LTE UE Power on Interview Questions Answers 21-30

LTE UE Power on Interview Questions Answers

Q21. What is p-max in p-compensation?

Ans. The p-max is maximum RF output power of the UE, and its measure in dBm (decibels milliwatt)

Q22. What do you mean by cell priority in lte?

Ans. When our UE is switch on and a operator have multiple RAT available on a cell then our UE select a 1^st frequeny based on priority. For eg TDD have maximum priority than FDD

Priority	RAT technology
7	TDD
6	FDD
5	UTRA
4	GERAN

Note** above table is a example, only for understanding. Operators sets priority according their network radio conditions.

Q23. How many types of Priority available in lte?

Ans. In LTE there are total 8 [0-7]types of priorities define. Priority 0 is the lowest and priority 7 is the highest. All priority information present in SIB3 as Cell reselection information elements. And specification no. is 36.331 (3GPP TS of RRC Layer).

Q24. What is Suitable Cell and Acceptable Cell what is the difference between them?

Ans. When a UE is switch on it tries to camp on in a normal service, or a cell provide normal services to every UE is called suitable cell.

Acceptable cell's are restricted for normal services but allow emergency calls.

Q25. What is Barred Cell and Blacklisted Cell and difference between them ?

Ans. Barred cell services are barred for normal class users like AC 0-9. But are available for user who have AC 10-15. for eg AC-15 is for PLMN users only. In another term its called a user who have class 15 sim-card can utilize the services of barred cell (reserved cell).

        Blacklisted cell are those cell which are blacklist for a particular radio network, these blacklisted cell can be inter, intra or inter-rat, A UE should not consider these cell while sending measurement report, handovers events or cell-re-selection criteria and save time and select a new cell faster and reduce the neighbor cell list size.

Q26. What are Access Class (AC), How many AC are available in lte?

Ans. Access Class provide information to network that this is a normal user or high priority user, behalf of that a EnodeB decide it have to provide the resource to particular user or not, when EnodeB have less resources available.

For eg a EnodeB have limited resource and suddenly no. Of users are increase on site and Enodeb is unable to provide resource to every UE so it restrict some UE and allocate available resources to particular users only behalf of their AC.

In LTE we have 16 types of AC

• AC 0-9 for normal users only,
• AC 10 for emergency eg: police, ambulance, fire-brigade etc,
• AC 11 and 15 for PLMN users (operators use)only,
• AC 12 for security services users, eg: policemen, intelligence officers, detective officers,
• AC 13 for utility services eg: water, electricity, gas services,
• AC 14 for emergency eg: disaster time govt provide some emergency no.

Q27. From where UE get Barring information?

Ans. Barring information & Barring factor of a AC present in SIB2      MO-Signalling

AC Barring Factor [0 to 0.95]

AC Barring Time [4,8,16,32,64,128,256,512 seconds]

AC Barring Step [0.05]

MO-Data

AC Barring Factor [0 to 0.95]

AC Barring Time [4,8,16,32,64,128,256,512 seconds]

AC Barring Step [0.05]

Q28. What do you mean by Barring Factor, Barring Step, Barring Time?

Ans. AC Barring Factor [0 to 0.95] means how long, for a duration a UE treat this cell as a barred.

Barring Time [4,8,16,32,64,128,256,512 seconds] means how much time duration a cell is barred for AC user.

Q29. What is the duration's of above Barring Information Elements have?

Ans. Barring Factor 0 to 0.95

Barring Time 4,8,16,32,64,128,256,512 seconds

Barring Step 0.05

Q30. What kind of Information is carry in MIB==>PHICH?

Ans. Master information block carry PHICH of 3 bits:-

PHICH 1-bit [normal or extended cyclic prefix info]

PHICH 2-bit [resource allocation info 1/6, 1/2, 1, 2] based on these value identifies the ng groups of DL Resource blocks.