Abstract
WiMAX networks are deployed for commercial use because of its nature high bandwidth. This requirement invokes the application level changes i n QoS provisioning techniques. The objective of the broadband wireless technologies is to ensure th e end to end Quality of Service (QoS) for the service classes. WiMAX is a revolution in wireless networks, which could support real time multimedia services. In order to provide QoS suppor t and efficient usage of system resources an intelligent scheduling algorithm is needed. The des ign of the detailed scheduling algorithm is a major focus for researchers and service providers. In thi s study, a channel aware cross-layer scheduling algorithm for WiMAX networks has been proposed. This scheme employs the Signal to Noise Ratio (SNR) value, which allocates the bandwidth based on the information about the quality of the channel and the service requirements of each connection. Th e proposed algorithm is described in detail and evaluated, through a series of simulations. The QoS parameters of throughput, bandwidth efficiency and transmission efficiency have been measured in s imulation.
Highlights
World Wide Interoperability for Microwave Access (WiMAX) is an IEEE standard (IEEE 802.16d/e) that promises high bandwidth solution with long range for metropolitan area networks
The experiment is repeated only for the following service flows defined by IEEE 802.16e standards Best Effort (BE), real time data Polling Services (rtPS) and Unsolicited Grant Services (UGS)
A cross-layer Quality of Service (QoS) based scheduling algorithm has been compared with Weighted Round Robin (WRR) in WiMAX using the NS2 simulator
Summary
World Wide Interoperability for Microwave Access (WiMAX) is an IEEE standard (IEEE 802.16d/e) that promises high bandwidth solution with long range for metropolitan area networks. The different types of standards for PHY supports are Single Carrier (SC), Single Carrier Access (SCA), Orthogonal Frequency Division Multiplexing (OFDM) and Orthogonal Frequency Division Multiple multipoint mode. The responsibility of scheduling and BW management is to allocate the resources efficiently based on the QoS requirement of the service classes. There are five service classes which are defined in IEEE802.16e standard. They are as follows: Corresponding Author: R. Real Time Data Polling Services (RTPS): Designed to support real time services that generates variable size data packets on a periodic basis like MPEG but insensitive to delay. Extended Real Time Polling Services (ERTPS): Designed to support real time applications with variable data rates which require guaranteed data and delay.
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