Dynamic Resource Scheduling Algorithm for Public Safety Network

1. Dynamic Resource Scheduling Algorithm for Public Safety Network Hyunwoo Kim

2. Ⅰ. Introduction(1) LTE Based Public Safety Network Multimedia(Voice, Video, Data...) Airports Military Cities Schools Hospitals Utilities Citizens & Civil defense • Citizen Alerts • Database Query • Video Intelligence • Multimedia Groups • Predictive Analytics • Evidence • Gathering • Crime Prevention Emergency Fire Police Public Protection + Disaster Relief Environment Change Characteristics of Disasters Global warming Large industrial complex Dense living space Unexpected Larger Complicate, Various

3. Ⅰ. Introduction(2) Same technology, Rapid response for disaster

4. Ⅰ. Introduction(3) Push To Talk LTE Group, Private Call Mission Critical

5. Ⅰ. Introduction(4) • MCPTT Call Type • Private Call, Group Call, Emergency Call cased by On/Off network

6. Ⅱ. MCPTT Priority Model(1) MCPTT Priority Model (3GPP TS 22.179) - Dynamic MCPTT priority control

7. Ⅱ. MCPTT Priority Model(2) MCPTT Priority Model (3GPP TS 22.179) - Dynamic MCPTT priority control & MC Service user profile LTE Policy Inofratmion EPC Scheduling Control MCPTT Policy& QoS Control MCPTT Policy Information Coordination [MCPTT EPC Resource Control] [MC Service User Profile]

8. Ⅲ. MCPTT QoS Control • MCPTT QoS Control • Standardized QCI, QoS parameter thresholds and example service(according to 3GPP)

9. Ⅲ. Mobile traffic Jam • LTE mobile traffic jam by Disaster • Mobile traffic is quickly higher over than radio resource capacity because of multiple user. • Network quality is worse, so we need to protect MCPTT user. Traffic Resource Capacity Mobile Traffic [MCPTT EPC Resource Control] Time Base Station

10. Ⅳ. Dynamic MCPTT resource control(1) • MCPTT user request to change priority MCPTT user gets priority MCPTT user request to change priority Command center checks possibility Rx PCRF SIP Core Gx MCPTT AS S1-U SGW PGW SGi S11 UE eNB MME Uu S1-MME S6 HSS HSS MCPTT Server UE eNodeB MME MCPTT Priority Change Request Check Possibility change priority MCPTT Priority Change Request MCPTT Priority Change Request Change User Profile (Resource Priority) MCPTT Priority Change Answer MCPTT Priority Change Answer MCPTT Priority Change Answer [Network Diagram] [MCPTT Priority Change Procedure]

11. Ⅳ. Dynamic MCPTT resource control(2) • Command center request to change user priority MCPTT user get priority Command center requests to change user priority Rx PCRF SIP Core Gx MCPTT AS S1-U SGW PGW SGi S11 UE eNB MME Uu S1-MME S6 HSS Command center request to change user priority HSS MCPTT Server UE eNodeB MME Change User Profile (Resource Priority) MCPTT Priority Change Answer [Network Diagram] MCPTT Priority Change Answer MCPTT Priority Change Answer [MCPTT Priority Change Procedure]

12. Ⅳ. Dynamic MCPTT resource control(3) • Network operator select resource allocation method by MCPTT Priority • We purpose MCPTT resource scheduling algorithms. Start Request to change user priority Command center checks possibility No Yes Change user priority & Radio resource allocation End MCPTT resource scheduling algorithms formula

13. Ⅴ. Field test and performance evaluation • System Parameter • We use LTE System parameter following table and diagram. • We tested in Traffic jam. case 1 . Normal radio resource allocation case 2. MCPTT resource scheduling algorithms Rx PCRF SIP Core Gx MCPTT AS S1-U SGW PGW SGi S11 UE eNB MME Uu S1-MME S6 HSS MCPTT IMS EPC System Diagram System Parameter

14. UE Download Throughput (Case 1 vs Case 2) Ⅴ. Field test and performance evaluation

15. UE Upload Throughput (Case 1 vs Case 2) Ⅴ. Field test and performance evaluation

16. Ⅵ. Conclusion • In MCPTT, there is traffic jam that causes excessive traffic due to disaster. • the MCPTT user who needs to recover from the disaster can’t communicate • dynamic resource scheduling algorithm is to resolve the problem • Case 1 : changes the user priority dynamically by directly requesting the user • Case 2 : changes the user authority on the command center. . • We tested ideal and field environment • Network quality is guaranteed. • (future work) It needed to determine the disaster situation and automatically grant authority.