Pci planning

PCI Planning

Motivation Inappropriate PCI Planning, result in signifcant KPI degradation

Motivation Inappropriate PCI Planning, result in signifcant KPI degradation

Motivation: PCI Planning in nutshell 1. Avoid assigning the same same PCI PCI to neighbour cells Id = 0

2.

Avoid assigning the same mod !PCI" to #neighbour$ cells

Id = 2

Id = 6 Id = 8

Id = 1

.

Avoid assigning the same mod%!PCI" to #neighbour$ cells

Id = 3 Id = 5

Id = 11 Id = 4

&. Avoid Avoid assign assigning ing the same same mod' mod' !PCI" !PCI" to #neighbour$ cells

(h)* (hat are the reasons behind these* (hat is PCI at all* +o, e need to e-plain some related basic concepts

Id = 7 Id = 9

Id = 10

/0 Multiple Access /echnolog)

In OFDM:  Overlapping carriers increases special



efficiency compared to conventional FDM Orthogonality between carriers



Parallel transmission of payload across



multiple Simple rectangular pulse during



modulation period

/0 Multiple Access /echnolog) le-ibilit) to assign resource more ecient

/0 rame +tructure: 33

/0 rame +tructure: /33

4ormal and 0-tended CP in /0

/0 5esource +tructure

/0 5esource +tructure 





/he cell6specifc 5+s enable the 70 to determine the phase re8erence 8or demodulating the donlin9 control channels and the donlin9 data in most transmission modes1 o8 the Ph)sical 3onlin9 +hared Channel. 5+5P is measured b) the 70 over the cell6specifc 5e8erence +ignals !5+s" ithin the measurement bandidth over a measurement period. 5+5P is a t)pe o8 signal strength measurement and is indicative o8 the cell coverage. 5+5P is the most important criteria 8or cell selectionreselection and handover +ingle decisions, coverage anal)sis /o Antenna Antenna

/0 ;andidth In contrast to 9, /hen I have more ?uestions* 16 @o does 70 9no these in8ormation* @o 70 detect the 33 and /33* @o 3oes 70 9no that CP is normal or e-tended* 26 here 70 ind this basic in8ormation, here it does not 9no the bandidth be8ore* 6 Again (hat is PCI* (hat is it

P++ and +++ At frst, 70 need to s)nchroniBe ith 3onlin9 radio s)mbols and 8rame in order to get in8ormation. /o achieve that, to s)nchroniBation signals are broadcasted b) the e4ode;:  Primary Synchronization Signal , PCI6 I3 !P++" It is present in sub8rames ' and D !>3M s)mbol %" and is mapped on E2 subcarriers in the middle o8 the band. rom P++, the 70 is also able to obtain ph)sical la)er identit) !' to 2". It is used to detect the carrier 8re?uenc) and the +C@ s)mbol timing.  Secondary Synchronization Signal, PCI- group (SSS) It is present in sub8rame ' and D !>3M s)mbol D", and is also /he good nes these basic in8ormation independent o8 +++ is mapped on is E2that, subcarriers in the middle are o8 the band. /he s)stem bandidth.number !' to 1%E". 1%F se?uence It is used to s)nchroniBe the 70 to the 8rame timing.

/I 5esource