The Quality of Service (QoS) mechanisms available for use in cellular networks allow operators to tailor the level of service offered to different types of connection and to different groups of users.
Legacy cellular packet switched networks (GPRS and UMTS) tended to carry predominantly non-real time traffic, such as e-mails and Internet connections, for which the QoS requirements were often very similar, which in turn meant that the management of PS QoS wasn’t a particularly hot topic.
Modern HSPA and LTE networks are also capable of carrying real-time IP-based traffic, including Voice over LTE (VoLTE) and so the understanding of QoS in these networks has become far more important.
This session is designed to outline and recap the basic ideas of cellular PS QoS, including the use of Traffic Flow Templates (TFTs) and packet filters to define traffic and the classification of user connections into Service Data Flows (SDFs) and Traffic Flow Aggregates (TFAs).
We also explore the QoS definitions employed in LTE, including QCI and ARP, and the ways in which QoS settings for a connection are set and signalled across the network.
The discussion of the QoS architecture in LTE draws in an overview of Policy and Charging Control (PCC) and of the interworking that is possible between the QoS mechanisms used in LTE with those in legacy networks and also between the LTE user plane and the underlying Transport Network Layer (TNL).
The objective of this session is to highlight the aspects of LTE QoS that have been inherited from (and are therefore similar to) legacy QoS and to introduce some of the new network elements and procedures that are employed in 4G networks.
Who would benefit
This session will be of interest to those involved in LTE network administration and telecommunication core, transmission and access network operation and maintenance who wish to learn more about QoS mechanisms in LTE networks.
It will also be very useful for those involved with planning and managing LTE and LTE-A network upgrades and evolutions.
An engineering background with some knowledge of LTE technologies would be beneficial, as would knowledge of QoS mechanisms in legacy 2G and 3G networks.
Topic areas include
- How is user plane QoS managed in LTE?
- What are the similarities and differences with legacy network QoS?
- What are the key architectural and procedural components of LTE QoS?
- How does LTE QoS interwork with legacy and TNL QoS?
- What are the typical QoS values that are employed for common traffic types?
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