Standard Parameters for Wimax System

8/3/2019 Standard Parameters for Wimax System

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Standard Parmeters

WiMAX System (normal)


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Multiple ISP Network


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Time Division Duplex Configurable Uplink vs Downlink Bandwidth Base sectors time synchronized

CPE time & frequency slaved to base

Uplink Access Implicit Reservation

Explicit Reservation for isochroous traffic (VoIP)

Slot size matched to minimum Ethernet packet

FEC plus ARQ error control

Downlink Data

Byte stream with embedded uplink control FEC error control

Medium Access Control


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Modulation Method Coded OFDM

Systems patented transmission protocol 811 individual carriers

4, 16 or 64 point constellation per carrier

Pilot carrier channel equalization

No recurring training sequence necessary 1/8 cyclic prefix

rate convolutional inner code

Low redundancy Reed-Soloman outer code (84,74,8)

One OFDM symbol per time slot Transmission symbol optimized for smallest Ethernet

packets


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Transceiver Performance Static Performance

5 dB C/N for packet error rate < 10^-4 (4 QAM)

5 dB C/I (co-channel) for packet error rate < 10^-4

Multipath Performance

< 9 dB C/(N+I) for worst case expected (4 QAM)

System Parameters Transmitter Power >= 2 W

CPE Maximum averaged EIRP < 2 W

Receiver Sensitivity 4 QAM -96 dBm

16 QAM -90 dBm

64 QAM -83 dBm

16 QAM lite -76 dBm

System Gain = 160 dB (4 QAM, 18 dBi base station antenna gain)


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VoIP differentiated service

Explicit bandwidth reservation for VoIP calls

Support for SIP signaling

Simultaneous VoIP and broadband data traffic

support External VoIP gateway or IP phone

VoIP provisioning

CPE is assigned to a Voice Service Profile On / Off

Up to three SIP server addresses

Voice over IP support


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VoIP G.729 performance

74-byte packets (20 bytes of data) every20ms.

packets compressed to 33 bytes.

packet compression - 55%

Bandwidth for continuous voice -

16.1Kbps

Bandwidth for silence - 2.5 Kbps

uplink bandwidth reservation efficiency -

99.9%


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VoIP G.729 performance

74-byte packets (20 bytes of data) every20ms.

packets compressed to 33 bytes.

packet compression - 55%

Bandwidth for continuous voice - 16.1Kbps

Bandwidth for silence - 2.5 Kbps

uplink bandwidth reservation efficiency -99.9%


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Supporting Material


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CPE BaseStation

REG req

Permission Vector CPE Authorization Rsp

AP Server

CPE REG cdr

ISP Provisioning

CPE Authorization Req

REG conf

Host PC

2

Ethernet

CRM Application

Add CPE

return

1

CPE Authorization Sequence

NextNet Airlink

NextNet back-haul network ISP Network

TCP/IP session XML XML


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CPE BaseStation

REG req

Permission Vector

AP Server

CPE REG cdr

ISP Provisioning

REG deny

Host PC

1

CPE Authorization Failure

2

REG req CPE REG cdr CPE Authorization Req

CPE Authorization DeniedPermission VectorREG deny


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CPE BaseStation

DHCP dialog

Host Registration CDR

AP Server ISP ProvisioningHost PC

1

IP Host Registration

DHCP Server

IP Host Notification2


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NextNet Base StationDownlink Data Queuing

receive

data from

Ethernet

Classify Frame

802.1QARPIPIP PriorityUDPDHCPTCPSNMPWin Network

tolocal stack

(managementVLAN)

Ingress Filtering

802.1Q tag striphost access bridging rulesprotocol filters:Win Net, etc

VoIP Call Identification

synchronous

service

Forwarding Process

head end redirection

ARP proxy

datagram

service

Relay IngressTask

Relay

Service

Queues

Egress Filtering

transit timeoutCPE db update

bitbucket

low priority

high priority

Relay EgressTask

MAC Layer

Service Access

Points

managementservice

synchronousservice

registrationservice

datagram

service

transmit

data

via

Airlink

bridged datafrom upstream

Base Station Downlink Data Queuing


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CPE Uplink Data QueuingNextNet CPE DeviceUplink Data Queuing

receive

data from

Ethernet

Classify Frame

802.1Q

ARP

IP

IP Priority

UDP

DHCP

SIP

TCP

TCP ackWin Network

to

local

stack

Ingress Filtering

802.1Q tag strip

host access bridging rules

protocol filters:

Win Net, H.323, etc

M-cast and B-cast shapingVoIP Call Identification

synchronousservice

Forwarding ProcessARP proxy

datagram

service

Relay Ingress

Task

MAC Layer

Service AccessPoints

management

service

synchronous

service

registration

service

datagramservice

Relay

Service

Queues

transmitdata

via

Airlink

Egress Filtering

transit timeout

bandwidth shapingVoIP header compression

bit

bucket

low priority

high priority

Relay Egress

Task


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Uplink Transmission

Transmission Frame

Uplink Slots219.407 usec/slot

Frame Duration ~2.304 msec in this example. Typical duration ~3.620 msec with additional symbols and slots.

6

Downlink Transmission

Downlink OFDM Symbols164.555 usec/symbol

b d fFH

UCS1

aUCS2

UCS3

cUCS4

UCS5

eUCS6

54321

Slot time scales with bandwidth

Time Division Duplex


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Frame Header 9 bytes Frame Flag

System Identifier

Transmitter Power level

Base Station Address

Ratio of Uplink toDownlink slots

Maximum modulation rate

Synchronous session full

Maximum range Busy bit

Uplink Channel

Status 6 bytes Subscriber Address

Slot in use

Ack

Preempt

QOS level

Frame Parameters


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Destination

Address

4 bytes

Source

Address

4 bytes

Length/

Type

2 bytes

Data

60, 134, 208 or 282 bytesCRC32

First Packet of Message

Destination

Address4 bytes

Data

66, 140, 214 or 288 bytes CRC32

Any Additional Packets of Message

Uplink MAC Packets


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flag

Desti-

nation

Address

4 bytes

Source

Address

4 bytes

flag

Data up to 2 k by tes CRC32

Length/Type 2 bytes

Packet transmitted as a byte stream

Downlink MAC Packets


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Capacity Calculation

Number of carriers 811

Ratio of Pilot carriers 1/6

Number of carriers with Data + FEC 676 4 QAM 16 QAM 64 QAM 16 QAM light

Transmitted Data + FEC bits 1352 2703 4055 2703

Transmitted Data + RS code (take away 1/2 rate code) bits 676 1352 2028 2703

Transmitted Data (take away RS (84,74,8) code) bits 595 1191 1786 2382

Transmitted Data - bytes / OFDM symbol 74 149 223 298

Upstream rate (symbol time = 219.407 usec in 6MHz channel) 2,713,573 5,427,147 8,140,720 10,854,293 bits / sec

Downstream rate (symbol time = 164.555 usec in 6 MHz chann 3,618,103 7,236,207 10,854,310 14,472,413 bits / sec


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Downstream Data RateDownlink

1514 Bypass

Min 3 slots of 4 QAM 99.02% 4 QAM 16-QAM 64-QAM 16-QAM

164.5714 164.5714 219.429 219.4286 Basic x 1 2.00 3.00 4.00

74 148 222 296

DLB DLS ULS Frame (ms) Super Fr DL rate Calc calc Calc

0 6 6 2.304 434 1,337,358 2,100,580 2,863,803 3,627,025

1 9 6 2.798 357 1,719,413 2,975,037 4,230,661 5,486,2842 14 6 3.621 276 2,127,308 3,906,987 5,686,667 7,466,347

3 17 6 4.114 243 2,294,515 4,288,741 6,282,967 8,277,193

4 20 6 4.608 217 2,425,466 4,587,929 6,750,392 8,912,856

5 23 6 5.102 196 2,530,766 4,828,640 7,126,514 9,424,388


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Upstream Data RateUplink

4 QAM 16-QAM 64-QAM 16-QAM By

8 Packets of 1514 24 11 8 6

164.5714 164.5714 219.4286 219.4286 MAC+pay -> 74 148 222 296

14 Initial pay -> 60 134 208 282

8 add'l pay -> 66 140 214 288

DLB DLS ULS Frame (ms) Super Fr

0 6 6 2.304 434 1,369,704 2,905,117 4,442,424 5,978,784

1 9 6 2.798 357 1,126,692 2,389,693 3,654,252 4,918,0322 14 6 3.621 276 871,056 1,847,494 2,825,136 3,802,176

3 17 6 4.114 243 766,908 1,626,598 2,487,348 3,347,568

4 20 6 4.608 217 684,852 1,452,559 2,221,212 2,989,392

5 23 6 5.102 196 618,576 1,311,988 2,006,256 2,700,096

Bytes sent 1,578 1,534 1,706 1,722

Packet efficiency 95.94% 98.70% 88.75% 87.92%

DLB0 1,314,152 2,867,241 3,942,456 5,256,608

1 1,080,996 2,358,537 3,242,988 4,323,984

2 835,728 1,823,407 2,507,184 3,342,912

3 735,804 1,605,391 2,207,412 2,943,216

4 657,076 1,433,620 1,971,228 2,628,304

5 593,488 1,294,883 1,780,464 2,373,952

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Standard Parameters for Wimax System