Introduction to Mcrnc

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mcRNC Architecture and Functionality

Introduction to mcRNC





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Table of Contents:

1 Introduction ........................................................................................................ 4

2 Scaling According to Capacity Needs ................................................................ 5

3 Role of RNC within 3G Network ......................................................................... 6

4 RNC Interfaces ................................................................................................ 11

5 Exercise .......................................................................................................... 12





1 Introduction

The huge growth of traffic over recent years has brought new challenges to thedesign of radio network equipment. To satisfy current and future needs, NokiaSiemens Networks has developed a novel, compact and highly scalable multi-purpose technology platform for various network element applications. The purposeof this course is to describe one such multicontroller network element, namely themulticontroller radio network controller (mcRNC). Other multicontroller networkelements, such as the multicontroller base station controller (mcBSC) andmulticontroller transcoder (mcTC) are not covered by this course.

The ultra-high packing density of the multicontroller hardware results in variousbenefits, such as:

unrivaled footprint

minimized site costs

minimized overall operational expenditure (OPEX).

In addition to the high scalability, high reliability and high performance, themulticontroller design offers high flexibility, that is, the controller role can be changedby loading different software. In this way, for instance, a multicontroller BSC (or partsof the BSC) can be converted into a multicontroller RNC - ensuring a future-proof

evolution path for existing radio network equipment.





2 Scaling According to Capacity Needs

The multicontroller RNC provides highly scalable connectivity for voice and dataapplications.

Because of the small size and easy installation the mcRNC can be located in aremote location near one or more base stations, at a separate RNC site, or at a corenetwork site.

The network element consists of between two and eight hardware modules,measuring only 444 mm x 450 mm x 176 mm each. The hardware modules can beinstalled as such or in any standard 19” ETSI rack. This makes it possible to optimizeRNC configurations for different areas and use cases.





3 Role of RNC within 3G Network

Let us next examine the role of the radio network controller within a third generation(3G) mobile network.

The radio network controller controls a number of base stations - also called basetransceiver stations (BTSs).

The radio access network (RAN) is connected to the circuit-switched core networkvia the Media Gateway (MGW). In the user plane, the circuit-switched user data (forinstance, speech) is carried between the RNC and the MGW, which performsswitching, transcoding and various other media processing tasks. In the controlplane, the call control signaling messages are carried between the RNC and MSCServer (MSS).

The RNC is connected to the packet-switched core network via the Serving GPRSSupport Node (SGSN).

Move your mouse pointer over the network elements in the figure to find out moredetails.





















4 RNC Interfaces

Multicontroller RNC network elements connect to the outside world principally viafour types of interfaces:

Iub interface between the RNC and base transceiver stations

Iur interface between the RNC and another RNC, to be used during inter-RNC handovers

Iu-CS interface between the RNC and the MGW in the user plane, or betweenthe RNC and MSC Server in the control plane

Iu-PS interface between the RNC and Serving GPRS Support Node (SGSN)

There are some additional interfaces that are not shown in the figure, such as theO&M interface towards NetAct, the Iupc interface towards the Standalone AssistedGlobal Positioning System Serving Mobile Location Center (SAS), and the Iu-BCinterface towards the Cell Broadcast Center (CBC).

All interfaces are based on IP over Ethernet transmission.





5 Exercise

Documents

Introduction to Mcrnc