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orthogonal sub channel (GSM) (OSC)

There are various modulation methods and codings for more efficient use of transmission channels. In the Global System for Mobile Communications( GSM), there are various methods for increasing the transmission rate, such as High Speed Circuit Switched Data( HSCSD), General Packet Radio Service( GPRS) and Enhanced Data Service for GSM Evolution( EDGE).

Orthogonal Sub Channel( OSC) is a method for doubling the channel capacity of a GSM base station that does not require any hardware changes but is implemented by software.

The OSC method was developed by Nokia Siemens Networks. According to the concept, Orthogonal Sub Channel (OSC) implements a subchannel that can be used simultaneously with the existing channel. This means that 2x2 calls are possible in this constellation. If the existing channel is occupied, an additional call can be transmitted between two cell phones via this subchannel. The technical implementation takes place via the separate downlinks and uplinks. The signals in the downlink are keyed with quadrature phase shift keying( QPSK), while transmission in the uplink is orthogonal in separate subchannels. This transmission is known as Multiple Input Multiple Output( MIMO) and is used in many other radio technologies.

Informations:
Englisch: orthogonal sub channel (GSM) - OSC
Updated at: 11.10.2013
#Words: 190
Links: modulation, transmission, indium (In), global system for mobile communications (GSM), transmission rate
Translations: DE
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