Resource mapping method and apparatus of OFDM system
A method and apparatus for allocating resource between uplink ACK/NACK channel and downlink control channel supporting spatial multiplexing in an OFDM-based wireless communication system which configures uplink ACK/NAK channel implicitly using reference signals for discriminating among resource allocation spaces and physical channel resource. The method is capable of multiplexing the uplink ACK/NACK channel associated with the control channel extended by spatial multiplexing into the uplink ACK/NACK channel resource which does not support spatial multiplexing.
1. A resource mapping method of a transmitter, comprising:
allocating, in a dedicated control channel region, dedicated control resources
mapping the allocated dedicated control resources into a data channel region; and
transmitting the allocated dedicated control resources as mapped in the data channel region,
wherein the dedicated control resources are used for allocating an uplink response resource according to resource indices and Dedicated Reference Signal (DRS) port indices.
2. The resource mapping method of claim 1 , wherein allocating dedicated control resources comprises:
assigning, when the resource indices are identical with each other and the DRS port indices are different from each other, the dedicated control resources to the same Physical Resource Block (PRB);
assigning, when the resource indices are different from each other and the DRS port indices are identical with each other, the dedicated control resources to different PRBs; and
assigning the dedicated control resources to an entire bandwidth of the data channel region or at least one PRB in the entire bandwidth.
3. The resource mapping method of claim 1 , wherein allocating dedicated control resources comprises:
determining a start point of the dedicated control resources in the dedicated control channel region; and
assigning the dedicated control resources from the start point in the dedicated control channel region.
4. The resource mapping method of claim 3 , wherein assigning the dedicated control resources comprises at least one of:
assigning the dedicated control resources in ascending order of the DRS port index, the resource index increasing per DRS port index;
assigning the dedicated control resources in ascending order of the DRS port index, the DRS index increasing per the resource index; and
assigning the dedicated control resources by multiplexing the DRS port indices per resource index.
5. The resource mapping method of claim 1 , wherein the DRS port indices are discriminated by scrambling codes.
6. A resource utilization method of a receiver, comprising:
receiving control information in a dedicated control channel region of a data channel region;
demodulating data received in the data channel region by analyzing the control information;
determining a response resource using dedicated control resources, in the dedicated control channel region, allocated according to resource indices and Dedicated Reference Signal (DRS) port indices; and
transmitting a demodulation result of the data using the response resource.
7. The resource utilization method of claim 6 , wherein the dedicated control resources are assigned to a same Physical Resource Block (PRB) when the resource indices are identical with each other and the DRS port indices are different from each other, and assigned to different PRBs when the resource indices are different from each other and the DRS port indices are identical with each other, and to entire bandwidth of the data channel region or at least one PRB in the entire bandwidth.
8. A resource mapping apparatus of a transmitter, comprising:
Dedicated Reference Signal (DRS) ports corresponding to respective DRS port indices;
a controller which allocates, in a dedicated control channel region, dedicated control resources and maps the allocated dedicated control resources into a data channel region; and
a multiplexer which transmits the allocated dedicated control resources as mapped in a data channel region,
wherein the dedicated control resources are used for allocating uplink response resource according to resource indices and the DRS port indices.
9. The resource mapping apparatus of claim 8 , wherein the controller assigns the dedicated control resources to a same Physical Resource Block (PRB) when the resource indices are identical with each other and the DRS port indices are different from each other, and assigns to different PRBs when the resource indices are different from each other and the DRS port indices are identical with each other, and to entire bandwidth of the data channel region or at least one PRB in the entire bandwidth.
10. The resource mapping apparatus of claim 8 , wherein the controller determines a start point of the dedicated control resources in the dedicated control channel region and assigns the dedicated control resources from the start point in the dedicated control channel region.
11. The resource mapping apparatus of claim 10 , wherein the controller assigns the dedicated control resources in ascending order of the DRS port index with the resource index increasing per DRS port index, and assigns the dedicated control resources in ascending order of the DRS port index which increases per the resource index, or assigns the dedicated control resources by multiplexing the DRS port indices per resource index.
12. The resource mapping apparatus of claim 9 , wherein the DRS port indices are discriminated by scrambling codes.
13. A resource utilization apparatus of a receiver, comprising:
a receiving processor which receives control information in a dedicated control channel region of a data channel region;
a demodulator which demodulates data received in the data channel region by analyzing the control information;
a resource selector which determines a response resource using dedicated control resources, in the dedicated control channel region, assigned according to indices of a resource and Dedicated Reference Signal (DRS) port indices; and
a controller which controls to transmit a demodulation result of the data using the response resource.
14. The resource utilization apparatus of claim 13 , wherein the dedicated control resources are assigned to a same Physical Resource Block (PRB) when the resource indices are identical with each other and the DRS port indices are different from each other, and assigned to different PRBs when the resource indices are different from each other and the DRS port indices are identical with each other, and to entire bandwidth of the data channel region or at least one PRB in the entire bandwidth.