Physical Downlink Control Channel Design for NR Systems
First Claim
1. A method comprising:
- receiving a control signal from a base station by a user equipment (UE) to determine a set of received physical resource blocks (PRBs) and a set of OFDM symbols that carry downlink control information;
determining a set of candidate physical downlink control channels (PDCCHs) within the set of PRBs, wherein each PDCCH is associated with a set of control channel elements (CCEs) for PDCCH transmission;
collecting a plurality of resource element groups (REGs) for each CCE, wherein each CCE comprises a number of REGs based on an REG-to-CCE mapping, and wherein each REG is indexed by a frequency first or by a time first REG indexing manner; and
decoding the downlink control information that are mapped to the collected REGs.
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Abstract
A new design for physical downlink control channel (PDCCH) is proposed for the next generation 5G new radio systems. A UE receives the configuration of a default control resource set (CORESET) in MIB/SIB from its serving base station. The default CORESET contains both common search space and UE-specific search space for candidate PDCCH transmission. A PDCCH in a default CORESET is mapped to physical resource in a distributed or localized manner. Specifically, various REG-to-CCE mapping rules are proposed to improve frequency diversity gain, or frequency selectivity gain, or to reduce latency of PDCCH processing. Further, to facilitate analog beamforming in mmWave systems, the default CORESET is transmitted in a synchronization signal (SS) block associated with a corresponding analog beam direction.
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Citations
24 Claims
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1. A method comprising:
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receiving a control signal from a base station by a user equipment (UE) to determine a set of received physical resource blocks (PRBs) and a set of OFDM symbols that carry downlink control information; determining a set of candidate physical downlink control channels (PDCCHs) within the set of PRBs, wherein each PDCCH is associated with a set of control channel elements (CCEs) for PDCCH transmission; collecting a plurality of resource element groups (REGs) for each CCE, wherein each CCE comprises a number of REGs based on an REG-to-CCE mapping, and wherein each REG is indexed by a frequency first or by a time first REG indexing manner; and decoding the downlink control information that are mapped to the collected REGs. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A user equipment (UE), comprising:
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a radio frequency (RF) receiver that receives a control signal from a base station by to determine a set of received physical resource blocks (PRBs) and a set of OFDM symbols that carry downlink control information; a control circuit that determines a set of candidate physical downlink control channels (PDCCHs) within the set of PRBs, wherein each PDCCH is associated with a set of control channel elements (CCEs) for PDCCH transmission; a collection circuit that collects a plurality of resource element groups (REGs) for each CCE, wherein each CCE comprises a number of REGs based on an REG-to-CCE mapping, and wherein each REG is indexed by a frequency first or by a time first REG indexing manner; and a decoder that decodes the downlink control information that are mapped to the collected REGs. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method comprising:
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receiving one or more synchronization signal blocks (SS Blocks) from a base station by a user equipment (UE), wherein each SS block is associated with a corresponding analog beam direction; obtaining a default control resource set (CORESET) in an SS block and determining a corresponding UE-favored analog beam direction, wherein the default CORESET comprises a set of physical resource blocks (PRBs), a set of OFDM symbols, a numerology, a periodicity, and reference signal (RS) configuration; obtaining a physical random-access channel (PRACH) resource associated with the default CORESET; and performing an access procedure over the obtained PRACH resource. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A user equipment (UE) comprising:
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a radio frequency (RF) receiver that receives one or more synchronization signal blocks (SS Blocks) from a base station, wherein each SS block is associated with a corresponding analog beam direction; a control circuit that obtains a default control resource set (CORESET) in an SS block and determining a corresponding UE-favored analog beam direction, wherein the default CORESET comprises a set of physical resource blocks (PRBs), a set of OFDM symbols, a numerology, a periodicity, and reference signal (RS) configuration; and a channel access handling circuit that obtains a physical random-access channel (PRACH) resource associated with the default CORESET and performs an access procedure over the obtained PRACH resource. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification