Reference signal design for LTE A
First Claim
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1. A method used in a wireless communications system, comprising:
- identifying at least two groups of user equipment (UEs);
signaling a different number of antenna ports to the least two groups of UEs;
creating a number of antenna ports for each group of UEs, wherein each antenna port corresponds to a linear combination of a subset of a number of physical transmit antennas and the number of created antenna ports is the number of antenna ports signaled to that group of UEs, and wherein the linear combination employed for different antenna ports for a particular group of UEs is linearly independent; and
transmitting a first reference signal for each of the antenna ports signaled to a first group of UEs using the linearly independent combination of transmit antennas associated with each antenna port for the first group of UEs and transmitting a second reference signal for each of the antenna ports signaled to a second group of UEs using the linearly independent combination of transmit antennas associated with each antenna port for the second group of UEs,wherein the first group of UEs comprises at least one non-legacy UE and the second group of UEs comprises at least one legacy UE, wherein the first group of UEs supports a greater number of antenna ports than the second group of UEs.
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Abstract
Systems and methodologies are described that facilitate creating antenna ports to correspond to two or more groups of user equipment (UEs). The subject innovation can organize two or more groups of user equipment and signal to each of the two or more groups a respective antenna port. The subject innovation can further communicate mapping information, a reference signal, or delay related to a linear combination in order to identify antenna ports. Based on such communicated information, the reference signal can be decoded in order to identify each antenna port.
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Citations
57 Claims
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1. A method used in a wireless communications system, comprising:
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identifying at least two groups of user equipment (UEs); signaling a different number of antenna ports to the least two groups of UEs; creating a number of antenna ports for each group of UEs, wherein each antenna port corresponds to a linear combination of a subset of a number of physical transmit antennas and the number of created antenna ports is the number of antenna ports signaled to that group of UEs, and wherein the linear combination employed for different antenna ports for a particular group of UEs is linearly independent; and transmitting a first reference signal for each of the antenna ports signaled to a first group of UEs using the linearly independent combination of transmit antennas associated with each antenna port for the first group of UEs and transmitting a second reference signal for each of the antenna ports signaled to a second group of UEs using the linearly independent combination of transmit antennas associated with each antenna port for the second group of UEs, wherein the first group of UEs comprises at least one non-legacy UE and the second group of UEs comprises at least one legacy UE, wherein the first group of UEs supports a greater number of antenna ports than the second group of UEs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A wireless communications apparatus, comprising:
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at least one processor configured to; identify at least two groups of user equipment (UEs); signal a different number of antenna ports to the least two groups of UEs; create a number of antenna ports for each group of UEs, wherein each antenna port corresponds to a linear combination of a subset of a number of physical transmit antennas and the number of created antenna ports is the number of antenna ports signaled to that group of UEs, and wherein the linear combination employed for different antenna ports for a particular group of UEs is linearly independent; and transmit a first reference signal for each of the antenna ports signaled to a first group of UEs using the linearly independent combination of transmit antennas associated with each antenna port for the first group of UEs and transmitting a second reference signal for each of the antenna ports signaled to a second group of UEs using the linearly independent combination of transmit antennas associated with each antenna port for the second group of UEs, wherein the first group of UEs comprises at least one non-legacy UE and the second group of UEs comprises at least one legacy UE, wherein the first group of UEs supports a greater number of antenna ports than the second group of UEs; and a memory coupled to the at least one processor. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A wireless communications apparatus that optimizes configuration of transmit antennas, comprising:
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means for identifying at least two groups of user equipment (UEs); means for signaling a different number of antenna ports to the least two groups of UEs; means for creating a number of antenna ports for each group of UEs, wherein each antenna port corresponds to a linear combination of a subset of a number of physical transmit antennas and the number of created antenna ports is the number of antenna ports signaled to that group of UEs, and wherein the linear combination employed for different antenna ports for a particular group of UEs is linearly independent; and means for transmitting a first reference signal for each of the antenna ports signaled to a first group of UEs using the linearly independent combination of transmit antennas associated with each antenna port for the first group of UEs and transmitting a second reference signal for each of the antenna ports signaled to a second group of UEs using the linearly independent combination of transmit antennas associated with each antenna port for the second group of UEs, wherein the first group of UEs comprises at least one non-legacy UE and the second group of UEs comprises at least one legacy UE, wherein the first group of UEs supports a greater number of antenna ports than the second group of UEs. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. A computer program product, comprising:
a non-transitory computer-readable medium comprising; code for causing at least one computer to identify at least two groups of user equipment (UEs); code for causing at least one computer to signal a different number of antenna ports to the least two groups of UEs; code for causing at least one computer to create a number of antenna ports for each group of UEs, wherein each antenna port corresponds to a linear combination of a subset of a number of physical transmit antennas and the number of created antenna ports is the number of antenna ports signaled to that group of UEs, and wherein the linear combination employed for different antenna ports for a particular group of UEs is linearly independent; and code for causing at least one computer to transmit a first reference signal for each of the antenna ports signaled to a first group of UEs using the linearly independent combination of transmit antennas associated with each antenna port for the first group of UEs and transmitting a second reference signal for each of the antenna ports signaled to a second group of UEs using the linearly independent combination of transmit antennas associated with each antenna port for the second group of UEs, wherein the first group of UEs comprises at least one non-legacy UE and the second group of UEs comprises at least one legacy UE, wherein the first group of UEs supports a greater number of antenna ports than the second group of UEs. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56)
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57. A method used in a wireless communications system, comprising:
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identifying a group of legacy user equipments (UEs) and a group of non-legacy UEs; signaling a different number of antenna ports to the group of legacy UEs and the group of non-legacy UEs; creating a number of antenna ports for each group of UEs, wherein each antenna port corresponds to a linear combination of a subset of a number of physical transmit antennas and the number of created antenna ports is the number of antenna ports signaled to that group of UEs, and wherein the linear combination employed for different antenna ports for a particular group of UEs is linearly independent; and transmitting a first reference signal for each of the antenna ports signaled to the group of non-legacy UEs using the linearly independent combination of transmit antennas associated with each antenna port for the group of non-legacy UEs and transmitting a second reference signal for each of the antenna ports signaled to the group of legacy UEs using the linearly independent combination of transmit antennas associated with each antenna port for the group of legacy UEs; wherein the first group of UEs comprises at least one non-legacy UE and the second group of UEs comprises at least one legacy UE, wherein the first group of UEs supports a greater number of antenna ports than the second group of UEs.
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Specification