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:10.1109/49.490411

Cited by 28 publications

(11 citation statements)

References 12 publications

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“…A third group of protocols uses adaptive polling to distribute bandwidth among connections (e.g., [15,16] given periodically to each connection, without request, based on its expected traffic. Compared to reservation-based protocols these protocols are simpler, since there is no reservation phase, but their performance depends on the algorithm that determines the polling period for each connection.…”

Section: Medium Access Control In Wireless Atm Backgroundmentioning

confidence: 99%

“…Currently, a number of research activities are focusing on the topic of wireless ATM to resolve its problems (e.g., [4][5][6][7]). One of these activities is project Magic WAND (Wireless ATM Network Demonstrator) [8], which is investigating wireless ATM technology for customer premises networks in the framework of the Advanced Communications Technologies and Services (ACTS) program funded by the European Union.…”

Section: Quality-of-service-oriented Medium Access Control Formentioning

confidence: 99%

“…More precisely, ATM assumes fixed users, plentiful and constant bandwidth allocated dynamically based on users' needs, full duplex and point-to-point transmission, very good transmission quality (which is why error detection and error correction techniques are limited), and low physical-layer overhead. On the other hand, in a wireless environment users can move inside the covered range, the available bandwidth in the radio interface is limited and can vary based on the quality of the channel, transmission is usually half duplex and point-to-multipoint due to the lack of available frequencies, transmission quality is usually poor requiring advanced error detection and error correction techniques, and physical overhead is much higher than in fixed links, basically due to the synchronization delay between transmitter and receiver [3].Currently, a number of research activities are focusing on the topic of wireless ATM to resolve its problems (e.g., [4][5][6][7]). One of these activities is project Magic WAND (Wireless ATM Network Demonstrator) [8], which is investigating wireless ATM technology for customer premises networks in the framework of the Advanced Communications Technologies and Services (ACTS) program funded by the European Union.…”

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Quality-of-service oriented medium access control for wireless ATM networks

et al. 1997

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0163 6804/97/$10 00 © 1997 IEEE roadband and mobile communications are presently the two major drivers in the telecommunications industry. Asynchronous transfer mode (ATM) is considered the most suitable transport technique for the future broadband integrated services digital network (B-ISDN), due to its ability to flexibly support a wide range of services with qualityof-service (QoS) guarantees. On the other hand, wireless local area networks (LANs) are becoming popular for indoor data communications because of their tetherlessness and increasing transmission speed. Wireless communications have been developed to a level where offered services can now be extended beyond voice and data. The combination of wireless communications and ATM, especially in local-area environments, can provide freedom of mobility with service advantages and QoS guarantees. The main challenge of wireless ATM is to harmonize the development of broadband wireless systems with B-ISDN/ATM and ATM LANs, and offer similar advanced multimedia multiservice features for the support of time-sensitive voice communications, LAN data traffic, video, and desktop multimedia applications to the wireless user [1]. Emerging standards, such as High-Performance Radio LAN (HIPERLAN) or IEEE 802.11, have been designed to provide wireless access to corporate networks, but do not yet incorporate ATM technology over the air [2].There are several open issues in the development of wireless ATM. Most of them stem from the fact that ATM was designed with reliable fixed links in mind. More precisely, ATM assumes fixed users, plentiful and constant bandwidth allocated dynamically based on users' needs, full duplex and point-to-point transmission, very good transmission quality (which is why error detection and error correction techniques are limited), and low physical-layer overhead. On the other hand, in a wireless environment users can move inside the covered range, the available bandwidth in the radio interface is limited and can vary based on the quality of the channel, transmission is usually half duplex and point-to-multipoint due to the lack of available frequencies, transmission quality is usually poor requiring advanced error detection and error correction techniques, and physical overhead is much higher than in fixed links, basically due to the synchronization delay between transmitter and receiver [3].Currently, a number of research activities are focusing on the topic of wireless ATM to resolve its problems (e.g., [4][5][6][7]). One of these activities is project Magic WAND (Wireless ATM Network Demonstrator) [8], which is investigating wireless ATM technology for customer premises networks in the framework of the Advanced Communications Technologies and Services (ACTS) program funded by the European Union. The main components of the WAND system, as shown in Fig. 1, are:• Mobile terminals (MTs), the end-user equipment, which are basically ATM terminals with a radio adapter card • Access points (APs), the base stations of the cellular environment • An ATM ...

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Section: Medium Access Control In Wireless Atm Backgroundmentioning

confidence: 99%

Section: Quality-of-service-oriented Medium Access Control Formentioning

confidence: 99%

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confidence: 99%

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Quality-of-service oriented medium access control for wireless ATM networks

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“…More recently, sectored antennas have also been applied to wireless local-area networks (WLAN) [1], [2]. In [1], the use of directional antennas is considered to be an excellent technique for dealing with multipath propagation problems.…”

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“…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 cochannel interference Manuscript received August 1997; revised February 1998. This work was supported in part by the Brazilian Council for Scientific and Technological Research (CNPq), and in part by Bell Mobility Cellular.…”

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Antenna-sector time-division multiple access for broadband indoor wireless systems

Macedo

Sousa

1998

IEEE J. Select. Areas Commun.

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Abstract-This paper investigates a hybrid space-time-division multiple access (S-TDMA) for broadband indoor wireless systems using sectored antennas. It is shown that portables which are located in different sectors of an indoor microcell may be able to reuse the same frequency and the same time slot. However, this requires careful scheduling of packet transmissions in order to avoid transmitting packets that would jam each other during the same time slot. It is proposed that the scheduling be performed in the base station, i.e., a central control architecture. The optimum scheduling algorithm, the one that maximizes the number of packets transmitted per frame, may be in the NP-complete class of problems, so it cannot be solved in real time. Therefore, a suboptimum algorithm, called the first fit algorithm (FFA), is proposed for frame scheduling. It was found that the capacity gain achieved by the FFA is dependent on the capture threshold, which is defined as the minimum signal-to-interference ratio required in order to achieve a given packet error rate goal. The capture threshold depends on the modulation and coding schemes. This paper investigates the performance of the FFA operating with multicarrier trellis-coded modulation. An alternative multicarrier modulation is analyzed, and the FFA performance is investigated when operating with the alternative and with the conventional multicarrier through computer simulations based on measured data which were obtained with a sectorization level of ten (using ten antenna sectors in the base station). The simulations have shown that the FFA can provide a large capacity gain when operating with multicarrier trellis-coded modulation and using differential detection. For example, while previous schemes can transmit only one packet at a time, the proposed scheme can transmit, on average, more than four packets per time slot in an open indoor location, or close to three packets per time slot in a closed indoor location with internal walls of concrete blocks.Index Terms-Broadband communication, directive antennas, frequency division multiplexing, indoor radio communication, space division switching, time division multiaccess, trellis coded modulation, wireless LAN.

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