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Wireless & VoIP. Christian Huitema February 26, 2000. Wireless Voice over IP: 2 Questions. Can we make it work? Can we provide decent quality? Can we support efficient signaling? Can the telcos accept it? Loose control of voice? Loose control on “services” ?.

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wireless voip

Wireless & VoIP

Christian Huitema

February 26, 2000

wireless voice over ip 2 questions
Wireless Voice over IP:2 Questions
  • Can we make it work?
    • Can we provide decent quality?
    • Can we support efficient signaling?
  • Can the telcos accept it?
    • Loose control of voice?
    • Loose control on “services” ?
components of delay
Components of delay
  • Network (delay, jitter):
    • Access Network, Uplink
    • Core Network,
    • Access Network, Downlink
  • Packetization, De-Packetization
  • Device:
    • Acquisition, Echo control, Compression,
    • Jitter, Decompression, Playback
managing the uplink beware of contention
Managing the Uplink:beware of contention
  • Data Usage emphasizes “load”
    • Highly variable sources,
    • Contention access fits best (CSMA, TDMA-DA, slot request, etc.)
  • Contention access unfit for voice
    • Generates “large deviation”
    • Deviation => jitter => delay.
  • … Unless very low load factor
voice quality effects of packet losses
Voice Quality: Effects of Packet Losses
  • Loss effect aggravated by “fractal” distribution.
  • Moderate losses (1%) can be concealed.
  • Higher losses require redundancy: (standard in RTP):
    • Affects bandwidth (split / N packets)
    • affects delay (N packets) => quality…
uplink starvation control bandwidth packet rate
Uplink Starvation => Control Bandwidth, Packet Rate

Core Network

Edge

Router,

Radio

?

Authorize

  • Signaling:
    • Voice Call ?
    • Quality ?

Network Control

can we do efficient signaling wireless voip mobility
Can we do efficient signaling?Wireless VoIP => Mobility
  • Classic telephony approach:
    • HLR (home) /VLR (visitor)
    • Based on phone number
    • Number = Transport + User identity.
  • VoIP separates network, service
    • Network: IP address
    • Service: DNS name, e-mail, URL
  • Need clean architecture
the voip protocol soup more than one choice
The VoIP Protocol SoupMore than one choice…
  • H.323
    • ITU standard, implementations
    • Complex, heavy, hard to evolve
  • MGCP
    • Client server, “telephony device”
    • Used in Cable networks
    • Not really adequate for mobility support
    • MGCP / Megaco / H.248 debacle
  • SIP
    • Clean end-to-end architecture
signaling mobility combine mobile ip sip

DHCP

Register

DHCP

Invite

DHCP

Register

Invite #2

Signaling & Mobility: Combine “Mobile IP”, SIP

SIP agent

Correspondent

can the telcos accept voip wireless voip
Can the telcos accept VoIP? Wireless VoIP?
  • Special price for voice, data:
    • Wire line: price of voice is 10 x data bit
    • Wireless: data is “special service.”
  • Bundling of services:
    • Caller-ID, Call-Waiting,
    • Voice Mail,
    • 3000 “IN” services
    • 911, etc.
wireless voip loosing control of voice
Wireless VoIP:loosing control of voice?
  • In the short term, QoS issues
    • Contention on the uplink,
    • Telco can control “voice quality IP”,
    • But “real time” is more than voice (video, games, monitoring.)
  • The end of uplink starvation?
    • High speed wireless LAN, 3GIP?
    • Need adequate “sharing” procedure.
wireless voip becoming the infrastructure
Wireless VoIP:becoming “the” infrastructure
  • Need to be always on, meet the classic 99.999% requirement,
  • Deal with societal issues, such as wiretap, in an end-to-end environment,
  • Provide 911 like services:
    • Special signaling, no hang-up,
    • Location services, route to local 911,
    • “Emergency” level for QoS.
wireless voip loosing control of services
Wireless VoIP:loosing control of services
  • IP signaling is end to end
    • SIP agent “outside” the network,
    • Service independent of transport.
  • State is kept in the device:
    • Local implementation of services,
    • Call waiting, multiparty call in device.
  • Empower users, unleash creativity
wireless voip roadmap
Wireless VoIP Roadmap
  • Solve the uplink issue:
    • QoS on “first hop”, not end-to-end,
    • Independent of payload type (voice, etc.)
    • Security, authorization (DHCP, QoS).
  • Encourage competition:
    • “Secure Wireless DHCP,” Roaming
  • Concentrate signaling work on SIP:
    • Forget the ITU!
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