9.1.21h VBS/VGCS reconfigure

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

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

This message is sent on the main DCCH, in unacknowledged mode (to mobile stations in group receive mode) or acknowledged mode (to mobile stations in group transmit mode) using the RR short protocol discriminator by the network to notify mobile stations in an on-going voice broadcast calls or voice group calls of a change to the current VBS/VGCS channel description with a starting time.

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

See table 9.1.21h.1.

Message type: VBS/VGCS RECONFIGURE

Significance: dual

Direction: network to mobile station

Table 9.1.21h.1: VBS/VGCS RECONFIGURE message content

<VBS/VGCS RECONFIGURE> ::=

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

<message type : bit(5)> — See 10.4

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

{ null | 0 bit** = < no string >} – Receiver backward compatible with earlier version

<new Group Channel Description>

This field provides only the Channel description in the case of non hopping channels. In the case where the channel is hopping either a mobile allocation or a frequency short list is provided.

<new Group Channel Description> : :=

{ 0 — Non hopping case

|1 { 0 <Mobile Allocation : <bit string>>

|1 <Frequency Short List : bit(64)>}} ;

<bit string> ::= null | bit <bit string> ;

<Channel Description>

This field is syntactically and semantically equivalent to octets 3-5 of the Group Channel Description information element. See sub-clause 10.5.2.14b.

<Frequency Short List>

This field is syntactically and semantically equivalent to octets 1-8 of the Frequency Short List 2 information element. See sub-clause 10.5.2.14a.

<Mobile Allocation>

This field is syntactically and semantically equivalent to octet 2 to n+2 of the Mobile Allocation information element. See sub-clause 10.5.2.21.

<Starting Time>

This field defines a starting time at which the new VBS or VGC channel description takes effect. The starting time field is coded as the V format of the type 3 information element Starting Time. See sub-clause 10.5.2.38.

<Additional Segment>

This field indicates that a VBS/VGCS RECONFIGURE2 message with a Cell Channel Description follows the VBS/VGCS RECONFIGURE message. If this field is set to ‘0’ then cell channel description is assumed to be unchanged and no VBS/VGCS RECONFIGURE2 follows.