LTE RA procedure

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LTE Random Access Request (MSG1)

Version = 5
Version5 {
Preamble Sequence = 10
Physical Root Index = 257
Cyclic Shift = 320
PRACH Tx Power = 11 dBm
Beta PRACH = 242
PRACH Frequency Offset = 7
Preamble Format = 0
Duplex Mode = TDD
TDD Info {
f_ra = 0---/f_RA是一个频率位置系数，用于计算PRACH占用的RB起始位置n_RA_PRB/
t_0_ra = Resource reoccurring in all radio frames---/f_ra=0表示prach出现在所有无线帧；f_ra=1表示prach出现在偶数无线帧；f_ra=2表示prach出现在奇数无线帧/
t_1_ra = RA resources in first half frame---/=0表示prach出现在前半帧；=1表示出现在后半帧/
t_2_ra = 0---/=0表示prach出现在子帧2或者7；=1表示出现在子帧3或者8；=2表示出现在子帧4或者9/       
}
Density Per 10 ms = 1
PRACH Timing SFN = 476
PRACH Timing Sub-fn = 2
PRACH Window Start SFN = 476
RACH Window Start Sub-fn = 5
PRACH Window End SFN = 477
PRACH Window End Sub-fn = 5
RA RNTI = 3
PRACH Actual Tx Power = 11
}



LTE Random Access Response (MSG2)


Version = 1
Version1 {
SFN = 476
Sub-fn = 8
Timing Advance = 5
Timing Advance Included = Included
RACH Procedure Type = Contention Based
RACH Procedure Mode = Initial Access
RNTI Type = TEMP_C_RNTI
RNTI Value = 4237
}


LTE UE Identification Message (MSG3)

Version = 1
Version1 {
TPC = 5
MCS = 1
RIV = 107
CQI = Disabled
UL Delay = Don't Delay
Hopping Flag = Disabled
SFN = 477
Sub-fn = 7
Starting Resource Block = 7
Num Resource Blocks = 2
Transport Block Size Index = 1
Modulation Type = QPSK
Redundancy Version Index = 0
HARQ ID = 1
}


LTE Contention Resolution Message (MSG4)

Version = 1
Version1 {
SFN = 478
Sub-fn = 8
Contention Result = Pass
UL ACK Timing SFN = 479
UL ACK Timing Sub-fn = 2
}