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

2. Multimedia(Voice, Video, Data...) Public Protection + Disaster Relief
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
Fire
Emergency
Police
Public Protection + Disaster Relief
Mobile data traffic expects to increase 1000 fold from 2010 to 2020
Lte-advanced shall support wider bandwidth like 100MHz, LTE shall support 20MHz, so frequency resource is lack.
Also, multiple operator and various services use LTE technologies.
For example, volte / data/ enterprise for company / public safety for government/ railway and maritime
Multiple lte networks has co-located area and intra-operator interference.
LTE networks use same frequency has converge overlap.
Intra-operator interference is inevitable in area where communication coverage overlap.
Network quality degradation occurs problem in LTE network
We recommend to apply network sharing technology
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. LTE Push To Talk Mission Critical Group, Private Call
Ⅰ. Introduction(3)
LTE
Push To
Talk
Mobile data traffic expects to increase 1000 fold from 2010 to 2020
Lte-advanced shall support wider bandwidth like 100MHz, LTE shall support 20MHz, so frequency resource is lack.
Also, multiple operator and various services use LTE technologies.
For example, volte / data/ enterprise for company / public safety for government/ railway and maritime
Multiple lte networks has co-located area and intra-operator interference.
LTE networks use same frequency has converge overlap.
Intra-operator interference is inevitable in area where communication coverage overlap.
Network quality degradation occurs problem in LTE network
We recommend to apply network sharing technology
Mission
Critical
Group,
Private
Call

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 )
- Dynamic MCPTT priority control

7. Ⅱ. MCPTT Priority Model(2)
MCPTT Priority Model (3GPP TS )
- Dynamic MCPTT priority control & MC Service user profile
MCPTT
Policy
Information
MCPTT
Policy& QoS
Control
LTE
Policy
Inofratmion
EPC
Scheduling
Control
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)
QCI
Resource Type
Priority Level
Packet Delay Budget
Packet Error Loss
Service 1
GBR 2
100ms
10-2
Conversational Voice 4
150ms
10-3
Conversational Video (Live Streaming) 3
50ms
Real Time Gaming 5
300ms
10-6
Non-Conversational Video (Buffered Streaming) 65
0.7
75ms
Mission Critical user plane Push To Talk voice 66
Non-Mission-Critical user plane Push To Talk voice
Non-GBR
IMS Signalling 6
Video (Buffered Streaming)
TCP-based 7
Voice,Video (Live Streaming)
Interactive Gaming 8 9 69
0.5
60ms
Mission Critical delay sensitive signalling 70
5.5
200ms
Mission Critical Data

9. [MCPTT EPC Resource Control]
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.
Base Station
Time
Traffic
Mobile Traffic
Resource Capacity
[MCPTT EPC Resource Control]

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

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

12. MCPTT resource scheduling algorithms
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. Reference signal power
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
User
Priority
MCPTT Super user
High
MCPTT user
Mid
Non- MCPTT user
Low
Parameter
Value
Channel Bandwidth
10MHz
Carrier Frequency
700 MHz(Band 28)
Transmit Power
40W(46 dBm)
Reference signal power
21 dBm
Antenna gain
15 dBi
Antenna Height
500M
MIMO
2 ｘ2 MIMO
UE count 3 UE
eNB
MME
SGW
PGW
SIP
Core
MCPTT AS
HSS
PCRF Uu
S1-MME
S1-U
SGi Gx
S11 S6 Rx
MCPTT
IMS
EPC
System Diagram
System Parameter

14. Ⅴ. Field test and performance evaluation
UE Download Throughput (Case 1 vs Case 2)
user
Original method
(Mbps)
proposed method
MCPTT super user
10.82
18.95
MCPTT normal user
10.79
8.95
non MCPTT user
10.69
4.52

15. Ⅴ. Field test and performance evaluation
UE Upload Throughput (Case 1 vs Case 2)
user
Original method
(Mbps)
proposed method
MCPTT super user
7.51
11.58
MCPTT normal user
7.45
6.34
non MCPTT user
7.07
3.27

16. dynamic resource scheduling algorithm is to resolve the problem
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.