WiMAX Forum Certified
Wassim El Khoury, Network Expansion Manager, Pesco
Lebanon
"We have been an Aperto customer for some time and know that PacketMAX is the ideal solution for our offerings... Like many service providers, we are concerned with the cost of deploying and managing WiMAX... with Aperto's WaveCenter EMS product, PacketMAX lets us serve a huge number of customers with exceptional QoS and reliability."

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Power Saving Mechanisms

Mobile subscriber terminals must be small and light in order to be carried conveniently. To preserve the limited battery-life in such terminals, mobile WiMAX standard specifies mechanisms to ensure the mobile stations are not active when no data is being sent/received from the base station. The base station scheduler can switch the terminals to and from Active, Idle, Sleep and Inactive modes depending on activity levels.

 

  • Active State
    • MS Normal Tx or Rx
  • -MS requests BS to enter sleep mode to save power
  • -Sleep mode 'start frame' is indicated
  • Sleep State
  • -MS sleeps for integer # of frames called sleep interval
  • -No MS Tx or Rx during this interval
  • -Power saving classes supported provide flexible wake up methods
  • Listen State
  • -MS Listens for integer number of frames called listening interval
  • -Paging detected in this interval
  • -If Data traffic waiting on BS it is indicated
  • Idle Mode
  • -MS uses special mode called "Idle mode" to receive broadcast/multicast service without registration at specific BS
  • -DL traffic received but no UL Tx within broadcast region
  • -Paging controller (in the network) co-ordinates DL traffic and paging groups

PacketMAX systems support both open loop and closed loop power management for greater flexibility.