Uplink grant, downlink assignment and search space method and apparatus in carrier aggregation

摘要

Methods of mapping, indicating, encoding and transmitting uplink (UL) grants and downlink (DL) assignments for wireless communications for carrier aggregation are disclosed. Methods to encode and transmit DL assignments and UL grants and map and indicate the DL assignments to DL component carriers and UL grants to UL component carriers are described. Methods include specifying the mapping rules for DL component carriers that transmit DL assignment and DL component carriers that receive physical downlink shared channel (PDSCH), and mapping rules for DL component carriers that transmit UL grants and UL component carriers that transit physical uplink shared channel (PUSCH) when using separate coding/separate transmission schemes.

主权项

1. A method performed by a wireless transmit receive unit (WTRU) for decoding information related to cross-carrier scheduling, the method comprising:
monitoring at least one WTRU-specific search space including a first plurality of control channel elements (CCEs) on a first component carrier for a set of physical downlink control channel (PDCCH) candidates, wherein the at least one WTRU-specific search space has a first set of CCE numbers of the first plurality of CCEs associated with the first component carrier and a second set of CCE numbers of the first plurality of CCEs associated with a second component carrier; decoding a first PDCCH candidate and a second PDCCH candidate received via the first component carrier, wherein the first PDCCH candidate and the second PDCCH candidate are associated with a predetermined identifier of the WTRU, and wherein the first PDCCH candidate is detected on at least a first CCE of the first plurality of CCEs and the second PDCCH candidate is detected on at least a second CCE of the first plurality of CCEs; and receiving a first PDSCH via the first component carrier and receiving a second PDSCH via a second component carrier, wherein the second component carrier corresponds to the second PDCCH candidate, and wherein the second PDSCH is received without monitoring a PDCCH on the second component carrier.