QoS and Mobility Management Issues on Next Generation Mobile WiMAX Networks

QoS and Mobility Management Issues on Next Generation Mobile WiMAX Networks

Sajal Saha, Asish K. Mukhopadhyay, Anup Kumar Bhattacharjee
Copyright: © 2014 |Pages: 26
DOI: 10.4018/978-1-4666-4888-3.ch016
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Abstract

Selection of a MIMO (Multiple Input Multiple Output) antenna to achieve high throughput, minimize errors, and optimize data speed is an important design issue. Radio resource management to provide Quality of Service (QoS) in WiMAX involves dynamic scheduling of resources according to the user’s priority, based classes Platinum, Gold, Silver, and Bronze. Mobility and handoff management in WiMAX is another important issue involving location update, signaling traffic and service delay, and call blocking and dropping. This chapter focuses on some issues concerning MIMO configuration to improve transmit diversity, developing an appropriate scheduling algorithm to improve QoS, and presenting a novel mobility management protocol THMIP (Three Level Hierarchical Mobile IP) in IEEE 802.16e environment to reduce signaling cost with respect to QoS parameters like throughput, end-to-end delay, interference, path loss, bit error rate, and Signal-to-Noise Ratio (SNR). For the simulation, the authors use OPNET Modeler and MATLAB.
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Introduction

Ever increasing demand for higher bandwidth cannot be met with existing Digital Subscriber Line (DSL) cable Internet and other non-optical wired solutions requiring the installation of transmission cables. Wireless technologies eliminate the need for such installations. WiMAX is a solution for wireless broadband communication. WiMAX is flexible, robust, affordable and economically feasible and, therefore, assures high bandwidth communication and networking solutions of up to 48 Mbps (fixed downlink) and 7 Mbps (fixed uplink), even in the remote areas with a coverage area of 8 Km (Andrews, Ghosh, & Muhamed, 2007).

Mobile WiMAX provides 9.4 Mbps for downlink and 3.3 Mbps for uplink across a coverage area of 3 km. Its high speed data enables various multimedia applications, along with the conventional telephony service.

The original WiMAX standard, IEEE 802.16(2001), specifies a 10 to 66GHz range for fixed and nomadic services. This, however, has gradually (Yarali, Rahman, 2008) evolved to IEEE 802.16m (2011) through various stages as shown in Table 1. WiMAX operates in both licensed and unlicensed bands. Unlicensed band operates on the 2.4 Ghz and 5.8 Ghz frequencies. Licensed band operates on 700 Mhz, 2.5 Ghz.

Table 1.
Comperative study of different QoS service classes
UGSrtPSnrtPSertPSBE
Maximum sustained traffic rateYesYesYesYesYes
Minimum reserved traffic rate(Can be present)YesYesYes--
Request/transmission policyYesYesYesYes
Tolerated jitterYes----Yes--
Maximum latencyYesYesYes
Traffic priority--YesYesYesYes
Piggyback grant requestAllowedNot allowedNot allowedExtended piggybackNot allowed
Bandwidth stealingAllowedNot allowedNot allowedAllowedNot allowed
Unicast pollingPM (Poll-Me) bit can be usedAllowedAllowedAllowedAllowed
Contention -based pollingNot allowedNot allowedAllowedAllowedAllowed
Differentiated ServicesEF*AF2,AF3**AF1AF4Default
ApplicationT1/E1 transport,fixed size packet on periodic basisMPEG videoFTP with guaranteed minimum throughputVoIPHTTP,web browsing

*EF(expedidate forwarding)

**AF(Assured forwarding)

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