Cdma2000 1x Principle Issue5[2].0

7/29/2019 Cdma2000 1x Principle Issue5[2].0

1/85

Huawei Confidential. All Rights Reserved

CDMA2000 1x Principle

ISSUE 5.0


2/85

Internal Use1

Objectives

Upon completion this course, you will be able to:

Describe the development of mobile system

List the structure of CDMA2000 1X network State the principle of CDMA2000 1X

State the key technology of CDMA2000 1X

Describe the air interface of CDMA2000 1X

Describe the numbers in CDMA2000 1X


3/85

Internal Use2

Chapter 1 Introduction

Chapter 2 Principle of Spreading

Chapter 3 Technology of CDMA2000

Chapter 4 Physical Layer of CDMA2000

Chapter 5 Number Planning


4/85

Internal Use3


1.1 Development of Mobile Communications

1.2 Development of CDMA System

1.3 CDMA 2000 Network Structure


5/85

Internal Use4

Transmission Techniques

Power

Power

Power

CDMA

TDMA

FDMA

Traffic channels:different users are

assigned unique code and transmitted

over the same frequency band, forexample, WCDMA and CDMA2000

Traffic channels: different time slots are

allocated to different users, for example,GSM and DAMPS

Traffic channels: different

frequency bands are allocated to

different users, for example,

AMPS and TACS


6/85

Internal Use5

Development of Mobile Communications

3G provides:

Complete integrated service solutions High bandwidth

Unified air interface

Best spectral efficiency.

Analog to Digital Voice to Broadband

AMPS

TACS

NMT

Others

1st Generation

1980s (analog)

GSM

CDMA

IS95

TDMAIS-136

PDC

2nd Generation

1990s (digital)

UMTS

WCDMA

CDMA

2000

TD-

SCDMA

3rd Generation

current (digital)


7/85Internal Use6

Difference of 3G Standards

3G system

CDMA2000

3GPP2

FDD mode

WCDMA

3GPP

FDD mode

TD-SCDMA

CWTS

TDD mode


8/85Internal Use7


1.1 Development of Mobile Communications




9/85Internal Use8

Development of CDMA System

Higher spectrum efficiency and network capacity Higher packet data rate and more diversified services

Smooth transit to 3G

IS95A

9.6kbps

CDMA2000 1x

307.2kbps

Heavier voice

service capacity

Longer period of

standby time

CDMA2000

3x

CDMA2000

1x EV

1x EV-DO

1x EV-DV

1995

IS95B

115.2kbps

1998

20002003


10/85Internal Use9


1.1 Development of Mobile Communicatins




11/85

Internal Use10

CDMA 2000 Network Structure


12/85


13/85

Internal Use12







14/85

Internal Use13


2.1 Basic Conception

2.2 Communication Model


15/85

Internal Use14

Direct Spread (DS)

Direct

Sequence Spread spectrum system mixes the input datawith a fast sequence and transmits a wideband signal.

The spreading sequence is independently regenerated at the

receiver and mixed with the incoming wideband signal to recover

the original information.

Transmission Receiving

Fast spreading sequence

Slow InformationSent

Slow informationRecovered

Wideband signal

Fast spreading sequence


16/85

Internal Use15

Direct Spread (DS)

Spread sequence

Spread signal

Recover signal

Information signal bit

Spread sequence

Spread & De-spread


17/85

Internal Use16

Spectrum-domain Analysis

Spread

Power spectrum of

information signal(narrowband)

P()

Power spectrum of

spread signal(broadband)

Mixed signals power

spectrum(broad band

and broad band)

P()

P()

P()

P()

P()integral/filtering

Recover signals

power spectrum(narrow band)

Mixed signals power

spectrum(broad band

and narrow band)

Add

De-spread


18/85

Internal Use17

Correlation

(a)

(b)

Correlation 100% so the

functions are parallel

Correlation 0% so the

functions are orthogonal


19/85

Internal Use18

Sequence 2#

Output of

integral

circuit

Sequence 1#

1#2#

Orthogonal Function


20/85

Internal Use19

Multiple Access

Code Division Multiple Address Principle

Information bit 1#

Sequence 1#

Spread Signal 1#

Mixed Signal 1+2

Information bit 2#

Sequence 2#

Spread Signal 2#


21/85

Internal Use20

Multiple Access

1st receiver resume process

Spread Sequence 1#

De-spread Signal

Mixed Signal

Output of

Judgement

circuit


22/85

Internal Use21

Multiple Access

2st receiver resume process

Spread Sequence 2#

De-spread Signal

Mixed Signal

Output of

Judgement

circuit


23/85

Internal Use22

Chapter 2 Princple of Spreading

2.1 Basic Conception

2.2 Communication Model


24/85


25/85

Internal Use24

Source Coding

There are 3 types of source coding in CDMA 2000 system:

8K QCELP

13K QCELP

EVRC

Characteristic:

Support voice activity


26/85

Internal Use25

Channel Coding

Convolution code or TURBO code is used in channel encoding

Encoding efficiency= (total input bits total output symbols)

Register

MUX

00001011

Bit

00110001

00100111

0000110100101011

Symbol

Channel Coding: Convolution


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Internal Use26

Channel Coding

1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 81 2 3 4 5 6 7 8

8 8 8 8 8 8 8 8 1 1 1 1 1 1 1 1

1 2 3 4 5 6 7 8

2 2 2 2 2 2 2 23 3 3 3 3 3 3 3

Input:

Output:

Transmission direction

Interleaver

Transmission direction

Write by row

Read by column

Channel Coding: Interleaving


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Internal Use27

Channel Coding

1 0 1 1

1 0 1 1 1 1 1 0 1 1 1 0

Without channel coding, receiver cant correct any errors1 0 1 1

1 1 1 0 0 0 1 1 1 1 1 1

1 0 1 1

1 1 1 0 0 0 1 1 1 1 1 1

1 1 1 0 1 0 1 1 0 1 1 1

1 0 1 1

1 1 1 0 1 1 0 0 1 1 1 1

1 1 0 1

1 0 1 1

1 1 10

After convolution, receiver can correct errors.

But recovery capability is restricted by encoding complexity.

1 0 1 1

1 1 1 0 0 0 1 1 1 1 1 1

1 11

1 10 00

1

1 11

1 0 1 1 1 0 1 1 1 0 1 1

1 0 1 1 0 1 0 0 1 0 1 1

0 11

0 1

1 00

1

0 11

1 0 1 0 1 0 1 0 1 1 0 1 1 0 1 1

Source

Through the interleaving, the consecutive error codes can be corrected


29/85

Internal Use28

Scrambling and Spreading

M Sequence for scrambling

Long Code Short Code

Walsh Code for spreading


30/85

Internal Use29


Two points are important here:

Maximum number of shift register (N)

Mask

The period of out put sequence is 2N-1 bits

Only sequence offset is change when the mask is changed

PN stands for Pseudorandom Noise sequence

Out

0 0 1

1 1 0

M Sequence


31/85

Internal Use30


The long code is a PN sequence with period of 242

-1chips

The functions of a long code:

Scramble the forward CDMA channel

Control the insertion of power control bit

Spread the information on the reverse CDMA channel to

identify the mobile stations

Long Code


32/85

Internal Use31


Short code is a PN sequence with period of 215

chips

Sequence with different time offset is used to distinguish different

sectors

Minimum PN sequence offset used is 64 chips, that is, 512 PN offsets are

available to identify the CDMA sectors (215

/64=512).

PNa

PNc

PNb

Short Code

S bli d S di


33/85

Internal Use32


64-order Walsh function is used as a spreading function and eachWalsh code is orthogonal to other

A Walsh can be presented by Wim

where ith (row) is the position and m

is the order. For example, W24

means 0101 code in W4 matrix

Walsh code is used to spread the forward traffic channel

W2n=Wn Wn

Wn Wn

W1=0

W2=0 0

0 1

W4 =

0 0

0 1

0 0

0 10 0

0 1

Walsh code

Walsh Code is one kind of orthogonal code.

1 1

1 0

Walsh Code

MS Whi h BTS I h ld li t ?


34/85

Internal Use33

MS: Which BTS I should listen?

A PN sequence (short code) with period of 215 bits, is used with 64bits offset. That is512 total PN available to identify the 512 sectors/BTSs.

BTS BBTS A

BTS C

MS B Whi h i i l?


35/85

Internal Use34

MS-B: Which is my signal?

Each MS has unique Walsh code. Normally CDMA2000 uses 64 array Walsh codes

MS-A

MS-B

MS-C

MS-D

MS-E

MS-F

MS-G

MS-H

0000000. A

0101010 B

0000111 C

01010100

BTS Wh i M D?


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Internal Use35

BTS: Who is my Mr. D?

A PN sequence (long code) with period of 242-1 bits which is used to Spread the

information on the reverse CDMA channel and identify the MS. A unique ESN is used as

mask to achieve unique starting point

MS-A

MS-B

MS-C

MS-D

MS-E

MS-F

MS-G

MS-H

M d l ti


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Internal Use36

Modulation

Q ti


38/85

Internal Use37

Questions

How to understand spreading and multi access?

What is the main function of each step in communication model ?

How to understand the three types of codes in CDMA2000 1X ?

Why do we say CDMA system is self interference system ?


39/85

Internal Use38


Chapter 2 Principle of spreading


Chapter 4 Physical layer of CDMA2000

Chapter 5 Number planning

T h l Of CDMA2000


40/85

Internal Use39

Technology Of CDMA2000

Power control

Rake Receiver Soft handoff

Power Control


41/85

Internal Use40

Power Control

no power control

after power control

Far/near problem exists in wireless system

Power Control


42/85

Internal Use41

Power Control

CDMA is a self-interference system

no power control

after power control

Power Control


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Internal Use42

Power Control

According to the directions, power control can be divided into:

Reverse power control

Forward power control

According to the types, power control can be divided into: Reverse power control

Reverse open loop power control

Reverse closed loop power control

Forward power control

Measurement report power control

EIB power control

Fast power control

Classification Of Power Control

Power Control


44/85

Internal Use43

Power Control

The mobile transmission power is determined by the following factors: Distance from the base station Load of the cell Circumstance of the code channels

The transmission power of the mobile station is relative to its received power.

Reverse Open Loop Power Control

BTSMobile

Reverse Open Loop

Power Control

BTS

BTS

TransmittingPower

Power Control


45/85

Internal Use44

Power Control

Reverse Closed Loop Power Control

BTS

Power Control Bit

Eb/Nt Value FER Value

Inner Loop Power Control

Outer Loop Power Control

Change in Eb/Nt Value

BSC

BTS

Power Control


46/85

Internal Use45

Power Control

Fast Forward Power Control

FER Measurement

MS

Power Control Bit

Eb/Nt Comparator

BTS

FEREb/Nt

RAKE Receiver


47/85

Internal Use46

RAKE Receiver

RAKE Receiver


48/85

Internal Use47

RAKE Receiver

RAKE receiver can mitigates

multi-path fading and enhance

the receive performance of

the system.

Receive set

Calculate the

time delay and

signal strength

Combiner

Correlator 1

Correlator 2

Correlator 3

Searcher correlator

output

Recover signal

from single path

and adjust its

time delay

90

0

0

90

Soft Handoff


49/85

Internal Use48

Soft Handoff

Pilot Sets

An active pilot is a pilot whose paging ortraffic channels are actually being monitoredor used.

The pilot that not in the active set but

potential to be demodulated

The pilot that not included in the active set or

the candidate set but being possible to be

added in the candidate set

Other pilot

Active Set

Candidate

Set

Neighbor

Set

Remaining

Set

Searchercorrelator

All pilot that can be detected by searchercorrelator is classify to four pilot set.

Soft Handoff


50/85

Internal Use49

Soft Handoff

Soft/softer handoff meansMS can keep traffic channel

with two or more sectors.

Soft handoffinvolves

traffic channel from

more than one BTS

and Multi-path

combination in the BSC.

Softer handoff

involves traffic channel

from two or more

sectors of one BTS and

Multi-path combination

in the BTS.

Soft Handoff And Softer Handoff

Soft Handoff


51/85

Internal Use50

Soft Handoff

Important Parameters of Soft handoff

SectorA

Add Threshold (T_ADD)

DropThreshold (T_DROP)

Time

Ec/Io

Sector

B

Guard Time(T-TDROP)

Soft Handoff Region

T_ADD, T_DROP and T_TDROP affect the percentage of MS in handoff.

T_ADD & T_DROP is the standards used to add or drop a pilot.

T_DROP is a timer.

Soft Handoff


52/85

Internal Use51

Soft Handoff

Dynamic Soft Handoff

Neighbor

Set

Candidate

Set

Active

Set

Candidate

Set

TIME

Active

Set

1 2 3 4 5 6 7 8

Neighbor

Set

T_TDROP T_TDROP

T_ADD

T_DRO

P

Pilot

strength P1P2

1. P2>T_ADD

2. P2> [(SOFT_SLOPE/8) * 10 * log10(PS1) + ADD_INTERCEPT/2].

4. P1< [(SOFT_SLOPE/8) * 10 * log10(PS2) +DROP_INTERCEPT/2]

7. P1


53/85

Internal Use52

Questions

Why CDMA system need power control ?

What is the function of the RAKE receiver ?

What is the difference between hard handoff and soft handoff ?

Why can CDMA system support soft handoff ?


54/85

Internal Use53






Physical Layer Of IS95


55/85

Internal Use54




56/85

Internal Use55


Forward pilot channel is spread over W0 and modulated with

short code directly BTS transmits the pilot channel continuously

The Pilot channel carries no data

Forward Link: Pilot Channel

Pilot channel

(all-zeros)

W064



57/85

Internal Use56


The sync channel is used by the mobile station to synchronize with

the network. W32 is used to spread Sync Channel.

The synchronization message includes:

Pilot PN sequence offset: PILOT_PN

System time: SYS_TIME

Long code state: LC_STATE

Paging channel rate: P_RAT

Here note that, sync channel rate is 1200bps

Forward Link: Sync Channel

ToQPSK

coder

2.4kbps 4.8kbps 4.8kbps

Codesymbol

Repetitive

code

symbol

1.2kbps

Convolution

encoderr=1/2,K=9

symbol

repetition

Block

interleaving

Sync Ch bits

W3264



58/85

Internal Use57


The paging channel transmits:

System parameters message

Access parameters

Neighbors list

CDMA channels list message

The frame length of a paging channel is 20ms

W1 ~ W7 are spared for the Paging Channels

spreading

ToQPSK

coder

Paging

channel bits

19.2/9.6Kbps 19.2kbps

19.2kbpsCode

symbol

9.6/4.8 kbps

Convolution

encoder

r=1/2,K=9

Symbol

repetitionBlock

interleaving

Paging channel address mask

Long

code PN

generator

decimator

1.2288Mcps

19.2kbps

W164

Forward Link: Paging Channel



59/85

Internal Use58


I Ch PN sequence (1.2288 Mcps)

PN 1.2288 Mcps

Repetitive

symbol

19.2kbps

8.6kbps9.6kbps

4.8kbps

2.4kbps1.2kbps

Add frame

quality indicator

bits(12,10,8,6)

Add 8

encoded tail

bits

Convolution

encoderr=1/2,K=9

Symbol

repetitionForward traffic

channel(172/80/40 or

16bits/frame)

Block

interleaver

19.2kbps

MUX

Long code

generator

Power control bits

Q Ch PN sequence (1.2288 Mcps)

Baseband

filter

I(t)

Q(t)decimator

+QPSK Modulation

4.0kbps2.0kbps0.8kbps

19.2ksybps

9.6ksybps

4.8ksybps2.4ksybps

Sin(2pfct)

Cos(2pfct)

Walsh code

decimator

+

+Baseband

filter

+

+

Forward Link: Traffic Channel (FCH And SCCH)



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Internal Use59


4.8 kbps (307.2kbps)

PN chips

1.2288 McpsOrthogonal spreading

28.8 kbps

Data burst

randomizer

Long code

PN

generator

Frame rate

Long code mask

Repetitive

symbol

Walsh code


Baseband

filter

I(t)

Q(t)

QPSK Modulation

Sin(2pfct)

Cos(2pfct)

+

+Baseband

filter

+

+


1/2 PN chips Delayed

time=406.9ns

Reverse Link: Access ChannelRepetitive

symbol

8.8 kbps

Code

symbol

14.4 kbps4.4 kbps 4.8kbpsAdd 8encoder tail

bits

Convolution

encoder

r=1/3,K=9

Symbol

repetitionAccess

channel

(80 bits/frame)

Block

interleaving



61/85

Internal Use60

y y

Reverse Link: Traffic Channel (FCH And SCCH)

8.6kbps9.6kbps

4.8kbps

2.4kbps

1.2kbps

Add framequality indicator

bits(12,10,8,6)

Add 8encoded tail

bits

convolutionencoder

r=1/3,K=9

Symbolrepetition

Reverse traffic

channel

Block

interleaver

4.0kbps

2.0kbps

0.8kbps

28.8Ksybps

14.4Ksybps

7.2Ksybps

3.6Ksybps

4.8 kbps (307.2kbps)

PN chips

1.2288 Mcps

Orthogonal spreading

Data burst

randomizer

Long code

PN

generator

Frame rate

Long code mask

Walsh code


Baseband

filter

I(t)

Q(t)

QPSK Modulation

Sin(2pfct)

Cos(2pfct)

+

+ Basebandfilter

+

+


1/2 PN chips Delayed

time=406.9ns

Physical Layer Of CDMA2000


62/85

Internal Use61

y y

Symbol

repetitionDefinition of IS2000s Channel:



63/85

Internal Use62

y y

Symbol

repetition

Forward Channel: F -QPCH

0 1 3 5 6 7 8 9 10 11 12 13 14 152047... 4

1.28SF-PCH

F-PCH

80ms

F-QPCH

1 32 4 1 2 3 4

20ms 20ms20ms20ms20ms20ms20ms20ms

A1 B1 A2 B2



64/85

Internal Use63

y y

Forward Channel: F-CCCH

20ms frame (9.6kbps)

172 information bits 12 CRC bits8 encoders

tails bits



tails bits



tails bits

172 information bits 16 CRC bits 8 encoders

tails bits

5ms frame (38.4kbps)With QPCH together, F-CCCH

shared by many mobiles carries

mobile-specific messages .



65/85

Internal Use64

y y

F-DCCH is a dedicated signaling

channel.

F-DCCH can carry user data that

is typically low-rate.

Forward Channel: F-DCCH

20ms frames (9.6kbps)

172 information bits12 CRC

bits

8 encoders

tails bits

5ms frames (9.6kbps)

24 information bits 16 CRC bits 8 encoder tails bits



66/85

Internal Use65

y y

Forward Channel: F-SCH

64

4

8

16

32

12

9600 19200 38400 76800 153600 307200 614400

Data rate -bps-

W01=0

W02=00

W12=01

W04=0000

W24=0011

W14=0101

W34=0110

W08=00000000

W48=00001111

W28=00110011

W68=00111100

W18=01010101

W5

8=01011010

W38=01100110

W78=01101001

( W016,W

816)

( W416,W

1216)

( W216,W

1416)

( W616,W

1416)

( W116,W

916)

( W516,W1316)

( W316,W

1116)

( W716,W

1516)

The different Walsh codes

corresponding to different data rates



67/85

Internal Use66

y y

The Function of Reverse Pilot Channel Initialization

Tracing

Reverse Coherent Demodulation

Power Control Measurement

Base station enhances the received

performance and increases the capacity by

means of coherent demodulation of the

Reverse Pilot Channel.

MUX A

Pilot(all '0's)

Power Control Bit

N is the Spreading Rate number

Pilot PowerControl

Power Control Group

= 1536 NPN Chips

384 NPN Chips

Reverse Pilot Channel

Reverse Channel: R-PICH



68/85

Internal Use67

y y

The Function of R-EACH

initiate communication with the base station and to respond

to a Paging Channel message

transmit its access request

Reverse Channel: R-EACH

R-EACH DataReverse Pilot Channel

Preamble (All 0s) R-EACH Frame Data

T preamble



69/85

Internal Use68

To support data traffic, the R-SCH has two unique characteristics:

only carry user traffic data and does not carry any signaling traffic

Should be set up and torn down rather quickly

Reverse Channel: R-SCH

R-FCH

R-SCH

Bursting data is coming

RC Combination Regulation


70/85

Internal Use69

Radio

Configuration

Spreading

Rate

Max Data Rate*

(kbps)

Effective FEC

Code Rate

OTD

Allowed

FEC EncodingModulation

1** 1 9.6 1/2 No Conv. BPSK2** 1 14.4 3/4 No Conv BPSK3 1 153.6 1/4 Yes Conv and Turbo QPSK4 1 307.2 1/2 Yes Conv and Turbo QPSK5 1 230.4 3/8 Yes Conv and Turbo QPSK6 3 307.2 1/6 Yes Conv and Turbo QPSK7 3 614.4 1/3 Yes Conv and Turbo QPSK

8 3 460.8 1/4 or 1/3 Yes Conv and Turbo QPSK9 3 1036.8 1/2or 1/3 Yes Conv and Turbo QPSK

Radio

Configuration

Spreading

Rate

Max Data Rate*

(kbps)

Effective FEC

Code Rate

OTD

AllowedFEC Encoding Modulation

1** 1 9.6 1/3 No Conv 64-ary ortho

2** 1 14.4 1/2 No Conv 64-ary ortho

3 1 153.6 1/4 Yes Conv or Turbo BPSK

(307.2) (1/2)4 1 230.4 3.8 Yes Conv or Turbo BPSK


(614.4) (1/3)


(1036.8) (1/2)

Reverse Radio Configuration

Forward Radio Configuration

RC Combination Regulation


71/85

Internal Use70

RC1 and RC2 corresponds respectively

to rate set 1 and rate set 2 in IS- 95A/B

system.

CDMA2000 Forward RC: RC1~RC5

Reverse RC: RC1~RC4

Rules:

Forward RC1, Reverse RC1


Forward RC3 or RC4,Reverse RC3


RC 1

RC 2

RC 3

RC 4

RC 5

RC 1

RC 2

RC 3

RC 4

RC 5

RC 3

RC 4

RC 4

RC 3

F-FCH RCs

R-DCCH/SCHRCsF-DCCH/SCHRCs

R-FCH RCs

Questions


72/85

Internal Use71

How many types channels are there in I595 system ? And what

are the functions of these channels ?

What is the function of F-SCH and R-SCH in CDMA 2000 ?

The capacity of CDMA2000 is more than that of IS95, could you

give reasons?

How do you understand radio configuration ?


73/85

Internal Use72






Definition of Coverage Areas


74/85

Internal Use73

Location area

MSC area

PLMN area

Service area

Sector

area

Cell area

MIN/IMSI (identity/international mobile subscriber identity )


75/85

Internal Use74

Mobile subscriber identity/international mobile subscriber identity

For example, 0907550001/460030907550001

15 digits

3 digits 2 digits

IMSI

MCC MNCMSIN

NMSI

ESN (Electronic Serial Number)


76/85

Internal Use75

023 17 182431

Manufacturers

numberRetained Equipment SN

A unique Electronic Serial Number (ESN) is used to identify single MS. An

ESN includes 32 bits and has the following structure:

For example, FD 03 78 0A (the 10th Motorola 378 mobile phone)

The equipment serial number is allocated by a manufacturer.

MDN (Mobile directory number)


77/85

Internal Use76

CC + MAC + H 0H 1H 2H 3 + ABCD

International mobile subscriber DN

National valid mobile subscriber number

Mobile directory number

For example, 8613307550001

subscriber number

TLDN (Temporary local directory number)


78/85

Internal Use77

+CC MAC H0H 1H2 ABC+ ++44

Temporary local directory numberFor example, 8613344755001

Location Area Identity (LAI)


79/85

Internal Use78

PAGING message is broadcast within a local area, the size of which

depends on traffic, paging bearer capability, signaling flow , etc.

Format: MCC+MNC+LAC

MCC: Mobile Country Code, 3 digits. For example, China is 460.

MNC: Mobile Network Code, 2 digits. For example, the MNC ofUnicom is 03.

LAC: Location Area Code, a 2-byte-long hexadecimal BCD code.

0000 cannot be used with FFFE.

For example, 460030100

Global Cell Identity (GCI)


80/85

Internal Use79

The unique ID of a cell in PLMN

Format: LAI+CI

CI: Cell Identity, a 2-byte-long hexadecimal BCD code, pre

defined by the engineering department. The first 3 digits and the

last digit represent the base station number and the sector number

respectively. For an omni-directional site, the last digit of CI is 0.

For example, 4600301001230 shows base station number 123

contains an omni-directional site

SID/NID


81/85

Internal Use80

In the CDMA2000 1X network, the service area consists of systemsand networks that are identified respectively by the system

identification (SID) and network identification (NID).

The system judges whether the MS is roaming according to the SID

and NID.

NID= t

NID= u NID= v

SID=L

SID=N

SID=K

SID=M

Number Analyzing According toMDN t th


82/85

Internal Use81

BTS

BSCMSC1/VLR MSC2/VLRBSC

BTS

13316882234

Number Analysis1331688XXXX

Find HLR

MDN, get the

IMSI that can

be used to

query VLR

Location

According to IMSI,

allocate TLDN thatwill be sent back to

HLR

Transfe

r TLDN

to

MSC1

With

TLDN,

connect

to MSC2

With IMSI,

send paging

information

to B

Here is a call for you

HLR

Questions


83/85

Internal Use82

Please describe the number analyzing in CDMA2000 1X

system when a call is happening .

Summary


84/85

Internal Use83

The difference of three types of multi-access

The function of each process in

communication mode

Three key techniques The physical layer of IS95 and CDMA2000

The number analysis during a call

Summary


85/85

Documents

Cdma2000 1x Principle Issue5[2].0