18-Cdmabss v5 Principle

8/11/2019 18-Cdmabss v5 Principle

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Huawei Confidential. All Rights Reserved

V5 PrinciplesV5 PrinciplesIssue 2.0Issue 2.0

Internal Use

ChapterChapter 1 Basic Concepts1 Basic Concepts

Chapter 2 Protocols

Chapter 3 Protection Group

Chapter 4 Application


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Internal Use

LE

Z interface

Z interface: 2-wire analog interface

Traditionally, POTS subscribers areconnected directly to LE via Z interface

Introduction: Z interfaceIntroduction: Z interface

Internal Use

Digital MUX

LE

With the emerging of digital MUX anddigital terminal, there is arequirement for digital interface

Introduction: Z interfaceIntroduction: Z interface


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Internal Use

V interface : digital interface on the user side ofLE.

V5.1: ITU-T Recommendation G.964

V5.2: ITU-T Recommendation G.965

Introduction: V interfaceIntroduction: V interface

Internal Use

V5

V5 is the digital interface between LE andAN which is standard and open for narrowband service, classified as V5.1 and V5.2

ANRAC

LE

Introduction: What is V5?Introduction: What is V5?


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Internal Use

E1 link 1

E1 link 3E1 link 2

V5.2 V5.2

Maximum 16 E1 links in one V5.2 interfaceAny/all E1 links may use a transparent digital link

LE AN

Transparent Channel

Physical Composition (1)Physical Composition (1)

Internal Use

LE

V5.2 INTERFACE

CAIE card provides E1 interfaceCLCB card processes V5.2 protocol

DTF

E1

In CDMA WLL System:

AN(RAC)

CAIE

V5.2 interface in CDMA WLL SystemV5.2 interface in CDMA WLL System


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Internal Use

ONE FRAME

E1 frame is divided into 32 TDM slotsThey are number as TS0,TS1.... TS31TS0 is a frame slot for frame synchronizationTS16, 15 and 31 can be used to carry V5 protocolinformation, and TS16 has a priorityOthers are used to carry PCM encoded voiceinformation from PSTN port

... TS0 TS1 TS15 TS16 TS30 TS31 TS0 ...

Physical Composition (2)Physical Composition (2)

Internal Use

A 64k time slot on a V5.2 interfaceprovisioned to carry protocol information.

A 64k time slot used to provide the bi-directional transmission capability for PCMencoded 64Kbit/s channel from PSTN userports.

Physical Communication Channel:

Bearer channel:

Two important conceptsTwo important concepts


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Internal Use

V5.2 interface support both BRA and PRA,but V5.2 doesn't process the informationfrom ISDN port, it just transfers theinformation to LE transparently.D channel information is multiplexed andcarried on physical C-channel.B channel information is carried on bearer

channel.

About ISDNAbout ISDN

Internal Use

............

Secondary link

Other possible C channels

TS0 TS1 TS14 TS15 TS16 TS17 TS30 TS31......

.....

......

.

.....

.

......

.....

......

.

.....

.

n+1

n+3

n+5

3n-1

n+2

n+4

n+6

3n

31

1

2

3

n

......

Primary link

Other link

Other link

Frame overhead

Compulsorychannel (V5)

Bearer channel (traffic)

n is the number of the links configured for V5.2 interface1,2,3......3n is the sequence for C channel configuration.

Rules for the Selection of Physical C ChannelsRules for the Selection of Physical C Channels


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Internal Use

V5.2 interface includes5 protocols, they are:

PSTN

BCC(Bearer Channel Connection)

CONTROL

LINK CONTROLPROTECTION

Five protocols of V5.2Five protocols of V5.2

Internal Use

BCC

CONTROL

L-CONTROL

PROTECTION

Physical C Channel

Logical C channelPSTN

Communication Path, Logical C Channel, Physical CCommunication Path, Logical C Channel, Physical C

Channel (1)Channel (1)


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Internal Use

BCC

CONTROL

L-CONTROL

PROTECTION

Physical C Channel

Logical C channel

PSTN

ISDNPhysical C Channel


ISDN

Communication Path, Logical C Channel, Physical CCommunication Path, Logical C Channel, Physical CChannel (2)Channel (2)

Internal Use

BCC

CONTROL

L-CONTROL

PROTECTION

Physical C Channel


PROTECTION Physical C Channel

Primary Link and Secondary LinkPrimary Link and Secondary Link


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Internal Use

Active C channel

Active Cchannel

Standby C channel

Standby C channel

BCC

CONTROL

L-CONTROL

PROTECTION

Physical C Channel

Logic C channel

PROTECTION Physical C Channel

PSTN

ISDNPhysical C Channel

Logic C channelPSTN

ISDN

Physical C Channel

Active C Channel and Standby C ChannelActive C Channel and Standby C Channel

Internal Use

v5digital

analog

The connection of LE and PSTN ports

analog

Digital MUX

LE

AN

PSTN protocol (1)PSTN protocol (1)


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Internal Use

user A

user B

stimulator a

stimulator b

addr A+stim a

addr B+stim b

protocol information(interpreted line state info)

stimulator: hook-off, hang up, ......

The PSTN protocol is basically a stimulus protocol.

LE

AN

PSTN protocol (2)PSTN protocol (2)

digital

PSTN user port

Internal Use

This protocol enables V5.2 interface bearer channels tobe allocated or de-allocated based on a call.

The BCC protocol provides the means for the LE torequest the AN to establish and release connectionsbetween a specific AN user port and a specific

V5.2 interface bearer channel.

BCC protocol (1)BCC protocol (1)


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Internal Use

These three telephones are busy, the BCC protocol hasallocated a bearer channel (time slot) for each of them

TS26

TS10

TS10

TS10 TS26

TS10

LE AN

0

1

n

A

B

C

BCC protocol (2)BCC protocol (2)

Internal Use

The control protocol is composed of a subscriber portcontrol part and a V5 interface common control part.

If a user's service is interrupted by a system fault or amaintenance operation, this user port must be blocked.After the recovery of system fault or the maintenanceoperation ended, the user port must be unblocked.

Port control:

CONTROL protocol (1)CONTROL protocol (1)


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Internal Use

An important function of CONTROL protocol isto verify V5 ID.V5 ID: a integer(0~2 24 -1) assigned to both side ofV5.2 interface which must be equal.When the V5.2 interface start or restart, thecontrol protocol will verify the V5 ID on bothsides. If the verification is not a success, the start

process will be terminated.

Common control:

CONTROL protocol (2)CONTROL protocol (2)

Internal Use

Since the V5.2 interface may consist of multiple2048 kbit/s links, there is a need for link verificationand for blocking /unblocking of a specific link.Three procedures have been defined for thesefunctions, which perform specific link managementat both sides of V5.2 interface.

Events and failure reports

Link identification

Link blocking & unblocking

LINK control protocol (1)LINK control protocol (1)


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Internal Use

LE AN

TS16

TS16

ACTIVE C-CHANNEL

STANDBY C-CHANNEL

The switch-over of protocol information

LE

AN

PROTECTION protocolPROTECTION protocol

Internal Use

LE1 AN1

LE2 AN2

V5.2

A

B

C

D

......

......

011601

01

016

V5.2

V5.2

V5.2

The application of multiple V5.2The application of multiple V5.2


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Internal Use

The introduction of V5 interfaceThe introduction of V5 interface

Important conceptsImportant concepts

The five protocol in V5.2 interfaceThe five protocol in V5.2 interface

The application of multiple V5.2 interfaceThe application of multiple V5.2 interface

SummarySummary

Bearer Channel / Physical C Channel CPath & Logic C Channel &Active C Channel &

Standby C Channel

Internal Use

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18-Cdmabss v5 Principle