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Magazine 文章心得

Magazine 文章心得. 學號： 643430007 姓名：蘇彥文. Abstract. A new method to support UMTS WLAN vertical handover using SCTP Interworking techniques and architectures for WLAN 3G integration toward 4G mobile data networks IEEE802.11 roaming and authentication in wireless LAN cellular mobile networks 心得.

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Magazine 文章心得

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  1. Magazine文章心得 學號：643430007 姓名：蘇彥文

  2. Abstract • A new method to support UMTS WLAN vertical handover using SCTP • Interworking techniques and architectures for WLAN 3G integration toward 4G mobile data networks • IEEE802.11 roaming and authentication in wireless LAN cellular mobile networks • 心得

  3. Magazine 1 • A new method to support UMTS WLAN vertical handover using SCTP

  4. Note Abstract • UMTS networks and WLANs • Third-generation cellular networks • UMTS/WLAN vertical handover problem • Overview of Mobile SCTP • VERTICAL HANDOVER PROCEDURES

  5. UMTS networks and WLANs • UMTS • wide-area connectivity • low data rate • high mobility • WLANs • higher data rate • low mobility

  6. Third-generation cellular networks • Both UMTS and WLANs • WLAN offer higher bandwidth • Mobile users accessing the Internet via UMTS/WLAN are free to move • Handover between UMTS and WLANs • MIP from IETF • provides transparent support for host mobility • routing architecture of mobile host • Difficult to maintain the continuity between UMTS and WLAN • Point of this article

  7. UMTS/WLAN vertical handover problem • UMTS/WLAN verti­cal handover support via two types of SCTP • single-homing asymmetric config­uration • dual-homing symmetric configu­ration • Inte­grated UMTS/WLAN network architecture • tightly coupled solutions ：connect UMTS and WLAN • loose coupling solutions ：separate out UMTS and WLAN • loose coupling offers several advantages over tight coupling

  8. Overview of Mobile SCTP (1) • Originally for VoIP of 3GPP • Reliability • Multi-homing • established over multiple interfaces identified by multiple IP addresses • An SCTP association between two hosts, say, A and B, is defined as • {[a set of IP addresses at A] + [Port-A]} + {[a set of IP addresses at B] + [Port-B]}.

  9. Overview of Mobile SCTP (2) • base version of SCTP cannot be used directly to support UMTS/ WLAN vertical handover • Fortunately, the recently proposed DAR extension for SCTP enables the endpoints to add, delete, or change the IP addresses during an active SCTP association using address configuration (ASCONF) messages. • basis of mSCTP

  10. Overview of Mobile SCTP (3) • mSCTP • Using for supporting UMTS/WLAN vertical handover • capabilities to add, delete, and change the IP addresses dynamically during an active SCTP association

  11. Overview of Mobile SCTP (4) • mSCTP Protocol architecture

  12. VERTICAL HANDOVER PROCEDURES (1) • FS can also be configured for: • Single-homing: The FS provides only one IP address to support handover. • Dual-homing: The FS allows more than one (usually two) IP addresses to support • Handover procedure has three basic steps: • Add IP address • Vertical handover triggering • Delete IP address

  13. VERTICAL HANDOVER PROCEDURES (2) • single-homing configuration

  14. VERTICAL HANDOVER PROCEDURES (3) • dual-homing configuration

  15. SIMULATION RESULTS AND DISCUSSIONS (1) • use network simulator ns-2 to perform the simulations and obtain • set to be 384 kb/s for the UMTS link and 2 Mb/s for the WLAN link • delay is set to 100 ms • FTP traffic is started at the MC at time 1 s • handover triggering process is acti­vated at time 5 s

  16. SIMULATION RESULTS AND DISCUSSIONS (2) • simulation results • UMTS-to-WLAN handover delay is 533 ms

  17. SIMULATION RESULTS AND DISCUSSIONS (3) • simulation results • WLAN-to-UMTS delay is 513 ms

  18. SIMULATION RESULTS AND DISCUSSIONS (4) • throughput performance for vertical handover in both directions

  19. Magazine 2 • Interworking techniques and architectures for WLAN 3G integration toward 4G mobile data networks

  20. Note Abstract • WLAN/3G inter­working function • INTERWORKING MODEL AND REQUIREMENTS • NETWORK SELECTION • INTERWORKING SCENARIOS • 3G-Based Access Control and Charging • REFERENCE POINTS • Access to 3G Packet-Switched Services • REFERENCE POINTS • CONCLUSIONS

  21. WLAN/3G inter­working function • WLAN/3G inter­working techniques and architectures can support • Authentication • Authorization • Accounting • WLAN sharing • Consis­tent service provisioning

  22. INTERWORKING MODEL AND REQUIREMENTS (1) • high-level WLAN/3G interworking model.

  23. INTERWORKING MODEL AND REQUIREMENTS (2) • WLAN/3G interworking must • provide 3G-based authentication • support 802.1X access control • support the legacy UAM and open access control schemes

  24. NETWORK SELECTION • MS needs to perform the following selection proce­dures • Select a WLAN that supports interworking with 3G PLMNs • MS must select one of the PLMNs • several solutions of network selection problem • broadcast an SSID with a suitable format • transmitting a probe request including a predefined well-known (3G-specific) SSID

  25. INTERWORKING SCENARIOS (1) • Scenario 1 — Common Billing and Customer Care • Scenario 2 — 3G-Based Access Control and Charging • Scenario 3 — Access to 3G Packet-Switched Services • Scenario 4 — Access to 3G Packet-Switched-Based Ser­vices with Service Continuity • Scenario 5 — Access to 3G Packet-Switched-Based Ser­vices with Seamless Service Continuity • Scenario 6 — Access to 3G Circuit-Switched-Based Ser­vices with Seamless Mobility

  26. INTERWORKING SCENARIOS (1)

  27. 3G-Based Access Control and Charging (1) • INTERWORKING ARCHITECTURE

  28. 3G-Based Access Control and Charging (2) • AAA SIGNALING

  29. 3G-Based Access Control and Charging (3) • AAA SIGNALING • MS sends its identity to the WLAN within an EAP-Response/Identity mes­sage • MS’s identity is NAI-1 • username@realm • WLAN discovers route AAA messages to the 3G PLMN corresponding to this realm • AAA access request is sent to the identified 3G PLMN over the Wr interface • WLAN sends network advertisement data to the MS • use a new EAP method called 3G-Info • XML structure

  30. REFERENCE POINTS (1) • 3G internal interfaces • Wr/Wb • carries AAA signaling between the WLAN and the 3G / home PLMN in a secure manner • Support Radius by acrossWr/Wb • Ws/Wc • provides the same functionality as Wr/Wb but runs between a 3G AAA proxy and a 3G AAA server

  31. REFERENCE POINTS (2) • Wf • transport charging information toward the 3G operator’s CGw/CCF located in the visited or home PLMN • Wo • used by the 3G AAA server to communicate with the 3G OCS

  32. REFERENCE POINTS (3) • Wx • between the 3G AAA server and the HSS • used primarily for accessing the WLAN subscription profiles of the users • D/Gr • used for exchanging subscription information between the 3G AAA server and the HLR by means of the MAP protocol

  33. Access to 3G Packet-Switched Services (1) • INTERWORKING ARCHITECTURE

  34. Access to 3G Packet-Switched Services (2) • AAA SIGNALING

  35. Access to 3G Packet-Switched Services (3) • AAA SIGNALING

  36. Access to 3G Packet-Switched Services (4)

  37. REFERENCE POINTS (1) • several additional interfaces • Wn • used for transporting tunneled user data between the WLAN and the WAG • Wm • located between the 3G AAA serv­er and PDG • used to enable the 3G AAA server to retrieve tunneling attributes and an MS’s IP configuration parameters from/via the PDG

  38. REFERENCE POINTS (2) • Wi • provided via the Wi interface based on IP • Wg • used by the 3G AAA proxy to deliver routing policy enforce­ment information to the WAG • Wp • transports tunneled user data traffic between the WAG and the PDG

  39. CONCLUSIONS • maintain access to the same 3G packet-switched services across several radio access technologies • such as IEEE 802.11, HiperLan/2, UTRAN, and GERAN • Ses­sion mobility is an additional requirement that needs further consideration and presents consid­erable technical challenges

  40. Magazine 3 • IEEE802.11 roaming and authentication in wireless LAN cellular mobile networks

  41. Note Abstract • Integrate wireless LAN service • IEEE 802.11 WIRELESS LAN ROAMING • RADIUS PROXY • IEEE 802.11 HORIZONTAL ROAMING • MOBILE IP HANDOFF PERFORMANCE IMPROVEMENT • WIRELESS TRANSMISSION PRIVACY • SECURITY ANALYSIS • AUTHENTICATION AND KEY NEGOTIATION DEMONSTRATION • SUMMARY

  42. Integrate wireless LAN service (1)

  43. Integrate wireless LAN service (2) • IEEE802.11 service integration functionality • integrate into cellular networks • Wireless network security • Service quality • refers to handoff speed and packet loss rate

  44. Integrate wireless LAN service (3)

  45. IEEE 802.11 WIRELESS LAN ROAMING (1) • IEEE802.11 roaming structure is based on • AAA broker with a Remote Authentication Dial-In User Service (RADIUS) server proxy • CA servers • are special servers that issue and verify certificates to fixed nodes or net­works upon request so that they have proofs to identify themselves • are organized in a tree topology and working in a distributed way

  46. IEEE 802.11 WIRELESS LAN ROAMING (2)

  47. RADIUS PROXY • RADIUS server retrieves • remote server’s domain from the user’s request • includes the network access identifier • identifier@domain_name

  48. IEEE 802.11 HORIZONTAL ROAMING (1) • Each network domain is interconnected by AAABs • In order to provide IP mobility • for­eign agent (FA) is placed into the NAS • The architecture is able to process two hor­izontal roaming scenarios • The current IEEE802.11 device connects to the network via the NAS • Seamless roaming

  49. IEEE 802.11 HORIZONTAL ROAMING (2)

  50. IEEE 802.11 HORIZONTAL ROAMING (3)

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