Method of reference signaling resource allocation for control channel transmission in wireless communication system
First Claim
1. A method for monitoring a control channel by a user equipment in a wireless communication system, the method comprising:
- receiving configuration information on the control channel from a base station;
identifying a subframe in which the user equipment monitors the control channel based on the configuration information;
determining a demodulation reference signal (DMRS) port index for monitoring the control channel depending on an aggregation level of the control channel; and
monitoring the control channel in the subframe using the determined the DMRS port index,wherein at least two DMRS port indices are used for monitoring the control channel if the aggregation level of the control channel is 2.
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Abstract
In legacy systems such as 3rd Generation Partnership Project (3GPP) releases 8 to 10, the control channel is transmitted using the first few Orthogonal Frequency Division Multiplexing (OFDM) symbols in a subframe. The limited control channel capacity will impact the system performance in future releases as more and more User Equipments (UEs) will be scheduled in a subframe with technologies such as MulitUser-Multiple Input Multiple Output (MU-MIMO) and Coordinated Multipoint (CoMP) transmission being enhanced or introduced. A new Enhanced Control CHannel (E-CCH) is necessary to be designed, which will use the resource in the Physical Downlink Shared CHannel (PDSCH) in the legacy systems. The E-CCH will support UE-specific DeModulation Reference Signal (DMRS) based transmission and receiving. However, the configuration of DMRS for E-CCH is necessary to be known to UE in prior. This invention discloses multiple methods in which DMRS is configured for E-CCHs and respective eNB and UE behaviors.
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Citations
24 Claims
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1. A method for monitoring a control channel by a user equipment in a wireless communication system, the method comprising:
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receiving configuration information on the control channel from a base station; identifying a subframe in which the user equipment monitors the control channel based on the configuration information; determining a demodulation reference signal (DMRS) port index for monitoring the control channel depending on an aggregation level of the control channel; and monitoring the control channel in the subframe using the determined the DMRS port index, wherein at least two DMRS port indices are used for monitoring the control channel if the aggregation level of the control channel is 2. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A user equipment for monitoring a control channel from a base station in a wireless communication system, the user equipment comprising:
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a communication unit configured to transmit or receive a signal to or from the base station; and a control unit configured to; receive configuration information on the control channel from the base station, identify a subframe in which the user equipment monitors the control channel based on the configuration information, determine a demodulation reference signal (DMRS) port index for monitoring the control channel depending on an identified aggregation level of the control channel, and monitor the control channel in the subframe using the determined the DMRS port index, wherein at least two DMRS port indices are used for monitoring the control channel if the aggregation level is 2. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for transmitting a control channel by a base station in a wireless communication system, the method comprising:
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transmitting configuration information including information associated with a subframe in which a user equipment (UE) monitors the control channel to the UE; and transmitting the control channel in the subframe to the UE, the control channel being associated with a demodulation reference signal (DMRS) port index depending on an aggregation level of the control channel, wherein at least two DMRS port indices are used for monitoring the control channel if the aggregation level is 2. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A base station for transmitting a control channel in a wireless communication system, the base station comprising:
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a communication unit configured to transmit or receive a signal to or from user equipment; and a control unit configured to; transmit configuration information including information associated with a subframe in which a user equipment (UE) monitors the control channel to the UE, and transmit the control channel in the subframe, being associated with a demodulation reference signal (DMRS) port index depending on an identified aggregation level of the control channel, to the UE, wherein at least two DMRS port indices are used for monitoring the control channel if the aggregation level is 2. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification