Relay Node in LTE network acts as an eNodeB to UE and acts as an UE towards Donor eNodeB (DeNB). DeNB is invisible for UEs connecting through Relay node. Since RN is treated as eNodeB by an UE, it will perform RACH to access the cell.
Why do we need only contention free RACH in LAA cells?
DCI 0 has no ofRB and MCS values, using these we can find out an TB size then why there is an extra field which is TB size in DCI0. What is the usage of this field.