Method for allocating resources to uplink control channel
A method for adaptively allocating resources of an uplink control channel according to a system situation is disclosed. If a base station (BS) recognizes the system situation, establishes control information for resource allocation, and transmits the control information to a mobile station (MS), the mobile station (MS) allocates resources for transmitting uplink control information using a specific block or a specific resource distribution method according to the corresponding control information. The system situation may be changed according to the number of users contained in the BS's coverage or the usage of a multi-antenna. The variation of the system situation is actively reflected so that the uplink channel resources can be effectively used.
1. A method for transmitting uplink control information at a mobile station (MS) in a mobile communication system, the method comprising:
mapping reference signals (RSs) at two or more time domain units, separated from each other in time domain, within one transmission time interval (TTI) of a 2-dimensional time-frequency resource grid;
multiplexing the uplink control information with uplink data based on one or more of time divisional multiplexing (TDM) or frequency divisional multiplexing (FDM) by mapping the uplink control information and the uplink data to the 2-dimensional time-frequency resource grid,
wherein the uplink control information comprises one or more of an ACK/NACK and a CQI, and
wherein the one or more of the ACK/NACK and the CQI are mapped at each of time domain units respectively adherent to each of the two or more time domain units in which the RSs are mapped within the one TTI; and
transmitting the RSs, the uplink control information and the uplink data mapped to the 2-dimensional time-frequency resource grid to a base station.
2. The method of claim 1 , wherein the RSs comprises a first type RS for data demodulation.
3. The method of claim 1 , wherein the RSs comprises a second type RS is for channel quality measurement, and
wherein the second type RS is periodically transmitted.
4. The method of claim 3 , further comprising:
puncturing one time domain unit, among the time domain units where the uplink control information is mapped, if the second type RS and the uplink control information are to be simultaneously transmitted within a specific TTI.
5. A mobile station (MS) for transmitting uplink control information in a mobile communication system, the MS comprising:
a processor configured to:
map reference signals (RSs) at two or more time domain units, separated from each other in time domain, within one transmission time interval (TTI) of a 2-dimensional time-frequency resource grid, and
multiplex the uplink control information with uplink data based on one or more of time divisional multiplexing (TDM) or frequency divisional multiplexing (FDM) by mapping the uplink control information and the uplink data to the 2-dimensional time-frequency resource grid,
wherein the uplink control information comprises one or more of an ACK/NACK and a CQI, and
wherein the one or more of the ACK/NACK and the CQI are mapped at each of time domain units respectively adherent to each of the two or more time domain units in which the RSs are mapped within the one TTI; and
a transmitter configured to transmit the RSs, the uplink control information and the uplink data mapped to the 2-dimensional time-frequency resource grid to a base station.
6. The MS of claim 5 , wherein the RSs comprises a first type RS for data demodulation.
7. The MS of claim 5 , wherein the RSs comprises a second type RS is for channel quality measurement, and
wherein the second type RS is periodically transmitted.
8. The MS of claim 7 , wherein the processor further configured to puncture one time domain unit, among the time domain units where the uplink control information is mapped, if the second type RS and the uplink control information are to be simultaneously transmitted within a specific TTI.