Orion RAN Slicing for a Flexible and CostEffective Multi-service Mobile Network Architecture Xenofon Foukas, Mahesh K. Karina, Kimon Kontovasilis Introduction Whats important for a 5G Network? 5G Network Characteristics 1. Service Oriented 2. Flexibility
1. Slice Controllers as separate processes - Allows use of existing virtualization tech 1. Single Hypervisor - Isolation from resources perspective 1. Allocation algorithm - Accounts for slice SLA and physical constraints 1. UEs unaware of slices - Slices appear as different MVNOs Orion Design
Base Station Hypervisor Virtual Control Plane End-to-End Network Slicing Base Station Hypervisor Intermediary for Communication: 1. Hypervisor to Slice - API to access/modify data plane state - Allocates virtualized
resources 1. Slice to Hypervisor - Uses virtual resources for control plane operations - Sends commands to Hypervisor 4 Components: 1. 2.
3. 4. Slice Context Manager Radio Resource Manager Virtualization Manager UE Association Manager Base Station Hypervisor Architecture
Slice Context Manager Role: Tracks and updates information on slices. Slice Context Manager Slice Service Description 1. Service Level Agreement (SLA) - Service requirements - Unrestricted by Orion 1. List of UE identifiers - Used for mapping UEs to
slices Admission Control - Checks active slices information Consults Infrastructure Providers admission policy to accept/reject
Radio Resource Manager Role: Allocates physical radio resources among slices. Resource Allocation Period: occurs every allocation window (duration t) 1. Decides how to allocate resources for next window - Uses Slice Context Managers context info 1. Generates 2D array for partionable
resources 2. Forwards decision to Slice Context Manager Radio Resource Manager Upon Receiving Scheduling Decision: 1. Translates & updates data plane state - Uses custom API 1. Tracks slices physical resources - To inform future allocation
Virtualization Manager Role: Maintains isolation of slices from physical resources. Two Main Tasks 1. Present resource abstraction to slices 2. Present virtualized data plane state to slices Virtualization Manager
Radio Resource Abstraction - Uses Radio Resource Managers Resource Map Maps decisions from virtual to physical Omits: -
Info irrelevant to slice Resource grid and Frequency Dimension information Allows Slice Control Plane full access to their own resources. Virtualization Manager Radio Resource Abstraction Challenges:
- How to hide physical grid layout from slices? How to follow physical constraints? - eg. Group Based Allocation, Frequency dependencies
Block) - Capacity: amount of data in one or more PRBs - Allows varying capacities
Virtualization Manager vRRB Pools: groups of vRRBS - Different pools for uplink/downlink 0 or more pools per slice Slices can only allocate resources in their pools Handles frequency dependency challenge Virtualization Manager
Data Plane Abstraction - Reveals relevant data plane state to slices - - Isolation: information reported in vRRBs
Provides cell-related configuration to slices - Provided to all slices Relevant Information? UE information is only
reported to their slice. UE Association Manager Role: Assigns UEs to slices. Two Steps: 1. Aiding Discovery 2. Attachment/Mapping UE Association Manager
(Step 1) Aiding Discovery of UE 1. Gets active slices from Slice Context Manager 2. Broadcast information through Base Station 3. UE enters attachment process after successful random access process Broadcast and Random Access processes of Base Stations kept internal to Hypervisor. UE Association Manager (Step 2) Mapping UE to a Slice
1. UE supplies a unique ID 2. Manager maps UE to slice with a UE lookup function - Slice Context Manager maintains lookup functions for each slice 1. Updates list of active UEs in slices context 2. Notifies slices virtual control plane Virtual Manager takes control of UE. Virtual Control Plane Separation
- Separate processes - - Uses existing virtualization tech Dedicated channel with
Hypervisor Association with multiple physical Base Stations - Flexibility Control plane centralization in different regions
Virtual Control Plane End-to-End Network Slicing Evaluation Scalability vs. State of the Art Impact of Communication Channel Scalability
Vs. State-of-the-Art Vs. State-of-the-Art Impact of Communication Channel Case Studies Isolation Capabilities Flexible Radio Resource Allocation Deployment in End-to-end setting
Isolation Capabilities Flexible Radio Resource Allocation Deployment in End-to-End Setting Conclusion Orion achieves both: - Functional Isolation
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