Rg008607 Cdma2000 1xev-Do Principle

7/30/2019 Rg008607 Cdma2000 1xev-Do Principle

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08.May. 2006

HUAWEI TECHNOLOGIES Co., Ltd.

www.huawei.com

HUAWEI Confidential

Security Level: Internal

RG008607 CDMA2000 1xEV-DO

Principle



Chapter 1 Overview

Chapter 2 Air Interface

Chapter 3 Key Technology

Chapter 4 REVA Introduction

Contents



HUAWEI Technologies Co., Ltd. Page *

Qualcomm gives up the development of the EV-DV chip, which improves thecommercialization of the EV-DO Rev.A.

The American CDMA carrier Sprint prefers the EV-DO to the EV-DV.

Most CDMA vendors cancel the development plan of the EV-DV.

1X: single 1.25MHz carrier

DO: Data Optimized

DV: Data & Voice

HRPD: High Rate Packet Data

1xEV-DO

DO Rev.ADO Rel.0 Enhancement

HRPD phaseI phaseII

CDMA2000 1XcdmaOne

IS95A IS95B IS2000 Rel.0 Rel.BRel.A Rel.C

1x EV-DV

Rel.D

The EVDO system is designed for the non-real-time, anisomerous and high-speed packet data

service.

FDMA (AMPS, Analog)

TDMA (incl. GSM)

CDMA

CDMA Evolution


http://slidepdf.com/reader/full/rg008607-cdma2000-1xev-do-principle 4/51HUAWEI Technologies Co., Ltd. Page *

CDMA 1x EV-DO Network Structure

Packet Control Function (PCF)

AN-Authentication, Authorization and Accounting (AN-AAA)



Contents

Chapter 1 Overview


2.1 Overview

2.2 Forward Link

2.3 Reverse Link





Stream

layer

Application

layer

Connection

layer

Session

layer

Security

layer

MAC

layer

Physical

layer

Functions:

• Application layer: For application of the air link

data and signaling

• Stream layer: For the QOS identification of the data

and signaling stream at the application layer

• Session layer: Establishes, maintains and releasesthe session between air interfaces

• Link layer: For obtaining, connecting and releasing

the system

• security layer: Encrypts the air interface

• MAC layer: Controls the access to the physical

channel• Physical layer: Specifies the structure of the

reverse physical channel

EV-DO Protocol stack



Communications Modes Between EV-DO Air Interfaces

Stream

layer

Applicationlayer

Connection

layer

Session

layer

Security

layer

MAC

layer

Physical

layer

AT AN

Layer X

Layer Y

Protocol A

Public Data

Protocol A

Protocol B Protocol B

Headers

Messages

Headers

Messages

Commands Indications Commands Indications

Public Data

Public Data Public Data

Communication Mode Between EV-DO Air Interfaces



Time

Link 1

Time

EV-DO Session

Link 2 Link 3 Link 4

PDU1 PDU2 PDU3

Time

Session dormancy

Forward and reverse

link channelassignment

Authentication and

MAC-Index

assignment

Assignment of UATI

PDU: Packet Data Unit

Data Transmission

Modes for Transferring Information at Air

Interface

UATI: Unicast Access Terminal Identifier



Contents

Chapter 1 Overview


2.1 Overview

2.2 Forward Link

2.3 Reverse Link



Cl ifi ti f F d Ch l & Sl t St t f F d Li k




Forward Channel

PilotMedium

Access

Control

Control

Reverse

ActivityDRC

Lock

ReversePower

Control

The RA channel

and the RPC/DRC

Lock are in thecode division

multiplexing

mode.

Traffic

Classification of Forward Channels & Slot Structure of Forward Links

Time

division

The link

transmission is in

slots.A slot is 5/3

milliseconds.

A slot consists of

2048 chips.

The forward time

division is main and the

code division is

auxiliary.




Data

400 chips

RPC/DRC Lock

RAB RPC/DRC Lock

RAB

Active Slot

64

RPC/DRC Lock

RAB

Pilot

96 64

RPC/DRC Lock

RAB

Data

400 chips

Data

400 chips64

Pilot

96

chips

64Data

400 chipschips

1024 chips = half slot 1024 chips = half slot

System time

1 Slot

8 Slots

1 slot = 1.667 ms

1/2 frame = 13.33 ms

Frame = 26.67 ms

16 Slots

50 2 31 54 6 75 512 14 151358 10 119

4 Slots

2 Slots

4 slot = 6.66 ms

2 slot = 3.33 ms

Idle Slot 64

RPC/DRC Lock

RAB

Pilot

96 64

RPC/DRC Lock

RAB

chips

64

RPC/DRC Lock

RAB

Pilot

96 64

RPC/DRC Lock

RAB

chips

Forward Link Frame/Slot Structure




MAC-Index Allocation

MAC-Index Used Channel

0-1 －

2 Control channel (76.8kbps)

3 Control channel (38.4kbps)

4 MAC channel (RA)

5－63Traffic channel or MAC channel

(RPC/DRC Lock)

•The Control Channel is mainly used for the

transmission of broadcast message or message to some

specific terminal(s). It shares a physical channel

with the traffic channel in time division mode.

The terminal judges the channel according to theMACIndex in the channel preamble.

Identification of Forward Channel

An MACIndex maps a Walsh

code of 64 order and a Walsh

code of 32 order that

respectively indicates the

MAC channel and traffic

channel/control channel.




Pilot Channel

Control Channel

Traffic Channel

Data400chips

MAC64chips

MAC64chips

Data400chips

Data400chips

MAC64chips

MAC64chips

Data400chips

RA

DRC LockRPC

Data400chips

MAC64chips

MAC64chips

Data400chips

Data400chips

MAC64chips

MAC64chips

Data400chips

Data400chips

MAC64chips

MAC64chips

Data400chips

Data400chips

MAC64chips

MAC64chips

Data400chips

Bit stream

Data stream

All 0 Bit

AP

Pilot96chips

Pilot96chips

Pilot96chips

Pilot96chips

Pilot96chips

Data Data Data

MAC MAC MAC MAC

Pilot Pilot Pilot

Pilot96chips

Forward Physical Channel




The Pilot Channel information is a bit stream of all 0s, modulated by

.•Different from the continuous pilot in the 95/1x system, the 1xEV-DO system uses the burst pilot.

•The Burst Pilot transmits in the most power. According to the simulation, its performance is as

good as the continuous pilot of 1X. It is very difficult to lock the non-continuous pilot, so the

protocol specifies that the period from accessing the terminal to obtaining the pilot is 60

seconds increased from 15 seconds.

•The pilot channel helps the system to obtain, demodulate and test the link.

Power

TimeSlot 1 Slot 2

Pilot Bursts

Pilot Channel

64

0w

AC C




•The MAC channel consists of the RA, DRC Lock and RPC channels. The RPC and DRClock use TDM and the RPC and RA

are separated by code division multiplexing.

•The rate of the RPC is 600 × (1-1/DRCLockPeriod).The RPC channel re-sends (DRCLockPeriod-1) times every

DRCLockPeriod slots.

•The DRClock re-sends DRCLockLength times every DRCLockPeriod slots.

•The rate of the RA channel is (600/RABLength) bps. It sends a updated reverse activity bit RAB every RABLength slots.

•The RA and the RPC/DRCLock use TDM. The Walsh2 spreading code of 64 order is always used. The mapping MACIndex

is 4.

•The code word used by the RPC/DRCLock channel can be selected from MACIndex=5-63.

RA

DRC Lock for user1

RPC for user1

RPC & RA

Repetition Cycle 8 times Repetition Cycle 8 times

DRC LockPeriod 8 slots

DRC Lock for user n

RPC for user n

… RA

DRC Lock for user1

RPC for user1

DRC Lock & RA

DRC Lock for user n

RPC for user n

…

MAC-Index＝4

DRC LockPeriod

DRC LockLength

RAB Length

MAC Channel

T ffi Ch l




•For the transmission in the first slot, a preamble is required to be included.

• The preamble is the result of repeated Walsh code of 32 order.

•The preamble information helps to distinguish different users. It is represented

by MAC index.

Data272 chips

MAC64chips

MAC64chips

Data400chips

Pilot96chips

Data400chips

MAC64chips

MAC64chips

Data400chips

Pilot96chips

Preamble

128 chips

Data400chips

MAC64chips

MAC64chips

Data400chips

Pilot96chips

Data400chips

MAC64chips

MAC64chips

Data400chips

Pilot96chips

Data400chips

MAC64chips

MAC64chips

Data400chips

Pilot96chips

Data400chips

MAC64chips

MAC64chips

Pilot96chips

First

slot

Data400chips

Walsh Chip

Level

Summer

128 preamble chips

6272 data chips divided into 4 TS

（1600×4－128＝6272）

Scrambling InterleavingModulation

QPSK/8PSK/

16QAM

16-aryWalsh

Covers

SequenceRepetition,

Signal

Puncturing

SymbolDEMUX

1 to 16

Data packet:2048bits

WalshChannel

gain

ChannelCoding

1/3 or 1/5

Interval

slot

Final

slot

Traffic Channel

Sl t M lti l i M d f F d T ffi




SM1

Data336chips

Pilot&MAC224chips

Preamble64chips

Data800chips

Pilot&MAC224chips

Data400chips

1536 Data Modulation Symbols

SM2

Data336chips

Pilot&MAC224chips

Preamble64chips

Data800chips

Pilot&MAC224chips

Data400chips


Data400chips

Pilot&MAC224chips

Single-slot transmission

Slot Multiplexing Mode of Forward Traffic

Channel at Physical Layer

Slot Multiplexing Mode of Forward Traffic Channel at Physical Layer




SM3

Data400-N chips

Pilot&MAC224chips

PreambleN chips

Data800chips

Pilot&MAC224chips

Data400chips

2560 or 3720 Data Modulation Symbols

Data400chips

Pilot&MAC224chips

2-4 Slots Multi-slot transmission, preamble less than 400chips

SM4

Pilot&MAC224chips

Data668chips for 8 slots

176chips for 16 slots

Pilot&MAC224chips

Data400chips


Preamble400chips

Preamble112chips for 8 slots

624chips for 16 slots

Data400chips

Data400chips

Pilot&MAC224chips

2-4 Slots Multi-slot transmission, preamble more than 400chips

Slot Multiplexing Mode of Forward Traffic Channel at Physical Layer

Example of Link Adaptation




CodeRate

ModulationType

SlotsEncoder Packet

Duration (ms)Bits per Encoder

PacketData Rates

(kbps)

1/5 QPSK 16 26.67 1024 38.4

Slot Multiplexing

Mode

SM4

Data rate＝1024/(16×1.67)=38.4kbpsProvided modulation characters＝1024×5/2=2560

Needed modulation characters＝16×1600－1024＝24576

Repeated factors＝24576÷2560＝9.6

During the transmission, the TDM mode is SM4. In the first slot, 1024 chips are used

for the preamble. The rest 576 chips are used to transmit 576 modulation characters.

If the terminal is demodulated correctly, the system will stop transmitting the

subsequent modulation characters. Then, the actual code rate is 1024/576=1.78.

Taking 38.4 kbps as an example

SM4

Pilot&MAC224chips

Data176chips for 16 slots

Pilot&MAC224chips

Data400chips


Preamble400chips

Preamble624chips for 16 slots

Data400chips

Data400chips

Pilot&MAC224chips

2-4 Slots多时隙传送，前缀大于400chips

Example of Link Adaptation

Control Channel




The traffic channel and the control channel are

separated by TDM.

The traffic channel transmits the user data and thecontrol channel transmits the signaling and system

messages.

The messages transmitted through the control

channel are sent by capsules. The rate can be 38.4

kbps or 76.8 kbps.

Control Channel

Traffic ChannelData stream

Control Channel

Traffic ChannelTraffic Data

Control Channel

Traffic ChannelControl Data

Control Channel Cycle

(256 slots = 426.66 ... ms)

Control Channel Cycle

(256 slots = 426.66 ... ms)

SC SCAC

SC: Synchronous Control Channel capsule.

AC: Asynchronous Control Channel capsule.

Offset Offset

The packet capsule consists of: SC: Its transmission cycle is 256 slots, 16 frames.

The SC contains the following information:

Synchronization message: CDMA system time, Sector

PNOffset

Quick configuration message: SectorID, ColorCode,

Sector & Access Signature

Sector parameter message: Position, Time, Neighbor List,

Subnet mask

Paging message

AC: Multiple ACs can be contained in an AC cycle.

The AC contains the following information:

Other messages: ACK message, RLP control message

The structure and the assembly method of

the control channel are the same as those

of the traffic channel.

Control Channel

Ch t i ti f F d Li k




Mode of TDMA

Constant forward power without power control Variable rate

2,456,1,843,1,228,922.1,614.4,307.2,153.6,76.8 and 38.4kbps To send a Packet, 1-16 slots are needed. A slot is 1.667 ms.

After receiving the contents during each slot, the AT sends the ACK/NACK

message in the reverse ACK channel.

Variable rate control

The AT measures the RF signal all the time and determines the maximum

rate that can be supported according to the measurement. The AT sends therate application by Slot through the DRC channel.

Algorithm of dynamic scheduling

The network side will receive all the rate applications sent by the AT.

The Scheduler determines the allocation of each Slot for the AT.

Now, the common algorithm is Proportional Fair.

Maximization of Throughput of Single Sector During a period, the time or Slot allocated to each AT is the same on average.

The AT who applies for higher rate will get higher Throughput.

Selection of quick service sector

The forward data is transferred in a sector only.

Characteristics of Forward Link



Contents

Chapter 1 Overview


2.1 Overview

2.2 Forward Link

2.3 Reverse Link



Division of Reverse Channel




Reverse

Traffic Access

Reverse

Rate

Indicator

Data

Rate

Control

Pilot DataPilotMedium

Access

Control

Data ACK

Division of Reverse Channel

Use the coherent demodulation

The power control is similar to that of CDMA2000 1x.

The soft handoff is similar to that of CDMA2000 1x.

Rate set of reverse link in 1xEVDO Rel.0:

9.6, 19.2, 38.4, 76.8, 153.6 kbps

The maximum transmission rate is limited by the sector load.

The Pilot channel and

the RRI channel are

separated by time

division multiplexing.

The reverse code division is main and

the time division is auxiliary.

Reverse Access Channel




Pilot

Access DataPilot

Pilot-I

Access Data-Q

Access

Probe

16

0w

Reverse Access Channel

4

2w

Preamble Frames Capsule Frames

The access probe consists of access channel preamble and multiple data packets in the access

channel. In the preamble, only the pilot channel is transmitted. In the data, the pilot channel and data

channel are transmitted at the same time. When the preamble is sent, the pilot power is more than that

when the data is transferred.

probe

probe

sequence

tp

1 2 3 Np

1

persistence

ts

tp

1 2 3 Np

2

persistence

tp

1 2 3 Np

N s

persistence

Time

...

...

Ns: The probe number is 1-15. The default number is 3.

Np: The number of probes that a probe set contains is 1-15.

The default number is 15.

Reverse Traffic Channel




DRC

ACK

Traffic

16

0w

16

8w

8

4w

4

2w

1.67 ms

1.67 ms1/2 Slot

1.67 ms

RRI

Pilot

RRI

PilotPilot

RRI

PilotRRI

1 Slot = 2048 Chips: 256 chips for

RRI /1792 chips for Pilot (7:1)

1 frame 16 Slots = 26.67 ms

1.67 ms

1.67 ms

Reverse Traffic Channel

The forward channel transfers the information in slots.

The reverse channel transfers the information in frames (26.67 ms).

Pilot/RRI16

0w

1.67 ms

Reverse Traffic Channel-DRC Channel




The DRC channel is used to bear the identification of the station that communicates with this terminal

and rate request information of the station.

The transmission rate of the DRC is600/DRCLength. The terminal can sends

the same DRC information DRCLength

times in a slot. Also, the information can be

sent in the threshold mode, namely, sent

once every DRCLength slots.

DRCLength=8

DRCLength=4

DRCLength=2

DRCLength=1

DRC

Channel

Forward service

channel

The DRC sub-channel contains the information

about DRC value and DRC cover.

The DRC value consists of the information about

the rate to be applied.

The DRC cover consists of the information about

the service sector pilot to be applied.

Demodulation Parameters in Reverse Channel




Demodulation Parameters in Reverse Channel

Parameter

Demodulation Parameters in Reverse ChannelData rate (kbps)

9.6 19.2 38.4 76.8 153.6

Data packet length 256 512 1024 2048 4096

Frame length 26.67 26.67 26.67 26.67 26.67

Coding rate 1/4 1/4 1/4 1/4 1/2

Character length 1024 2048 4096 8192 8192

Character rate 38.4 76.8 153.6 307.2 307.2

Number of

repeated serial

numbers 8 4 2 1 1

Demodulation rate 307.2 307.2 307.2 307.2 307.2

Demodulation

mode BPSK BPSK BPSK BPSK BPSK

Spreading code

length 128 64 32 16 8

Characteristics of Reverse Link




Similar to 1X

Reverse power control

Reverse PilotVariable rate

153.6, 76.8, 38.4, 19.2, 9.6 kbpsThe packet is transferred in frames. To send a Packet, 16 slots are needed. A slot is 1.667

ms.

•The reverse transfer rate is decided and at the same time the transfer rate is

described in the RRI channel.

The data can be transferred reversely only when the DATA Queue is not null.The data is sent in the minimum rate at which all the data in the data queue can

be transferred.

Generally, the transfer rate starts from 9.6 kbps and is increased according to a

certain probability.

• At the network side, there is the mechanism to control the reverse rate.

The reverse rate is changed quickly through the forward RAB channel.

• Handoff Active, Candidate, Neighbor and Remaining Sets

Pilot search

Handoff thresholds

C a acte st cs o eve se



Contents

Chapter 1 Overview




1. Time Division Multiplexing




p g

Different forward channels share each slot by

time. Each kind of channel transmits in full power.

Different users share the slot resource of

the system. In each slot, the system serves

the specified user.

2. Multi-User Scheduling




C/I

C/I C/I

307k 38k

614k 307k1.2M 2.4M 614k 38k

Time

Power

2. Multi-User Scheduling




The slot resource is the most valuable resource in the EVDO forward link.

In each slot, making sure that the fairness to multiple users, select the user

with the link of the best quality to serve.

Round Robin Scheduler

Maximum Signal-Interference Ratio Scheduler

Propor t ional Fairness Scheduler

Pk ＝ DRCk/Tk

3.Hybrid Automatic Retransmission (HARQ)




n n+1 n+2 n+3 n+4 n+5 n+6 n+7 n+8 n+9 n+10 n+11 n+12 n+13 n+14 n+15

One half

slot

offset

1st Slot 2ndSlot 3thSlot 4thSlot

3 Slots delay NAK

R-DRC

Channel

F-Traffic

Channel

R-ACK

Channel

Decode Failed

3 Slots delay NAK

Decode Failed

3 Slots delay NAK

Decode Failed

3 Slots delay ACK

Decode

Successful

DRC value

requests 153.6

kbps

Normal receiving

3 Slots delay NAK

R-ACK

Channel

Decode Failed

3 Slots delay NAK

Decode Failed

3 Slots delay ACK

Terminate in advance

4. Rate Control-Forward




In the EVDO system, the AN does not specify the

rate for the AT. The forward rate is decided by the

AT itself.The AT evaluates the C/I of the forward channel to

check the expected data rate and to gather the

sectors whose channel quality is the best. The two

messages are reported to the AN through the DRC

channel. The AN dynamically adjust the service

sector mapping this AT and the forward

transmission rate according to the messages.

• Pilot SINR evaluation: In each slot, the station delivers 96*2

bits of forward pilot signal. The terminal calculates the SINR

(C/I) of the forward pilot.

• Channel evaluation: According to the signal noise ratio of

the forward pilot in the past period, evaluate the signal noise

ratio of the forward pilot in the next slot.

• According to the signal noise ratio threshold that is set or adapted, query from the table to get the maximum

transmission rate that can be supported by the forward link

in the next slot.

• The AT reports the values of DRC Value and DRC Cover to

the AN through the DRC channel. The value of DRC Cover

determines the sector that serves the AT. The AN learns the

expected receiving rate from the DRC Value.

4.Rate Control-Reverse




Not

Busy

9.6

kbps

19.2

kbps

153.6

kbps

P1

38.4

kbps

76.8

kbps

P2 P3 P4

Busy9.6

kbps

19.2

kbps

153.6

kbps

q1

38.4

kbps

76.8

kbps

q2 q3 q4

The rate control and sectors in the active set of the

EVDO reverse traffic channel

1: Load (CombinedBusyBit)

2: Current rate (CurrentRate)

3: Rate transition probability

4: Terminal buffer data amount

5: Minimum load requirement

6: Minimum load restriction

7: Maximum rate (MaxRate)

8: Current rate limit (CurrentRateLimit)

9: Algorithm of the rate control of the reverse link

If RAB = 1 (Busy), the transmission rate

is decreased at the probability q.

If RAB = 0 (Not Busy), the transmission rate

is increased at the probability p.

The evaluation precision of the reverse load

directly affects the correctness of the rate

control of the reverse channel. The MAC

algorithm of the EVDO reverse traffic

channel judges the load size of the reverse

channel through ROT and controls the

allocation of the reverse link resources

through the ROT.

ReverseLinkSilencePeriod

ReverseLinkSilenceDuration

Virtual Soft Handoff




BSC

Data

Cell A Cell B

DRC (A)

Data

DRC (A)

Before

BSC

Data

Cell A Cell B

DRC (B) DRC (B)

Handoff

BSC

Data

Cell A Cell B

DRC (B) DRC (B)

After

Data

APA

APB

DRC DRC

AP1 AP2

Time

Serving AP

t1

ServingAP change

1xEV-DO Handoff Classification




YDormant handoff inside PDSN

N

N

Y

Y

Revers

e

Virtual soft

handoff Soft handoff inside BSC

NSoft handoff between BSCs

NHard handoff

Y

Dormant handoff between

ANs (by default, all ANs

covered by a PCF)

Virtual softer

handoff Softer handoff

Forward

Support

Handoff Type

Handoff in 1xEV-DO

Network

Handoff between 1x and 1xEV-DO,

dominated by terminal

Y

Y (Complete indirectly)

N

Handoff of EVDO to active 1X

Handoff of 1X to active EVDO

Dormant handoff

Support

Handoff Type



Contents

Chapter 1 Overview




EVDO(Release 0)Design Idea




• It is designed for the non-real-real time, unsymmetrical and

high-speed packet data service.

• Its design objective is to separate the high-speed packet

data from the low-speed voice and data services.

• Its design focus is on the forward link.

EVDO Release 0 Constraints and Rev A Improvement




Release 0 Constraints

The reverse throughput is insufficient for developing multiple applications.

The reverse rate and capacity is relatively undersized, which restricts the

development of the symmetry data service.

The support for the QoS cannot meet the demands of the real-time service.

The interoperation between the Release 0 and the CDMA2000 1x is to be improved.

Rev A ImprovementSpectral efficiency: Supports multi-user group and smaller group to realize more flexible service adaptation.

System Capacity: Enhances the bandwidth and transmission rate of the reverse link; improves the throughput of

the forward link; supports the symmetry bandwidth multimedia service; meets the demand on the system capacity for

the packet service development.

QoS requirement: Supports end-to-end QoS service. The optimized QoS guarantee mechanism is established on

every protocol layer of the air interface, which shortens the service delay.

Service coverage: Controlling the AT more precisely to realize the seamless coverage for the service.

Network handoff: Supports the EVDO system to deliver the CDMA2000 1x paging message to save the system

resource and terminal power consumption. Then the perfect handoff is realized between two networks.

Supporting Multi-User Package




The packages of the services such as PTT/VOIP that the Rev A supports is small.

Combining the small packages of multiple users can enhance the utilization of the

air interface and increase the system capacity.

user2 user3 user4user1header trailer MAC layer

Packages at

security layer user2 user3 user4user1

The transmission of the DO RA reverse link is in sub-frames. Compared with

the transmission of the DO RO in frames, the minimum transmission period

changes from 40 ms (26.67 ms + 13.33 ms) to 10 ms (6.67 ms + 3.33 ms). 26.67

ms indicates the frame length, 6.67 ms for sub-frame length, 13.33 and 3.33

for the average waiting period. In this case, the good support is provided

for the real-time services such as VOIP.

Extension of MAC Index




MAC Index Usage of MAC Channel Preamble Usage Preamble

Length

0 and 1 Not Used Not Used N/A

2 Not Used 76.8k Control Channel 512

3 Not Used 38.4k Control Channel 1024

4 RA Not Used N/A

5 Not Used Broadcast Variable

64&65 Not Used Not Used N/A

66 Not Used Multi-user packet(128/256/512/1024, 4,

256)

256

67 Not Used Multi-user packet(2048, 4, 128) 128




71 Not Used 19.2/38.4/76.8-kbps Control

Channel(128/256/512, 4, 1024)

1024

6-63, 72-127 RPC/DRCLock/ARQ Single-user package Up toDRC

Extension of Reverse Rate Set




The peak rate of the forward link increases from 2.4576 Mbps to 3.072 Mbps.

The peak rate of the reverse link increases from 153.6 kbps to 1.843 Mbps.

Changing the Physical Channel

CDMA 1X




Forward

CDMA 1X

EV-DO RTT

Rev.A

Reverse

PilotMedium

Access

Control

Traffic Control TrafficAccess

Reverse

Rate

Indicator

Data

Rate

Control

Reverse

Activity

DRC

Lock Pilot Data

Reverse

Power

Control

Auxiliary

Pilot

Medium

Access

Control

Data ACKARQ Primary

Pilot

Data

Source

Control

No Change

Change

New

F-ARQ: Separated from the RPC and DRCLock by time division multiplexing to complete the

reverse HARQ function.

Reverse auxiliary pilot: Provides the coherent demodulation standard for the reverse transmission of the

long data packet.

DSC: Realizes the continuous data transmission in the case of the handoff and shortens the delay of

the virtual soft handoff.

Reverse Hybrid ARQ




Reverse H-ARQ: 16-slot frame is divided into four sub-frames. Each four slots are

used to send a sub-frame. 12 slots are used to send the sub-frames in interleaving

way. The reverse termination in advance is supported so that the reverse capacity

is increased.

ARQ and

RPC/DRCLock are

separated by timedivision

multiplexing.

DSC Virtual Soft Handoff Package




DSC auxiliary virtual soft handoff: The DSC notifies the AN in advance that the

target cell of this handoff to shorten the handoff delay.

Improving EVDO Rev A System




1xEV-DO Rel.0 1xEV-DO Rev.A

Multiple access mode Forward code division + time

division H-ARQ;

Reverse code division

Forward code division + time

division H-ARQ;

Reverse code division + H-ARQ

Service Supports packet data service only Supports packet data service and

real-time service

Maximum

forward/reverse rate

(bps)

2.4576Mbps/153.6Kbps 3.072Mbps/1.8432Mbps

Cell throughput (bps) Forward 1.2Mbps(double-antenna

terminal) /650kbps(single-antenna

terminal),

Reverse 350kbps

Forward 1.5Mbps(double-antenna

terminal)

Reverse 1.2Mbps(4-branch

diversity)

Chip rate/1.25M 1.2288Mcps 1.2288Mcps

Coding mode Turbo Turbo

Demodulation mode Forward QPSK/8-PSK/

16-QAM

Reverse BPSK

Forward QPSK/8-PSK/16-QAM

Reverse BPSK/QPSK/8-PSK

Frame length 26.667ms 26.667ms

Sub-frame 6.67ms

Improving EVDO Rev A System




Increase system capacity

Shorten service delay

Improve interoperation with 1x

Realize end-to-end QoS

Extend forward/reverse rate set

Extend MACindex

Support multi-user package

Reverse Hybrid ARQ

Increase capacityImprove key performance

08.May. 2006 Security Level: Internal



HUAWEI TECHNOLOGIES Co., Ltd.

www.huawei.com

HUAWEI Confidential

Thank You

www.huawei.com

Abbreviations

）




EVDO 1x Evolution -Data only（Optimization ）

HDR High Data Rate

HRPD High Rate Packet Data

AN Access Network

PDSN Packet Data serving NodePCF Packet Control Function

FA Foreign Agent

HA Home Agent

AAA Authentication, Authorization, Accounting Server

RC Radio Configuration

SR Spreading Rate

RS Rate Set

ACK AcknowledgementHARQ Hybrid Automatic ReQuest

DSC Data Source Control

DRC Data Rate Control

MAC Medium Access Control

RAB Reverse Activity Bit

RPC Reverse Power Control

RRI Reverse Rate Indicate

SM Slot MultiplicityT2P Traffic to Pilot

ROT Rise of Thermal

PER Packet Error Rate

FEC Front Error Control

BPSK Binary Phase Shift keying

Review*Question




1. What are the reverse rates of DO RO and DO RA?

2. What are the forward channels of DO RO?

3. What is the use of channels of DRC and DRCLock?

4. What are the updates of the DO RA, compared with the DO RO?

5. What are the differences between the DO RO handoff and 1X in the forward

link?

6. What is the virtual soft handoff?7. What is the interface between the BSC and the AN-AAA?

8. Are the forward RA channel and the PRC/DRC Lock are separated by time

division or code division?

9. How many chips does one slot contain in the EVDO forward link?

10. What are the two rate levels that the control channel of DO RO contains?11. What are the common multi-user scheduling rules?

12. What is the difference between the forward pilot of EVDO and 1X?

Documents

Rg008607 Cdma2000 1xev-Do Principle