Method and apparatus of using CDD like schemes with UE-RS based open loop beamforming
First Claim
1. A method of selectively providing cyclic delay diversity transmissions using user equipment reference signals, the method comprising:
- determining an operational state of a channel between a base station and a user equipment; and
signaling, based on the determined operational state, a transmission mode to the user equipment, wherein the transmission mode includes at least one transmission scheme including;
performing user equipment specific pilot transmissions in a resource block using a first precoding matrix; and
performing data transmissions in the resource block using one or more of a transformed version of the first precoding matrix used for the user equipment specific pilot transmissions, wherein the one or more of a transformed version of the first precoding matrix is obtained by;
determining a transformation matrix, wherein values of the transformation matrix are dependent on at least one of frequency and time; and
applying the transformation matrix to the first precoding matrix to obtain the one or more of a transformed version of the first precoding matrix.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and apparatus of wireless communication are disclosed. The wireless communication performs pilot signal transmissions using a first precoding matrix for user equipment specific pilot signals, the pilot signal transmissions having a first transmission rank. The wireless communication also performs data transmissions using a second precoding matrix for data when the data transmissions have a second transmission rank less than the first transmission rank, in which the second precoding matrix includes a transformed version of the first precoding matrix. Alternatively, the wireless communication can perform data transmissions using at least two precoding matrices for data when the data transmissions have a second transmission rank less than or equal to the first transmission rank. Accordingly, the precoding matrix used for data is a transformed version of the precoding matrix used for user equipment specific pilot signals.
38 Citations
28 Claims
-
1. A method of selectively providing cyclic delay diversity transmissions using user equipment reference signals, the method comprising:
-
determining an operational state of a channel between a base station and a user equipment; and signaling, based on the determined operational state, a transmission mode to the user equipment, wherein the transmission mode includes at least one transmission scheme including; performing user equipment specific pilot transmissions in a resource block using a first precoding matrix; and performing data transmissions in the resource block using one or more of a transformed version of the first precoding matrix used for the user equipment specific pilot transmissions, wherein the one or more of a transformed version of the first precoding matrix is obtained by; determining a transformation matrix, wherein values of the transformation matrix are dependent on at least one of frequency and time; and applying the transformation matrix to the first precoding matrix to obtain the one or more of a transformed version of the first precoding matrix. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. An apparatus for selectively providing cyclic delay diversity (CDD) transmissions using user equipment reference signals (UE-RS), comprising:
-
means for determining an operational state of a channel between a base station and a user equipment (UE); and means for signaling, based on the determined operational state, a transmission mode to the user equipment, wherein the transmission mode includes at least one transmission scheme including; performing user equipment specific pilot transmissions in a resource block using a first precoding matrix; and performing data transmissions in the resource block using one or more of a transformed version of the first precoding matrix used for the user equipment specific pilot transmissions, wherein the one or more of a transformed version of the first precoding matrix is obtained using; means for determining a transformation matrix, wherein values of the transformation matrix are dependent on at least one of frequency and time; and means for applying the transformation matrix to the first precoding matrix to obtain the one or more of a transformed version of the first precoding matrix. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
-
15. A wireless communication apparatus, comprising:
-
a memory for storing instructions to; determine an operational state of a channel between a base station and a user equipment; and signal, based on the determined operational state, a transmission mode to the user equipment, wherein the transmission mode includes at least one transmission scheme including; performing user equipment specific pilot transmissions in a resource block using a first precoding matrix; and performing data transmissions in the resource block using one or more of a transformed version of the first precoding matrix used for the user equipment specific pilot transmissions, wherein the one or more of a transformed version of the first precoding matrix is obtained using instructions to; determine a transformation matrix, wherein values of the transformation matrix are dependent on at least one of frequency and time; and apply the transformation matrix to the first precoding matrix to obtain the one or more of a transformed version of the first precoding matrix; and a processor for executing the instructions. - View Dependent Claims (16, 17, 18, 19, 20, 21)
-
-
22. A non-transitory tangible computer readable medium storing instructions, the instructions comprising:
-
code for determining an operational state of a channel between a base station and a user equipment; and code for signaling, based on the determined operational state, a transmission mode to the user equipment, wherein the transmission mode includes at least one transmission scheme including; performing user equipment specific pilot transmissions in a resource block using a first precoding matrix; and performing data transmissions in the resource block using one or more of a transformed version of the first precoding matrix used for the user equipment specific pilot transmissions, wherein the one or more of a transformed version of the first precoding matrix is obtained using; code for determining a transformation matrix, wherein values of the transformation matrix are dependent on at least one of frequency and time; and code for applying the transformation matrix to the first precoding matrix to obtain the one or more of a transformed version of the first precoding matrix. - View Dependent Claims (23, 24, 25, 26, 27, 28)
-
Specification