Common Control Channel Handling
Selection of Page Mode
The RBS selects the appropriate Page mode value /GSM:04.08:-
10.5.2.26./ for each message. The following Page modes are used:
• Normal
• Extended
The allowed use of extended page mode is configured (as a percentage)
on command from the BSC. This is done by means of configuration
parameter DRX_DEV_MAX, see Administration on page 232.
Retransmission of Messages
Copies of IMSIs, TMSIs and IAs transmitted from their respective
queues, are stored on a stack (one stack/ paging queue) for
retransmission (IARs are not stored for retransmission).
An IMSI or TMSI stored for retransmission is discarded, depending on
the setting of parameter BS_PA_MFRMS (see Administration on page
232) as specified below:
• BS_PA_MFRMS _ 3
− The IMSI/TMSI is discarded if it has not been
retransmitted within two schedulings of its paging group
• BS_PA_MFRMS > 3
− The IMSI/TMSI is discarded if it has not been
retransmitted within one scheduling of its paging group
No message is retransmitted more than once. An IA is discarded if it
has not been retransmitted within 80 ms. The BSC may turn the
retransmission function on and off by means of configuration parameter
CCCH Repeat, see Administration on page 232.
Dummy Paging
Whenever no PAGING_REQUEST or IMMEDIATE_ASSIGNMENT
message is scheduled for transmission in a CCCH block, a Dummy
Paging message is used.
The message used for Dummy Paging is a PAGING_REQUEST type 1
/GSM:04.08:9.1.22./.
Administration
The following configuration parameters are used to control the
transmission of PAGING_REQUEST messages and
IMMEDIATE_ASSIGNMENT messages on downlink CCCH:
232 (306)
EN/LZT 123 2697 R5A
1998-08-13
© Ericsson Radio Systems AB
— All Rights Reserved —
To Next Page
Loading...
