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WiMax & QOS

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LR Mobile Report
Light Reading
9/10/2006

WiMax – a.k.a. the Institute of Electrical and Electronics Engineers Inc. (IEEE) 802.16 Wireless MAN technology – took a big step forward in February 2006 with the publication of the 802.16e amendment, Physical and Medium Access Control Layers for Combined Fixed and Mobile Operation in Licensed Bands. This mouthful may well announce the imminent arrival of Ethernet’s tanks on the front lawns of the 3G operators, as it extends the industry’s best-bet heavyweight metro broadband fixed-wireless access standard to nomadic and fully mobile terminals. And it does it with an extensive range of quality of service (QOS) capabilities.

These QOS capabilities matter enormously. Without sophisticated QOS, many wireless services – from legacy data services to complex interactive IMS-based services – don’t work as well as they could.

But QOS in broadband wireless access is a difficult and complicated business, as it adds an unpredictable radio link and potentially heavy user contention to the usual non-deterministic behavior of IP packet networks. Carriers therefore need to be aware of how QOS works – and what it can do – in the different flavors of 802.16, and how it relates to the more familiar 3G technologies.

And it’s crucial to understand the extent to which 802.16 allows vendors wide scope for innovation in implementing improved algorithms for better QOS.

This report aims to highlight the importance of over-the-air QOS in the WiMax operator business case, and to look at the options for implementing QOS capabilities in WiMax base-station equipment. Here’s a hyperlinked contents list:

  • Page 2: WiMax Standardization
  • Page 3: QOS in Wireless Systems
  • Page 4: The Wireless MAC Layer
  • Page 5: 802.16 Physical Layer
  • Page 6: WiMax QOS Architecture

    Webinar

    This report is based on a Webinar, WiMax & Quality of Service, moderated by Gabriel Brown, Chief Analyst, Unstrung Insider, and sponsored by Freescale Semiconductor Inc. . An archive of the Webinar may be viewed free of charge by clicking here. Related Webinar archives:

    — Gabriel Brown, Chief Analyst, Unstrung Insider

    Next Page: WiMax Standardization

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    billbobagns
    billbobagns
    12/5/2012 | 3:38:16 AM
    re: WiMax & QOS
    It seems that one of WiMAX's key advantages is it's bid rate to bw of 3.75! Yet not many engineers seem to be commenting on this. I'm not a modulation expert but would like to hear comments on this. Does it require a higher Eb/no to achive this or is it related to the "magic" which is WiMAX?

    Bill Johnson
    IPobserver
    IPobserver
    12/5/2012 | 3:38:15 AM
    re: WiMax & QOS
    Bits per hertz is one of the key marketing messages from WiMaxGǪ

    But getting the statistics like 3.75 etc assumes 64-QAM, MIMO, etc. What are the chances of the best channel conditions, while using the most advanced terminal types, existing in a real-world macro cell?

    Quite slim, is probably the answer. But it depends.

    Hence OFDMA starts to be positioned as better for additional reasons, such as:
    * Better able to scale to fill variable channel widths (i.e. not just 5 MHz and 1.25 MHz channels)
    * Higher performance in poor and variable channel conditions (as the best sub channels can be allocated for a particular terminal, as required)

    You can flip it the other way, however, and ask what is the frequency re-use of WiMax?

    Most systems seem to be designed for re-use of 2 (versus re-use of 1 for CDMA), so WiMax folk donGÇÖt generally like to talk about this.

    Also beware of WiMax supporters that like to compare what they might be able to do in future against what, say, ye olde R99 WCDMA network could do three years ago.

    Nevertheless, it is clear OFDMA is more spectrally efficient than CDMA (thatGÇÖs why itGÇÖs been adopted in the 3G roadmap).
    IPobserver
    IPobserver
    12/5/2012 | 3:38:14 AM
    re: WiMax & QOS
    I see you posted on the WiMax QOS article. You may want to play back the webinar as the expert speaker addresses how you might map a userGÇÖs or applicationGÇÖs QOS class to radio resources available in the link.

    ItGÇÖs pretty complex, especially if you want to maintain QOS during a handover.

    But I wonder if it will pay to try and be too sophisticated in real life.

    A few years ago 3G vendors were talking about how their scheduling algorithms would give them and their operator customers a competitive advantage. It doesnGÇÖt seem to have worked out that way for a longish list of reasons.
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