Intelligent mobile terminals (or users) of next generation wireless networks are expected to initiate voice over IP (VoIP) calls using session set-up protocols like H.323 or SIP (session initiation protocol). To guarantee service quality of such applications, the call set-up protocol should be robust against network impairment generated in wireless networks. In this paper, we analyze the performance of the H.323 call setup procedure over the wireless link. We used two call modes of operation for this analysis namely regular and fast connect. The proposed model assumes that a transparent radio link protocol (RLP), but without RLP retransmission, be used for VoIP packets while non-transparent (regular) RLP be used for H.323 control packets. Our analytical models prove that the VoIP call set-up performance can degrade significantly even for moderately high air-link frame error rates (FER). Furthermore, the call setup performance can be improved significantly using the robust radio link layer such as RLP with the modifications proposed in our paper. The analytical results were validated by our experimental measurements.

We present an adaptive service (or call) admission control algorithm (ASACA) for integrated services packet networks. The proposed algorithm does not require a priori knowledge of the source characteristics, and it consists of two steps. The first step adapts the service rate of the system based on the number of frames lost during the observation period, and the second step estimates the expected delay associated with each class of service upon admitting or rejecting a service in the system. For this purpose, we use an M/M/1 queueing model such that the current statistical delay is added to the error estimates of the delay scaled by its gradient. While admitting a service, we ensure that the delay commitments towards the requirement profile of ongoing services are preserved. Further the sum of the statistical arrival rates for each class of service and the peak rate of the new call is not allowed to exceed the current system service rate. Simulation experiments demonstrate that our adaptive service control algorithm, ASACA, performs twice as well as a non-adaptive algorithm using an M/M/1 model, in meeting the service requirements but at the cost of a reduced number of calls admitted into the system, the number of which depends on the system load.

The advent of powerful hand-held computers and the desire for communication on the move, are the driving forces behind an emerging technology called mobile computing. Observing the growing demands of roaming users, it has been predicted that the next generation wireless networks will be burdened with the bandwidth-intensive traffic generated by personal multimedia applications. However, the available bandwidth for supporting these applications is still limited, and therefore its proper management is necessary to ensure the required quality of service (QoS) provisioning between the end-systems. We first present a survey of the existing literature on the QoS provisioning for wireless networks, which mainly focus on identifying the technological bottlenecks involved. Then we propose a unified framework to provide a link layer as well as a network layer solution for QoS provisioning. Our framework measures two important QoS parameters, namely the inter-packet delay and the transmission data rate. Experimental results show as high as a 21% improvement in the call admission probability and about a 16% improvement in the hand-off call dropping probability.

Article Free Access Share on TCP source activity and its impact on call admission control in CDMA voice/data network Authors: Sanjoy Sen. Jastinder Jawanda Sortel Wireless Networks, 2201 Lakeside Boulevard, Richardson, TX Sortel Wireless Networks, 2201 Lakeside Boulevard, Richardson, TXView Profile , Kalyan Basu Sortel Wireless Networks, 2201 Lakeside Boulevard, Richardson, TX Sortel Wireless Networks, 2201 Lakeside Boulevard, Richardson, TXView Profile , Naveen K. Kakani Center for Research in Wireless Computing (CReW), Department of Computer Science, University of North Texas, Denton, TX Center for Research in Wireless Computing (CReW), Department of Computer Science, University of North Texas, Denton, TXView Profile , Sajal K. Das Center for Research in Wireless Computing (CReW), Department of Computer Science, University of North Texas, Denton, TX Center for Research in Wireless Computing (CReW), Department of Computer Science, University of North Texas, Denton, TXView Profile Authors Info & Claims MobiCom '98: Proceedings of the 4th annual ACM/IEEE international conference on Mobile computing and networkingOctober 1998 Pages 276–283https://doi.org/10.1145/288235.288323Published:25 October 1998Publication History 4citation356DownloadsMetricsTotal Citations4Total Downloads356Last 12 Months6Last 6 weeks2 Get Citation AlertsNew Citation Alert added!This alert has been successfully added and will be sent to:You will be notified whenever a record that you have chosen has been cited.To manage your alert preferences, click on the button below.Manage my AlertsNew Citation Alert!Please log in to your account Save to BinderSave to BinderCreate a New BinderNameCancelCreateExport CitationPublisher SiteeReaderPDF