Queueing analysis of CDMA slotted ALOHA systems with finite buffer and finite population assumptions

Okada, Hiraku; Yamazato, Takaya; Katayama, Masaaki; Ogawa, Akihiro

doi:10.1109/icc.1998.682883

Cited by 7 publications

(2 citation statements)

References 13 publications

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“…In this situation an approximate analytical approach is used. The queueing system which stores and serves data packets at the BS is analyzed by expanding a linear approximate model proposed in [16] and then used in [17]. It is assumed that the system state depends only on the aggregate number n d of data packets in the queueing system.…”

Section: System Performance At the Data Packet Levelmentioning

confidence: 99%

Approximate performance analysis of slotted downlink channel in a wireless CDMA system supporting integrated voice and data services

Świderski

2004

JTIT

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This paper is concerned with the performance analysis of a slotted downlink channel in a wireless CDMA communication system with integrated packet voice and data transmission. The system model consists of mobile terminals (MT) and a single base station (BS). It is assumed that the voice (data) packet error rate (PER) does not exceed 10-2 (10-5). With this requirement the number of simultaneous transmissions over the downlink channel is limited. Therefore, the objective of the call admission control is to restrict the maximum number of CDMA codes available to voice and data traffic. Packets of accepted voice calls are transmitted immediately while accepted data packets are initially buffered at the BS. This station distinguishes between silence and talkspurt periods of voice sources, so that data packets can use their own codes for transmission during silent time slots. Data packets are buffered in queues created separately for each destination. Discrete-time Markov processes are used to model the system operation. Statistical dependence between queues is the main difficulty which arises during the analysis. This dependence leads to serious computational complexity. The aim of this paper is to present an approximate analytical method based on the restricted occupancy urn model which enables to evaluate system performance despite the dependence. Numerical calculations compared with simulation results show excellent agreement for the average system throughput and the blocking probability of data packets for higher system loads. On the other hand, when the average data packet delay is considered, analytical results underestimate simulation and therefore only approximate system performance evaluation is possible.

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Section: System Performance At the Data Packet Levelmentioning

confidence: 99%

Approximate performance analysis of slotted downlink channel in a wireless CDMA system supporting integrated voice and data services

Świderski

2004

JTIT

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“…More specifically, the system state can be defined as the number of all data packets at the BS in a given time slot and the behavior of such a queueing system may be described by the Markov chain with states, where is the number of queues and denotes the maximum length of each queue. The analytical approach used in [12] (this approach is based on earlier results presented in [13] and then utilized in [14]) assumes speech activity detection but it is approximate since the exact packet distribution among the queues cannot be directly derived from the reduced state description. Namely, the problem of packet distribution calculation is solved by estimation and this estimation is obtained by considering a restricted occupancy urn model [13].…”

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confidence: 99%

Approximate performance analysis of heavily loaded slotted downlink channel in a wireless CDMA system supporting integrated voice/data services

Świderski

2005

IEEE Trans. Wireless Commun.

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This paper is concerned with the performance analysis of a slotted downlink channel in a wireless code division multiple access (CDMA) communication system with integrated packet voice/data transmission. The system model consists of a base station (BS) and mobile terminals (MT), each of which is able to receive voice and/or data packets. Packets of accepted voice calls are transmitted immediately while accepted multipacket data messages are initially buffered in first in, first out (FIFO) queues created separately for each destination. The BS distinguishes between silence and talkspurt periods of voice sources, so that packets of accepted data messages can use their own codes for transmission during silent time slots. To fulfill QoS requirements for both traffic types, the number of simultaneous packet transmissions over the downlink channel must be limited. To perform this task, a fair, single-priority multiqueueing scheduling scheme is employed. Discrete-time Markov processes are used to model the system operation. Statistical dependence between queues is the main difficulty which arises during the analysis. This dependence leads to serious computational complexity. The aim of this paper is to present an approximate analytical method which enables one to evaluate system performance despite the dependence. Therefore, it is assumed that the system is heavily loaded with data traffic, and a heuristic assumption is made that makes the queueing analysis computationally tractable. Typical system performance measures (i.e., the data message blocking probability, the average data throughput and delay) are evaluated, however, due to the accepted heuristic assumption, the analysis is approximate and that is why computer simulation is used to validate it.Index Terms-Code division multiple access (CDMA), personal communication systems, queueing analysis, voice and data integration. NOMENCLATUREProcessing gain of the CDMA system. Slot duration [ms]. Number of MTs accepting data number of queues at the BS. Number of CDMA codes used simultaneously (in the same time slot). Number of nonempty queues in time slot . Number of queues which can be served simultaneously in the same time slot . Voice/data packet length [bits].

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Performance and stability analysis of buffered slotted ALOHA protocols using tagged user approach

Wan

Sheikh

2000

IEEE Trans. Veh. Technol.

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Queueing analysis of CDMA slotted ALOHA systems with finite buffer and finite population assumptions

Cited by 7 publications

References 13 publications

Approximate performance analysis of slotted downlink channel in a wireless CDMA system supporting integrated voice and data services

Approximate performance analysis of slotted downlink channel in a wireless CDMA system supporting integrated voice and data services

Approximate performance analysis of heavily loaded slotted downlink channel in a wireless CDMA system supporting integrated voice/data services

Performance and stability analysis of buffered slotted ALOHA protocols using tagged user approach

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