A MAC Protocol for Multimedia Traffic in Slotted CDMA Wireless Communication Systems (original) (raw)
Related papers
A new MAC protocol ensuring the multimedia traffic QoS for CDMA networks
Wireless Personal Communications, 2003
This paper describes the CDMAC, a new Medium Access Control (MAC) protocol for multimedia traffic in CDMA wireless networks. The protocol intends to extract the maximum capacity and flexibility out of the CDMA scheme and at the same time guarantee the expected QoS of different service types. CDMAC is able to maintain QoS requirements thanks to the shaping, policing and traffic differentiation performed by the scheduler. Moreover, an iterative algorithm, applied at the beginning of each frame, is used to find the optimal power vector for all mobiles present in the system, which maximize the system capacity. The basic constraint of the capacity maximization process is that the BER QoS of each connection should be fulfilled. Finally a distributed implementation, feasible in a practical scenario, is presented.
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.
Resource Allocation in Multimedia CDMA Communication Systems
The future wireless communication systems are expected to support a broad range of multimedia services to mobile users with guaranteed quality-of-service (QoS). With the increasing demands for wireless services, the available frequency bandwidth of the systems is very limited and should be used efficiently. In this paper, we consider a wireless code-division multiple access (CDMA) system and develop an algorithm to allocate system resources to multimedia users for QoS provisioning and for high resource utilization. We propose a medium access control (MAC) protocol which exploits both time-division and code-division multiplexing. The MAC protocol uses fair packet loss sharing (FPLS) scheduling to guarantee the QoS requirements. The FPLS scheduler uses the information of traffic rate distribution and QoS requirements of the users to assign priorities to the users and determines an efficient accommodation of the packets in the time slots of each frame, so that the number of the served ...
IEEE Transactions on Wireless Communications, 2000
Today one of the challenges for wireless network operators is to find techniques which will make it possible to introduce multimedia capabilities into mobile communications. The application of a wireless network structure made up of pico-cells to solve this problem will cause an increase in the handover rate. Therefore, a major requirement in a wireless environment is to design an effective call admission control (CAC) strategy to minimize the handover drop probability. Another important requirement is to maximize network utilization, in terms of the mean number of channels used. The target of the paper is to define a resource management strategy for heterogeneous adaptive-rate traffic. The proposed strategy is actually a combination of two: a CAC management strategy and a bandwidth management one. The CAC management strategy extends the Guard Channel strategy to obtain priority-based CAC management for adaptive-rate sources; the bandwidth management strategy allows channels to be assigned proportionally to the throughput window declared by users. In order to assess the effectiveness of the proposed CAC strategy, two Markov models of the system are introduced: one, from the network point of view, to evaluate global system performance, and another, from the user point of view, to evaluate the performance each user is provided with by the network. Numerical examples conclude the paper to analyze which factors most affect performance when the source rate is adaptive and the proposed admission strategy is applied.
JES. Journal of Engineering Sciences, 2006
In this paper, we explore, via an extensive simulation study the design and performance evaluation of P-PRMA protocol that multiplexes voice traffic at the talkspurt level to efficiently integrate voice, rt-VBR video and data traffics in third generation picocellular wireless networks. We show the effect of preemption over PRMA by comparing two versions of the protocol one with preemption and the other without preemption. We focus on both MPEG-4 and H.263 coded movies with different encoding qualities. The design objectives include maximizing the system capacity (by finding the optimum permission probabilities of sending contending voice, data, and video) and to provide some guaranteed quality of service (QoS) to each user based on the traffic type. Two particular elements of QoS are considered here, which are the packet dropping probability, and the maximum transmission delay suffered by each packet. Results obtained show that the performance of P-PRMA is superior when compared to the normal PRMA, especially in case of MPEG-4 and HQ H.263 video streams.
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
Medium access control protocols for multimedia traffic in wireless networks
IEEE Network, 1999
This paper presents a survey on Medium Access Control (MAC) protocols for multimedia tra c in wireless networks. A basic overview of MAC protocol concepts is presented and a framework is developed on which to base qualitative comparisons. The MAC protocols covered in this paper include third generation TDMA and CDMA schemes intended for use in a single hop wireless system. The operation of each protocol is explained and its advantages and disadvantages are presented. Finally, a qualitative comparative outline of the discussed protocols is provided, based on multimedia tra c requirements.
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.
Proceedings of ICC/SUPERCOMM '96 - International Conference on Communications, 1996
A hybrid (reservation/random) medium access control protocol based on Code Division Multiple Access is described and analyzed under multimedia traffic load. The protocol meets the quality of service requirements of the different users and applications by following proper reservation policies and through a multi-priority mechanism which is imbeded in its collision resolution algorithm. The priority mechanism is implemented and controlled explicitly by the users and without any involvement from the network. This makes the allocation of priority transparent to the network infrastructure and adds tci the simplicity and practical value of the proposed scheme. T h e evaluation shows that the protocol is able to achieve high levels of utilization and is capable of supporting relatively large number of video/voice users and relatively high volumes of data traffic.