Method and apparatus for data transmission on control channels from base station to user equipments in wireless communication system
A method for data transmission on control channels from a Base Station (BS) to a User Equipment (UE) in a wireless communication system is disclosed. The method includes multiplexing a common control channel and a UE-specific control channel for the UE using at least one of time division multiplexing and frequency division multiplexing; and performing data transmission on the multiplexed common control channel and the UE-specific control channel to the UE. The UE-specific control channel is multiplexed with one or more UE-specific control channels for other UEs using at least one of time division multiplexing, frequency division multiplexing, spatial multiplexing, and code division multiplexing.
1. A method for data transmission on control channels from a Base Station (BS) to a User Equipment (UE) in a wireless communication system, the method comprising:
multiplexing a common control channel and a UE-specific control channel for the UE using at least one of time division multiplexing and frequency division multiplexing,
wherein the common control channel and the UE-specific control channel are code-division-multiplexed or spatial-multiplexed on the same time-frequency resources; and
performing data transmission on the multiplexed common control channel and the UE-specific control channel to the UE,
wherein a Reference Signal (RS) configuration for estimating the common control channel is equal to an RS configuration for estimating the UE-specific control channel, and
wherein the UE-specific control channel is multiplexed with one or more UE-specific control channels for other UEs using at least one of time division multiplexing, frequency division multiplexing, spatial multiplexing, and code division multiplexing.
2. The method according to claim 1 , further comprising applying a precoder for beamforming to the common control channel and the UE-specific control channel,
wherein the precoder for beamforming uses an identity matrix.
3. A Base Station (BS) apparatus in a wireless communication system, the BS apparatus comprising:
a wireless communication module configured to transmit signals to and receive signals from a User Equipment (UE); and
a processor configured to control the wireless communication module;
wherein the processor is further configured to:
multiplex a common control channel and a UE-specific control channel for the UE using at least one of time division multiplexing and frequency division multiplexing,
wherein the common control channel and the UE-specific control channel are code-division-multiplexed or spatial-multiplexed on the same time-frequency resources, and
control the wireless communication module to perform data transmission on the multiplexed common control channel and the UE-specific control channel to the UE,
wherein a Reference Signal (RS) configuration for estimating the common control channel is equal to an RS configuration for estimating the UE-specific control channel, and
wherein the processor multiplexes the UE-specific control channel with one or more UE-specific control channels for other UEs using at least one of time division multiplexing, frequency division multiplexing, spatial multiplexing, and code division multiplexing.
4. The BS apparatus according to claim 3 , wherein the processor applies a precoder for beamforming to the common control channel and
the UE-specific control channel, and wherein the precoder for beamforming uses an identity matrix.