Can anyone explain about PDCCH order procedure in-detail?
Answers
PDCCH ( Physical downlink Control Channel ) :- This channel carries the control information about the data being transmitted on the current subframe and the information about the resources which UE need to use for the uplink data. That means it is mandatory for the UE to decode it successfully if it wants to send some data or receive something.
PDCCH carries a message called DCI ( Downlink Control Information ) which includes resource assignments for a UE or group of UE's. EnodeB can transmit many DCI's or PDCCH's in a subframe. Actually enodeB need to send a lot of parameters to the UE for its operation but there may be the cases that some information is not required for a particular UE.
For Example:- Some UE does not support MIMO ( Multiple Input Multiple Output ), so for that UE there is no need to send the MIMO related parameters because they will increase the signalling overhead.