9.1.7 Channel release

3GPP44.018GSM/EDGE Radio Resource Control (RRC) protocolMobile radio interface Layer 3 specificationRelease 16TS

This message is sent on the main DCCH from the network to the mobile station to initiate deactivation of the dedicated channel used. See table 9.1.7.1.

Message type: CHANNEL RELEASE

Significance: dual

Direction: network to mobile station

Table 9.1.7.1: CHANNEL RELEASE 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

Channel Release
Message Type

Message Type
10.4

M

V

1

RR Cause

RR Cause
10.5.2.31

M

V

1

73

BA Range

BA Range
10.5.2.1a

O

TLV

6 – ?

74

Group Channel Description

Group Channel Description
10.5.2.14b

O (note 1)

TLV

5-13

8x

Group Cipher Key Number

Group Cipher Key Number
10.5.1.10

C

TV

1

Cx

GPRS Resumption

GPRS Resumption
10.5.2.14c

O

TV

1

75

BA List Pref

BA List Pref
10.5.2.1c

O

TLV

3-?

76

UTRAN Freq List

UTRAN Freq List
10.5.2.1d

O

TLV

3-?

62

Cell Channel Description

Cell Channel Description
10.5.2.1b

O

TV

17

77

Cell selection indicator after release of all TCH and SDCCH

Cell selection indicator after release of all TCH and SDCCH
10.5.2.1e

O

TLV

4 – ?

Ax

Enhanced DTM CS Release Indication

Enhanced DTM CS Release Indication
10.5.2.14e

O

TV

1

04

VGCS Ciphering Parameters

VGCS Ciphering Parameters
10.5.2.42b

O

TLV

3-15

78

Group Channel Description 2

Group Channel Description 2
10.5.2.14f

O (note 1)

TLV

13

79

Talker Identity

Talker Identity
10.5.2.65

O

TLV

3-20

7A

Talker Priority Status

Talker Priority Status
10.5.2.64

O

TLV

3

7B

VGCS AMR Configuration

VGCS AMR Configuration
10.5.2.67

O

TLV

3

7C

Individual priorities

Individual priorities
10.5.2.75

O

TLV

3 – ?

NOTE 1: The network may only send either the Group Channel Description or the Group Channel Description 2 element.

9.1.7.1 Group Channel Description / Group Channel Description 2

If a CHANNEL RELEASE is sent to a mobile station which is in dedicated mode and which is involved in a voice group call or has responded to a notification to a voice group call or voice broadcast call, a group channel description (or group channel description 2) may be included, describing the voice group call channel or voice broadcast channel to which the mobile station shall go after the channel release procedure.

Mobile stations not supporting VGCS listening or VBS listening shall ignore the group channel description (or group channel description 2)information element if present.

9.1.7.2 Group Cipher Key Number

This IE may be present only if the Group channel description IE or the Group Channel Description 2 IE is provided. The presence of these IE indicates that the mobile station shall use the Group Cipher Key indicated by the Group Cipher Key Number IE for deciphering on the VGCS or VBS channel. If these IE are not present, no ciphering is applied on the VGCS or VBS channel.

Mobile stations not supporting VGCS listening or VBS listening shall ignore this information element.

9.1.7.3 UTRAN Freq List

This IE should only be sent to UTRAN capable mobile station. This information element is used to describe the UTRAN frequencies used by the network.

9.1.7.4 Cell Channel Description

This IE may be present if the following conditions are satisfied:

– the CHANNEL RELEASE message is ordering the release of the uplink to the originator or to the talker of a VGCS call over a dedicated channel; and

– the Group Channel Description IE is included in the message and is describing a hopping channel.

It shall not be included in any other case.

Mobile stations not supporting VGCS talking or VGCS originating shall ignore this information element if present.

9.1.7.5 VGCS Ciphering Parameters

This information element is only applicable to a VGCS mobile station. It is only included if the group channel is ciphered.

9.1.7.6 Talker Identity

This information element is only applicable to a VGCS talking subscriber. Mobile stations not supporting VGCS talking shall ignore this information element if present.

9.1.7.7 Talker Priority Status

This information element is only applicable to a VGCS talking subscriber. Mobile stations not supporting VGCS talking shall ignore this information element if present.

9.1.7.8 VGCS AMR Configuration

This information element is only applicable to a VGCS talking subscriber. Mobile stations not supporting VGCS talking shall ignore this information element if present.

9.1.7.9 Individual priorities

This information element is sent to provide MS-specific priorities for priority-based cell reselection. The individual priorities shall override the priorities received through system information or individual priorities received previously. The timer T3230 is used to control the availability of the individual priorities.