Resource Reservation for Self-Similar Data Traffic in Cellular/WLAN Integrated Mobile Hotspots
ABSTRACT As two most popular wireless networks, the third generation (3G) cellular networks and wireless local area networks (WLANs) can be integrated to enhance service provisioning. However, most of the previous studies on cellular/WLAN interworking focus on WLANs in a static indoor environment such as offices, hotels, and cafes. Actually, the two heterogeneous technologies can be integrated to support mobile hotspots, which are usually in and around a moving vehicle, such as a bus, a railway train, and even a flight cabin. Different from traditional single-hop wireless networks, the mobile hotspot can adopt a two-hop relay for wireless access. In this paper, we analyze the delay performance for such a cellular/WLAN integrated mobile hotspot. In particular, we take into account the heavy-tailedness of data file size and self-similarity of aggregate traffic. Based on the analysis, we can determine the cellular channel bandwidth to be reserved for aggregate handoff traffic of the mobile hotspot.
Conference Paper: Dynamic bandwidth allocation in mobile hotspots[Show abstract] [Hide abstract]
ABSTRACT: Resource management in mobile hotspots is an interesting and challenging issue. In this paper, we propose a dynamic bandwidth allocation (DBA) scheme consisted of call admission control and bandwidth adjustment functions to lower handoff vehicle dropping probability and efficiently utilize a resource of a base station. Specifically, a handoff priority scheme with guard bandwidth is employed to protect handoff vehicles. On the other hand, a bandwidth is dynamically assigned to each vehicle exploiting vehicular user movement patterns which are getting on and off patterns at a stop. Simulation results demonstrate that the DBA scheme can guarantee low new vehicle blocking probability and handoff vehicle dropping probability.Wireless Communications & Signal Processing (WCSP), 2012 International Conference on; 01/2012
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ABSTRACT: Focusing on the uplink video transmission over a two-hop mobile network, we analyze the video performance in terms of packet loss probability and packet delay distribution. The burst arrival nature and strong correlation of video traffic are taken into account by using a discrete-time batch Markovian arrival process. The impact of packet transmissions between the two hops is investigated by properly modelling the packet departure process of the first hop. To address a strict delay constraint for video services, we consider a buffer size limit in the first hop and a proactive packet discard policy in the second hop. Numerical results based on video traces demonstrate the effectiveness of the proposed analytical approach.IEEE Wireless Communication Letters 04/2012; 1(2). DOI:10.1109/WCL.2012.022412.110252
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ABSTRACT: In this paper, we propose a mobility-aware call admission control (MA-CAC) algorithm with a handoff queue (HQ) in mobile hotspots, where different admission control policies are employed, depending on the vehicle mobility. Specifically, when a vehicle is static, a handoff priority scheme with guard channels is studied to protect vehicular handoff users because handoff users may get on the vehicle. In addition, an HQ is examined during stopping to further accept handoff users. On the other hand, for a moving vehicle, no guard channels for handoff users are allocated to maximize channel utilization. By means of Markov chains, we evaluate MA-CAC with an HQ in terms of new-call blocking probability (NCBP), handoff-call dropping probability (HCDP), handoff-call waiting time in the HQ, and channel utilization. Analytical and simulation results demonstrate that MA-CAC with an HQ can lower both the HCDP and the NCBP while maintaining high channel utilization.IEEE Transactions on Vehicular Technology 10/2013; 62(8):3903-3912. DOI:10.1109/TVT.2013.2245928 · 2.64 Impact Factor