2010
Mohaned Yousef Ismail Yousef Telecommunication Engineer
Drive Test problems (2G,3G)
Mohaned Yousef Ismail Yousef E-mail:
[email protected] Mobile : +2 0104585755
Mohaned Yousef Ismail Yousef Telecom engineer Problem No.1
Different LAC [location area code] (2G). How I can find it : By looking at [GSM current channel] window , I will see that my site have different LAC from its neighbors. How it can be solved : Tell the operator about that problem and they will change it to the right one.
Problem No.2
Shifted azimuth (2G,3G) How I can find it : from the coverage area of the site I find that the azimuth of that site is not logical. How it can be solved : Tell the Technician to check the azimuth of the sectors to be similar to the planned azimuth.
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Drive Test problems (2G & 3G)
Mohaned Yousef Ismail Yousef Telecom engineer Problem No.3
Handover failure (2G) How I can find it : it happens when a sector in a site is not defined for the other sites around it. How it can be solved : report that to the operator and they will define the sectors to each other and solve the problem.
Problem No.4
Overshooting How I can find it : I will find in the coverage region of a site which should be serve it with good level ,that there are another site server in it with good level and it may cause interference. How it can be solved : down tilt the site which overshoot in that region to avoid interference.
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Drive Test problems (2G & 3G)
Mohaned Yousef Ismail Yousef Telecom engineer Problem No.5
Gaps (2G) How I can find it : When I test the coverage on a main road sometimes I find a gap between 2 sites because there are far away from each other or one of them is down tilt. How it can be solved : by up tilting one of them to serve this gap.
Problem No.6
Hopping channels problems (2G) How I can find it : In 2G, sometimes the hopping channels technique doesn’t work and I find that from the [hopping channel] window. How it can be solved : Call the integrator to fix this problem.
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Drive Test problems (2G & 3G)
Mohaned Yousef Ismail Yousef Telecom engineer Problem No.7
Site down (2G,3G) How I can find it : when i call the front office to activate a site it may be down for 2 reasons , down for transmission [E1 down] or power reason. How it can be solved : Report that to the operator to solve the problem by check E1 connection or power of the site.
Problem No.8
Connectivity problem (2G,3G) How I can find it : connectivity problems cause bad level , bad quality ,bad coverage area and blocked calls. How it can be solved: tell technician to check feeders ,connectors and jumbers.
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Drive Test problems (2G & 3G)
Mohaned Yousef Ismail Yousef Telecom engineer Problem No.9
Wrong configuration (2G) How I can find it : I notice that from the [hopping channels] window that the real configuration different from the planed configuration. How it can be solved : Tell the operator to modify the TCHs to be as the planned.
Problem No.10
Ping pong handover (2G) How I can find it : it happens when there are a small region all sites serve it with the same level so the MS will handle between them quickly and this may cause dropped calls. How it can be solved : Tell the operator to solve this problem by down tilt some sites and reduce other sites .
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Drive Test problems (2G & 3G)
Mohaned Yousef Ismail Yousef Telecom engineer Problem No.11
Blocked calls (2G,3G) How I can find it : It happens due to RACCH error [due to high traffic] or connectivity problem, How it can be solved : Tell technical to check connectivity.
Problem No.12
No RRC Connection setup (3G) How I can find it : in this case, I can’t access on that site due to hardware problem. How it can be solved: Tell technical team to solve that problem.
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Drive Test problems (2G & 3G)
Mohaned Yousef Ismail Yousef Telecom engineer Problem No.13
Cross sector [2G, 3G] . How I can find it : two different sectors in the same site serve in the each other area. It happens when the 2 feeders of the TRUs of 2 antennas inversed with each other. How it can be solved : Tell the technical team to inverse the input feeders of these antennas to solve this problem.
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Drive Test problems (2G & 3G)
Mohaned Yousef Ismail Yousef Telecom engineer Problem No.14
Cross feeder [2G] How I can find it : As an example in site with 2 sectors, I will find that sector A serve in its region and in Sector B region too and the RxLevel will be almost the same in the to regions. It happens when one feeder is inversed in the 2 antennas with each other. How it can be solved : Tell the technical team to inverse the input feeder of these antennas to solve this problem and inform them that there are a cross feeder problem.
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Drive Test problems (2G & 3G)
Mohaned Yousef Ismail Yousef Telecom engineer Problem No.15
VSWR [Voltage standard wave ratio] [2G] How I can find it : Under the site we must see the levels of all sectors is the best, when I find Rx-Level of one of the sectors is bad so it will be VSWR problem [connectivity problem]. How it can be solved : Tell the technical team that there are VSWR , please check connectivity
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Drive Test problems (2G & 3G)
Mohaned Yousef Ismail Yousef Telecom engineer Problem No.16
Faulty DTRU [2G] How I can find it : In the main beam of a sector [In dedicated mode] the TCH channels must be in good levels.. when a level of a TCH is bad , so it’s a faulty DTRU. How it can be solved: Replace the DTRU that have a problem by new one.
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Drive Test problems (2G & 3G)
Mohaned Yousef Ismail Yousef Telecom engineer Problem No.17
Disconnected DTRU [2G] How I can find it : Before doing any acceptance for any 2G site . I must know the configuration of that site .As an example if the configuration of Cell E is 4 TCH 1800 Band and I found it 3 TCHs and I check with integrator and he tell me that there is not any problem in the assigned frequencies so there is a disconnected DTRU. How it can be solved : Tell the technician that there is a disconnected DTRU on Cell E and he will solve the problem.
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Drive Test problems (2G & 3G)
Mohaned Yousef Ismail Yousef Telecom engineer
Problem No.18 Co-channel interference How I can find it : By looking at [hopping channel] window I can fine the C/I [carrier over interference ratio] is bad . The Co-channel interference happens when there are two frequencies [the same] interfere with each other. How it can be solved : Tell the operator about that frequency and the will solve the problem. Problem No.19 Adjacent interference How I can find it : By looking at [hopping channel] window I can fine the C/I [carrier over interference ratio] is bad . The Adjacent interference happens when there are two frequencies [closed together] interfere with each other. How it can be solved : Tell the operator about that 2 frequencies and the will solve the problem.
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Drive Test problems (2G & 3G)
Mohaned Yousef Ismail Yousef Telecom engineer
Problem No.20
Handover intracell failure (2G) How I can find it : in TEMS this alert will appear in Events window How it can be solved : there is no synchronization between 900 TCHs and 1800 TCHs cabins ,So the technical will solve that problem by make synchronization between them by help from the integration office.
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Drive Test problems (2G & 3G)
Mohaned Yousef Ismail Yousef Telecom engineer
Problem No.21
Wrong position ( Wrong Lat & Long) How I can find it : go to the given co-ordinates and I didn’t find the site . [Survey team mistake] How it can be solved : search for the site in the field around the wrong co-ordinates region .
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Drive Test problems (2G & 3G)
Mohaned Yousef Ismail Yousef Telecom engineer
Problem No.22
Missing neighbor relations. [3G] How I can find it : in TEMS this alert will appear in Events window and it happens when 2 sites neighbors and didn’t defined to each other. How it can be solved : Tell the operator by the missing neighbors data and the problem will be solved
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Drive Test problems (2G & 3G)
Mohaned Yousef Ismail Yousef Telecom engineer
Problem No.23
HSDPA failed. [3G] How I can find it : the average speed of HSDPA through put speed didn’t reach for the acceptable range. How it can be solved : it is a problem in hardware or in integration .
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Drive Test problems (2G & 3G)
Mohaned Yousef Ismail Yousef Telecom engineer
Problem No.24
Shifted azimuth (2G,3G) How I can find it : It appears from the illogical coverage area of the sector which have shifted azimuth. How it can be solved : I ask for the real azimuth and modify it.
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Drive Test problems (2G & 3G)
Mohaned Yousef Ismail Yousef Telecom engineer
Problem No.25
IRAT failed ( 3G-2G) How I can find it : in dedicated mode , when the call have very bad RSCP and EcNo in 3G, it must go to 2G . If it wasn’t happened so IRAT failed. How it can be solved : The integration office will solve this problem.
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Drive Test problems (2G & 3G)
Mohaned Yousef Ismail Yousef Telecom engineer
Problem No.26
Reselection Failed(2G-3G) How I can find it : In idle mode, the priority for 3G . if we are on 2G in idle mode and it does not go to 3G so reselection failed. How it can be solved : The integration office will solve this problem.
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Drive Test problems (2G & 3G)
Mohaned Yousef Ismail Yousef Telecom engineer
Problem No.27
Dropped Calls . How I can find it : it happens due to bad level and quality . How it can be solved : Report the operator about this problem after analyzing it ,depending on its case.
Problem No.28
Bad coverage area due to wrong tilts How I can find it : in the field I will find poor coverage of a sector so there will be a tilts problems [ down tilt] How it can be solved : Tell the Technician to uptilt that sector to get the required coverage area.
Problem No.29
PS [packet switching] doesn’t initiate. How I can find it : when I test the PS browsing of any 2G site , it doesn’t initiate according to hardware problem or integration problem. How it can be solved : Check with integration and if there are a problem there so it will be hardware problem solved by technical team.
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Drive Test problems (2G & 3G)
