NITZ (Network Information and Time Zone)
Network Name displayed on your mobile phone screen is determined by two different way as described below :
Option 1: UE decode PLMN from Location Updating Accept or Attach Accept message and display the network name registered for the PLMN.
Option 2 : Network explicitely notifies UE of Network Information by NAS message, MM:Information and/or GMM:Information as described in this page.
Whether to take Option 1 or Option 2 is up to Network Operator's implementation and the exact point of the NAS message if Option 2 is taken is also up to Network Operator's implementation. The protocol sequence for a registration for Option 2 is only an example. The exact sequence would vary depending on each network operator.
1) MIB
2) SIB
3) RACH Preamble
4) AICH
5) RACH Message
6) RRC: RRC Connection Request
7) RRC: RRC Connection Setup
8) RRC: RRC Connection Setup Complete
9) RRC: initialDirectTransfer + MM: Location Updating Request
10) RRC : downlinkDirectTransfer + MM:Authentication Request
11) RRC: initialDirectTransfer + GMM: Attach Request
12) RRC : uplinkDirectTransfer + MM:Authentication Response
13) RRC : Security Mode Command
14) RRC : Security Mode Complete
15) RRC : downlinkDirectTransfer + MM:Identity Request
16) RRC : uplinkDirectTransfer + MM:Identity Response
17) RRC : downlinkDirectTransfer + MM:Location Updating Accept
18) RRC : uplinkDirectTransfer + MM:TMSI Reallocation Complete
19) RRC : downlinkDirectTransfer + MM:Information
20) RRC : downlinkDirectTransfer + GMM: AuthenticationAndCipheringRequest
21) RRC : uplinkDirectTransfer + GMM: AuthenticationAndCipheringResponse
22) RRC : Security Mode Command
23) RRC : Security Mode Complete
24) RRC : downlinkDirectTransfer + GMM:Identity Request
25) RRC : uplinkDirectTransfer + GMM:Identity Response
26) RRC : downlinkDirectTransfer + GMM:Attach Accept
27) RRC : uplinkDirectTransfer + GMM:Attach Complete
28) RRC : downlinkDirectTransfer + GMM:Information
29) RRC : RRC Connection Release
30) RRC : RRC Connection Release Complete
19) RRC : downlinkDirectTransfer + MM:Information
DL-DCCH-Message
integrityCheckInfo
messageAuthenticationCode: 1e45b70e
rrc-MessageSequenceNumber: 2
message: downlinkDirectTransfer (5)
downlinkDirectTransfer: r3 (0)
r3
downlinkDirectTransfer-r3
rrc-TransactionIdentifier: 1
cn-DomainIdentity: cs-domain (0)
nas-Message: 05324312834d228e76ab0523d376584e9fd2ebe4f41b4508...
GSM A-I/F DTAP - MM Information
Protocol Discriminator: Mobility Management messages
.... 0101 = Protocol discriminator: Mobility Management messages (0x05)
0000 .... = Skip Indicator: No indication of selected PLMN (0)
00.. .... = Sequence number: 0
..11 0010 = DTAP Mobility Management Message Type: MM Information (0x32)
Network Name - Full Name
Element ID: 0x43
Length: 10
1... .... = Extension: No Extension
.000 .... = Coding Scheme: Cell Broadcast data coding scheme,
GSM default alphabet, language unspecified, ....
.... 0... = Add CI: The MS should not add the letters
for the Country's Initials to the text string
.... .011 = Number of spare bits in last octet:
bits 6 to 8(inclusive) are spare and set to '0' in octet n
Text String: TestNetwork
Network Name - Short Name
Element ID: 0x45
Length: 4
1... .... = Extension: No Extension
.000 .... = Coding Scheme: Cell Broadcast data coding scheme,
GSM default alphabet, language unspecified, ....
.... 0... = Add CI: The MS should not add the letters
for the Country's Initials to the text string
.... .000 = Number of spare bits in last octet:
this field carries no information about the number of spare bits ...
Text String: Test
Time Zone and Time - Universal Time and Local Time Zone
Element ID: 0x47
Year 14, Month 03, Day 25
Hour 04, Minutes 17, Seconds 09
Timezone: GMT - 5 hours 0 minutes
Daylight Saving Time
Element ID: 0x49
Length: 1
0000 00.. = Spare bit(s): 0
.... ..00 = No adjustment for Daylight Saving Time
28) RRC : downlinkDirectTransfer + GMM:Information
DL-DCCH-Message
integrityCheckInfo
messageAuthenticationCode: 1905f951
rrc-MessageSequenceNumber: 6
message: downlinkDirectTransfer (5)
downlinkDirectTransfer: r3 (0)
r3
downlinkDirectTransfer-r3
rrc-TransactionIdentifier: 1
cn-DomainIdentity: ps-domain (1)
nas-Message: 08214312834d228e76ab0523d376584e9fd2ebe4f41b4508...
GSM A-I/F DTAP - GMM Information
Protocol Discriminator: GPRS mobility management messages
.... 1000 = Protocol discriminator: GPRS mobility management messages (0x08)
0000 .... = Skip Indicator: No indication of selected PLMN (0)
DTAP GPRS Mobility Management Message Type: GMM Information (0x21)
Network Name - Full Name
Element ID: 0x43
Length: 10
1... .... = Extension: No Extension
.000 .... = Coding Scheme: Cell Broadcast data coding scheme,
GSM default alphabet, language unspecified, ....
.... 0... = Add CI: The MS should not add the letters
for the Country's Initials to the text string
.... .011 = Number of spare bits in last octet:
bits 6 to 8(inclusive) are spare and set to '0' in octet n
Text String: TestNetwork
Network Name - Short Name
Element ID: 0x45
Length: 4
1... .... = Extension: No Extension
.000 .... = Coding Scheme: Cell Broadcast data coding scheme,
GSM default alphabet, language unspecified, ...
.... 0... = Add CI: The MS should not add the letters
for the Country's Initials to the text string
.... .000 = Number of spare bits in last octet:
this field carries no information about the number of spare bits ...
Text String: Test
Time Zone and Time
Element ID: 0x47
Year 14, Month 03, Day 25
Hour 04, Minutes 17, Seconds 10
Timezone: GMT - 5 hours 0 minutes
Daylight Saving Time
Element ID: 0x49
Length: 1
0000 00.. = Spare bit(s): 0
.... ..00 = No adjustment for Daylight Saving Time