Carrier Aggregation Interview Question Answer 9-15

Q09 How network identified that UE is support C.A?

Ans. At a time of initial registaration ue send UECapabilityInformation to enb behalf of that a network knows the capabilities of ue.
If network required ue capability then it send UECapabilityEnquiry to ue and receive UECapabilityInformation against them.

UECapabilityEnquiry:

• Signalling radio bearer: SRB1
• RLC-SAP: AM
• Logical channel: DCCH
• Direction: E-UTRAN to UE

UECapabilityInformation

• Signalling radio bearer: SRB1
• RLC-SAP: AM
• Logical channel: DCCH
• Direction: UE to E-UTRAN

Reference:
TS 36.306 and TS 36.331-6.2.2 UECapabilityEnquiry , UECapabilityInformation

Q10. How UE identified that network is support C.A?

Ans. When UE sent UECapabilityInformation information to primary cell, PCell aware the ue capabilities, behalf of that PCell add the secondary cell as per UE radio conditions or ue-CapabilityRAT-ContainerList.

Q11. How many Component Carrier possible in release-10?

Ans. 1 PCC and 4 SCC. Toatal 5 component carrier can be possible in release-10.

Q12. How many Component Carrier possible in release-13?

Ans. The Release 13 is to expand LTE CA up to 32 CCs and hence provide a major leap in the achievable data rates for LTE as well as in the flexibility to aggregate large numbers of carriers in different bands.

Q13. How many supportive Bands are available in CA?

Ans. 

Q14. How many types of supportive bandwidth class is available in CA?

Ans. CA bandwidth class: indicates a combination of maximum ATBC and maximum number of CCs. In R10 and R11 three classes are defined:
Aggregated Transmission Bandwidth Configuration (ATBC): total number of aggregated physical resource blocks (PRB).

• Class A: ATBC ≤ 100, maximum number of CC = 1
• Class B: ATBC ≤ 100, maximum number of CC = 2
• Class C: 100 < ATBC ≤ 200, maximum number of CC = 2

CA configuration: indicates a combination of E-UTRA operating band(s) and CA bandwidth class(es), to exemplify the configuration CA_1C indicates intra-band contiguous CA on E-UTRA operating band 1 and CA bandwidth class C, CA_1A_1A, indicates intra-band non-contiguous CA on band 1 with a one CC on each side of the intra-band gap, finally CA_1A-5B indicates inter-band CA, on operating band 1 with bandwidth class A and operating band 5 with bandwidth class B.

Q15. How many Combinations of Bands and Classes are possible in CA?

Ans.