7 Network service related commands

7.2 Network registration +CREG

AT+CREG=[<n>]
设置网络注册状态返回的模式。
AT+CREG?
+CREG: <n>,<stat>[,[<lac>],[<ci>],[<AcT>][,<cause_type>,<reject_cause>]]
<stat>: integer type; circuit mode registration status.
1 registered, home network
5 registered, roaming

7.3 PLMN selection +COPS

AT+COPS=[<mode>[,<format>[,<oper>[,<AcT>]]]]
<mode>: integer type
0 automatic (<oper> field is ignored)
1 manual (<oper> field shall be present, and <AcT> optionally)
2 deregister from network
<format>: integer type
0 long format alphanumeric <oper>
1 short format alphanumeric <oper>
2 numeric <oper>
<oper>: string type; <format> indicates if the format is alphanumeric or numeric
<AcT>: integer type; access technology selected
0 GSM
2 UTRAN
7 E-UTRAN

8 Mobile termination control and status commands

8.69 Extended signal quality +CESQ

制式	rxlev	ber	rscp	ecno	rsrq	rsrp	ss_rsrq	ss_rsrp	ss_sinr	备注
GERAN	rxlev	ber	255	255	255	255	255	255	255	一般仅用rxlev, 和rssi有映射关系
UTRA FDD	99	99	rscp	ecno	255	255	255	255	255	一般仅用rscp
UTRA TDD	99	99	rscp	255	255	255	255	255	255	仅用rscp
E-UTRA	99	99	255	255	rsrq	rsrp	255	255	255	一般仅用rsrp
NR	99	99	255	255	255	255	ss_rsrq	ss_rsrp	ss_sinr	一般仅用ss_rsrp

10 Commands for packet domain

10.1.1 Define PDP context +CGDCONT

关于PDP type，这里简单列出常用的3个：
<PDP_type>: string type; specifies the type of packet data protocol. The default value is manufacturer specific.
IP Internet Protocol (IETF STD 5 [103])
IPV6 Internet Protocol, version 6 (see RFC 2460 [106])
IPV4V6 Virtual <PDP_type> introduced to handle dual IP stack UE capability. (See 3GPP TS 24.301 [83])

10.1.20 GPRS network registration status +CGREG

<stat>: integer type; indicates the GPRS registration status.
1 registered, home network
5 registered, roaming
在Attach Complete后上报。

10.1.22 EPS network registration status +CEREG

1 registered, home network
5 registered, roaming

10.1.47 5GS network registration status +C5GREG

1 registered, home network
5 registered, roaming