11.2.23a Packet System Information Type 6

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

This optional message is sent by the network on the PBCCH or PACCH to provide broadcast information required by non-GSM networks. 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. If not all information fits into one instance of the PSI6 message, the PSI6 message can be repeated.. Special requirements for the transmission of this message apply on PBCCH, see 3GPP TS 05.02.

Message type: PACKET SYSTEM INFORMATION TYPE 6

Direction: network to mobile station

Classification: distribution message

Table 11.2.23a.1: PSI6 information elements

< PSI6 message content > ::=

< PAGE_MODE : bit (2) >

< PSI6_CHANGE_MARK : bit (2) >

< PSI6_INDEX : bit (3) >

< PSI6_COUNT : bit (3) >

{ {< NonGSM Message : < Non-GSM Message struct > > **

— The Non-GSM Message struct is repeated until:

{ < spare bit > *3 00000 } — A) val(NR_OF_CONTAINER_OCTETS) = 0, or

< padding bits > } // — B) the PSI message is fully used

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

< NonGSM Message struct > ::=

< NonGSM Protocol Discriminator : bit(3) >

< NR_OF_CONTAINER_OCTETS : bit(5) exclude 00000 } >

{ < CONTAINER : bit(8) > } * (val(NR_OF_CONTAINER_OCTETS)) ;

Table 11.2.23a.2: PSI6 information element details

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

PSI6_CHANGE_MARK (2 bit field)

The PSI6 change mark field is changed each time information has been updated in any of the PSI6 messages. A new value indicates that the mobile station shall re-read the information from the PSI6 message. The coding of this field is network dependent.

Range: 0-3.

PSI6_INDEX (3 bit field) and PSI6_COUNT (3 bit field)
The purpose of the PSI6_INDEX field and the PSI6_COUNT field is to indicate the number of individual messages within the sequence of PSI6 messages and to assign an index to identify each one of them. The PSI6_INDEX field is binary coded, range: 0 to 7, and provides an index to identify the individual PSI6 message. The PSI6_COUNT field is binary coded, range: 0 to 7, and provides the PSI6_INDEX value for the last (highest indexed) message in the sequence of PSI6 messages.

NonGSM Protocol Discriminator (3 bit field)
This information element is used to identify the non-GSM network for which a PSI6 message is transmitted and is coded as shown below.

Bit
3 2 1

0 0 1 TIA/EIA-136

All other values are reserved

NR_OF_CONTAINER_OCTETS (5 bit field)
This field indicates the number of CONTAINER octets that forms a specific non-GSM message and is coded as shown below.

Bit

5 4 3 2 1

0 0 0 0 1 CONTAINER length is 1 octet

0 0 0 1 0 CONTAINER length is 2 octets

… through …

1 0 0 1 1 CONTAINER length is 19 octets

1 1 1 1 1 The remaining portion of the PSI message is used by the associated CONTAINER. The Non-GSM message continues in a subsequent instance of the PSI message, in the next CONTAINER with the same Non-GSM Protocol Discriminator value as the current one.

All other values are reserved.

CONTAINER (8 bits)

The concatenation of one or several CONTAINER octets forms the actual contents, specific to the non-GSM network soliciting the transmission of a PSI6 message.