User's Manual Part 2

STAREX-IS BSM Manual
Page:441(877)
Issue:1.
0
SMD-011-PMA210
4.5.5. Command related to BSC Virtual Call Test
General mobile call is ㅡmade by MS, BSS(BSC, BTS), switching system interworking.
Because the section between MS and BSS is the place where call environment setup
function and modulation and demodulation of voice data are made including allocation
of call resource necessary for radio communication, it is responsible for essential
function in the mobile communication system. Testing call is the function to check the
following: 1) the presence of faults in call processing made between BSS and MS that
excludes the MSC function in the course of mobile call processing, and 2) the quality
of voice. Since it excludes the MS function to, mutual calls such as M2L, L2M, or M2M
cannot be made; however, , but cantest can be perfomed by selecting one between
originating and terminating call. When a testing call was set up, BSS and MS generate
markov data and exchange them and by checking if there is any loss of markov data,
they calculate quality of voice. Terminating call inputs IMSI value of MS to be tested in
BSM and trys paging to set up a call. And Originating call sets up a call by selecting
testing call function of MS. (Originating call is not related to BSM function.)
• BSC Testing Call
It checks the following: 1) if there is any faults in call processing that is carried out
between BSC(SLP) – BTS(CE) - MSs and 2) the quality of voice. If a Call is attempted
in BSM by inputting the the information (i.e., the number of MS, BSC number, BTS
number, sector, frequency resource, MS call setup data (Station Class Mark, Slot Cycle
Index), Service Option(13K Markov, 8K Markov, 13K LoopBack, 8K LoopBack), and
voice packet data rate(Full, half, Quarter, Eighth , Variable rate)), then Call Link
between SLP-CE-MS is set up (setup of testing call) according to the data input. Once
a Call is set up, SLP and MS calculate Frame Error Rate while exchanging markov data.
When a Call is set up and a Call is released, BSM displays data of call resource, FER,
and reason for release.
• Service Option
Service Options of present use for Testing call at BSC include 8K Markov, 13K Markov,
8K loopback, 13K loopback .
• Markov
Once Testing Call is set up, SLP and MS synchronizes their time, and generate
identical data in sequence by Markov Algorithm. SLP and MS receive each other’s data
and compare them with their own to detect errors in the data frame. It can obtain
Forward FER(measured at MS) and Reverse FER(measured at SLP).
LoopBack: When Testing Call is set up, SLP generates voice data and sends them to
MS. MS performs lookback on this data as it is and SLP compares returned data with