Interworking of 3G cellular networks and wireless LANs.

International Journal of Wireless and Mobile Computing 01/2007; 2:237-247. DOI: 10.1504/IJWMC.2007.016718
Source: DBLP

ABSTRACT The Third Generation (3G) cellular networks provide ubiquitous connectivity but low data rates, whereas Wireless Local Area Networks (WLANs) can offer much higher data rates but only cover smaller geographic areas. Their complementary characteristics make the integration of the two networks a promising trend for next-generation wireless networks. With combined strengths, the integrated networks will provide both wide-area coverage and high-rate data services in hotspots. There are many aspects involved in their interworking, such as mobility, security and Quality of Service (QoS) provisioning. In this paper, we present a survey of most recent interworking mechanisms proposed in the literature, and outline some important open issues to achieve seamless integration.

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    ABSTRACT: In this paper, we investigate uplink resource allocation for wireless local area network and cellular network interworking to provide multi-homing voice and data services. The problem is formulated based on the physical layer and medium access control layer technologies of the two networks to ensure that the resource allocation decisions are feasible and can be executed at the lower layers. Furthermore, to efficiently utilize users' equipment (UEs) battery power, the power distribution among multiple network interfaces of the UEs is included in the problem formulation. The optimal resource allocation problem is a multiple time-scale Markov decision process (MMDP) as the two networks operate at different time-scales and due to voice and data service requirements. We derive decision policies for the upper and the lower levels of the MMDP by decomposing each resource allocation problem over multiple time slots to a set of resource allocation problems for individual time slots and solving the resource allocation problems corresponding to individual time slots using convex optimization techniques. To reduce the time complexity, we further propose a heuristic resource allocation algorithm by deriving the decision policies based on a single system state. The system state consists of average square channel gains for dual variable calculation and instantaneous channel gains for resource allocation based on the calculated dual variables. Simulation results demonstrate the achievable throughput and service quality improvements by employing these two algorithms.
    IEEE Transactions on Communications 08/2014; 62(8):2773-2789. DOI:10.1109/TCOMM.2014.2337890 · 1.98 Impact Factor
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    ABSTRACT: To provide seamless internet connectivity anywhere at any time to the mobile users, there is a strong demand for the integration of wireless access networks for all-IP based Next Generation Networks (NGNs). To support heterogeneous networking environment, a dual mode user terminal is required to support all access networks which are gathered to build the integrated unified network. Several research proposals build their integrated network on tight coupling mechanism and the treatment of the handover latency was taken as the prime factor. However, because of the flexibility and independence of deployment a loose coupling architecture has been preferred in this research effort. Moreover, this paper focuses on the design and evaluation of our Dual Mode Mobile Terminal (DMMT). The DMMT operates under the coverage of UMTS and WLAN radio access networks. The DMMT contains a software layer called Convergence Layer (CL) that provides the intelligence to switch the ongoing sessions between the UMTS and WLAN networks. The simulation results demonstrate that the straightforwardness of the proposed DMMT when using with a loosely coupled integrated network leads to the performance enhancements. Enhanced performance of data services such as low packet delay variation and download response time, high received traffic and downloaded objects make it an optimal choice for the NGN.
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    ABSTRACT: To improve the interworking between LTE and WiFi wireless technologies, an efficient handover mechanism is proposed. Dynamic and critical measures like mobile-assisted parameters are inserted to the Access Network Discovery and Selection Function (ANDSF) entity defined by 3GPP standard. Moreover, Context Aware (CA) decision algorithm is integrated within the ANDSF server so that the inserted measurements are expeditiously invested to improve the handover decision policy. The performance enhancement of the proposed model compared to the traditional one is shown by numerical simulations.
    2013 25th International Conference on Microelectronics (ICM); 12/2013


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