1,103 research outputs found
EVEREST IST - 2002 - 00185 : D23 : final report
Deliverable pĂșblic del projecte europeu EVERESTThis deliverable constitutes the final report of the project IST-2002-001858 EVEREST. After its successful completion, the project presents this document that firstly summarizes the context, goal and the approach objective of the project. Then it presents a concise summary of the major goals and results, as well as highlights the most valuable lessons derived form the project work. A list of deliverables and publications is included in the annex.Postprint (published version
Recommended from our members
Call admission control using cell breathing concept for wideband CDMA
This paper presents a Call Admission Control
(CAC) algorithm based fuzzy logic to maintain the quality of
service using cell breathing concept. When a new call is accepted
by a cell, its current user is generally affected due to cell
breathing. The proposed CAC algorithm accepts a new call only
if the current users in the cell are not jeopardized. Performance
evaluation is done for single-cell and multicell scenarios. In
multicell scenario dynamic assignment of users to the
neighboring cell, so called handoff, has been considered to
achieve a lower blocking probability. Handoff and new call
requests are assumed with handoff being given preference using
a reserved channel scheme. CAC for different types of services
are shown which depend upon the bandwidth requirement for
voice, data and video. Distance, arrival rate, bandwidth and nonorthogonality
factor of the signal are considered for making the
call acceptance decision. The paper demonstrates that fuzzy logic
with the cell breathing concept can be used to develop a CAC
algorithm to achieve a better performance evaluation
An Erlang multirate loss model supporting elastic traffic under the threshold policy
In this paper, we propose a multirate teletraffic loss model of a single link with certain bandwidth capacity that accommodates Poisson arriving calls, which can tolerate bandwidth compression (elastic traffic), under the threshold policy. When compression occurs, the service time of new and in-service calls increases. The threshold policy provides different QoS among service-classes by limiting the number of calls of a service-class up to a pre-defined threshold, which can be different for each service-class. Due to the bandwidth compression mechanism, the steady state probabilities in the proposed model do not have a product form solution. However, we approximate the model by a reversible Markov chain, and prove recursive formulas for the calculation of call blocking probabilities and link utilization. The accuracy of the proposed formulas is verified through simulation and found to be very satisfactory
A resource management architecture for future mobile communications systems
This paper presents an overview of a hierarchical Resource Management architecture for future mobile communications systems. The architecture is designed to be generic and can therefore be adopted for a range of Radio Access Methodologies. In particular it provides a mechanism for radio resource management across airinterfaces such as those being defined for use with UMTS. Given the move towards packet-switched technologies both in the Core Network and the Radio Access Network [1], the architecture embraces the concept of statistical QoS applied to individual flows in the form of a commitment level. I
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
Final report on the evaluation of RRM/CRRM algorithms
Deliverable public del projecte EVERESTThis deliverable provides a definition and a complete evaluation of the RRM/CRRM algorithms selected in D11 and D15, and evolved and refined on an iterative process. The evaluation will be carried out by means of simulations using the simulators provided at D07, and D14.Preprin
An optimum dynamic priority-based call admission control scheme for universal mobile telecommunications system
The dynamism associated with quality of service (QoS) requirement for traffic emanating from smarter end users devices founded on the internet of things (IoTs) drive, places a huge demand on modern telecommunication infrastructure. Most telecom networks, currently utilize robust call admission control (CAC) policies to ameliorate this challenge. However, the need for smarter CAC has becomes imperative owing to the sensitivity of traffic currently being supported. In this work, we developed a prioritized CAC algorithm for third Generation (3G) wireless cellular network. Based on the dynamic priority CAC (DP-CAC) model, we proposed an optimal dynamic priority CAC (ODP-CAC) scheme for Universal Mobile Telecommunication System (UMTS). We then carried out simulation under heavy traffic load while also exploiting renegotiation among different call traffic classes. Also, we introduced queuing techniques to enhance the new calls success probability while still maintaining a good handoff failure across the network. Results show that ODP-CAC provides an improved performance with regards to the probability of call drop for new calls, network load utilization and grade of service with average percentage value of 15.7%, 5.4% and 0.35% respectively
- âŠ