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分类: LINUX

2008-02-25 14:46:27

The Radio Network Controller (RNC) is a key network element in third-generation (3G) wireless networks. It is part of the access network and is responsible for mobility management, call processing, link management and handover mechanisms.

In accomplishing these functions, the RNC must perform a complex, demanding set of protocol processing tasks at wire speed with high reliability and predictable performance.

As an important part of the 3G network, the RNC is a focal point for traffic aggregation, conversion, soft and hard call handoffs and intelligent cell and packet processing.

The RNC performs traditional wireless voice communications functions such as:

  • Node B concentration
  • Link connection with Node B and core network
  • Termination of control signal from Node B and core network
  • Termination of Layer 2 radio interface
  • Call connection control with mobile station
  • Diversity hand-over control
  • Traffic data collection/statistics
  • Resource management of radio network

In addition, the RNC provides bridging functions for connecting to IP packet-switched networks. Not only does the RNC support traditional ATM AAL2 (voice) and AAL5 (data) functions, but also IP over ATM (IPoA) and Packet over SONET (POS). In addition, the high growth of wireless users has put greater demands on IP technology, which means future platforms have to support both IPv4 and IPv6. Next-generation network processors are a perfect fit for this rich multi-protocol environment.

RNC Stack Diagram

Interfaces

  • Development / integration of Control Plane / User Plane RNC-CN interface (Iu) protocol stack - RNC RANAP protocol stack
    - Iu User Plane protocol
    - GTP-U
    - Transport network protocols
  • Control Plane RNC-RNC interface (Iur) protocol stack (RNSAP )
  • Control Plane RNC-Node B interface (Iub) protocol stack (NBAP)
  • Radio Interface Protocols RRC, RLC, PDCP as per 3GPP standards

software from Continuous Computing provides the above protocols in a portable architecture.

Critical Features

Price/Performance

  • The market for 3G services will be highly competitive and operators need systems which allow them to serve large numbers of subscribers profitably and cost effectively.

Programmability

  • Programmability eases the task of changing features and functionality in an RNC, shortens time-to-market and increases the longevity of the equipment.

Modularity and Scalability

  • When designed properly, such systems can effectively add more computing, protocol processing or I/O functions independently without requiring an entire system upgrade or replacement.

High Availability

  • RNCs must be designed with carrier-grade reliability. Systems must meet or exceed the industry benchmark of "five-nines" availability. Continuous Computing's DFT / HA helps achieve this.
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