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,
Jungsoo Jung, Eunkyung Kim, Jaesun Cha, Chulsik Yoon
ETRI
E-mail: {scchang,csyoon}@etri.re.kr
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 IMTAdvanced 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
Group Call Server AAA Server
• For Public Safety
• For Disaster Relief
– Group Call Server
– Clients
IP based Access Network
Command and
Control Center
16n BS
16n MS
Group Call Gateway
16n MS
• 16n/16m/16e MSs
• PSTN/TETRA terminals
• Etc.
– Group Call Gateway
• Interworking
Other Networks
16n BS
16n MS
16n MS
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
16n BS
16n MS
• Only DL connection
16n MS
• Carrying a DL data to MSs at a time
• Efficient usage of radio resources, especially for transporting group
call traffic
Group Call Support at 16n (Cont.)
Unicast Connection
Multicast Connection
Group Call Server
Group Call Server
16n BS
Group A
16n BS
Group B
Group A
Group B
Link Adaptation
• A multicast connection for group users
– MCS level for a worst channel
16n BS
• No link adaptation
– A robust MCS level
MS1
• Link adaptation
– Optimized MCS levels
Group A
Group B
Group C
MS2
MS3
Group D
MS4
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, 201003-17
• [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