| 
   | 
  
   | 
  
   
Uplink 
 | 
  |||||||||||
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   | 
  
   
Message 
 | 
  
   
1. PRACH  
 | 
  
   
3. MSG3 
 | 
  
   
5. MSG 5  
 | 
  
   
User Data 
 | 
  
   | 
  |||||||
| 
   
Layer 
 | 
  
   
Channel 
 | 
  
   
Preamble 
 | 
  
   
Onwards 
 | 
  
   | 
  |||||||||
| 
   
RLC 
 | 
  
   
Logical Channel 
 | 
  
   | 
  
   
CCCH 
 | 
  
   
DCCH 
 | 
  
   
DCCH 
 | 
  
   
DTCH 
 | 
  
   | 
  ||||||
| 
   
MAC 
 | 
  
   | 
  
   | 
  |||||||||||
| 
   
MAC 
 | 
  
   
Transport Channel 
 | 
  
   
RACH 
 | 
  
   
UL-SCH 
 | 
  
   | 
  |||||||||
| 
   
PHY 
 | 
  
   
UCI 
 | 
  ||||||||||||
| 
   
PHY 
 | 
  
   
Physical Channel 
 | 
  
   
PRACH 
 | 
  
   
PU-SCH 
 | 
  
   
PUCCH 
 | 
  |||||||||
| 
   | 
  
   
Downlink  
 | 
 ||||||||||||
| 
   | 
  
   
MIB 
 | 
  
   
SIB 
 | 
  
   
Paging 
 | 
  
   
2. RACH  
 | 
  
   
4. MSG4 
 | 
  
   
6. MSG6  
 | 
  
   
User Data 
 | 
  
   | 
 |||||
| 
   
Layer 
 | 
  
   | 
  
   
Response 
 | 
  
   
Onwards 
 | 
  
   | 
 |||||||||
| 
   
RLC 
 | 
  
   
BCCH 
 | 
  
   
BCCH 
 | 
  
   
PCCH 
 | 
  
   
CCCH 
 | 
  
   
DCCH 
 | 
  
   
DCCH 
 | 
  
   
DTCH 
 | 
  
   
MCCH 
 | 
  
   
MTCH 
 | 
 ||||
| 
   
MAC 
 | 
  |||||||||||||
| 
   
MAC 
 | 
  
   
BCH 
 | 
  
   
DL-SCH 
 | 
  
   
PCH 
 | 
  
   
DL-SCH 
 | 
  
   
MCH 
 | 
 ||||||||
| 
   
PHY 
 | 
  
   
DCI 
 | 
  
   
CFI 
 | 
  
   
HI 
 | 
 ||||||||||
| 
   
PHY 
 | 
  
   
PBCH 
 | 
  
   
PD-SCH 
 | 
  
   
PDCCH 
 | 
  
   
PCFICH 
 | 
  
   
PHICH 
 | 
  
   
PMCH 
 | 
 |||||||