Data 85 (Registered Cell)

The current network registration information.

The frame format of the Data 85 unit is as follows:

For example (Total 16 bytes):
55 0E 06 04 BC 8A 00 10 00 02 10 00 10 0C 13 03

Parts

Fields

Length (Byte)

Range/Format

Default

ID

Data ID

1

55H (85)

55H (85)

Length

Data Length

1

00H or 0EH

Content

PLMN

4

LAC

2

0000H-FFFFH

Cell ID

4

00000000H-0FFFFFFFH

Access Technology & Roaming

1

Band

1

CSQ RSSI

1

00H-1FH, 63H

Bit Error Rate

1

00H-07H, 63H

  • PLMN

    Public Land Mobile Network, composed by MCC (Mobile Country Code) and MNC (Mobile Network Code).

    The first byte (the highest byte) represents the length of the PLMN, and the next 3 bytes are the hexadecimal expression of the PLMN converted to an integer.

    For example, 0500B3B1H means PLMN “46001”, and 0604BC8AH means PLMN “310410”.

  • LAC

    Location Area Code in hexadecimal format.

    For example, 0010H means LAC “0010”.

  • Cell ID

    Cell ID in hexadecimal format.

    For example, 00021000H means Cell ID “00021000”.

  • Access Technology & Roaming

    The upper 1 bit represents roaming status and the lower 7 bits represent access technology.

    • Roaming (Bit7)

      • 0b0 - Registered to the home network.

      • 0b1 - Registered to a roaming network.

    • Access Technology (Bit6 to Bit0)

      • 0b0000000 - GSM

      • 0b0000001 - UMTS

      • 0b0000101 - LTE Cat-1

      • 0b0010000 - LTE Cat-M1

      • 0b0010010 - LTE Cat-NB2

  • Band

    If the value of ‘Access Technology’ is GSM or UMTS, the meaning of this field is as follows:

    • 00H - 800MHz

    • 01H - 850MHz

    • 02H - 900MHz

    • 03H - 1800MHz

    • 04H - 1900MHz

    • 05H - 2100MHz

    If the value of ‘Access Technology’ means “LTE X”, this field indicates the LTE Band. For example, 05H indicates Band5, 0CH indicates Band12, and 14H indicates Band20.

    Note: In particular, FFH means taht the terminal can not obtain the Band value.

  • CSQ RSSI

    The received signal strength:

    CSQ RSSI

    Signal Strength (dBm)

    00H (0)

    -113 or less

    01H (1)

    -111

    02H to 1EH (2 to 30)

    -109 to -53

    1FH (31)

    -51 or greater

    63H (99)

    Not known or not detectable

  • Bit Error Rate

    Channel bit error rate (in percent). In particular, 63H (i.e. 99) means “Not known or not detectable”.