1xEV DO Technical Overview

8/3/2019 1xEV DO Technical Overview

1/41

2 MAR | Re |08/00 |

1

John Bowne 2/25/02 2002 Wireless Symposium - 1xEV-DO - Technical Overview

1xEV-DO Technical Overview


2/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


1xEV-DO Technical OverviewAgenda

What is 1xEV-DO?

Terminology

Timeline

Misconceptions

Overview

Protocol Stack

Physical Layer Channel Overview

Forward Link

Reverse Link

Measurement OverviewQuestions and Answers


3/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


What is 1xEV-DO?Terminology

1xEV-DO is also known as:

HDR

cdma2000-1x Evolution Data Oriented/Optimized/Only

TIA IS-856

3GPP2 C.S0024

AN (Access Network) is the new term for base stationAT (Access Terminal) is the new term for the mobile device

Forward Link AN transmits to the ATs

Reverse Link AT transmits to the ANs


4/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


What is 1xEV-DO?Development and Deployment Timeline

1/1997 12/2002

1/1998 1/1999 1/2000 1/2001 1/2002

9/1998

HDR Live Demo @ PCS '98

12/1998

Milestone Description

8/1997HDR Concept Presentation to CDG

5/2002

Public Deployment in Korea

10/2000

IS-856 Standard Approved

5/2000

HDR Proposed to CDG as 1xEV-DO

6/1999Sprint PCS 1xEV-DO Lab Trial

4/1999

US West Lab Trial

10/1999

1xEV-DO Open Air Network

1/20001xEV-DO Open Air Capacity Tests

1/1997


5/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


What is 1xEV-DO?Misconceptions

Misconceptions

1xEV-DO is a sub/superset of cdma2000 1x

1xEV-DO uses the same protocol stack as cdma2000 1x

1xEV-DV will be an upgraded version of 1xEV-DO

Reality

1xEV-DO shares the chip rate and bandwidth of 1x cdma2000

A number of internal components of cdma2000 are used, but notidentically

The protocol stack uses some common terminology, but it is different

Common timing system with cdmaOne and cdma2000

However 1xEV-DO contains provisions to allow for handoffs to cdma2000 1x

Future revisions of cdma2000 1x will support handoffs to 1xEV-DO


6/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


What is 1xEV-DO?Overview

1xEV-DO is a TDMA system Uses CDMA-like principles for information coding, and addressing

AN transmits at a constant output power

Channels are differentiated by timing, Walsh encoding and preambles Pilot is a periodic burst that occurs multiple times within a frame (Fwd)

MAHO are used, however soft handoffs are not used An AT receives data from a single AN

An AT monitors the Pilot and MAC from visible ANs AT makes the decision of which AN to receive data from

AT specifies forward link data rate, dynamically

Multiple ANs may receive data from the AT

The forward link transmits only a single channel at a time With the exception of the Pilot and MAC channels

The reverse link transmits up to 4 different channels simultaneously

Forward link data rates to 2.4 Mbps

Reverse link data rates to 153.6 Kbps


7/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


What is 1xEV-DO?Protocol Stack

Stream Layer

Session Layer

Connection Layer

Security Layer

MAC Layer

Physical Layer

Application Layer

Default Packet Application

Physical Layer Protocol

Control ChannelMAC Protocol

Forward TrafficChannel MAC

Protocol

Access ChannelMAC Protocol

Reverse TrafficChannel MAC

Protocol

Security ProtocolKey

ExchangeProtocol

Authentication

Protocol

Encryption

Protocol

Packet

ConsolidationProtocol

Route UpdateProtocol

Overhead

MessageProtocol

SessionManagement

Protocol

AddressManagement

Protocol

SessionConfiguration

Protocol

Stream Protocol

Air Link

ManagementProtocol

InitializationState Protocol

Idle StateProtocol

Connected StateProtocol

Default Signaling

Application

Signaling Link

Protocol

SignalingNetworkProtocol

Test Application

Reverse TestApplication

Protocol

Forward TestApplication

Protocol

Radio Link

Protocol

LocationUpdate

Protocol

Flow Control

Protocol


8/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Channel Overview

An overview of the various channels within 1xEV-DO

Definitions

Forward and reverse link channels

Channel view diagram

Single and multiple ANs

Forward Link overview

Forward Link Rate Control

Reverse Link overview

RL Power Control

Reverse Link Rate Control


9/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Channel OverviewDefinitions

Forward Link Channels Pilot

DRCLock

Data Rate Control Lock Channel

RPC

Reverse Power Control Channel

RAB

Reverse Activity Bit Channel

Data

Reverse Link Channels Pilot

RRI

Reverse Rate Indicator Channel

DRC

Data Rate Control Channel

ACK

Acknowledge

Data


10/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Channel OverviewAll channels Single AN

TDMCDM

AN

(Access Network)

TDM at slot boundaries

TDM within slot

ACK

DRC

Pilot

RRI

DATA

1xEV-DO

AccessTerminal

TDM

MAC

Pilot

RPC1

DRCLOCK1

RAB

RPCN

DRCLOCKN

TDM

TDMCDM

DataTDM DATA

N

DATA1

TDM within slot

CDM via MACIndex

CDM via fixed Walsh codes


11/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Channel OverviewAll channels Multiple ANs

TDMCDM

AN - B

AN - A

TDM at slot boundariesTDM within slot

ACK

DRC

Pilot

RRI

DATA

1xEV-DO

AccessTerminal

TDM

MAC

Pilot

RPC1

DRCLOCK1

RAB

RPCN

DRCLOCKN

TDM

TDMCDM

DataTDM DATA

N

DATAX

TDM

MAC

Pilot

RPC1

DRCLOCK1

RAB

RPCN

DRCLOCKN

TDM

TDMCDM

DataTDM DATA

N

DATA1

TDM within slot

CDM via MACIndex

CDM via fixed Walsh codes


12/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Channel OverviewForward Link

TDMCDM

AN - B

AN - A

ACK

DRC

Pilot

RRI

DATA

1xEV-DO

AccessTerminal

TDM

MAC

Pilot

RPC1

DRCLOCK1

RAB

RPCN

DRCLOCKN

TDM

TDMCDM

DataTDM DATA

N

DATAX

TDM

MAC

Pilot

RPC1

DRCLOCK1

RAB

RPCN

DRCLOCKN

TDM

TDMCDM

DataTDM DATA

N

DATA1

AT acknowledges

successful receipt of

data packet 4

Indicates that the DRC

subchannel is being

received properly 1

AT requests forward

rate and serving sector

2

Data delivered

using specified

rate and sector

3


13/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Channel OverviewReverse Link

TDMCDM

AN - B

AN - A

ACK

DRC

Pilot

RRI

DATA

1xEV-DO

AccessTerminal

TDM

MAC

Pilot

RPC1

DRCLOCK1

RAB

RPCN

DRCLOCKN

TDM

TDMCDM

DataTDM DATA

N

DATAX

TDM

MAC

Pilot

RPC1

DRCLOCK1

RAB

RPCN

DRCLOCKN

TDM

TDMCDM

DataTDM DATA

N

DATA1

Reverse Link is power

controlled to optimize

levels at AN(s). 1

AN(s) requests to lower

reverse data rates. 2

AT specifies Reverse Link rate.3a

AT sends packet to AN(s) 3b


14/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Physical LayerForward Link

Forward Link Topics

Timing

Physical Structure

Operation Overview

Channel Description

Coding

Spreading Modulation


15/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Forward LinkTiming Structure

Source

Like cdma2000, all AN timing is derived from a GPS reference (PP2S)

Hierarchy Control Channel cycle

426.67 ms duration

Control Channel broadcast once per cycle Frames

26.67 ms duration

16 Frames per Control Channel cycle

75 Frames per 2 second period (PP2S)

Slots 1.67 ms duration

16 Slots per frame

2048 PN chips per slot


16/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Forward LinkTiming Structure (continued)

Forward Link Details

PN offset used to differentiate Pilots (Sectors and/or Base stations)

Rollover point of the I and Q PN generators is different than cdma2000 and1xEV-DO access terminals

Frames aligned to PP2S edge (and zero offset PN rollover)

The Slot is split into 2 Half Slots

0.83 ms duration

1024 PN chips per half slot

800 Data chips (in two 400 chip regions)

128 MAC channel chips (in two 64 chip regions)

96 Pilot chips


17/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Forward LinkTiming / Physical Structure

PP2SPulse Per 2 Second

n-1 n n+1 n+2

75 Frames

2 seconds

16 Slots

26.67 ms

1.67 ms

1 Slot (2048 chips)

1 Half Slot (1024 chips)

...1 0(15)1...

Zero Offset I & QPilot PN Sequence

Rollover

Data

400chips

Data

400chips

Pilot

96chips

MAC

64chips

MAC

64chips

...1 0(15)1...

Frames26.67 ms period

Slots1.67 ms period

Half Slots0.83 ms period

Chips1.2288 MHz chip rate

813.8 ns chip period


18/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Forward LinkOperational Overview

No simultaneous transmissions i.e. only a single data stream is transmitted

Each subchannel is defined by TDMA principles The entire output of the base station is dedicated to a specific AT

Except

Simultaneous power control to active mobiles in the MAC subchannel

Overhead messages

Pilot Channel

MACIndex is a selector that specifies an active AT

Packets sent by the AN use an integral number of slots (preamble + data length + pilot + MAC) mod 2048 = 0


19/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Forward Link

Channel Descriptions

Pilot Used as a timing reference and a beacon to multiple ATs

MAHO is performed by the AT using pilots from multiple ANs No information content other than a relative PN offset

MAC

The only code domain encoded signal on the forward link A single bit per code channel per slot is transmitted

Sub Channels

RAB Reverse Activity Bit

MACIndex = 4

Update rate of the bit is configurable (from 8 to 64 slots) Indicates to the ATs that they should raise or lower the reverse data rate

Not absolute, final decision is statistically based


20/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Forward Link

Channel Descriptions (continued)

MAC (Continued) Sub Channels (Continued)

RPC Reverse Power Control MACIndex from 5 to 63

Individual power control bits to active ATs (via their MACIndex)

Single power control bit per slot (600 Hz update rate)

If (RPC == 0) then AT increases power else AT decreases power

DRCLock Data Rate Control Lock

Replaces the RPC bit on a periodic basis (TDM)

Indicates that the AN is unable to receive the DRC channel from the AT

If (DRCLock == 0) then AT may not point at that specific AN

This is a recent change to the 1xEV-DO specification (C.S0024 v2.1)


21/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Forward Link

Channel Descriptions (continued)

Data Preamble

Used to address a physical packet to a specific AT (via the MACIndex) Using a bi-orthogonal W32 cover

MACIndex from 5 to 63

Length depends on data rate

Traffic Data rates from 38.4 to 2457.6 Kpbs

Packet sizes from 1024 to 4096 bits (Using 1 to 16 slots per packet)

Packets requiring more than 1 slot must be use an interleave factor of 4

Control Data rates from 38.4 to 76.8 kbps (Using 8 or 16 slots per packet)

Packet size is 1024 bits

Formatted exactly as a traffic frame Differences exist in upper layers

MACIndex 2 (38.4 kbps) or 3 (76.8 kbps)

Control channel packets must be started within the first 4 slots of the controlchannel cycle


22/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Forward Link

Traffic/Control Channel Framing Details1 Slot (2048 chips)

1 Half Slot (1024 chips)

Data

400chips

Data

400chips

Pilot

96chips

MAC

64chips

MAC

64chips

Half Slots0.83 ms period

Chips1.2288 MHz chip rate813.8 ns chip period

1024

512

256

128

64

614.4 kbps 1

2457.6 kbps

1843.2 kbps

1228.8 kbps

614.4 kbps

307.2 kbps 1

76.8 kbps 738.4 kbps 15

1228.8 kbps 1

921.6 kbps 1

307.2 kbps 3

153.6 kbps 3

1024 1/5 QPSK 16 5761024 1/5 QPSK 8 1088

1024 1/5 QPSK 4 1344

1024 1/5 QPSK 2 1472

1024 1/3 QPSK 1 1536

2048 1/3 QPSK 4 1472

2048 1/3 QPSK 2 1536

2048 1/3 QPSK 1 1536

3072 1/3 8-PSK 2 1536

3072 1/3 8-PSK 1 1536

4096 1/3 16-QAM 2 1536

4096 1/3 16-QAM 1 1536

400 chips 400 chips 400 chips 400 chips16000

Preamble

PacketSize

ModulationType

Chips inthis slot

CodeRate

TotalSlots

1. Preamble always starts on a full slot boundary

2. MACIndex encoded as W32 on I channel only

Packets requiring

multiple slots use a 4slot interlace system.

Control

Traffic

Y Y

Y Y

Y N

Y N

Y N

Y N

Y N

Y N

Y N

Y N

Y N

Y N


23/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Forward Link

Coding /Spreading / Modulation

A multistage spreading scheme is used

Each subchannel is encoded/processed with a variety of schemes

Turbo coding

Interleaving / Bit repetition / Puncturing

Walsh covering

QPSK / 8-PSK / 16 QAM Modulation

Time domain multiplexing / gating

Gain controls A long code is NOT used on the Forward Link

Final spreading is done using a Hybrid PSK system

Simplified version of the cdma2000 Forward Link spreading system

Bandpass and phase compensation filters are applied to the final signal

These filters are IDENTICAL to the ones used for cdmaOne / cdma2000


24/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Forward Link

Subchannel Encoding / Spreading / Modulation

cos(2fct)

sin(2fct)

+

-

+

+

I Data

Q Data

Quadrature Spreading(Complex Multiply) AN RF Convertor

PNQ

Q-Channel PN Sequence @ 1.2288 Mcps

PNI

I-Channel PN Sequence @ 1.2288 Mcps

O

O

Q

I

Q

I

Q

I

Data

Preamble

MAC

Pilot

Q

I

Forwardsubchannels

Subchannel encoding

ToAntenna

Phase

Compensation

Bandpass

Filter

Q

I

Q

I

Q

I

TDM TDM


25/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Physical Layer

Reverse Link

Reverse Link Topics

Timing

Physical Structure

Operational Overview

Access Channel Overview

Channel Description

Coding

Structure

Reverse Traffic Channel Overview

Channel Description

Coding

Structure

Spreading

Modulation


26/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Reverse Link

Timing Structure

Source

All timing is derived from the received AN zero offset PN rollover

This provides a reference for the reverse frames

Forward link flight time is invisible

Hierarchy

Frames 26.67 ms duration

Slots

1.67 ms duration

16 Slots per frame

2048 PN chips per slot


27/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Reverse Link

Timing / Physical Structure

16 Slots

26.67 ms

1.67 ms

1 Slot (2048 chips)

...10(15) 1...

PN Sequence

Rollover

RevLinkFrames26.67 ms period

Slots1.67 ms period

Chips1.2288 MHz chip rate

813.8 ns chip period

Zero Offset PN

Sequence

RolloverFwdLinkFrames

26.67 ms period ...1 0(15)

1......1 0(15)

1...

One Way Delay (~3 us/km)(Invisible at Access Terminal)

...10(15) 1...


28/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Reverse Link

Operational Overview

Reverse Link Overview

Multiple subchannels implemented using CDMA and TDMA techniques

Two different operating modes

Access

Discontinuous transmission

Traffic

Continuous transmission

The AT PN rollover point is different than for the AT (15 chips later) AT: Midway between a string of 15 0 bits and a 1 bit

This is the same as in cdmaOne and cdma2000 on both forward andreverse links

AN: Midway between a 1 bit and a string of 15 0 bits


29/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Reverse Link

Channel Description Access

Access Channel Uses

Communications with the AN when an active session has not been set up Registration of the AT within the network

Requesting a session to be created

Implementation Consists of two subchannels (Pilot, Data)

Pilot is an all zero datastream (W160 encoded) on the I channel only

Data is a 9.6 kpbs datastream (W42 encoded) on the Q channel only

256 bit packets

Constant output power between preamble and data phases

Data subchannel power is scaled relative to pilot power

Pilot power is reduced by 6 dB during data phase

Similar operation to the access probe sequencing defined in IS-95/IS-2000

Minimum data transmission length is 16 slots

Governed by the message length of the Access Channel message

Minimum preamble transmission length is 16 slots

Governed by parameters specified by the network MAC layer


30/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Reverse Link

Access Channel Structure

Pilot Data

Q

I

t

16xnSlots

(nPhys

icalPacke

ts)

16xPre

amble

Length

(MAC

)Slots

P

P

9.6kb

psonly

6dB


31/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Reverse Link

Channel Description Traffic

Uses Used continuously during an active session

Implementation Consists of five subchannels (Pilot, Data, RRI, DRC, ACK)

Continuous transmission The Data subchannel is present only when there no data to send

The ACK subchannel is present only when receiving Forward data packets Minimum data transmission length is 16 slots

The encoded length of a reverse link physical packet is always 16 slots

Power control Pilot channel is directly power controlled via Forward MAC subchannel

Other channels are specified (via messaging) relative to the Pilot channel

Code division (from other ATs) is done via User long code masks The long code is reset to a specific value at every reverse link frame start


32/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Reverse Link

Channel Description Traffic

Subchannels Pilot

Used to train the AN receiver and assist in the recovery of reverse link data Pilot is an all zero datastream with a W160 cover on the I channel only

RRI The 3 bit reverse data rate is encoded and spread/repeated across 16 slots

Possible rates are: No data, 9.6, 19.2, 38.4, 76.8, and 153.6 Kbps

The first 1/8 of each slot of the Pilot channel is replaced with the RRI channel

RRI has a W160 cover and transmitted on the I channel only

ACK Used to acknowledge the successful reception of a forward traffic packet

May be used to early terminate a packet transmission

A single bit is spread/repeated across the first half of the slot

Nothing is transmitted in its place in the second half of the slot

Data is W84 covered on the I channel only

Transmitted only when the AT is receiving packets on the forward link


33/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Reverse Link

Channel Description Traffic (continued)

Subchannels (continued) DRC

Used to communicate two pieces of information to the AN Data rate control

Specifies the rate that the AT can receive for the current conditions

The 4 bit data rate is encoded as an 8 bit bi-orthogonal value

Serving AN point

Identifies which AN point is to deliver forward traffic to the AT

Encoded as 1 of 8 W8 covers of the data rate control value DRC is transmitted for an entire slot, but is shifted one half slot late

DRC has a final W168 cover and transmitted on the Q channel only

MAC Parameters

DRC Length (1 8) slots (sets the amount of time that an estimate is valid)

DRC Gating (This allows the AT to transmit the DRC data only once and it

remains in effect for DRCLength slots)


34/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Reverse Link

Channel Description Traffic (continued)

Subchannels (continued) Data

Data rates range from 9.6 to 153.6 kbps with packet sizes of 256 to 4096 bytes The encoded length of a reverse link physical packet is always 16 slots

Frame Offset specifies the offset from the start of the reverse link frame to thestart of the packet

Data has a W42 cover and transmitted on the Q channel only

Power level is set relative to the reverse pilot and per reverse rate setting


35/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Reverse Link

Reverse Traffic Channel Structure

Pilot

RRI

AC

K

DataDRC

Q

I

UnityGain

DRCGain

ACKGain

1/2Slo

t

1/2Slo

t

1/2Slo

t

t


36/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Reverse Link

Spreading / Modulation

A multistage spreading scheme is used

Each subchannel is encoded/processed with a variety of schemes

Turbo coding

Interleaving / Bit repetition / Puncturing

Walsh covering

Time domain multiplexing / gating

Gain controls

Separate I and Q long code masks are used Long code state is reloaded at every PN rollover with 0x24B91BFD3A8

Each subchannel is summed into the I or Q domain before the finalspreading operation

Final spreading is done using a Hybrid PSK system

Same as the cdma2000 Reverse Link spreading system Bandpass filters are applied to the final spread signal

These filters are IDENTICAL to the ones used for cdmaOne / cdma2000


37/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Reverse Link

Subchannel Encoding / Spreading / Modulation

cos(2fct)

sin(2fct)

+

-

+

+

I Data

Q Data

Quadrature Spreading

(Complex Multiply)Subchannel encoding

To

Antenna

Bandpass

Filter

Decimateby 2

Walsh Cover(++++=)

Q-Channel ShortPN Sequence

I-Channel ShortPN Sequence

Q-Channel

Access/User Long-CodePN Sequence

I-Channel

Access/User Long-CodePN Sequence

Pilot

ACK subchannel

DRC subchannel

Data subchannel

RRI subchannelTDM

AT RF Converter


38/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


1xEV-DO Measurements

Measurement Specifications

Minimum Performance Specifications for Access Networks (MPS_AN)

A set of tests for the access networks at all layers including the physical layer 3GPP2 C.S0032

TIA/EIA IS-864

Minimum Performance Specifications for Access Terminals (MPS_AT)

A set of tests for the access terminals at all layers including the physical layer

3GPP2 C.S0033 TIA/EIA IS-866

Test Application Specification Specification for AN and AT applications that run on the protocol stacks

Used to control the operation of the device for testing purposes

3GPP2 C.S0029-0

TIA/EIA/IS-890


39/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion



Physical Layer AT Tx

Section # Measurement Name Measurement Type

3.1.2.1.1 Frequency Coverage Design Time Check

3.1.2.1.2 Frequency Accuracy Waveform Quality

3.1.2.2.1 Time Reference Waveform Quality vs Time

3.1.2.2.2 Waveform Quality and Frequency Accuracy Waveform Quality

3.1.2.2.3 Redundant ACK Transmission CDP (Triggered)

3.1.2.3.1 Range of Open Loop Output Power Power (Triggered)

3.1.2.3.2 Time Response of Open Loop Power Control Power vs Time

3.1.2.3.3 Range of Closed Loop Power Control Power vs Time

3.1.2.3.4 Maximum RF Output Power Power

3.1.2.3.5 Minimum Controlled Output Power Power

3.1.2.3.6 Standby Output Power Power (Triggered)

3.1.2.3.7 RRI Channel Output Power CDP (Triggered)

3.1.2.3.8.1 Code Domain Power DRC Channel Output Power CDP (Triggered)

3.1.2.3.8.2 Code Domain Power ACK Channel Output Power CDP (Triggered)

3.1.2.3.8.3 Code Domain Power Data Channel Output Power CDP (Triggered)

3.1.2.4.1 Conducted Spurious Emissions Spectrum

3.1.2.4.2 Radiated Spurious Emissions Spectrum

3.1.2.4.3 Occupied Bandwidth Spectrum

Measurement descriptions from the 3GPP2 document C.S0033 (C00-20011015-109__AT-MPS_PPV.doc) 15-Oct-2001


40/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Section # Measurement Name Measurement Type

3.1.1.2.1 Demodulation of Forward Traffic Channel in AWGN PER

3.1.1.2.2 Demodulation of Forward Traffic Channel in Multipath Fading Channel PER

3.1.1.2.3 Decision of Power Control Bit for Channels belonging to Different Power Control Sets Power vs Time

3.1.1.2.4 Decision of Power Control Bit for Channels belonging to the Same Power Control Set Power vs Time

3.1.1.2.5 Demodulation of Reverse Power Control Channel during Soft Handoff Power vs Time

3.1.1.3.1 Receiver Sensitivity and Dynamic Range PER

3.1.1.3.2 Single Tone Desensitization PER

3.1.1.3.3 Intermodulation Spurious Response Attenuation PER

3.1.1.3.4 Adjacent Channel Selectivity PER

3.1.1.4.1 Conducted Spurious Emissions Spectrum

3.1.1.4.2 Radiated Spurious Emissions Spectrum


Physical Layer AT Rx

Measurement descriptions from the 3GPP2 document C.S0033 (C00-20011015-109__AT-MPS_PPV.doc) 15-Oct-2001


41/41

Introduction

What is 1xEV-DO?

Protocol Stack

Channel Overview

Physical Layer

Forward Link

Physical Layer

Reverse Link

Measurement

Overview

Conclusion


Summary

Technical overview of 1xEV-DO

Detailed examination of channel operation

Forward link overview

Reverse link overview

Brief overview of the measurements defined for 1xEV-DO

Date post:	06-Apr-2018
Category:	Documents
Upload:	tao-wang
View:	220 times
Download:	0 times

1xEV DO Technical Overview

Documents