What happens after initial cell search or cell synchronization ?
EnodeB calculates the distance of UE and sends timing advance. UE performs timing advance and Uplink Synchronization via Random Access procedure

Above Video covers LTE timing advance procedure :

• UpLink Synchronization
• How EnodeB calculates distance of UE
• What is timing advance and Why it is required
• Random access preamble selection and Random Access response
• System Information block 2 , SIB2

After that it will perform Random Access Procedure followed by RRC Connection setup coming up in next video
After it has completed RRC Connection setup it will perform LTE ATTACH

All the 4g lte call flows covered in tieshe video ser