Tech-invite3GPPspecsSIPRFCs
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Content for  TS 31.102  Word version:  17.1.0

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4.4.3  Contents of files at the DF GSM-ACCESS level (Files required for GSM Access)Word‑p. 148
UICC File Structure: DF-GSM-ACCESS under Universal Subscriber Identity Module (USIM) application, as well as DF-TELECOM, according to 3GPP TS-31.102
The EFs described in this clause are required for the USIM application to be able to access service through a GSM network.
The presence of this DF and thus the support of a GSM access is indicated in the 'USIM Service Table' as service no. '27' being available.
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4.4.3.1  EFKc (GSM Ciphering key Kc)Word‑p. 149
If service No. 27 is "available", this file shall be present.
This EF contains the ciphering key Kc and the ciphering key sequence number n for enciphering in a GSM access network.
Identifier: '4F20'Structure: transparentOptional
SFI: '01'
File size: 9 bytesUpdate activity: high
Access Conditions:
READPIN
UPDATEPIN
DEACTIVATEADM
ACTIVATEADM
Bytes Description M/O Length
1 to 8Ciphering key KcM8 bytes
9Ciphering key sequence number nM1 byte
Ciphering key Kc
Coding:
the least significant bit of Kc is the least significant bit of the eighth byte. The most significant bit of Kc is the most significant bit of the first byte.
Ciphering key sequence number n
Coding:
b8 b7 b6 b5 b4 b3 b2 b1
bits b4 to b8 are coded 0 N
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4.4.3.2  EFKcGPRS (GPRS Ciphering key KcGPRS)

If service No. 27 is "available", this file shall be present.
This EF contains the ciphering key KcGPRS and the ciphering key sequence number n for GPRS (see TS 23.060).
Identifier: '4F52'Structure: transparentOptional
SFI: '02
File size: 9 bytesUpdate activity: high
Access Conditions:
READPIN
UPDATEPIN
DEACTIVATEADM
ACTIVATEADM
Bytes Description M/O Length
1 to 8Ciphering key KcGPRSM8 bytes
9Ciphering key sequence number n for GPRSM1 byte
Ciphering key KcGPRS
Coding:
the least significant bit of KcGPRS is the least significant bit of the eighth byte. The most significant bit of KcGPRS is the most significant bit of the first byte.
Ciphering key sequence number n for GPRS
Coding:
b8 b7 b6 b5 b4 b3 b2 b1
bits b4 to b8 are coded 0 n
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4.4.3.3Void

4.4.3.4  EFCPBCCH (CPBCCH Information)Word‑p. 150
If service No. 39 is "available", this file shall be present.
This EF contains information concerning the CPBCCH according to TS 44.018.
CPBCCH storage may reduce the extent of a Mobile Station's search of CPBCCH carriers when selecting a cell. The CPBCCH carrier lists shall be in accordance with the procedures specified TS 43.022. The MS stores CPBCCH information (from the System Information 19 message, Packet System Information 3, and Packet System Information 3 bis) on the USIM. The same CPBCCH carrier shall never occur twice in the list.
Identifier: '4F63'Structure: transparentOptional
File size: 2n bytesUpdate activity: high
Access Conditions:
READPIN
UPDATEPIN
DEACTIVATEADM
ACTIVATEADM
Bytes Description M/O Length
1 to 2Element 1 of CPBCCH carrier listM2 bytes
2n-1 to 2nElement n of CPBCCH carrier listM2 bytes
Element in CPBCCH carrier list
Coding:
Byte 1: first byte of CPBCCH carrier list element
b8 b7 b6 b5 b4 b3 b2 b1
LSB of ARFCN
 
Byte 2: second byte of CPBCCH carrier list element
b8 b7 b6 b5 b4 b3 b2 b1
Empty indicator bits b4 to b7 are RFU High/Low band indicator MSB of ARFCN
 
ARFCN (10 bits) as defined in TS 45.005
  • High/Low band indicator: If the ARFCN indicates possibly a channel in the DCS 1800 or a channel in the PCS 1900 band, if the bit is set to '1' the channel is in the higher band (GSM 1900). If the bit is set to '0', the lower band (GSM 1800) is indicated. If ARFCN indicates a unique channel, this indicator shall be set to '0'.
  • Empty indicator: If this bit is set to '1', no valid CPBCCH carrier is stored in this position. If the Empty Indicator is set to '1', the content of the CPBCCH carrier field shall be ignored. The empty indicator shall also be used, and set to '1', if storage of fewer than maximum number n, of CPBCCH carrier fields is required.
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4.4.3.5  EFInvScan (Investigation Scan)Word‑p. 151
If service No. 40 is "available", this file shall be present.
This EF contains two flags used to control the investigation scan for higher prioritized PLMNs not offering voice services.
Identifier: '4F64'Structure: transparentOptional
File size: 1 byteUpdate activity: low
Access Conditions:
READPIN
UPDATEADM
DEACTIVATEADM
ACTIVATEADM
Bytes Description M/O Length
1Investigation scan flagsM1 byte
Investigation scan flags
Coding:
b8 b7 b6 b5 b4 b3 b2 b1
Bits b3 to b8 are coded RFU After successful PLMN selection In limited service mode
 
A '1' in a bit position indicates that the investigation scan shall be performed for the condition corresponding to that bit position and a '0' that it shall not be performed.
If this elementary file is not present, no investigation scan shall be performed.
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