Reference Manual

Common Control Channel Handling
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:
Table 150 Configuration parameters
Parameter Supported
Values
Description
BS_AG_BLKS_RES 0-1 Number of blocks in each 51 TDMA frame
multiframe reserved for AGCH /
GSM:05.02:3.3.2.3/ /GSM:05.02:6.5.1/.
BS_PA_MFRMS 2-9 Number of 51 TDMA frame multiframes between
transmissions of paging messages to mobiles of
the same paging group /GSM:05.02:3.3.2.3/ /
GSM:05.02:6.5.1/.
CCCH options/CR ON, OFF Automatic retransmission of pagings and
immediate assigns in use (ON), or not in use
(OFF).
CCCH options/IPT3 ON, OFF Paging request type 3 used (OFF) or not used
(ON).
DRX_DEV_MAX 0-100 0-100 % allowed use of extended page mode per
paging group (for example 50 %, means that Page
mode Extended is used every other time it is
possible to use it).
22.2.5 Channel Request by MS
By means of the CHANNEL REQUEST BY MS procedure /
GSM:08.58:5.1./, the RBS detects channel requests (random accesses)
from MSs, and reports these as CHANNEL_REQUIRED messages to
BSC.
The RBS supports:
• Detection of CHANNEL_REQUESTS on RACH
• Transmission of CHANNEL_REQUIRED messages to BSC
The channel request is coded as AB (access bursts) /GSM:05.02:5.2.7./
and /GSM:05.03:4.6./.
The RBS observes the TDMA frame number and measures the access
delay of the AB arrival.
If the rate of CHANNEL_REQUESTs is higher than specified in the
section Operational Conditions below, messages may be temporarily
stored before transmission to the BSC. Messages not transmitted within
234 (485)
EN/LZT 720 0008 P2A
2001-11-28
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Preliminary