Connection Admission Control for Multiservice Integrated Cellular/WLAN System

Abstract

Abstract-The complementary characteristics of wireless cellular networks and wireless local area networks (WLANs) make them suitable to jointly offer seamless wireless access services to mobile users. In an integrated cellular/WLAN system, the quality of service (QoS) requirements for different services (e.g., voice, real-time video) require admission control to limit the number of connections in each access network. In this paper, we first develop an analytical model to facilitate the evaluation of different admission control policies in a multi-service integrated cellular/WLAN system. We then formulate two different revenue maximization problems. Each problem takes different QoS requirements into account. By solving the equivalent cost minimization problems, we evaluate the system performance when different combinations of cutoff priority and fractional guard channel admission control policies are being used. Results show that using cutoff priority policy in both wireless access networks can achieve the optimal solution for the two optimization problems under a wide range of network conditions.

A context-aware framework for the efficient integration of femtocells in IP and cellular infrastructures

“…The proposed CA-FEI framework can be considered as complementary to [12], which presents a scheme for dynamic service-level agreement negotiation between the ISP provider and the femtocell operator, aiming to tackle the problem of xDSL line's varying capacity. In general, our proposed scheme adopts a hybrid partitioning policy [13] and can be classified within the family of admission control schemes designed for the integration of heterogeneous networks, such as [14][15][16][17]. However, such schemes are not directly applicable in our case as either (a) they consider significantly different system models, which in most cases include networks that have their own separate links to the core network or (b) they support basic QoS features that are not compatible with the strict QoS requirements of a femtocell.…”

Admission control policy for adaptive multirate multiservices in cellular systems

“…Therefore, handover requests have a higher priority than new requests, so it is necessary that β n is ðm i Þ≥β hh i st ðm i Þ for all i 2 M and s 2 S. This section introduces the policy function concept and derives the corresponding functions for CAC policy. Stevens-Navarro et al [7] showed that, under a wide range of connection request rates and various user mobility levels, the application of a CP policy in both access networks provided the best performance with both design objectives. Therefore, this study uses CP policy functions for CAC.…”

“…They assume that all arriving connections request the same amount of bandwidth. Therefore, CAC schemes have been proposed for multiservice wireless networks by Chao and Chen [6], Stratogiannis et al [2], and Stevens-Navarro et al [7].…”

“…Stevens-Navarro et al [7] evaluated four different combinations of CAC policy by extending the CP and FG admission control policy with policy functions. Applying the CP policy to both access networks achieved the best performance given a wide range of connection request rates and various user mobility levels.…”

Call admission control with heterogeneous mobile stations in cellular/WLAN interworking systems

“…Extensive work has been done in the integration of heterogeneous networks [2][3][4][5][6][7][8][9] and to allow seamless mobility across these heterogeneous networks (i.e., vertical handoff), two integration architectures, having both tightly coupled and loosely coupled architectures, have been introduced in [2,3]. In [4,5], vertical handover decisions where an mobile station (MS) selects the most appropriate network to avoid unnecessary handovers and wastages of resource have been proposed.…”