1. Always Best Connected Architecture and Design Rajesh Mishra Ericsson Berkeley Wireless Center

2. August 2002 Always Best Connected - ABC WLAN, LAN GPRS/UMTS cdma2000 DSL, Cable TV access operator ISP for a user, who wants to connect to a service, to be able to choose accesses and devices in a way that best suits his or her needs, and to change when something better becomes available PAN Bluetooth application service provider corporation ABC actors, involved in business relations

3. Ericsson Berkeley Wireless Center August 2002 ABC - Definition Framework that supports –Mobility Management (session continuity) –Access Discovery and selection –Authentication and security –Profile Server

4. Ericsson Berkeley Wireless Center August 2002 ABC solution components access discovery access selection AAA support mobility management content adaptation profile handling what accesses are currently available? connectivity to service? what access to choose; what is “best”? user/terminal/network-based solution one or multiple accesses in parallel session continuity, session transfer support for real-time services authentication, authorization, accounting accesses, services...  single logon applications adapting to access & device personal profiles for ABC access selection & content adaptation

5. Ericsson Berkeley Wireless Center August 2002 ABC functional architecture application server terminal (laptop/PDA) ABC service network profile server mobility server AAA server user profile: operator’s information about user personal preferences: for choice of access etc. network characteristics: bandwidth, cost, QoS, operator,... terminal capabilities: screen size, processing capacity,... access wizard: support for access selection link manager: access discovery access manager: access selection access wizard agent GUI mobility client application

6. Ericsson Berkeley Wireless Center August 2002 ABC component- Link Manager Link Manager Routing Table IF1 IF2IF3 admin probes admin Responder probes Access Manager

7. Ericsson Berkeley Wireless Center August 2002 ABC Component description- Link Manager –Every interface has a corresponding link manager –Its prime function is to supervise this interface –Various states are defined for this operation admin state: ifconfig up/down connect state: IP connectivity to the responder link state: radio link available, ethernet cable plugged in active state: If this is the primary interface –It takes down the interface if the IP connectivity to the Responder is lost, and brings it up and initializes with the new IP Address –Updates the routing table

8. Ericsson Berkeley Wireless Center August 2002 ABC component- Link Manager (operation) Start Check If connectivity Up Down Bring up the interface 1.Bring interface administratively down 2.Bring interface administratively up 3.Attach to the medium (ESSID) 4.Get IP address (use dhcp) 5.Install the route to the responder Bringing up the interface

9. Ericsson Berkeley Wireless Center August 2002 ABC component- Access Manager GUI Access Manager Link Manager Link Manager

10. Ericsson Berkeley Wireless Center August 2002 ABC component- Access Manager – Coordinates the function of link managers GUI Access Manager Link Manager 1. Activate Interface 2. Deactive the present interface 3. Remove the routing entries for the server and the default route 5. Update the routing table for the new selected interface 4. Activate the new interface Link Status 6. Signal the Mobility client for the interface change

11. Ericsson Berkeley Wireless Center August 2002 ABC component- GUI – Displays the link status and allows user selection

12. Ericsson Berkeley Wireless Center August 2002 ABC component- SLM – Mobility management is handled using Session Layer Mobility (SLM) – Maintaining TCP session for application –TCP multiplexing – Kernel modification of socket ‘connect’ call – Single TCP connection broken in 3 pieces as below: 1 Application SLM Client Proxy SLM Server Proxy Application Server Terminal Trunk 2 3

13. Ericsson Berkeley Wireless Center August 2002 ABC component- SLM Message traces between SLM client and SLM server SLM ClientSLM Server AAA establishAuth request Challenge + Responsechallenge response Trunk ID data

14. Ericsson Berkeley Wireless Center August 2002 “the b/w you have is...” application access wizard agent access wizard SLM server application server profile server (MIB) - device description - available accesses - preferences - current access - best access - device description - measurements - preferences - current access - preferences - statistics “please measure...” - preferences, statistics bandwidth/delay measurements SLM client ABC – Access Wizard and Profile server

15. Ericsson Berkeley Wireless Center August 2002 ABC – Future… Integrating the Profile and adaptation work Making the testbed more robust Enhancing the testbed??