Transcript OpenRAN Architecture

OpenRAN : A New Architecture for
Mobile Wireless Internet
Radio Access Networks
Published in :-IEEE Communication Magazine
Presented by :
CHANDAN KUMAR MISHRA
Roll no.- 31
CS-A, SOE
Guided 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
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The Next Generation Wireless
Dream
• “Network Utopia” – The anytime, anywhere, anyt
hing networking paradigm
• Current and Emerging Wireless Technologis IMT2000/3GPP,MBS, BWA
• Broadband Data-centric Services – multimedia doc
uments, high quality video conferencing, mobile gami
ng
• Seamless co-existence of heterogeneous wireless t
echnologies
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Requirements Of Future Radio
Access Networks
• Increased data-rates and backhaul traffic
• Spectrum
• Scalability, Flexibility and Reconfigurability
• Low Cost Of deployment and
Operation
Present Scenario
Access Network Perspective
• The Network is primarily designed to support circuitswitched traffic
• The current network infrastructure is untenable for highcapacity, high-data rate micro-cellular services
•
Current Backhaul use TDM based T1/E1 links which
incur huge costs
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The Transition….
.
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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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3G RAN Architectures
(RNC)
(RNC)
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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
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Looking Anew : OpenRAN Architecture –
An all-IP Paradigm
• “ The vision of the OpenRAN Architecture is to design
a radio access network with the following characteristics
 Open
 Flexible
 Distributed
 Scalable ”
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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
protocol between the mobile terminals and the BTSs
Bearer plane functional entities: involved in adapting
application 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
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Multistandard RAN
 Common O&M
 Common Network
Elements
 Radio Resource
Management
 information collection
 multistandard RRM
algorithms
 access network
selection
IP Core Network
during
handover /
connection
set up
Multistandard
RRM
UMTS
OpenRAN
GSM
OpenRAN
Hiperlan
OpenRAN
•load
•services
•price
•coverage
•location
•velocity
•QoS requirements
•radio interfaces
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.
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REFERENCES
 IEEE COMMUNICATION MAGAZINE OpenRAN by
James Kempf, DoCoMo Communications
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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