Multi-Scenario Based Call Admission Control for Coexisting Heterogeneous Wireless Technologies (original) (raw)
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Call Admission Control algorithm for Wireless Multimedia Networks
Wireless multimedia networks are becoming increasingly popular as they provide users the convenience of access to information and services anytime, anywhere and in any format. The upcoming wireless cellular infrastructures such as third generation (3G) and fourth generation (4G) are deemed to support new high-speed services with different Quality-of-Service (QOS) and their respective traffic profiles. Different wireless multimedia services have diverse bandwidth and QOS requirements, which need to be guaranteed by the wireless cellular networks. The call admission control algorithm deals with multiple classes of calls having different requirements, requesting different Quality of Service (QOS) and with different priorities for admission into the network. In this paper we present a Adaptive Call admission Control algorithm for the next generation of wireless cellular networks at the connection level, where the bandwidth allocated to the ongoing calls can be dynamically adjusted by Bandwidth up gradation and degradation algorithms. This framework supports establishing a priority mechanism for handoff calls over new calls and also establishing a priority mechanism for different types of traffic classes (CBR, VBR, UBR). The performance of proposed adaptive CAC algorithm is evaluated based on the New Call Blocking Probability, Hand off Call Dropping rate with the existing CAC algorithm for wireless multimedia networks. By simulation results it is shown that our proposed algorithm achieves less New Call Blocking Probability, Hand off Call Dropping rate for different traffic classes.
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Abstract: The heterogeneous nature of the next generation wireless systems (NGWS) poses many challenges to the call admission control algorithm. In this paper, a hierarchical approach to joint call admission control is proposed for the heterogeneous wireless networks. In the proposed scheme, the joint call admission control algorithm will be divided into two; namely, horizontal call admission control (HCAC) and vertical call admission control (VCAC). This approach will avoid unnecessary signalling and processing for certain stages of the joint call admission control that are specific to an access network technology. We modify the dual threshold bandwidth reservation scheme (DTBR) to triple threshold bandwidth reservation scheme (TTBR) to support vertical handoff calls. The strong feature of this scheme is that it is based on complete sharing (CS) of the overall bandwidth, which is believed to yield high radio resource utilization while meeting guaranteed quality of service (QoS). Ke...
A New Call Admission and Bandwidth Reservation Scheme for Future Wireless Networks
The paper proposes a new scheme for call admission and bandwidth reservation for the next generation wireless networks. The proposed scheme OPBR (optimal cell partition based bandwidth reservation) does an optimal partitioning of the cell to give high degree of call admission and successful handoff. In addition it offers effective bandwidth utilization and guarantee QoS. The performance of the scheme is done by analytical modeling and simulation experiments. A comparison with two different schemes (PBR and adaptive reservation) shows desirable results can be achieved by proposed scheme with better performance for various QoS parameters.
Call admission control for voice and data traffic in wireless communications
Computer Communications, 2002
Call admission control (CAC) in multimedia wireless communications is to guarantee quality of service (QoS) to mobile users and to achieve a high resource utilization ef®ciency. It is a challenging issue due to user mobility, limited radio spectrum, heterogeneous nature of multimedia traf®c. This paper proposes a CAC policy for a wireless system supporting both constant-rate voice calls and available-rate data calls. The parameters of the proposed policy is determined in a systematic way by using an optimization approach. Soft QoS (relaxed target QoS) is introduced to make a compromise between the QoS levels of the voice and data calls, respectively, in a heavy traf®c load situation. Numerical results show that the proposed CAC policy can guarantee the QoS of all the users under most traf®c conditions considered. q
Call admission control in wireless networks: A comprehensive survey
IEEE Communications Surveys and Tutorials, 2005
Radio resource management (RRM) plays a major role in Quality of Service (QoS) provisioning for wireless communication systems. The performance of RRM techniques has a direct impact on each user's individual performance and on the overall network performance. Arriving (new and handoff) calls are granted/denied access to the network by the call admission scheme (CAC) based on predefined criteria, taking the network loading conditions into consideration. CAC in wireless networks has been receiving a great deal of attention during the last two decades due to the growing popularity of wireless communications and the central role that CAC plays in QoS provisioning in terms of the signal quality, call blocking and dropping probabilities, packet delay and loss rate, and transmission rate. In the first and second generation of wireless systems, CAC has been developed for a single service environment. In the third generation and beyond wireless systems, multimedia services such as voice, video, data, and audio are to be offered with various QoS profiles. Hence, more sophisticated CAC schemes are developed to cope with these changes. This article provides a comprehensive survey of CAC schemes in modern wireless networks.
2006 Asia-Pacific Conference on Communications, 2006
pico or micro-sized cells will increase the handoff rate, and thus, leads to higher handoff dropping rate The allocation of scarce resources to support real-that makes QoS guarantees to the multimedia services time multimedia services with different Quality of difficult. Multimedia services impose stringent QoS Service (QoS) requirements is a fundamental problem demands on the wireless networks. in wireless cellular networks. In this paper, we In wireless cellular networks, user' s QoS propose a new Call Admission Control (CAC) and requirements can be quantitatively expressed in terms resource reservation scheme for cellular-based of probabilistic connection-level QoS parameters such multimedia wireless networks. The well-known CAC as Call Blocking Probability (CBP) and Call Dropping guard channel policy [3] is modified to be applicable Probability (CDP) [2]. Therefore, one of the most for different traffic classes with diverse QoS important connection-level QoS issues is how to requirements. The proposed scheme is modeled as reduce and control CDP due to the lack of available M/MI/CC queueing system and the performance bandwidth so that mobile users can continue their measures, call blocking probability and call dropping ongoing connections. Efficient Call Admission Control probability are computed. (CAC) and Bandwidth Reservation (BR) schemes are necessary to maintain the desired QoS. CAC schemes
Call Admission Control Jointly with Resource Reservation in Cellular Wireless Networks
EURASIP Journal on Wireless Communications and Networking, 2010
To efficiently utilize the total resources and to serve mobile users demanding for different types of service, system resource utilization of these services should be considered, and efficient resource management techniques should be developed. In this paper, we propose a new call admission control (CAC) scheme jointly with resource management by considering the two service types: prioritized calls and nonprioritized calls. Proposed scheme limits the new and handoff prioritized and non-prioritized call arrivals according to call-level quality of service (QoS) requirements. By searching algorithm, admission parameters are obtained optimally and required QoS are guaranteed. Due to high priority of the prioritized calls, the admittance of non-prioritized calls into channel is restricted, while prioritized calls are admitted as long as there is sufficient bandwidth. To evaluate the performance of the proposed CAC scheme, we have compared the numerical results from the analytical model with those of New Call Bounding scheme. It is shown that the proposed CAC scheme uses the resources effectively and improves all the upper-bound QoS requirements with respect to the New Call Bounding scheme for prioritized and non-prioritized users.
Call admission control for mobile multimedia wireless networks
2002
Abstract-Call Admission Control (CAC) policies in mobile cellular wireless networks give priority to handoff requests over new call requests. In the guard channel policy, an integer number of channels are reserved for handoff calls, while the fractional guard channel policy rejects new calls with a probability that varies with the current channel occupancy. The effect of reservations on new and handoff call blocking probabilities has previously been studied for a single service class only.
Adaptive Call Admission Control for Multimedia Wireless Networks with QoS Provisioning
This paper introduces a novel Quality of Service Adaptive Call Admission Control (QoS-AdCAC) framework for next generation broadband wireless cellular networks supporting wireless multimedia services with different classes of traffic and diverse bandwidth requirements. In this work, each base station locally, independently of other base stations in the network, differentiates between new and handoff calls for each class of traffic by assigning a threshold to each class according to its QoS requirements. The threshold values change dynamically in order to respond to the varying traffic conditions. The main feature of the proposed framework is its ability to simultaneously achieve several design goals, which makes it suitable for real time execution. Simulation results show the strength of our proposed framework.
Adaptive call admission control for QoS provisioning in multimedia wireless networks
Computer Communications, 2003
In this paper, we propose a new framework called adaptive quality of service (AdQoS) to guarantee the quality of service (QoS) of multimedia traffic generally classified as real-time and non-real-time. AdQos supports future generation wireless networks because it implements a traffic-based admission control, bandwidth reallocation and reservation schemes to support the different multimedia traffic. The objectives that AdQoS framework tries to accomplish are minimum new call blocking and handoff dropping rates. The key feature of this framework is the bandwidth reallocation scheme. This scheme is developed to control the bandwidth operation of ongoing connections when the system is overloaded. The performance of the system is evaluated through simulations of a realistic cellular environment. Simulation results show that our proposed scheme reduces the new call blocking probabilities, the handoff dropping probabilities and reduces significantly the probability of terminated calls while still maintaining efficient bandwidth utilization compared to conventional schemes proposed in the literature. q 2002 Published by Elsevier Science B.V.