Physical Cell ID (PCI) Planning

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Physical Cell ID (PCI) Planning www.huawei.com

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Objective • Reduce the possibility of Physical Cell Id conflicts which is usually the case when PCI’s are planned without consideration for the propagation environment.  

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Prevent cells with the same PCI from overlapping Takes into consideration the neighbor cell relationship in the assignment of PCIs Provide a method for reserving codes for use with new LTE infill sites, indoor system, etc Forces the re-use of codes to be spread over distance Forcers a uniform use of codes in the network

Overview of Physical Cell IDs  The cell identity is a global cell ID that is used to identify the cell from an OAM perspective.  The physical cell identity has a range of 0 to 503 (total of 504 PCIs) and it is used to scramble the data to help the UE separate information from the different cells.  The Physical Cell ID determines the primary and secondary sync signal sequence.  Primary Synchronization Signal ID (PSS ID) is in the range from 0 to 2  Secondary Synchronization Signal ID (SSS ID) is in the range from 0 to 167. This is what constitutes the physical layer cell identity groups.  Physical Cell ID = PSS ID + 3*SSS ID HUAWEI TECHNOLOGIES CO., LTD.

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Allocated PCI Groups and Reserved Codes The following are the customized PCI groups and the set of reserved codes in each of the groups: Group 1: 0 - 125 Group 2: 126 - 251 Group 3: 252 - 377 Group 4: 378 – 503

The corresponding reserved codes for each group are as follows: Group 1 Reserved Codes: 105 - 125 Group 2 Reserved Codes: 231 - 251 Group 3 Reserved Codes: 357 - 377 Group 4 Reserved Codes: 482 - 503

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Code Groups and Reserved Codes per Group

Each group allow planning for 35 sites / 3 sectors. 21 reserved PCI per group are to be used only within the geographic area where the specific code group is used.

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Illustrative Description of Group based PCI Planning AREA 1

AREA 8 AREA 5

AREA 9 AREA 11 AREA 6

AREA 2 AREA 4

AREA 10

AREA 3

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AREA 12 AREA 7

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