9.1.46 Uplink busy

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

The understanding of this message is only required for mobile stations supporting VGCS talking and sending of application-specific data.

This message is broadcasted on the voice group call channel on the main DCCH, SAPI=0, by the network in unacknowledged mode to inform the mobile station of the uplink status of the voice group call channel. See table 9.1.46.1.

Message type: UPLINK BUSY

Significance: dual

Direction: network to mobile station

Table 9.1.46.1: UPLINK BUSY message content

IEI	Information element	Type / Reference	Presence	Format	length
	RR management Protocol Discriminator	Protocol Discriminator 10.2	M	V	1/2
	Skip Indicator	Skip Indicator 10.3.1	M	V	1/2
	Uplink busy Message Type	Message Type 10.4	M	V	1
31	Talker Priority and emergency indication	Talker Priority Status 10.5.2.64	O	TLV	3
32	Token	Token 10.5.2.66	O	TV	5
33	Talker Identity	Talker Identity 10.5.2.65	O	TLV	3 – 20
8-	Uplink Access Indication	Uplink Access Indication 10.5.2.74	O	TV	1

9.1.46.1 Talker Priority and Emergency Indication

This IE contains the talker priority, the status of the emergency mode and the availability of the voice group call channel for sending uplink access requests related to talker priority. If the IE is not present then the MS assumes that the emergency mode is not set and that the network does not support talker priority.

NOTE: The channel to be used for uplink access requests related to application-specific data is specified in the Uplink Access Indication (see sub-clause 9.1.46.4).

9.1.46.2 Token

This IE contains the 32 bit long token for the validation of the Priority Uplink Request.

9.1.46.3 Talker Identity

This IE contains the identity of the current talker.

9.1.46.4 Uplink Access Indication

This IE indicates whether a mobile sending application-specific data should perform uplink access on the group call channel or via the RACH.