System and method for random access channel capture with automatic retransmission request

A system for establishing a connection using random access channel (RACH) capture comprising:

• at least one transmitting user equipment (UE) having means for transmitting a plurality of successively increasing power level time-spaced preambles;
• at least one receiving Node B station having means for receiving one of said time-spaced preambles and means for returning an acquisition indicator signal (AI) in response thereto;
• said UE further comprising means responsive to said AI signal to terminate transmission of said time-spaced preambles, and means for generating a collision detection preamble (CDP) embedded in a RACH message for transmission to said receiving Node B subsequent to receiving said AI signal;
• said receiving Node B station further comprising means for decoding said RACH message and for generating a collision detection indication (CDI) signal matching the CDP of a UE whose RACH message is incorrectly decoded at the receiving Node B and means for returning said CDI signal to the UE to request retransmission of the RACH message that was incorrectly decoded at the receiving Node B.

User equipment (UE) for establishing a connection with a NODE B station using random access channel (RACH) capture comprising:

• means for transmitting a plurality of successively increasing power level time-spaced preambles;
• means responsive to an acquisition indicator (AI) signal generated at a receiving NODE B station for terminating transmission of said time-spaced preambles;
• means for generating a collision detection preamble (CDP) embedded in a RACH message for transmission to the receiving NODE B station;
• and
• means for re-transmitting the RACH message in response to a collision detection indication (CDI) signal matching the CDP signal of the UE whose RACH message is incorrectly decoded at the receiving NODE B station.

A NODE B station for establishing a connection with user equipment (UE) using random access (RACH) capture comprising:

• means for receiving a time-spaced preamble from a UE;
• means for returning an acquisition indicator (AI) signal to a UE in response to receiving said time-spaced preamble;
• means for decoding a RACH message received from a UE;
• means for generating a CDI signal corresponding to the CDP of a UE whose RACH message is incorrectly decoded;
• and
• means for returning the CDI signal to the UE to request re-transmission of the RACH message from the UE.