Building a robust packet control unit with network processors

GPRS (general packet service) is a 2.5G technology based on GSM networks which can offer more capacity and flexibility for the user. As the core part of GPRS, PCU (packet control unit) is responsible for handling packet-related resource and process packets encapsulation/decapsulation between RLC/LLC and BSSGP protocols. Due to the complexity of its function, all the PCU used today are made of common chips. It is very difficult to meet the incrementing speed of incoming packets while still performing signaling management at the same time. Using IXP2800 processor can solve this problem easily. This article introduces a mode of PCU using Intel IXP2800 chips. Illustrated its functional blocks and how it works.