Dedicated reference signal design for network MIMO

A wireless communications apparatus including a first base station, the first base station comprising:

• a memory that retains instructions related to:
• synchronizing with a second base station to coordinate a data transmission to a first mobile device;
• applying a cluster-specific scrambling to a first data modulation symbol and to a first pilot modulation symbol;
• transmitting in a first direction the scrambled first data modulation symbol of the data transmission such that transmission of the scrambled first data modulation symbol is coordinated with a transmission of the scrambled first data modulation symbol by the second base station in a second direction;
• and
• transmitting in the first direction the scrambled first pilot modulation symbol such that transmission of the scrambled first pilot modulation symbol is coordinated with a transmission of the scrambled first pilot modulation symbol by the second base station in the second direction;
• and
• a processor, coupled to the memory, configured to execute the instructions retained in the memory.

A wireless communications apparatus that utilizes a dedicated reference signal for supporting Coordinated MultiPoint transmission, comprising:

• means for communicating with a second base station to coordinate a data transmission to a first user device from a first base station and the second base station;
• means for applying a cluster-specific scrambling to a first data modulation symbol and to a first pilot modulation symbol;
• means for transmitting in a first direction the scrambled first data modulation symbol of the data transmission from the first base station such that transmission of the scrambled first data modulation symbol is coordinated with a transmission of the scrambled first data modulation symbol by the second base station in a second direction;
• and
• means for transmitting in the first direction, the scrambled first pilot modulation symbol from the first base station such that transmission of the scrambled first pilot modulation symbol is coordinated with a transmission of the scrambled first pilot modulation symbol by the second base station in the second direction.

A computer program product, comprising:

• a non-transitory computer-readable medium comprising:
• a first set of codes for causing a computer to synchronize a transmission of a first data modulation symbol to a first mobile device;
• a second set of codes for causing the computer to have a first base station apply a cluster-specific scrambling to a first data modulation symbol and to a first pilot modulation symbol;
• a third set of codes for causing the computer to have a first base station transmit in a first direction the scrambled first data modulation symbol and the scrambled first pilot modulation symbol in accordance with the synchronizing;
• and
• a fourth set of codes for causing the computer to have a second base station transmit in a second direction the scrambled first data modulation symbol and the scrambled first pilot modulation symbol in accordance with the synchronizing, wherein the synchronizing comprises employing cooperative beam-forming.

At least one processor configured to utilize a dedicated reference signal for supporting Coordinated MultiPoint transmission, comprising:

• a first module for coordinating a data transmission to a first user device from the first base station and a second base station;
• a second module for applying a cluster-specific scrambling to a first data modulation symbol and to a first pilot modulation symbol;
• a third module for transmitting in a first direction the scrambled first data modulation symbol of the data transmission from the first base station such that transmission of the scrambled first data modulation symbol is coordinated with a transmission of the scrambled first data modulation symbol by the second base station in a second direction;
• and
• a fourth module for transmitting in the first direction, the scrambled first pilot modulation symbol from the first base station such that transmission of the scrambled first pilot modulation symbol is coordinated with a transmission of the scrambled first pilot modulation symbol by the second base station in the second direction.

A method performed by a mobile device for receiving a dedicated reference signal for supporting Coordinated MultiPoint, comprising:

• receiving from a first direction a scrambled data modulation symbol intended for the mobile device;
• receiving a scrambled pilot modulation symbol from the first direction;
• receiving from a second direction the scrambled data modulation symbol intended for the mobile device;
• and
• receiving the scrambled pilot modulation symbol from the second direction substantially concurrent to the receiving the scrambled pilot modulation symbol from the first direction, wherein the data modulation symbol is received at the mobile device in connection with a coordinated transmission between a first base station and at least a second base station, and wherein a cluster-specific scrambling is applied by the first base station and the second base station before receiving from the first direction and before receiving from the second direction.

A wireless communications apparatus, comprising:

• a memory that retains instructions for:
• receiving from a first direction a scrambled data modulation symbol and receiving a scrambled pilot modulation symbol from the first direction;
• receiving from a second direction the scrambled data modulation symbol and receiving the scrambled pilot modulation symbol from the second direction substantially concurrent to the receiving the scrambled pilot modulation symbol from the first direction, wherein the scrambled data modulation symbol and the scrambled pilot modulation symbol received from the first direction are from a first node that coordinated with at least a second node transmitting the scrambled data modulation symbol and the scrambled pilot modulation symbol from the second direction, wherein a cluster-specific scrambling is applied by the first base station and the second base station before receiving from the first direction and before receiving from the second direction;
• and
• a processor, coupled to the memory, configured to execute the instructions retained in the memory.

A computer program product, comprising:

• a non-transitory computer-readable medium, comprising:
• a first set of codes for causing a computer to receive from a first direction a scrambled data modulation symbol and a scrambled pilot modulation symbol;
• and
• a second set of codes for causing the computer to receive from a second direction the scrambled data modulation symbol and the scrambled pilot modulation symbol, wherein transmission in the first direction and transmission in the second direction are synchronized between at least two transmitting base stations, wherein a cluster-specific scrambling is applied by the first base station and the second base station before receiving from the first direction and before receiving from the second direction.