Network-Centric Architecture for Context-Aware Information Delivery Services in 3G Mobile Networks

1. Network-Centric Architecture for Context-Aware Information Delivery Services in 3G Mobile Networks Eiji Kamioka1, Shigeki Yamada1 and Takako Sanda2 1National Institute of Informatics 2The Graduate University for Advanced Studies E-mail: 1{kamioka, shigeki}@nii.ac.jp, 2sanda@grad.nii.ac.jp

2. Introduction • Ubiquitous Computing • Ubiquity • Invisibility --- Context Awareness • Context-Aware Computing • Context-aware information delivery services • At Any time and anywhere • From LAN to WAN • From indoor to outdoor • From stationary to mobile environments • CAIDS: Context-Aware Information Delivery System

3. Context-Aware Service Scenarios Tour guide in Paris Personal communication service ----------- Context ----------- Location: on an airplane Activity status: sleeping Available device: headset I want to visit the Eiffel Tower!How can I get there?

4. Functional Requirements of Context-Aware Services • Context-Awareness • Captures and updates user’s context • The captured context is stored in a context database • Deals with frequent changes and reuse of the context. • Information Binding • Analyzes and interprets the context • Binds the context to the content • Information Provision • Converts the media content into one adapted to the receiver’s communication environment, if necessary. • Delivers the (converted) content to the receiver at the right time in the right way Context binding Content

5. System Architecture • Function Modules • UIN (Universal Information delivery Navigator) • DA (Directory Agent) • UMD (User Management Database) • MPS (Media Processing Server) authentication UMD Query of content discovery UIN context DA MT Location of content server Query of download MPS Content Server content Conversion if necessary MT: Mobile Terminal

6. Access Network for CAIDS UMTS Release 5 Architecture Integrated with WLAN WLAN Internet PSTN/ISDN ISP network MT AP R R WLAN MGCF MGW T-SGW UTRAN PS-CN S-CSCF MT BS RNC SGSN GGSN P-CSCF IMS I-CSCF HSS UMTS Release 5

7. Comparison between CAIDS and EAPEC EAPEC Communication Context Network Communication Receiver Communication Sender Analysis Adaptation Conversion Media Media CAIDS User Context Network CAIDSUser Content Server Analysis Adaptation Conversion Contents Contents

8. CAIDS Architecture with Access Network User information is managed by the UMD through GGSN LAN Internet R Content Server ISP network WLAN MT AP R R HSS MPS CAIDS (4,9) (11) UMD UIN DA [12] [5,10] UTRAN PS-CN IMS [13] (3) [6] (8) (1) MT BS RNC SGSN GGSN P-CSCF (2) [16] (7) [15] S-CSCF I-CSCF [14]

9. Information Flow in CAIDS MT P-CSCF I-CSCF S-CSCF UIN UMD DA Content Server REGISTER REGISTER (1) (2) SIP SIP (3) Authentication + Get S-CSCF (4) [5] [6] REGISTER (7) Based on the 3GPP specification SIP (8) Refer to UMD + Get location of content server (9) SLP [10] Response time (11) [12] SLP SIP SIP SIP [13] OK OK OK [16] [15] [14] HTTP GET HTTP OK (download)

10. Performance Model Parameters Values for Calculating and Simulating the Response Times

11. Performance Results and Analysis Response time under server processing time of 50ms and network delays of 10ms and 20ms Response time under server processing time of 10ms and network delays of 10ms and 20ms [ND]: Network Delay (ms) [PT]: processing time (ms)

12. Conclusion • CAIDS: Context-Aware Information Delivery System • Concept • System architecture • Disposition of function modules • Including personal communication services • Preliminary performance evaluation • Future work • Implementation of CAIDS prototype into test bed network