Wireless communications is a type of data communication that is performed and delivered wirelessly. This is a broad term that incorporates all procedures and forms of connecting and communicating between two or more devices using a wireless signal through wireless communication technologies and devices.
The Global System for Mobile Communications (GSM) is a second generation (2G) standard for mobile networks.
In the early 1980s, a group was formed by the European Telecommunications Standards Institute (ETSI) to develop a digital mobile communication system. Aptly named Groupe Speciale Mobile (GSM), its main task was to develop a single, consistent network for all of Europe and come up with a better and more efficient technical solution for wireless communication.
CDMA (Code-Division Multiple Access) refers to a protocol used in second-generation (2G) and third-generation (3G) wireless communications. Code Division Multiple Access (CDMA) is a sort of multiplexing that facilitates various signals to occupy a single transmission channel. It optimizes the use of available bandwidth. The technology is commonly used in ultra-high-frequency (UHF) cellular telephone systems, bands ranging between the 800-MHz and 1.9-GHz.
General Packet Radio Service (GPRS) is a packet-switching communications protocol for cellular networks. Mobile phones that have the GPRS technology can be used to receive data and information, such as web pages and email. GPRS is an "always on" technology which means that the mobile phone is always ready to receive data.
• Short Message Service (SMS) – It is a special-purpose communication protocols designed for text messaging
• Multimedia Messaging Service (MMS) – It is an extensions to SMS to enable transmission of videos in addition to text
• Wireless Application Protocol (WAP)– It is a specialized communication protocol for mobile browsers.
WLL is a system that connects subscribers to the local telephone station wirelessly. Wireless local loop is used for wireless communication links which deliver plain old telephone services or broadband services to customers. This is an ideal application which provides telephone services remotely and is mostly used in developing countries where cable infrastructure is either expensive or speed is not fast. This wireless link can be a part of the connection between the subscribers and switch.
This system is based on radio networks which provide services like telephone in remote areas. Different types of wireless local loop include Broadband Wireless Access, Radio in the Loop, Fixed Radio Access and Fixed Wireless Access.