Description: Further DetailsTitle: VoIP Performance of the Relay-enhanced IEEE 802.16m Wireless Broadband SystemCondition: NewEAN: 9783958860223ISBN: 9783958860223Publisher: Verlag G. MainzFormat: PaperbackRelease Date: 12/09/2014Description: 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.Language: GermanCountry/Region of Manufacture: DEItem Height: 210mmItem Length: 148mmItem Weight: 250gAuthor: Karsten KlaggesGenre: Technology & EngineeringBook Series: Aachener Beiträge zur Mobil- und TelekommunikationRelease Year: 2014 Missing Information?Please contact us if any details are missing and where possible we will add the information to our listing.
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Book Title: VoIP Performance of the Relay-enhanced IEEE 802.16m Wireless Broa
Publication Name: VoIP Performance of the Relay-enhanced IEEE 802.16m Wireless Broa
Title: VoIP Performance of the Relay-enhanced IEEE 802.16m Wireless Broa
EAN: 9783958860223
ISBN: 9783958860223
Publisher: Verlag G. Mainz
Format: Paperback
Release Date: 12/09/2014
Release Year: 2014
Language: German
Country/Region of Manufacture: DE
Item Height: 210mm
Item Length: 148mm
Item Weight: 250g
Author: Karsten Klagges
Genre: Technology & Engineering
Series: Aachener Beiträge zur Mobil- und Telekommunikation
