01. UE is Off
02. Power On UE
03. Frequency Search
04. Timing Sync
Time and Frame Synchronization : In this process, PSS and SSS will be decoded as well.
PCI (Physical Cell ID) is derived (a.k.a PCI detection)
Time and Frame Synchronization : In this process, PSS and SSS will be decoded as well.
PCI (Physical Cell ID) is derived (a.k.a PCI detection)
05. Cell Search : Normally a UE would find multiple cells in this process
06. Cell Selection
07. MIB decoding
UE can figure out System Bandwidth and Transmission Mode in this process.
(As you see in Downlink Framestructure, MIB/PBCH is located at the 6 RBs around the
center frequency. So the success of MIB decoding does not guarantee that signal quality
across the whole band is good)
Detect CSR (Cell Specific Reference Signal) and perform Channel Estimation and
Equalization. In this process, UE will detect/measure reference signal across the whole
system bandwidth. So RSRP/RSRQ measured at this step can be a good indicator for
overall signal quality.
Decode PDCCH and extract DCI information for SIB. PDCCH is spread across the whole
bandwidth, so the signal quality across the whole bandwidth should be good enough
for this step.
UE can figure out System Bandwidth and Transmission Mode in this process.
(As you see in Downlink Framestructure, MIB/PBCH is located at the 6 RBs around the
center frequency. So the success of MIB decoding does not guarantee that signal quality
across the whole band is good)
Detect CSR (Cell Specific Reference Signal) and perform Channel Estimation and
Equalization. In this process, UE will detect/measure reference signal across the whole
system bandwidth. So RSRP/RSRQ measured at this step can be a good indicator for
overall signal quality.
Decode PDCCH and extract DCI information for SIB. PDCCH is spread across the whole
bandwidth, so the signal quality across the whole bandwidth should be good enough
for this step.
08. SIB deconding (SIB1 should be decoded first and then SIB2 and then remaining SIBs)
Cell Selection: UE tries camp on to HPLM cell with the highest priority.
Cell Selection: UE tries camp on to HPLM cell with the highest priority.
10. Registration/Authentication/Attach
11. Default EPS Bearer Setup
11.A Now UE is in IDLE Mode
11.B (If the current cell become weak or UE moves to another cell regisn) Cell Reselection
12. (When Paging message comes or User make a call) RACH Process
13. Setup Dedicated EPS Bearer
13.A Receive data
13.B Transmit data
(Full duplex is possible for FDD bands)
13.C (If UE power is percieved too weak by the network)
Network send TPC command to increase UE Tx Power
(If UE power is percieved too strong by the network)
Network send TPC command to decrease UE Tx Power
14. (If UE moves to another cell region) Network and UE perform Handover procedure
15. User stop call and UE gets into IDLE mode
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