The document summarizes LTE procedures including cell search, cell selection, cell re-selection, tracking area updates, paging, random access channel procedure, mobility handovers between X2 and S1, and handover events. The cell search procedure detects downlink synchronization using two channels, the primary and secondary synchronization channels, which are always located in the center of the available spectrum. The random access channel procedure involves the UE sending preambles, receiving a response indicating resources to use for signaling and data transmission on an uplink channel.

1. LTE Procedures
Prepared By: RF Team
AbdelRahman Fady & Mohamed Mohsen

2. Cell Search Procedure-1/2
• Cell search is done to obtain downlink synchronization
with cell to detect the BCCH
• There are two synchronization channels P-SCH & S-SCH
• Synchronization Channel (SCH) always occupies only 63
(62 + DC carrier which is not used) sub-carriers in the
center of the available spectrum Why?!
• SCH are always transmitted in frame 0 & 5

3. Cell Search Procedure-2/2

4. Cell Selection-1/2

5. Cell Selection-2/2

6. Cell Re-Selection-1/4

7. Cell Re-Selection-2/4

8. Cell Re-Selection-3/4

9. Cell Re-Selection-4/4

10. TA(Tracking Area)update-1/2

11. TA(Tracking Area)update-2/2

12. Paging

13. RACH Procedure
1.Either network indicates specific
PRACH resource or UE selects from
common PRACH resources.
2.UE sends random access
preambles at increasing power.
3.UE receives random access
response on the PDCCHwhich
includes assigned resources for
PUSCH transmission.
•Physical Resource Blocks (PRB)
and Modulation and Coding
Scheme (MCS)
4.UE sends signaling and user data
on PUSCH

14. Mobility-X2 Handover

15. Mobility-S1 Handover-1/2

16. Mobility-S1 Handover-2/2

17. Mobility-IRAT Handover

18. Handover Events

19. Handover Events-A3

20. Handover Events-A3

21. Thank You