Control signaling in LTE carrier aggregation
Methods and devices may be provided for aggregating component carriers in the licensed spectrum with at least one component carriers in the licensed exempt spectrum. Control information may be processed in a wireless transmit/receive unit (WTRU) while receiving and sending information on a primary component carrier (PCC) and a supplementary component carrier (SuppCC). A PCC subframe with a control portion and a data portion may be received. Resource assignment information associated with a downlink shared channel on the PCC may be embedded in the control portion of the subframe. Based on the resource assignment information on the PCC, resource assignment information associated with a downlink shared channel on the SuppCC may be identified in the data portion of the PCC subframe. A SuppCC subframe of the shared channel on the SuppCC may be processed as per the identified resource assignment information associated with the downlink shared channel on the SuppCC.
1. A wireless transmit receive unit (WTRU) configured to process control information when receiving information on a primary component carrier (PCC) and a supplementary component carrier (SuppCC), the WTRU comprising:
a processor configured to:
receive a first PCC subframe, the first PCC subframe comprising a control portion and a data portion, the control portion comprising resource assignment information associated with a downlink shared channel on the PCC;
identify in the data portion of the first PCC subframe, second resource assignment information associated with a downlink shared channel on the SuppCC, wherein the SuppCC is a time division duplex (TDD) component carrier having a subset of SuppCC subframes allocated for the WTRU to receive information; and
process a first SuppCC subframe of the downlink shared channel on the SuppCC in accordance with the identified second resource assignment information associated with the downlink shared channel on the SuppCC, wherein the first SuppCC subframe is subsequent to the first PCC subframe, and wherein the first SuppCC subframe is in the subset of SuppCC subframes.
2. The WTRU of claim 1 , the processor is further configured to:
receive a second PCC subframe, the second PCC subframe comprising a control portion and a data portion, the control portion comprising third resource assignment information associated with the downlink shared channel on the PCC;
identify, in the data portion of the second PCC subframe, fourth resource assignment information associated with an uplink shared channel on the SuppCC; and
send information in, a second SuppCC subframe of the uplink shared channel on the SuppCC in accordance with the identified fourth resource assignment information associated with the uplink shared channel on the SuppCC, wherein the second SuppCC subframe is subsequent to the second PCC subframe.
3. The WTRU of claim 2 , wherein the fourth resource assignment information associated with the uplink shared channel on the SuppCC comprises an uplink grant associated with the second SuppCC subframe of the uplink shared channel on the SuppCC.
4. The WTRU of claim 2 , wherein the second SuppCC subframe is an uplink subframe.
5. The WTRU of claim 1 , wherein the first SuppCC subframe immediately follows the first PCC subframe carrying the second resource assignment information.
6. A method for processing control information when receiving information on a primary component carrier (PCC) and a supplementary component carrier (SuppCC), the method comprising:
receiving a first PCC subframe, the first PCC subframe comprising a control portion and a data portion, the control portion comprising first resource assignment information associated with a downlink shared channel on the PCC;
identifying, in the data portion of the first PCC subframe, second resource assignment information associated with a downlink shared channel on the SuppCC, wherein the SuppCC is a time division duplex (TDD) component carrier having a subset of SuppCC subframes allocated for the WTRU to receive information; and
processing, a first SuppCC subframe of the downlink shared channel on the SuppCC in accordance with the identified second resource assignment information associated with the downlink shared channel on the SuppCC, wherein the first SuppCC subframe is subsequent to the first PCC subframe, and wherein the first SuppCC subframe is in the subset of SuppCC subframes.
7. The method of claim 1 , further comprising
receiving a second PCC subframe, the second PCC subframe comprising a control portion and a data portion, the control portion comprising third resource assignment information associated with the downlink shared channel on the PCC;
identifying, in the data portion of the second PCC subframe, fourth resource assignment information associated with an uplink shared channel on the SuppCC; and
sending information in, a second SuppCC subframe of the uplink shared channel on the SuppCC in accordance with the identified fourth resource assignment information associated with the uplink shared channel on the SuppCC, wherein the second SuppCC subframe is subsequent to the second PCC subframe.
8. The method of claim 7 , wherein the fourth resource assignment information associated with the uplink shared channel on the SuppCC comprises an uplink grant associated with the second SuppCC subframe.
9. The method of claim 7 , wherein the second SuppCC subframe is an uplink subframe.
10. The method of claim 6 , wherein the first SuppCC subframe immediately follows the first PCC subframe carrying the second resource assignment information.