MCOM 4.2 Tool


Mobile Communications Network Application (MCOM) was first introduced as a Mapbasic application tool to create a graphical representation of a mobile network in MapInfo.
Starting version 3.0, MCOM has become a stand-alone application. MCOM acts as an OLE client with MapInfo running in the background. This allows MCOM to have the flexibility and versatility to integrate new functions that MapBasic cannot provide.
In this latest version, you get the similar user-interface as in MapInfo plus the additional ND/NPI tools.
MCOM's features can be categorised into following groups:

·         Cell-Planning Tools
·         Drive Test Analysis Tools [GSM only]
·         STS Analysis Tools


Cell planning Tools features is listed below:
·         Site database handling allows user to create a new site, edit or deleting existing sites on spot. [New]
·         Site Editor allows user to change all the site data including adding or deleting new cell. MCOM will redraw the site immediately after you apply the changes.
·         Quick frequency change. Edit and redraw carrier data of a selected cell immediately.
·         Able to locate a site with given Site Id.
·         Able to Show neighbours of a user-selected cell.
·         Able to show co-BCCH, co-channel & adjacent cells of a user-selected frequency or cell for GSM network. User can select more than one frequency at a time.
·         Able to show co-Control Channel, co-channel & adjacent cells of a user-selected frequency or cell for TDMA network. User can select more than one frequency at a time. [Enhanced]
·         User can select more than one frequency at a time to show the interference. [New]
·         Able to show cells with given BSIC/Color Code.
·         Able to show cells with given Frequency Group [TDMA only]
·         User customised colours for all show layers.
·         Able to Import Cell information and display it graphically.
·         Able to import the Map vector data (e.g. roads, coast, river etc.) from TCP/EET map database into MapInfo format using the Import Wizard. [New]
·         Able to Export MCOM2001 databases to text database files.



Drive Test Analysis Tools
 MCOM2001 provides an all-in-one box Drive Test Analysis tool to assist in drive test analysis based on TEMS logs. This feature is currently available for GSM TEMS logs only.
A summary of Drive Test Analysis features is listed below:

·         All-in-one box control, DrvTest Navigator (similar to TEMS Replay log file control).
·         Display drive-test data in DrvTest View.
·         Able to show serving cell on the map.
·         Able to Play, Step forward & backward drive test log files.
·         Able to jump to any drive test point and start playing from there.
·         Auto creates signal strength & quality layers upon loading GIMS Geographical Information Mobile Surveys by Ericsoft log files.
·         Able to display the signal strength plot of a single selected cell.
·         User-customised drive test thematic properties.
·         Able to support Signal Strength unit in either dBm or GSM.



STS Analysis Tools
MCOM2001 provides useful tools for STS analysis as well. MCOM2001 uses the same STS Database file as another Statistical Tool namely, Statics Statistical Tool by Chan Huan Kean.
MCOM2001 also supports statistics data created by SPOS and Turtle program. Before importing the STS Data from these tools, a STS database must be created.
A summary of these tools is listed below:
  • Cell Level Statistics View.
  • Handover Relation Statistics View.
  • STS Navigator for displaying user customized statistical reports on a geographical map.


 





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WCDMA Question for Interview

1.         What is the WCDMA technology?
2.         What is the different between WCDMA & GSM?
3.         What is the different between CDMA & WCDMA?
4.         What is architecture & Interface of WCDMA?
5.         What are the channel concepts of WCDMA Network?
6.         What are the Logical, transport & physical channel in WCDMA?
7.         What is the channel mapping in WCDMA?
8.         What is the cell search procedure?
9.         What are the RRC and what are the RRC states?
10.       What is location registration?
11.       What is the admission control & congestion control?
12.       What is the power control?
13.       UE TX Power
14.       What are the types of handover?
15.       What is Handover procedure?
16.       What are the handover Parameter?
17.       When Events 2A, 2B, 2C & 2E occur?
18.       When Event 1A-1F events occur?
19.       What are theSIR, RSCP, RSSIand EC/NO?
20.       What is the CPICH?
21.       What is the channelization and scrambling code?
22.       What is the code tree?
23.       What is the spreading factor?
24.       What is the cell breathing?
25.       What is the Pilot Pollution? 
26.       What are the near far effects?
27.       What are the noise rise effects?
28.       What is compressed mode?
29.       What is the processing Gain?
30.       What is the Pole capacity?
31.       What are Rake receiver and WCDMA reception issue?
32.       What is the different between CELL_PCH & URA_PCH?
33.       What are the types of measurement?
34.       What is the paging? What are types of paging and why paging is required?
35.       What is the cell update procedure and what are the various cell update cause?
36.       What is active set?
37.       What is virtual active set?
38.       What is the monitoring & detected cell set?
39.       What are the various types of RNC?
40.       What is the channel concept and channel mapping in WCDMA Network?
41.       What is the SIB?
42.       What are the idle mode and cell search parameter?
43.       What are the admission control & congestion control parameter

Thanks to read Article and Best of luck for your interview.

BTS power control in GSM


BTS power control
Parameter
Description
Range
Ericsson Dafault Value
Remarks
DBPSTATE
Dynamic BTS power control state
ACTIVE, INACTIVE
INACTIVE

SDCCHREG
SDCCH power control switch
ON, OFF
OFF
SDCCH power control switch. Identifies if power control on
SDCCH is allowed on non BCCH frequencies.
SSDESDL
defines the target value for the desired signal strength downlink as measured by MS in different parts of the power control interval.
47 to 110 dbm
70
Lower desired SS to prevent interference in Urban Area
REGINTDL
Regulation interval, downlink
1 to 10 SACCH periods
5
Faster steps of powering up by 2 dB at 1 SACCH
SSLENDL
Length of downlink signal strength filter
3 to 15 SACCH periods
5

LCOMPDL
Path Loss compensator factor, downlink
0 to 100 %
70
When set to zero there is no power control towards SSDESDL.
QDESDL
Desired quality, downlink
0 to 70 dtqu
20
RxQual = 0
QCOMPDL
Quality deviation compensation factor, downlink
0 to 60 %
30%
When set to zero, no quality compensation is performed.
QLENDL
Length of downlink quality filter
1 to 20 SACCH periods
8

BSPWRMIN
Min allowed output power for the BTS at the locating reference point on the non Bcch freqs
 -20 to +50 dbm
20

GSM Neighbor cell Parameter


Neighbor cell Parameter
Parameter
Description
Range
Ericsson Default Value
Remarks
CELLR
Related Cell designation
1 to 7 Characters
 -

KHYST
Signal strength hystersis when evaluating K-cells
0 to 63db
3 dB

LHYST
Path Loss hystersis when evaluating L-cells
0 to 63db
3 dB

TRHYST
Signal Strength hysteresis for a K- and L- cell border segment
 -63 to 63 db
2 dB

KOFFSET
Signal strength offset when evaluating K-cells
0 to 63 db
0
If set to 6 dB, Slower handover to CELLR
LOFFSET
Path Lloss offset when evalutaing L-cells
 -63 to 63 db
0

TROFFSET
Signal strength offset for a K- and L-cell border segment
 -63 to 63 db
0

BQOFFSET
Signal strength region for bad quality urgency handovers
0 to 63db
63 dB
If set to 0 dB, faster handover to CELLR
CAND
Candidate Type
AWN, NHN, BOTH
BOTH


AWN: Neighbour at assignment to worse cell




NHN: Neighbour at normal handover and at assignment to better cell




BOTH: Both of the above



AWOFFSET
Signal strength region where assignment to worse cell is allowed
0 to 63 db
3 dB
3 dB -> 20 dB when Serving cell is Congested, to offload to other cell [CELLR]
HIHYST
Signal strength hysteresis when evaluating high signal strength cells
0 to 63 db
5 dB

LOHYST
Signal strength hysteresis when evaluating low signal strength cells
0 to 63 db
3 dB

HYSTSEP
Signal strength separator for high and low signal strength cells
0 to 150 dbm
90 dBm

OFFSET
Signal strength offset
 -63 to 63 db
0
The parameter is represented by OFFSETN, if the value is in the range (−63, -1) dB. Positive values, (0, 63) dB, is represented by OFFSETP.