Group Calls and Multicast Operation for Public Safety and Public Protection

IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number:

IEEE C802.16gman-10/0014Date Submitted:

2010-05-05Source:

Sungcheol Chang, Sungkyung Kim, Hyun Lee, E-mail: {scchang,csyoon}@etri.re.krJungsoo Jung, Eunkyung Kim, Jaesun Cha, Chulsik YoonETRI

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

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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]

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.

Key Requirements

• 16m-based Broadband LMR– Non-exclusion of 16e

• Group Call support– Multicast operation– Link adaptation

• Security support– Group key management

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

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

16n MS16n BS

16n MS

AAA ServerGroup Call Server

16n MS16n BS

16n MS

Group Call Gateway

Other Networks

Command and Control Center

IP based Access Network

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

16n MS16n BS

16n MS

Group Call Support at 16n (Cont.)

Unicast Connection Multicast Connection

16n BS

Group BGroup A

Group Call Server

16n BS

Group BGroup A

Group Call Server

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

16n BS

MS1

MS2

MS3

MS4

Group A

Group B

Group C

Group D

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.

Group Key Management

16n BS

Group Key A Group Key B

Summary

• Key requirements– 16m-based Broadband LMR– Group Call support– Security support

• Enhancement of multicast connection for group calls– For radio resource efficiency

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