A new MAC protocol for broadband wireless communications and its performance evaluation (original) (raw)
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A new MAC protocol design based on TDMA/FDD for QoS support in WATM networks
Computer Standards & Interfaces, 2006
Several wireless networking solutions have been developed to provide different types of services for various end user applications. Currently, wireless networking infrastructures are not suitable for multimedia applications each requiring a different QoS support with various traffic parameters. Due to the success of ATM technology in the wired network, WATM concept and related researches are of importance in the information technology area. Main objective of WATM, which promises seamless transmission of different traffics such as voice, data and video over wireless medium, is to implement high bit rate and QoS guaranteed data transfer, already well achieved by ATM technology over wired medium. To support QoS guaranteed data transfer over error-prone and low bandwidth wireless medium, an effective MAC protocol must be designed and utilized. In this paper, a new TDMA/FDD based MAC protocol, maintaining QoS requirements of real-time wireless multimedia applications, is proposed. The main contribution of this study is the new guarantee-based scheduling algorithm used in the proposed MAC to support required level of QoS guarantee for all multimedia traffic types in wireless medium. Computer modeling and simulation of the new approach providing CBR, VBR, ABR and UBR ATM services are realized using OPNET Modeler. Simulation results are also presented together with comparisons those of a WATM counterpart which uses PRMA/DA MAC protocol. D
2003
Wireless Local Area Networks (WLANs) is one of the most promising access technologies for the upcoming fourth-generation wireless communication systems. In the last few years, several research efforts have been devoted to investigate possible multiple access schemes capable of supporting real-time traffic as well as best-effort data transmissions. In particular, the use of suitable transmission schemes allows not only to achieve higher data-rates, but also to perform resource allocation in order to guarantee specific service requirements. In this paper we propose a medium access control (MAC) scheme for a WLAN supporting realtime (voice) and best-effort (data) services, based on Orthogonal Frequency Division Multiplexing (OFDM) technique. A suitable analytical approach is proposed in order to derive the performance of the proposed MAC scheme. In particular, it is shown in the paper that a high overall network capacity in terms of simultaneously active users is achieved by effectively exploiting the multiuser capabilities offered by OFDM, together with a proper service differentiation.
Performance Analysis of Multiple Access Protocol
1986
Wireless Local Area Networks (WLANs) is one of the most promising access technologies for the upcoming fourth-generation wireless communication systems. In the last few years, several research efforts have been devoted to investigate possible multiple access schemes capable of supporting real-time traffic as well as best-effort data transmissions. In particular, the use of suitable transmission schemes allows not only to achieve higher data-rates, but also to perform resource allocation in order to guarantee specific service requirements. In this paper we propose a medium access control (MAC) scheme for a WLAN supporting realtime (voice) and best-effort (data) services, based on Orthogonal Frequency Division Multiplexing (OFDM) technique. A suitable analytical approach is proposed in order to derive the performance of the proposed MAC scheme. In particular, it is shown in the paper that a high overall network capacity in terms of simultaneously active users is achieved by effectively exploiting the multiuser capabilities offered by OFDM, together with a proper service differentiation.
Dynamic slot assignment protocol for QoS support on TDMA-based mobile networks
Computer Standards and Interfaces, 2012
An efficient bandwidth allocation scheme in wireless networks should not only guarantee successful data transmission without collisions but also enhance the channel spatial reuse to maximize the system throughput. The design of high-performance wireless Local Area Network (LAN) technologies making use of TDMA/FDD MAC (Time Division Multiple Access/Frequency Division Duplex -Medium Access Control) is a very active area of research and development. Several protocols have been proposed in the literature as TDMA-based bandwidth allocation schemes. However, they do not have a convenient generic parameters or suitable frame repartition for dynamic adjustment. In this work, we undertake the design and performance evaluation of a QoS (Quality of Service)-aware scheme built on top of the underlying signaling and bandwidth allocation mechanisms provided by most wireless LANs standards. The main contribution of this study is the new guarantee-based dynamic adjustment algorithm used in MAC level to provide the required QoS for all traffic types in wireless medium especially Wireless ATM (Asynchronous Transfer Mode). Performance evaluation of this approach consists of improving the bandwidth utilization, supporting different QoS requirements and reducing call reject probability and packet latency.
High Performance Networking VII, 1997
Bandwidth reservation multiple access protocol (BRMA) resolves access contentions for mobile users in wireless local networks. Bandwidth is assigned to each user dynamically at frame level. In each frame, request channels are deterministically assigned to each user and are therefore contention-free. Data channels are assigned dynamically by base station and are therefore collisionfree. In this paper, BRMA is studied for multimedia traffic through simulations. Traffic patterns of different kinds, such as voice, data, real time high activity video (MPEG movie Star Wars) are used to study the protocol performance. With a proper admission control and with proper design of protocol parameters (service ratio, frame length, etc), traffic with different quality of service (QoS) requirements can be supported.
— The Quality of Service (QoS) provided for different types of multimedia applications such as audio, video, etc. The IEEE 802.16 standard defines different service classes with their associated (QoS) parameters. The MAC scheduling algorithm is the main role performing in QoS provisioning over such broadband wireless access (BWA) network and it is important that the scheduling algorithm have a multi-dimensional objective of satisfying QoS requirements of the users, maximizing system utilization and ensuring fairness among users. In this paper, we present comparative analysis for different types of MAC scheduling algorithms for the uplink (UL) connection. The proposed scheduling algorithms are compared to several other MAC scheduling algorithms for UL traffic under different mixes of traffic and for various characteristics of the IEEE 802.16 MAC layer such as throughput & delay. Simulation results indicate that MAC scheduling algorithms are not suitable for the multi-class traffic in IEEE 802.16 since they do not explicitly incorporate the QoS parameters for the given standard.
A MAC Protocol for Multimedia Traffic in Slotted CDMA Wireless Communication Systems
Wireless Personal Communications, 2005
In this paper, a media access control (MAC) protocol is proposed for multimedia traffic in slotted CDMA wireless communication systems. The channel resource is partitioned into four compartments: video, voice and data compartments, and common resource pool (CRP) which can be used by either voice or data. Video is only permitted to use its pre-allocated channels. Besides assigning voice to its own compartment, a threshold type decision policy is introduced to regulate voice call admission control in CRP. Data can use not only data and CRP compartments, but also the idle capacity of both video and voice. The proposed protocol provides a simple and flexible resource allocation decision for the multimedia traffic such that the bandwidth can be utilized efficiently while satisfying the quality of service (QoS) requirement for each traffic category. Two mathematical analysis methods are applied to evaluate the system performance. The first, Traditional Markov Analysis (TMA) is used to calculate the video and the voice blocking probabilities, and the second, Transient Fluid Analysis (TFA) is adopted to evaluate the average data delay and the channel utilization. Computer simulations verify the accuracy of mathematical models.
EURASIP Journal on Wireless Communications and Networking, 2006
A new medium access control (MAC) protocol is proposed for quality-of-service (QoS) support in wireless local area networks (WLAN). The protocol is an alternative to the recent enhancement 802.11e. A new priority policy provides the system with better performance by simulating time division multiple access (TDMA) functionality. Collisions are reduced and starvation of lowpriority classes is prevented by a distributed admission control algorithm. The model performance is found analytically extending previous work on this matter. The results show that a better organization of resources is achieved through this scheme. Throughput analysis is verified with OPNET simulations.
Adaptive Reservation TDMA Protocol for Wireless Multimedia Traffic
2001
Integration of CBR, voice, VBR, data and control traffic over the wireless ATM channel using the proposed AR-TDMA protocol is considered in the paper. The performance of the AR-TDMA in conjunction with the AFPBA-ASA protocol and FPBA-APCC protocol has been investigated and the simulation results are presented showing that the protocol satisfies the required QoS of each traffic category while providing a highly efficient utilisation of approximately 96% for the wireless ATM channel.
Throughput fairness analysis of reservation protocols of WiMedia MAC
2012
WiMedia standardized a fully distributed high data rate communication using ultra wideband (UWB) for wireless personal area networks (WPANs). WiMedia MAC provides asynchronous data communication service by Prioritized Channel Access (PCA) and isochronous service by Distributed Reservation Protocol (DRP). In this paper we propose three different approaches to analyze the reservation protocols, PCA and DRP, of WiMedia´s Medium Access Control (MAC). In the first two approaches we keep the portions of the superframe fixed for DRP and PCA traffics while the third approach follows random reservation. To test out the throughput fairness of PCA and DRP traffic by proposed approaches we present a scenario of connected nodes and incoming nodes with mixed traffic (video, VoIP and best effort). By means of simulations using Omnet++, we show that the system offers higher throughput by using approach 3, which provides access to medium by Hard, Soft and PCA reservation. The throughput fairness is also estimated for the three approaches by using Gini index.