A multiple access scheme for wireless access to a broadband ATM LAN based on polling and sectored antennas

Mahmoud, Ashraf; Falconer, D.D.; Mahmoud, S.A.

doi:10.1109/pimrc.1995.477308

Cited by 12 publications

(9 citation statements)

References 10 publications

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“…Sectored Antennas have been used for some time in mobile cellular systems as a means of reducing interference and con sequently increasing system capacity. More recently, sectored antennas have also been applied to Wireless Local Area Net works (WLAN) [I] [2]. In [1] the use of directional antennas is considered to be an excellent technique for dealing with multipath propagation problems.…”

Section: Introductionmentioning

confidence: 99%

“…In [1] the use of directional antennas is considered to be an excellent technique for dealing with multipath propagation problems. In [2] sectored antennas are proposed in order to combat the severe co-channel interfer ence arising from a small frequency reuse factor. Although [1] and [2] propose different rules for the use of sectored an tennas, the final goal in both cases is to achieve an increase in system capacity.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The multiple access schemes described in [1] and [2] allow transmission/reception in only one of the antenna sectors at a time, usually in the one that provides the best communication channel between the base station and a given portable. Fig ure I-a shows sectored antennas similar to those in [l] and [2]. The RF switch matrix used to select the desired antenna from the set can be fabricated compactly and inexpensively using either a Gallium Arsenide Monolithic Microwave Inte grated Circuit (GaAs MMIC) or microwave diode switching elements [4].…”

Section: Introductionmentioning

confidence: 99%

“…How ever, as we explain in Section 2, this kind of spectrum sharing requires compatible portables. The schemes proposed in [1] and [2] employ sectored an tennas in both the base station and portable modules. The scheme proposed in [3] assumes that this approach causes the system to become excessively complex, and, due to the size of the sectored antenna system, not suitable for a portable ter minal.…”

Section: Introductionmentioning

confidence: 99%

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Broadband Indoor Wireless System with In-Cell Frequency Reuse Based on Sectored Antennas

Macedo¹,

Sousa²

1997

Journal of Communication and Information Systems

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frame, is in the NP-complete class of problems, so it can not be solved in real time. Therefore, a sub-optimum algo rithm named First Fit Algorighm is proposed for the frame scheduling problem. The problem is investigated experimen tally for a sectorization level of ten (using ten antenna sectors in the base station). A statistical model of multipath propaga tion is used to extend the results to other levels of sectoriza tion. The proposed system can significantly increase capacity when compared with systems that can transmit a single data packet per time slot. For example, while previous systems can transmit only one packet at a time, the proposed system can transmit on average close to three packets per time slot when operating with a capture threshold of 10 dB and ten an tenna sectors in a closed indoor location with internal walls of concrete blocks.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Broadband Indoor Wireless System with In-Cell Frequency Reuse Based on Sectored Antennas

Macedo¹,

Sousa²

1997

Journal of Communication and Information Systems

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Buffer Occupancy Analysis for a Broadband Polling-Based WLAN

Mahmoud

Falconer

Mahmoud

2003

Network Control and Engineering for QoS, Security and Mobility II

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Driven by growing demands for high-bandwidth multimedia services, Wireless Local Area Networks (WLANs) are now being designed with access schemes catering for both synchronous and asynchronous services. A pollingbased Medium Access Control (MAC) protocol for broadband indoor WLAN is briefly presented. Analytical evaluation of the embedded queueing model is performed under some assumptions, and the wireless terminal buffer size probability mass function is derived as a function of the cellloss probability, frame length and structure, and the input traffic statistics. The analysis considers a finite buffer size terminal case, and presents statistics of buffer blocking and mean number traffic cells in buffer. The analysis considers renewal input traffic models such as the generalized batched-Bernoulli models where traffic arrivals during interservice times are statistically independent.

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