Siemens IEEE802.11 - Manuals

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...

Page 7 - Layering means encapsulation

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 7 © Siemens, 2002 user data appl. header tcp header application data ip header Ethernet ip header tcp header appl. header user data HTML http tcp ip 802.2 TCP segment IP datagramm Ethernet frame 64 - 1500 bytes 14 bytes 20 b...

Page 8 - IETF

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 8 © Siemens, 2002 IEEE802.11 - seamless integration into the Internet KWPO [PO [VO VPLO +773 )73 6073 '16 6103 7&3 6'+ *60 $70 ,6'1 1)6 8'3 HQFDS 333 $53 W3C IETF ITUETSIATMF 6&73 08$ ,3 ,QWHUQHW www

Page 9 - IP based network architecture

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 9 © Siemens, 2002 link phy link phy link phy link phy link phy link phy link phy link phy tcp http www tcp http www IP based network architecture ip ip ip ip ip ip ip ip N-DATA.request N-DATA.indication N-DATA N-DATA N-DATA ...

Page 11 - What is unique about wireless?; Multiple international regulatory requirements

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 11 © Siemens, 2002 What is unique about wireless? n Difficult media– interference and noise– quality varies over space and time– shared with “unwanted” 802.11 devices– shared with non-802 devices (unlicensed spectrum, microw...

Page 12 - Wireless LAN Standardization

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 12 © Siemens, 2002 Part 2: IEEE802.11 Overview n Wireless IEEE802.11 Standard n IEEE802.11 Configurations n IEEE802.11 Architecture Overview n IEEE802.11 Protocol Architecture n Wireless LAN Standardization

Page 17 - ETSI BRAN; WIG

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 17 © Siemens, 2002 Wireless LAN Standardization 0$& 3+< Current standardization topics HiperLAN/2 DFS & TPC 5 GHz 54 Mbit/s ETSI BRAN 8076,QWHJUDWLRQ 802.11f: Inter Access Point Protocol IEEE 802.11 IEEE 802.11 2,...

Page 18 - Part 3: Physical layer

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 18 © Siemens, 2002 Part 3: Physical layer n IEEE802.11 2.4 GHz & 5 GHz Physical Layers n Frequency Hopping Spread Spectrum n Direct Sequence Spread Spectrum n DSSS Transmit Spectrum and Channels n IEEE802.11a 5GHz PHY La...

Page 19 - Frequency Hopping Spread Spectrum; – 79 non overlapping frequencies; Direct Sequence Spread Spectrum; – Spreading with 11 Bit barker Code; – Basic parameters identical to

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 19 © Siemens, 2002 IEEE802.112.4 GHz & 5 GHz Physical Layers Time Frequenc y n 2.4 GHz Frequency Hopping Spread Spectrum – 2/4 FSK with 1/2 Mbps – 79 non overlapping frequencies of 1 MHz width (US) Frequency Pow e r Freq...

Page 20 - Band is divided into at least 75 channels

, © Siemens, 2002 A M PLI TUDE FREQUENCY TIME 1 2 3 4 5 6 7 8 9 10 11 12 f1 f2 f3 f4 f5 Frequency Hopping Spread Spectrum n 2.4GHz band is 83.5MHz wide (US & Europe) n Band is divided into at least 75 channels n Each channel is < 1MHz wide n Transmitters and receivers hop in unison among chan...

Page 21 - RF Energy is Spread by XOR of Data with PRN Sequence; Signal

, © Siemens, 2002 11 chips 1 bit period 11 chips 1 bit period Data PRN Out 11 Bit Barker Code (PRN*) 0100100011110110111000 Transmitter baseband signal after spreading Transmitter baseband signal before spreading Receiver baseband signal after matched filter (De-spread) Receiver baseband signal befo...

Page 22 - DSSS Transmit Spectrum and Channels

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 22 © Siemens, 2002 DSSS Transmit Spectrum and Channels fc fc -11 MHz fc -22 MHz Sinx/x fc +11 MHz fc +22 Mhz 0 dBr -30 dBr -50 dBr Unfiltered TransmitSpectrumMask &DQQHO 86$ (76, -DSDQ 0+] 0+] 1$ 0+] 0+] 1$ 0+] 0+] 1$ 0+...

Page 25 - Spectrum Designation in the 5 GHz range

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 25 © Siemens, 2002 )UHT*+] (XURSH 86$ -DSDQ ,QGRRUP: 2XWGRRU:(,53 2XWGRRU:(,53 0D[SHDN 7[SRZHU 2XWGRRU:(,53 ,QGRRUP:(,53 0D[PHDQ 7[SRZHU ')6 73& ')6 73& ')6 '\QDPLF)UHTXHQF\6HOHFWLRQ 73& 7UDQVPLW3RZHU&RQWURO ...

Page 27 - ... when will 5 GHz WLANs come?; against ‘error proune’ networks.

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 27 © Siemens, 2002 … when will 5 GHz WLANs come? n IEEE802.11b (2.4 GHz) is now taking over the market. n There are developments to enhance IEEE802.11b for– more bandwidth (up to 54 Mbit/s)– QoS (despite many applications do...

Page 28 - PHY Terminology

, © Siemens, 2002 PHY Terminology n FHSS Frequency Hoping Spread Spectrum n DSSS Direct Sequence Spread Spectrum n OFDM Orthogonal Frequency Division Multiplex n PPM Pulse Position Modulation n GFSK Gaussian Frequency Shift Keying n DBPSK Differential Binary Phase Shift Keying n DQPSK Differential Q...

Page 30 - Part 4: Medium Access Control; Basic Access Protocol Features

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 30 © Siemens, 2002 Part 4: Medium Access Control n Basic Access Protocol Features n CSMA/CA Explained n CSMA/CA + ACK protocol n Distributed Coordination Function (DCF) n „Hidden Node“ Provisions n IEEE802.11e: MAC Enhanceme...

Page 31 - receiver through separate RTS and CTS Control Frames.

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 31 © Siemens, 2002 Basic Access Protocol Features n Use Distributed Coordination Function (DCF) for efficient medium sharing without overlap restrictions.– Use CSMA with Collision Avoidance derivative.– Based on Carrier Sens...

Page 32 - Next Frame; – Exponential Backoff window increases for

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 32 © Siemens, 2002 DIFS Contention Window Slot time 'HIHU$FFHVV Backoff-Window Next Frame 6HOHFW6ORWDQG'HFUHPHQW%DFNRIIDVORQJDVPHGLXPLVLGOH SIFS PIFS DIFS Free access when medium is free longer than DIFS Busy Medium CSMA/CA ...

Page 33 - Src

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 33 © Siemens, 2002 Ack Data Next MPDU Src Dest Other Contention Window Defer Access Backoff after Defer DIFS SIFS DIFS CSMA/CA + ACK protocol n Defer access based on Carrier Sense.– CCA from PHY and Virtual Carrier Sense sta...

Page 35 - STA A; Solution – Optional use of the; “Hidden Node” Provisions

, © Siemens, 2002 STA “B” cannot receive data from STA “A” Problem – Stations contending for the medium do not Hear each other STA “B” STA“A” RTS-Range Access Point CTS-Range RTS CTS STA A AP STA B DIFS STA “B” cannot detect carrier from STA “A” Next MPDU Time period to defer accessis based on durat...

Page 36 - EDCF (Enhanced Distributed Coordination Function)

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 36 © Siemens, 2002 IEEE802.11e: MAC Enhancementsfor Quality of Service (EDCF) – differentiated DCF access to the wireless medium for prioritized traffic categories (4 different traffic categories) – output queue competes for...

Page 37 - PCF and DCF networks will defer to each other

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 37 © Siemens, 2002 Beacon Contention Free Period Contention Period CFP repetition interval D1+Poll U1+ACK D2+Poll Stations Access Point U2+ACK CF end Point Coordination Function (PCF) n Optional PCF mode provides alternating...

Page 38 - – meets predefined service rate, delay and/or jitter

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 38 © Siemens, 2002 IEEE802.11e: MAC Enhancements for Quality of Service (HCF) – only usable in infrastructure QoS network configurations– to be used during both the contention period (CP) and the contention free period (CFP)...

Page 39 - Frame Formats

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 39 © Siemens, 2002 FrameControl Duration ID Addr 1 Addr 2 Addr 3 Addr 4 6HTXHQFH &RQWURO CRC FrameBody 2 2 6 6 6 6 2 0-2312 4 802.11 MAC Header Bytes: Protocol Version Type SubType To DS Retry Pwr Mgt More Data WEP Rsvd ...

Page 40 - Address Field Description; Addr 1 = All stations filter on this address.

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 40 © Siemens, 2002 To DS From DS Address 1 Address 2 Address 3 Address 4 0 0 DA SA BSSID N/A 0 1 DA BSSID SA N/A 1 0 BSSID SA DA N/A 1 1 RA TA DA SA Address Field Description n Addr 1 = All stations filter on this address. n...

Page 41 - Summary: MAC Protocol Features; Point Coordination Function (PCF) option for time bounded data

, © Siemens, 2002 Summary: MAC Protocol Features n Distributed Coordination Function (DCF) provides efficientmedium sharing– Use Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA)– MAC uses the PHY layer Clear Channel Assessment (CCA) function for CSMA/CA n Robust for interference– CSM...

Page 42 - Part 5: MAC layer management

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 42 © Siemens, 2002 Part 5: MAC layer management n Infrastructure Beacon Generation n Timing Synchronization Function n Scanning n Active Scanning Example n Power Management Considerations n Power Management Approach n Power ...

Page 43 - Infrastructure Beacon Generation; APs send Beacons in infrastructure networks.

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 43 © Siemens, 2002 Time Axis Beacon Interval X X X X "Actual time" stamp in Beacon Beacon Busy Medium Infrastructure Beacon Generation n APs send Beacons in infrastructure networks. n Beacons scheduled at Beacon Inte...

Page 44 - – Used for Point Coordination Timing

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 44 © Siemens, 2002 Timing Synchronization Function (TSF) n All stations maintain a local timer.– Used for Power Management • All station timers in BSS are synchronized – Used for Point Coordination Timing • TSF Timer used to...

Page 45 - Scanning

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 45 © Siemens, 2002 Scanning n Scanning required for many functions.– finding and joining a network– finding a new AP while roaming– initializing an Independent BSS (ad hoc) network n 802.11 MAC uses a common mechanism for al...

Page 46 - Steps to Association:; APs send Probe Response.; Active Scanning Example

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 46 © Siemens, 2002 n Initial connection to an Access Point– Reassociation follows a similar process Steps to Association: Station sends Probe. APs send Probe Response. Station selects best AP. Station sends AssociationReques...

Page 47 - Power Management Considerations; consumption over time.

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 47 © Siemens, 2002 Power Management Considerations n Mobile devices are battery powered.– Power Management is important for mobility. n Current LAN protocols assume stations are always ready to receive.– Idle receive state d...

Page 48 - Power Management Approach

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 48 © Siemens, 2002 Power Management Approach n Allow idle stations to go to sleep– station’s power save mode stored in AP n APs buffer packets for sleeping stations.– AP announces which stations have frames buffered– Traffic...

Page 49 - Power Management Procedure

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 49 © Siemens, 2002 TIM TIM-Interval Time-axis Busy Medium Tx operation AP activity TIM TIM TIM DTIM DTIM DTIM interval PS Station Broadcast PS-Poll Broadcast Power Management Procedure n Stations wake up prior to an expected...

Page 50 - MAC Management Frames

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 50 © Siemens, 2002 MAC Management Frames n Beacon – Timestamp, Beacon Interval, Capabilities, ESSID, Supported Rates, parameters – Traffic Indication Map n Probe – ESSID, Capabilities, Supported Rates n Probe Response – Time...

Page 51 - Part 6: WLAN Mobility

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 51 © Siemens, 2002 Part 6: WLAN Mobility n IEEE802.11 Ad Hoc Mode n IEEE802.11 Infrastructure Mode n Mobility inside a WLAN ‚hotspot‘ by link layer functions... n IEEE802.11f: Inter-Access Point Protocol (IAPP)

Page 53 - Extends wireless coverage area and enables roaming

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 53 © Siemens, 2002 BSS-A Distribution System (DS) BSS-B Server IEEE802.11 Infrastructure Mode n Access Points (AP) and stations (STA) n BSS (Basic Service Set): a set of stations controlled by a single coordination function ...

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

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 54 © Siemens, 2002 Mobility inside a WLAN ‘hotspot’ by link layer functions... n Station decides that link to its current AP is poor ORFDOGLVWULEXWLRQQHWZRUN n Station uses scanning function to find another AP − or uses info...

Page 55 - Distribution System

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 55 © Siemens, 2002 IEEE802.11f: Inter-Access Point Protocol (IAPP) n IAPP defines procedures for– context transfer between APs when stations move– automatic configuration handling of access points Distribution System Server ...

Page 56 - Part 7: WLAN security

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 56 © Siemens, 2002 Part 7: WLAN security n IEEE802.11 Privacy and Access Control n WEP privacy mechanism n Shared key authentication n Shortcomings of plain WEP security n IEEE802.11i: Robust Security Network (RSN) n A last ...

Page 57 - IEEE802.11 Privacy and Access Control; authentication extensions.

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 57 © Siemens, 2002 IEEE802.11 Privacy and Access Control n Goal of 802.11 was to provide “Wired Equivalent Privacy” (WEP)– Usable worldwide n 802.11 provides for an authentication mechanism– To aid in access control.– Has pr...

Page 58 - WEP privacy mechanism

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 58 © Siemens, 2002 3UHDPEOH 3/&3 +HDGHU 0$&+HDGHU &5& 3D\ORDG (QFU\SWHG ,9 ,&9 &\SKHUWH[W .,' ,QWHJULW\$OJRULWKP :(3 351* ,9 ,9 6HFUHW.H\ + &LSKHUWH[W ,&9 3ODLQWH[W ,&9 ,&9" 3ODLQW...

Page 59 - WDWLRQVHQGVDXWKHQWLFDWLRQUHTXHVW; Shared key authentication; Shared key authentication requires WEP

, © Siemens, 2002 Access Point Secret Key Loaded Locally Station Secret Key Loaded Locally 6WDWLRQVHQGVDXWKHQWLFDWLRQUHTXHVW $3VHQGVFKDOOHQJHWH[WJHQHUDWHG ZLWKWKH:(3DOJRULWKP 6WDWLRQHQFU\SWVFKDOOHQJHWH[W DQGVHQGVLWWRWKH$3 $3GHFU\SWVWKHHQFU\SWHGFKDOOHQJHWH[W $XWKHQWLFDWLRQVXFFHVVIXOLIWH[WPDWFKHVRULJL...

Page 60 - Shortcomings of plain WEP security

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 60 © Siemens, 2002 Shortcomings of plain WEP security n WEP unsecure at any key length– IV space too small, lack of IV replay protection– known plaintext attacks n No user authentication– Only NICs are authenticated n No mut...

Page 61 - Additional enhancement to existing IEEE802.11 functions:; hardware for higher security requirements, or

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 61 © Siemens, 2002 IEEE802.11i:Robust Security Network (RSN) Additional enhancement to existing IEEE802.11 functions: n Data privacy mechanism:– TKIP (Temporal Key Integrity Protocol) to enhance RC4-based hardware for higher...

Page 62 - A last word about WLAN security:; Even IEEE802.11i may not be sufficient for public hot-spots:

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 62 © Siemens, 2002 A last word about WLAN security: n Even IEEE802.11i may not be sufficient for public hot-spots: n Only VPN technologies (IPSEC, TLS, SSL) will fulfil end-to-end security requirements in public environments...

Page 63 - Summary: MAC Functionality; Independent and Infrastructure configuration support

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 63 © Siemens, 2002 Summary: MAC Functionality n Independent and Infrastructure configuration support – Each BSS has a unique 48 bit address– Each ESS has a variable length address n CSMA with collision avoidance – MAC-level ...

Page 64 - Part 8: Public hotspot operation; Becoming a WLAN operator is easy.

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 64 © Siemens, 2002 Part 8: Public hotspot operation n Serving customers in public hot spots... n One solution for every place (hotspot) n Becoming a WLAN operator is easy. n Selling WLAN access in public hot-spots: Probably ...

Page 66 - A web-browser will likely be available on all notebooks.

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 66 © Siemens, 2002 One solution for every place (hotspot) n There is a wide variety of notebooks each having more or less its unique configuration. n Only a very common dominator can be assumed for the software installations...

Page 67 - – Most commercial installations are much more expensive

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 67 © Siemens, 2002 Becoming a WLAN operator is easy. n Legal aspects (in Germany):– Usage of license free spectrum (2,4 GHz ISM band)– No telecommunication license necessary, as long as • not providing telephony services, • ...

Page 68 - How does your favorite storefront look like?; Too much security might hinder your business!

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 68 © Siemens, 2002 Selling WLAN access in public hot-spots:Probably to consider … n How does your favorite storefront look like? Too much security might hinder your business!

Page 70 - LQWHUQHW; auth

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 70 © Siemens, 2002 How does it work:Web based access control LQWHUQHW Password: Username: auth html RADIUS client auth '+&3 6HUYHU $$$ 6HUYHU $FFHVV *DWHZD\ 0RELOH &OLHQW ********** max.riegel

Page 74 - Part 9: WLAN – UMTS Interworking

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 74 © Siemens, 2002 Part 9: WLAN – UMTS Interworking n UMTS and Wireless LAN are different n WLAN – UMTS Interworking: Ancient approach: ‚tight coupling‘ n WLAN as an exension of a mobile network n WLAN is much cheaper than 2...

Page 75 - UMTS and Wireless LAN are different.

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 75 © Siemens, 2002 UMTS and Wireless LAN are different. GSM/GPRS/UMTS n anytime / everywhere n voice, realtime messaging n QoS n precious bandwidth n carrier grade n operator driven n huge customer base n high revenues WLAN ...

Page 76 - WLAN as just another radio access technology of UMTS

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 76 © Siemens, 2002 PSTN PLMN access PLMN core VLR HSS AUC SGSN SCPLNP IN GGSN TDM / ATM / IP MSCS MSCS BTS BSC BTS Node B Node B RNC internet wlan local access network WLAN – UMTS Interworking: Ancient approach: ‘tight coupl...

Page 77 - tight coupling; – agreement with siteowner; Dynamics of growth may differ.; – new standards necessary

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 77 © Siemens, 2002 tight coupling AP WLAN as an extension of a mobile network n WLAN just as another radio access technology n MNOs are the WLAN operators– OA&M – agreement with siteowner – very dense PLMN n Full competi...

Page 78 - WLAN is much cheaper than 2G/3G; ORJDULWKPLFVFDOH

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 78 © Siemens, 2002 WLAN is much cheaper than 2G/3G * based on current IP volume prices of 40 ¼*%\WH Time based pricing results in similar costs,e.g. MobileStar Pulsar pricing plan: $0,10/min *356 *60+6&6' : /$1 *356 *60 ...

Page 80 - Revenues without competing against aggressive WLAN operators.; Siemens contributed ‚loose coupling‘ to standardization.

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 80 © Siemens, 2002 PSTN PLMN access PLMN core VLR HSS AUC SGSN SCPLNP IN TDM / ATM / IP MSCS MSCS BTS BSC BTS Node B Node B RNC internet wlan local access network WLAN – UMTS Interworking: Now widely accepted: ‘loose couplin...

Page 81 - – SGSN or MSC functionality

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 81 © Siemens, 2002 HLR SGSN SIM loose coupling (SIM) HLR RADIUS loose coupling (RADIUS) WLAN loosely coupled to a Mobile Network n Each hotspot is SS7 endpoint– SIM cards required – SGSN or MSC functionality at access networ...

Page 83 - Standards for WLAN/UMTS interworking; Requirements of 3GPP system – WLAN interworking.; generation cellular; coupling’ principle established

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 83 © Siemens, 2002 Standards for WLAN/UMTS interworking n 3GPP – R5: SA1 Requirements of 3GPP system – WLAN interworking. – R6: SA2 Continuation with architectural considerations n ETSI BRANSubgroup on “Interworking between ...

Page 84 - The end; Thank you for your attention.

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 84 © Siemens, 2002 The end n Thank you for your attention. n Questions and comments? Maximilian Riegel ( [email protected] ) Literature: n The IEEE 802.11 Handbook – A Designer‘s CompanionBob O‘Hara, Al Patrick; IEEE press, ...