System Information Type 4
This is to indicate whether the cell support Cell Broad Casting or not and broadcast about CBCH configuration if it support cell broadcasting.
Example 01 > CBCH Enabled
NAS:RR,System Information Type 4
System Information Type 4 ::= DIVISION
+-L2 Pseudo Length ::= V
| +-L2 Pseudo Length value ::= INT (0..63) [12]
| +-N(SD)or0_1 ::= FIX [0]
| +-N(SD)or0_2 ::= FIX [1]
+-Skip Indicator ::= V
| +-Skip Indicator ::= FIX [0]
+-RR management Protocol Discriminator ::= V
| +-Protocol Discriminator ::= PD [6]
+-System Information Type 4 Message Type ::= V
| +-Message Type ::= MSG [1C]
+-Location Area Identification ::= V
| +-Octet1 ::= DIVISION
| | +-MCC digit 2 ::= INT (0..15) [0]
| | +-MCC digit 1 ::= INT (0..15) [0]
| +-Octet2 ::= DIVISION
| | +-MNC digit 3 ::= INT (0..15) [15]
| | +-MCC digit 3 ::= INT (0..15) [1]
| +-Octet3 ::= DIVISION
| | +-MNC digit 2 ::= INT (0..15) [1]
| | +-MNC digit 1 ::= INT (0..15) [0]
| +-Octet4-5 ::= DIVISION
| +-LAC ::= INT (0..65535) [1]
+-Cell Selection Parameters ::= V
| +-Octet1 ::= DIVISION
| | +-CELL-RESELECT-HYSTERESIS ::= CHOICE [0 dB RXLEV hysteresis for LA re-selection]
| | +-MS-TXPWR-MAX-CCH ::= INT (0..31) [8]
| +-Octet2 ::= DIVISION
| +-ACS ::= CHOICE [System information type 16 and 17 are not broadcast on the BCCH]
| +-NECI ::= CHOICE [New establishment causes are not supported]
| +-RXLEV-ACCESS-MIN ::= INT (0..63) [0]
+-RACH Control Parameters ::= V
| +-Octet1 ::= DIVISION
| | +-Max retrans ::= CHOICE [Maximum 1 retransmission]
| | +-Tx-integer ::= CHOICE [3 slots used to spread transmission]
| | +-CELL_BAR_ACCESS ::= CHOICE [The cell is not barred]
| | +-Call reestablishment allowed ::= CHOICE [Call Reestablishment not allowed in the cell]
| +-Octet2-3 ::= DIVISION
| +-Access Control Class C15-C11 ::= INT (0..31) [0]
| +-Emergency Call allowed ::= CHOICE [Emergency call allowed in the cell to all MSs]
| +-Access Control Class C9-C0 ::= INT (0..1023) [0]
+-CBCH Channel Description ::= TV OPTIONAL:Omit
| +-Octet1 ::= DIVISION
| | +-Channel Description IEI ::= IEI [64]
| +-Octet2 ::= DIVISION
| | +-Channel type and TDMA offset ::= INT (0..31) [1]
| | +-Timeslot number ::= INT (0..7) [0]
| +-Octet3-4 ::= DIVISION
| +-Training Sequence Code ::= INT (0..7) [0]
| +-Hopping channel ::= SWITCH [Single RF channel]
| +-(Hopping channel)=0 ::= BRANCH
| +-spare ::= FIX [0]
| +-Absolute RF Channel Number ::= INT (0..1023) [0]
+-CBCH Mobile Allocation ::= TLV OPTIONAL:Omit
| +-Octet1 ::= DIVISION
| | +-Mobile Allocation IEI ::= IEI [72]
| +-Octet2 ::= DIVISION
| | +-Length of mobile allocation contents ::= LEN (0..255) [0]
| +-Octet3- ::= DIVISION
| +-Mobile Allocation RF Channel ::= OCTETARRAY SIZE(0..8)
+-SI 4 Rest Octets ::= V
+-SI4 Rest Octets_O ::= DIVISION
| +-Optional selection parameters ::= DIVISION
| | +-flg21 ::= SWITCH [L]
| +-Optional Power offset ::= DIVISION
| | +-flg31 ::= SWITCH [L]
| +-flg11 ::= SWITCH [L]
+-flg1 ::= SWITCH [L]
+-(flg1)=L ::= BRANCH
| +-Break indicator ::= CHOICE [Additional parameters are not sent in SYSTEM INFORMATION TYPE 7 and 8]
+-spare padding ::= PAD SIZE(23..23) [2B]
Example 02 > CBCH Not Enabled
GSM CCCH - System Information Type 4
L2 Pseudo Length
0011 00.. = L2 Pseudo Length value: 12
.... 0110 = Protocol discriminator: Radio Resources Management messages (0x6)
.... 0110 = Protocol discriminator: Radio Resources Management messages (0x6)
0000 .... = Skip Indicator: No indication of selected PLMN (0)
Message Type: System Information Type 4
Location Area Identification (LAI)
Location Area Identification (LAI) - 001/01/0
Mobile Country Code (MCC): Unknown (1)
Mobile Network Code (MNC): Unknown (01)
Location Area Code (LAC): 0x0000 (0)
Cell Selection Parameters
001. .... = Cell Reselection Hysteresis: 1
...0 1000 = MS TXPWR MAX CCH: 8
0... .... = ACS: False
.1.. .... = NECI: 1
..10 1001 = RXLEV-ACCESS-MIN: -70 <= x < -69 dBm (41)
RACH Control Parameters
00.. .... = Max retrans: Maximum 1 retransmission (0)
..00 00.. = Tx-integer: 3 slots used to spread transmission (0)
.... ..0. = CELL_BARR_ACCESS: The cell is not barred (0)
.... ...1 = RE: Call Reestablishment not allowed in the cell (1)
0000 0000 0000 0000 = ACC: 0x0000
SI 4 Rest Octets
SI4 Rest Octets_O
L... .... = Selection Parameters: Not Present
.L.. .... = Optional Power Offset: Not Present
..H. .... = GPRS Indicator: Present
GPRS Indicator
...0 01.. = GPRS RA Colour: 1
.... ..0. = SI13 Position: SYSTEM INFORMATION TYPE 13 message is sent on BCCH Norm (0)
.... ...L = SI4 Rest Octets_S: Not Present
L... .... = Break Indicator: Additional parameters "SI4 Rest Octets_S" are not sent in SYSTEM INFORMATION TYPE 7 and 8
Padding Bits: default padding
Example 03 > CBCH Enabled
GSM CCCH - System Information Type 4
L2 Pseudo Length
0100 00.. = L2 Pseudo Length value: 16
.... 0110 = Protocol discriminator: Radio Resources Management messages (0x6)
.... 0110 = Protocol discriminator: Radio Resources Management messages (0x6)
0000 .... = Skip Indicator: No indication of selected PLMN (0)
Message Type: System Information Type 4
Location Area Identification (LAI)
Location Area Identification (LAI) - 001/01/0
Mobile Country Code (MCC): Unknown (1)
Mobile Network Code (MNC): Unknown (01)
Location Area Code (LAC): 0x0000 (0)
Cell Selection Parameters
001. .... = Cell Reselection Hysteresis: 1
...0 1000 = MS TXPWR MAX CCH: 8
0... .... = ACS: False
.1.. .... = NECI: 1
..10 1001 = RXLEV-ACCESS-MIN: -70 <= x < -69 dBm (41)
RACH Control Parameters
00.. .... = Max retrans: Maximum 1 retransmission (0)
..00 00.. = Tx-integer: 3 slots used to spread transmission (0)
.... ..0. = CELL_BARR_ACCESS: The cell is not barred (0)
.... ...1 = RE: Call Reestablishment not allowed in the cell (1)
0000 0000 0000 0000 = ACC: 0x0000
Channel Description - CBCH
Element ID: 0x64
0011 0... = SDCCH/4 + SACCH/C4 or CBCH (SDCCH/4): 6
Subchannel: 2
.... .000 = Timeslot: 0
001. .... = Training Sequence: 1
...0 .... = Hopping Channel: No
..10 .... = Spare: 0x02
Single channel ARFCN: 128
SI 4 Rest Octets
SI4 Rest Octets_O
L... .... = Selection Parameters: Not Present
.L.. .... = Optional Power Offset: Not Present
..H. .... = GPRS Indicator: Present
GPRS Indicator
...0 01.. = GPRS RA Colour: 1
.... ..0. = SI13 Position: SYSTEM INFORMATION TYPE 13 message is sent on BCCH Norm (0)
.... ...L = SI4 Rest Octets_S: Not Present
L... .... = Break Indicator: Additional parameters "SI4 Rest Octets_S" are not sent in SYSTEM INFORMATION TYPE 7 and 8
Padding Bits: default padding