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TAI - Timing Advance Index

The MS (Mobile Station) performing uplink or downlink packet transfer, will receive a packet uplink or downlink assignment message. This message will contain the MS assigned TAI and the PTCCH (Packet Timing Control Channel). The TAI specifies which PTCCH subchannel is to be used by the MS.


  • Fully interactive 3GPP based network map
  • Narrated call flows
  • Detailed network procedures

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