QoS and Radio Resource Management in 3G and Beyond Systems. Oriol Sallent Kideok Cho

Transcription

1 QoS and Radio Resource Management in 3G and Beyond Systems Oriol Sallent Kideok Cho

2 -2/30- Contents Radio Resource Management RRM in Beyond 3G Common RRM in a flexible spectrum scenario Conclusion

3 Radio Resource Management

4 -4/30- RRM in 3G network Is responsible for improving the utilization of the air interface resource Power Control Handoff Control Admission Control Load Control (Congestion Control)

5 -5/30- Typical locations of RRM functions Base Station Mobile Terminal Radio Network Controller Power Control Power Control Handoff Control Load Control Power Control Handoff Control Admission Control Load Control

6 -6/30- Power Control Overall objectives of power control Maximizing the battery life of mobile terminals Overcoming the near-far effect in the uplink Optimizing system capacity by controlling interference Compensating the inter-cell interference

7 -7/30- Handoff Control

8 -8/30- Admission Control (1/2) Cell Breathing based on the number of users Admission control Checks admitting the new connection will not sacrifice the planned coverage area or the QoS of existing connections Is Located in RNC where load information of several cells can be obtained

9 -9/30- Admission Control (2/2)

10 -10/30- Load Control To ensure that the system is not overloaded and remains stable When overload is encountered the LC returns the system quickly and controllably back to targeted load Possible load control actions Change the size of soft handover zone to accommodate more users Handover to overlapping network (another UMTS network or GSM network) Reduce the throughput of packet data traffic (non-real-time service) Drop calls in a controlled way

11 RRM in Beyond 3G

12 Beyond 3G Network Heterogeneous network concept Flexible and open architecture for a large variety of wireless access technologies, applications and services with different QoS demands, as well as different protocol stacks Radio access networks include cellular networks and also other public non-cellular access networks (e.g. WLAN) In these new scenarios, different Radio Access Technologies (RATs) will coexist and will operate in a coordinated way -12/30-

13 -13/30- Beyond 3G Network Billing SIP Proxy VHE Server Signalling WAP Accountin Gateway g IS P Satellite FES Broadcast Networks (DAB, DVB-T) IP backbone GSM / GPRS The Internet Context-aware information Centre UMTS IP-based micro-mobility Wireless LANs

14 -14/30- Beyond 3G Network Complementary characteristics of different RATs higher overall performance than the aggregated performances of the stand-alone networks Clearly, this potential gain can only turn into reality by means of a proper management of the available radio resources Common Radio Resource Management (CRRM) Set of functions devoted to ensure an efficient and coordinated use of the available radio resources in heterogeneous networks scenarios

15 -15/30- Beyond 3G Network

16 -16/30- Terminal in B3G

17 Two entities for RRM RRM entity carries out the management of the resources in one radio resource pool of a certain radio access network. CRRM entity is involved in the coordinated management of the resource pools under different RRM entities -17/30-

18 -18/30- Interaction between RRM and CRRM Information reporting function Dynamic measurements (e.g. the current load, the transmitted carrier power, etc.) Static information on cells (e.g. if they are overlapped or not, whether a cell supports GPRS, EDGE, etc.) RRM decision support function how the CRRM and RRM entities interact for taking decisions

19 -19/30- RRM in B3G Power Control Horizontal (intra-system) handoff Admission Control Load Control (Congestion Control) Initial RAT selection Vertical (inter-system) handoff

20 -20/30- Beyond 3G Network Billing SIP Proxy VHE Server Signalling WAP Accountin Gateway g IS P Satellite FES Broadcast Networks (DAB, DVB-T) IP backbone GSM / GPRS The Internet Context-aware information Centre UMTS IP-based micro-mobility Wireless LANs

21 -21/30- EVEREST project Aims Investigate and propose RRM and CRRM mechanisms and algorithms in a heterogeneous access network End-to-end QoS architecture: test the impact of the developed CRRM algorithms on the end-to-end session interactions between the CN QoS entities and the CRRM

22 -22/30- EVEREST E2E QoS Architecture Initial assumptions QoS framework in the IP CN: DiffServ e2e QoS proposal Bandwidth broker Wireless QoS broker: CRRM and Policy Decision Point Load balancing Policy-based QoS management

23 -23/30- EVEREST QoS Architecture

24 Service-based policy (1/2) VG (Voice GERAN) policy: Voice service is allocated to GERAN Interactive service is allocated to UTRAN VU (Voice UTRAN) policy: Voice service is allocated to UTRAN Interactive service is allocated to GERAN Aggregated throughput (Mb/s) -24/30-

25 -25/30- Service-based policy (2/2) Aggregated packet delay (s) VU more sensitive to cell range increase VU more sensitive to load increase (i.e. packet delay increases) It seems more suitable to map voice to GERAN and www to UTRAN

26 -26/30- Radio network-based policy Indoor traffic is allocated GERAN -> better utilization of the radio resources

27 -27/30- Multi-mode terminal capability UL Throughput degradation Increase of degradation with decrease of multi-mode availability Increase of degradation with increase of number of users

28 Common RRM in a flexible spectrum scenario

29 CRMM Fixed spectrum assignments lead to inefficient spectrum utilization New regulation regarding spectrum management is needed -> Cognitive Radio!!! -29/30-

30 -30/30- Conclusion The heterogeneous network concept Beyond 3G Network Common Radio Resource Management B-3G opens a new dimension in the RRM problem