Reference signals and common search space for enhanced control channels
First Claim
1. A method for receiving a reference signal (RS) by a user equipment (UE), the method comprising:
- receiving at least one broadcast signal from a base station;
determining a first location in a downlink bandwidth in a first set of physical resource blocks (PRBs) for reception of a first physical downlink control channel (PDCCH) based on the at least one broadcast signal;
determining a second location in the downlink bandwidth in a second set of PRBs for reception of a second PDCCH based on a higher layer signaling; and
receiving the RS in the first set of PRBs based on the first location or in the second set of PRBs based on the second location,wherein the RS is scrambled by a sequence determined based on a physical identity of the base station, in a case that the RS is received in the first set of PRBs, andwherein the RS is scrambled by a sequence determined based on the higher layer signaling, in a case that the RS is received in the second set of PRBs.
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Abstract
Methods and apparatuses for a User Equipment (UE) to receive signaling of UE-common Downlink Control Information (DCI) in a set of Physical Resource Blocks (PRBs) over a Transmission Time Interval (TTI) are provided. The UE demodulates UE-common DCI using a Reference Signal (RS) that is scrambled by a UE-common scrambling sequence. The UE may assume that RS having a same precoding is transmitted in the set of PRBs over different TTIs. The UE may determine the scrambling sequence implicitly from an identity of a point transmitting the UE-common DCI or explicitly by higher layer signaling. The UE may determine the PRBs of UE-common DCI transmission by broadcast signaling or by higher layer signaling.
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Citations
16 Claims
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1. A method for receiving a reference signal (RS) by a user equipment (UE), the method comprising:
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receiving at least one broadcast signal from a base station; determining a first location in a downlink bandwidth in a first set of physical resource blocks (PRBs) for reception of a first physical downlink control channel (PDCCH) based on the at least one broadcast signal; determining a second location in the downlink bandwidth in a second set of PRBs for reception of a second PDCCH based on a higher layer signaling; and receiving the RS in the first set of PRBs based on the first location or in the second set of PRBs based on the second location, wherein the RS is scrambled by a sequence determined based on a physical identity of the base station, in a case that the RS is received in the first set of PRBs, and wherein the RS is scrambled by a sequence determined based on the higher layer signaling, in a case that the RS is received in the second set of PRBs. - View Dependent Claims (2, 3, 4)
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5. A user equipment (UE) apparatus for receiving a reference signal (RS), the apparatus comprising:
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a receiver configured to receive at least one broadcast signal from a base station and to receive the RS in a first set of physical resource blocks (PRBs) or a second set of PRBs; and a processor configured to; determine a first location in a downlink bandwidth in the first set of PRBs for reception of a first physical downlink control channel (PDCCH) based on the at least one broadcast signal, determine a second location in the downlink bandwidth in a second set of PRBs for reception of a second PDCCH based on a higher layer signaling, and control to receive the RS in the first set of PRBs based on the first location or in the second set of PRBs based on the second location, wherein the RS is scrambled by a sequence determined based on a physical identity of the base station, in a case that the RS is received in the first set of PRBs, and wherein the RS is scrambled by a sequence determined based on the higher layer signaling, in a case that the RS is received in the second set of PRBs. - View Dependent Claims (6, 7, 8)
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9. A method for transmitting a reference signal (RS) by a base station, the method comprising:
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transmitting at least one broadcast signal to a user equipment (UE); determining a first location in a downlink bandwidth in a set of physical resource blocks (PRBs) for reception of a first physical downlink control channel (PDCCH) based on the at least one broadcast signal; determining a second location in the downlink bandwidth in a second set of PRBs for reception of a second PDCCH based on a higher layer signaling; and transmitting the RS in the first set of PRBs based on the first location or in the second set of PRBs based on the second location, wherein the RS is scrambled by a sequence determined based on a physical identity of the base station, in a case that the RS is received in the first set of PRBs, and wherein the RS is scrambled by a sequence determined based on the higher layer signaling, in a case that the RS is received in the second set of PRBs. - View Dependent Claims (10, 11, 12)
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13. A base station (BS) apparatus for transmitting a reference signal (RS), the apparatus comprising:
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a transmitter configured to transmit at least one broadcast signal from a base station and to transmit the RS in a first set of physical resource block (PRB)s or a second set of PRBs; and a processor configured to; determine a first location in a downlink bandwidth in the first set of PRBs for reception of a physical downlink control channel (PDCCH) based on the at least one broadcast signal, determine a second location in the downlink bandwidth in a second set of PRBs for reception of a second PDCCH based on a higher layer signaling, and control to transmit the RS in the first set of PRBs based on the first location or in the second set of PRBs based on the second location, wherein the RS is scrambled by a sequence determined based on a physical identity of the base station, in a case that the RS is received in the first set of PRBs, and wherein the RS is scrambled by a sequence determined based on the higher layer signaling, in a case that the RS is received in the second set of PRBs. - View Dependent Claims (14, 15, 16)
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Specification