Payload-less physical uplink measurement indication channel (PUMICH) design for uplink based mobility

An apparatus for wireless communications by a base station (BS), comprising:

• means for selecting a first set of random access procedure (RACH) signatures, each RACH signature comprising a combination of one or more RACH sequences, from a second set of RACH signatures, wherein the second set of RACH signatures comprises a pruned set of RACH signatures of a set of all possible RACH signatures, and wherein the pruned set of RACH signatures includes one or more non-orthogonal RACH signatures;
• means for assigning RACH signatures only from the selected first set of RACH signatures to one or more user equipments (UEs) in a zone covered by the base station, wherein each of the one or more UEs is assigned a single RACH signature;
• means for receiving at least one RACH signature of the first set of RACH signatures from at least one of the one or more UEs, wherein the at least one RACH signature is received without a corresponding data payload identifying the at least one UE;
• and
• means for identifying the at least one UE based on the at least one RACH signature and the pruned set of RACH signatures.

An apparatus for wireless communications, comprising:

• a memory;
• and
• at least one processor coupled with the memory and configured to:
• select a first set of random access procedure (RACH) signatures, each RACH signature comprising a combination of one or more RACH sequences, from a second set of RACH signatures, wherein the second set of RACH signatures comprises a pruned set of RACH signatures of a set of all possible RACH signatures, and wherein the pruned set of RACH signatures includes one or more non-orthogonal RACH signatures;
• assign RACH signatures only from the selected first set of RACH signatures to one or more user equipments (UEs) in a zone covered by a base station, wherein each of the one or more UEs is assigned a single RACH signature;
• receiving at least one RACH signature of the first set of RACH signatures from at least one of the one or more UEs, wherein the at least one RACH signature is received without a corresponding data payload identifying the at least one UE;
• and
• identify the at least one UE based on the at least one RACH signature and the pruned set of RACH signatures.

A computer readable medium storing computer executable code thereon, comprising:

• code for selecting a first set of random access procedure (RACH) signatures, each RACH signature comprising a combination of one or more RACH sequences, from a second set of RACH signatures, wherein the second set of RACH signatures comprises a pruned set of RACH signatures of a set of all possible RACH signatures, and wherein the pruned set of RACH signatures includes one or more non-orthogonal RACH signatures;
• code for assigning RACH signatures only from the selected first set of RACH signatures to one or more user equipments (UEs) in a zone covered by a base station, wherein each of the one or more UEs is assigned a single RACH signature;
• code for receiving at least one RACH signature of the first set of RACH signatures from at least one of the one or more UEs, wherein the at least one RACH signature is received without a corresponding data payload identifying the at least one UE;
• and
• code for identifying the at least one UE based on the at least one RACH signature and the pruned set of RACH signatures.