1. Group Calls and Multicast Operation for Public Safety and Public Protection IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE C802.16gman-10/0014 Date Submitted: 2010-05-05 Source: Sungcheol Chang, Sungkyung Kim, Hyun Lee, E-mail: {scchang,csyoon}@etri.re.kr Jungsoo Jung, Eunkyung Kim, Jaesun Cha, Chulsik Yoon ETRI Venue: IEEE 802.16 Session #67 Bangalore, India Base Contribution: None Purpose: To assist the 802.16 GRIDMAN SG to define system requirements for 802.16n standard Notice: This document does not represent the agreed views of the IEEE 802.16 Working Group or any of its subgroups. It represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.16. Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and.http://standards.ieee.org/guides/bylaws/sect6-7.html#6http://standards.ieee.org/guides/opman/sect6.html#6.3 Further information is located at and.http://standards.ieee.org/board/pat/pat-material.htmlhttp://standards.ieee.org/board/pat

2. Introduction Land Mobile Radio application is one of 16n applications [1] –A mission-critical communication for coordination of people and material, safety, security and emergency responses. –It used by a wide range of users such as companies, public safety organizations, public transportation and utilities industry. Broadband LMR is a broadband solution to meets LMR specific requirements.[2]

3. Motivation 16m is a good basis to build a Broadband LMR[5] –16m meets the cellular layer requirements of IMT- Advanced next generation mobile networks –16m supports public safety Call-prioritization, pre-emption, and push-to-talk Emergency Services Group Call is a key feature for Broadband LMR –Essential for Command and Control system. –Push-to-Talk service is a main application.

4. Key Requirements 16m-based Broadband LMR –Non-exclusion of 16e Group Call support –Multicast operation –Link adaptation Security support –Group key management

5. Broadband Capability of 16m 16m System Requirements[5] –To meet IMT-Advanced requirements. Supporting services required for next generation mobile networks –Broadband features Scalable bandwidth from 5 to 40MHz. Enhanced performance relative to the Reference System. –Support for government mandates and public safety –Reduced latency relative to the Reference System User-plane and Control-plane latencies; Handover interrupption time –Support of VoIP –Enhanced power saving

6. An Example of Network An Network for Group Call –Command and Control Center For Public Safety For Disaster Relief –Group Call Server –Clients 16n/16m/16e MSs PSTN/TETRA terminals Etc. –Group Call Gateway Interworking

7. Group Call Support at 16n Multiple connections from server to clients An access between a BS and MSs –Point-to-MultiPoint (PMP) access –Unicast transport connection Typically for a MS –Multicast/Broadcast connection Only DL connection Carrying a DL data to MSs at a time Efficient usage of radio resources, especially for transporting group call traffic

8. Group Call Support at 16n (Cont.) Unicast ConnectionMulticast Connection

9. Link Adaptation A multicast connection for group users –MCS level for a worst channel No link adaptation –A robust MCS level Link adaptation –Optimized MCS levels

10. Group Key Management Key management on unicast connection –Per user signaling procedure Group Key management –Updating a group key is done at a time for all the group users. –16e supports its procedure, but 16m doesn’t support it because E-MBS traffic is encrypted in upper layer, not MAC layer. –Group calls require group key management for encrypting multicast traffic It reduces signaling overhead when BS updates a group key.

11. Group Key Management

12. Summary Key requirements –16m-based Broadband LMR –Group Call support –Security support Enhancement of multicast connection for group calls –For radio resource efficiency

13. References [1] IEEE 802.16gman-10/0019r1: NRR Draft Report, 2010- 03-17 [2] IEEE C802.16nrr-08/002: Land Mobile Radio evolution to Broadband, 2008-12-03 [3] IEEE C802.16nrr-09/001: Public Safety Bands in the US Under 1 GHz (Informational), 2009-01-12 [4] IEEE C802.16nrr-09/003: Public Safety usage model, 2009-01-13 [5] IEEE C802.17m-07/002r10: 802.16m System Requirements Documents, 2010-01-14