11.2.25a Packet System Information 14

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 sent by the network on the PACCH. The message may provide a mobile station in dual transfer mode with GPRS access-related information. The information may be used as a substitute for the SI13 (and in some cases, the SI1) message on BCCH after the release of an RR connection, see 3GPP TS 04.18. This message may also be used during dual transfer mode to inform the mobile station about possible changes in the SI or PSI messages.

Message type: PACKET SYSTEM INFORMATION TYPE 14

Direction: network to mobile station

Classification: distribution message

Table 12.2.25a.1: PSI14 information elements

< PSI14 message content > ::=

< PAGE_MODE : bit (2) >

{ 0 < CCCH Access Information : < CCCH Access Information struct >>

| 1 < PBCCH Description : < PBCCH Description struct 2 >> }

< padding bits >

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

< CCCH Access Information struct > ::=

< BCCH_CHANGE_MARK : bit (3) >

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

< SI13 Mobile Allocation : < GPRS Mobile Allocation IE >> }

< 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 >>

< SGSNR : bit >

{ null | 0 bit ** = < no string > — Receiver backward compatible with earlier version

| 1 — Additions for Dual Transfer Mode

0 — compatible with earlier version

< RAC : bit (8) >

} ;

< 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 2 > ::=

< PSI1_REPEAT_PERIOD : bit (4) >

< Pb : bit (4) >

< TN : bit (3) >

< PBCCH Frequency Description : < Frequency Parameters IE >>

{ null | 0 bit ** = < no string > — Receiver backward compatible with earlier version

| 1 — Additions for Dual Transfer Mode

1 — compatible with earlier version

< PSI_CHANGED_IND : bit >

} ;

Table 12.2.25a.2: PSI14 information element details

PAGE_MODE (2 bit field)
This field is defined in sub-clause 12.20.

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 SI13 message, is changed, see sub-clause 5.5.2.1.4.

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.

SI13 Mobile Allocation
This field is encoded using the GPRS Mobile Allocation information element defined in sub-clause 12.10a. This information shall be identical with the GPRS mobile allocation provided in SI13 and PSI13 messages.

SPGC_CCCH_SUP (1 bit field)
This field is defined in the SI13 message, see 3GPP TS 04.18.

PRIORITY_ACCESS_THR (3 bit field)
This field is defined in the SI13 message, see 3GPP TS 04.18.

NETWORK_CONTROL_ORDER (2 bit field)
This field is defined in the SI13 message, see 3GPP TS 04.18.

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

SGSNR (1 bit field)
This field is defined in the SI13 message, see 3GPP TS 04.18.

ALPHA (4 bit field),
T_AVG_W (5 bit field),
T_AVG_T (5 bit field),
PC_MEAS_CHAN (1 bit field) and
N_AVG_I (4 bit field)
These fields are defined in the Global Power Control Parameters information element, see sub-clause 12.9.

PSI1_REPEAT_PERIOD (4 bit field)
This field is the binary representation, range 0 to 15, of the PSI1 repeat period. The coding of this field is identical to the coding of the PSI1_REPEAT_PERIOD field in the PSI1 message.

Pb (4 bit field)
This is the binary representation, range 0 to 15, of the power reduction value used by the BTS on PBCCH blocks, relative to the output power on BCCH, see 3GPP TS 05.08.

TN (3 bit field)
This is the binary representation, range 0 to 7, of the timeslot number for the PBCCH, see 3GPP TS 05.02.

PBCCH Frequency Description
The PBCCH frequency description is encoded using the Frequency Parameters information element defined in sub-clause 12.8. When used in this message, the Frequency Parameters information element shall define a non-hopping radio frequency channel or use the direct encoding 2 to define a hopping radio frequency channel.

RAC (8 bit field)
This field is the binary representation of the Routing Area Code, see 3GPP TS 23.003.

PSI_CHANGED_IND (1 bit field)
This field indicates whether the contents of any PSI messages have been changed, see sub-clause 5.5.2.1.3.
If not included in the message, the value "0" shall be assumed.