Title: Network Service Provisioning in UWB Open Mobile Access Networks
1Network 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 2002
Pages 1745-1753
2Outline
- WHYLESS.COM
- Open Mobile Access Network (OMAN)
- Requirements for PHY
- UWB as PHY
- UWB Domain Parameters
- Current work
3WHYLESS.COM
- Cofunded by European Union
- Current paradigmatic chain
- Infrastructure Service Terminal (user)
- Rigid prevent a quick response to changing user
needs and business models
- Open Mobile Access Network (OMAN) paradigm
- Efficient information transport
- Modern, small scale, electronic business,
evolutionary growth
- Decouples user, info transport resources, content
provision service
- Goal standardize a new commodity dealing with
the transportation of electronic information
4OMAN Concepts
- Administratively independent IP domains
- external characterization of traffic in terms of
QoS parameters
- Virtual delay (d)
- Network commodity
- Standard measure of the level of the service
- Differentiated Services (DiffServ) compliant
approach to guarantee QoS (RFC 2475)
- Usage-based pricing
- Actually used and/or reserved network resources
- QoS charge beyond the flat access charge
5OMAN Network Model
6Entities involved
- End Users
- Consumers needing service
- Network Service Providers (NSPs)
- Provide the network infrastructure
- Network Resource Manager (NRM)
- Manage the domains owned by the NSP
- Guarantee a set of edge-to-edge services over
domain
- Application Service Providers (ASPs)
- Application service and IP connectivity to End
User
- Information Brokers (IBs)
- End User and ASP mediator
- Identifies ASPs and provides ASPs history
- Resource Brokers (RBs)
- ASP and NSP mediators
7OMAN Reference Environment
8End to End Service Provisioning Procedure
- End user (through IB)
- Identifies an ASP for a specific service
- Requests service (quality of desired service and
willingness to pay)
9End to End Service Provisioning Procedure
- ASP
- Transforms customers qualitative
requirements into quantitative technical
parameters
- Requests RB to find the best path to
deliver the application service (eBDL)
10End to End Service Provisioning Procedure
- RB
- Identifies the potential domains and checks
their offers with e-Table
- Runs an interdomain routing algorithm
11e-Table
- f(d) Technical cost of information transfer in
commodity unit
- f(8) 0
- a Cost of each commodity unit
- Network parameters, end points, domain policies
- ? Price variation factor
- Market fluctuations
- Bres,i xiPs (0
12End to End Service Provisioning Procedure
- RB - ASP
- Path found
- Teriffs charged
13End to End Service Provisioning Procedure
- ASP - End user Relevant price
- End user - ASP Accept/Reject
- ASP - Each NAP involved Service contract
14Temporal sequence of interactions
15PHY Requirements
- Advanced and scalable radio transmission
technology
- Heterogeneous traffic with specific QoS
- PHY should not be a bottleneck
- Short-term trading of wireless and wired
information transport resources
- Wireless Ownership not clear
- On demand spectral usage shared with others
- Synchronization probs (TDMA)
- Combine resources with single radio front end
(FDMA)
16PHY Layer for OMAN
- PHY layer requirements
- Single PHY channel has to support a wide range of
net data rates
- Re-configurable on-the-fly, to maintain QoS
- Support continuous and packet-oriented channels
- Mobility of terminals has to be considered.
- PHY layer functionality
- Coding according to the appropriate FEC scheme
- Pulse modulation by the appropriate mapping of
the encoded bits onto symbols
- Insert/remove pilot symbols/preamble to/from the
symbol train
- Perform radio transmission and reception
including synchronization
17UWB Characteristics
- Large data rates over short distances without
allocating dedicated spectral resources
- Software controllable parameters
- Adapt bit rate according to terminal location,
propagation condition and service requirements
- Enables highly resilient, scalable and flexible
networks
- Other features
- Low mean transmission power
- Through the wall penetration
- Precision location
- Minimized hardware complexity
18UWB for OMAN
- Unsynchronized UWB
- Fulfills wide range of requirements
- End user service contracts
- Dynamic domain requirements from NRM
- Broad range of data rates
- Classes of services
- No sophisticated cell planning
- Same frequency
- On the fly modification of transmission
parameters
- Processing gain, TH sequence, duty cycle,
temporal pulse shape, code rate
19IR-UWB
- Spread Spectrum technology with BW in GHz
- Impulse Radio
- Best studied
- Relatively simple implementation
- Large crest factor but with low average power
- Whole band to every service provider
- Improved spectral efficiency
- Wider range of rates possible
- Same equipments for all providers
- Disadvantages
- Synchronization not possible
- Power monitoring for billing
- Less affected by fading
20UWB Number of Users
Number of users versus power increase of each
user for different target bit error rates for unc
oded transmission and 384 Kb/s single user data
rate.
21PHY design considerations
- IR with FCC regulations
- Centralized wireless network
- Up- and down-link have the same air interface
definition
- Only continuous pulse transmission with hard
handovers are currently considered
22UWB Domain Per Domain Behavior
- NRM functions
- Admission control able to support mobility
- Provide bandwidth estimation
LMG Local Mobility Gateway
23UWB Domain Admission Control Function
- GuageGate Reservation with Independent Probing
(GRIP)
- Verifies RB claims before NRM stipulates
contract
- Handoffs
24UWB Domain Bandwidth Estimation
- Discovery probe packets
- Tradeoff Overhead v/s Information accuracy
- Per Domain Behavior (PDB) table
25UWB Transmitter
- Design 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
26Current Work
- Performance degradation of UWB systems can be
analytically predicted
- UWB DS-IR more robust against existing radio
technologies
- Controlled licensed mode for higher transmission
power
- Spectral shaping to avoid interference
- TH codes investigated
- Spectrogram based technique threshold detector
- Turbo encoding was found to improve performance
27References
- www.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