Siemens IEEE802.11 - User Manual

Siemens IEEE802.11

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Table of Contents:

  • Page 3 – Lots of serious WLAN activities have been started
  • Page 4 – Outline
  • Page 6 – Generic Internet network architecture; Peer
  • Page 7 – Layering means encapsulation
  • Page 8 – IETF
  • Page 9 – IP based network architecture
  • Page 11 – What is unique about wireless?; Multiple international regulatory requirements
  • Page 12 – Wireless LAN Standardization
  • Page 17 – ETSI BRAN; WIG
  • Page 18 – Part 3: Physical layer
  • Page 19 – Frequency Hopping Spread Spectrum; – 79 non overlapping frequencies; Direct Sequence Spread Spectrum; – Spreading with 11 Bit barker Code; – Basic parameters identical to
  • Page 20 – Band is divided into at least 75 channels
  • Page 21 – RF Energy is Spread by XOR of Data with PRN Sequence; Signal
  • Page 22 – DSSS Transmit Spectrum and Channels
  • Page 25 – Spectrum Designation in the 5 GHz range
  • Page 27 – ... when will 5 GHz WLANs come?; against ‘error proune’ networks.
  • Page 28 – PHY Terminology
  • Page 30 – Part 4: Medium Access Control; Basic Access Protocol Features
  • Page 31 – receiver through separate RTS and CTS Control Frames.
  • Page 32 – Next Frame; – Exponential Backoff window increases for
  • Page 33 – Src
  • Page 35 – STA A; Solution – Optional use of the; “Hidden Node” Provisions
  • Page 36 – EDCF (Enhanced Distributed Coordination Function)
  • Page 37 – PCF and DCF networks will defer to each other
  • Page 38 – – meets predefined service rate, delay and/or jitter
  • Page 39 – Frame Formats
  • Page 40 – Address Field Description; Addr 1 = All stations filter on this address.
  • Page 41 – Summary: MAC Protocol Features; Point Coordination Function (PCF) option for time bounded data
  • Page 42 – Part 5: MAC layer management
  • Page 43 – Infrastructure Beacon Generation; APs send Beacons in infrastructure networks.
  • Page 44 – – Used for Point Coordination Timing
  • Page 45 – Scanning
  • Page 46 – Steps to Association:; APs send Probe Response.; Active Scanning Example
  • Page 47 – Power Management Considerations; consumption over time.
  • Page 48 – Power Management Approach
  • Page 49 – Power Management Procedure
  • Page 50 – MAC Management Frames
  • Page 51 – Part 6: WLAN Mobility
  • Page 53 – Extends wireless coverage area and enables roaming
  • Page 54 – ORFDOGLVWULEXWLRQQHWZRUN; If Reassociation Response is successful; then station has roamed to the new AP; If AP accepts Reassociation Request; normally old AP is notified through Distribution System
  • Page 55 – Distribution System
  • Page 56 – Part 7: WLAN security
  • Page 57 – IEEE802.11 Privacy and Access Control; authentication extensions.
  • Page 58 – WEP privacy mechanism
  • Page 59 – WDWLRQVHQGVDXWKHQWLFDWLRQUHTXHVW; Shared key authentication; Shared key authentication requires WEP
  • Page 60 – Shortcomings of plain WEP security
  • Page 61 – Additional enhancement to existing IEEE802.11 functions:; hardware for higher security requirements, or
  • Page 62 – A last word about WLAN security:; Even IEEE802.11i may not be sufficient for public hot-spots:
  • Page 63 – Summary: MAC Functionality; Independent and Infrastructure configuration support
  • Page 64 – Part 8: Public hotspot operation; Becoming a WLAN operator is easy.
  • Page 66 – A web-browser will likely be available on all notebooks.
  • Page 67 – – Most commercial installations are much more expensive
  • Page 68 – How does your favorite storefront look like?; Too much security might hinder your business!
  • Page 70 – LQWHUQHW; auth
  • Page 74 – Part 9: WLAN – UMTS Interworking
  • Page 75 – UMTS and Wireless LAN are different.
  • Page 76 – WLAN as just another radio access technology of UMTS
  • Page 77 – tight coupling; – agreement with siteowner; Dynamics of growth may differ.; – new standards necessary
  • Page 78 – WLAN is much cheaper than 2G/3G; ORJDULWKPLFVFDOH
  • Page 80 – Revenues without competing against aggressive WLAN operators.; Siemens contributed ‚loose coupling‘ to standardization.
  • Page 81 – – SGSN or MSC functionality
  • Page 83 – Standards for WLAN/UMTS interworking; Requirements of 3GPP system – WLAN interworking.; generation cellular; coupling’ principle established
  • Page 84 – The end; Thank you for your attention.
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Maximilian Riegel

ICM Networks, Advanced Standardization

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Summary

Page 3 - Lots of serious WLAN activities have been started

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 3 © Siemens, 2002 Prolog:WLAN has taken off ... n Lots of serious WLAN activities have been started – All big players have products (Cisco, Intel, …)– Integrated WLAN solutions appearing (Apple, IBM, ...) n The prediction ha...

Page 4 - Outline

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 4 © Siemens, 2002 Outline n Part 1: Wireless Internet System Architecture n Part 2: IEEE802.11 Overview n Part 3: Physical Layer n Part 4: Medium Access Control n Part 5: MAC Layer Management n Part 6: WLAN Mobility n Part 7...

Page 6 - Generic Internet network architecture; Peer

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 6 © Siemens, 2002 Internet/Web Applications Generic Internet network architecture link phy ip tcp http www link phy ip link phy ip link phy ip link phy ip 802.2 link phy ip 802.2 ip tcp http www Peer (Client) Peer (Web-Serve...

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