Performance of the joint CDMA/PRMA protocol for voice transmission in a cellular environment

Brand, Alex; Aghvami, A.H.

doi:10.1109/icc.1996.541257

Cited by 13 publications

(5 citation statements)

References 8 publications

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“…Since the CDMA system is interference limited, each capacity component corresponds to an interference component in the interference level. The total interference received at a given base station is given by (15) where is the interference from voice traffic and the interference from data traffic. The capacity region can be obtained from and the constraint factor .…”

Section: B Capacity Regionmentioning

confidence: 99%

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Hybrid channel assignment scheme for accommodating voice/data traffic in DS-CDMA cellular systems

Kim¹,

Kim

et al. 2000

IEEE Trans. Veh. Technol.

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A hybrid channel assignment (HCA) scheme in direct sequence-code division multiple access (DS-CDMA) systems for accommodating integrated voice/data traffic is proposed and the required power levels of voice and data traffic are derived. These levels can be used to maintain the minimum required link qualities of all calls. In the proposed scheme, delay-sensitive voice traffic is accommodated in circuit mode and delay-nonsensitive data traffic is accommodated in packet mode. The capacity region is derived and it can be used for controlling voice call admission and scheduling data packets. The proposed scheme can achieve a high link efficiency with reduced control overhead by statistically multiplexing voice and data traffic. Index Terms-Channel assignment, code division multiple access (CDMA), voice/data traffic. I. INTRODUCTION F UTURE wireless cellular systems will be required to accommodate various service applications, such as voice, interactive data, file transfer, internet access, images, and facsimiles. The growing user population of wireless applications demands new high-capacity, integrated multiple access schemes. Available radio resources are limited and radio channels experience frequency dependent fadings and delay spreads due to multipath time-varying propagation conditions. For frequency reuse efficiency and reliable communications in a harsh radio propagation environment, direct sequence-code division multiple access (DS-CDMA) shows promise for integrated multiple access schemes. Furthermore, wireless cellular systems are required to efficiently assign available radio channels to maximize spectrum utilization and to minimize radio link delay. In particular, integrated channel assignment schemes which guarantee flexible quality of service (QoS) control and high spectrum utilization are needed to accommodate various services. Radio channel assignment can be categorized into three classes according to control complexities of the central station:

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Section: B Capacity Regionmentioning

confidence: 99%

“…It requires a request channel to use statistical multiplexing of voice and data traffic. It includes D-TDMA [12], PRMA [13]- [15], RAMA [16], ERAMA [17], [18] and DQRUMA [19]. These methods were proposed to accommodate integrated voice/data services.…”

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confidence: 99%

Hybrid channel assignment scheme for accommodating voice/data traffic in DS-CDMA cellular systems

Kim¹,

Kim

et al. 2000

IEEE Trans. Veh. Technol.

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“…For a measure of QoS in the DS-CDMA system accommodating only voice calls, we define the bit energy-to-interference power spectral density ratio as (1) where denotes the total number of mobile terminals transmitting simultaneously, the information bit rate, the chip rate of the spreading sequence, the processing gain, the received power of a call, the information bit energy, and the two-sided power spectral density of additive white Gaussian noise (AWGN). The definition of (1) is motivated by the fact that the bit error rate is approximately given by BER Q where Q , when coherent detection and asynchronous transmission among multiple user terminals are used in AWGN channels [19]- [21]. In (1), we assume a rectangular chip pulse, from which the coefficient results: see [22, eq.…”

Section: A System Descriptionmentioning

confidence: 99%

Capacities of single-code and multicode DS-CDMA systems accommodating multiclass services

Lee

Lee²,

Sung³

1999

IEEE Trans. Veh. Technol.

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This paper is concerned with capacities of directsequence (DS) code-division multiple-access (CDMA) systems accommodating multiclass services with different transmission rates and bit error rates (BER's). The capacities are expressed by inequalities to which the number of accepted calls of each class should conform. Those inequalities are necessary and sufficient conditions satisfying the requirement of the bit energy-tointerference power spectral density ratio. The optimal received power is derived to cause the least interference to other signals while maintaining the acceptable bit energy-to-interference power spectral density ratio. It is shown that if the maximally receivable power of a call of each class is identical in the multicode system and the single-code system using a variable processing gain, the capacities of both systems are also identical in nonfading channels. However, in multipath fading channels, the multicode system is shown to be better than the single-code system in terms of capacity. Capacity is also derived in a dynamic multiple-cell environment. Index Terms-Capacity, DS-CDMA, multicode system, optimal received power, variable processing gain. I. INTRODUCTION F UTURE wireless systems such as FPLMTS/IMT-2000 [1], [2] and UMTS [3] are required to support multirate services (voice, video, data, etc.) with different quality of services (QoS's) [bit error rate (BER), delay, etc.]. Code division multiple access (CDMA) is a promising technique to comply with the above requirements [4]-[6]. It has many attractive features such as high-spectrum efficiency, soft handover, soft capacity, and low-frequency reuse factor [7], [8]. Two approaches have been proposed for supporting multirate services in direct-sequence (DS)-CDMA systems [4], [9]. One is a single-code transmission scheme using a variable processing gain which is defined as the ratio of chip rate to user information bit rate [10]. With the single-code transmission scheme, each user terminal transmits its signal on only one CDMA channel with a processing gain that varies inversely proportional to the user information bit rate. The other is a multicode transmission scheme [11]-[14]. With the multicode transmission scheme, a high-rate data stream is first split into several fixed low-rate streams. The multiple data streams are spread by different short codes with the same chip rate and are added together. Multiple short codes for one high-rate call should be orthogonal over an information bit interval to Manuscript

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“…Through mathematical and experimental verifbations, many papers (e.g. Brand and Aghvano [2], Nanda et al [13], and Wu and Ma [21]) suggest that the hybrid reservation/contention scheme provides a better performance than either single mode because it incorporates both flexibility and regularity; and consequently this hybrid scheme has been integrated into modern TDMA/CDMA protocols.…”

Section: Introductionmentioning

confidence: 99%

Per Connection Performance Analysis of a Frame-Based TDMA/CDMA MAC Protocol Containing both Reservation and Contention Slots

Chen

Chang

2005

Queueing Syst

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A mixture of reservation plus contention data slots is now widely implemented in TDMA/ CDMA systems to make a system flexible enough to suit various kinds of packets but preserve the good nature of frame-based protocols. We conducted performance analysis for an arbitrary connection in such a system under the assumption of MMPP (Markov-modulated Poisson process) arrivals. Accessible slot locations of this connection in a frame are made general. Success probability in accessing a contention slot is also made general. We have obtained the system size distribution which can be used to evaluate the performance of various frame-based MAC protocols. The MMPP arrival pattern can be generalized to the BMAP (batch Markovian arrival process) family to further accommodate a broader set of traffic sources.

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Performance of the joint CDMA/PRMA protocol for voice transmission in a cellular environment

Cited by 13 publications

References 8 publications

Hybrid channel assignment scheme for accommodating voice/data traffic in DS-CDMA cellular systems

Hybrid channel assignment scheme for accommodating voice/data traffic in DS-CDMA cellular systems

Capacities of single-code and multicode DS-CDMA systems accommodating multiclass services

Per Connection Performance Analysis of a Frame-Based TDMA/CDMA MAC Protocol Containing both Reservation and Contention Slots

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