Theoretical blocking probability for SDMA

Galván-Tejada, Giselle M.; Gardiner, J.G.

doi:10.1049/ip-com:19990688

Cited by 23 publications

(12 citation statements)

References 2 publications

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“…One important observation from SDMA studies is that the packet successful probability P ps for acquiring a SDMA resource depends on the state of the operational cellular systems, such as the traffic and SINR. The first-duplicated SDMA scheduling always works better than subsequent duplicated-last SDMA scheduling in terms of call blocking probability [9].…”

Section: First-duplicated a N D Duplicated-last Sdma Schedulingsmentioning

confidence: 99%

“…In TDD, the BS can first measure the channel characteristic between itself and an MS, then use this information as a basis for future communications using the smart antenna. The spatial resources are allocated by SDMA scheduling, which are mentioned in [8][9][10]. The spatial resource will be assigned according to a signal-to-interference-plus-noise-ratio (SINR) for each MS.…”

Section: S P a T I A L D Iv I S I O N M U L T I P L E Accessmentioning

confidence: 99%

See 1 more Smart Citation

Intelligent MBWIMA/UMTS Protocol Using SDMA Scheduling in UTRA TDD Mode

Mar

Kao

2006

Wireless Pers Commun

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The intelligent medium access control (MAC) protocol based on cascade fuzzy logic control (CFLC) using the first-duplicated space division multiple access (SDMA) scheduling for UTRA TDD mode is presented in this paper. Voice, data and video are integrated for transmission using CFLC-based movable boundary wireless multiple access in the UMTS (MBWIMA/UMTS) protocol. The CFLC-based MBWIMA/UMTS protocol performance with data rate control is optimized using the CFLC to generate the proper maximum number of voice/video slots and a suitable data rate. The first-duplicated SDMA scheduling, which provides the SDMA scheduling management, can increase the wireless mobile system capacity and reduce the voice-video dropping probability. The simulation results demonstrate that the CFLC-based MBWIMA/UMTS protocol using the first-duplicated SDMA scheduling can greatly improve both the voice-video dropping probability and data packet delay, compared with the MBWIMA/UMTS and GPRS/UMTS protocols using the first-duplicated SDMA scheduling at the expense of a small decrease in data packet throughput.

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Section: First-duplicated a N D Duplicated-last Sdma Schedulingsmentioning

confidence: 99%

Section: S P a T I A L D Iv I S I O N M U L T I P L E Accessmentioning

confidence: 99%

Intelligent MBWIMA/UMTS Protocol Using SDMA Scheduling in UTRA TDD Mode

Mar

Kao

2006

Wireless Pers Commun

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“…For two-fold SDMA wireless networks, there are many channel allocation methods in which up 2L sources are utilized [1,12] such as "first duplicate" (FD) and "duplicate at last" (DL). (Assume L physical channels are available for a conventional wireless network.)…”

Section: Channel Allocation Schemementioning

confidence: 99%

Traffic Models and Blocking Probabilities for Two-Fold and Three-Fold SDMA Communication Systems

Huang

Doherty

2005

Wireless Pers Commun

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Spectrum efficiency is a constant challenge in the design of wireless networks. Space-division-multipleaccess (SDMA) is a promising approach to achieve higher spectral efficiency which reuses bandwidth via multiplexing signals based on their spatial signature. Several different studies have shown that SDMA can effectively improve system capacity in a mobile environment. In this paper, we present a new Markov chain traffic model for a duplicate-at-last (DL) approach [IEE Proceedings on Communication 146 (1999) 303] in two-fold and three-fold SDMA systems. Simplified blocking probability formulations for two-fold and three-fold SDMA are also derived. Simulations based on a common method of spatial separation check for channel allocation in SDMA are presented to evaluate the probability of successfully creating two-fold and three-fold SDMA channels. The simulation, as well as analytical, results indicate that the SDMA system can reduce the blocking probability of the calls and result in more traffic loading than a traditional cellular system. The results also show that our simplified approaches not only can reduce the computational complexity, but can also accurate approximate two-fold and three-fold SDMA performance.

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“…Consequently, users' SIR could be severely degraded due to users' mobility. Previous published works have mathematically analyzed SDMA at system level by means of a multidimensional Markov model (Galvan-Tejada & Gardiner, 1999), (Galvan-Tejada & Gardiner, 2001), (Shuangmei et. al 2004); however, users' mobility together with co-channel interference due to the replicated channels within cells has not been considered.…”

Section: System-level Model For Mobile Sdma Cellular Systemsmentioning

confidence: 99%

“…The probability that i channels can be replicated k times in the admission process is denoted by p i,k . These probabilities have been extensively studied and characterized in the literature by means of mathematical analysis (Galvan-Tejada & Gardiner, 1999), (Galvan-Tejada & Gardiner, 2001), (Shuangmei et. al 2004), and it has been demonstrated that they can be expressed in terms of the probabilities that one channel could be replicated k times.…”

Section: Teletraffic Model 641 General Guidelinesmentioning

confidence: 99%