Search process for physical downlink control channels in a communication system
AssigneeSamsung Electronics Co., Ltd.
InventorsAris PAPASAKELLARIOU, Hyoung-Ju Ji, Jin-Kyu Han
Life of this patent
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Abstract
A method for a user equipment (UE) to determine locations for M candidate physical downlink control channels (PDCCHs) in a set of N physical resource blocks (PRBs) in a transmission time interval (TTI) is provided. The method includes determining a location for each of M candidate PDCCHs in a different PRB if N is greater than or equal to M and determining a location for each of N candidate PDCCHs in a different PRB and determining a location for each of remaining M-N candidate PDCCHs in a different PRB if M is greater than N and 2N is greater than or equal to M.
Claims20
A method for receiving downlink control information (DCI) by a user equipment (UE), the method comprising:
- receiving higher layer signaling which informs a set of physical resource blocks (PRBs);
- determining control channel elements (CCE) indexes for physical downlink control channel (PDCCH) candidates by using a CCE aggregation level, a number of CCEs, and a number of the PDCCH candidates, such that locations for the PDCCH candidates are distributed over the set of PRBs;
- receiving a DCI format by detecting the PDCCH candidates, the DCI format including an information element indicating that a first downlink resource is discarded from receiving a physical downlink shared channel (PDSCH);
- and
- receiving the PDSCH based on the information element.
A user equipment (UE) apparatus for receiving downlink control information (DCI), the apparatus comprising:
- a receiver configured to receive higher layer signaling which informs a set of physical resource blocks (PRBs);
- and
- a searcher configured to determine control channel elements (CCE) indexes for physical downlink control channel (PDCCH) candidates by using a CCE aggregation level, a number of CCEs, and a number of the PDCCH candidates, such that locations for the PDCCH candidates are distributed over the set of PRBs,
- wherein the receiver is further configured to receive a DCI format by detecting the PDCCH candidates, the DCI format including an information element indicating that a first downlink resource is discarded from receiving a physical downlink shared channel (PDSCH), and receive the PDSCH based on the information element.
A method for transmitting downlink control information (DCI) by a base station, the method comprising:
- transmitting higher layer signaling which informs a set of physical resource blocks (PRBs);
- determining control channel elements (CCE) indexes for physical downlink control channel (PDCCH) candidates by using a CCE aggregation level, a number of CCEs, and a number of the PDCCH candidates, such that locations for the PDCCH candidates are distributed over the set of PRBs;
- and
- transmitting a DCI format, the DCI format including an information element indicating that a first downlink resource is discarded from receiving a physical downlink shared channel (PDSCH);
- and
- transmitting the PDSCH based on the information element.
A base station apparatus for transmitting downlink control information (DCI), the apparatus comprising:
- a transmitter configured to transmit higher layer signaling which informs a set of physical resource blocks (PRBs);
- and
- a selector configured to determine control channel elements (CCE) indexes for physical downlink control channel (PDCCH) candidates by using a CCE aggregation level, a number of CCEs, and a number of the PDCCH candidates, such that locations for the PDCCH candidates are distributed over the set of PRBs,
- wherein the transmitter is further configured to transmit a DCI format, the DCI format including an information element indicating that a first downlink resource is discarded from receiving a physical downlink shared channel (PDSCH) and transmit the PDSCH based on the information element.
Dependencies are inferred from the claim text.