Transmission and reception of dedicated reference signals

An apparatus for wireless communications, comprising:

• a memory unit;
• and
• at least one processor coupled to the memory unit, the at least one processer being configured:
• to generate a sequence for a user equipment-specific (UE-specific) reference signal, the UE-specific reference signal being used for downlink channel estimates by a specific UE;
• to generate a sequence for a cell-specific reference signal;
• to map the UE-specific reference signal sequence to first resources of a wireless channel by providing a first shift in frequency based on an integer value determined using a first function of a cell identifier (ID), the first function being a product of the cell ID and a modulus operation by a first integer;
• to map the cell-specific reference signal sequence to second resources of the wireless channel by providing a second shift in frequency based on an integer value determined using a second function of the cell ID, the second function being a product of the cell ID and a modulus operation by a second integer,
• the first function being different from the second function, and
• the first shift in frequency being different from the second shift in frequency;
• and
• to transmit the UE-specific reference signal and the cell-specific reference signal for downlink channel estimation.

An apparatus for wireless communications, comprising:

• means for generating a sequence for a user equipment-specific (UE-specific) reference signal, the UE-specific reference signal being used for downlink channel estimates by a specific UE;
• means for generating a sequence for a cell-specific reference signal;
• means for mapping the UE-specific reference signal sequence to first resources of a wireless channel by providing a first shift in frequency based on an integer value determined using a first function of a cell identifier (ID), the first function being a product of the cell ID and a modulus operation by a first integer;
• means for mapping the cell-specific reference signal sequence to second resources of the wireless channel by providing a second shift in frequency based on an integer value determined using a second function of the cell ID, the second function being a product of the cell ID and a modulus operation by a second integer,
• the first function being different from the second function, and
• the first shift in frequency being different from the second shift in frequency;
• and
• means for transmitting the UE-specific reference signal and the cell-specific reference signal for downlink channel estimation.

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

• program code to generate a sequence for a user equipment-specific (UE-specific) reference signal, the UE-specific reference signal being used for downlink channel estimates by a specific UE;
• program code to generate a sequence for a cell-specific reference signal;
• program code to map the UE-specific reference signal sequence to first resources of a wireless channel by providing a first shift in frequency based on an integer value determined using a first function of a cell identifier (ID), the first function being a product of the cell ID and a modulus operation by a first integer;
• program code to map the cell-specific reference signal sequence to second resources of the wireless channel by providing a second shift in frequency based on an integer value determined using a second function of the cell ID, the second function being a product of the cell ID and a modulus operation by a second integer,
• the first function being different from the second function, and
• the first shift in frequency being different from the second shift in frequency;
• and
• program code to transmit the UE-specific reference signal and the cell-specific reference signal for downlink channel estimation.

A method for wireless communications, comprising:

• analyzing symbols of a received wireless signal;
• identifying a user equipment-specific (UE-specific) reference signal and a cell-specific reference signal, the UE-specific reference signal and the cell-specific reference being used by a UE to perform downlink channel estimates;
• processing the UE-specific reference signal according to a first shift in frequency based on an integer value determined using a first function of a cell identifier (ID) for a cell associated with the received wireless signal, the first function being a product of a modulus operation by a first integer and the cell (ID);
• and
• processing the cell-specific reference signal according to a second shift in frequency based on an integer value determined using a second function of the cell ID, the second function being a product of the cell ID and a modulus operation by a second integer,
• the first function being different from the second function, and
• the first shift in frequency being different from the second shift in frequency.

An apparatus for wireless communications, comprising:

• a memory unit;
• and
• at least one processor coupled to the memory unit, the at least one processor being configured:
• to analyze symbols of a received wireless signal;
• to identify a user equipment-specific (UE-specific) reference signal and a cell-specific reference signal, the UE-specific reference signal and the cell-specific reference signal being used by a UE to perform downlink channel estimates;
• to process the UE-specific reference signal according to a first shift in frequency based on an integer value determined using a first function of a cell identifier (ID) for a cell associated with the received wireless signal, the first function being a product of a modulus operation by a first integer and the cell (ID);
• and
• to process the cell-specific reference signal according to a second shift in frequency based on an integer value determined using a second function of the cell ID, the second function being a product of the cell ID and a modulus operation by a second integer,
• the first function being different from the second function, and
• the first shift in frequency being different from the second shift in frequency.

An apparatus for wireless communications, comprising:

• means for analyzing symbols of a received wireless signal;
• means for identifying a user equipment-specific (UE-specific) reference signal and a cell-specific reference signal, the UE-specific reference signal and the cell-specific reference signal being used by a UE to perform downlink channel estimates;
• means for processing the UE-specific reference signal according to a first shift in frequency based on an integer value determined using a first function of a cell identifier (ID) for a cell associated with the received wireless signal, the first function being a product of a modulus operation by a first integer and the cell (ID);
• and
• means for processing the cell-specific reference signal according to a second shift in frequency based on an integer value determined using a second function of the cell ID, the second function being a product of the cell ID and a modulus operation by a second integer,
• the first function being different from the second function, and
• the first shift in frequency being different from the second shift in frequency.

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

• program code to analyze symbols of a received wireless signal;
• program code to identify a user equipment-specific (UE-specific) reference signal and a cell-specific reference signal, the UE-specific reference signal and the cell-specific reference signal being used by a UE to perform downlink channel estimates;
• program code to process the UE-specific reference signal according to a first shift in frequency based on an integer value determined using a first function of a cell identifier (ID) for a cell associated with the received wireless signal, the first function being a product of a modulus operation by a first integer and the cell (ID);
• and
• program code to process the cell-specific reference signal according to a second shift in frequency based on an integer value determined using a second function of the cell ID, the second function being a product of the cell ID and a modulus operation by a second integer,
• the first function being different from the second function, and
• the first shift in frequency being different from the second shift in frequency.