Efficient mobile WiMAX capacity estimations in a multihop environment

Abstract

The 1 new relay-based architecture for Mobile WiMAX that will allow multihop communication imposes a demanding performance requirement on relay stations. The frame structure used for transmission plays an important role in the design of multihop networks as it manages the channel access and therefore determines the resulting network capacity. In this work we firstly propose a new simple and flexible concept to integrate multihop communications into the mobile WiMAX frame structure and compare this method with other basic concepts already proposed for the upcoming IEEE 802.16j release of the standard. Secondly, we introduce efficient capacity calculations that will allow intensive system level simulations in a mobile WiMAX multihop environment for the purpose of network design. Finally, network capacity is evaluated within a new simulation model for various configurations and services allowing interesting observations about WiMAX radio efficiency. Numerical results and discussion highlight the advantages and drawbacks of the selected strategies and provide a deeper understanding on the range extension aspect of a relay network.

A Bandwidth Negotiation Scheduling for Prioritized Traffic in MMR Networks

“…where (l, m, n, p, q, s) belongs to C 1 if the following two conditions are met. The first and second terms in Equation (18) are differentiated from that the BNS allocates R(nrtPS_A) or minR(nrtPS_A) to nrtPS before invoking the ZNS procedure for rtPS. The two constraints (C 1 and C 2 ) in Equations (19) and (20) …”

“…Nevertheless, the bandwidth utilization in [17] is decreased when the hop count is increased, because the proposed scheme can't perform bandwidth allocation to the relay zone until finishing allocation to access zone. However, low-priority starvation can occur with the scheme presented in [18] when high-priority traffic grows more and more, for lack of considering the minimum bandwidth requirements corresponding to different classes.…”

“…On the other hand, Baek et al [16] presented a dynamic frame scheduling which can achieve load balancing by allocating the bandwidth amount equal to the relay zone in the current frame to the access zone in the next frame. With QoS consideration, adaptive scheduling schemes of prioritized traffic have been proposed in [17][18] for MMR networks. Nevertheless, the bandwidth utilization in [17] is decreased when the hop count is increased, because the proposed scheme can't perform bandwidth allocation to the relay zone until finishing allocation to access zone.…”

Joint time-frequency-power resource allocation for low-medium-altitude platforms-based WiMAX networks

“…Mobile WiMAX (IEEE 802.16e) uses a variable fast Fourier transform (FFT)-based orthogonal frequency division multiple access (OFDMA) technology [9]. The upcoming relay WiMAX (IEEE 802.16j) aims to deal with challenging radio propagation characteristics and low signal-to-interference and noise ratio (SINR) at the cell edge with the introduction of relay stations [10,11].…”

DiffServ-Aware Pricing for Wireless Internet

“…There exist three types of frame in RS: fragmented relay (FR), dynamically controlled relay (DCR), and out of band relay (OoBR). Among them, it is known that OoBR mode has the best performance in the throughput for a system with large bandwidth (say 20MHz) [21] . Fig.3 illustrates a brief sketch of a format for a single frame of the WiMAX system with nontransparent and OoBR modes.…”