OBSAI
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| Abbreviation | OBSAI |
|---|---|
| Formation | 2002 |
| Type | Trade group |
| Purpose | Interface standards |
| Website | www |
The Open Base Station Architecture Initiative (OBSAI) was a trade association created by Hyundai, LG Electronics, Nokia, Samsung and ZTE in September 2002 with the aim of creating an open market for cellular network base stations. The hope was that an open market would reduce the development effort and costs traditionally associated with creating base station products.
The OBSAI specifications provided the architecture, function descriptions and minimum requirements for integration of a set of common modules into a base transceiver station (BTS). It:
This was intended to provide the BTS integrator with flexibility. A version 2.0 system reference document was published in 2006.
The OBSAI Reference Architecture defines four functional blocks, interfaces between them, and requirements for external interfaces.
A base transceiver station (BTS) has four main blocks or logical entities: Radio Frequency (RF) block, Baseband block, Control and Clock block, and Transport block.
The Radio Frequency Block sends and receives signals to/from portable devices (via the air interface) and converts between digital data and antenna signal. Some of the main functions are D/A and A/D conversion, up/down conversion, carrier selection, linear power amplification, diversity transmit and receive, RF combining and RF filtering.
The Baseband Block processes the baseband signal. The functions include encoding/decoding, ciphering/deciphering, frequency hopping (GSM), spreading and Rake receiver (WCDMA), MAC (WiMAX), protocol frame processing, MIMO etc.
The Transport Block interfaces to external network, and provides functions such as QoS, security functions and synchronization.
Coordination between these three blocks is maintained by the Control and Clock Block.
Internal interfaces between the functional blocks are called reference points (RP).
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