ETSI TS 132 158 V15.4.0 (2020-03)

LTE; 5G; Management and orchestration;Design rules for REpresentational State Transfer (REST) Solution Sets (SS) (3GPP TS 32.158 version 15.4.0 Release 15)

RTS/TSGS-0532158vf40

General Information

• Status: Published
• Publication Date: 30-Mar-2020
• Technical Committee: 3GPP SA 5 - Telecom Management
• Current Stage: 12 - Completion
• Completion Date: 31-Mar-2020

Standards Content (Sample)

ETSI TS 132 158 V15.4.0 (2020-03)






TECHNICAL SPECIFICATION
LTE;
5G;
Management and orchestration;
Design rules for REpresentational State Transfer (REST)
Solution Sets (SS)
(3GPP TS 32.158 version 15.4.0 Release 15)

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3GPP TS 32.158 version 15.4.0 Release 15 1 ETSI TS 132 158 V15.4.0 (2020-03)



Reference
RTS/TSGS-0532158vf40
Keywords
5G,LTE
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3GPP TS 32.158 version 15.4.0 Release 15 2 ETSI TS 132 158 V15.4.0 (2020-03)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
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Legal Notice
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities. These shall be
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The cross reference between 3GPP and ETSI identities can be found under http://webapp.etsi.org/key/queryform.asp.
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
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"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI

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3GPP TS 32.158 version 15.4.0 Release 15 3 ETSI TS 132 158 V15.4.0 (2020-03)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 5
1 Scope . 6
2 References . 6
3 Definitions and abbreviations . 7
3.1 Definitions . 7
3.2 Abbreviations . 7
4 General rules . 7
4.1 Information models and resources . 7
4.1.1 Information models . 7
4.1.2 Resources . 7
4.1.3 Resource archetypes . 7
4.1.4 Mapping of information models to resources . 8
4.2 Managed object naming and resource identification . 8
4.2.1 Managed object naming . 8
4.2.1.0 Distinguished Name (DN) . 8
4.2.1.1 Global and local namespaces . 8
4.2.2 Resource identification . 8
4.2.3 Mapping of DNs to URIs . 9
4.3 Media types . 10
4.4 URI structure . 10
4.5 Response status codes . 10
5 Basic design patterns . 11
5.1 Design pattern for creating a resource . 11
5.1.1 Creating a resource with identifier creation by the MnS Producer . 11
5.1.2 Creating a resource with identifier creation by the MnS Consumer . 11
5.2 Design pattern for reading a resource . 12
5.3 Design pattern for updating a resource . 12
5.4 Design pattern for deleting a resource . 13
5.5 Design pattern for subscribe/notify . 13
5.5.1 Concept . 13
5.5.2 Subscription creation . 13
5.5.3 Subscription deletion . 14
5.5.4 Notification emission . 14
5.5.5 Subscription retrieval . 14
6 Advanced design patterns . 15
6.1 Design pattern for scoping and filtering . 15
6.1.1 Introduction. 15
6.1.2 Query parameters for scoping . 15
6.1.3 Query parameters for filtering . 16
6.1.4 Construction rules for the response message body . 16
6.2 Design pattern for attribute and attribute field selection . 16
6.2.1 Introduction. 16
6.2.2 Query parameters for attribute and attribute field selection . 17
6.3 Design pattern for partially updating a resource . 17
6.4 Design pattern for patching multiple resources . 18
6.4.1 Introduction. 18
6.4.2 3GPP JSON Merge Patch . 18
6.4.3 3GPP JSON Patch . 18
7 Resource representation formats . 19
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3GPP TS 32.158 version 15.4.0 Release 15 4 ETSI TS 132 158 V15.4.0 (2020-03)
7.1 Introduction . 19
7.2 Top-level object . 19
7.3 Data objects . 19
7.4 Data arrays. 20
7.5 Error objects . 20
7.6 Resource objects . 20
7.7 Resource objects carried in data objects and arrays . 21
8 REST SS specification template . 22
Annex A (informative): Examples . 25
A.1 Example information model . 25
A.2 Retrieval of resources . 26
A.2.1 Retrieval of a single complete resource with HTTP GET . 26
A.2.2 Attribute and attribute field selection on a single resource . 28
A.2.3 Retrieval of multiple complete resources using scoping and filtering . 28
A.3 Creation of resources . 29
A.3.1 Creation of a resource with HTTP PUT . 29
A.3.2 Creation of a resource with HTTP POST . 30
A.3.3 Creation of a resource with JSON Patch . 30
A.4 Deletion of resources . 31
A.4.1 Deletion of a resource with HTTP DELETE . 31
A.4.2 Deletion of multiple resources with HTTP DELETE . 31
A.4.3 Deletion of a resource with JSON Patch . 31
A.5 Complete update of a resource . 31
A.6 Partial update of a resource . 32
A.6.1 Partial update of a resource with JSON Merge Patch . 32
A.6.2 Partial update of a resource with 3GPP JSON Merge Patch . 32
A.6.3 Partial update of a resource with JSON Patch . 33
A.6.4 Partial update of a resource with 3GPP JSON Patch . 33
A.7 Manipulating multiple resources . 34
A.7.1 Manipulating multiple resources with 3GPP JSON Merge Patch . 34
A.7.2 Manipulating multiple resources with 3GPP JSON PATCH . 35
Annex B (informative): Change history . 36
History . 37


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3GPP TS 32.158 version 15.4.0 Release 15 5 ETSI TS 132 158 V15.4.0 (2020-03)
Foreword
This Technical Specification has been produced by the 3rd Generation Partnership Project (3GPP).
The contents of the present document are subject to continuing work within the TSG and may change following formal
TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an
identifying change of release date and an increase in version number as follows:
Version x.y.z
where:
x the first digit:
1 presented to TSG for information;
2 presented to TSG for approval;
3 or greater indicates TSG approved document under change control.
y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,
updates, etc.
z the third digit is incremented when editorial only changes have been incorporated in the document.
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3GPP TS 32.158 version 15.4.0 Release 15 6 ETSI TS 132 158 V15.4.0 (2020-03)
1 Scope
The present document defines design rules for REpresentational State Transfer (REST) Solution Sets (SS). These rules
are applied when specifying REST Solution Sets.
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
- References are either specific (identified by date of publication, edition number, version number, etc.) or
non-specific.
- For a specific reference, subsequent revisions do not apply.
- For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including
a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same
Release as the present document.
[1] 3GPP TR 21.905: "Vocabulary for 3GPP Specifications".
[2] IETF RFC 7231: "Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content".
[3] 3GPP TS 32.300: "Telecommunication management; Configuration Management (CM); Name
convention for Managed Objects".
[4] IETF RFC 3986: "Uniform Resource Identifier (URI): Generic Syntax".
[5] IETF RFC 7230: "Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing".
[6] IETF RFC 7159: " The JavaScript Object Notation (JSON) Data Interchange Format".
[7] draft-wright-json-schema-01 (October 2017): "JSON Schema: A Media Type for Describing JSON
Documents".
Editor's note: The above document cannot be formally referenced until it is published as an RFC.
[8] draft-wright-json-schema-validation-01 (October 2017: "JSON Schema Validation: A Vocabulary
for Structural Validation of JSON".
Editor's note: The above document cannot be formally referenced until it is published as an RFC.
[9] draft-wright-json-schema-hyperschema-01 (October 2017): "JSON Hyper-Schema: A Vocabulary
for Hypermedia Annotation of JSON.
Editor's note: The above document cannot be formally referenced until it is published as an RFC.
[10] OpenAPI Specification (https://github.com/OAI/OpenAPI-Specification)
[11] IETF RFC 5789: "PATCH Method for HTTP".
[12] IETF RFC 7396: "JSON Merge Patch".
[13] IETF RFC 6902: "JavaScript Object Notation (JSON) Patch".
[14] IETF RFC 6901: "JavaScript Object Notation (JSON) Pointer".
[15] XML Path Language (XPath) Version 1.0, W3C Recommendation 16 November 1999
(https://www.w3.org/TR/xpath-10/)
[16] 3GPP TR 32.160: "Management and orchestration; Management service template".
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3GPP TS 32.158 version 15.4.0 Release 15 7 ETSI TS 132 158 V15.4.0 (2020-03)
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the terms and definitions given in 3GPP TR 21.905 [1] and the following
apply. A term defined in the present document takes precedence over the definition of the same term, if any, in 3GPP
TR 21.905 [1].
3.2 Abbreviations
For the purposes of the present document, the abbreviations given in 3GPP TR 21.905 [1] and the following apply. An
abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in
3GPP TR 21.905 [1].
CRUD Create, Retrieve, Update, Delete
DC Domain Component
DN Distinguished Name
DNS Domain Name Service
FQDN Fully Qualified Doman Name
HTTP Hypertext Transfer Protocol
JSON JavaScript Object Notation
LDN Local Distinguished Name
MnS Management Service
REST REpresentational State Transfer
RPC Remote Procedure Call
TCP Transmission Control Protocol
URI Uniform Resource Identifier
4 General rules
4.1 Information models and resources
4.1.1 Information models
An information model is a representation of a system. Typical models do not reflect all facets of the system, but only
certain aspects required to solve the management problem the model is designed for. 3GPP follows an object-oriented
modelling approach. Models are built from managed object classes. Relationships between classes represent the logical
connections. Models are specified formally with class diagrams of the Unified Modelling Language (UML).
The instantiation of a managed object is called managed object instance. All managed object instances together with the
relationships between them are depicted in an object diagram.
4.1.2 Resources
HTTP uses a different terminology based on the notion of resources, as defined in clause 2 of RFC 7231 [2]. Each
resource is represented by a resource representation as defined in clause 3 of RFC 7231 [2]. Valid resource
representations are e.g. XML instance documents or JSON instance documents.
4.1.3 Resource archetypes
Resources can be classified according to their structure and behaviour into resource archetypes. This helps specifying
clear and understandable interfaces. The following three archetypes are defined:
- Document resource: This is the standard resource containing data in form of name value pairs and links to
related resources. This kind of resource typically represents a real-world object or a logical concept.
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3GPP TS 32.158 version 15.4.0 Release 15 8 ETSI TS 132 158 V15.4.0 (2020-03)
- Collection resource: A collection resource is grouping resources of the same kind. The resources below the
collection resource are called items of the collection. An item of a collection is normally a document resource.
Collection resources typically contain links to the items of the collection and information about the collection
like the total number of items in the collection. Collection resources can be further distinguished into server-
managed and client-managed resources. Collection resources are also known as container resources.
- Operation resource: Operation resources represent executable functions. They may have input and output
parameters. Operation resources allow some sort of fall back to an RPC style design in case application specific
actions cannot be mapped easily to CRUD style operations.
4.1.4 Mapping of information models to resources
RESTful SS shall be specified in a way that managed object instances are described by document resources. Collection
resources have no equivalent in an information model unless some dedicated collection class is introduced.
4.2 Managed object naming and resource identification
4.2.1 Managed object naming
4.2.1.0 Distinguished Name (DN)
The Distinguished Name (DN) is used in 3GPP to uniquely identify a managed object instance within a specific name
space. The DN is a comma (",") separated list of Relative Distinguished Names (RDNs). Each managed object instance
has an associated RDN. The sequence of RDNs is governed by name containment relationships in the UML class
diagram describing the modelled network. The RDN consists of a naming attribute name separated by an equal sign
("=") from the naming attribute value. The naming attribute name is equal to the class name of the MOI.
In addition to the RDNs associated to a managed object instance the DN may have as leftmost RDN whose naming
attribute name is "DC" (Domain Component) and whose value is a domain name. A DN with DC is globally unique.
The DN concept is described in detail in TS 32.300 [3].The following example DN has a DC.
DN = "DC=operatorA.com,subNetwork=south,managedElement=a,eNBFunction=1,cell=1"
4.2.1.1 Global and local namespaces
A DN in the global name space is globally unique and starts with the RDN of the global root. A DN in a local name
space starts with the RDN of the local root and is unique only within this name space. A DN in a local namespace is
also referred to as Local Distinguished Name (LDN). The DN of the local root relative to the global root is called DN
prefix. The concatenation of DN prefix and LDN is equal to the globally unique DN of a managed object.
The local root is typically the root of the network resource model representing the managed network.
4.2.2 Resource identification
HTTP uses a subset of the generic Uniform Resource Identifier (URI) scheme (RFC 3986 [4]) defined in RFC 7230 [5]
for target resource identification.
http-URI = "http:" "//" authority path-abempty [ "?" query ] [ "#" fragment ]
The path component is an absolute path (one that starts with a single slash character) or empty.
The origin server is identified by the authority component, which includes a host identifier and an optional path TCP
port. The hierarchical path component and optional query component serve as an identifier for a potential target
resource within that origin server’s name space. The optional fragment component allows for indirect identification of a
secondary resource.The host identifier is either an IP address or an indirect identifier such as a FQDN to be resolved
with DNS.
URIs are used by HTTP for routing and addressing of target resources. They shall not be used for other purposes or as
an alternative for DNs.
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3GPP TS 32.158 version 15.4.0 Release 15 9 ETSI TS 132 158 V15.4.0 (2020-03)
4.2.3 Mapping of DNs to URIs
URIs are globally unique. For this reason only a globally unique DN with DC is mappable into a URI. The mapping
rules are as follow:
- The DN prefix is mapped semantically to the authority component of the URI. The syntax of the DN prefix is
modified to match the syntax of the authority component.
- The LDN is mapped semantically to the path component of the URI. The syntax of the LDN is modified to
match the syntax of the path component.
When mapping a LDN the equal sign "="shall be used as delineator between the naming attribute name and naming
attribute value when constructing a RDN.
URI-RDN = {namingAttributeName} "=" {namingAttributeValue}

The URI-LDN is the concatenation of URI-RDNs separated by a slash "/".
URI-LDN = *( "/" RDN )

For example, the LDN
LDN = "subNetwork=south,managedElement=a,eNBFunction=1,cell=1"

maps to
URI-LDN = "/subNetwork=south/managedElement=a/eNBFunction=1/cell=1"

and the LDN
LDN = "managedElement=a,eNBFunction=1,cell=1"

to
URI-LDN = "/managedElement=a/eNBFunction=1/cell=1"

When constructing the authority part from the DN prefix, it shall be reformatted according to the name conventions
applying to FQDNs. For example, the DN prefix
DN-prefix = "DC=operatorA.com"

maps to
URI-DN-prefix = "operatorA.com"

and the DN prefix
DN-prefix = "DC=operatorA.com,subNet
...