Technology - Wireless - Broadband 5 - 802-11 QoS, MIMO & Propagation

Synopsis

This report discusses 802.11’s new QoS arrangements (WMM) and enhancements for greater performance using MIMO (Multiple In Multiple Out) multi-antennae systems using 802.11n. We discuss the behaviour of 2.45 and 5GHz microwaves, with special reference to outdoor propagation, polarisation, point-to-point links, antennae and the Fresnel zone.

Table of Contents

  • 1. Synopsis
  • 2. 802.11e - Quality of Service (QoS)
    • 2.1 WiFi Multimedia - WMM
    • 2.2 Four priority levels
    • 2.3 WMM Baseline - Enhanced DCF Channel Access (EDCA)
    • 2.4 HCF Controlled Channel Access (HCCA)
    • 2.5 Contention Free Bursts
    • 2.6 Direct Link Protocol (DLP) and piggybacking
    • 2.7 WMM Scheduled Access
    • 2.8 WMM Power Save
    • 2.9 Fast roaming and other enhancements
  • 3. 802.11n - MIMO
    • 3.1 The Enhanced Wireless Consortium
    • 3.2 Other enhancements in 802.11n
      • 3.2.1 Frame Aggregation
      • 3.2.2 Block Acknowledgement
      • 3.2.3 Short guard intervals
    • 3.3 Multipath required for enhanced performance
    • 3.4 MIMO for long distance links?
    • 3.5 Reach and diversity
    • 3.6 Adaptive Antennae Systems
  • 4. Propagation in and near buildings
  • 5. Point-to-point links
    • 5.1 Propagation and Fresnel zone
    • 5.2 Antennae and cabling
    • 5.3 Polarisation
  • 6. Related reports
    • 6.1 Market reports
    • 6.2 Technology reports

Related Reports

Purchase this Report

US$50.00

Licence Information

Focus Report Profile

Technologies

Mobile & Wireless Broadband and Media

Number of pages 11

Status Archived

Last updated 16 Dec 2008
Update History

Analyst: Robin Whittle

Share this Report

Purchase with Confidence

Paul has been a consistent champion of improving broadband in Australia, and is most deserving of the industry's ongoing support.

B Beckor, Callpoint, Australia

Special Offers

Caribbean - Telecoms, Mobile, and Broadband - Statistics and Analyses
US$795.00 until 30 Oct 2019
(normal price US$1,590.00)

Venezuela - Telecoms, Mobile and Broadband - Statistics and Analyses
US$575.00 until 30 Oct 2019
(normal price US$1,150.00)

Sample Reports

A selection of downloadable samples from our Annual Publications catalogue.


Download a Sample Report

More than 4,000 customers from 140 countries utilise BuddeComm Research

Are you interested in BuddeComm's Custom Research Service?

News & Views

Have the latest telecommunications industry news delivered to your inbox by subscribing to Paul's FREE weekly News & Views.