Cell ID and antenna port configurations for EPDCCH

An apparatus for wireless communications, comprising:

• means for mapping, at a first user equipment (UE), a receiver of the first UE to a set of antenna ports of a base station that are mapped to a second UE, such that the set of antenna ports are shared with the second UE, and a plurality of resource elements of the set of antenna ports are shared between the first UE and the second UE;
• means for configuring, at the first UE, the receiver to receive a first reference signal on a first set of resource elements of a first enhanced physical downlink control channel (EPDCCH) transmitted from the set of antenna ports, a second reference signal intended for the second UE transmitted on a second set of resource elements of a second EPDCCH from the set of antenna ports, the first set of resource elements and the second set of resource elements selected from the plurality of resource elements, and the first set of resource elements differing from the second set of resource elements;
• means for receiving, at the first UE from the base station, the first reference signal on the first set of resource elements of the first EPDCCH transmitted from the set of antenna ports;
• means for descrambling the received first reference signal based at least in part on a cell identification (ID) shared with the second UE;
• and
• means for demodulating a signal based at least in part on the descrambled first reference signal.

A non-transitory computer-readable medium having program code recorded thereon, comprising:

• program code to cause at least one computer to map, at a first user equipment (UE), a receiver of the first UE to a set of antenna ports of a base station that are mapped to a second UE, such that the set of antenna ports are shared with the second UE, and a plurality of resource elements of the set of antenna ports are shared between the first UE and the second UE;
• program code to cause the at least one computer to configure, at the first UE, the receiver to receive a first reference signal on a first set of resource elements of a first enhanced physical downlink control channel (EPDCCH) transmitted from the set of antenna ports, a second reference signal intended for the second UE transmitted on a second set of resource elements of a second EPDCCH from the set of antenna ports, the first set of resource elements and the second set of resource elements selected from the plurality of resource elements, and the first set of resource elements differing from the second set of resource elements;
• program code to cause the at least one computer to receive, at the first UE from the base station, the first reference signal on the first set of resource elements of the first EPDCCH transmitted from the set of antenna ports;
• program code to cause the at least one computer to descramble the received first reference signal based at least in part on a cell identification (ID) shared with the second UE;
• and
• program code to cause the at least one computer to demodulate a signal based at least in part on the descrambled first reference signal.

A first user equipment (UE) for wireless communications, comprising:

• a memory;
• and
• at least one processor coupled to the memory, the at least one processor configured:
• to map a receiver of the first UE to a set of antenna ports of a base station that are mapped to a second UE, such that the set of antenna ports are shared with the second UE, and a plurality of resource elements of the set of antenna ports are shared between the first UE and the second UE;
• to configure the receiver to receive a first reference signal on a first set of resource elements of a first enhanced physical downlink control channel (EPDCCH) transmitted from the set of antenna ports, a second reference signal intended for the second UE transmitted on a second set of resource elements of a second EPDCCH from the set of antenna ports, the first set of resource elements and the second set of resource elements selected from the plurality of resource elements, and the first set of resource elements differing from the second set of resource elements;
• to receive, from the base station, the first reference signal on the first set of resource elements of the first EPDCCH transmitted from the set of antenna ports;
• to descramble the received first reference signal based at least in part on a cell identification (ID) shared with the second UE;
• and
• to demodulate a signal based at least in part on the descrambled first reference signal.