message to provide necessary parameters to IMS servers after mobility. It also handles the change of IP address for user equipment and transferring the security associations from old to new servers. We have validated the performance of FIM by developing a testbed consisting of IMS servers and user equipment. The experimental results demonstrate the performance supremacy of FIM. It reduces media disruption time, number of messages, and packet loss up to 67%, 100%, and 61%, respectively, as compared to preliminaries.
Highlights
Generation mobile networks (NGMNs) provide faster speed and wide capacity for outdoor and indoor multimedia based applications in affordable rates for supporting large set of customers
User equipment (UE) monitors the signaling strength of Access Point (AP), and when the exponential smoothing value of the strength (St = aSt−1 + (1 − a)at, 0 ≤ a ≤ 1) goes below the threshold value, UE connects to new AP with strong signal strength, where at is signaling strength of AP at time t and St is the result at time t and a = 0.5 in the experiment as in [11]
We have performed a number of handovers that can be categorized in three scenarios including Same Proxy-Call Session Control Function (P-CSCF) (SP), Other Far P-CSCF (OFP), and Other Near P-CSCF (ONP) as discussed below
Summary
Generation mobile networks (NGMNs) provide faster speed and wide capacity for outdoor and indoor multimedia based applications in affordable rates for supporting large set of customers. Some of the existing reregistration schemes proposed in the literature [7, 9, 10] strived to reduce the number of messages and media disruption time (MDT), that is, time during which service is unavailable due to handover. In 3GPP specification, a new entity named service centralization and continuity application server is introduced for service continuity by maintaining long-term session between UE and CN on a new IP address It ensures service continuity but it causes delay during registration phase. We have identified that there is a need to optimize the registration phase with less communication overhead It should cater transfer of IPSec SAs to provide authentication and authorization.
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