Enhanced physical downlink control channel scrambling and demodulation reference signal sequence generation
First Claim
Patent Images
1. An apparatus to be employed in a user equipment (UE), the apparatus comprising:
- channel estimation circuitry toreceive a reference signal sequence for a first antenna port on an orthogonal frequency division multiplexing (OFDM) symbol, andestimate a channel for the first antenna port for the UE based on the received reference signal sequence and an assumption that the reference signal sequence is transmitted to another UE for a second antenna port;
channel compensation circuitry coupled with the channel estimation circuitry to receive an estimate of the channel and compensate a received signal; and
decoding circuitry to perform a blind decoding operation for enhanced physical downlink control channel (EPDCCH) based on the assumption and a scrambling initialization seed cint given by
cint=└
ns/2┘
*29+NIDePDCCH,where ns is a slot number within a radio frame and NIDePDCCH is a virtual cell identifier that corresponds to an EPDCCH set in which downlink control information (DCI) is transmitted.
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Accused Products
Abstract
Methods, apparatuses, and systems are described to provide enhanced physical downlink control channel scrambling and demodulation reference signal sequence generation.
13 Citations
18 Claims
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1. An apparatus to be employed in a user equipment (UE), the apparatus comprising:
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channel estimation circuitry to receive a reference signal sequence for a first antenna port on an orthogonal frequency division multiplexing (OFDM) symbol, and estimate a channel for the first antenna port for the UE based on the received reference signal sequence and an assumption that the reference signal sequence is transmitted to another UE for a second antenna port; channel compensation circuitry coupled with the channel estimation circuitry to receive an estimate of the channel and compensate a received signal; and decoding circuitry to perform a blind decoding operation for enhanced physical downlink control channel (EPDCCH) based on the assumption and a scrambling initialization seed cint given by
cint=└
ns/2┘
*29+NIDePDCCH,where ns is a slot number within a radio frame and NIDePDCCH is a virtual cell identifier that corresponds to an EPDCCH set in which downlink control information (DCI) is transmitted. - View Dependent Claims (2, 3, 4, 5)
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6. One or more non-transitory, computer-readable media having instructions that, when executed, cause a user equipment (UE) to:
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receive a reference signal sequence for a first antenna port on an orthogonal frequency division multiplexing (OFDM) symbol; estimate a channel for the first antenna port for the UE based on the received reference signal sequence and an assumption that the reference signal sequence is transmitted to another UE for a second antenna port; receive an estimate of the channel and compensate a received signal; and blindly decode an enhanced physical downlink control channel (EPDCCH) based on the assumption and a scrambling initialization seed cint given by
cint=└
ns/2┘
*29+NIDePDCCH,where ns is a slot number within a radio frame and NIDePDCCH is a virtual cell identifier that corresponds to an EPDCCH set in which downlink control information (DCI) is transmitted. - View Dependent Claims (7, 8, 9, 10)
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11. One or more non-transitory, computer-readable media having instructions that, when executed, cause a user equipment (UE) to:
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determine a reference signal sequence received for a first antenna port for communications between the UE and an enhanced node B is also used for communications of a second antenna port; and perform a blind decoding operation for enhanced physical downlink control channel (EPDCCH) based on said determination and a scrambling initialization seed cint given
cint=└
ns/2┘
*29+NIDePDCCH,where ns is a slot number within a radio frame and NIDePDCCH is a virtual cell identifier that corresponds to an enhanced physical downlink control channel (EPDCCH) set in which downlink control information (DCI) is transmitted. - View Dependent Claims (12, 13)
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14. An apparatus to be employed in a user equipment (UE), the apparatus comprising circuitry to:
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receive a reference signal sequence for a first antenna port on an orthogonal frequency division multiplexing (OFDM) symbol, estimate a channel for the first antenna port for the UE based on the received reference signal sequence and determination that the reference signal sequence is transmitted to another UE for a second antenna port; and perform a blind decoding operation based on the determination and a scrambling initialization seed cint given by
cint=└
ns/2┘
*29+NIDePDCCH,where ns is a slot number within a radio frame and NIDePDCCH is a virtual cell identifier that corresponds to an enhanced physical downlink control channel (EPDCCH) set in which downlink control information (DCI) is transmitted. - View Dependent Claims (15, 16, 17, 18)
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Specification