Open RAN A New Architecture for Mobile Wireless

Open. RAN : 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 1/26

Contents Ø Introduction Ø The Next Generation Wireless Dream Ø Requirements Of Future Radio Access Networks Ø Present Scenario Ø Looking anew into the Access Network Ø Third-Generation(3 G) RAN Architectures Ø Open. RAN Requirements Ø Open. RAN Architecture Ø Future Work Ø Summary 2/26

Introduction Ø 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 Ø Open. RAN- 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 3/26

The Next Generation Wireless Dream • “Network Utopia” – The anytime, anywhere, anything networking paradigm • Current and Emerging Wireless Technologis IMT 2000/3 GPP, 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 circuitswitched traffic • The current network infrastructure is untenable for highcapacity, high-data rate micro-cellular services • Current Backhaul use TDM based T 1/E 1 links which incur huge costs 6/26

The Transition…. . 7/26

3 G RAN Architectures Ø Star topology & Centralized architecture - a centralized RNC is connected by point-to-point link with the BTSs Ø 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 Ø BTS(Base Transceiver Station) - handle radio network connectivity for a particular region or cell 8/26

3 G RAN Architectures (RNC) 9/26

3 G RAN Architectures Ø 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 10/26

Looking Anew : Open. RAN Architecture – An all-IP Paradigm • “ The vision of the Open. RAN Architecture is to design a radio access network with the following characteristics v Open v Flexible v Distributed v Scalable ” 8/26

Open. RAN 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 12/26

Open. RAN Requirements - Support Operation, Administration, and Network Management based on open interfaces and Internet Engineering Task Force(IETF) network management protocols - Qo. S issues ü must support multiple Qo. S levels ü Qo. S on the wire in the RAN and over the air must be integrated 13/26

Open. RAN Requirements Ø Operator and Service requirements - Having open interfaces between network entities, with IETF protocols wherever possible - Interoperability with 2 G/3 G core networks, and with 2 G/3 G 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 14/26

Open. RAN Architecture Ø Partitioning a RAN into atomic functions Ø Grouping the atomic functions into functional entities based on the requirements Ø Identify Interfaces between the functional entities Ø Possible protocol development - characterize the nature of the traffic over those on those interfaces 15/26

Open. RAN Architecture 16/26

Functional Entities Ø The functional entities are divided into two parts: 1. Control plane functional entities 2. Bearer plane functional entities Ø Radio layer 1 and O A&M kept as separate function ØControl plane functional entities: Control the radio link protocol between the mobile terminals and the BTSs ØBearer plane functional entities: involved in adapting application IP traffic to the radio in both the uplink and downlink directions 17/26

Radio Layer 1 ØFunctions involved in controlling radio layer 1 were collected in it. Ø Initial detection and establishment of contact with a mobile terminal ØSystem information broadcast Ø Power control - uplink outer loop power measurement - downlink outer loop power control - uplink inner loop power control 18/26

Operations, Administration, and Management Ø 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 Ø Interoperable RAN management using IP protocols such as SNMP was identified as an important part of the Open. RAN architecture 19/26

Access Gateway Ø Not part of the Open. RAN Ø Handles traffic between the Open. RAN and an IP core network Ø Handles admission control and Qo. S Ø Performs authorization and authentication to admit IP packet flows between the core and RAN Ø maps Qo. S classifications on incoming and outgoing application packets between the RAN and the core 20/26

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 Open. RAN GSM Open. RAN Hiperlan Open. RAN • load • services • price • coverage • location • velocity • Qo. S requirements • radio interfaces

Future Work Ø Mechanisms for pushing mobility management Ø Qo. S & Security Ø A common radio network layer protocol for multiple radio link protocols Ø Standardization & Interoperability Ø Network management 22/26

Summary Ø The Open. RAN architecture is a first step toward an all-IP radio access network Ø The Open. RAN 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 Ø There is still much work to be done - how to implement common functions - a common radio network layer protocol - interoperable network management. 23/26

REFERENCES IEEE COMMUNICATION MAGAZINE Open. RAN by James Kempf, Do. Co. Mo Communications Laboratories, USA Parviz Yegani, Cisco Systems. Mobile Wireless Internet Forum www. 3 gpp. org http: //en. wikipedia. org/wiki/Radio_access_network 24/26

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