9.1.49b VGCS SMS Information

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

This message is sent on the SACCH of the voice group channel, in unacknowledged mode using the RR short protocol discriminator by the network to inform the mobile stations of an incoming RP-Data message for the VGCS group call.

When the talker is on a dedicated channel the VGCS SMS Information message is also sent in unacknowledged mode on the SACCH of this channel.

See Figure 9.1.49b and Table 9.1.49b.

Message type: VGCS SMS Information

Significance: dual

Direction: network to mobile station

Table 9.1.49b VGCS SMS Information message content details

<VGCS SMS INFORMATION> ::=

<RR short PD : bit> — See 3GPP TS 24.007

<message type : bit(5)> — See sub-clause 10.4

<short layer 2 header : bit(2)> — See 3GPP TS 44.006

{ 0 <Non-Segmented_SMS Description : Non-Segmented_SMS Description struct>

|1 <Segmented_SMS Description : Segmented_SMS Description struct> }

<spare padding>;

<Non-Segmented_SMS Description struct> ::=

< Length : bit (8) >

< SMS Reference Number: bit (4) >

< SMS_Final_Content : bit (val(Length)) >

<Segmented_SMS Description struct> ::=

< SMS Reference Number : bit (4) >

< Segment Number : bit (4) >

{ 0 <SMS_Content:bit **> — Not the last Segment

|1 < Length : bit (8)>
< SMS_Final_Content : bit (val(Length)) > } — Last segment

Length (8 bit field)
This field contains the length in bits of the SMS Final Content that is contained within this message instance.

SMS Reference Number (4 bit field)
A number that is allocated by the BSS that identifies the RP-Data message (see 3GPP TS 24.011) over the air interface. The number is incremented by one each time a new RP-Data message is transmitted over the air interface.

Segment Number (4 bit field)

Identifies the segment of a RP-Data message that has been segmented over the air interface.

SMS_Final_Content (val(Length) bit field)
Contains the content of the last segment of a segmented RP-Data message or the entire RP-Data message of a non segmented RP-Data message.

SMS_Content (n bit field)
Contains the content of a segment of a segmented RP-Data message when the segment is not the last segment. The field is variable in size, and fills to the end of the radio block.

Figure 9.1.49b VGCS SMS Information message content details