OpenRAN : A New Architecture for Mobile Wireless Internet Radio Access Networks

1. OpenRAN : A New Architecture for Mobile Wireless InternetRadio Access Networks Published in :-IEEE Communication Magazine Presented by : CHANDAN KUMAR MISHRA Roll no.- 31 CS-A, SOE Guided by- MrsAncy Zachariah

2. 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

3. 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, ParvizYegani - 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

4. The Next Generation Wireless Dream • “Network Utopia” – The anytime, anywhere, anything networking paradigm • Current and Emerging Wireless TechnologisIMT-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

5. Requirements Of Future Radio Access Networks • Increased data-rates and backhaul traffic • Spectrum • Scalability, Flexibility and Reconfigurability • Low Cost Of deployment and • Operation

6. 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

7. The Transition….. 7/26

8. 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

9. 3G RAN Architectures (RNC) (RNC)

10. 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

11. 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

12. 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

13. 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

14. 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

15. OpenRAN Architecture • Partitioning a RAN into atomic functions • Grouping the atomic functions into functional entitiesbased on the requirements • Identify Interfaces between the functional entities • Possible protocol development - characterize the nature of the traffic over those on those interfaces

16. OpenRAN Architecture

17. 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

18. 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

19. 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

20. 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

21. IP Core Network Multistandard RAN • Common O&M • Common Network Elements • Radio Resource Management • information collection • multistandard RRM algorithms • access network selection duringhandover / connection set up Multistandard RRM UMTS OpenRAN GSM OpenRAN Hiperlan OpenRAN • load • services • price • coverage • location • velocity • QoS requirements • radio interfaces

22. Future Work • Mechanisms for pushing mobility management • QoS & Security • A common radio network layer protocol for multiple radio link protocols • Standardization & Interoperability • Network management

23. 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.

24. REFERENCES • IEEE COMMUNICATION MAGAZINEOpenRAN by James Kempf, DoCoMo Communications Laboratories, USAParvizYegani, Cisco Systems. • Mobile Wireless Internet Forum • www.3gpp.org • http://en.wikipedia.org/wiki/Radio_access_network

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