Patent ID: 9750053
Date: 2017-08-29
CPC Classifications: H04L,H04W

Claim:
1. A method performed by an evolved NodeB (eNodeB), the method comprising: transmitting a physical downlink control channel (PDCCH) order for a random access procedure, wherein the PDCCH order includes a carrier indicator field (CIF) indicating a component carrier, selected from a plurality of component carriers, via which a wireless transmit/receive unit (WTRU) is to transmit a random access preamble, wherein the component carrier indicated by the CIF is a member of a group of component carriers of the plurality of component carriers, and further wherein the group of component carriers have a same timing alignment (TA); receiving the random access preamble on the component carrier indicated by the CIF in response to the PDCCH order; transmitting a random access response (RAR) on a primary downlink component carrier in response to the random access preamble, wherein the RAR includes a timing advance used to adjust uplink transmission timing via any component carrier of the group of component carriers.