Common Control Channel Handling
36.2.2
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. Scheduled transmission of IA and IAR is made with the
following messages:
•
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 36.2.3 on page 230.
36.2.3
CCCH Dequeuing and Transmission
Downlink CCCH capacity is used for PAGING as well as for access
grant (IMMEDIATE ASSIGN).
The RBS supports:
•
Dequeuing and scheduling
•
Packing of messages
•
Selection of Page Mode
•
Retransmission of messages
•
Dummy paging
Handling of Paging is covered in section Paging above. Handling of
Immediate Assign is covered in section Immediate Assign above.
Supported Logical Channels /GSM:05.02:3.3.3/:
AGCH
Access Grant Channel
PCH
Paging Channel
Dequeuing and Scheduling
The RBS dequeues and transmits messages from the CCCH queue
system in the following order of priority, where a) has the highest
priority:
230 (306)
EN/LZT 123 2697
R5A
1998-08-13
© Ericsson Radio Systems AB
— All Rights Reserved —
