Packet Voice Radio

1
Packet Voice Radio

• Alvin H. BurgemeisterB-twelve Associates,
  Inc.Connexion by Boeing

2
Push-to-Talk Voice Radio

• Packet Service Each radio transmission may be
  defined as a separate packet of information
• CSMA Protocol Sender listens for a break in
  radio traffic, then presses the talk button
• Half-duplex Only one sender at a time on the
  channel

3
Aeronautical Voice Radio

• Radio channel per control sector Aircraft must
  change channel at every crossing
• Party line All stations on channel hear all
  transmissions (within range)
• SELCAL Used for HF and for AOC to reduce
  cockpit workload

4
Packet Digital Voice

• New operational concept enabled by new technology
• Digital voice encoding and compression
• High speed data links air lt-gt ground
• Digital recording and playback of voice
  transmission
• Automated queuing and retransmission of message

5
Digitize and Packetize
6
Route and Transmit
7
Receive and Store
8
Decode and Listen
9
Advantages

• Pilot/Controller not CSMA protocol engine
• Workload
• Spectrum efficiency
• Message integrity and delivery
• Repeat of misunderstood message
• Optimum use of channels
• Optimum choice of radio link
• No party line

10
Challenges

• New concept of communications
• New human interface to use new capabilities
• Discrete address for each station
• Controller visual correlation with audio
• No party line

11
Potential New Uses

• Security
• Authentication
• Encryption
• Voice over HFDL
• Simplified AOC Voice
• No SELCAL or dedicated radio
• Cockpit to Dispatch or Maintenance
• Cabin

12
Conclusions

• Packetized Voice has significant potential
• Optimize radio spectrum
• Reduce pilot and controller workload
• Provide new capabilities
• New concept of communications
• Research needed to integrate into environment
• Need to overcome resistance to change