A multi-carrier, multi-sector GSM Basestation (BTS) consists of a multi-carrier radio sub-system communicating with a DSP sub-system that implements the GSM-GPRS-EDGE modems for each carrier. These carriers are then aggregated by a control processor according to the Abis interface between the BTS and the BTS controller (BSC).
Low OPEX and low CAPEX networks are deployed to extend the reach of PLMN to less populated and/or low economy areas. They require GSM BTS that are small, easy to install, easy to maintain, low cost and low power.
Such constraints can be met with a single SoC which provides high performance DSP processing for up to 21 carriers, an embedded CPU for Abis protocols and Operations and Maintenance (OAM), and all interfaces required for a very low system BOM.
GSM and EGPRS modems are implemented in software and are easy to upgrade to GERAN evolutions such as EGPRS2.
Each EGPRS carrier consumes 70mW of DSP power and a complete multi-carrier baseband system for 24 GSM-EGPRS carriers consumes 2.5 Watts including embedded CPU and IO’s.
The Radio sub-system is connected to the OCT2224W through 3 parallel interfaces compliant with JESD207 or through a high-speed SRIO serial interface. The Backhaul interface can use the TDM port or one of the 4 SGMII ports.
Octasic offers GSM-GPRS-EGPRS modem source code library that are compliant with 3GPP TS 51 021 and optimized for the OCT2224W Opus2 DSP core. This library can be used to build a complete BTS or can be combined with the System Integrator’s proprietary algorithms.
Octasic offers a complete set of development tools for the OCT2200 series of devices. Opus Studio, an integrated development environment (IDE), provides the necessary tools for code editing, compiling, simulation, debugging, and profiling. Octasic also provides a real-time kernel and RTOS services upon which embedded applications can rapidly be developed.