NG-RSP (success) MS RNG-RSP processing time passed Wait for SBC-REQ (T9 expires) Send RNG-RSP (abort) OrtoQtained RNG-REQ/Process RNG-REQ re-transmission/Send RNG-RSP (abort) Authenticated Obtained SBC-REQ Obtained SBC-REQ/Process Process SBC-REQ SBC-REQ re-transmission (T17 expires or authentication failed)/ Not Authenticated Send RNG-RSP (abort) Obtained SBC-REQ / Authentication Process SBC-REQ and Key re-transmission Exchange Authenticated by PKM Not Authenticated/ Obtained SBC-REQ Process SBC-REQ re-transmission (T17 expires) Wait for Send RNG-RSP (abort) or REG-REQ RES-CMD Perform RS neighbor measurement Perform RS neighbor measurement report report/ Obtained REG-REQ/Process REG-REQ Obtained REG-REQ/ Process REG-REQ re-transmission (T 64 expires) Wait for Send RNG-RSP (abort) or RES-CMD RS NBR M EAS-REP (Access station unchanged) Obtained RS NBR MEAS Obtained RS_NBR MEAS-REP/ Re-transmit RS_ Config-CMD Send RS Config-CMD (T 68 expires) Send RNG-RSP (abort) Wait for ACK Obtained (Access station changed ) Obtained RS NBR MEAS-REP/ Wait for Send RS_AccessRS-REQ Action Frame Number Action Frame Number (T73 expires) Send RNG-RSP (abort) (T70 expires) Relay Send RNG-RSP (abort) Operational Obtained RS NBR MEAS- Re-transmit RS AccessRS-REQ Wait for ACK Obtained RS NBR MEAS-REP/ Obtained Process re-transmission/ Send RS_AccessRS-REQ Wait for RNG-REQ from the same relay FIGURE 4-20 Network entry state machine of the relay-enabled BS [10] 4.5 Operational states of femto base stations downlink channel Establish DL/sync/ Obtained UL parameters Wait for T3 expired and retries exhausted or (T3 expired and retries exhausted) Received RNG-RSP (abort) ranging or Received RNG-RSP (abort) opportunity Obtained ranging opportunity/ Received RNG-RSP Send CDMA code (continue) or T3 expired Obtained RNG-RSP (abort) with Preamble Index/ Scan another access station Wait for RNG-RSP or T3 expired and more retries allocation IE Obtained CMDA Allocation IE/ Send RNG-REQ with ranging CID (for normal network entry) or Send RNG-REQ with RS