Transmission of UE-specific reference signal for wireless communication

An apparatus for wireless communication, comprising:

• means for determining whether to transmit data on one layer or multiple layers;
• means for selecting a set of subcarriers from among a plurality of possible sets of subcarriers for a user equipment-specific reference signal (UE-RS) based on a frequency shift if data is transmitted on one layer, the plurality of sets of subcarriers being offset in frequency and non-overlapping;
• means for selecting a predetermined set of subcarriers for the UE-RS if data is transmitted on multiple layers;
• and
• means for transmitting the UE-RS on the selected subcarriers.

An apparatus for wireless communication, comprising:

• at least one processor configured to:
• determine whether to transmit data on one layer or multiple layers;
• select a set of subcarriers from among a plurality of possible sets of subcarriers for a user equipment-specific reference signal (UE-RS) based on a frequency shift if data is transmitted on one layer, the plurality of sets of subcarriers being offset in frequency and non-overlapping;
• select a predetermined set of subcarriers for the UE-RS if data is transmitted on multiple layers;
• and
• send the UE-RS on the selected subcarriers.

A computer program product, comprising:

• a non-transitory computer-readable medium comprising:
• code for causing at least one computer to determine whether to transmit data on one layer or multiple layers,
• code for causing the at least one computer to select a set of subcarriers from among a plurality of possible sets of subcarriers for a user equipment-specific reference signal (UE-RS) based on a frequency shift if data is transmitted on one layer, the plurality of sets of subcarriers being offset in frequency and non-overlapping;
• code for causing the at least one computer to select a predetermined set of subcarriers for the UE-RS if data is transmitted on multiple layers;
• and
• code for causing the at least one computer to send the UE-RS on the selected subcarriers.

A method for wireless communication, comprising:

• selecting a set of subcarriers for a user equipment-specific reference signal (UE-RS) from among a plurality of possible sets of subcarriers based on a frequency shift if data is transmitted on one layer, the plurality of sets of subcarriers being offset in frequency and non-overlapping;
• selecting a predetermined set of subcarriers for the UE-RS if data is transmitted on multiple layers;
• and
• receiving the UE-RS on the selected subcarriers at a UE.

An apparatus for wireless communication, comprising:

• means for selecting a set of subcarriers for a user equipment-specific reference signal (UE-RS) from among a plurality of possible sets of subcarriers based on a frequency shift if data is transmitted on one layer, the plurality of sets of subcarriers being offset in frequency and non-overlapping;
• means for selecting a predetermined set of subcarriers for the UE-RS if data is transmitted on multiple layers;
• and
• means for receiving the UE-RS on the selected subcarriers at a UE.

A method of wireless communication, comprising:

• determining subcarriers for a user equipment specific reference signal (UE-RS) based at least in part on a number of layers to use for data transmission, including:
• determining a first set of subcarriers for the UE-RS from among a plurality of possible sets of subcarriers based on a frequency shift associated with a cell identifier when the number of layers to use for data transmission is one, the plurality of sets of subcarriers being offset in frequency and non-overlapping;
• and
• determining second subcarriers independent of the cell identifier when the number of layers to use for data transmission is more than one;
• and
• mapping reference symbols for the UE-RS to the first or second subcarriers for transmission.

A method for wireless communication, comprising:

• determining at least one frequency shift;
• determining a set of subcarriers for a plurality of user equipment-specific reference signals (UE-RSs) from among a plurality of possible sets of subcarriers based on the at least one frequency shift, the plurality of sets of subcarriers being offsent in frequency and non-overlapping;
• and
• transmitting the plurality of UE-RSs on the determined subcarriers on a plurality of layers to at least one UE.

An apparatus for wireless communication, comprising:

• means for determining at least one frequency shift;
• means for determining a set of subcarriers for a plurality of user equipment-specific refernce signals (UE-RSs) from among a plurality of possible sets of subcarriers based on the at least one frequency shift, the plurality of sets of subcarriers being offset in frequency and non-overlapping;
• and
• means for transmitting the plurality of UE-RSs on the determined subcarriers on a plurality of layers to at least one UE.

A method for wireless communication, comprising:

• determining a frequency shift;
• determining a set of subcarriers for a user equipment-specific reference signal (UE-RS) from among a plurality of possible sets of subcarriers based on the frequency shift;
• and
• receiving the UE-RS on the determined subcarriers at a UE, wherein the UE-RS is one of a plurality of UE-RSs transmitted on a plurality of layers to at least one UE including the UE, the plurality of sets of subcarriers being offset in frequency and non-overlapping.

An apparatus for wireless communication, comprising:

• means for determining a frequency shift;
• means for determining a set of subcarriers for a user equipment-specific reference signal (UE-RS) from among a plurality of possible sets of subcarriers based on the frequency shift;
• and
• means for receiving the UE-RS on the determined subcarriers at a UE, wherein the UE-RS is one of a plurality of UE-RSs transmitted on a plurality of layers to at least one UE including the UE, the plurality of sets of subcarriers being offset in frequency and non-overlapping.

A method for wireless communication, comprising:

• determining a first set of subcarriers for a first user equipment-specific reference signal (UE-RS) transmitted by a plurality of cells to a first UE for coordinated multi-point (CoMP);
• determining a second set of subcarriers for a second UE-RS transmitted by the plurality of cells for a second UE for CoMP;
• transmitting the UE-RS on the determined first set of subcarriers to the first UE;
• and
• transmitting the second UE-RS on the second set of subcarriers to the second UE;
• wherein the first UE and the second UE are both scheduled for data transmission on at least one resource block, and wherein the first UE-RS and the second UE-RS are transmitted on the at least one resource block.

An apparatus for wireless communication, comprising:

• means for determining a first set of subcarriers for a first user equipment-specific reference signal (UE-RS) transmitted by a plurality of cells to a first UE for coordinated multi-point (CoMP);
• means for determining a second set of subcarriers for a second UE-RS transmitted by the plurality of cells for a second UE for CoMP;
• means for transmitting the UE-RS on the determined first set of subcarriers to the first UE;
• and
• means for transmitting the second UE-RS on the second set of subcarriers to the second UE;
• wherein the first UE and the second UE are both scheduled for data transmission on at least one resource block, and wherein the first UE-RS and the second UE-RS are transmitted on the at least one resource block.

A method for wireless communication, comprising:

• determining a first set of subcarriers for a first user equipment-specific reference signal (UE-RS) transmitted by a plurality of cells to a UE for coordinated multi-point (CoMP);
• and
• receiving the first UE-RS on the determined first set of subcarriers at the first UE;
• wherein the first UE and a second UE are both scheduled for data transmission on at least one resource block, and wherein the first UE-RS and a second UE-RS are transmitted on the at least one resource block.

An apparatus for wireless communication, comprising:

• means for determining a first set of subcarriers for a first user equipment-specific reference signal (UE-RS) transmitted by a plurality of cells to a UE for coordinated multi-point (CoMP);
• and
• means for receiving the first UE-RS on the determined first set of subcarriers at the first UE;
• wherein the first UE and a second UE are both scheduled for data transmission on at least one resource block, and wherein the first UE-RS and a second UE-RS are transmitted on the at least one resource block.