Reference signals and common search space for enhanced control channels
AssigneeSamsung Electronics Co., Ltd.
InventorsAris Papasakellariou, Hyoung-Ju Ji
Life of this patent
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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.
Claims16
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, 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.
A user equipment (UE) apparatus for receiving a reference signal (RS), the apparatus comprising:
- 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.
A method for transmitting a reference signal (RS) by a base station, the method comprising:
- 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.
A base station (BS) apparatus for transmitting a reference signal (RS), the apparatus comprising:
- 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.
Dependencies are inferred from the claim text.