Methods and apparatus for downlink control channels transmissions in wireless communications systems
First Claim
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1. A base station, comprising:
- a controller configured to determine a DeModulation Reference Signal (DMRS) antenna port for an extended Physical Downlink Control CHannel (ePDCCH) transmission based on at least a first parameter computed using an index for a leading extended Control Channel Element (eCCE) within the ePDCCH and a second parameter computed using an identifier for a user equipment (UE) to receive the ePDCCH transmission and the leading eCCE index; and
a transmitter configured to transmit symbols via the determined DMRS antenna port to the UE.
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Abstract
An antenna port for an extended Physical Downlink Control CHannel (ePDCCH) transmission is determined based on at least an identifier for a leading extended Control Channel Element (eCCE) within the ePDCCH and an identifier for a user equipment (UE) to receive the ePDCCH transmission, and based on whether the ePDCCH transmission is localized or distributed. The determined antenna port is a DeModulation Reference Signal (DMRS) port to which the UE is assigned. Symbols are mapped in sequence to resource elements (REs) and transmitted via the determined antenna port to the UE.
7 Citations
24 Claims
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1. A base station, comprising:
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a controller configured to determine a DeModulation Reference Signal (DMRS) antenna port for an extended Physical Downlink Control CHannel (ePDCCH) transmission based on at least a first parameter computed using an index for a leading extended Control Channel Element (eCCE) within the ePDCCH and a second parameter computed using an identifier for a user equipment (UE) to receive the ePDCCH transmission and the leading eCCE index; and a transmitter configured to transmit symbols via the determined DMRS antenna port to the UE. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method, comprising:
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determining a DeModulation Reference Signal (DMRS) antenna port for an extended Physical Downlink Control CHannel (ePDCCH) transmission based on at least a first parameter computed using an index for a leading extended Control Channel Element (eCCE) within the ePDCCH and a second parameter computed using an identifier for a user equipment (UE) to receive the ePDCCH transmission and the leading eCCE index; and transmitting symbols via the determined DMRS antenna port to the UE. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification