Published in :-IEEE Communication Magazine 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

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

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

The Next Generation Wireless Dream “Network Utopia” – The anytime, anywhere, anything networking paradigm Current and Emerging Wireless Technologis IMT-2000/3GPP,MBS, BWA Broadband Data-centric Services – multimedia documents, high quality video conferencing, mobile gaming Seamless co-existence of heterogeneous wireless technologies 4/26

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 circuit- switched traffic The current network infrastructure is untenable for high-capacity, high-data rate micro-cellular services Current Backhaul use TDM based T1/E1 links which incur huge costs 6/26

The Transition….. 7/26

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

3G RAN Architectures (RNC) (RNC)

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

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 ” 8/26

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

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

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

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

OpenRAN Architecture

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

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

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

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 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

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 Communications Laboratories, USA Parviz Yegani, Cisco Systems. Mobile Wireless Internet Forum www.3gpp.org http://en.wikipedia.org/wiki/Radio_access_network

Thank You Obrigado Gracias Grazie Merci Danke Self explanatory Korean Hebrew Italian Gracias Spanish Russian Obrigado Thank You Portuguese Arabic Merci English French Danke Traditional Chinese German Self explanatory Thai Simplified Chinese Korean Tamil Japanese

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