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LTE Procedures
Prepared By: RF Team
AbdelRahman Fady & Mohamed Mohsen
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
Cell Search Procedure-2/2
Cell Selection-1/2
Cell Selection-2/2
Cell Re-Selection-1/4
Cell Re-Selection-2/4
Cell Re-Selection-3/4
Cell Re-Selection-4/4
TA(Tracking Area)update-1/2
TA(Tracking Area)update-2/2
Paging
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
Mobility-X2 Handover
Mobility-S1 Handover-1/2
Mobility-S1 Handover-2/2
Mobility-IRAT Handover
Handover Events
Handover Events-A3
Handover Events-A3
Thank You

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LTE Procedures