Client-Weighted Medium-Transparent MAC Protocol for User-Centric Fairness in 60  GHz Radio-Over-Fiber WLANs

Abstract

We present a novel Client-Weighted Medium-Transparent MAC (CW-MT-MAC) protocol with enhanced fairness service delivery properties accompanied by a low-loss Remote Access Unit (RAU) architecture for use in indoor, Gbps capable, 60 GHz Radio-over-Fiber (RoF) Wireless Local Access Networks (WLANs). Our approach relies on incorporating a Client Weighted Algorithm (CWA) in the optical capacity allocation mechanism employed in the MT-MAC scheme, so as to distribute the available wavelengths to the different antenna units according to the total number of active users served by each individual antenna. The protocol's throughput and delay fairness characteristics are evaluated and validated through both simulations and analytic modeling for saturated network traffic operational conditions. In addition, extended simulation-based performance analysis for nonsaturated network conditions and for different enduser distributions, traffic loads and available optical wavelengths at 1 Gbps data rates are presented. Our results confirm that complete throughput equalization can be achieved even for highly varying user population patterns when certain wavelength availability conditions are satisfied. At the same time, the presented scheme manages to equalize the average packet delays amongst packets generated by all RAUs while concurrently dropping the Packet Delay Variation (PDV) metric that is essential for Quality of Service (QoS) delivery. Finally the Manuscript received October 9, 2001.

Bottom-layer solutions for 60 GHz millimeter-wave wireless networks: modulation and multiplexing access techniques

“…Some are briefly discussed here, in particular those that share similar attributes with VST-TDMA. The protocols discussed are: client-weighted medium-transparent MAC protocol (CW-MT-MAC) [29], process-stacking multiplexing access (PSMA) [20], Dynamic TDMA Scheduling (D-TDMA Scheduling or DTS) [13], packet reservation multiple access/dynamic allocation (PRMA/DA) [32], resource auction multiple access (RAMA) [4], slot reservation demand assignment multiple access (SRDAMA) [34], quality of service collision-free Receiver-Oriented MAC (QoS-CROMA) [18], and time division multiple access/frequency division duplexing (TDMA/FDD) [6], sensor-MAC (S-MAC) [63], timeout-MAC (T-MAC) [55], pattern-MAC (P-MAC) [65], Medium Reservation Preamble based MAC (MRPM) [51], adjustable sleep-mode MAC (AS-MAC) [64], Aloha [3], and Slotted Aloha [45]. CW-MT-MAC is a cross-layer (physicaldata link) MAC protocol designed specifically for 60-GHz cells.…”

“…Another SN0 SN1 SN2 SN3 WAP SN4 Fig. 9 Modeled network topology, four serviced nodes and one wireless access point protocol compared is CW-MT-MAC, which is recent work (2014) in 60-GHz WLAN MAC protocols [29], which is an improvement of a previous proposal [30]. CW-MT-MAC has several similarities to VST-TDMA including: the wireless transmission is multiplexed in time, the superframe has a variable length (similar to variable time slot duration, but with less granularity), and it is designed specifically for 60 GHz transmissions.…”

“…Additionally, even though the throughput is normalized, both work have chosen 1 Gbps as the channel bitrate for the simulations. Among the results obtained by [29], this work uses the best results reported in this publication, which is the CW-MT-MAC case using a wavelength to remote antenna unit (RAU) ratio (λ/R) of 4:5 (80 %), that is, for every four available wavelengths there are five RAUs (see Sect. 2.2 or [29] for more information).…”

“…Among the results obtained by [29], this work uses the best results reported in this publication, which is the CW-MT-MAC case using a wavelength to remote antenna unit (RAU) ratio (λ/R) of 4:5 (80 %), that is, for every four available wavelengths there are five RAUs (see Sect. 2.2 or [29] for more information). The network topology consists of one WAP and five SNs as shown in Fig.…”

“…The network topology consists of one WAP and five SNs as shown in Fig. 9, this is to match nodes per RAU from [29]. A simulation scenario is configured to observe how the protocol handles the traffic with different data transmission loads by observing the resulting throughput.…”