Channel state information reference signals

A wireless communication apparatus, comprising:

• means for identifying a plurality of available data resource elements (REs) in a subframe;
• and
• means for assigning REs from the plurality of available data REs for data transmission to a wireless device in groups of a predetermined number of REs such that all assigned data REs within a group are within a predetermined number of symbols of each other in time domain and within a second predetermined number of subcarriers of each other in frequency domain, thereby resulting in at least one ungrouped RE.

A computer program product comprising a non-volatile computer-readable medium having computer-executable instructions stored thereon, said instructions comprising code for:

• identifying a plurality of available data resource elements (REs) in a subframe;
• and
• assigning REs from the plurality of available data REs for data transmission to a wireless device in groups of a predetermined number of REs such that all assigned data REs within a group are within a predetermined number of symbols of each other in time domain and within a second predetermined number of subcarriers of each other in frequency domain, thereby resulting in at least one ungrouped RE.

A wireless communication method, comprising:

• assigning an aperiodic transmission resource pattern to a reference signal having a periodicity of multiple subframes;
• and
• transmitting the reference signal according to the aperiodic transmission resource pattern.

A wireless communication apparatus comprising:

• means for assigning an aperiodic transmission resource pattern to a reference signal having a periodicity of multiple subframes;
• and
• means for transmitting the reference signal according to the aperiodic transmission resource pattern.

A wireless communication method, comprising:

• allocating resources to a transmitter of the reference signal depending on a power class of the transmitter;
• and
• performing, using the allocated resources, transmission of the reference signal from the transmitter.

A wireless communication apparatus, comprising:

• means for allocating resources to a transmitter of the reference signal depending on a power class of the transmitter;
• and
• means for performing, using the allocated resources, transmission of the reference signal from the transmitter.

A computer program product comprising a non-volatile computer-readable medium having instructions stored thereon, said instructions comprising code for:

• allocating resources to a transmitter of the reference signal depending on a power class of the transmitter;
• and
• performing, using the allocated resources, transmission of the reference signal from the transmitter.

A wireless communication method, comprising:

• identifying a plurality of available data resource elements (REs) in a subframe;
• and
• assigning the plurality of available data REs to data transmission in at least one space frequency block coding (SFBC) group and at least one space time block coding (STBC) group, thereby resulting in no unused REs.

A wireless communication apparatus, comprising:

• means for identifying a plurality of available data resource elements (REs) in a subframe;
• and
• means for assigning all of the plurality of remaining data REs to data transmission in at least one space frequency block coding (SFBC) group and at least one space time block coding (STBC) group, thereby resulting in no ungrouped REs.

A computer program product comprising a non-volatile computer-readable medium having instructions stored thereon, said instructions comprising code for:

• identifying a plurality of available data resource elements (REs) in a subframe;
• and
• assigning all of the plurality of remaining data REs to data transmission in at least one space frequency block coding (SFBC) group and at least one space time block coding (STBC) group, thereby resulting in no ungrouped REs.

A wireless communication processor, configured to:

• identify a plurality of available data resource elements (REs) in a subframe;
• and
• assign all of the plurality of remaining data REs to data transmission in at least one space frequency block coding (SFBC) group and at least one space time block coding (STBC) group, thereby resulting in no ungrouped REs.

A method of wireless communication, comprising:

• receiving a reference signal in a subframe from REs assigned to transmissions of the reference signal, wherein the subframe comprises a plurality of remaining data REs;
• and
• receiving data from at least one of the plurality of remaining data REs, wherein the data is transmitted in groups of a predetermined number of REs such that all assigned data REs within a group are within a predetermined number of symbols in time and a second predetermined number of REs in frequency of each other, thereby resulting in at least one ungrouped RE.

A wireless communication apparatus, comprising:

• means for receiving a reference signal in a subframe from REs assigned to transmissions of the reference signal, wherein the subframe comprises a plurality of remaining data REs;
• and
• means for receiving data from at least one of the plurality of remaining data REs, wherein the data is transmitted in groups of a predetermined number of REs such that all assigned data REs within a group are within a predetermined number of symbols in time and a second predetermined number of REs in frequency of each other, thereby resulting in at least one ungrouped RE.

A method of wireless communication, comprising:

• receiving a reference signal transmission in a subset of resource elements (REs) of a symbol, wherein at least some of remaining REs of the symbol are muted and wherein the reference signal received at a boosted transmission power level;
• and
• transmitting a feedback message based on the received reference signal.

A wireless communication apparatus, comprising:

• means for receiving a reference signal transmission in a subset of resource elements (REs) of a symbol, wherein at least some of remaining REs of the symbol are muted and wherein the reference signal received at a boosted transmission power level;
• and
• means for transmitting a feedback message based on the received reference signal.

A wireless communication method, comprising:

• receiving information about an aperiodic transmission resource pattern assigned to a reference signal, the aperiodic transmission resource pattern having a periodicity of multiple subframes;
• and
• receiving the reference signal according to the aperiodic transmission resource pattern.

A wireless communication apparatus, comprising:

• means for receiving information about an aperiodic transmission resource pattern assigned to a reference signal, the aperiodic transmission resource pattern having a periodicity of multiple subframes;
• and
• means for receiving the reference signal according to the aperiodic transmission resource pattern.

A wireless communication method, comprising:

• receiving a subframe-dependent pattern of transmission resources assigned to a reference signal, wherein the subframe-dependent pattern is varied over a plurality of subframes such that all available transmission resources are used at least once;
• and
• receiving a control signal in a subframe at a transmission resource allocated to the reference signal in another subframe in the plurality of subframes.

A wireless communication apparatus, comprising:

• means for receiving a subframe-dependent pattern of transmission resources assigned to a reference signal, wherein the subframe-dependent pattern is varied over a plurality of subframes such that all available transmission resources are used at least once;
• and
• means for receiving a control signal in a subframe at a transmission resource allocated to the reference signal in another subframe in the plurality of subframes.

A wireless communication method, comprising:

• receiving a reference signal in a subset of resource elements (REs) in a subframe;
• and
• receiving at least one data transmission comprising a space time block coding (STBC) group, in an RE not in the subset of REs of the subframe.

A wireless communication apparatus, comprising:

• means for receiving a reference signal in a subset of resource elements (REs) in a subframe;
• and
• means for receiving at least one data transmission comprising a space time block coding (STBC) group, in an RE not in the subset of REs of the subframe.

A method for allocating resources for a transmission of a reference signal in a wireless communication system, the method comprising:

• allocating resources as a function of a number of transmit antennas used for transmission of the reference signal, the function being nested with respect to the number of transmit antennas such that a first resource pattern corresponding to a first number of transmit antennas is a superset of a second resource pattern corresponding a to a second number of transmit antennas when the first number is greater than the second number;
• and
• indicating the allocated resources in an allocation message.

An apparatus for allocating resources for a transmission of a reference signal in a wireless communication system, the apparatus comprising:

• means for allocating resources as a function of a number of transmit antennas used for transmission of the reference signal, the function being nested with respect to the number of transmit antennas such that a first resource pattern corresponding to a first number of transmit antennas is a superset of a second resource pattern corresponding a to a second number of transmit antennas when the first number is greater than the second number;
• and
• means for indicating the allocated resources in an allocation message.