Cell ID in GSM / UMTS / LTE

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tong
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Cell ID in GSM / UMTS / LTE

Post by tong »

2G / GSM

Normally, Location Area Code (LAC) will be used with Cell ID which size 16 bits (0 - 65535)
gsm.png
tong
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Posts: 2328
Joined: Fri 01 May 2009 8:55 pm

Re: Cell ID

Post by tong »

3G / UMTS

Normally, Location Area Code (LAC) will be used with Cell ID which have 2 types.
So it's very confuse to us.

Long Cell ID or UTRAN Cell ID (28 bits) = Radio Network Controller ID (12 bits) + Short Cell ID (16 bits)
Cell_UMTS.png 2015-10-23-17-14-24.png Example:

RNC = RNC ID = 365
CID = Short Cell ID = 5486
LCID = UTRAN Cell ID = 23926126 = (365 x 65536) + 5486
tong
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Re: Cell ID

Post by tong »

4G / LTE

Normally, Tracking Area Code (TAC) will be used with Long Cell ID.

Long Cell ID or E-UTRAN Cell ID (28 bits) = eNodeB ID (20 bits) + Short Cell ID (8 bits)
Cell_LTE.png Screenshot_2015-10-23-16-51-56-553.jpg Example:

eNBI = eNodeB ID = 1630
CLID = Short Cell ID = 2
ECI = E-UTRAN Cell ID = 417282 = (1630 x 256) + 2

Can be written as the pattern = 1630.2
tong
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Re: Cell ID ในระบบ GSM / UMTS / LTE

Post by tong »

PLMN ID = Public Land Mobile Network Identifier; Unique identification of PLMN; (max 6 digits)
PLMN ID = MCC + MNC

	MCC = Mobile Country Code; assigned by ITU; (3 digits)
	MNC = Mobile Network Code; assigned by National Authority; (2~3 digits)

IMSI = International Mobile Subscriber Identity; Unique identification of mobile (LTE) subscriber; (max 15 digits)
IMSI = PLMN ID + MSIN

	MSIN = Mobile Subscriber Identification Number; assigned by operator; (9~10 digits)

TAI = Tracking Area Identity; To identify Tracking Area (Globally unique); (max 32 bits)
TAI = PLMN ID + TAC

	TAC = Tracking Area Code; To indicate eNB to which Tracking Area (Unique within a PLMN); (16 bits)

ECGI = E-UTRAN Cell Global Identifier; To identify a Cell in global (Globally Unique); (max 52 bits)
ECGI = PLMN ID + ECI

	ECI = E-UTRAN Cell Identifier; To identify a Cell within a PLMN; (28 bits)
	ECI = eNB ID + Cell ID

		eNB ID = eNodeB Identifier; To identify an eNB within a PLMN; (20 bits)
		Cell ID = CELL identifier; serves to uniquely identify a cell within eNB; (8 bits)

Global eNB ID = Global eNodeB Identifier; To identify an eNB in global (Globally Unique); (max 44 bits)
Global eNB ID = PLMN ID + eNB ID
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