【资料名称】：QoS in LTE and 802.16

【资料作者】：Karthik R.M., Nadeem Akhtar,

【资料日期】：2012

【资料语言】：英文

【资料格式】：PDF

【资料目录和简介】：

Quality of Service (QoS) is a broad and loose term that refers to the “collective effect of service”, as perceived by
the user. For the purposes of this discussion, QoS more narrowly refers to meeting certain requirements typically,
throughput, packet error rate, delay, and jitter-associated with a given application. Broadband wireless networks
must support a variety of applications, such as voice, data, video, and multimedia, and each of these has different
traffic patterns and QoS requirements. In addition to the application-specific QoS requirements, networks often
need to also enforce policy-based QoS, such as giving differentiated services to users based on their subscribed
service plans. The variability in the QoS requirements across applications, services, and users makes it a challenge
to accommodate all these on a single-access network, particularly wireless networks, where bandwidth is at a
premium. From a user perspective, however, the perceived quality is based on the end-to-end performance of the
network. To be effective, therefore, QoS has to be delivered end-to-end across the network, which may include,
besides the wireless link, a variety of aggregation, switching, and routing elements between the communication end
points. IP-based networks are expected to form the bulk of the core network; hence, IP (Internet Protocol)-layer
QoS is critical to providing end-to-end service quality.
IEEE Standard 802.16 [1] defines the air interface specification for wireless metropolitan area networks (WMANs).
IEEE Standard 802.16 is designed to evolve as a set of interfaces based on a common Medium Access Control
(MAC) protocol but with physical layer specifications dependent on the spectrum of use and associated regulations.
The access and bandwidth must accommodate multiple end users. The services required by these end users are varied
in their nature and include legacy time-division multiplex (TDM) voice and data, Internet Protocol (IP) connectivity,
and packetized Voice-over-IP (VoIP). To support this variety of services, the 802.16 MAC must accommodate both
continuous and bursty traffic. Additionally, these services expect to be assigned QoS in keeping with the traffic
types.