Common Control Channel Handling
Table 27
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 repeat
ON, OFF
Automatic retransmission of pagings and
immediate assigns in use (ON), or not in use
(OFF).
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).
36.2.4
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
50 ms are discarded. Stored messages are transferred in the same order
as they arrive from MS.
Emergency calls have precedence over temporarily stored messages.
Each accepted CHANNEL_REQUEST is reported to BSC as a
CHANNEL_REQUIRED message according to /GSM:08.58:8.5.3/.
36.3
Operational Conditions
36.3.1
Paging
The number of paging groups supported by the RBS is dependent on
the channel combination:
•
(iv) The use of 16-81 paging groups is supported
EN/LZT 123 2697
R5A
1998-08-13
233 (306)
© Ericsson Radio Systems AB
— All Rights Reserved —
