It was after this that modern CDMA was born. It owes its appearance to the American engineer Irwin Marc Jacobs, who in 1985 founded the QUALCOMM company. In 1991, this company conducted the first tests of new generation networks, and in 1992 the CDMA standard was officially recognized. - It was after this that modern CDMA was born. It owes its appearance to the American engineer Irwin Marc Jacobs, who in 1985 founded the QUALCOMM company. In 1991, this company conducted the first tests of new generation networks, and in 1992 the CDMA standard was officially recognized.
CDMA Development Group (CDG) - CDMA Development Group (CDG), founded in December 1993, is an international consortium of companies. He works together to lead the growth and development of modern wireless telecommunications systems.The CDG is made up of service providers, infrastructure manufacturers, device vendors, test hardware vendors, application developers, and content providers. Its members jointly define the technical requirements for the development of additional CDMA2000 and 4G systems. In addition, interoperability with other emerging wireless technologies is intended to increase the availability of wireless products and services to consumers and businesses around the world.
IMT-2000 system
picture 4
Return channel - The reverse channel is the direction of communication between mobile devices or an uplink path. It consists of the following channels
- Access Channel - The access channel is used by mobile stations to establish communication with a base station or to respond to paging channel messages. The access channel is used to exchange short signaling messages such as calls, page responses, and registrations.
- Reverse Traffic Channel - The Reverse Traffic Channel is used by individual users in their actual calls to carry traffic from one mobile station to one or more base stations.
Return channel
picture 5
Channels
Do'stlaringiz bilan baham: |
