Structural properties of optimal coordinate-convex policies for CAC with nonlinearly-constrained feasibility regions

Necessary optimality conditions for Call Admission Control (CAC) problems with nonlinearly-constrained feasibility regions and two classes of users are derived. The policies are restricted to the class of coordinate-convex policies. Two kinds of structural properties of the optimal policies and their robustness with respect to changes of the feasibility region are investigated: 1) general properties not depending on the revenue ratio associated with the two classes of users and 2) more specific properties depending on such a ratio. The results allow one to narrow the search for the optimal policies to a suitable subset of the set of coordinate-convex policies

Handover Management in Highly Dense Femtocellular Networks

For dense femtocells, intelligent integrated femtocell/macrocell network architecture, a neighbor cell list with a minimum number of femtocells, effective call admission control (CAC), and handover processes with proper signaling are the open research issues. An appropriate traffic model for the integrated femtocell/macrocell network is also not yet developed. In this paper, we present the major issue of mobility management for the integrated femtocell/macrocell network. We propose a novel algorithm to create a neighbor cell list with a minimum, but appropriate, number of cells for handover. We also propose detailed handover procedures and a novel traffic model for the integrated femtocell/macrocell network. The proposed CAC effectively handles various calls. The numerical and simulation results show the importance of the integrated femtocell/macrocell network and the performance improvement of the proposed schemes. Our proposed schemes for dense femtocells will be very effective for those in research and industry to implement

A directionally based bandwidth reservation scheme for call admission control

This paper proposes a new advanced Call Admission Control(CAC) strategy involving for the first time, a bandwidth reservation scheme that is influenced by the direction attribute of a mobile terminal (MT). Aside from the Quality-of-Service (QoS) parameters, the direction attribute plays a key role in efficiently reserving resources for MTs supporting multimedia communications for different QoS classes. The framework for a direction-based CAC system is entirely distributed and may be viewed as a message passing system, where MTs inform their neighbouring base stations (BS) not only of their QoS requirements, but also of their mobility parameters. The base stations then predict future demand and reserve resources accordingly, only admitting those terminals that can be adequately supported. The bandwidth reservation scheme proposed in this paper, integrates the direction attribute into the conventional Guard Channel (GC) scheme. Simulation results prove that this new scheme offers significant improvements in both Call Blocking Probability (CBP) and bandwidth utilization, under a variety of differing traffic conditions

QoS Based Capacity Enhancement for WCDMA Network with Coding Scheme

The wide-band code division multiple access (WCDMA) based 3G and beyond cellular mobile wireless networks are expected to provide a diverse range of multimedia services to mobile users with guaranteed quality of service (QoS). To serve diverse quality of service requirements of these networks it necessitates new radio resource management strategies for effective utilization of network resources with coding schemes. Call admission control (CAC) is a significant component in wireless networks to guarantee quality of service requirements and also to enhance the network resilience. In this paper capacity enhancement for WCDMA network with convolutional coding scheme is discussed and compared with block code and without coding scheme to achieve a better balance between resource utilization and quality of service provisioning. The model of this network is valid for the real-time (RT) and non-real-time (NRT) services having different data rate. Simulation results demonstrate the effectiveness of the network using convolutional code in terms of capacity enhancement and QoS of the voice and video services.Comment: 10 Pages, VLSICS Journa

Resource Management of Mobile Communication System

To ensure good traffic handling, channel allocation is one of the important mobile communication resources for quality of service. Usually, three types of channel allocations are widely used: fixed channel allocation, borrowing radio channels from surrounding calls and dynamic channel allocations. In this paper instead conventional channel allocation schemes, we used call admission control (CAC) scheme to combat forced termination (FT). The analytical model of traffic handling in mobile cellular network is implemented by Markov chain; hence the profile of call blocking probability of newly originating call and FT is shown against the call arrival rate and the number of channels. Finally the impact of fading parameters of wireless channel on FT is also analyzed under Rayleigh fading case

ANALISA KINERJA CALL ADMISSION CONTROL PADA SISTEM WCDMA ANALYSIS OF PERFORMANCE CALL ADMISSION CONTROL ON SYSTEM WCDMA

ABSTRAKSI: Dengan semakin bertambahnya jumlah user pada sistem maka interferensi pun semakin meningkat pula. Kapasitas suatu sistem WCDMA sangat tergantung pada interferensi yang terjadi (soft limit). Sehingga diperlukan suatu teknik yang handal untuk membatasi jumlah user pada jaringan yang dapat mengurangi Congestion dan call dropping. Call admission control (CAC) merupakan bagian dari radio resource management (RRM) yang merupakan suatu algoritma yang dilokasikan pada radio access network (RAN). Prinsip kerja CAC yaitu menerima atau tidak suatu panggilan berdasarkan suatu parameter tertentu.Pada penelitian ini membahas mengenai pengaruh Call Admission Control (CAC) terhadap kapasitas dan kualitas layanan meliputi kualitas sinyal, level interferensi, perubahan daya, probabilitas blocking serta delay penerimaan dan delay penolakan pada sistem WCDMA.Hasil penelitian ini menunjukkan bahwa suatu algoritma admission control dapat digunakan untuk menjamin bahwa suatu sistem radio akses beroperasi pada suatu nilai (threshold), dimana suatu radio interface udara digunakan secara penuh (maksimal) dan kualitas layanan (QoS) terhadap user yang sudah ada pada sistem sebelumnya maupun user (panggilan-panggilan masuk) baru tetap terjamin. Untuk Eb/N0 = 5 dB rata-rata user aktif yang dapat ditangani sebesar 92 user 1 sel nya, untuk Eb/N0 = 6 dB dapat menangani 72 user 1 sel nya, Eb/N0 = 5 dB dapat menangani 58 user 1 sel nya, dan Eb/N0 = 2 dB (panggilan handoff) dapat menangani 183 user 1 sel nya. Probabilitas blocking untuk sistem algoritma RCAC ini adalah sebesar 2.13 % = 0,0213 dan probabilitas droppingnya sebesar 1.08 % = 0,0108.Kata Kunci : -ABSTRACT: Increasinglyly increasing of amounts user at system hence interference also increasingly increases also. Capacities a system WCDMA hardly depend on interference happened ( soft limit). So is required a reliable technique to limit number of user at network which can lessen Congestion and call dropping. Call admission control ( CAC) be part of radio resource management ( RRM) which is an algorithm location at radio access network ( RAN). Principle of CAC that is receiving or not a call based on a certain parameter.At this end duty will study influence Call Admission Control ( CAC) to capacities and quality of service such as quality of signal, level interference, power change, probability blocking and delay admition and delay rejection at system WCDMA.Result of this research indicates that an algorithm admission control applicable to guarantee that an access radio system operates on a value (threshold), where an radio interface air is applied fully ( maximum) and quality of service ( QoS) to user which there at system before all and also new user ( call for admissions) has just remain to well guaranted. For Eb/N0 = 5 decibel average of active user of which can be handled 92 user 1 its(the cell, for Eb/N0 = 6 decibel can handle 72 user 1 its(the cell, Eb/N0 = 5 decibel can handle 58 user 1 its(the cell, and Eb/N0 = 2 decibel ( call for handoff) can handle 183 user 1 its(the cell. Probability blocking for this R-CAC algorithm system is 213 % = 0,0213 and its(the dropping probability 108 % = 0,0108.Keyword:

A New CAC Policy Based on Traffic Characterization in Cellular Networks

The Call Admission Control (CAC) method presented in this paper is based on the statistical properties of the network’s traffic variables. It probabilistically estimates the time until the release of a seized channel: the admission control depends on the computed mean remaining time averaged along all channels at a specific instant and on a time threshold. The policy produces a smooth transition between the QoS metrics, giving the operator the freedom to design the network at the desired QoS point. Another valuable property is that the algorithm is straightforward and fed only by simple teletraffic metrics: distribution and the first and second moments of Channel Holding Time (CHT). Simplicity is important for a CAC method because decisions for accepting or rejecting calls must be computed quickly and frequently.Peer Reviewe