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Common Control Channel Handling

22.2.2 Immediate Assign

By means of the IMMEDIATE ASSIGNMENT procedure /

GSM:08.58:5.7./, the network signals acceptance or rejection of a

CHANNEL_REQUEST message from MS.

The RBS supports:

•

Reception, interpretation and check of

IMMEDIATE_ASSIGN_COMMAND messages from BSC

• Queuing of IA (Immediate Assign) and IAR (Immediate Assign

Reject)

•

Scheduled transmission of IMMEDIATE_ASSIGNMENT

messages on AGCH (Access Grant CHannel)

• Retransmission of IMMEDIATE_ASSIGNMENT messages on

AGCH

IAs and IARs are queued for scheduled transmission on the AGCH.

The RBS supports one queue for IA messages and one for IAR

messages. The following messages are used for scheduled transmission

of IA and IAR:

•

IMMEDIATE_ASSIGNMENT /GSM:04.08:9.1.18/

•

IMMEDIATE_ASSIGNMENT_EXTENDED /GSM:04.08:9.1.19/

•

IMMEDIATE_ASSIGNMENT_REJECT /GSM:04.08:9.1.20/

For dequeuing, priority handling, selection of Page Mode, transmission

and retransmission, see Section 22.2.4 on page 231.

If two IAs are received in one IMMEDIATE_ASSIGN_COMMAND

message from the BSC, they will be queued together and sent after each

other.

22.2.3 Immediate Assignment Sent

By means of IMMEDIATE ASSIGNMENT SENT procedure the RBS

indicates to the BSC, if ordered, when an

IMMEDIATE_ASSIGNMENT or

IMMEDIATE_ASSIGNMENT_EXTENDED is sent on air interface.

The RBS supports handling of IMMEDIATE_ASSIGNMENT_SENT

messages.

In case the element "Mobile Identiﬁer" is present in the

IMMEDIATE_ASSIGNMENT_COMMAND from the BSC, the

IMMEDIATE_ASSIGNMENT_SENT message is sent on Abis as soon

as the corresponding IMMEDIATE_ASSIGNMENT or

IMMEDIATE_ASSIGNMENT_EXTENDED message has been sent on

air interface. The following information is included:

• Element "Channel Number" indicating the channel on which the

IMMEDIATE_ASSIGNMENT or

IMMEDIATE_ASSIGNMENT_EXTENDED message was

transmitted on.

• Element "Mobile Identiﬁer" as received in the

IMMEDIATE_ASSIGNMENT_COMMAND from the BSC.

230 (485)

EN/LZT 720 0008 P2A

2001-11-28

Preliminary