Call Control
38.4.2
Adaptive Frame Alignment
The RBS calculates TA when uplink DTX is used. The conditions
under which the accuracy of access delay assessments are met, are
those specified in /GSM:05.10:5/.
In order to meet the accuracy of adaptive frame alignment, ideal MS
response according to /GSM:05.10:6/ is required.
38.4.3
Asynchronous Handover Detection
On a TCH (under TU50 propagation conditions at the reference
sensitivity and interference levels /GSM:05.05:6/), the overall reception
performance is such, that the probability of a correct handover detection
within 60 ms after reception of the initial handover access sent from
MS /GSM:04.08:3.4.4/ is better than 99.99%. This assumes that the
initial MS access occurs within 1.0 second after the channel is activated
for asynchronous handover and that a random RF input is received
during the delay.
On an SDCCH, under the same general conditions as for TCH, the
probability of a correct handover detection within 500 ms after reception
of the initial handover access sent from MS is better than 99.99%.
With a random RF input, the probability of a false handover detection
within 1.0 second after the channel is activated for asynchronous
handover is less than 10
–6
.
The HANDOVER DETECTION message is sent to BSC within 25 ms
after the reception of the last handover access used in the handover
detection.
The sending of PHYSICAL INFORMATION to MS begins less than 40
ms after a handover detection, counting from the last handover access
used in the handover detection, to the first burst in the first PHYSICAL
INFORMATION message.
38.4.4
Deactivate SACCH
Transmission on SACCH is stopped, within a multiframe period at the
latest, after reception of the DEACTIVATE_SACCH message.
38.4.5
Transparent Message Transmission
RBS provides storage capacity for at least 500 octets per established
SAPI link.
38.4.6
SACCH Info Modify
The new SACCH Information is stored for the addressed channel group
at the latest within a multiframe period after reception of the
SACCH_INFO_MODIFY message.
38.4.7
LAPDm
The RBS uses a repetition delay between 138.5 and 143.1 ms on
FACCH/F (depending on the position in the multiframe).
252 (306)
EN/LZT 123 2697
R5A
1998-08-13
© Ericsson Radio Systems AB
— All Rights Reserved —
