GSM/GPRS Module Learning

Directory

Version record ... 2

Directory... 3

1 Overview ... 4

2 acronyms with related concepts ... 4

3 Gsm/gprs. 6

4 SIM Card Interface ... 7

5 at instruction ... 7

6 Call with Inbound ... 7

7 SMS (SMS) and PDU format ... 7

8 STK. 7

9 GPRS connection ... 8

9.1 Examples ... 8

9.1.1 Environment ... 8

9.1.2 Bluetooth is connected to the GSM module, and the AT command is unblocked ... 8

9.1.3 uses the PPP protocol to connect GPRS. 9

9.1.4 use socket for network communication ... 12

9.2 GPRS access point ... 12

9.2.1 3 access points on the phone ... 12

The difference between 9.2.2 Cmwap and Cmnet is: ... 12

10 Appendix ... 13

11 Contact Method ... 13

1 Overview

This paper mainly records some experience in learning Gsm/gprs module.

Mainly includes GSM/GPRS module, at instruction, SIM card interface, mobile phone short message PDU format and GPRS Internet connection. 2 acronyms and related concepts

² BSS: Base station subsystem (wireless) base station subsystem

² EVB: Evaluable Board Evaluation Board

² HLR: HLR is the central database of the GSM system, which stores the relevant data of all existing mobile users controlled by the HLR. All important static and dynamic data for mobile users are stored in HLR, which includes data such as mobile user identification numbers, access capabilities, user categories, and supplemental services, as well as information about Dynamic Data for MSc in the MSC region where mobile users actually roam. In this way, any incoming call can be immediately sent to the named user by the selection path.

² iccid: Also known as the SIM card number, a unique identification number for the SIM card, a total of 20 digits, used to identify the uniqueness of each SIM card.