Telecom Techniques Guide


Different Categories of UE in LTE

Categories of UE in LTE is divided by its function which is as per below.

eNB obtains the UE radio capabilities via:
• The S1AP initial setup request message
• The X2AP in case of handover
• The RRC in any other cases

eNB sends the UE radio capabilities to:
• The MME if it has been retrieved from RRC signaling
• The neighbor eNB in case of handover

UE category determines:
• MIMO settings
• PRB allocation and AMC limitation (e.g. 64QAM in UL)
• ROHC (Robust Header Compression) profile
• Inter RAT handover support

• All categories support 20 MHz
• 64QAM mandatory in downlink, but not in uplink (except Class 5)
• 2×2 MIMO mandatory in other classes except Class 1