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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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