9.1.49a VGCS Additional Information

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

This message is sent on the main DCCH or SACCH of the voice group channel, in unacknowledged mode using the RR short protocol discriminator by the network to inform the mobile stations of the identity of the current talker.

Mobile stations not supporting VBS or VGCS shall ignore this message.

See Figure 9.1.49a and Table 9.1.49a.

Message type: VGCS Additional Information

Significance: dual

Direction: network to mobile station

<VGCS ADDITIONAL INFO> ::= <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 <talker identity length: bit(5)> <filler bits: bit(3)> {<talker identity: bit(8 * val (talker identity length)>} <spare padding>;

Figure 9.1.49a: VGCS Additional Information message content

Table 9.1.49a VGCS Additional Information message content details

talker identity length (5 bit field) This field contains the length of the talker identity field in (0-17) bytes

filler bits (3 bit field) This field contains the number of filler bits in the last octet of the talker identity field. The contents of this field is copied from the filler bits field within the talker identity IE that is received in the VGCS Additional Information message on the A-interface (see 3GPP TS 48.008).

talker identity (8 * val (talker identity length) bit field) Contains the identity of the current talker. The contents of this field are copied from the Talker Identity field within the Talker Identity IE included in the VGCS Additional Information message received on the A-interface (see 3GPP TS 48.008)