Block based preamble design for autonomous uplink transmissions

A method of wireless communication at a base station, comprising:

• assigning respective sets of preamble blocks to a set of user equipments (UEs) for autonomous uplink transmissions, each of the respective sets of preamble blocks assigned from a pool of preamble blocks;
• identifying a set of indexed sequences for transmission over the respective sets of preamble blocks;
• monitoring the pool of preamble blocks for composite sequences transmitted from the set of UEs over the respective sets of preamble blocks, each of the composite sequences including one or more indexed sequences of the set of indexed sequences;
• identifying one or more transmissions from one or more of the set of UEs based at least in part on detecting one or more corresponding composite sequences from the monitoring;
• and
• receiving the one or more transmissions.

An apparatus for wireless communication at a user equipment (UE), comprising:

• a processor, memory coupled with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the apparatus to:
• identify a set of preamble blocks for autonomous uplink transmissions, the set of preamble blocks being assigned by a base station from a pool of preamble blocks;
• identify an index for each preamble block of the set of preamble blocks, each of the identified indices corresponding to one of a set of indexed sequences;
• transmit one or more of the indexed sequences over the set of preamble blocks, the one or more of the indexed sequences corresponding to the identified indices for the set of preamble blocks;
• and
• transmit a data transmission during a transmission time interval (TTI) associated with the set of preamble blocks.

An apparatus for wireless communication at a base station, comprising:

• a processor, memory coupled with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the apparatus to:
• assign respective sets of preamble blocks to a set of user equipments (UEs) for autonomous uplink transmissions, each of the respective sets of preamble blocks assigned from a pool of preamble blocks;
• identify a set of indexed sequences for transmission over the respective sets of preamble blocks;
• monitor the pool of preamble blocks for composite sequences transmitted from the set of UEs over the respective sets of preamble blocks, each of the composite sequences including one or more indexed sequences of the set of indexed sequences;
• identify one or more transmissions from one or more of the set of UEs based at least in part on detecting one or more corresponding composite sequences from the monitoring;
• and
• receive the one or more transmissions.