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July 2003
Jean-Michel Lauriol, Alcatel
Slide 1
doc.: IEEE 802.11-03/462r0
IEEE 802.11 / San Francisco / 20-25 July 2003
TIA TR-41 VoIP over WLAN projects
Jean-Michel Lauriol, AlcatelFrançois Pinier, Alcatel
July 2003
Jean-Michel Lauriol, Alcatel
Slide 2
doc.: IEEE 802.11-03/462r0
IEEE 802.11 / San Francisco / 20-25 July 2003
TIA TR-41
• TR-41 : User Premises Telecommunications Requirements
• Addresses standards for telecommunications terminal equipment and systems, specifically those used for voice service, integrated voice and data service, and Internet Protocol (IP) applications.
• Overview of TIA TR-41 activities in May 03 : 11-03-296r1
July 2003
Jean-Michel Lauriol, Alcatel
Slide 3
doc.: IEEE 802.11-03/462r0
IEEE 802.11 / San Francisco / 20-25 July 2003
TR-41 VoIP over WLAN Projects
• Why ?– Need for VoWLAN handset interoperability
• Based on IEEE 802.11 standards, Wi-Fi Alliance deals with only layers 1 and 2
• TIA is the right standardisation body to address end-to-end interoperability
– TIA already specified wired terminals (IP phone, …) interoperability requirements (TIA/IS-811)
• VoWLAN projects launched in Q1 2003 inside TR-41– see Press Release : http://pulse.tiaonline.org/article.cfm?id=1047
July 2003
Jean-Michel Lauriol, Alcatel
Slide 4
doc.: IEEE 802.11-03/462r0
IEEE 802.11 / San Francisco / 20-25 July 2003
Scope of TR-41 VoIP over WLAN Projects - 1
• Mission :– requirements for enabling VoIP telephony
communications via WLAN in a corporate environment
• Goals :– not duplicate efforts– reference existing and drafts standards (IEEE
802.11, WFA, IETF, ...), if necessary develop new specifications.
July 2003
Jean-Michel Lauriol, Alcatel
Slide 5
doc.: IEEE 802.11-03/462r0
IEEE 802.11 / San Francisco / 20-25 July 2003
Scope of TR-41 VoIP over WLAN Projects - 2
• Define interoperability requirements:
– needed WLAN architecture for voice applications
– « VoWLAN handset profile » concept
– Telephonometry
– location for Emergency Calling service
New doc
TIA 1003
New doc
TIA 1002
TBD
Update doc
TSB 146
July 2003
Jean-Michel Lauriol, Alcatel
Slide 6
doc.: IEEE 802.11-03/462r0
IEEE 802.11 / San Francisco / 20-25 July 2003
Scope of future TIA 1002 document -1
• Project : PN-3-0102, “Requirements for a Wireless LAN Based IP Telephony Subsystem”
• TIA interoperability requirements shall be compliant with WFA & IEEE 802.11specifications
• Voice requirements need enhanced 802.11 specifications (11e, 11i, …) :– Living document
• Define interactions between WLAN and upper layers (e.g.. global MSC)
July 2003
Jean-Michel Lauriol, Alcatel
Slide 7
doc.: IEEE 802.11-03/462r0
IEEE 802.11 / San Francisco / 20-25 July 2003
Scope of future TIA 1002 document -2
• Reference model
WT AP
AP
IP Corporate network
Call server
MA
AS
WT : Wireless Telephone AP : Access Point AS : WLAN authentication server MA : Mobility Agents MG : Media Gateway PSTN : Public Switched Telephone Network TDM : Time Division Multiplexing
MG
PSTN Private legacy TDM network
July 2003
Jean-Michel Lauriol, Alcatel
Slide 8
doc.: IEEE 802.11-03/462r0
IEEE 802.11 / San Francisco / 20-25 July 2003
Scope of future TIA 1002 document -3
• Main High level requirements :– 802.11 Infra-structure mode– IP Core network based on IPV4– Support Power Save mode as defined in 802.11– Support of multiple Voice VLANs per AP– Level of QoS for a moving WT shall not be
significantly decreased due to layer 2 handovers, IP roaming and re-authentication process
– Possible to perform authentication process through WLAN smart card inside WT
– Possible to assign IP address dynamically
July 2003
Jean-Michel Lauriol, Alcatel
Slide 9
doc.: IEEE 802.11-03/462r0
IEEE 802.11 / San Francisco / 20-25 July 2003
Scope of future TIA 1002 document -4
• Mobility – L2 and L3 handovers
• L3 handover is a key issue– VLAN (dedicated voice VLAN ids)
• Security is defined at several levels– define suitable authentication method above EAP for
seamless mobility– Investigate end-to-end security based on standard
telephony protocol (e.g. H.235, …)• QoS
– Mandatory features to support voice
July 2003
Jean-Michel Lauriol, Alcatel
Slide 10
doc.: IEEE 802.11-03/462r0
IEEE 802.11 / San Francisco / 20-25 July 2003
Scope of future TIA 1003 document
• Project : PN-3-0103, “Requirements for a Wireless LAN Based IP Telephony Endpoint”
• Will be patterned after TIA/IS-811 but will cover products with a WLAN interface instead of an Ethernet Interface
• In addition to WLAN support, it will address requirements for :
• Display and keypad• Acoustic performances : Pointer to new telephonometry document• Network and security requirements• Power management• Telephony features description• Control protocol requirements (SIP, H.323 and Megaco)
July 2003
Jean-Michel Lauriol, Alcatel
Slide 11
doc.: IEEE 802.11-03/462r0
IEEE 802.11 / San Francisco / 20-25 July 2003
Telephonometry - 1
• Current Status : Transmission requirements of wireline VoIP phone sets are defined in ANSI/TIA/EIA/-810-A specification approved December 19, 2000.
• This specification does not address wireless VoIP phone sets !
• Aim of the new project : Develop a specific standard for wireless VoIP handsets.
July 2003
Jean-Michel Lauriol, Alcatel
Slide 12
doc.: IEEE 802.11-03/462r0
IEEE 802.11 / San Francisco / 20-25 July 2003
Telephonometry - 2
• Why ?Due to small shape, wireless handset does not
have same electro-acoustic features as corded phone set (e.g. Low intrinsic TCLw).
Wireless handset shall operate in noisy environment (e.g. corridor, meeting room, manufacturing space).
• Work still in progress within TR-41 for handling this new topic : Should be discussed during the next TR-41 session.
July 2003
Jean-Michel Lauriol, Alcatel
Slide 13
doc.: IEEE 802.11-03/462r0
IEEE 802.11 / San Francisco / 20-25 July 2003
TIA/EIA TSB-146
• IP telephony Support for Emergency Calling Service• Problem to be solved :
– Localization of IP phones and Mobile Phones in corporate environment.
– Ideally, accuracy should be chosen so as to differentiate between floors
• Current solution– SNMP (LAN equipment or remote powering device)– DHCP tracker– Bluetooth– Other ?
July 2003
Jean-Michel Lauriol, Alcatel
Slide 14
doc.: IEEE 802.11-03/462r0
IEEE 802.11 / San Francisco / 20-25 July 2003
Roadmap
• Publications : Q4’04
July 2003
Jean-Michel Lauriol, Alcatel
Slide 15
doc.: IEEE 802.11-03/462r0
IEEE 802.11 / San Francisco / 20-25 July 2003
TR-41/802.11 Liaison
• Need to establish official Liaison• How to work together ?
– Proposal :• E-mails between TR-41.4 chair and chairs of IEEE 802.11 sub-
groups (Which groups ?)• TR-41.4 informs periodically the status of our works dealing
with IEEE 802.11 topics
– Which contact points (WNG, 11e, 11i, …)?
• Next TR-41 meeting is week of August 18-22 in Montreal (Canada).
• Public FTP site for TR-41.4 www.tiaonline.org