WipLL Presentation

© Airspan Networks Inc.

WipLL Presentation


Contents

• WipLL- what is it?

• WipLL physical layer

• WipLL MAC protocol

• WipLL Applications

• WipLL Roadmap

• WipLL Vs other WLL products

• WipLL Vs xDSL

• WipLL Case Study


WipLL – what is it?

WipLL = Wireless IP Local Loop

WipLL = IP based Broadband Fixed Wireless Access System


WipLL: Main Features(1)

• Designed explicitly for Broadband Fixed Wireless Access applications

• High capacity Point to Multi-Point system

• Integrated services on a single platform using a single protocol: • Data

• Voice

• Modular structure

• High effective throughput of up to 80%

• Network Management (SNMP), remote configuration and S/W down load


•Air link based on Frequency Hopping CDMA (FH-CDMA) scheme

• Operates in:– 2.4 GHz ISM band– 3.5 GHz– Other bands: ready for trials

•Operating range exceeds 10 km (LOS)

•Bandwidth Management: MIR, CIR, Fairness



• Rich networking package:– IP routing– PPPoE bridging

– IP filters: security based on:• IP addresses• Protocols: ICMP, UDP, TCP• Applications or TCP/UDP port numbers: WEB, E-mail, FTP, etc

– QoS based on:• IP addresses• Protocols: PPPoE, IP, ICMP, UDP, TCP• Applications or TCP/UDP port numbers: WEB, E-mail, FTP, etc

– 802.1Q/p for:• Traffic engineering• VPNs • End-to-end QoS

– DiffServ/TOS for end-to-end QoS



WipLL – Physical Layer

Frequency Bands

Frequency Hopping Spread Spectrum

Standards Compliance

Modulation

System Parameters

Antennas

Link Budget

Frequency Reuse


Frequency Bands

• Support of various sub 11GHz bands including:

– 2.4GHz (Licensed Exempt ISM) TDD

– 3.5GHz FDD

– Variety of versions available for trials, such as: • 3.4-3.8 TDD/FDD

• 2.5GHz (MMDS)


Frequency Hopping Spread Spectrum (FHSS)

• What is Frequency Hopping Spread Spectrum?

– Spread Spectrum• Encoding method that uses a process other than the information

signal to expand, or spread, the bandwidth of the signal.

– Frequency Hopping Spread Spectrum (FHSS)• The carrier frequency at which the information signal is transmitted is

rapidly changed according to a predefined spreading code. This type of spreading is implemented in WipLL


FHSS Advantages

• Interference rejection

• Spectrum flexibility - no need for contiguous frequencies

• Coexistence with other systems – Bluetooth and such

• Low Probability of Interception (LPI) – eavesdropping protected


Frequency Hopping Channel Arrangement

• Operator’s RF Channel - divided into multiple sub channels

• 1MHz sub channel spacing

• Sub channels are arranged in a hopping sequence


Frequency Hopping Channel Arrangement (Cont’d)

• WipLL Spectrum mask complies with ETSI standard EN 301 021

• 20dB point channel bandwidth is 1MHz or 1.33MHz depending on system mode


Standards Compliance

• 3.5 GHz– ETSI EN 301 253 (FH-CDMA)– ETSI EN 301 021

• 2.4 GHz– ETSI ETS 300 328– FCC part 15– Telec


Modulation

• Multi level (8) Frequency Shift Keying (FSK)

• Adaptive modulation based on RSS and BER

• Two modes of operation in terms of symbols per second:• 4Mbps / 1.33 Mbps• 3Mbps / 2Mbps / 1Mbps

• The modes are software selectable by the operator


Modulation – Raw Data Rates

Modulation Bits/symbol Mode (Msps) Rate (Mbps)

2-FSK 1 1 1

1.33 1.33

4-FSK 2 1 2

8-FSK 3 1 3

1.33 4


System Parameters

• Frequency Bands: 2.4GHz (ISM), 3.4 – 3.8GHz, 2.500-2.686GHz (MMDS)• Radio Technology:FHSS• Duplex mode: TDD/FDD (50 or 100 MHz duplex spacing)• Multiple Access Method: Adaptive TDMA using WipLL proprietary PPMA protocol• Channel Bandwidth: 1MHz/1.33MHz

(as measured at 20dB points)• Sub – Channel Spacing: 1MHz• Output power: 28±2 dBm• Power control: Remote and Auto Power Control (RTPC, ATPC)• Receiver Sensitivity: -90/ -83/ -75 dBm

(BER 10-5, @ 2FSK/4FSK/8FSK)• Carrier to Interference: 12/ 22/ 28 dB

(BER 10-5, @ 2FSK/4FSK/8FSK)• Data Rate: 4Mbps max.• Modulation: Multi level FSK• Spectral Efficiency: 3 bit/sec/Hz


WipLL Antenna System

• BSR and SPR/IDR – Integrated solution: • Integral flat printed antenna • No RF Cable involved• BSR and SPR: ODU / IDU interface: standard CAT5 • IDR: Fully Indoor

• Polarization: • Vertical • Horizontal – release 4.0

• Receive diversity at BSR - dual integral antennas• External antenna option

• N type connector for both BSR and SPR• TNC connector for IDR


External Antennas

Reasons for external antenna:

• Reducing BS cost– Minimum BS: SDA, BSR and Omni antenna

• Supporting different Sectorization Scheme (4*90º, 3*120º)

• Improving link budget (higher gain)

• Various polarizations


BSR Antenna Pattern EnvelopeEuropean Standard EN 302 085 CS1

• Gain 12dBi

• HPBW: 60ºx20º

BSR 3.5GHz A-Plane BSR 3.5GHz E-Plane

Azimuth Elevation

* Each ring corresponds to 5dB attenuation


SPR Antenna Pattern EnvelopeEuropean Standard EN 302 085 TS1

• Gain 15dBi/ 18dBi (18dBi option is available for 2.4GHz band only)

• HPBW: 20ºx30º

SPR 3.5GHz A-Plane SPR 3.5GHz E-Plane

Azimuth Elevation

* Each ring corresponds to 5dB attenuation


Link Budget Example (3.5GHz)• Transmitter

Tx Power 28dBmInternal losses -2dBTx Antenna Gain 12dBiTx EiRP 38dBm

• ReceiverRequired SNR (2FSK) 14dBRx Antenna Gain 15dBiInternal losses -2dB

• NoiseNF 10dBBandwidth (1Msps) 1MHzNoise Level -104dBm

• Fade Margin (99.99% availability) 16dB• Required RSS level -87dBm• Allowable path loss 125dB• System Range (Free Space Propagation) 12Km


Frequency Reuse

• Frequency reuse of FWA system depends on various parameters such as:– C/I– Sectorization scheme and antenna pattern– Propagation model considered– Performance goals (coverage, availability)

• Reuse N=3 assuming:– typical propagation model (Erceg)– 90% coverage @ 8-FSK modulation


Radio Planning

• Based on off the shelf software (Hexagon)– MapInfo as a GIS platform– Variety of digital map formats supported– Coverage and Interference Analysis– Capacity Module– Automatic Frequency Allocation Algorithm


WipLL air MAC Protocol


• PPMA (Preemptive Polling Multiple Access Protocol ) :

– Adaptive TDMA

– Centrally coordinated

– Knowledge of available and required resources

– Intelligent polling of users

– Optimized for time bounded applications

– Supports 126 users (CPEs) per each Base Station Radio (BSR)

WipLL Air Protocol


Quality of Service – built in PPMA• The ability to recognize the type of the transmission and assign

bandwidth and other resources accordingly

• Used by BSR when allowing access to different SPRs

WEB Browsing

E-mail

File Transfer

Voice over IP

FTP


Efficient Packet transmission within PPMA

• Data packets are cut into fragments

• The length of the fragments is dynamic according to BER

• CRC is calculated for every fragment

• Re-transmissions are done on fragments only !


WipLL Target Market Sectors

Residential

SOHO

SME


Who buys WipLL?

Customers:

Operators ISPs Utility companies

Opportunities: Rural, sub urban and urban areas Developed and developing countries Complementary solution for ADSL or CATV


WipLL Components

Base S tation

SectorBase S tation

S ite

Subscribers


BSRSDA

CAT5

OMNI DirectionalAntenna

10BT

Base Station Site - Minimum Configuration

WipLL Components


Interface unit (e.g. Router, Switch)

WipLL Components

Base Station Site - Basic Configuration

IP ATM Other

BSR

BSDU

-48Vdc

100baseTBSPS

BSR BSR BSR BSR BSR

GPS


BSR

BSDU

BSR BSR BSR BSR BSRBSR

BSDU

BSR BSR BSR BSR BSRBSR

BSDU

BSR BSR BSR BSR BSR

WipLL Components

Base Station Site - Maximum Configuration

BSR

BSDU

-48Vdc

100baseTBSPS

BSR BSR BSR BSR BSR

GPS

IP ATM Other

Interface unit (e.g. Router, Switch)


WipLL Components

SPR

SDA 100-240Vac

Subscriber Premises Site:Single Subscriber


WipLL’s IDR

Power Supply Unit

IDR 100-240 Vac

Subscriber Premise Site: IDR (with external antenna)

PC

To BSR External antenna

RFCable


Operations and Management Systems

WipManageTM - network elements manager: User friendly GUI Windows based – runs on PC Works in conjunction with Access DB Configuration (QoS, security, routing, etc) Performance monitoring Trap management Software upgrade Multi Device operation

WipConfigTM - local configuration tool Runs on PC and on PDA (new!)


WipLL Applications

IP Routing and PPPoE bridging

WipLL and ATM: Traffic Engineering

WipLL VPNs


SPR

Base Station Site

1

n

BSR

RAG

SDA

PPPoE clients

SDA

PPPoE clients

PSTN

Backbone:IP / ATM / FR / MPLS

SDA

SPR

SPR

BSDU

10BaseT

BSDU

BSDU

BSDU

Router / switch

BSPS

GPS

HEG+

Gatekeeper

WipLL using PPPoE for Internet access and IP for VoIP

Router / Switch

PPPoE server

(BRAS)

Internet


SPR: VLAN 60

Base Station Site

1

n

BSRSDA

SDA

ATMNetwork

SDA

SPR: VLAN 80

BSDU

10BaseT

BSDU

BSDU

BSDU

ATM switch

BSPS

Power

GPS

WipLL in ATM based network: ATM Switch converts 802.1Q to VCs

SDA

SPR: VLAN 60

SPR: VLAN 80

VC # 1

VC # 2

SPRs mark VLAN IdsATM switch maps:VLAN 60 VC#1VLAN 80 VC #2


SPR#1: VLAN 60

Base Station Site

1

n

BSRSDA

SDA

IP backbone

SDA

SPR#3: VLAN 80

BSDU

10BaseT

BSDU

BSDU

BSDU

IP router

BSPS

Power

GPS

Using 802.1Q for VPNs

SDA

SPR#4: VLAN 60

SPR#2: VLAN 80

SPR#1, SPR#4 use VLAN ID 60SPR#1, SPR#4 use VLAN ID 80

SPR#1, SPR#4 are in branches of one clinicSPR#2, SPR#3 are inbranches of another clinic


WipLL Roadmap


WipLL roadmap – contents (1)

• WipLL 4.0 – contents

– Improvements for VoIP support

– PDA: General release

– BSDU FE ports – support all modes

– Software support for MMDS and 3.X TDD/FDD – for trials

– Auto Download


WipLL roadmap – contents (2)

• WipLL 4.2 – contents

– 3.5 GHz: 1.75MHz, Power Control

– Battery back/up solution for CPE

– Sleep mode for CPE

– Admission control


WipLL Vs other WLL vendors


WipLL: advantages in all OSI layers – layer I

• WipLL: Cables between Outdoor Unit to Indoor Unit are standard CAT 5 Ethernet cables – in CPE and in Base Station

• Competitors use IF or RF cables

– WipLL’s physical installation is more cost effective

– WipLL’s physical installation is easier


WipLL: advantages in all OSI layers – layer I

• WipLL: Modular Base Station architecture

Min: BSR+SDA, Max: 24BSRs+4 BSDUs

Add BSRs when needed, add BSDUs when needed

• Competitors use chassis based architecture

– WipLL: more flexible

– WipLL: pay as you grow

– WipLL’s Base Station saves money and space


WipLL: advantages in all OSI layers – layer II

• WipLL: PPMA MAC protocol is extremely efficient:

– 80% utilization

– Efficiency does not decrease with number of CPEs

– No collisions

– Was planned especially for WLL (not imported from W-LAN)

– Equal chance of near and far users

– Built in QoS: ideal for all applications, including VoIP


WipLL: advantages in all OSI layers – layer II

ChannelUtilization

4 5 7 86 9 40 Number OfSubscribers

20%

80%85%

CSMA

PPMA

75%


WipLL: advantages in all OSI layers – layer III

• WipLL is both IP router and PPPoE bridge

• Most competitors: bridging only

– IP routing is more efficient

– Inherent IP routing often saves additional hardware

– Inherent IP routing simplifies the network management: One NMS for for the WLL system and for routing


WipLL: advantages in all OSI layers – layers II-VII

• Enhanced QoS based on addresses, protocols and applications

• Enhanced IP filters based on addresses, protocols and applications

• Rich networking package:– 802.1p/Q– DiffServ/TOS Interoperability Traffic engineering Security


WipLL and xDSL


WipLL and xDSL

• xDSL depends on existence of copper

• Quality of copper and width of copper are varying in different locations

• xDSL has difficulties in providing a similar level of service to customers (different bandwidth in different distance)

• xDSL suffers from high initial costs and high cost of DSLAM

• Maintenance costs of xDSL are high

• xDSL supports only limited distances

• ADSL does not fit business customers because of asymmetry

• ADSL does not fit symmetric applications (like Video games)


WipLL and xDSL

• WLL: no need for copper, no dependency on reliability of copper

• WipLL’s Base Station is much more modular than a DSLAM

• WipLL has lower initial costs than xDSL solutions

• WLL: less maintenance costs

• Longer distances: WipLL can reach more than 10KM, xDSL is for short distances only

• WipLL is ideal for Residential and business customers

• WipLL is ideal for all applications: symmetric, asymmetric


WipLL and xDSL – some ideas

• xDSL cannot serve as the only solution:

– Use WipLL for ‘low initial costs start’

– Use WipLL for remote subscribers

– Use WipLL as infill for xDSL (in xDSL projects often the coverage reaches only 70%)

– Use WipLL for business customers


WipLL Case Study


SpeedNet Project: Japan

• Customer: utility company• Service: high speed Internet for residential end users• Current contract: 30,000 end users• Already connected: 20,000 end users• Motivation: utilization of existing Fiber-Optic Backbone

• Micro cell concept:– BSRs are installed on electric poles – Using external omni antenna

• Features in use:– Auto Connect– PPPoE bridging– Fairness


Base Station on a pole

BSR is in the

Outdoor Enclosure


BSR (E)

Optical to EthernetConvertor (A)

Power Supply (B)Omni-directionalAntenna (D)

External Surround for Product Assembly (C)

-48 VDC

10BT

WipLL – BSR on pole


BSR on a Pole


External Antenna on the pole


You are now a WipLL expert - thanks !!

WipLL Presentation

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