Suppo ing QoE/QoS-awa e end- o-end ne wo k slicing in u u e
5G-enabled op ical ne wo ks
Ra ael Mon e o, Albe Pagès, Fe nando Ag az, Sal a o e Spada o
Op ical Communica ions G oup, Uni e si a Poli ècnica de Ca alunya (UPC), Ba celona, Spain
ABSTRACT
Ne wo k slicing wi h Quali y o Expe ience/Quali y o Se ice (QoE/QoS) gua an ees is seen as one o he key enable s
o u u e 5G ne wo ks. Ne e heless, i poses se e al challenges in bo h esou ce p o isioning and managemen ha
need o be add essed o he e icien end- o-end se ice deli e y. In pa icula , ne wo k slice deploymen s conside ing
ope a ion ac oss se e al domains and ne wo k segmen s, equi e o in e -domain con igu a ions, con inuous moni o ing,
po en ial ac ua ions, in e -slice isola ion, among o he , in o de o be p o isioned and main ained, looking o wa d o
gua an eeing hei assu ed Key Pe o mance Indica o s (KPIs). In such scena io, op ical ne wo ks a e o p ime
impo ance, enabling he in e -connec i i y be ween mul iple a away segmen s and Poin s o P esence (PoPs). In ligh
o his, in his pape we p esen an a chi ec u e design enabling ne wo k slice p o isioning o 5G se ice chaining in
mul i-segmen /mul i-domain op ical ne wo k scena ios. The p esen ed design is en iched wi h a policy-based moni o ing
and ac ua ion amewo k able o main ain he desi ed QoS o he p o isioned end- o-end (E2E) ne wo k slice. We
expe imen ally alida ed he p oposal agains eal slice deploymen s and a ic gene a ion, p o iding a p oo o concep
o he p esen ed a chi ec u e, wi h special emphasis in he demons a ion o he ac ua ion amewo k as a key elemen
o quali y gua an ees.
Keywo ds: 5G, Ne wo k Slicing, Se ice Chaining, QoS Senso s and Ac ua o s, Da a Cen e s, Op ical Ne wo ks
1. INTRODUCTION
As elecom and ne wo k in as uc u es mo e owa ds he 5 h Gene a ion (5G) o mobile ne wo ks, new challenges
appea on he a ena in o de o e icien ly p o ision se ices o e he sha ed ne wo k in as uc u e. No only u u e 5G
ne wo ks will ha e o wi hs and subs an ially inc eased peak and a e age bi - a es pe single use , inc eased use densi y
and olume as well as educed E2E la encies1, bu also will need o suppo high le els o cus omiza ion and lexibili y
o cope wi h he equi emen s o key s akeholde s o he economic ac i i y (e.g., eHeal h, Au omo i e, Indus y 4.0,
Ene gy, e c.). Indeed, hese 5G e ical cus ome s de ine e y speci ic equi emen s which ha e o be accommoda ed
independen ly o e he sha ed unde lying in as uc u e, p o iding also he means o cus omiza ion and se ice
isola ion. In his ega d, se ices in 5G a e b oadly ca ego ized in enhanced mobile b oadband (eMBB), ul a- eliable
and low la ency communica ions (URLLC) and massi e machine- ype communica ions (mMTC) se ice ypes, each o
hem imposing di e en KPI equi emen s. As a esul , u u e ne wo k scena ios need o de ine solu ions o e icien ly
cope wi h mul i- enancy in a g ace ul way.
Ne wo k slicing and, hus, ne wo k slices (NSes) ha e been iden i ied as he enabling echnology o e icien se ice
deli e y in u u e 5G ne wo ks2. In essence, NSes le e age on o he Ne wo k as a Se ice (NaaS) pa adigm, in which a
common ne wo k in as uc u e can be le e aged by di e en e icals, pa i ioning he in as uc u e in sel -con ained
logical ne wo ks cus omized o he se ice o be deli e ed on op. In such a p ocess, esou ce i ualiza ion, ei he
ne wo k o compu ing, becomes p imo dial. Thanks o i ualiza ion, abs ac ep esen a ions o physical esou ces can
be ob ained and hen composed in uni ied logical ins ances (i.e. he NSes). Such i ualiza ion becomes he ounda ion
o slice cus omiza ion, as each i ual elemen can be speci ically ailo ed o i he needs o he slice. Fu he mo e,
i ualiza ion also enables he possibili y o no only o e esou ces o compose he slice, bu also Vi ual Func ions
(VFs), ha implemen speci ic p ocesses, such as a ic shaping, ideo encoding, i ewalling, o name some, ha en ich
he p o isioned NSes.
So wa e De ined Ne wo king (SDN) and Ne wo k Func ion Vi ualiza ion (NFV) a e he key enable s o ne wo k
slicing in 5G3. On he one hand, SDN enables he abs ac ion o ne wo k esou ces, p o iding g anula con ol o
consume s. Abs ac ed esou ces can hen be easily con igu ed and moni o ed so changes in he ne wo k can be igge ed
when equi ed. A i s u n, NFV pa adigm allows o he c ea ion and deploymen o Vi ual Ne wo k Func ions (NFV),
which encapsula e speci ic ne wo king o applica ion unc ions, o p o ide speci ic la o s o NSes cus omiza ion. This
is achie ed hanks o he chaining o mul iple VNF ins ances, in e connec ed h ough con igu ed da a pa hs in bo h
i ual and physical ne wo k in as uc u es.
In end- o-end scena ios, NSes will span di e en segmen s and echnological domains ( adio, wi ed access, co e,
anspo ), wi h NFV PoPs (e.g., da a cen e s (DCs), Mobile Edge Compu ing (MEC)) dis ibu ed ac oss o suppo he
deploymen o cus om unc ions. Seeing his, op ical ne wo ks and hei i ualiza ion a e en e ained o be pa o he
E2E NS deli e y, in e connec ing a apa ne wo k segmen s o cons i u ing he in e nal ab ic o PoPs o enable high
speed, high pe o mance and low la ency communica ions ac oss he endpoin s o he slices. Fo his eason,
a chi ec u es and echniques o p o ision NSes in NFV-based op ical ne wo ks a e a mus and cu en ly being hea ily
in es iga ed4. On ano he hand, one o he key aspec s in 5G ne wo k slicing ela es o he deli e y and main enance o
QoS/QoE gua an ees o he p o isioned NSes. Indeed, quali y main enance is a daun ing challenge ha in ol es se e al
aspec s, anging om slice/se ice moni o ing o de ec luc ua ions on he quali y o changes in he equi emen s, o e-
con igu a ion/scaling ope a ions (ac ua ions) o modi y he p o isioned esou ces o suppo he desi ed quali y le els. In
ligh o his, p ope solu ions o add ess such challenges mus also be ound.
Taking all o his in o conside a ion, in his pape we ocus on achie ing he E2E p o isioning and QoS main enance o
NSes in a mul i-segmen /mul i-domain op ically-in e connec ed ne wo k scena io. To his end, we p opose a design o
an a chi ec u e capable o handling deploymen s, moni o ing and ac ua ions o e he unde lying segmen s o he ne wo k
and he mul iple NFV PoPs, wi h aims o au oma e he NSes deploymen and quali y assu ance. Then, he p oposed
a chi ec u e is expe imen ally e alua ed o assess he ull deploymen -moni o ing-ac ua ion cycle. The emainde o his
pape con inues as ollows. Sec ion 2 u he elabo a es on he design p inciples ha enable slice composi ion,
moni o ing and ac ua ion, pawing he pa h o he ac ual a chi ec u al p oposal. Then, Sec ion 3 p esen s he o e all E2E
a chi ec u e including he componen s in oduced in his pape o coo dina e he NSes p o isioning while gua an eeing
hei QoS ag eemen s. Nex , Sec ion 4 p esen s he esul s in ega ds o he a chi ec u e e alua ion. Finally, Sec ion 5
summa izes he key achie emen s and conclusions o he pape .
2. END-TO-END NETWORK SLICE PROVISIONING AND MAINTENANCE
As in oduced in he p e ious sec ion, deploying and main aining an end- o-end (E2E) NS equi es coo dina ion ac oss
ne wo k segmen s in bo h p o isioning and un ime phases as well as a con ol and managemen s ack o enable dynamic
con igu a ion and moni o ing o he p o isioned esou ces, hus being able o con ol he quali y o he deployed NSes.
Gene ally speaking, a NS is composed by a se o VNF ins ances in e connec ed wi h each o he (wha is known as he
se ice chain), wi h he equi ed i ual in as uc u e (ne wo k and compu ing) o suppo he se ices ha will un on
op. Then, i is up o he managemen and con ol in as uc u e o he mul iple segmen s in ol ed in he deploymen o
ac ually con igu e and moni o he esou ces o be able o deli e he E2E NS.
Figu e 1. Schema ic o MAPE-loop-based a chi ec u e o E2E slice con ol and managemen
To enable a holis ic managemen , con ol and moni o ing o he slices, an o e lay coo dina ion/managemen en i y
spanning he mul iple in ol ed segmen s is usually employed5. Such an en i y is esponsible o agglu ina e all E2E
con ol and managemen unc ions, dis ibu ing indi idual esponsibili ies o he in ol ed segmen s once a p ope
esou ce layou has been de e mined o he NS o be deployed. Mo eo e , such an en i y is also he esponsible o
collec moni o ing in o ma ion om he di e en segmen s o be able o cons uc highe le el moni o ing in o ma ion o
he E2E slice. Then, a e analyzing he moni o ing da a, se e al e-con igu a ions o he NS may be igge ed h ough an
ac ua ion sys em o e eaching he se e al segmen s in o de o main ain desi ed QoS le els. Such loop is known as he
Moni o ing, Analysis, Planning and Execu ion (MAPE) loop and has become he ounda ion o au onomous and sel -
op imized ne wo ks (SONs). Figu e 1 depic s a schema ic o he loop, highligh ing he main ac o s and in e ac ions as
well as he possible le els o moni o ing.
Ou a chi ec u e p oposal ollows such app oach, le e aging on he capabili ies o he mul iple indi idual componen s o
deli e a uni ied pla o m o close he ull loop. The ollowing sub-sec ions u he elabo a e on he main p inciples
necessa y o E2E slice p o isioning wi h QoS gua an ees, which a e hen adop ed in he a chi ec u e p esen ed in
Sec ion III.
2.1 Ne wo k Slices Composi ion
One o he main challenges when deli e ing an E2E slice ela es o he slice composi ion, ha is, how he slice o suppo
he wan ed se ice is c ea ed and hen pa i ioned in smalle slices o be deployed in he se e al segmen s. The Slice
Composi ion concep (i.e., “slice-cum-slice”) in oduced by he 5G-PPP1 en ails building a slice ou o indi idual slices.
In p inciple, di e en segmen s/domains could p o ide speci ic unc ionali ies, hen i would be possible o compose a
slice by indi idually con igu ing pa s o he E2E ne wo k in as uc u e. As a esul , a slice would be c ea ed om a
join se o unc ions, which a e dis ibu ed ac oss he se e al segmen s. Fu he mo e, a slice could also be ex ended by
con igu ing addi ional unc ions and agg ega ing hem o he slice.
Mo e in pa icula , a NS Ins ance (NSI) hen, would be ins an ia ed by combining a se o NS Subne Ins ances (NSSI) 6.
Gene ally speaking, each NSSI could belong o a di e en domain and be con igu ed on a di e en ne wo k segmen . A
coo dina ing en i y in such case would be equi ed, so each NSSI is ins an ia ed a he co esponding segmen and in e -
NSSI communica ion is also p ope ly con igu ed. Such le el o slice composi ion would enable E2E slices o be buil by
p o isioning and combining a numbe o NSSIs ac oss all equi ed ne wo k segmen s. Addi ionally, se ice-chaining
ela ed implemen a ions could also make use o his echnique as hey may equi e unc ionali ies o be p esen in
di e en pa s o he ne wo k. Finally, his echnique could also help in accommoda e NS deploymen s which
unc ionali ies o demanded esou ces a e no a ailable in a single segmen /domain.
2.2 Moni o ing and Senso s
Conside ing he main enance o he NS, i becomes c ucial o keep up- o-da e moni o ing in o ma ion o he unde lying
ne wo k and compu ing esou ces. Ne wo k senso s in u n, allow ga he ing speci ic moni o ing QoS pa ame e s om
he ne wo k, so hese can be u he ly agg ega ed o he NS le el and p ocessed. A senso could be conside ed in many
o ms (e.g., Vi ual Machine (VM), VNF, applica ion) and be p esen a di e en le els o he a chi ec u e (i.e.,
in as uc u e laye , con ol laye , o ches a ion laye ). Mo eo e , some senso s may be ins an ia ed and con igu ed a he
p o isioning s age while o he s may be deployed on-demand du ing un ime. In his ega d, such unc ional lexibili y o
senso s will help in he main enance o a NS by pu ing emphasis only on moni o ing speci ic ne wo k pa ame e s ela ed
o gua an eeing i s assu ed KPIs.
2.3 Policy-based Ac ua ion
A e he collec ion and p ocessing o moni o ing da a, ei he by using p edic i e o p e en i e echniques, and upon he
possibili y o he slice QoS o being comp omised, ac ions (i.e. ( e-)con igu a ions) may be igge ed o accommoda e
he slice o he cu en s a e o he ne wo k, hus s ill gua an eeing i s equi ed QoS. As in he case o he senso s, ac ions
could be p esen in o m o con igu a ions a di e en le els o he a chi ec u e o may e en conside deploymen s o a
componen (e.g., VM, VNF, applica ion, senso ).
One popula app oach o he ac ua ion amewo k ela es o he adop ion o a policy-based ac ua ion sys em, in which a
policy amewo k c ea es policies ied o speci ic beha io s in ega ds o con igu a ions needed a di e en le els o he
whole in as uc u e. Then, hese policies a e dis ibu ed ac oss he mul iple decision poin s, which a e he esponsible o
de e mine when a policy has o be applied o no . A policy, hus, has o de ine unde which condi ions is ac i a ed and
wha a e he esul ing ou comes o applying he policy (i.e. he ac ions/con igu a ions). In his ega d, he Simpli ied Use
o Policy Abs ac ions (SUPA) wo king g oup ini ia i e a he IETF de ines an in o ma ion model o ep esen di e en
ypes o ne wo k policies7. A common SUPA model is composed by an e en (e.g., packe d op a io), a condi ion (e.g.,
g ea e han 10%) and an ac ion (e.g. inc ease ne wo k bandwid h), which, in combina ion, dic a e which a e he igge s
o he policies and wha a e he ac ions ha need o be en o ced when he condi ions a e me . Based on his, da a models
can be de ined o se e as an inpu o ne wo k managemen unc ions, possibly esul ing in ne wo k con igu a ion
changes unde se e al condi ions. These models would allow se ing policy ules including commands o be sen
be ween en i ies, as well as se ing o managing and con igu ing de ices and se ices.
2.4 NFV Coo dina o
As a inal p inciple, he wo k p esen ed in his pape ecognizes he need o a componen capable o managing he slice
composi ion while also being able o handling ne wo k senso s and ac ua o s. Such a piece would hen become he cen e
o he whole MAPE loop o E2E NS deli e y wi h QoS gua an ees. As a esul , an NFV Coo dina o (NFV-C) comes o
he pic u e, which would be he esponsible o he ollowing unc ionali ies equi ed o he p o isioning and
main enance o NS:
Coo dina ion ac oss single NFV en i ies o compose and p o ision slices.
In e -domain con igu a ion o enable connec i i y be ween segmen s alloca ing NSSIs.
In e -segmen con igu a ion o allow ou ing/chaining be ween VNFs ac oss di e en NSSIs.
Con igu a ion and deploymen o ne wo k senso s and moni o ing da a collec ion.
P ocessing and analysis o ga he ed moni o ing da a o eed he ac ua ion amewo k.
T igge ing o ac ua ions o gua an ee o e all QoS o he slice.
3. ARCHITECTURE FOR E2E SLICE PROVISIONING
Following he concep s in oduced in p e ious sec ion, Figu e 2 depic s he o e all a chi ec u e p esen ed in his wo k o
mul i-domain slice p o isioning and moni o ing in 5G- eady op ical ne wo ks.
Figu e 2. A chi ec u e o E2E NS deploymen in op ically in e connec ed DCs.
As seen in he igu e, we conside a mul i-segmen scena io wi h op ically in e connec ed DCs h ough a Wide A ea
Ne wo k (WAN), wi h SDN con olle s o con igu e ne wo k elemen s a he in as uc u e laye . Elemen s belonging o
DCs and op ical ne wo k segmen s expose hei unc ionali ies owa ds an SDN con olle (i.e., OpenDayligh (ODL))
ia a sou hbound p o ocol. In u n, he con olle o e s ne wo k con igu abili y o consume s in uppe laye s (e.g.,
o ches a ion, applica ion). An o ches a ion en i y (i.e., OpenS ack) a he DC segmen s is in cha ge o managing
compu a ional esou ces and eques ing he SDN con olle o ne wo k connec i i y. A he WAN segmen , he eques
o ne wo k con igu a ion is elega ed o he NFV-C componen . The NFV-C akes a majo ole in he whole
a chi ec u e, as i no only helps in he p o isioning o slices by pa i ioning hem using he slice composi ion echnique
and eques ing hei alloca ion, bu also allows o hei ongoing moni o ing and policy-based main enance. A mo e in-
dep h cha ac e iza ion o his componen ollows a he analysis o he slice li ecycle s ages. Finally, an NFV
Managemen and O ches a ion (MANO)8 en i y (i.e., Open Sou ce MANO) is also equi ed o manage he p o isioning
o pe -segmen NSSIs, ha is, he deploymen and con igu a ion o VNF ins ances belonging o each NSSI.
3.1 Slice P o isioning Phase
The NFV-C ac s as he s a poin o slice p o isioning. I allows he consume (e.g., a 5G e ical) o eques o a
ne wo k se ice based on a Ne wo k Se ice Desc ip o (NSD). The Slice Manage componen a he NFV-C handles he
eques , de e mines he NSI o be c ea ed and de-composes i in o se e al NSSIs acco ding o se ice and esou ce
a ailabili y a he di e en ne wo k segmen s. A e de ining he NSSIs, he nex s ep is o eques o he MANO
amewo k o hei p o isioning by using indi idual desc ip o s o each o hem and ins uc ing he selec ed segmen
o hei alloca ion. The MANO en i y hen is able o eques o he co esponding DC segmen s ia hei o ches a o s o
p o ision compu a ional (i.e., VMs) and ne wo k esou ces o each NSSI. While hese a e being p o isioned, he NFV-
C will eques he SDN con olle a he WAN segmen o ne wo k connec i i y be ween segmen s, so he Tunnel
Manage can igge he c ea ion o a unnel be ween in ol ed DCs o E2E communica ion ac oss VNFs. Thanks o he
op ical capabili ies, mul iple unnels a e agg ega ed a bo de nodes in high bandwid h op ical communica ions, enabling
o e icien esou ce sha ing ac oss indi idual communica ions o a single NSI spanning mul iple DC segmen s. Once
VMs/VNFs a e ope a i e a bo h ne wo k segmen s, he NFV-C In e ace Manage will be able o e ie e in e ace
in o ma ion a bo h ends and con igu e he in e -segmen ou ing. The In e -Vi ual In as uc u e Manage (VIM)
Manage applica ion a he mul iple SDN con olle s will enable coo dina ion wi h he NFV-C o hese inal
con igu a ions. A e all is se up, VMs belonging o each VNF should be able o each each o he ia he da a ne wo k,
hus comple ing he p o ision s age o he NS.
3.2 Run ime Slice Moni o ing and Ac ua ion Phase
Once he NS has comple ed he p o isioning s age, he Moni o ing Manage a he NFV-C s a s an ongoing moni o ing
ask pa icula ized o he needs o he slice. In pa icula , i con igu es he da a sou ces a he ne wo k segmen s, o
ins ance, h oughpu and packe loss a io o he in a-DC ne wo ks o bi e o a e and Op ical Signal o Noise a io
(OSNR) o he op ical ne wo k segmen s, as well as moni o ing sou ces o he compu a ional esou ces, o example
hei CPU and RAM u iliza ion. As said be o e, hese da a sou ce se e as igge s o he whole ac ua ion amewo k. In
his ega d, he Policy Manage componen enables policy-based ac ions (i.e., ac ua ions) ha will allow main aining he
slice QoS ag eemen s i comp omised le els a e eached. Policies a e ins alled in he Policy F amewo k, ei he hanks o
an au oma ic gene a ion p ocedu e ( o example, based in machine lea ning) o manually on-boa ded by a sys em
adminis a o . These policies hen dic a e when and how ac ua ions should be igge ed acco ding o he da a sou ces o
which hey a e bound o. When applying a policy ha has been igge ed, he NFV-C execu es he equi ed ac ion, which
can esul in econ igu a ions in bo h he compu ing and ne wo k esou ces p o isioned o he E2E slice. As a esul , a
new in as uc u e con igu a ion is deli e ed hus gua an eeing he o e all QoS o he slice.
4. EXPERIMETAL VALIDATION
In his sec ion, we expe imen ally alida e he p oposed a chi ec u e by p o iding a p ac ical example o he whole
moni o ing and policy-based ac ua ion loop. To his end, an emula ed es bed consis ing on 3 ne wo k segmen s (i.e.,
le -DC, WAN, igh -DC), he same as depic ed in Figu e 2, is employed. In ega ds o con ol, each ne wo k segmen is
connec ed o i s own ODL-based SDN con olle , while each DC is managed by a single OpenS ack en i y. An
o e eaching OSM en i y enables he deploymen o NSSIs a pa icula DCs as esul o he slice composi ion
pe o med a he NFV-C elemen . Fo he pa icula es s, a single NS composed o wo VNFs has been deployed,
esul ing in wo NSSIs, each one wi h one VNF, deployed in di e en DCs. Tha is, as a esul o he slice composi ion,
each DC hos s a single VM co esponding o he E2E NS, while ne wo k connec i i y is deli e ed ac oss he 3 in ol ed
ne wo k segmen s. To exe cise he policy-based ac ua ion, we ocus on he case in which QoS o he slice is de e mined
by he packe loss a io expe imen ed by he da a lows ac oss VNFs, which could be he case o ideo deli e y se ices.
To his end, a policy s a ing ha as a esul o a packe loss a io (PLR) g ea e han a p e-de ined h eshold, he
con igu ed slice ne wo k bandwid h has o be inc eased o sui able le els, has been manually onboa d o he sys em. PLR
s a is ics a e hen collec ed a he i ual in e aces o he VNF ins ances. Gi en his se ing, a ic o a iable bi - a e is
sen be ween he VNFs (in pa icula , he Ipe ool is employed) du ing a se amoun o ime and bo h de ec ed
h oughpu s (a sende and ecei e ) as well as PLR s a is ic a e analyzed. Figu e 3 depic s he ob ained esul s as a
unc ion o he ime in wo si ua ions: one in which an ac ua ion amewo k is no p esen , hus no QoS gua an ees, and
an ano he in which he whole ac ua ion amewo k is exe cised. Fo he wo cases, he ini ial ne wo k capaci y o he
unnel ac oss he VNFs has been se o 25 Mb/s.
Figu e 3. Th oughpu s. Packe Loss es s wi hou ac ua ions ( op) and Th oughpu s. Packe Loss es s wi h policy-based
ac ua ions (bo om)
Figu e 3 ( op), depic s he case in which no policy no ac ua ion was se o o e come any de ec ed packe loss. The
h oughpu in his case, s a s inc easing om an ini ial alue o a ound 10Mp/s un il i eaches he 25Mp/s bounda y
( ep esen ed by he blue dashed line). As no p e en i e ac ion is con igu ed, he bi a e ecei ed a he se e side
eaches i s limi and is main ained benea h he a ailable bandwid h while he bi a e sen om he clien side con inues o
inc ease and su passes he limi , hus gene a ing packe losses. As a esul , when he bi a e sen by he clien eaches
50Mp/s, he packe loss a e can ge close o 60%, becoming an unsus ainable si ua ion in ega ds o QoS gua an ees.
This e idences he need o an ac ua ion sys em o eac o dynamic slice/se ice equi emen s and main ain desi ed
quali y le els. Then, we demons a e how he Policy Manage module is able o handle policy-based ac ua ions o
o e come low ne wo k pe o mance (Figu e 3 (bo om)). In his case, as be o e, h oughpu s a s inc easing g adually
om 10Mb/s. As i app oaches he 25Mp/s capaci y limi , he Moni o ing Manage s a s de ec ing packe losses. Once
he h eshold (1% is used o he expe imen al alida ion) is eached ( ep esen ed by he g een dashed line) he policy is
ac i a ed and he Policy Manage demands o an inc ease o bandwid h a he p o isioned ne wo k esou ces o
o e come he packe losses. As shown, he new limi is se o 40Mb/s while he pe cen age o los packe s d ops again o
ze o. In his case he h oughpu con inues o g ow, eaching again he new limi . As new packe losses a e de ec ed and
he p e en i e h eshold is exceeded again, he policy-based ac ua ion is igge ed a second ime, inc easing he
p o isioned bandwid h o 50 Mb/s. Packe Loss a io d ops one mo e ime o ze o, hus main aining he pe o mance o
he ne wo k a he equi ed s anda ds. In his ega d, i can be app ecia ed how he p oposed policy-based ac ua ion
amewo k is capable o main aining desi ed quali y le els o e he ime unde dynamic condi ions.
5. CONCLUSIONS
Wi h he ise o mode n ne wo k scena ios o 5G deploymen , echniques such as Ne wo k Slicing, Slice Composi ion
and Se ice Chaining, among o he s, come along o le e age legacy ne wo ks owa ds highe demanding equi emen s.
In his wo k we p esen ed an a chi ec u e capable o handling he p o isioning and main enance o 5G se ices h ough
he use o such echniques in op ically in e connec ed ne wo k scena ios. In u n, a Ne wo k Slice can be de-composed
o i s deploymen ac oss di e en segmen s o he ne wo k, conside ing he equi ed in e -VIM con igu a ions by he
in oduced NFV-C componen . Fu he mo e, se ices can be main ained h ough he ongoing moni o ing o speci ic
ne wo k pa ame e s and by ope a ing wi h a policy-based ac ua ion beha io . Expe imen al esul s shown in he pape
demons a e how equi ed pe o mance le els o he se ice can be gua an eed in case o ad e se QoS pe o mance o
dynamic equi emen s o he a ic ac oss he p o isioned Ne wo k Slice, hus, pa ing he way o au onomous and sel -
op imized 5G- eady op ical ne wo ks.
ACKNOWLEDGEMENT
This wo k has been suppo ed by he H2020 5GPPP SLICENET p ojec (H2020-ICT-2016-2/761913) and he Spanish
Go e nmen h ough p ojec ALLIANCE-B (TEC2017-90034-C2-2-R) wi h FEDER con ibu ion.
REFERENCES
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[3] ONF TR-526, Applying SDN A chi ec u e o Ne wo k Slicing, Issue 1, Ap il 2016.
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