Radio resource assignment in control channel in wireless communication systems
A method in a wireless communication device including receiving ( 410 ) a composite control channel including at least two control channel elements, each control channel element only contains radio resource assignment information, for example, a codeword, exclusively addressed to a single wireless communication entity. The device combines ( 420 ) at least two of the control channel elements, and decodes ( 430 ) the combined control channel elements.
1. A method in a wireless communication device, the method comprising:
receiving a plurality of control channel elements, at the wireless communication device, in a composite control channel portion of a radio frame and in a common transmit time interval;
attempting to decode a single control channel element of the plurality of control channel elements;
determining whether the attempting to decode the single control channel element is successful;
combining at least two of the plurality of control channel elements; and
attempting to decode the combined control channel elements if the attempting to decode the single control channel element is not successful.
2. The method of claim 1 wherein the combining at least two of the plurality of control channel elements comprises combining the single control channel element with one other control channel element, wherein the single control channel element and the one other control channel element constitute the combined control channel elements.
3. The method of claim 2 , wherein the single control channel element comprises a first set of subcarriers and the one other control channel element comprises a second set of subcarriers.
4. The method of claim 2 further comprising
determining whether the attempting to decode the combined control channel elements is successful,
combining the single control channel element with two other control channel elements if the attempting to decode the single control channel element combined with the one other control channel element is not successful, and
attempting to decode the single control channel element combined with the two other control channel elements.
5. The method of claim 1 further comprising obtaining radio resource assignment information from the combined control channel elements if the attempting to decode the combined control channel elements is successful.
6. The method of claim 1 further comprising
determining whether the attempting to decode the combined control channel elements is successful,
attempting to decode two other control channel elements if the attempting to decode the combined control channel elements is not successful.
7. The method of claim 1 , wherein the determining whether the attempting to decode the single control channel element is successful includes performing a cyclic redundancy check on the single control channel element after decoding.
8. A method in a wireless communication device, the method comprising:
attempting to decode at least two combined control channel elements received at the wireless communication device in a composite control channel portion of a radio frame and in a common transmission time interval;
determining whether the attempting to decode the at least two combined control channel elements is successful;
attempting to decode a single one of the at least two combined control channel elements if the attempting to decode the at least two combined control channel elements is not successful.
9. The method of claim 8 further comprising obtaining radio resource assignment information from the single one of the at least two combined control channel elements if the attempt to decode the single one of the at least two combined control channel elements is successful.
10. The method of claim 8 , wherein the determining whether the attempting to decode the at least two combined control channel elements is successful includes performing a cyclic redundancy check on the at least two combined control channel elements after decoding.
11. A wireless communication device comprising a receiver coupled to a controller, wherein the controller is configured to:
attempt to decode at least two combined control channel elements received at the wireless communication device in a composite control channel portion of a radio frame and in a common transmission time interval; and
attempt to decode a single one of the at least two control channel elements if the attempt to decode the at least two combined control channel elements is not successful.
12. The device of claim 11 , wherein the controller is further configured to obtain radio resource assignment information from the single one of the at least two combined control channel elements if the attempt to decode the single one of the at least two combined control channel elements is successful.
13. The device of claim 11 wherein the controller is configured to determine whether the attempt to decode the at least two combined control channel elements is successful by performing a cyclic redundancy check on the at least two combined control channel elements after decoding.