VoIP Performance of the Relay-enhanced IEEE 802.16m Wireless Broadband System
Seiten
In 2007 the International Telecommunication Union, Radiocommunication
Sector (ITU-R) published evaluation guidelines for
future mobile broadband radio networks including a minimal
VoIP capacity that the IEEE 802.16m WiMAX system had to
meet, proven by system level simulation. These evaluation
guidelines are the foundation of this work that shows that relayenhanced
4G networks do not only meet the requirements but
exceed them by far. The key-requirement for packet based VoIP
services that has been set in the evaluation guidelines demands
that the end-to-end packet delay of at least 98% of user data
traffic stays below 50 ms.
Since 2011 proposals of ComNets to implement relays into
mobile radio networks to increase system capacity are part of
all 4G systems (LTE and WiMAX). This work investigates the
voice over IP (VoIP) capacity of the relay-enhanced WiMAX
system by system simulation. The work presents a modular
approach that has been developed by my colleagues and myself
to implement the WiMAX protocol stack, also known as
WiMAC, into the openWNS simulator. The approach is based
on atomic protocol functions that are bound to so called FU
and interconnected in a network of functional units (FUs) and
thereby implement the WiMAX protocol bit-by-bit. Besides the
performance evaluation of VoIP services based on the ITU-R
scenarios and channel model, this work also determines the
optimal radio resource configuration for up- and downlink and
furthermore investigates the impact of RS location on system
capacity. Core functions of the simulator are being validated by
comparison of equivalent results of other simulators.
Cumulative distribution functions of the end-to-end delay of
VoIP user data packets, determined by simulation show that relays
double the carried VoIP traffic load compared to a scenario
without relay stations (RSs) due to the improved prediction of
the uplink channel state that is the bottleneck of the system.
The performance enhancement is a surprise since relays increase
the end-to-end packet delay and packet error due to an
additional transmission compared to conventional single-hop
operation.
Sector (ITU-R) published evaluation guidelines for
future mobile broadband radio networks including a minimal
VoIP capacity that the IEEE 802.16m WiMAX system had to
meet, proven by system level simulation. These evaluation
guidelines are the foundation of this work that shows that relayenhanced
4G networks do not only meet the requirements but
exceed them by far. The key-requirement for packet based VoIP
services that has been set in the evaluation guidelines demands
that the end-to-end packet delay of at least 98% of user data
traffic stays below 50 ms.
Since 2011 proposals of ComNets to implement relays into
mobile radio networks to increase system capacity are part of
all 4G systems (LTE and WiMAX). This work investigates the
voice over IP (VoIP) capacity of the relay-enhanced WiMAX
system by system simulation. The work presents a modular
approach that has been developed by my colleagues and myself
to implement the WiMAX protocol stack, also known as
WiMAC, into the openWNS simulator. The approach is based
on atomic protocol functions that are bound to so called FU
and interconnected in a network of functional units (FUs) and
thereby implement the WiMAX protocol bit-by-bit. Besides the
performance evaluation of VoIP services based on the ITU-R
scenarios and channel model, this work also determines the
optimal radio resource configuration for up- and downlink and
furthermore investigates the impact of RS location on system
capacity. Core functions of the simulator are being validated by
comparison of equivalent results of other simulators.
Cumulative distribution functions of the end-to-end delay of
VoIP user data packets, determined by simulation show that relays
double the carried VoIP traffic load compared to a scenario
without relay stations (RSs) due to the improved prediction of
the uplink channel state that is the bottleneck of the system.
The performance enhancement is a surprise since relays increase
the end-to-end packet delay and packet error due to an
additional transmission compared to conventional single-hop
operation.
| Erscheint lt. Verlag | 8.12.2014 |
|---|---|
| Reihe/Serie | Aachener Beiträge zur Mobil- und Telekommunikation ; 73 |
| Sprache | englisch |
| Maße | 147 x 210 mm |
| Gewicht | 252 g |
| Einbandart | Paperback |
| Themenwelt | Technik ► Elektrotechnik / Energietechnik |
| Schlagworte | Cellular Radio networks • IEEE 802.16 System • IEEE 802.16 System, openWNS Simulator Platform • openWNS Simulator Platform • Software Platforms • Software Platforms, Cellular Radio networks |
| ISBN-10 | 3-95886-022-2 / 3958860222 |
| ISBN-13 | 978-3-95886-022-3 / 9783958860223 |
| Zustand | Neuware |
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