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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