11.2.25 Packet System Information 13

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 may be broadcast by the network on the PACCH or on the PCCCH (see sub-clause 5.5.2.1). The message provides the mobile station with GPRS cell specific access-related information. The information in this message shall be the same as provided in the SI13 message on BCCH, see 3GPP TS 04.08. 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.

Message type: PACKET SYSTEM INFORMATION TYPE 13

Direction: network to mobile station

Classification: distribution message

Table 11.2.25.1: PSI13 information elements

< PSI13 message content > ::=

< PAGE_MODE : bit (2) >

< BCCH_CHANGE_MARK : bit (3) >

< SI_CHANGE_FIELD : bit (4) >

{ 0 | 1 < SI13_CHANGE_MARK : bit (2) >

< GPRS Mobile Allocation : < GPRS Mobile Allocation IE > > }

{ 0 — PBCCH not present in cell :

< RAC : bit (8) >

< SPGC_CCCH_SUP : bit >

< PRIORITY_ACCESS_THR : bit (3) >

< NETWORK_CONTROL_ORDER : bit (2) >

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

< GPRS Power Control Parameters : < GPRS Power Control Parameters struct > >

| 1 — PBCCH present in cell :

< PSI1_REPEAT_PERIOD : bit (4) >

< PBCCH Description : < PBCCH Description struct > > }

{ null | 0 — Receiver compatible with ealier release

| 1 — Additions in release 99 :

< SGSNR : bit >

< padding bits > }

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

< GPRS Power Control Parameters struct > ::=

< ALPHA : bit (4) >

< T_AVG_W : bit (5) >

< T_AVG_T : bit (5) >

< PC_MEAS_CHAN : bit >

< N_AVG_I : bit (4) > ;

< PBCCH Description struct > ::=

< Pb : bit (4) >

< TSC : bit (3) >

< TN : bit (3) >

{ 0 — default to BCCH carrier

| 10 < ARFCN : bit (10) >

| 11 < MAIO : bit (6) > } ;

Table 11.2.25.2: PSI13 information element details

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 04.08.

BCCH_CHANGE_MARK (3 bit field)
This field indicates the status of the information on BCCH. The value of this field shall be changed each time the information on BCCH, except for the contents of the SI-13 message, is changed.

SI_CHANGE_FIELD (4 bit field)
This field is the binary representation of which information was changed at the last indication in BCCH_CHANGE_MARK. Range 0 to 15:

bit
4 3 2 1
0 0 0 0 Update of unspecified SI message or SI messages;
0 0 0 1 Update of SI1 message;
0 0 1 0 Update of SI2, SI2 bis or SI2 ter message;
0 0 1 1 Update of SI3, SI4, SI7 or SI8 message;
0 1 0 0 Update of SI9 message;
All other values shall be interpreted as ‘update of unknown SI message type’.

SI13_CHANGE_MARK (2 bit field)
This field is the binary representation of the SI change mark identifying the GPRS Mobile Allocation provided in SI13 and PSI13 messages.
Range: 0 to 3.

GPRS Mobile Allocation (information element)
This information element is the representation of the GPRS mobile allocation provided in SI13 and PSI13 messages. It is identified by MA_NUMBER = 14 when referenced from a packet assignment message. When used in SI13 or PSI13 message, this information element shall refer to the cell allocation defined for the cell in SI1 or PSI2.

RAC (8 bit field)
This field is the binary representation of the Routing Area Code, see 3GPP TS 03.03.

SPGC_CCCH_SUP (bit field)
This field indicates the support of the parameter SPLIT_PG_CYCLE on CCCH from the network side:

0 SPLIT_PG_CYCLE is not supported on CCCH in this cell;
1 SPLIT_PG_CYCLE is supported on CCCH in this cell.

The PRIORITY_ACCESS_THR field (3 bit) is the binary representation of the parameter PRIORITY_ACCESS_THR:

bit
3 2 1
0 0 0 packet access is not allowed in the cell;
0 0 1 spare, shall be interpreted as ‘000’ (packet access not allowed);
0 1 0 spare, shall be interpreted as ‘000’ (packet access not allowed);
0 1 1 packet access is allowed for priority level 1;
1 0 0 packet access is allowed for priority level 1 to 2;
1 0 1 packet access is allowed for priority level 1 to 3;
1 1 0 packet access is allowed for priority level 1 to 4;
1 1 1 spare, shall be interpreted as ‘110’ (packet access allowed).

The NETWORK_CONTROL_ORDER field (2 bit) is the binary representation of the parameter NETWORK_CONTROL_ORDER, see 3GPP TS 05.08:

bit
2 1
0 0 NC0: MS controlled cell re-selection, no measurement reporting.
0 1 NC1: MS controlled cell re-selection, MS sends measurement reports.
1 0 NC2: Network controlled cell re-selection, MS sends measurement reports.
1 1 Reserved for future use, interpreted as NC0 by mobile station.

GPRS Cell Options (information element)
The GPRS Cell Option information element is defined in sub-clause 12.24.

PSI1_REPEAT_PERIOD (4 bit field)
This field is the representation of the PSI1 repeat period. The field is coded according to the following table:

bit
4 3 2 1
0 0 0 0 PSI1 repeat period = 1 multiframe
0 0 0 1 PSI1 repeat period = 2 multiframes
:
1 1 1 1 PSI1 repeat period = 16 multiframes

GPRS Power Control Parameters struct

ALPHA (4 bit field)
For encoding and description see the Global Power Control Parameters IE.

T_AVG_W (5 bit field)
For encoding and description see the Global Power Control Parameters IE.

T_AVG_T (5 bit field)

PC_MEAS_CHAN (1 bit field)
For encoding and description see the Global Power Control Parameters IE.

N_AVG_I (4 bit field)
For encoding and description see the Global Power Control Parameters IE.

PBCCH Description struct
The PBCCH description struct provides the channel description for the PBCCH. The frequency description for the PBCCH may be specified by an ARFCN (non-hopping radio frequency channel) or a MAIO (hopping radio frequency channel) field. In case of a hopping radio frequency channel, the PBCCH shall use the GPRS mobile allocation specified in this message. If none of the ARFCN or MAIO fields are present, the PBCCH shall use the BCCH carrier.

Pb (4 bit field)
For encoding and description see the Global Power Control Parameters IE.

TSC (3 bit field)
This field is the binary representation of the training sequence code used for PBCCH and PCCCHs.
Range: 0 to 7.

TN (3 bit field)
This field is the binary representation of the timeslot number for the PBCCH and the corresponding PCCCH.
Range: 0 to 7.

ARFCN (10 bit field)
This field is the binary representation of the absolute RF channel number.
Range: 0 to 1023.

MAIO (6 bit field)
This field is the binary representation of the mobile allocation index offset.
Range: 0 to 63.

SGSNR (bit field)
This field indicates the Release of the SGSN:
0 SGSN is Release ’98 or older
1 SGSN is Release ’99 onwards.