12.50 Individual Priorities

3GPP44.060General Packet Radio Service (GPRS)Mobile Station (MS) - Base Station System (BSS) interfaceRadio Link Control / Medium Access Control (RLC/MAC) protocolRelease 17TS

This information element is sent to provide MS-specific priorities for priority-based cell reselection (see 3GPP TS 45.008). The individual priorities shall override the priorities received through system information or previously received individual priorities. The timer T3230 is used to control the validity of the individual priorities.

Table 12.50.1: Individual priorities information element

< Individual priorities IE > ::=

{ 0 | — delete all stored individual priorities

1 — provide individual priorities

< GERAN_PRIORITY : bit(3) >

{ 0 | 1 < 3G Individual Priority Parameters Description :

< 3G Individual Priority Parameters Description struct >> }

{ 0 | 1 < E-UTRAN Individual Priority Parameters Description :

< E-UTRAN Individual Priority Parameters Description struct >> }

{ 0 | 1 < T3230 timeout value : bit (3) > }

};

< 3G Individual Priority Parameters Description struct > ::=

{ 0 | 1 < DEFAULT_UTRAN_PRIORITY : bit(3) > }

{ 1 < Repeated Individual UTRAN Priority Parameters :

< Repeated Individual UTRAN Priority Parameters struct >> } ** 0 ;

< Repeated Individual UTRAN Priority Parameters struct > ::=

{ 0 { 1 < FDD-ARFCN : bit (14) > } ** 0 | 1 { 1 < TDD-ARFCN : bit (14) > } ** 0 }

< UTRAN_PRIORITY : bit(3) > ;

< E-UTRAN Individual Priority Parameters Description struct > ::=

{ 0 | 1 < DEFAULT_E-UTRAN_PRIORITY : bit(3) > }

{ 1 < Repeated Individual E-UTRAN Priority Parameters :

< Repeated Individual E-UTRAN Priority Parameters struct >> } ** 0 ;

< Repeated Individual E-UTRAN Priority Parameters struct > ::=

{ 1 < EARFCN : bit (16) > } ** 0

< E-UTRAN_PRIORITY : bit(3) > ;

Table 12.50.2:  Individual priorities information element details

GERAN_PRIORITY (3 bit field)

UTRAN_PRIORITY (3 bit field)

E-UTRAN_PRIORITY (3 bit field)

These fields are used for the inter-RAT cell re-selection algorithm based on priority information, see sub-clauses 12.51, 12.52 and 12.53.

DEFAULT_UTRAN_PRIORITY (3 bit field)

DEFAULT_E-UTRAN_PRIORITY (3 bit field)

The DEFAULT_UTRAN_PRIORITY field is encoded as the UTRAN_PRIORITY field; the DEFAULT_E-UTRAN_PRIORITY field is encoded as the E-UTRAN_PRIORITY field. Any UTRAN frequency contained in the 3G Frequency list and not explicitly listed in any occurrence of the Repeated Individual UTRAN Priority Parameters IE or any E-UTRAN frequency contained in the E-UTRAN Neighbour Cell list and not explicitly listed in any occurrence of the Repeated Individual E-UTRAN Priority Parameters IE shall be assigned the corresponding default value. If the Repeated Individual UTRAN Priority Parameters IE is not present, every UTRAN frequency in the 3G Frequency list for the serving cell shall be assigned the default value. If the Repeated Individual E-UTRAN Priority Parameters IE is not present, every E-UTRAN frequency in the E-UTRAN Neighbour Cell list for the serving cell shall be assigned the default value.

FDD-ARFCN (14 bit field)

TDD-ARFCN (14 bit field)

EARFCN (16 bit field)

These fields are used to indicate the frequencies for which priorities are provided, see sub-clauses 11.2.21b and 12.53.

T3230 timeout value (3 bit field)

The timer uses 3 bits to indicate the time for which the signalled individual priorities are valid:

0 0 0 5 minute timeout;

0 0 1 10 minute timeout;

0 1 0 20 minute timeout;

0 1 1 30 minute timeout;

1 0 0 60 minute timeout;

1 0 1 120 minute timeout;

1 1 0 180 minute timeout;

1 1 1 reserved for future use; if received, it shall be interpreted by the mobile station as "110";

If this information element is not present, the mobile station shall consider the signalled individual priorities to be valid until the occurrence of one of the conditions specified in subclause 5.5.1.1c.3.