1. Apartado 4433 4007-001 Porto Codexwww.inescporto.pt tel (351)22 209 4000fax (351)22 208 4172 8/April/2005 Research Activities in 4G Networks at INESC Porto Manuel Ricardo and José Ruela

2. 8/Apr/05 2 Communication Networks and Services Group People –2 professors –2 senior researchers –6 PhD students –6 MSc students –Variable number of Licenciatura students Located at –INESC Porto –“Campus da FEUP” – Faculdade de Engenharia da Univ. do Porto

3. 8/Apr/05 3 Research in Mobile Communications – Context Mobile communications networks vs fixed networks – mobility of the terminals – properties of wireless links variable bit rates, variable bit error ratios –terminal characteristics low processing capabilities, low memory, low consumption 2 key research areas in Networking –4G networks –Ambient networks

4. 8/Apr/05 4 Research in Mobile Communications – 4G Networks 4G mobile terminal –Always Best Connected to the available networks –Multiple network interfaces, of different radio technologies –Information conveyed as IP packets Research problems include –Mobility support, routing –QoS, radio resource management, traffic accounting –Security –Ad-hoc, mobile networks –Improvement of existing PLMNs (e.g. GPRS, UMTS)  VoIP, multicast –Planning, management, and operation In Europe  focused on IPv6

5. 8/Apr/05 5 Research in Mobile Communications – Ambient Networks Ambient intelligence –People immersed in reacting environments –Persons carry small devices  may form a PAN –Devices communicate over radio links; connections with neighbour networks Research problems include –Plug-and-play of unknown devices and networks –Network composition –Mobility, security –Multihoming

6. 8/Apr/05 6 Topics under Research at INESC Porto Ad-hoc networking Generic link layer QoS, congestion control Testing Multicast

7. 8/Apr/05 7 Integrating Ad-hoc with Infrastructure Networks Ad-hoc used to extend the coverage of infrastrucure networks Current solution implements –gateway discovery, address autoconfiguration, MIPv6, AODV + OLSR Under work –terminal handover between ad-hoc and infrastructure modes –Multipath towards the infrastructure Ad-hoc used to extend the coverage of infrastrucure networks Current solution implements –gateway discovery, address autoconfiguration, MIPv6, AODV + OLSR Under work –terminal handover between ad-hoc and infrastructure modes –Multipath towards the infrastructure

8. 8/Apr/05 8 Automatic Networking Plug-and-play of computers and networks Development of new signaling, which –Detects/establishes links –Detects other (ambient) networks / devices –Forms networks using existing technologies IPv4, NAT, DHCP, IPv6, MIPv6, HIP, tunnels, IPSec, PPox, PPTP –Exchanges information about routing, security, and QoS –Addresses also multi-homing, multicast and mobility

9. 8/Apr/05 9 Service Announcement over Ambient Networks

10. 8/Apr/05 10 Generic Link Layer for Heterogeneous Networks – QoS QoS reservation in heterogeneous wireless networks –QoS-enabled virtual channels between MN and AR –Technology-independent interface for 802.15.1, 802.11, 802.16, UMTS Support for handover and multicast

11. 8/Apr/05 11 Generic Link Layer – RoHC, Robust Header Compression VoIP, mobile VideoIP - very small IP packets IP/UDP/RTP headers  significant overheads RoHC solution –Adapts the IETF RoHC to heteregenous networks –Compatible with QoS Generic Link layer

12. 8/Apr/05 12 Generic Link Layer – RoHC, Robust Header Compression

13. 8/Apr/05 13 End-to-End Quality of Service Framework – ScalServ Evolved from IntServ over DiffServ Provides end-to-end QoS to real time flows 3 service classes, with universal semantics –Less than Best Effort, Best Effort, Assured Delivery (AD) AD service class –Possible microflow aggregation –Uses end-to-end signalling –Interpreted at selected nodes in the access networks

14. 8/Apr/05 14 Congestion Control Assumption – (some) networks do not provide QoS mechanisms –but need to transport real time flows Development of new congestion control mechanisms –preserve the network stability –are media friendly –can be combined with L4 (end-to-end) mobility solutions

15. 8/Apr/05 15 Passive Testing – Monitoring Mobile Flows Detection of mobile flows and representing them for –Operator: traffic maps –User: received QoS under wireless and mobile conditions Sampling Detection of mobile flows and representing them for –Operator: traffic maps –User: received QoS under wireless and mobile conditions Sampling

16. 8/Apr/05 16 Passive Testing – Monitoring Mobile Flows

17. 8/Apr/05 17 Testing – Monitoring Platform for a 4G Operator Passive Measurements –Traffic accounting –Detection SLA violations –User Location Active Measurements –Bandwidth probing Passive Measurements –Traffic accounting –Detection SLA violations –User Location Active Measurements –Bandwidth probing

18. 8/Apr/05 18 Testing – Protocol Conformance Protocol / system functional testing Automatic generation of tests from specifications Tests and results obtained on-the-fly I Tester C E S

19. 8/Apr/05 19 Multicast Addressed as an horizontal issue –As a rule, every new work/ thesis addresses multicast –Particular attention to video broadcast Definition of a secure IP multicast solution –Transmission of multiple video channels –Each channel viewed only by authorized users –If a channel is not visualized, it is not transmitted

20. 8/Apr/05 20 Testbed 1 – Infrastrucure and Ad-hoc

21. 8/Apr/05 21 Testbed 2 – QoS Service request QoS Request Path Reserve Data Admission control + L2 link capacity renegotiated Admission control + L2 link capacity renegotiated Admission control + L2 link capacity renegotiated Admission control + L2 link capacity renegotiated Admission control + LSP capacity renegotiated Admission control + LSP capacity renegotiated QoS Reserved

22. 8/Apr/05 22 Conclusions Research in mobile communications networks at INESC Porto –Ad-hoc networking, Generic link layer, QoS, Testing, Multicast Area appealing and rewarding for research and business Group active at national and international level Other national research groups have similar growth We feel that, in Portugal, we are starting to reach the critical mass required to enable mobile communications to emerge as a relevant industry