Novel Optimized Cross-Layer Design with Maximum Weighted Capacity Based Resource Allocation for AMC/HARQ Wireless Networks

Reham A El-Mayet,Hesham M El-Badawy,Salwa H Elramly

doi:10.4236/wet.2013.42012

Reham A El-Mayet, Hesham M El-Badawy + Show 1 more

Open Access

https://doi.org/10.4236/wet.2013.42012

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Abstract

To provide quality-of service (QoS) guarantees for heterogeneous applications, most recent wireless communications technologies and standards combine the error-correcting capability of hybrid automatic repeat request (HARQ) schemes at the data link layer (DLL) with the adaptation ability of the adaptive modulation and coding (AMC) modes at the physical layer (PHY) layer. This paper aims to investigate the aggregated system capacity as well as the breakdown of this capacity for different ACM modes in each HARQ scheme. This investigation was done by using maximum weighted capacity (MWC) resource allocation at the PHY layer in conjunction with a novel packet error rate (PER)-based scheduling at the medium access control (MAC) layer. As a result, the dominant AMC mode corresponding to channel SNR was available.

Highlights

In order to enhance the throughput of the wireless communication system, link adaptation (LA) technologies are considered at the physical layer, and at the upper-protocol-layers such as data link layer when designing the wireless networks
In order to investigate the proposed cross-layer optimization scheme, numerical results will be deduced for hybrid automatic repeat request (HARQ) schemes over a Nakagami-m fading channel
signal-tonoise ratio (SNR) Margins for Different HARQ Modes In order that, the different modulation and coding schemes is assessed in the case of having only the Additive White Gaussian Noise (AWGN)

Summary

Introduction

In order to enhance the throughput of the wireless communication system, link adaptation (LA) technologies are considered at the physical layer, and at the upper-protocol-layers such as data link layer when designing the wireless networks. Cross-layer design (CLD) which combines AMC and HARQ is extensively studied in order to match the transmission rates to timevarying wireless communication channel conditions [2]. It is a well suited solution to enforce the link quality at the medium access control (MAC) layer in wireless environments, and has been adopted in some towards-4G standards (3GPP LTE Release 8, for instance) [3]. It can be considered as a combination of forward error correction (FEC) and automatic repeat request (ARQ) which is used to improve reliability [1]

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