Results of the Demonstration of Shared Spectrum Access of Different - - PowerPoint PPT Presentation

Results of the Demonstration of Shared Spectrum Access of Different User Groups and Changing Priorities

Authors

Topi Tuukkanen, (Finnish Defence Research Agency) Heikki Kokkinen (Fairspectrum, Finland) , Seppo Yrjölä (Nokia, Finland), Jaakko Ojaniemi (Fairspectrum, Finland), Arto Kivinen (Fairspectrum, Finland), Jarkko Paavola (Turku University of Applied Sciencies)

Introduction

Army Digital Battlefield

• Armed forces’ requirements for

spectrum access vary over time and location

• Rigid and fixed spectrum

management schemes do not provide military any incentive to relinquish exclusive access to spectrum

Model of changing priorities

Request, Notification and Reservation Procedures

LR LC Processing of Request Request Response LR LC Processing of Notification Notification Response LR LC Processing of Reservation Reservation Response

LSA with multiple Repositories and Controllers

Spectrum Manager LR1 LC1 Public safety NRA LR3 LC3 LC2 LR2

Military

MNO

Protocol stack for changing priorities

• In Notification protocols, an

intermediate connectivity layer is needed, just like in email app in the mobile phone

• Websocket used in this study

IEEE 802.X IP TCP TLS WebSocket HTTPS JSON LSA-1 IEEE 802.X IP TCP TLS WebSocket HTTPS JSON LSA-1 LR LS

Priority changes between three priority order states

Primary Secondary Tertiary Commercial Public safety Military Peace Primary Secondary Tertiary Military Commercial Public safety Hybrid war Primary Secondary Tertiary Public safety Commercial Military Disaster

Experimental system setup

Demonstration system

Military Video Public safety LTE Spectrum manager Commercial LTE Request procedure Notification procedure Reservation procedure NRA

Spectrum Manager architecture

• Perimeter security model
• Amazon EC2 VPC
• C++, Python, PHP

LR1 LC1 LR3 LC3 LC2 LR2 UI DB Processing

NRA User Interface

User interface for reservations

Simplified LTE network

• Off-the-shelf 2.3 GHz devices
• UEs
• eNodeBs
• EPC
• Management plane of eNB

MME S-GW

PDN-GW

eNB UE

S1-U S5/S8 S11 S1-MME

User plane Control plane EPC Spectrum manager Management plane

eNodeBs as part of demonstration network

Spectrum analyzer image of military transmitter (right) and LTE (left)

Spectrum allocation algorithm

Begin

Initalize channels to 2 COM priority channel 1

COM arrival Channel 1 free

Lower priority assigned

Any channel free False True False End False True Evacuate lowest priority

Lower priority assigned?

Assign to channel 1 Any channel free False Put request in queue

Refarm from channel 1 to free channel

Put request in queue True False Evacuate lowest priority Assign to free channel True True True False

Experimental validation of procedures with changing priorities

Validation workflow

Requirements from stakeholders

Literature and standards Construct model Implement model

Test cases and evacuation times

Check model Update model Model is Invalid Model is Valid

Denial of entry when no capacity

COM COM PS

COM

PS MIL COM Arrivals PS Spectrum MIL Priority COM PS MIL

Initial allocation with alternative priority

• rder

t COM COM PS COM PS MIL PS Arrivals Spectrum COM PS MIL Priority MIL PS COM

Priority change under high spectrum demand

MIL PS MIL PS COM MIL PS COM MIL t Priority Spectrum Arrivals

Evacuation times with Request, Notification, and Reservation procedures.

Conclusions

Dynamic spectrum access system for changing priorities

• Controlled by NRA UI
• Experimental validation
• Evacuation time for

Request, Notification, and Reservation procedures

Summary

Future work

• Evacuation time measurements

using with incumbent sensors

• Licensee activity sensors at the

location of the higher priority user

• Extension of the changing priority

spectrum sharing model with a better propagation model

• Larger number of devices, and with

different controls, including power level, center frequency change, and bandwidth change

Future work