rf optimization some key concepts
TRANSCRIPT
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SOME KEY CONCEPTS USEFUL FOR OPTIMIZATION
1.If on a congested place we are not getting good indoor coverage but outdoor coverage is
good then we prefer to put mechanical tilts rather than electrical.
2.If we are getting the BCCH of say sec. A in direction of sec. C of the same site then it
means sectors are swapped.
3.If we are getting handover say in sec. A from sec. C i.e. getting both in the main lob of
one, then it means there is mutual swapping of only either DX1 or DX2 of sec. A & C.
4.If we are getting voice cracks and bad quality in a sector then check out for interference.
5.If not getting a good expected coverage in serving area though there is no obstruction in
front of antenna then check out that antenna is mounted properly and there should not be
much slant in the antenna.
6.If other things are fine and still we are not getting the coverage and call drops in a
particular sector then check whether the jumpers are properly screwed on the top of
CDU's in RBS.
7.One more possibility of not getting coverage of the particular sector in front of antenna is
due to the problem in hardware (either in TRU or in antenna).
8.If in a sector, if there is no interference and still we are getting bad quality and voice
cracks, with FER having high values tends to call drops, near to the site then there is
possibility that TRU may be faulty.
9.If on a place you are getting signal from a distant sector even though the sector is having
max. down tilts then check whether it is serving on some water body, water helps signal
to escalate up to long distances due to reflection.
10. Always try that sector should not serve directly on a big water body.
11. If getting high TCH and SD drops in the sector then screw it down.
12. If there is a situation you are getting continuous handover failures say sec. 1A to 5B then
check 3B should not have the same BSIC & BCCH as 5B, where 3B is also a neighbor of
1A.
13. If getting bad quality and interference on hopping then check out whether there is clash of
the same MAIO from the same group of sectors.
14. If a new site is not giving handovers to other sites then check out whether handovers are
defined properly and the MBCCH NO. are defined in the neighbors list of the cell.
15. If point 14 is ok and still handovers are not happening then check out that correct values
of NCCPERM are defined or not.
As a good RF engineer always try to optimize the existing network to solve the problems
rather then suggesting to put a new site or changing the frequency to reduce the
interference, always keep these as last weapon.
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16. the cause of call drop could be penetration hole. you can avoid it through repeaters
17. the case of call drop could be neighbor list absent in the list
18. the hardware problem could be the cause of call drop
19. rx level is not good that could be a cause of call drop.