LTE band lock

Frequency band lock

Frequency bands can be locked with the AT+QCFG=“band” command. The syntax for the command looks like this:

gsmctl -A 'AT+QCFG=“band”[,<bandval>,<ltebandval>,<tdsbandval>[,<effect>]]'

Where:

• <bandval> - a hexadecimal value that specifies the GSM and WCDMA frequency band. Possible values are:

  00000000    No change
  00000001    GSM900
  00000002    GSM1800
  00000004    GSM850
  00000008    GSM1900
  00000010    WCDMA 2100
  00000020    WCDMA 1900
  00000040    WCDMA 850
  00000080    WCDMA 900
  00000100    WCDMA 800
  00000200    WCDMA 1700
  0000FFFF    Any frequency band

• <ltebandval> - A hexadecimal value that specifies the LTE frequency band. Possible values are:

  0                No change
  0x1              (CM_BAND_PREF_LTE_EUTRAN_BAND1)     LTE BC1 (2100MHz)
  0x4              (CM_BAND_PREF_LTE_EUTRAN_BAND3)     LTE BC3 (1800MHz)
  0x10             (CM_BAND_PREF_LTE_EUTRAN_BAND5)     LTE BC5 (850MHz)
  0x40             (CM_BAND_PREF_LTE_EUTRAN_BAND7)     LTE BC7 (2600MHz)
  0x80             (CM_BAND_PREF_LTE_EUTRAN_BAND8)     LTE BC8 (900MHz)
  0x800000         (CM_BAND_PREF_LTE_EUTRAN_BAND20)    LTE BC20 (800MHz)
  0x40000000       No change
  0x1a0000800d5    (CM_BAND_PREF_ANY)                  Any frequency band

• <tdsbandval> - a hexadecimal value that specifies the TDS-CDMA frequency band. Possible values are:

  0             No change
  0x1           (CM_BAND_PREF_TDS_BANDA)    TDS BCA
  0x2           (CM_BAND_PREF_TDS_BANDB)    TDS BCB
  0x4           (CM_BAND_PREF_TDS_BANDC)    TDS BCC
  0x8           (CM_BAND_PREF_TDS_BANDD)    TDS BCD
  0x10          (CM_BAND_PREF_TDS_BANDE)    TDS BCE
  0x20          (CM_BAND_PREF_TDS_BANDF)    TDS BCF
  0x40000000    No change

• <effect> - specifies when to take effect. Possible values are:

  0    Take effect after reboot
  1    Take effect immediately

Examples

---

gsmctl -A 'AT+QCFG="band",0,40,0,1'

3. Start mobile data connection:

   ifup ppp

Additionally:

To read used frequencies:

   gsmctl -A 'AT+QCFG="band"'

   +QCFG: "band",0xd3,0x40,0x0

To read used frequencies in words format:

   gsmctl -A AT+QNWINFO

to set exact bands:

   gsmctl -A 'AT+QCFG="band",0,40,0,1'

   OK   

Multiple frequencies at one time:

It's not force one band, when you use AT+QCFG="band" and set

any combinations of band you need to use, for <ltebandval> 1800 is band 3,

and it's config is 4, and 2600 is band 7, it's config is 40, so you sum this

two and it will be 44, so you need to set <ltebandval> as 44.