Performance of a joint CDMA/PRMA protocol for mixed voice/data transmission for third generation mobile communication

Brand, Alex; Aghvami, A.H.

doi:10.1109/49.545692

Cited by 115 publications

(62 citation statements)

References 16 publications

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“…A nonorthogonal code with a length of 7 is a commonly used pseudorandom code [29]. For example, it has been used in many other studies to simulate CDMA systems (see [20], [21], [30]). To simulate the noise effect, we also assume a reasonable noise level equivalent to SINR ¼ 10 db.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

Cross-Layer Optimization for Multimedia Transport over Multicode CDMA Networks

Chen

Chan

Leung

2011

IEEE Trans. on Mobile Comput.

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Abstract-Most previous work on code division multiple access (CDMA) considers the bit error ratio (BER) at the physical layer and the frame drop ratio (FDR) at the medium access control layer separately. However, a better system performance, e.g., in terms of a lower overall frame loss ratio (FLR), can be achieved if BER and FDR are jointly optimized. In this paper, we propose a cross-layer optimization scheme called traffic-adaptive scheme for multicode CDMA operating over a time division multiple access (TDMA) channel. Based on the traffic condition and buffer status, this scheme employs a Markov Decision Process (MDP) to determine the optimal value of the maximum number of simultaneous data frames that can be transmitted in each time slot of a TDMA frame so as to minimize the overall FLR of the system. To facilitate implementation, we also propose an approximation scheme named the rateadaptive scheme to reduce the computation cost. Simulation and analytical results show that both the traffic-adaptive scheme and rate-adaptive scheme can significantly reduce FLR, increase the system throughput, and optimize the packet access delay of the system. Furthermore, the rate-adaptive scheme can achieve a performance close to the traffic-adaptive scheme when the traffic load in the system is high.

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Section: Numerical Results and Discussionmentioning

confidence: 99%

Cross-Layer Optimization for Multimedia Transport over Multicode CDMA Networks

Chen

Chan

Leung

2011

IEEE Trans. on Mobile Comput.

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“…If comparisons try to include the physical layer as well as link layer elements, the model becomes easily untreatable and many mix-up and compensation effects may not allow reaching all conclusions in a very clear way. Therefore, many of the studies concerning the MAC layer simplify the physical layer model or even it is not included at all [8], [28], [29], while those research works covering, for example, power control, sectorization, voice activity monitoring, effects of shadowing and multipath propagation, etc., usually do not introduce any specific MAC protocol, traffic statistics, etc., [30], [31]. The reason is the untreatable models that could come up.…”

Section: Prma++ and Adaptive S-aloha Ds-cdma Comparisonmentioning

confidence: 99%

Adaptive S-ALOHA CDMA as an alternative way of integrating services in mobile environments

Sallent

Agustí

2000

IEEE Trans. Veh. Technol.

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Abstract-Code-division multiple-access (CDMA) schemes appear to be very promising access techniques for coping with the requirements of third-generation mobile systems, mainly because of their flexibility. This paper proposes an adaptive S-ALOHA DS-CDMA access scheme as a method for integrating nonreal-time (i.e., Internet applications) and real-time (i.e., voice) services in a multicell scenario by exploiting the potentials of CDMA under time-varying channel load conditions. The adaptive component makes data terminals autonomously change their transmission rate according to the total (voice+data) channel occupancy, so that the minimum possible data delay, which can be analytically obtained by defining a birth-death process, is almost always achieved. Moreover, by means of a simplified cellular model, the proposed algorithm revealed the same behavior, i.e., it tries to select the most suitable transmission rate at any time slot, when it is affected by intercell interference and even by power control imperfections. Finally, in order to gain more insight into the potentials of such an access strategy, the adaptive S-ALOHA CDMA scheme is then compared to a reservation time-division multiple-access (TDMA)-based protocol (PRMA++), showing the benefits of the CDMA-based solution in terms of capacity, flexibility, and data delay performance.

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“…Now, it is a well-established fact that a backoff procedure is required to achieve protocol stability when using distributed scheduling control (and the proposed protocols are no exception) by introducing controlled random delays. In [8], the backoff procedure is also used to differentiate between services with different delay requirements. In this way, a major problem when using distributed scheduling control, which is the QoS support for services with delay constraints in the absence of a centralized scheduler, is addressed in [8].…”

Section: Introductionmentioning

confidence: 99%

Low-complexity medium access control protocols for QoS support in third-generation radio access networks

O’Farrell

Omiyi

2005

IEEE Trans. Wireless Commun.

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Article:O'Farrell, T. and Omiyi, P. (2005) Abstract-One approach to maximizing the efficiency of medium access control (MAC) on the uplink in a future wideband code-division multiple-access (WCDMA)-based third-generation radio access network, and hence maximize spectral efficiency, is to employ a low-complexity distributed scheduling control approach. The maximization of spectral efficiency in third-generation radio access networks is complicated by the need to provide bandwidth-on-demand to diverse services characterized by diverse quality of service (QoS) requirements in an interference limited environment. However, the ability to exploit the full potential of resource allocation algorithms in third-generation radio access networks has been limited by the absence of a metric that captures the two-dimensional radio resource requirement, in terms of power and bandwidth, in the third-generation radio access network environment, where different users may have different signal-to-interference ratio requirements. This paper presents a novel resource metric as a solution to this fundamental problem. Also, a novel deadline-driven backoff procedure has been presented as the backoff scheme of the proposed distributed scheduling MAC protocols to enable the efficient support of services with QoS imposed delay constraints without the need for centralized scheduling. The main conclusion is that low-complexity distributed scheduling control strategies using overload avoidance/overload detection can be designed using the proposed resource metric to give near optimal performance and thus maintain a high spectral efficiency in third-generation radio access networks and that importantly overload detection is superior to overload avoidance.Index Terms-Medium access control (MAC), quality of service (QoS), radio resource management, third-generation mobile systems, WCDMA.

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Performance of a joint CDMA/PRMA protocol for mixed voice/data transmission for third generation mobile communication

Cited by 115 publications

References 16 publications

Cross-Layer Optimization for Multimedia Transport over Multicode CDMA Networks

Cross-Layer Optimization for Multimedia Transport over Multicode CDMA Networks

Adaptive S-ALOHA CDMA as an alternative way of integrating services in mobile environments

Low-complexity medium access control protocols for QoS support in third-generation radio access networks

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