Multichannel ALOHA data networks for personal communications services (PCS)

Zhang, Z.; Liu, Y.-J.

doi:10.1109/glocom.1992.276527

Cited by 15 publications

(4 citation statements)

References 5 publications

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“…However, when p s is larger, such as 0.7 < p s < 1, the difference between the two polices is diminished. Note that when p s = 1, i.e., no retransmission is needed, the access delays for the two policies are the same, as also being observed from the equations (7) and (10).…”

Section: B Access Delay In Ofdma Systemsupporting

confidence: 55%

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An efficient random access scheme for OFDMA systems with implicit message transmission

Ping

Wang

et al. 2008

IEEE Trans. Wireless Commun.

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Random access channel (RACH) is usually used for initial channel access, bandwidth request, etc. In this paper, we analyze the throughput and access delay performance of the RACH in an orthogonal frequency division multiple access (OFDMA) system. A closed-form expression of the RACH throughput is presented and its mean access delays under both binary exponential and uniform backoff policies have also been derived. Moreover, to further improve the utilization of RACH in an OFDMA system, we propose a novel message transmission scheme in a shared RACH. The message in the proposed scheme can be sent implicitly in the cyclic-shifted preambles which make the transmission much more reliable in a contention based RACH. Meanwhile, performance of the preamble detection has also been improved by the redundant information conveyed in messages. Finally, simulation results will demonstrate performance gains of the proposed scheme.

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Section: B Access Delay In Ofdma Systemsupporting

confidence: 55%

“…Various contributions have comprehensively studied the throughput of the RACH based on single-channel or multi-channel slotted ALOHA [8]- [10]. However, so far no closed-from expressions of the RACH throughput for the OFDMA systems have been derived in the literature.…”

Section: Introductionmentioning

confidence: 98%

An efficient random access scheme for OFDMA systems with implicit message transmission

Ping

Wang

et al. 2008

IEEE Trans. Wireless Commun.

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“…In [5], a new expression is derived for the throughput of multichannel slotted ALOHA with capture in Rayleigh fading environment. In [6], reservation is considered. But all of them were not considered QoS of traffic accessed channels.…”

Section: Introductionmentioning

confidence: 99%

“…While much research has been devoted to the slotted ALOHA in single-channel environments, our work focuses on the multichannel slotted ALOHA like in [4]- [6]. In [4], the multichannel slotted ALOHA is analyzed for fixed bandwidth per channel or fixed total bandwidth, which is designed for multichannel satellite communication.…”

Section: Introductionmentioning

confidence: 99%

QoS-Aware Multichannel Random Access in CDMA2000 Nx EV-DO Systems

Zhang

2007

2007 IEEE 65th Vehicular Technology Conference - VTC2007-Spring

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CDMA2000 Nx EV-DO, also known as DO-REV. B, is a third generation (3G) wireless solution providing high-speed mobile Internet access. In this paper we describe the design of the access channel MAC protocol considering the QoS of traffic. A QoS-aware multichannel random access based on slotted ALOHA scheme was proposed. Through the theoretical model and simulation results, we confirm that the proposed algorithm has the advantage of giving high throughput to high priority service.

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