modem network drop to 3G from LTE, but can't back to LTE network

[dailijin]

Hey,

Thanks your reply. 


On my test machines, I plugin three MC7354 modem and the details s below:


Slot 1: MC7354 - 1102225:   VZW Sim,          Firmware: 05.05.16.03
Slot 2: MC7354 - 1102016:   T-MOBILE SIM   Firmware:  05.05.16.02 
Slot 3: MC7354 - 1102016:   ATnT Sim           Firmware: 05.05.16.02


They work on LTE at the beginning, after run 12 hours, the slot 2 modem will drop to UMTS and always can't back to LTE mode.


For the modem in slot 2, the output which you mention as below, it work on UMTS now.
tvupack TVUTransporter # qmicli  -d /dev/cdc-wdm1   --nas-get-system-selection-preference
[/dev/cdc-wdm1] Successfully got system selection preference
        Emergency mode: 'no'
        Mode preference: 'cdma-1x, cdma-1xevdo, gsm, umts, lte'
        Band preference: 'gsm-dcs-1800, gsm-900-extended, gsm-900-primary, gsm-850, gsm-pcs-1900, wcdma-2100, wcdma-pcs-1900, wcdma-850-us, wcdma-800, wcdma-900'
        LTE band preference: '2, 4, 5, 17'
        TD-SCDMA band preference: 'a, b, c, d, e, f'
        CDMA PRL preference: 'any'
        Roaming preference: 'any'
        Network selection preference: 'automatic'
        Service domain preference: 'cs-ps'
        Service selection preference: 'automatic'


tvupack TVUTransporter # qmicli  -d /dev/cdc-wdm1   --nas-get-technology-preference
[/dev/cdc-wdm1] Successfully got technology preference
        Active: 'auto', duration: 'permanent'


tvupack TVUTransporter # qmicli  -d /dev/cdc-wdm1   --nas-get-system-info
[/dev/cdc-wdm1] Successfully got system info:
        CDMA 1x service:
                Status: 'none'
                Preferred data path: 'no'
        CDMA 1xEV-DO (HDR) service:
                Status: 'power-save'
                Preferred data path: 'no'
        GSM service:
                Status: 'none'
                True Status: 'none'
                Preferred data path: 'no'
        WCDMA service:
                Status: 'available'
                True Status: 'available'
                Preferred data path: 'no'
                Domain: 'cs-ps'
                Service capability: 'cs-ps'
                Roaming status: 'off'
                Forbidden: 'no'
                Location Area Code: '40495'
                Cell ID: '39627181'
                MCC: '310'
                MNC: '260'
                HS call status: '(null)'
                HS service: '(null)'
                Primary scrambling code: '142'
                Cell broadcast support: 'off'
                Call barring status (CS): 'all-calls'
                Call barring status (PS): 'all-calls'
                Cipher Domain: 'ps'
        LTE service:
                Status: 'none'
                True Status: 'none'
                Preferred data path: 'no'
        SIM reject info: 'vailable'


tvupack TVUTransporter # qmicli  -d /dev/cdc-wdm1   --nas-get-serving-system
[/dev/cdc-wdm1] Successfully got serving system:
        Registration state: 'registered'
        CS: 'attached'
        PS: 'attached'
        Selected network: '3gpp'
        Radio interfaces: '1'
                [0]: 'umts'
        Roaming status: 'off'
        Data service capabilities: '3'
                [0]: 'hsdpa'
                [1]: 'hsupa'
                [2]: 'wcdma'
        Current PLMN:
                MCC: '310'
                MNC: '260'
                Description: ''
        Roaming indicators: '1'
                [0]: 'off' (umts)
        3GPP daylight saving time adjustment: '1' hours
        3GPP location area code: '40495'
        3GPP cell ID: '39627181'
        Detailed status:
                Status: 'available'
                Capability: 'cs-ps'
                HDR Status: 'power-save'
                HDR Hybrid: 'yes'
                Forbidden: 'no'
        Call barring status:
                Circuit switched: 'all-calls'
                Packet switched: 'all-calls'
        UMTS primary scrambling code: '142'
        Full operator code info:
                MCC: '310'
                MNC: '260'
                MNC with PCS digit: 'yes'


tvupack TVUTransporter # qmicli  -d /dev/cdc-wdm1   --nas-get-signal-info
[/dev/cdc-wdm1] Successfully got signal info
HDR:
        RSSI: '-125 dBm'
        ECIO: '-2.5 dBm'
        SINR (8): '9.0 dB'
        IO: '-106 dBm'
WCDMA:
        RSSI: '-96 dBm'
        ECIO: '-6.5 dBm'


>However, when you're "locked" to WCDMA, what happens if you run
>--nas-network-scan?  Does the modem soon jump back to LTE now that it

>has a full network list?


when locked to WCDMA, then run --nas-network-scan:
tvupack TVUTransporter # qmicli  -d /dev/cdc-wdm1     --nas-network-scan
[/dev/cdc-wdm1] Successfully scanned networks


NO available information output, also not jump back to LTE


Is there someone encounter this issue?

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