9.1.43s EC System information type 4

3GPP44.018GSM/EDGE Radio Resource Control (RRC) protocolMobile radio interface Layer 3 specificationRelease 17TS

This message is optionally sent on the EC-BCCH if EC-GSM-IoT and network sharing is supported in the cell. It is sent by the network providing network sharing information and access control information for the additional PLMNs. Multiple instances of this message may be sent by the network. The requirements for transmission of this message are defined in see 3GPP TS 45.002.

Message type: EC SYSTEM INFORMATION TYPE 4

Significance: dual

Direction: network to mobile station

< EC System Information Type 4 > ::=

< Message Type : bit (3) >

< EC SI 4_INDEX : bit (2) >

< EC SI 4_COUNT : bit (2) >

< EC SI_CHANGE_MARK : bit (5) >

{ 0 | 1 < Network Sharing Information : < Network Sharing Information struct >> }
< spare padding > ;

< Network Sharing Information struct > ::=

< Common_PLMN_Allowed : bit (1) >

< Nb_Additional_PLMNs : bit (2) >

{ { 0 | 1 < MCC : bit (12) > } < MNC : bit (12) >

{ 0 | 1 < NCC Permitted : bit (8) > }

{ 0 | 1 < EC_Access_Control_Class : bit (7) >

< Exception_Report_Status : bit (1) > }

} * ( val (Nb_Additional_PLMNs)+1) ;

Figure 9.1.43s.1: EC SYSTEM INFORMATION TYPE 4 message content

Table 9.1.43s.1: EC SYSTEM INFORMATION TYPE 4 information element details

Message Type (3 bits)
The Message Type field is encoded according to Table 10.4 .4.

EC SI 4_INDEX (2 bits) and EC SI 4_COUNT (2 bits)
The purpose of these fields is to indicate the number of individual message instances within the sequence of EC SI 4 messages and to assign an index to identify each instance. The EC SI 4_INDEX field is binary coded, range 0 to 3, and provides an index to identify an individual EC SI 4 message instance. The EC SI 4_COUNT field is binary coded, range 0 to 3, and provides the value of the highest indexed message instance in the sequence of EC SI 4 messages.

EC SI_CHANGE_MARK (5 bits)
This field is defined in Table 9.1.43p.1.

Common_PLMN_Allowed (1 bit)
This field indicates whether or not a MS is allowed to select the Common PLMN. It is coded as follows:

Bit
0 The MS is not allowed to select the Common PLMN.
1 The MS is allowed to select the Common PLMN.

Nb_Additional_PLMNs (2 bits)
This field indicates the number of Additional PLMN IDs broadcasted in this message. It is coded as follows:

Value
0 0 a single Additional PLMN ID is broadcast
0 1 2 Additional PLMN IDs are broadcast
1 0 3 Additional PLMN IDs are broadcast
1 1 4 Additional PLMN IDs are broadcast

MCC and MNC (24 bits)

This field contains the PLMN ID for each Additional PLMN. If for a given MNC the MCC field is missing, the previously listed MCC in this message shall be used instead, or if no such exists, the MCC provided as part of the Location Area Identification IE in EC SYSTEM INFORMATION TYPE 2 message shall be used instead.

The MCC and MNC value fields are coded as specified in sub-clause 10.5.3.

NCC Permitted (8 bits)

The purpose of this field is to provide for each Additional PLMN the list of allowed NCCs on the neighbour BCCH carriers.

The NCC Permitted value field is coded as the value part of the NCC Permitted IE specified in sub-clause 10.5.2.27.

In the absence of this field all neighbour BCCH carriers (regardless of NCC) are allowed for cell reselection.

EC_Access_Control_Class (7 bits)
This field contains a bitmap indicating the barring status for Access Control Classes 0 to 15 (AC C0 to AC C15), applicable in the corresponding Additional PLMN. It is coded as defined in Table 9.1.43q.1. If this field is not present for the PLMN selected by the MS it shall assume its access class is not barred.

Exception_Report_Status (1 bit)
This field indicates whether sending of exception reports are allowed or not in the corresponding Additional PLMN.
It is coded as defined in Table 9.1.43q.1. If this field is not present for the PLMN selected by the MS it shall assume exception reports are not barred.