9.1.19 Immediate assignment extended

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

This message is sent on the CCCH by the network to two mobile stations in idle mode to change their channel configurations to different dedicated configurations while they stay in the same cell. See table 9.1.19.1

The L2 pseudo length of this message is the sum of lengths of all information elements present in the message except the IAX Rest Octets and L2 Pseudo Length information elements.

Message type: IMMEDIATE ASSIGNMENT EXTENDED

Significance: dual

Direction: network to mobile station

Table 9.1.19.1: IMMEDIATE ASSIGNMENT EXTENDED message content

IEI

Information element

Type / Reference

Presence

Format

length

L2 Pseudo Length

L2 Pseudo Length
10.5.2.19

M

V

1

RR management Protocol Discriminator

Protocol Discriminator
10.2

M

V

1/2

Skip Indicator

Skip Indicator
10.3.1

M

V

1/2

Immediate Assignment Extended Message Type

Message Type
10.4

M

V

1

Page Mode

Page Mode
10.5.2.26

M

V

1/2

Feature Indicator

Feature Indicator

10.5.2.76

M

V

1/2

Channel Description 1

Channel Description
10.5.2.5

M

V

3

Request Reference 1

Request Reference
10.5.2.30

M

V

3

Timing Advance 1

Timing Advance
10.5.2.40

M

V

1

Channel Description 2

Channel Description
10.5.2.5

M

V

3

Request Reference 2

Request Reference
10.5.2.30

M

V

3

Timing Advance 2

Timing Advance
10.5.2.40

M

V

1

Mobile Allocation

Mobile Allocation
10.5.2.21

M

LV

1-5

7C

Starting Time

Starting Time
10.5.2.38

O

TV

3

IAX Rest Octets

IAX Rest Octets
10.5.2.18

M

V

0-4

NOTE: Index 1 refers to the first mobile station, index 2 refers to the second mobile station.

9.1.19.1 Unnecessary IEs

A mobile station which reacts on the request reference 1 shall consider all information elements as unnecessary IEs except for Requests Reference 1, Channel Description 1, Timing advance 1, Starting Time and if Channel Description 1 IE indicates frequency hopping mobile allocation.

A mobile station which reacts on the request reference 2 shall consider all information elements as unnecessary IE except Requests Reference 2, Channel Description 2, Timing advance 2, Starting Time and if channel description 2 IE indicates frequency hopping mobile allocation.

A mobile station in idle mode shall consider all information elements as unnecessary IEs except for the Page Mode IE.

9.1.19.2 Mobile Allocation

If both channel description IE do not indicate frequency hopping, the length indicator shall be set to zero.

9.1.19.3 Starting Time

This information element appears if a frequency change is in progress. If included the starting time is common to the two referenced mobile stations.

9.1.19.4 Maximum message length

As the maximum length of the resulting layer 3 data cannot exceed 22 octets, it is not possible to use this message type if the total length of the value part of the Mobile Allocation plus, optionally, the length of the Starting Time IE exceeds 5 octets. In this case it is necessary to use the IMMEDIATE ASSIGNMENT message.

9.1.19.5 IAX Rest Octets

The sum of the length of this IE and the L2 Pseudo Length of the message equals 22.