Distributed-queueing request update multiple access (DQRUMA) for wireless packet (ATM) networks

Abstract

In a wireless packet (ATM) network that supports an integrated mix of multimedia traffic, the channel access protocol needs to be designed such that mobiles share the limited communications bandwidth in an eficient manner: maximizing the utilization of the frequency spectrum and minimizing the delay experienced by mobiles. In this paper, we propose and study an eficient demandassignment channel access protocol, which we call DistributedQueueing Request Update Multiple Access (DQRUMA). The protocol can be used for a wide range of applications and geographic distances. Mobiles need to send requests to the base station only for packets that arrive to an empty buffer. For packets that arrive to a non-empty buffer, transmission requests are placed collision-free by piggybacking the requests with packet transmissions. The simulation results show that even with the "worst possible" traffic characteristics, the delay-throughput performance of DQRUMA is close to the best possible with any access protocol. In addition, explicit slot-by-slot announcement of the "transmit permissions" gives the base station a lot of control over the order in which mobiles transmit their packets.

A quantitative comparison of multiple access control protocols for wireless ATM

“…The DQRUMA protocol proposed by Karol et al [7] is a well-known MAC protocol for wireless ATM. In simple terms, being an FDD protocol, DQRUMA works by dividing the uplink frame into two sections with the first section for requests contention, whereas the second section for information data transmissions.…”

“…Thus, while traditional ALOHA-type MAC protocols can handle homogeneous traffic efficiently, different techniques are needed for a wireless ATM system. As such, there are a plethora of efficient MAC protocols reported in the literature that are specially designed for wireless ATM [2]- [4], [7]- [9], [13], [14], [16]. In general, there are four aspects in characterizing these MAC protocols.…”

“…• DQRUMA [7]: distributed queueing request update multiple access, a protocol that employs a novel piggybacking request update mechanism.…”

QoS-oriented packet scheduling for wireless multimedia CDMA communications

“…Packet reservation multiple access (PRMA) is a well-known time-division multiple access (TDMA) based protocol proposed for voice and data traffic. For CDMA-based systems, some methods have been proposed without considering time-division component [7]. Hybrid timedivision/code-division multiple-access schemes have been proposed in [8], [9].…”

On the performance of the DQRUMA with different scheduling algorithms for multimedia traffic in an indoor environment for W-ATM networks

“…The performance of the DQRUMA MAC protocol [2] for multimedia traffic, using the GBMD [3] scheduling policy, in a realistic environment is analysed in this paper.…”