network service provisioning in uwb open mobile access networks dario di sorte, student member,...

Network Service Provisioning in UWBOpen Mobile Access Networks

Dario Di Sorte, Student Member, IEEE, Mauro Femminella, Student Member, IEEE,

Gianluca Reali, Associate Member, IEEE, and Sven Zeisberg, Member, IEEE

IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, VOL. 20, NO. 9, DECEMBER 2002Pages 1745-1753

OutlineOutline

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Open Mobile Access Network (OMAN)Open Mobile Access Network (OMAN)

Requirements for PHYRequirements for PHY

UWB as PHYUWB as PHY

UWB Domain ParametersUWB Domain Parameters

Current workCurrent work

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Cofunded by European UnionCofunded by European UnionCurrent paradigmatic chainCurrent paradigmatic chain Infrastructure – Service – Terminal (user)Infrastructure – Service – Terminal (user) Rigid: prevent a quick response to changing user needs Rigid: prevent a quick response to changing user needs

and business models and business models

Open Mobile Access Network (OMAN) paradigmOpen Mobile Access Network (OMAN) paradigm Efficient information transportEfficient information transport Modern, small scale, electronic business, evolutionary Modern, small scale, electronic business, evolutionary

growthgrowth Decouples user, info transport resources, content Decouples user, info transport resources, content

provision service provision service

Goal: ‘standardize’ a new commodity dealing with Goal: ‘standardize’ a new commodity dealing with the transportation of electronic informationthe transportation of electronic information

OMAN ConceptsOMAN Concepts

Administratively independent IP domainsAdministratively independent IP domains external characterization of traffic in terms of QoS external characterization of traffic in terms of QoS

parametersparameters

Virtual delay (d)Virtual delay (d) Network commodity Network commodity Standard measure of the level of the serviceStandard measure of the level of the service

Differentiated Services (DiffServ) compliant Differentiated Services (DiffServ) compliant approach to guarantee QoS (RFC 2475)approach to guarantee QoS (RFC 2475)Usage-based pricingUsage-based pricing Actually used and/or reserved network resourcesActually used and/or reserved network resources QoS charge beyond the flat access chargeQoS charge beyond the flat access charge

OMAN Network ModelOMAN Network Model

Entities involvedEntities involved

End Users Consumers needing service

Network Service Providers (NSPs) Provide the network infrastructureProvide the network infrastructure

Network Resource Manager (NRM)Network Resource Manager (NRM) Manage the domains owned by the NSPManage the domains owned by the NSP Guarantee a set of edge-to-edge services over domain Guarantee a set of edge-to-edge services over domain

Application Service Providers (ASPs)Application Service Providers (ASPs) Application service and IP connectivity to End UserApplication service and IP connectivity to End User

Information Brokers (IBs)Information Brokers (IBs) End User and ASP mediatorEnd User and ASP mediator Identifies ASPs and provides ASPs history Identifies ASPs and provides ASPs history

Resource Brokers (RBs)Resource Brokers (RBs) ASP and NSP mediatorsASP and NSP mediators

OMAN Reference EnvironmentOMAN Reference Environment

End to End Service Provisioning End to End Service Provisioning ProcedureProcedure

End user (through IB) Identifies an ASP for a specific serviceRequests service (quality of desired service and willingness to pay)


ASP Transforms customer’s qualitative requirements into quantitative technical parameters Requests RB to find the “best” path to deliver the application service (eBDL)


RB Identifies the potential domains and checks their offers with e-Table Runs an interdomain routing algorithm

e-Tablee-Table

f(d) : Technical cost of information transfer in commodity f(d) : Technical cost of information transfer in commodity unitunit

f(f(∞∞) = 0 ) = 0

αα : Cost of each commodity unit : Cost of each commodity unit Network parameters, end points, domain policiesNetwork parameters, end points, domain policies

γγ : Price variation factor : Price variation factor Market fluctuations Market fluctuations

BBres,ires,i = x = xiiPPss (0<x (0<xii<1)<1)


RB -> ASPPath foundTeriffs charged


ASP -> End user : Relevant priceEnd user -> ASP : Accept/RejectASP -> Each NAP involved : Service contract

PHY RequirementsPHY Requirements

Advanced and scalable radio transmission Advanced and scalable radio transmission technologytechnologyHeterogeneous traffic with specific QoSHeterogeneous traffic with specific QoS PHY should not be a bottleneckPHY should not be a bottleneck

Short-term trading of wireless and wired Short-term trading of wireless and wired information transport resourcesinformation transport resources Wireless: Ownership not clearWireless: Ownership not clear On demand spectral usage shared with othersOn demand spectral usage shared with others Synchronization probs (TDMA)Synchronization probs (TDMA) Combine resources with single radio front end Combine resources with single radio front end

(FDMA)(FDMA)

PHY Layer for OMANPHY Layer for OMAN

PHY layer requirements:PHY layer requirements: Single PHY channel has to support a wide range of net data ratesSingle PHY channel has to support a wide range of net data rates Re-configurable on-the-fly, to maintain QoS Re-configurable on-the-fly, to maintain QoS Support continuous and packet-oriented channels Support continuous and packet-oriented channels Mobility of terminals has to be considered.Mobility of terminals has to be considered.

PHY layer functionalityPHY layer functionality Coding according to the appropriate FEC schemeCoding according to the appropriate FEC scheme Pulse modulation by the appropriate mapping of the encoded bits Pulse modulation by the appropriate mapping of the encoded bits

onto symbolsonto symbols Insert/remove pilot symbols/preamble to/from the symbol trainInsert/remove pilot symbols/preamble to/from the symbol train Perform radio transmission and reception including Perform radio transmission and reception including

synchronizationsynchronization

UWB Characteristics UWB Characteristics

Large data rates over short distances without Large data rates over short distances without allocating dedicated spectral resourcesallocating dedicated spectral resourcesSoftware controllable parametersSoftware controllable parameters Adapt bit rate according to terminal location, Adapt bit rate according to terminal location,

propagation condition and service requirementspropagation condition and service requirements Enables highly resilient, scalable and flexible Enables highly resilient, scalable and flexible

networksnetworks

Other featuresOther features Low mean transmission power Low mean transmission power Through the wall penetrationThrough the wall penetration Precision locationPrecision location Minimized hardware complexityMinimized hardware complexity

UWB for OMANUWB for OMAN

Unsynchronized UWBUnsynchronized UWBFulfills wide range of requirementsFulfills wide range of requirements End user service contractsEnd user service contracts Dynamic domain requirements from NRMDynamic domain requirements from NRM Broad range of data rates Broad range of data rates Classes of servicesClasses of services

No sophisticated cell planningNo sophisticated cell planning Same frequency Same frequency

On the fly modification of transmission On the fly modification of transmission parametersparameters Processing gain, TH sequence, duty cycle, temporal Processing gain, TH sequence, duty cycle, temporal

pulse shape, code ratepulse shape, code rate

IR-UWBIR-UWB

Spread Spectrum technology with BW in GHzSpread Spectrum technology with BW in GHzImpulse RadioImpulse Radio

Best studiedBest studied Relatively simple implementationRelatively simple implementation Large crest factor but with low average powerLarge crest factor but with low average power

Whole band to every service providerWhole band to every service provider Improved spectral efficiencyImproved spectral efficiency Wider range of rates possibleWider range of rates possible Same equipments for all providersSame equipments for all providers Disadvantages: Disadvantages:

Synchronization not possible Synchronization not possible Power monitoring for billingPower monitoring for billing

Less affected by fadingLess affected by fading

PHY design considerationsPHY design considerations

IR with FCC regulationsIR with FCC regulations

Centralized wireless networkCentralized wireless network

Up- and down-link have the same air Up- and down-link have the same air interface definitioninterface definition

Only continuous pulse transmission with Only continuous pulse transmission with hard handovers are currently consideredhard handovers are currently considered

UWB Domain: Per Domain BehaviorUWB Domain: Per Domain Behavior

NRM functionsNRM functions Admission control able to support mobilityAdmission control able to support mobility Provide bandwidth estimationProvide bandwidth estimation

LMG: Local Mobility Gateway

UWB Domain: Admission Control UWB Domain: Admission Control FunctionFunction

Guage&Gate Reservation with Independent Probing Guage&Gate Reservation with Independent Probing (GRIP) (GRIP)

Verifies RB claims before NRM stipulates contractVerifies RB claims before NRM stipulates contract HandoffsHandoffs

UWB Domain: Bandwidth UWB Domain: Bandwidth EstimationEstimation

Discovery probe packetsDiscovery probe packets Tradeoff: Overhead v/s Information accuracyTradeoff: Overhead v/s Information accuracy

Per Domain Behavior (PDB) table Per Domain Behavior (PDB) table

UWB TransmitterUWB Transmitter

Design parametersDesign parameters Cannot be changed once the project is finalized w(t), Tm, Tc, Na, cn,k, dn,k, Np, B

Control parameters Can be varied by MAC Em, Ns, Nh, Nd

Derived parameters Values dependent on Control parameters Tf, Ps, Nc, Ts, M, K, Rs, Rb, Es, Eb

Current WorkCurrent Work

Performance degradation of UWB systems can Performance degradation of UWB systems can be analytically predicted be analytically predicted UWB DS-IR more robust against existing radio UWB DS-IR more robust against existing radio technologiestechnologiesControlled licensed mode for higher Controlled licensed mode for higher transmission powertransmission powerSpectral shaping to avoid interference Spectral shaping to avoid interference TH codes investigatedTH codes investigated Spectrogram based technique + threshold detector

Turbo encoding was found to improve performance

ReferencesReferences

www.whyless.orgwww.whyless.org

Deliverable D5_2b, “Transceiver architecture and algorithms”, Jan 2003

Deliverable D5_3b, “Physical layer architecture and performance”, Jan 2003

Deliverable D5_4b, “Ultra-Broadband coexistence (final)”, Dec 2003

network service provisioning in uwb open mobile access networks dario di sorte, student member,...

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