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OpenRAN : A New Architecture for Mobile Wireless InternetRadio Access Networks

Published in :-IEEE Communication Magazine

Presented by :CHANDAN KUMAR MISHRARoll no.- 31CS-A, SOEGuided by- Mrs Ancy Zachariah

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Contents Introduction

The Next Generation Wireless Dream

Requirements Of Future Radio Access Networks

Present Scenario

Looking anew into the Access Network

Third-Generation(3G) RAN Architectures

OpenRAN Requirements

OpenRAN Architecture

Future Work

Summary

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Introduction

RAN : Radio Access Network - an extensive wired network between the core network and

the radio transceivers that handle particular cells

- provides functions that coordinate access to the radio link

between multiple radio base stations and between mobile terminals

OpenRAN- proposed by James Kempf, Parviz Yegani - a new architecture for mobile wireless RANs

- based on a distributed processing model with a routed IP network

as the underlying transport fabric

- the architecture consists of a collection of 77 atomic functions

grouped into 16 functional entities with 32 interfaces between them

• Seamless co-existence of heterogeneous wireless technologies

• Current and Emerging Wireless Technologis IMT-2000/3GPP,MBS, BWA

• Broadband Data-centric Services – multimedia documents, high quality video conferencing, mobile gaming

The Next Generation Wireless

Dream

• “Network Utopia” – The anytime, anywhere, any-thing networking paradigm

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• Increased data-rates and backhaul traffic

• Scalability, Flexibility and Reconfigurability

• Spectrum

• Low Cost Of deployment and

Operation

Requirements Of Future Radio

Access Networks

• The current network infrastructure is untenable for high-capacity, high-data rate micro-cellular services

• The Network is primarily designed to support circuit-

switched traffic

• Current Backhaul use TDM based T1/E1 links which incur huge costs

Access Network Perspec-tive

Present Scenario

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The Transi-tion…..

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3G RAN Architectures

Star topology & Centralized architecture - a centralized RNC is connected by point-to-point link with the BTSs

RNC(Radio Network Controller) - allow mobile nodes to roam between geographical areas controlled by different RNCs without requiring the participation of the core network in a handoff - connected to circuit-switched core network for voice call and circuit-switched data - connected to packet-switched access gateway for direct access to the Internet

BTS(Base Transceiver Station) - handle radio network connectivity for a particular region or cell

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(RNC) (RNC)

3G RAN Architectures

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3G RAN Architectures

Potential problems

- the RNC is a single point of failure

- incrementally upgrading RAN capacity to handle more mobile

terminals is sometimes not possible

- Each radio link protocol has its own radio network layer protocol

implemented by the RNC to control the radio link

• “ The vision of the OpenRAN Architecture is to design a radio access network with the following characteristics

Open

Flexible

Distributed

Scalable ”

Looking Anew : OpenRAN Architecture –

An all-IP Paradigm

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OpenRAN Requirements

• Architectural requirements

-Compatible with existing multiple radio technologies.

-Having separate and distributed control and bearer path

on the core network side of the RAN

- Must support IP as the base layer for both control and

bearer transport

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OpenRAN Requirements

- Support Operation, Administration, and Network Management

based on open interfaces and Internet Engineering Task Force(IETF)

network management protocols

- QoS issues must support multiple QoS levels QoS on the wire in the RAN and over the air must be integrated

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OpenRAN Requirements

Operator and Service requirements

- Having open interfaces between network entities,

with IETF protocols wherever possible

- Interoperability with 2G/3G core networks,

and with 2G/3G access networks

- Easy installation and configuration

by allowing components to auto-configure wherever possible

- Allow handoff between different radio link protocols

on a single RAN

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OpenRAN Architecture

Partitioning a RAN into atomic functions

Grouping the atomic functions into functional entities

based on the requirements

Identify Interfaces between the functional entities

Possible protocol development

- characterize the nature of the traffic over those on those interfaces

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OpenRAN Architecture

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Functional Entities The functional entities are divided into two parts:

1. Control plane functional entities

2. Bearer plane functional entities

Radio layer 1 and O A&M kept as separate function

Control plane functional entities: Control the radio link pro-

tocol between the mobile terminals and the BTSs

Bearer plane functional entities: involved in adapting ap-

plication IP traffic to the radio in both the uplink and downlink

directions

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Radio Layer 1

Functions involved in controlling radio layer 1 were collected in it.

Initial detection and establishment of contact with

a mobile terminal

System information broadcast

Power control

- uplink outer loop power measurement

- downlink outer loop power control

- uplink inner loop power control

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Operations, Administration,and Management

Identified functions

- static configuration and allocation of common radio resources

- configuration of system information broadcast

- management of IP address assignment in the RAN

- radio network operations and maintenance

- database management

- tracing control

Interoperable RAN management using IP protocols

such as SNMP was identified as an important part

of the OpenRAN architecture

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Access Gateway

Not part of the OpenRAN

Handles traffic between the OpenRAN and

an IP core network

Handles admission control and QoS

Performs authorization and authentication to admit

IP packet flows between the core and RAN

maps QoS classifications on incoming and outgoing

application packets between the RAN and the core

Multistandard RANCommon O&MCommon Network Ele-

mentsRadio Resource Man-

agementinformation collectionmultistandard RRM al-

gorithmsaccess network selec-

tion

IP Core Network

UMTSOpenRAN

GSMOpenRAN

HiperlanOpenRAN

MultistandardRRM

duringhandover /connection

set up

• location• velocity• QoS requirements• radio interfaces

• load• services• price• coverage

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Future Work

Mechanisms for pushing mobility management

QoS & Security

A common radio network layer protocol for multiple

radio link protocols

Standardization & Interoperability

Network management

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Summary

The OpenRAN architecture is a first step toward an all-IP radio access network

The OpenRAN architecture - describes how to decompose radio access network functionality

in a way that allows a distributed implementation

- opens the door to implementing functions common among multiple

radio link protocols

There is still much work to be done - how to implement common functions

- a common radio network layer protocol

- interoperable network management.

REFERENCES IEEE COMMUNICATION MAGAZINE

OpenRAN by James Kempf, DoCoMo Commu-nications Laboratories, USA Parviz Yegani, Cisco Systems.

Mobile Wireless Internet Forum www.3gpp.org http://en.wikipedia.org/wiki/

Radio_access_network

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