7/25/2019 sb_elab_uri

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3G IMS Illustrated(3rd Level)

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3G kt !"#ain Basics

$"ntents

%r"# $kt/kt &" IMS

3G IMS Arc'itecture

Intr"ducti"n

Better Communication

3G IMS perati"n

&akea*reakA**rev+IMS

,RI (,RL)

URIstands for Uniform Resource Identifier. It is also the first name of the writer of thisexplanation, but that's another story :-

It is a means of unambi!uously locatin! a resource on the Internet. "ypicallyresource is a file #such an $"%& or I( etc, but it may also be an email address #%ail URpro!ram or a )I* address #)I* URI+. $istorically there were two types of URIs: UR& an

UR& #Uniform Resource &ocator is a pointer to a particular resource on the Internet aparticular location. (or instance: the UR& http://www.nwu.edu/index.html0 points at tlocation of the file index.html0 at bein! stored on the computer #host www0, which is l

the domain nwu.edu0. #"hus a 1) 2uery with the input www.nwu.edu0 to the 1) sewhich is in char!e of this domain, will return the I* address of the host www0

UR #Uniform Resource ame is a pointer to a particular resource on the Internet, bureference to a particular location. "he idea behind the UR, was to efficiently and con3ehandle resources that mi!ht be mirrored in se3eral locations, or that ha3e mo3ed from onanother.

UR&/UR/URI are defined in R(C 4567- 8Uniform resource identifiers #URI: !eneric

R(C 4567, u!ust 966.

http://www.ietf.org/rfc/rfc2396.txthttp://sbmain_help.ppt/http://www.ietf.org/rfc/rfc2396.txt

7/25/2019 sb_elab_uri

2/2

3G IMS Illustrated(3rd Level)

Back

Marketing Aspects

References/Quiz

3G kt !"#ain Basics

$"ntents

%r"# $kt/kt &" IMS

3G IMS Arc'itecture

Intr"ducti"n

Better Communication

3G IMS perati"n

&akea*reakA**rev+IMS

,RI (,RL)

In practice, the use of URs pro3ed to be 3ery complicated, and still under acti3e researcreality it is mostly UR&s which are bein! used, and thus when we say URI or UR& we actuthe same thin!.

;ri!inally, the basic syntax of a UR& was: protocol://hostnames

$owe3er some UR&s #such as: mailto, sip ha3e the structure of protocol:user?host0 #wmi!ht be either the (@1 of a specific computer, or an Internet domain.

(or instance, the )I* UR&: sip:bob?domain.com0 identifies the )I* address of the )I*"he mailto UR& mailto:lisa?ci!.mot.com0 identifies the mail address of &isa.

)ince )I* address has a notion of phone number, rather than a specific address, the )I*specification is in fa3or of usin! the !lobal term )I* URI.

"his emphasiAes on the )I* principle of *ersonal mobility #i.e., a user is not physically tiespecific location/physical-end-de3ice, but can use any de3ice, which is nown to the )I*

anywhere.

http://sbmain_help.ppt/