ABSTRACT
CONTENTS 4.1 Introduction ................................................................................................. 58 4.2 Background ................................................................................................. 58
4.2.1 QoS Definition ................................................................................. 58 4.2.2 QoS in Circuit-Switching Network .............................................. 60 4.2.3 QoS of Packet-Switched Network ................................................ 60
4.2.3.1 Connectionless Service (Ethernet or IP) ....................... 60 4.2.3.2 Asynchronous Transfer Mode ....................................... 60
4.2.4 QoS of Wireless Lan and 802.11e .................................................. 61 4.3 IEEE 802.16 .................................................................................................. 62
4.3.1 Basic Operation ............................................................................... 62 4.3.2 Service Flow .................................................................................... 64 4.3.3 QoS in IEEE 802.16 ......................................................................... 65 4.3.4 Admission Control ......................................................................... 67 4.3.5 QoS Scheduling ............................................................................... 67
4.3.5.1 UGS Scheduling ............................................................... 67 4.3.5.2 rtPS Scheduling ................................................................ 68 4.3.5.3 nrtPS Scheduling ............................................................. 69 4.3.5.4 BE Scheduling .................................................................. 69
4.4 Simulation of IEEE 802.16 QoS Operation .............................................. 69 4.4.1 Admission Control ......................................................................... 69 4.4.2 Simulation of IEEE 802.16 QoS Scheduling ................................ 72
4.5 Conclusions ................................................................................................. 74 4.6 Acknowledgments ...................................................................................... 74 References ............................................................................................................. 75
and
Over the last few years, we have seen the continual growth and demand for broadband wireless access (BWA) for residential, business, and mobile customers. With the standardization of IEEE 802.16-2004 [1], the industry formed the WiMAX Forum to support product certification of conformance to the standard and to promote interoperability among different vendors’ products. A recent data shows 48% increase in the WiMAX equipment market, from $45M in fourth quarter of 2005 to $70M in first quarter of 2006 [2]. The same report predicts that the WiMAX market will grow to more than $1B by 2009. The success of WiFi (as specified in 802.11) is evident on the wireless local area network (WLAN), and many people expect to see the same growth of WiMAX on the wide area network (WAN). In general, LAN is based on broadcast technology with connectionless services, and WAN is based on point-to-point (P2P) or point-to-multipoint (P2MP) technology with connection-oriented services.
