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2G/GSM |
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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
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