Method and apparatus for control channel transmission and reception
First Claim
1. A method in a user equipment (UE) for receiving control information, the method comprising:
- monitoring control channel candidates using common reference signals (CRS) and monitoring enhanced control channel candidates using demodulation reference signals (DMRS) when the UE is configured in a first transmission mode for receiving a downlink shared traffic channel based on DMRS;
monitoring control channel candidates only using CRS when the UE is configured in a second transmission mode for receiving a downlink shared traffic channel based on CRS; and
receiving downlink control information (DCI) in a subframe in one of the monitored control channel candidates or enhanced control channel candidates in the subframe, wherein monitoring control channel candidates using CRS further comprises monitoring Physical Downlink Control Channel (PDCCH) candidates, wherein monitoring enhanced control channel candidates using DMRS further comprises monitoring Enhanced Physical Downlink Control Channel (EPDCCH) candidates, and wherein the downlink shared traffic channel is a Physical Downlink Shared Channel (PDSCH), and wherein monitoring the EPDCCH candidates comprises;
monitoring a set of EPDCCH candidates in the subframe;
monitoring a first subset of the set of EPDCCH candidates at a first set of aggregation levels in a first slot of the subframe; and
monitoring a second subset of the set of EPDCCH candidates at a second set of aggregation levels in a second slot of the subframe, wherein the second set of aggregation levels is different from the first set of aggregation levels.
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Accused Products
Abstract
A communication system is provided wherein a user equipment (UE) receives control information from a wireless network. The UE monitors control channel candidates using common reference signals (CRS) and monitors enhanced control channel candidates using demodulation reference signals (DMRS) when the UE is configured in a first transmission mode, such as transmission mode 9, for receiving a downlink shared traffic channel based on DMRS. The UE monitors control channel candidates only using CRS when the UE is configured in a second transmission mode, such as any of transmission modes 1-6, for receiving a downlink shared traffic channel based on CRS. The UE then receives downlink control information (DCI) in a subframe in one of the monitored control channel candidates or enhanced control channel candidates in the subframe.
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Citations
16 Claims
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1. A method in a user equipment (UE) for receiving control information, the method comprising:
- monitoring control channel candidates using common reference signals (CRS) and monitoring enhanced control channel candidates using demodulation reference signals (DMRS) when the UE is configured in a first transmission mode for receiving a downlink shared traffic channel based on DMRS;
monitoring control channel candidates only using CRS when the UE is configured in a second transmission mode for receiving a downlink shared traffic channel based on CRS; and
receiving downlink control information (DCI) in a subframe in one of the monitored control channel candidates or enhanced control channel candidates in the subframe, wherein monitoring control channel candidates using CRS further comprises monitoring Physical Downlink Control Channel (PDCCH) candidates, wherein monitoring enhanced control channel candidates using DMRS further comprises monitoring Enhanced Physical Downlink Control Channel (EPDCCH) candidates, and wherein the downlink shared traffic channel is a Physical Downlink Shared Channel (PDSCH), and wherein monitoring the EPDCCH candidates comprises;
monitoring a set of EPDCCH candidates in the subframe;
monitoring a first subset of the set of EPDCCH candidates at a first set of aggregation levels in a first slot of the subframe; and
monitoring a second subset of the set of EPDCCH candidates at a second set of aggregation levels in a second slot of the subframe, wherein the second set of aggregation levels is different from the first set of aggregation levels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- monitoring control channel candidates using common reference signals (CRS) and monitoring enhanced control channel candidates using demodulation reference signals (DMRS) when the UE is configured in a first transmission mode for receiving a downlink shared traffic channel based on DMRS;
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9. A user equipment capable of receiving control information, the user equipment comprising:
- a wireless transceiver; and
a signal processing unit coupled to the transceiver and that is configured to monitor control channel candidates using common reference signals (CRS) and monitor enhanced control channel candidates using demodulation reference signals (DMRS) when the UE is configured in a first transmission mode for receiving a downlink shared traffic channel based on DMRS, monitor control channel candidates only using CRS when the UE is configured in a second transmission mode for receiving a downlink shared traffic channel based on CRS, and receive downlink control information (DCI) in a subframe in one of the monitored control channel candidates or enhanced control channel candidates in the subframe, wherein the signal processing unit is configured to monitor control channel candidates using CRS by monitoring Physical Downlink Control Channel (PDCCH) candidates, wherein monitoring enhanced control channel candidates using DMRS further comprises monitoring Enhanced Physical Downlink Control Channel (EPDCCH) candidates, and wherein the downlink shared traffic channel is a Physical Downlink Shared Channel (PDSCH), and wherein the signal processing unit is configured to monitor the EPDCCH candidates by monitoring a set of EPDCCH candidates in the subframe, monitoring a first subset of the set of EPDCCH candidates at a first set of aggregation levels in a first slot of the subframe, and monitoring a second subset of the set of EPDCCH candidates at a second set of aggregation levels in a second slot of the subframe, wherein the second set of aggregation levels is different from the first set of aggregation levels. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
- a wireless transceiver; and
Specification