idnits 2.17.1
draft-geng-teas-network-slice-mapping-01.txt:
Checking boilerplate required by RFC 5378 and the IETF Trust (see
https://trustee.ietf.org/license-info):
----------------------------------------------------------------------------
No issues found here.
Checking nits according to https://www.ietf.org/id-info/1id-guidelines.txt:
----------------------------------------------------------------------------
No issues found here.
Checking nits according to https://www.ietf.org/id-info/checklist :
----------------------------------------------------------------------------
** There are 2 instances of too long lines in the document, the longest one
being 2 characters in excess of 72.
Miscellaneous warnings:
----------------------------------------------------------------------------
== The copyright year in the IETF Trust and authors Copyright Line does not
match the current year
== The document doesn't use any RFC 2119 keywords, yet seems to have RFC
2119 boilerplate text.
-- The document date (April 23, 2020) is 1463 days in the past. Is this
intentional?
Checking references for intended status: Informational
----------------------------------------------------------------------------
== Outdated reference: A later version (-06) exists of
draft-contreras-teas-slice-nbi-01
Summary: 1 error (**), 0 flaws (~~), 3 warnings (==), 1 comment (--).
Run idnits with the --verbose option for more detailed information about
the items above.
--------------------------------------------------------------------------------
2 Network Working Group X. Geng
3 Internet-Draft J. Dong
4 Intended status: Informational Huawei Technologies
5 Expires: October 25, 2020 R. Pang
6 China Unicom
7 L. Han
8 China Mobile
9 T. Niwa
10 KDDI
11 J. Jin
12 LG U+
13 C. Liu
14 China Unicom
15 N. Nageshar
16 Individual
17 April 23, 2020
19 5G End-to-end Network Slice Mapping from the view of Transport Network
20 draft-geng-teas-network-slice-mapping-01
22 Abstract
24 Network Slicing is one of the core featrures in 5G. End-to-end
25 network slice consists of 3 major types of network segments: Access
26 Network (AN), Mobile Core Network (CN) and Transport Network (TN).
27 This draft describes the procedure of mapping relationship between 5G
28 end-to-end network slice and transport network slice defined in IETF.
29 This draft also intends to expose some gaps in the existing network
30 management plane and data plane to support inter-domain network slice
31 mapping. Further work may require cooperation between IETF and 3GPP
32 (or other standard organizations). The definition of data model,
33 signaling protocol extension and new encapsulation are out of the
34 scope of this draft.
36 Requirements Language
38 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
39 "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
40 document are to be interpreted as described in RFC 2119 [RFC2119].
42 Status of This Memo
44 This Internet-Draft is submitted in full conformance with the
45 provisions of BCP 78 and BCP 79.
47 Internet-Drafts are working documents of the Internet Engineering
48 Task Force (IETF). Note that other groups may also distribute
49 working documents as Internet-Drafts. The list of current Internet-
50 Drafts is at https://datatracker.ietf.org/drafts/current/.
52 Internet-Drafts are draft documents valid for a maximum of six months
53 and may be updated, replaced, or obsoleted by other documents at any
54 time. It is inappropriate to use Internet-Drafts as reference
55 material or to cite them other than as "work in progress."
57 This Internet-Draft will expire on October 25, 2020.
59 Copyright Notice
61 Copyright (c) 2020 IETF Trust and the persons identified as the
62 document authors. All rights reserved.
64 This document is subject to BCP 78 and the IETF Trust's Legal
65 Provisions Relating to IETF Documents
66 (https://trustee.ietf.org/license-info) in effect on the date of
67 publication of this document. Please review these documents
68 carefully, as they describe your rights and restrictions with respect
69 to this document. Code Components extracted from this document must
70 include Simplified BSD License text as described in Section 4.e of
71 the Trust Legal Provisions and are provided without warranty as
72 described in the Simplified BSD License.
74 Table of Contents
76 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
77 2. Terminologies . . . . . . . . . . . . . . . . . . . . . . . . 3
78 3. Network Slice Mapping Structure . . . . . . . . . . . . . . . 4
79 3.1. Requirements Profile . . . . . . . . . . . . . . . . . . 5
80 3.2. Identifiers . . . . . . . . . . . . . . . . . . . . . . . 6
81 3.3. Relevant functions . . . . . . . . . . . . . . . . . . . 6
82 4. Network Slice Mapping Procedure . . . . . . . . . . . . . . . 7
83 4.1. Network Slice Mapping in Management Plane . . . . . . . . 8
84 4.2. Network Slice Mapping in Control Plane . . . . . . . . . 9
85 4.3. Network Slice Mapping in data plane . . . . . . . . . . . 9
86 4.3.1. Data Plane Mapping Considerations . . . . . . . . . . 10
87 4.3.2. Data Plane Mapping Design . . . . . . . . . . . . . . 10
88 5. Network Slice Mapping Summary . . . . . . . . . . . . . . . . 14
89 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 15
90 7. Security Considerations . . . . . . . . . . . . . . . . . . . 15
91 8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 15
92 9. Normative References . . . . . . . . . . . . . . . . . . . . 15
93 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 16
95 1. Introduction
97 Driven by the new applications of 5G, the concept of network slicing
98 is defined to provide a logical network with specific capabilities
99 and characteristics. Network slice contains a set of network
100 functions and allocated resources(e.g. Computation, storage and
101 network resources). According to [TS28530], a 5G end-to-end network
102 slice is composed of three major types network segments: Radio Access
103 Network (RAN), Transport Network (TN) and Mobile Core Network (CN).
104 Transport network is supposed to provide the required connectivity
105 between AN and CN, which specific performance commitment. For each
106 end-to-end network slice, the topology and performance requirement
107 for transport network can be very different, which requires transport
108 network to have the capability of supporting multiple different
109 transport network slices.
111 A transport network slice is a virtual (logical) network with a
112 particular network topology and a set of shared or dedicated network
113 resources, which are used to provide the network slice consumer with
114 the required connectivity, appropriate isolation and specific Service
115 Level Agreement (SLA). A transport network slice could span multiple
116 technology (IP, Optical) and multiple administrative domains.
117 Depending on the consumer's requirement, a transport network slice
118 could be isolated from other concurrent transport network slices, in
119 terms of data plane, control plane and management plane. Transport
120 network slice is being defined and discussed in IETF.
122 Editor's Note: The work of
124 The procedure of end-to-end network slice instance creation, network
125 slice subnet instance creation and network slice instance termination
126 in management plane are defined in [TS28531]. The end-to-end network
127 slice allocation is defined in ETSI [ZSM003]. But there is no
128 specifications about how to map end-to-end network slice in 5G system
129 to transport network slice. This draft describes the procedure of
130 mapping 5G end-to-end network slice into transport network slice in
131 management plane, control plane and user plane.
133 2. Terminologies
135 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
136 "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
137 document are to be interpreted as described in [RFC2119].
139 The following terms are used in this document:
141 NS: Network Slice
142 NSI: Network Slice Instance
144 NSSI: Network Slice Subnet Instance
146 NSSAI: Network Slice Selection Assistance Information
148 S-NSSAI: Single Network Slice Selection Assistance Information
150 AN: Access Network
152 RAN: Radio Access Network
154 TN: Transport Network
156 CN: Mobile Core Network
158 DSCP: Differentiated Services Code Point
160 CSMF: Communication Service Management Function
162 NSMF: Network Slice Management Function
164 NSSMF: Network Slice Subnet Management Function
166 GST: General Slice Template
168 TNSII: Transport Network Slice Interworking Identifier
170 TNSI: Transport Network Slice Identifier
172 PDU: Protocol Data Unit
174 Editor's Note: Terminologies defined in 3GPP, e.g.,Network Slice
175 Subnet Management Function(NSSMF), Network Slice Subnet
176 Instance(NSSI) and Network Slice Selection Assistance
177 Information(NSSAI), is used in the end-to-end network slice mapping,
178 which may not be used necessarily within the transport network.
180 3. Network Slice Mapping Structure
182 The following figure shows the necessary elements for mapping end-to-
183 end network slice into transport network slice. All these network
184 slice elements are classified into three groups: requirements/
185 capabilities, identifiers and relevant functions.
187 +-----------------+
188 | CSMF |
189 +--------+--------+
190 |
191 +--------V--------+
192 | NSMF |
193 +-----------------+
194 +----------| NSI Identifier |----------+
195 | | Service Profile | |
196 | | TN Network- | |
197 | | -Slice Profile | |
198 | +-----------------+ |
199 | | |
200 +------V------+ +----------V----------+ +------V------+
201 | AN NSSMF | | TN NSSMF | | CN NSSMF |
202 +-------------+ +---------------------+ +-------------+
203 | AN-NSSI- | | TN-NSSI Identifier | | CN-NSSI- |
204 | -Identifier | | Function Management| | -Identifier |
205 | ... | | ... | | ... | Management
206 +-------------+ +---------------------+ +-------------+ Plane
207 | | | | -----------------
208 |<----------PDU session (S-NSSAI)---------->| Control
209 | | | | Plane
210 V V V V -----------------
211 /\ +-----+ +-----+ +-------+ Data
212 /AN\ -----| PE |-----...-----| PE |----| UPF | Plane
213 /____\ +-----+ +-----+ +-------+
214 |-->TNSII<--|------>TNSI<-------|-->TNSII<--|
216 3.1. Requirements Profile
218 In order to satisfy a tenant's request for a network slice with
219 certain characteristics, creating a new network slice or using
220 existing network slice instance is constrained by the customer's
221 requirement and the capability of the network slices.
223 o Service Profile: represents the properties of network slice
224 related requirement that should be supported by the network slice
225 instance in 5G network. Service profile is defined in [TS28541]
226 6.3.3.
228 o TN Network Slice Profile: represents the properties of transport
229 network slice related requirement that should be supported by the
230 transport network slice in a 5G network. Slice Profile is defined
231 in [TS28541] 6.3.4. TN Network slice profile is newly defined in
232 this draft.
234 3.2. Identifiers
236 Network slice related identifiers in management plane, control plane
237 and user(data) plane play an important role in end-to-end network
238 slice mapping.
240 o Single Network Slice Selection Assistance Information(S-NSSAI):
241 end-to-end network slice identifier in control plane, which is
242 defined in [TS23501];
244 o Network Slice Instance(NSI) Identifier:end-to-end network slice
245 identifier in management plane, which is created in NSMF; NSI is
246 is set of Network Function instances and the required resources
247 (e.g. compute, storage and networking resources) which form a
248 deployed Network Slice, which is defined in [TS23501]; ;
250 o Transport Network Slice Instance(TN-NSSI) Identifier: transport
251 network slice identifier in management plane, which is created in
252 TN NSSMF; TN-NSSI is newly defined in this draft.
254 o Transport Network Slice Interworking Identifier (TNSII): network
255 slice identifier which is used for mapping end-to-end network
256 slice into transport network slice in user plane. TNSII is newly
257 defined in this draft.
259 o Transport Network Slice Identifier(TNSI): transport network slice
260 identifier in data plane(user plane). TNSI is newly defined in
261 this draft.
263 The relationship between these identifiers are specifies in the
264 following sections.
266 3.3. Relevant functions
268 There are a set of slice relevant functions that are necessary for
269 transport network slice management:
271 o Topology management
273 o QoS management
275 o Resource management
277 o Measurement management
279 o ...
281 Some of these functions are implemented inside the transport network
282 and independent from the end-to-end network slice, e.g., topology
283 management, QoS management, resource management; Some of the
284 functions are related to the end-to-end network slice and should
285 cooperate with other network elements from other domain, e.g.,
286 Measurement management.
288 4. Network Slice Mapping Procedure
290 This section provides a general procedure of network slice mapping:
292 +--------------------------------+
293 | Requirement Matching |
294 +---------------+----------------+
295 |
296 V
297 +--------------------------------+
298 | NSI<->TN NSSI Mapping |
299 +---------------+----------------+
300 |
301 V
302 +--------------------------------+
303 | S-NSSAI Selection |
304 +---------------+----------------+
305 |
306 V
307 +--------------------------------+
308 |S-NSSAI<---------->TNSII Mapping|
309 | (NSI<->TN NSSI) |
310 +---------------+----------------+
311 |
312 V
313 +--------------------------------+
314 | TNSII<->TNSI Mapping |
315 +--------------------------------+
317 1. NSMF receives the request from CSMF for allocation of a network
318 slice instance with certain characteristics.
320 2. Based on the service requirement , NSMF acquires requirements for
321 the end-to-end network slice instance , which is defined in Service
322 Profile([TS28541] section 6.3.3).
324 3. NSMF derives transport network slice related requirements from
325 the Service profile, and maintains them in Transport Network Slice
326 Profile, So as to CN Slice Profile and AN Slice Profile, in order to
327 decide on the constituent NSSIs(including AN NSSI, CN NSSI and TN
328 NSSI) of the NSI, based on the service profile and the endpoint
329 information(AN/CN edge nodes).
331 4. NSMF sends the Transport Network Slice Profile to TN NSSMF for TN
332 NSSI allocation.
334 5. TN NSSMF allocates TN NSSI which could satisfy the requirement of
335 Transport Network Slice Profile between the specified endpoints (AN/
336 CN edge nodes) and sends the TN NSSI Identifier to NSMF.
338 6. NSMF acquires the mapping relationship between NSI and TN NSSI.
340 7. NSMF matains the mapping relationship between NSI and S-NSSAI and
341 the mapping relationship between TN NSSI and TNSII, which could be
342 used to set up mapping relationship between S-NSSAI and TNSII.
344 8. When a PDU session is set up between AN and CN, an S-NSSAI is
345 slected for the PDU session.
347 9. AN/CN edge nodes encapsulate the packet using TNSII, according to
348 the selected S-NSSAI. Network Slice could also be differentiated by
349 physical interface, if different network slices are transported
350 through different interface;
352 10. The edge node of transport network parses the TNSII from the
353 packet and maps the packet to the corresponding transport network
354 slice. It may encapsulate packet with TNSI. The nodes in transport
355 network transit the packet inside the corresponding transport network
356 slice according to TNSI.
358 The procedure of end-to-end network slice mapping involves the
359 mapping in three network planes: management plane, control plane and
360 data plane.
362 4.1. Network Slice Mapping in Management Plane
364 The transport network management Plane maintains the interface
365 between NSMF and TN NSSMF, which 1) guarantees that transport network
366 slice could connect the AN and CN with specified characteristics that
367 satisfy the requirements of communication; 2) builds up the mapping
368 relationship between NSI identifier and TN NSSI identifier; 3)
369 maintains the end-to-end slice relevant functions;
371 Service Profile defined in[TS28541] represents the requirement of
372 end-to-end network slice instance in 5G network. Parameters defined
373 in Service Profile include Latency, resource sharing level,
374 availability and so on. How to decompose the end-to-end requirement
375 to the transport network requirement is one of the key issues in
376 Network slice requirement mapping. GSMA(Global System for Mobile
377 Communications Association) defines the [GST] to indicate the network
378 slice requirement from the view of service provider.
379 [I-D.contreras-teas-slice-nbi] analysis the parameters of GST and
380 categorize the parameters into three classes, including the
381 attributes with direct impact on the transport network slice
382 definition. It is a good start for selecting the transport network
383 relevant parameters in order to define Network Slice Profile for
384 Transport Network. Network slice requirement parameters are also
385 necessary for the definition of transport network northbound
386 interface.
388 Inside the TN NSSMF, it is supposed to maintain the attributes of the
389 transport network slice. If the attributes of an existing TN NSSI
390 could satisfy the requirement from TN Network Slice Profile, the
391 existing TN NSSI could be selected and the mapping is finished If
392 there is no existing TN NSSI which could satisfy the requirement, a
393 new TN NSSI is supposed to be created by the NSSMF with new
394 attributes.
396 TN NSSI resource reservation should be considered to avoid over
397 allocation from multiple requests from NSMF (but the detailed
398 mechanism should be out of scope in the draft)
400 TN NSSMF sends the selected or newly allocated TN NSSI identifier to
401 NSMF. The mapping relationship between NSI identifier and TN NSSI
402 identifier is maintained in both NSMF and TN NSSMF.
404 4.2. Network Slice Mapping in Control Plane
406 There is no explicit interaction between transport network and AN/CN
407 in the control plane, but the S-NSSAI defined in [TS23501] is treated
408 as the end-to-end network slice identifier in the control plane of AN
409 and CN, which is used in UE registration and PDU session setup. In
410 this draft, we assume that there is mapping relationship between
411 S-NSSAI and NSI in the management plane, thus it could be mapped to a
412 transport network slice .
414 Editor's note: The mapping relationship between NSI defined in
415 [TS23501] and S-NSSAI defined in [TS23501] is still in discussion.
417 4.3. Network Slice Mapping in data plane
419 If multiple network slices are carried through one physical interface
420 between AN/CN and TN, transport network slice interworking
421 identifier(TNSII) in the data plane needs to be introduced. If
422 different network slices are transported through different physical
423 interfaces, Network Slices could be distinguished by the interface
424 directly. Thus TNSII is not the only option for network slice
425 mapping, while it may help in introducing new network slices.
427 4.3.1. Data Plane Mapping Considerations
429 The mapping relationship between AN or CN network slice identifier
430 (either S-NSSAI in control plane or NSI/NSSI in management plane) and
431 TNSII needs to be maintained in AN/CN network nodes, and the mapping
432 relationship between TNSII and TNSI is maintained in the edge node of
433 transport network. When the packet of a uplink flow goes from AN to
434 TN, the packet is encapsulated based on the TNSII; then the
435 encapsulation of TNSII is read by the edge node of transport network,
436 which maps the packet to the corresponding transport network slice.
438 Editor's Note: We have considered to add "Network Instance" defined
439 in [TS23501]in the draft. However, after the discussion with 3GPP
440 people, we think the concept of "network instance" is a 'neither
441 Necessary nor Sufficient Condition' for network slice. Network
442 Instance could be determined by S-NSSAI, it could also depends on
443 other information; Network slice could also be allocated without
444 network instance (in my understanding) And, TNSII is not a
445 competitive concept with network instance.TNSII is a concept for the
446 data plane interconnection with transport network, network instance
447 may be used by AN and CN nodes to associate a network slice with
448 TNSII
450 4.3.2. Data Plane Mapping Design
452 The following picture shows the end-to-end network slice in data
453 plane:
455 +--+ +-----+ +----------------+
456 |UE|- - - -|(R)AN|---------------------------| UPF |
457 +--+ +-----+ +----------------+
458 |<----AN NS---->|<----------TN NS---------->|<----CN NS----->|
460 The mapping between 3GPP slice and transport slice in user plane
461 could happens in:
463 (R)AN: User data goes from (radio) access network to transport
464 network
466 UPF: User data goes from core network functions to transport network
468 Editor's Note: As figure 4.7.1. in [TS28530] describes, TN NS will
469 not only exist between AN and CN but may also within AN NS and CN NS.
471 However, here we just show the TN between AN and CN as an example to
472 avoid unncessary complexity.
474 The following picture shows the user plane protocol stack in end-to-
475 end 5G system.
477 +-----------+ | | |
478 |Application+--------------------|------------------|---------------|
479 +-----------+ | | +-----------+ |
480 | PDU Layer +--------------------|------------------|-| PDU Layer | |
481 +-----------+ +-------------+ | +-------------+ | +-----------+ |
482 | | | ___Relay___ |--|--| ___Relay___ |-|-| | |
483 | | | \/ GTP-U|--|--|GTP-U\/ GTP-U|-|-| GTP-U | |
484 | 5G-AN | |5G-AN +------+ | +------+------+ | +-----------+ |
485 | Protocol | |Protoc|UDP/IP|--|--|UDP/IP|UDP/IP|-|-| UDP/IP | |
486 | Layers | |Layers+------+ | +------+------+ | +-----------+ |
487 | | | | L2 |--|--| L2 | L2 |-|-| L2 | |
488 | | | +------+ | +------+------+ | +-----------+ |
489 | | | | L1 |--|--| L1 | L1 |-|-| L1 | |
490 +-----------+ +-------------+ | +-------------+ | +-----------+ |
491 UE 5G-AN | UPF | UPF |
492 N3 N9 N6
494 The following figure shows the typical encapsulation in N3 interface
495 which could be used to carry the transport network slice interworking
496 identifier (TNSII) between AN/CN and TN.
498 +------------------------+
499 | Application Protocols |
500 +------------------------+
501 | IP (User) |
502 +------------------------+
503 | GTP |
504 +------------------------+
505 | UDP |
506 +------------------------+
507 | IP |
508 +------------------------+
509 | Ethernet |
510 +------------------------+
512 4.3.2.1. Layer 3 and Layer 2 Encapsulations
514 If the encapsulation above IP layer is not visible to Transport
515 Network, it is not able to be used for network slice interworking
516 with transport network. In this case, IP header and Ethernet header
517 could be considered to provide information of network slice
518 interworking from AN or CN to TN.
520 +------------------------+-----------
521 | Application Protocols | ^
522 +------------------------+ |
523 | IP (User) | Invisible
524 +------------------------+ for
525 | GTP | TN
526 +------------------------+ |
527 | UDP | V
528 +------------------------+------------
529 | IP |
530 +------------------------+
531 | Ethernet |
532 +------------------------+
534 The following field in IP header and Ethernet header could be
535 considered :
537 IP Header:
539 o DSCP: It is traditionally used for the mapping of QoS identifier
540 between AN/CN and TN network. Although some values (e.g. The
541 unassigned code points) may be borrowed for the network slice
542 interworking, it may cause confusion between QoS mapping and
543 network slicing mapping.;
545 o Destination Address: It is possible to allocate different IP
546 addresses for entities in different network slice, then the
547 destination IP address could be used as the network slice
548 interworking identifier. However, it brings additional
549 requirement to IP address planning. In addition, in some cases
550 some AN or CN network slices may use duplicated IP addresses.
552 o Option fields/headers: It requires that both AN and CN nodes can
553 support the encapsulation and decapsulation of the options.
555 Ethernet header
557 o VLAN ID: It is widely used for the interconnection between AN/CN
558 nodes and the edge nodes of transport network for the access to
559 different VPNs. One possible problem is that the number of VLAN
560 ID can be supported by AN nodes is typically limited, which
561 effects the number of transport network slices a AN node can
562 attach to. Another problem is the total amount of VLAN ID (4K)
563 may not provide a comparable space as the network slice
564 identifiers of mobile networks.
566 Two or more options described above may also be used together as the
567 TNSII, while it would make the mapping relationship more complex to
568 maintain.
570 In some other case, when AN or CN could support more layer 3
571 encapsulations, more options are available as follows:
573 If the AN or CN could support MPLS, the protocol stack could be as
574 follows:
576 +------------------------+-----------
577 | Application Protocols | ^
578 +------------------------+ |
579 | IP (User) | Invisible
580 +------------------------+ for
581 | GTP | TN
582 +------------------------+ |
583 | UDP | V
584 +------------------------+------------
585 | MPLS |
586 +------------------------+
587 | IP |
588 +------------------------+
589 | Ethernet |
590 +------------------------+
592 A specified MPLS label could be used to as a TNSII.
594 If the AN or CN could support SRv6, the protocol stack is as follows:
596 +------------------------+-----------
597 | Application Protocols | ^
598 +------------------------+ |
599 | IP (User) | Invisible
600 +------------------------+ for
601 | GTP | TN
602 +------------------------+ |
603 | UDP | V
604 +------------------------+------------
605 | SRH |
606 +------------------------+
607 | IPv6 |
608 +------------------------+
609 | Ethernet |
610 +------------------------+
612 The following field could be considered to identify a network slice:
614 SRH:
616 o SRv6 functions: AN/CN is supposed to support the new function
617 extension of SRv6.
619 o Optional TLV: AN/CN is supposed to support the extension of
620 optional TLV of SRH.
622 4.3.2.2. Above Layer 3 Encapsulations
624 If the encapsulation above IP layer is visible to Transport Network,
625 it is able to be used to identify a network slice. In this case, UPD
626 and GTP-U could be considered to provide information of network slice
627 interworking between AN or CN and TN.
629 +------------------------+----------
630 | Application Protocols | |
631 +------------------------+ Invisible
632 | IP (User) | for
633 +------------------------+ TN
634 | GTP | |
635 +------------------------+------------
636 | UDP |
637 +------------------------+
638 | IP |
639 +------------------------+
640 | Ethernet |
641 +------------------------+
643 The following field in UDP header could be considered:
645 UDP Header:
647 o UDP Source port: The UDP source port is sometimes used for load
648 balancing. Using it for network slice mapping would require to
649 disable the load-balancing behavior.
651 5. Network Slice Mapping Summary
653 The following picture shows the mapping relationship between the
654 network slice identifier in management plane, control plane and user
655 plane.
657 AN/CN | TN
658 Management +---------+ | +---------+
659 Plane | NSI |<--------|------->| TN NSSI |
660 +---------+ | +---------+
661 | | |
662 | | |
663 Control +-----V-----+ | +----------+----------+
664 Plane | S-NSSAI | | | |
665 +-----------+ | | |
666 | +----V----+ +----V----+
667 +----------->| TNSII |<--------->| TNSI |
668 User | /Port |<--------->| |
669 Plane +---------+ +---------+
670 |
672 6. IANA Considerations
674 TBD
676 Note to RFC Editor: this section may be removed on publication as an
677 RFC.
679 7. Security Considerations
681 TBD
683 8. Acknowledgements
685 The authors would like to thank Shunsuke Homma for reviewing the
686 draft and giving valuable comments.
688 9. Normative References
690 [GST] "Generic Network Slice Template",
691 .
694 [I-D.contreras-teas-slice-nbi]
695 Contreras, L., Homma, S., and J. Ordonez-Lucena,
696 "Considerations for defining a Transport Slice NBI",
697 draft-contreras-teas-slice-nbi-01 (work in progress),
698 March 2020.
700 [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
701 Requirement Levels", BCP 14, RFC 2119,
702 DOI 10.17487/RFC2119, March 1997,
703 .
705 [TS23501] "3GPP TS23.501",
706 .
709 [TS28530] "3GPP TS28.530",
710 .
713 [TS28531] "3GPP TS28.531",
714 .
717 [TS28541] "3GPP TS 28.541",
718 .
721 [ZSM003] "ETSI ZSM003",
722 .
725 Authors' Addresses
727 Xuesong Geng
728 Huawei Technologies
730 Email: gengxuesong@huawei.com
732 Jie Dong
733 Huawei Technologies
735 Email: jie.dong@huawei.com
737 Ran Pang
738 China Unicom
740 Email: pangran@chinaunicom.cn
742 Liuyan Han
743 China Mobile
745 Email: hanliuyan@chinamobile.com
746 Tomonobu Niwa
747 KDDI
749 Email: to-niwa@kddi.com
751 Jaehwan Jin
752 LG U+
754 Email: daenamu1@lguplus.co.kr
756 Chang Liu
757 China Unicom
759 Email: liuc131@chinaunicom.cn
761 Nikesh Nageshar
762 Individual
764 Email: nikesh.nageshar@gmail.com