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US 11,153,863 B2Granted
Physical downlink control channel (PDCCH) demodulation reference signal (DMRS) transmission and reception
AssigneeApple Inc.
InventorsHonglei Miao, Wook Bong Lee, Yushu Zhang, Michael Faerber, Seunghee Han
Life of this patent
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Abstract
Embodiments of the present disclosure describe methods and apparatuses for physical downlink control channel (PD-CCH) demodulation reference signal (DMRS) transmission and reception.
Claims23
One or more non-transitory, computer-readable media having instructions that, when executed by one or more processors, cause a base station to:
- embed a first even number of demodulation reference signals (DMRSs) in a corresponding first even number of resource elements (REs) in a first resource level of a pair of resource levels of a physical downlink control channel (PDCCH), wherein the first even number of DMRSs are associated with a first antenna pair;
- embed a second even number of DMRSs in a corresponding second even number of REs in a second resource level of the pair of resource levels of the PDCCH, wherein the second even number of DMRSs are associated with a second antenna pair;
- apply, to the first resource level and the second resource level, a transmit diversity scheme;
- and
- identify, for transmission from the first antenna pair, the first resource level, and, for transmission from the second antenna pair, the second resource level, wherein the instructions, when executed, further cause the base station to:
- number sequentially the first resource level and the second resource level, wherein the first resource level has an even number and the second resource level has an odd number;
- identify, for transmission by the first antenna pair, the first resource level, based on the even number;
- and
- identify, for transmission from the second antenna pair, the second resource level, based on the odd number.
6 more elements
A base station, comprising:
- memory to store transmit diversity scheme information;
- and
- processor circuitry, coupled with the memory, to:
- embed a first even number of demodulation reference signals (DMRSs) in a corresponding first even number of resource elements (REs) in a first resource level of a pair of resource levels of a physical downlink control channel PDCCH, wherein the first even number of DMRSs are associated with a first antenna pair;
- embed a second even number of DMRSs in a corresponding second even number of REs in a second resource level of the pair of resource levels of the PDCCH, wherein the second even number of DMRSs are associated with a second antenna pair;
- apply, to the first resource level and the second resource level, a transmit diversity scheme based on the transmit diversity scheme information;
- and
- identify, for transmission from the first antenna pair, the first resource level and, for transmission from the second antenna pair, the second resource level, wherein the processor circuitry is further configured to:
- number sequentially the first resource level and the second resource level, wherein the first resource level has an even number and the second resource level has an odd number;
- identify, for transmission by the first antenna pair, the first resource level, based on the even number;
- and
- identify, for transmission from the second antenna pair, the second resource level, based on the odd number.
9 more elements
One or more non-transitory, computer-readable media having instructions that, when executed by one or more processors, cause a user equipment (UE) to:
- derive, based on physical downlink control channel (PDCCH) demodulation reference signal (DMRS) information of the UE, a DMRS sequence of a PDCCH of the UE, wherein one or more control channel resource blocks include the PDCCH of the UE;
- determine, based on PDCCH DMRS information of one or more multi-user multiple-input multiple-output (MU-MIMO) UEs, DMRS sequences of MU-MIMO PDCCHs of the one or more MU-MIMO UEs, wherein the one or more control channel resource blocks include the MU-MIMO PDCCHs;
- estimate, based on the DMRS sequences of the MU-MIMO PDCCHs, channels for the MU-MIMO PDCCHs;
- estimate, based on the channels for the one or more MU-MIMO PDCCHs, one or more channel powers of the MU-MIMO PDCCHs;
- determine whether a channel power of the one or more channel powers exceeds a threshold;
- and
- suppress, if the channel power exceeds the threshold, MU-MIMO PDCCH interference, wherein the instructions, when executed, further cause the UE to:
- estimate a soft symbol of the PDCCH of the UE;
- and
- estimate a soft symbol of the MU-MIMO PDCCH interference, to generate an estimated MU-MIMO PDCCH symbol.
7 more elements
A user equipment (UE), comprising:
- memory to store physical downlink control channel (PDCCH) demodulation reference signal (DMRS) information;
- and
- processor circuitry, coupled with the memory, to:
- derive, based on the PDCCH DMRS information, a DMRS sequence of a PDCCH of the UE, wherein one or more control channel resource blocks include the PDCCH;
- determine, based on PDCCH DMRS information of a multi-user multiple-input (MU-MIMO) UE, a DMRS sequence of MU-MIMO PDCCH of the MU-MIMO UE, wherein the one or more control channel resource blocks include the MU-MIMO PDCCH;
- estimate, based on the DMRS sequence of the MU-MIMO PDCCH of the MU-MIMO UE, a channel for the MU-MIMO PDCCH;
- estimate, based on the channel for the MU-MIMO PDCCH, a channel power of the MU-MIMO PDCCH;
- determine whether the channel power exceeds a threshold;
- and
- suppress, if the channel power exceeds the threshold, MU-MIMO PDCCH interference, wherein the processor circuitry is further configured to:
- estimate a soft symbol of the PDCCH of the UE;
- and
- estimate a soft symbol of the MU-MIMO PDCCH interference, to generate an estimated MU-MIMO PDCCH symbol.
10 more elements
Dependencies are inferred from the claim text.