11.2.18 Packet System Information Type 1

04.603GPPGeneral Packet Radio Service (GPRS)Mobile Station (MS) - Base Station System (BSS) interfaceRadio Link Control / Medium Access Control (RLC/MAC) protocolRelease 1999TS

This message is sent by the network on the PBCCH or PACCH giving information for Cell selection, for control of the PRACH, for description of the control channel(s) and optional global power control parameters. This message shall not be segmented across more than one RLC/MAC control block by using the procedures specified in sub-clause 9.1.12a. Special requirements for the transmission of this message apply on the PBCCH, see 3GPP TS 05.02.

Message type: PACKET SYSTEM INFORMATION TYPE 1

Direction: network to mobile station

Classification: distribution message

Table 11.2.18.1: PSI1 information elements

< PSI1 message content > ::=

< PAGE_MODE : bit (2) >

< PBCCH_CHANGE_MARK : bit (3) >

< PSI_CHANGE_FIELD : bit (4) >

< PSI1_REPEAT_PERIOD : bit (4) >

< PSI_COUNT_LR : bit (6) >

{ 0 | 1 < PSI_COUNT_HR : bit (4) > }

< MEASUREMENT_ORDER: bit (1) >

< GPRS Cell Options : < GPRS Cell Options IE > >

< PRACH Control Parameters : < PRACH Control Parameters IE > >

< PCCCH Organization Parameters : < PCCCH Organization Parameters IE > >

< Global Power Control Parameters : < Global Power Control Parameters IE > >

< PSI_STATUS_IND : bit >

{ null | 0 — Receiver backward compatible with earlier release

| 1 — Additions in release 99 :

< MSCR : bit >

< SGSNR : bit >

< BAND_INDICATOR : bit >

< padding bits > }

! < Distribution part error : bit (*) = < no string > > ;

Table 11.2.18.2: PSI1 information element details

GPRS Cell Options
This information element is defined in sub-clause 12.24

Global Power Control Parameters
This information element is defined in sub-clause 12.9.

MEASUREMENT ORDER (1 bit field)
The MEASUREMENT ORDER field indicates if set = 0 that the mobile station is in control of the cell re-selection in both packet idle mode and packet transfer mode (= NC0 in 3GPP TS 05.08) and that the mobile station shall not send any measurement reports to the network (= NC0 and = EM0 in 3GPP TS 05.08). It also indicates that the Optional PSI5 message is not broadcast.
If set = 1 the mobile station shall send measurement reports for cell re-selection and/or for extended measurements to the network. Further cell re-selection and measurement details are included in the PSI5 message.

PAGE_MODE (2 bit field)
This field describes which type of page mode used, i.e. either normal paging, extended paging, paging reorganization or same as before from the previous page mode. The mobile station shall ignore this field if the message is received on the PACCH. Coding of this field is defined in 3GPP TS 04.18.

PBCCH_CHANGE_MARK (3 bit field)
The PBCCH_CHANGE_MARK field is a 3 bit counter incremented with one each time information has been changed in one or more of the broadcast PSI2-PSIn messages on PBCCH (n>2).

PSI_CHANGE_FIELD (4 bit field)
The PSI_CHANGE_FIELD is a 4 bit value reflecting which PSI message or group of instantiated PSI message was most recent updated when the PBCCH_CHANGE_MARK was last incremented. If more than one PSI message or group of instantiated PSI message were changed at the same time, the PSI_CHANGE_FIELD indicates unspecified updates. Range 0 to 15.

Bit
4 3 2 1
0 0 0 0 Update of unspecified PSI message(s);
0 0 0 1 Unknown

0 0 1 0 PSI2 updated
0 0 1 1 PSI3/PSI3bis/PSI3ter/PSI3quater updated
0 1 0 0 PSI4 updated

0 1 0 1 PSI5 updated
0 1 1 0 PSI6 updated
0 1 1 1 PSI7 updated
1 0 0 0 PSI8 updated
All other values shall be interpreted as ‘Update of unknown SI message type’.

PSI1_REPEAT_PERIOD (4 bit field)
This field is the binary representation of the PSI1_REPEAT_PERIOD parameter value minus one, see 3GPP TS 05.02. The field is coded according to the following table:

Bit
4 3 2 1
0 0 0 0 PSI1_REPEAT_PERIOD = 1
0 0 0 1 PSI1_REPEAT_PERIOD = 2
. . .
1 1 1 1 PSI1_REPEAT_PERIOD = 16

PSI_COUNT_LR (6 bit field)
This field is the binary representation of the PSI_COUNT_LR parameter, see 3GPP TS 05.02. The field is coded according to the following table:

Bit
6 5 4 3 2 1
0 0 0 0 0 0 PSI_COUNT_LR = 0
0 0 0 0 0 1 PSI_COUNT_LR = 1
. . .
1 1 1 1 1 1 PSI_COUNT_LR = 63

PSI_COUNT_HR (4 bit field)
This field is the binary representation of the PSI_COUNT_HR parameter value minus one, see 3GPP TS 05.02. If PSI_COUNT_HR is not included in PSI1 message, the default value PSI_COUNT_HR = 0 applies. The field is coded according to the following table:

Bit
4 3 2 1
0 0 0 0 PSI_COUNT_HR = 1
0 0 0 1 PSI_COUNT_HR = 2
. . .
1 1 1 1 PSI_COUNT_HR = 16

PCCCH Organization Parameters
This information element is defined in sub-clause 12.25

PRACH Control Parameters
This information element is defined in sub-clause 12.14.

PSI_STATUS_IND (1 bit field):
0 The network does not support the PACKET PSI STATUS message;
1 The network supports the PACKET PSI STATUS message.

MSCR, MSC Release (1 bit field):
0 The MSC is Release ’98 or older
1 The MSC is Release ’99 onwards

SGSNR, SGSN Release (1 bit field)
0 The SGSN is Release ’98 or older
1 The SGSN is Release ’99 onwards

BAND_INDICATOR (1 bit field)
See 3GPP TS 05.05 for definition of this field, which is coded as follows:
0 ARFCN indicates 1800 band
1 ARFCN indicates 1900 band