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

• Autorzy: Świderski J.
• Języki publikacji: EN

Abstrakty

EN

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 lO(-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 E 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 talk-spurt 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.

Słowa kluczowe

EN

wireless CDMA system; synchronous downlink; voice and data integration; queueing analysis

• Wydawca: Instytut Łączności - Państwowy Instytut Badawczy
• Czasopismo: Journal of Telecommunications and Information Technology
• Rocznik: 2004
• Tom: nr 2
• Strony: 47--53
• Opis fizyczny: Bibliogr. 19 poz., tab., rys.

Twórcy

autor

Świderski J.

• Institute of Power Engineering, Div. Gdańsk, Mikołaja Reja st 27, 80-870 Gdańsk,

Bibliografia

• [1] M. B. Pursley, „The role of spread spectrum in packet radio networks", Proc. IEEE, vol. 75, no. 1, pp. 116-134, 1987.
• [2] A. J. Viterbi, CDMA: Principles of Spread Spectrum Communication. Reading, MA: Addison-Wesley, 1995.
• [3] R. Prasad and T. Ojanpera, „An overview of CDMA evolution toward wideband CDMA", IEEE Commun. Surv., vol. 1, no. 1, pp. 2-28, Fourth Quarter 1998.
• [4] N. D. Wilson, R. Ganesh, K. Joseph, and D. Raychaudhuri, „Packet CDMA versus dynamic TDMA for multiple access in an integrated voice/data PCN", IEEE J. Select. Areas Commun., vol. 11, no. 6, pp. 870-884, 1993.
• [5] T. Liu and J. A. Silvester, „Joint admission/congestion control for wireless CDMA systems supporting integrated services", IEEE J. Select. Areas Commun., vol. 16, no. 6, pp. 845-857, 1998.
• [6] W. Yue and Y. Matsumoto, „Output and delay process analysis for slotted CDMA wireless communication networks with integrated voice/data transmission", IEEE J. Select. Areas Commun., vol. 18, no. 7, pp. 1245-1253, 2000.
• [7] J. M. Capone and L. F. Merakos, „Integrating data traffic into CDMA cellular voice system", Wirel. Netw., vol. 1, pp. 389-401, 1995.
• [8] R. Fantacci and L. Zoppi, „A CDMA wireless packet network for voice/data transmissions", IEEE Trans. Commun., vol. 45, no. 10, pp. 1162-1166, 1997.
• [9] M. Soroushnejad and E. Geraniotis, „Multi-access strategies for an integrated voice/data CDMA packet radio network", IEEE Trans. Commun., vol. 43, no. 2/3/4, pp. 934-945, 1995.
• [10] E. Geraniotis, M. Soroushnejad, and W.-B. Yang, „A multi-access scheme for voice/data integration in hybrid satellite/terrestrial packet radio networks"", IEEE Trans. Commun., vol. 43, no. 2/3/4, pp. 1756-1767, 1995.
• [11] Y. Yang and E. Geraniotis, „Admission policies for integrated voice and data tra_c in CDMA packet radio networs", IEEE J. Select. Areas Commun., vol. 12, no. 4, pp. 654-664, 1994.
• [12] J. Świderski, „Approximate performance analysis of heavily loaded slotted downlink channel in a wireless CDMA system supporting integrated voice/data services", accepted for publication in IEEE Trans. Wirel. Commun.
• [13] R. K. Morrow Jr. and J. S. Lehnert, „Bit-to-bit error dependence in slotted DS/SSMA packet systems with random signature sequences", IEEE Trans. Commun., vol. 37, no. 10, pp. 1052-1061, 1989.
• [14] A. Polydoros, A. Anastasopoulos, T.-B. Liu, P. Panagiotou, and C.-M. Sun, „An integrated physical/link-access layer model of packet radio architecture", California PATH Res. Rep. UCB-ITS-PRR-94-20, Oct. 1994.
• [15] L. B. Milstein, T. S. Rappaport, and R. Barghouti, „Performance evaluation for cellular CDMA", IEEE J. Select. Areas Commun., vol. 10, no. 4, pp. 680-689, 1992.
• [16] A. Ganz and T. Chlamtac, „A linear solution to queueing analysis of synchronous _nite bu_er networks", IEEE Trans. Commun., vol. 38, no. 4, pp. 440-446, 1990.
• [17] H. Okada, T. Yamazato, M. Katayama, and A. Ogawa, „Queueing analysis of CDMA slotted ALOHA system with finite buffer and finite population assumptions", in Proc. IEEE Int. Conf. Commun., Atlanta, USA, 1998, pp. 407-411.
• [18] L. Kleinrock, Queueing Systems. Vol. 1, Theory. New York: Wiley, 1975.
• [19] Computer Performance Modeling Handbook, S. S. Lavenberg, Ed. New York: Academic Press, 1983.