Diameter Signaling Analysis ISSUE1.00

7/25/2019 Diameter Signaling Analysis ISSUE1.00

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Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

USN9810 Diameter

Signaling Analysis


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Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. age2

Contents

1. Basic Concepts

2. Message Procedre Description


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!iameter "ignaling #verview

$$%$$%

H""H""

"&a"&a

"'"("'"("&d"&d


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Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. age)

*ormat o+ the !iameter $essage Header -

!ersion/ t indicates the !iameter protocol version. The 1ersion +ield must e set to - to indicate

!iameter version -.

Message "engt#/ t indicates the length o+ the !iameter message including the !iameter

message header.

Command $lags/ The Command *lags +ield is eight its. The +ollowing its are used and the

other its are reserved/

3/ The 3 it is 4nown as the 3e5uest it. + this it is set to -, the message is a re5uest.

/ The it is 4nown as the ro6iale it. + this it is set to -, the message may e pro6ied,relayed, or redirected. + this it is set to 0, the message must e locally processed.

%/ The % it is 4nown as the %rror it. + this it is set to -, the message contains a protocol

error. This it cannot e set to - in re5uest messages.

T/ The T it is 4nown as the otentially retransmitted message it. + this it is set to -, the

message is a retransmitted message.


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*ormat o+ the !iameter "ignaling Header 2 Command%Code/ t indicates the command code o+ the !iameter message to speci+y the

message type. Command7Code values 06*****% and 06****** are reserved +or e6perimental

use.

Application%&D/ t indicates the application !. This +ield is used to identi+y the application to which

the message is applicale. Currently, the 8"(9-0 supports "&a:"&d inter+ace applications, and

the application ! is -&;;;2


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*ormat o+ the !iameter "ignaling Header =

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!iameter protocol version. Currently, the

version must e -.

!iameter signalingcommand code Application type o+ the

!iameter messageHop7y7hop identi+ier

%nd7to7end identi+ier o+ the

message


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A1 Header *ormat

A!P Code/ t indicates the A1 type. 1alues 0 to 2


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ntroduction to >asic A1s

+rigin%'ost A!P/ The #rigin7Host A1 is o+ the !iameterdentity

type and identi+ies the !iameter endpoint that originates a

!iameter message. This A1 must e present in all !iameter

messages. !iameter relay agents cannot modi+y this A1 during

!iameter message +orwarding.

+rigin%,ealm A!P/ The #rigin73ealm A1 is o+ the

!iameterdentity type and contains the realm o+ the originator o+

a !iameter message. This A1 must e present in all !iametermessages.

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!iameter "ignaling Classi+ication

$essage Type !escription!iameter ?atchdog 3e5uest:3esponse They are !iameter lin4 detection messages used to proactively detect lin4

status.

Capailities %6change 3e5uest :3esponse They are used to e6change the in+ormation aout applications and

identities o+ !iameter entities etween !iameter nodes.

8pdate Location 3e5uest:3esponse They are location update messages. !uring the attach and handover

procedures o+ a user e5uipment 8%, the $$%:"'"( instructs the H""

to update the current location in+ormation aout the 8% and otains

suscription data +rom the H"".

Cancel Location 3e5uest:3esponse They are location cancellation messages. !uring a handover, the H""

instructs the original $$%:"'"( to delete the stored 8% suscription

data.

nsert "uscrier !ata 3e5uest:3esponse The H"" delivers or updates suscription data to the $$%:"'"(.

!elete "uscrier !ata 3e5uest:3esponse The H"" instructs the $$%:"'"( to delete suscription data.

urge 8% The $$%:"'"( in+orms the H"" that the suscription data o+ the 8% is

deleted +rom the $$%:"'"(.

Authentication n+ormation 3etrieval The $$%:"'"( re5uests the suscription data o+ the 8% +rom the H"".

3eset A+ter a reset, the H"" in+orms the $$%:"'"( o+ the reset.

(oti+ication The $$%:"'"( in+orms the H"" o+ related in+ormation.

!iameter messages are typically used +or the communication etween the

$$%:"'"( and the H"". The message types are as +ollows/

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!iameter (ode (etwor4ing !iameter nodes are as +ollows/

!iameter client/ proactively originates connection estalishment re5uests.

!iameter server/ handles authentication, authori@ation, and accounting

re5uests +or a particular realm.

!iameter agent/ provides relay, pro6y, redirection and translation services

o+ !iameter signaling on the !iameter networ4. The +our types o+ !iameter

agents are as +ollows/

3elay Agent

ro6y Agent

3edirect Agent

Transaction Agent

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!iameter 3outing rocedure

age--

H""

$$%

!3A- !3A2 !3A=

H""

$$%

#perator- #perator2

(ote/ n the +igure, !3As are !iameter agents. 'enerally, !3A- and

!3A= are pro6y agents or redirect agents.


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Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. age-2

Contents

1. Basic Concepts

2. Message Procedre Description

B "in- Detection

B Capa(ility Negotiation

B "ocation Update

B "ocation Cancellation

B At#entication Set AcisitionB S(scription Data &nsertion

B S(scription Data Deletion


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!iameter Lin4 !etection -

!evice ?atchdog 3e5uest:Answer

!iameter lin4 detection etween devices is implemented y means o+ e6changing !evice

?atchdog 3e5uest and !evice ?atchdog Answer messages. !iameter lin4 detection is

originated y the !iameter client.

The lin4 detection interval is controlled y the !iameter component. Currently, the interval

is -0 seconds. The 4ey A1s in the !evice ?atchdog 3e5uest !?3 messages are as +ollows/

#rigin7Host/ t indicates the host name o+ the originator.

#rigin73ealm/ t indicates the realm name o+ the originator.

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Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. age-)

Analysis o+ the !evice ?atchdog 3e5uest $essage

!iameter host name o+

the originator

!iameter realm name

o+ the originator


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!iameter Lin4 !etection 2

The 4ey A1s in the !evice ?atchdog Answer message are as +ollows/

3esult7Code/ t is carried in an answer message and indicates whether a particular

re5uest is completed success+ully or an error occurs. + the value is 200- diameter7

success, it indicates that the re5uest is completed success+ully.

#rigin7Host/ t indicates the host name o+ the originator.

#rigin73ealm/ t indicates the realm name o+ the originator.

age-3 in+ormation,

including the suscried ma6imum

re5uested andwidth in the uplin4

and ma6imum re5uested

andwidth in the downlin4

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"uscription !ata nsertion =

The 4ey A1s in the nsert "uscrier !ata Answer !A message are as

+ollows/ 3esult7Code/ t is carried in an answer message and indicates whether a particular re5uest is

completed success+ully or an error occurs. + the value is 200- diameter7success, the re5uest is

completed success+ully.

3AT7Type/ t is conditional and indicates the 3AT type that the 8% uses in the last access.

!A7*lags/ t is conditional and indicates the +lag in+ormation aout the !A message.

%"78ser7"tate/ t is conditional and is contained only in the !3 message. t indicates the userstate.

%"7Location7n+ormation/ t is conditional and is contained only in the !3 message. t indicates

the user location in+ormation.

Common values o+ the 3esult7Code A1 are as +ollows/

!A$%T%3E%33#3E8"%3E8(K(#?(/ This result code indicates that the user identi+ied y

the $" is un4nown, that is, the identi+ied 8% does not attach to the $$%:"'"(.

!A$%T%3E8(A>L%ET#EC#$L/ This result code indicates that the $$%:"'"( cannot

respond to the re5uest +rom the H"" due to +ailures in the $$%:"'"(, such as dataase

+ailures.

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"uscription !ata !eletion -

!elete "uscrier !ata 3e5uest:Answer/

The H"" uses this procedure to delete partial 8% suscription data stored on the $$%:"'"(.

The location cancellation procedure is used to delete all suscription data o+ a 8% stored on the

$$%:"'"(, whereas this procedure is used to delete partial suscription data o+ a 8% stored onthe $$%:"'"(.

rocedure triggering/

This procedure is triggered when some suscription data o+ a user is deleted +rom the H"".

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"uscription !ata !eletion 2

The 4ey A1s in the !elete "uscrier !ata 3e5uest !"3 message are as

+ollows/

8ser7(ame/ t is mandatory and indicates the $" o+ the user.

!"A7*lags/ t is mandatory and indicates the +lag in+ormation aout the !"3 message.

Conte6t7denti+ier/ t is conditional and indicates ! o+ the !( suscription conte6t or'3"7! conte6t that is to e deleted.

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8ser $"

Analysis o+ the !elete "uscrier !ata 3e5uest $essage

*lag in+ormation aout the !"3 message. Here,

the A1 indicates that all %A A( con+iguration

data is deleted +rom the suscription data.

" i ti ! t ! l ti =


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"uscription !ata !eletion =

The 4ey A1s in the !elete "uscrier !ata Answer !"A message are as

+ollows/ 3esult7Code/ t is carried in an answer message and indicates whether a particular

re5uest is completed success+ully or an error occurs. + the value is 200- diameter7

success, the re5uest is completed success+ully.

!A7*lags/ t indicates the +lag in+ormation aout the !A message.

Common values o+ the 3esult7Code A1 are as +ollows/

!A$%T%3E%33#3E8"%3E8(K(#?(/ This result code indicates that the user

identi+ied y the $" is un4nown, that is, the identi+ied 8% does not attach to the

$$%:"'"(.

!A$%T%3E8(A>L%ET#EC#$L/ This result code indicates that the $$%:"'"(cannot respond to the re5uest +rom the H"" due to +ailures in the $$%:"'"(.

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3esult code. Here, the

result code indicates that

an error occurs.

Analysis o+ the !elete "uscrier !ata Answer $essage


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Diameter Signaling Analysis ISSUE1.00

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