interfaces and their protocol stacks _ lte and beyond _ tech-blog on 4g_lte and beyond

24. 1. 2014. Interfaces and their protocol stacks | LTE AND BEYOND | Tech-blog on 4G/LTE and beyond..

http://www.lteandbeyond.com/2012/01/interfaces-and-their-protocol-stacks.html 1/9

LTE, 4G, EPC, MME, PGW, SGW, Interfaces and beyond tech-blog by Bart Barton

LTE AND BEYOND

If you liked it, or content was helpful to you please add "+1" to article you used or share it on facebook or so.

Make it easier to find for others who could need those information, allow them find these articles on the spot. But.. it's your call.

Recommendations until now +32 Consiglialo su Google

J A N 8 , 2 0 1 2

Interfaces and their protocol stacks

After familiarising with main network elements, time has come to better know interfaces between those

elements.

Interfaces are allowing MME, SGW and PGW cooperating with other network elements( e.g. HSS or PCRF).

Each one of them is built in standardised way described by 3GPP.org. Each interface described here is taken

from 23.401 3GPP.org documentation.

Please keep in mind, that the documentation is (sometimes) bigger than we need it to be, so not every aspect

of interfaces is described here.

Lets start with big picture of situation in which user is not roaming.

Figure above is showing only 4G interfaces, additional interfaces for 2G and 3G are described in TS 23.060.

As I probably wrote earlier Serving Gateway (SGW) and PDN Gateway (PGW) could be put in one chassis.

As it comes to scenario with roaming architecture standards are describing two ways of dealing with it.

Two roaming scenarios:

where traffic is routed from home network to UE by S8 interface,

where there is local breakout with home operator's application functions only, and separate from

that with visited operator's application functions only.

Fig.1. Non-roaming architecture by 3GPP

Fig. 2. Roaming architecture scenario with home routed traffic

Search

SEARCH THIS BLOG

Bart Barton

Follow 155

I'm a M.Sc, B.Eng of Telco and

Electronics from Poland who

graduated both of his degree on

Military University of Technology in

Warsaw, Poland. I've created this

blog to help myself as others

gaining knowledge on LTE/4G and

beyond. Hope that it will be, or

maybe even was, useful to You.

When there is nothing to do, there

is always something to do. Except

doing the dishes, and so on. ;-)

You can find me also on LinkedIn

http://linkedin.com/in/bartbarton

or my profile on Google+ I'm also

running the

www.lteandbeyond.com

Also directly through bart [at] lte

and beyond [dot] com

View my complete profile

ABOUT ME

Home

A little bit about me

PAGES

Subscribe in a reader

SUBSCRIBE TECH-BLOG!

attach (4)

CDF (2)

CDR (1)

CSFB (2)

CTF (3)

DNS in LTE (6)

ECM (2)

EMM (4)

GUTI (3)

Gx (3)

Gy (3)

Handover (4)

IMEI (1)

Interfaces (4)

MME (9)

MME Selection (2)

LABEL

http://www.lteandbeyond.com/http://www.lteandbeyond.com/2012/01/functions-of-main-lte-packet-core.htmlhttp://www.3gpp.org/ftp/Specs/html-info/23401.htmhttp://1.bp.blogspot.com/-xGbyZl-cQNE/TwjdqM1WolI/AAAAAAAAAMY/sl68ItZbh-c/s1600/Non-roaming-arch.PNGhttp://4.bp.blogspot.com/-7_edz5Uri4U/TwjqevX_N_I/AAAAAAAAAMk/e6UZGVcXz1k/s1600/Roaming-scenario-routed-traffic.PNGhttp://2.bp.blogspot.com/-xzYiBq2LJWU/TwjqfL3TtvI/AAAAAAAAAMs/CkiYiwrowvg/s1600/Roaming-scenario-with-application-by-home-operators-only.PNGhttps://plus.google.com/102828058188201764369http://linkedin.com/in/bartbartonhttps://plus.google.com/u/0/102828058188201764369?rel=authorhttp://www.lteandbeyond.com/https://plus.google.com/102828058188201764369http://www.lteandbeyond.com/http://www.lteandbeyond.com/p/about-me.htmlhttp://feeds.feedburner.com/feedburner/ifhThttp://feeds.feedburner.com/feedburner/ifhThttp://www.lteandbeyond.com/search/label/attachhttp://www.lteandbeyond.com/search/label/CDFhttp://www.lteandbeyond.com/search/label/CDRhttp://www.lteandbeyond.com/search/label/CSFBhttp://www.lteandbeyond.com/search/label/CTFhttp://www.lteandbeyond.com/search/label/DNS%20in%20LTEhttp://www.lteandbeyond.com/search/label/ECMhttp://www.lteandbeyond.com/search/label/EMMhttp://www.lteandbeyond.com/search/label/GUTIhttp://www.lteandbeyond.com/search/label/Gxhttp://www.lteandbeyond.com/search/label/Gyhttp://www.lteandbeyond.com/search/label/Handoverhttp://www.lteandbeyond.com/search/label/IMEIhttp://www.lteandbeyond.com/search/label/Interfaceshttp://www.lteandbeyond.com/search/label/MMEhttp://www.lteandbeyond.com/search/label/MME%20Selection



Keeping that in mind, now we can go straight through interfaces their functions and protocol stack.

Information flow could be divided into two groups, one is Control Plane, and the other is User Plane.

The Control Plane consists of protocols for control and support of the user plane functions:

controlling the E-UTRA network access connections, such as attaching to and detaching from E-

UTRAN;

controlling the attributes of an established network access connection, such as activation of an IP

address;

controlling the routing path of an established network connection in order to support user mobility;

and

controlling the assignment of network resources to meet changing user demands.

Control Plane interfaces:

S1-MME interface between eNodeB and MME.

Reference point for the control plane protocol between E-UTRAN and MME.

Fig. 3. Roaming architecture for local breakout, with home operator's application functions only

Fig. 4. Roaming architecture for local breakout, with home visitor's application functions only

OCF (1)

OCS (3)

OFCS (2)

PCC (2)

PCEF (2)

PCRF (2)

PGW (3)

Resource (6)

S1 (5)

S5/S8 (1)

S6a (2)

SGs (3)

SGW (4)

Sy (1)

TAU (3)

TMSI (2)

2014 (3)

2013 (21)

2012 (19)

December (3)

October (1)

May (1)

April (1)

March (4)

February (1)

January (8)

LTE attach procedure

Gy interface - sitting betweenOCS and PCEF

Gx interface - sitting betweenPCRF and PCEF

Offline Charging System (OFCS)- introduction to G...

Online Charging System (OCS)- introduction to Gy ...

Interfaces and their protocolstacks

Functions of main LTE packetcore elements - MME, ...

This is where it all start

BLOG ARCHIVE

http://2.bp.blogspot.com/-xzYiBq2LJWU/TwjqfL3TtvI/AAAAAAAAAMs/CkiYiwrowvg/s1600/Roaming-scenario-with-application-by-home-operators-only.PNGhttp://2.bp.blogspot.com/-8DuwFjAuDkU/Twjqfgct5aI/AAAAAAAAAMw/WAASrqXCy-o/s1600/Roaming-scenario-with-application-by-visitor-operator-only.PNGhttp://4.bp.blogspot.com/-wmMqEHB5W7o/TwjxRM91hII/AAAAAAAAANA/WuxuQp92wiM/s1600/eNB-MME--S1-MME.PNGhttp://www.lteandbeyond.com/search/label/OCFhttp://www.lteandbeyond.com/search/label/OCShttp://www.lteandbeyond.com/search/label/OFCShttp://www.lteandbeyond.com/search/label/PCChttp://www.lteandbeyond.com/search/label/PCEFhttp://www.lteandbeyond.com/search/label/PCRFhttp://www.lteandbeyond.com/search/label/PGWhttp://www.lteandbeyond.com/search/label/Resourcehttp://www.lteandbeyond.com/search/label/S1http://www.lteandbeyond.com/search/label/S5%2FS8http://www.lteandbeyond.com/search/label/S6ahttp://www.lteandbeyond.com/search/label/SGshttp://www.lteandbeyond.com/search/label/SGWhttp://www.lteandbeyond.com/search/label/Syhttp://www.lteandbeyond.com/search/label/TAUhttp://www.lteandbeyond.com/search/label/TMSIjavascript:void(0)http://www.lteandbeyond.com/search?updated-min=2014-01-01T00:00:00%2B01:00&updated-max=2015-01-01T00:00:00%2B01:00&max-results=3javascript:void(0)http://www.lteandbeyond.com/search?updated-min=2013-01-01T00:00:00%2B01:00&updated-max=2014-01-01T00:00:00%2B01:00&max-results=21javascript:void(0)http://www.lteandbeyond.com/search?updated-min=2012-01-01T00:00:00%2B01:00&updated-max=2013-01-01T00:00:00%2B01:00&max-results=19javascript:void(0)http://www.lteandbeyond.com/2012_12_01_archive.htmljavascript:void(0)http://www.lteandbeyond.com/2012_10_01_archive.htmljavascript:void(0)http://www.lteandbeyond.com/2012_05_01_archive.htmljavascript:void(0)http://www.lteandbeyond.com/2012_04_01_archive.htmljavascript:void(0)http://www.lteandbeyond.com/2012_03_01_archive.htmljavascript:void(0)http://www.lteandbeyond.com/2012_02_01_archive.htmljavascript:void(0)http://www.lteandbeyond.com/2012_01_01_archive.htmlhttp://www.lteandbeyond.com/2012/01/lte-attach-procedure.htmlhttp://www.lteandbeyond.com/2012/01/gy-interface-sitting-between-ocs-and.htmlhttp://www.lteandbeyond.com/2012/01/gx-interface-sitting-between-pcrf-and.htmlhttp://www.lteandbeyond.com/2012/01/offline-charging-system-ofcs.htmlhttp://www.lteandbeyond.com/2012/01/online-charging-system-ocs-how-gy.htmlhttp://www.lteandbeyond.com/2012/01/interfaces-and-their-protocol-stacks.htmlhttp://www.lteandbeyond.com/2012/01/functions-of-main-lte-packet-core.htmlhttp://www.lteandbeyond.com/2012/01/this-is-where-it-all-start.html



Where:

S1-AP (S1 Application Protocol): Application Layer Protocol between the eNodeB and MME.

SCTP (Stream Control Transmission Protocol): This protocol guarantees delivery of signalling messages

between MME and eNodeB (S1). SCTP is defined in RFC 4960

S3 interface between SGSN and MME.

It enables user and bearer information exchange for inter 3GPP access network mobility in idle and/or active

state.

Where:

GTP-C (GPRS Tunnelling Protocol for the Control Plane): This protocol tunnels signalling messages between

SGSN and MME

UDP (User Datagram Protocol): This protocol signaling messages. UDP is defined in RFC 768.

S4 interface between SGSN and SGW.

It provides related control and mobility support between GPRS Core and the 3GPP Anchor function of Serving

GW. In addition, if Direct Tunnel is not established, it provides the user plane tunnelling.

Where:

GTP-C (mentioned above): This protocol tunnels signalling messages between SGSN and SGW.

UDP: This protocol transfers signalling messages. UDP is defined in RFC 768.

S5 or S8 interface between SGW and PGW.

S5: It provides user plane tunnelling and tunnel management between Serving GW and PDN GW. It is used for

Serving GW relocation due to UE mobility and if the Serving GW needs to connect to a non-collocated PDN GW

for the required PDN connectivity.

S8: Inter-PLMN reference point providing user and control plane between the Serving GW in the VPLMN

(Visited PLMN) and the PDN GW in the HPLMN (Home PLMN). S8 is the inter PLMN variant of S5.

Difference between those two interfaces is S5 is used in one network entity(no roaming scenario), and S8 is

being used to connect Visiting PLMN where user is with his Home PLMN.

Fig. 5. Protocol stack of S1-MME interface

Fig. 6. Protocol stack of S3 interface


Nokia Lumia520hrvatskitelekom.hr

Samo 8 kn u Planu za

surfanje M! Ponuda

vrijedi do 29.01.

LIVE TRAFFIC

http://4.bp.blogspot.com/-wmMqEHB5W7o/TwjxRM91hII/AAAAAAAAANA/WuxuQp92wiM/s1600/eNB-MME--S1-MME.PNGhttp://2.bp.blogspot.com/-CBaI81cQxW0/TwjzLrws_sI/AAAAAAAAANI/Rg2RgYdJ7BE/s1600/SGSN-MME--S3.PNGhttp://2.bp.blogspot.com/-PmheExV1gy4/Twj5LwoWj8I/AAAAAAAAANQ/DmT_g0xcudA/s1600/SGSN-SGW--S4.PNGhttp://3.bp.blogspot.com/-AQ_8FbeRJBg/Twj8PExjcbI/AAAAAAAAANY/724STMa2Jj4/s1600/SGW-PGW--S5orS8.PNGhttp://www.googleadservices.com/pagead/aclk?sa=L&ai=CGlJVgwjhUqH1KsOu7Qa88oC4BuKdhvcDmtiQ4HfX1qK9wAEQASCbgvwnUODchrb-_____wFgwOnbg9guoAH2_tbgA8gBAakCdFS86Ofhtj6oAwHIA8MEqgSvAU_QpnvzneVRt5swXnn5QvTLY5J5jfvAQjGxJJDFSPEjj1uf0rsi2E7-oxBOLLbjV-RC-P-zm9GP9b103obyXvrfHn6aNeOIkFtCL3zY6mY8S7I6e13p0Jy9dw2vYSHfDp_noGd-u4lCEqCJITEXedi44GebzY910qI5DsPmJaQDRUwYkYMJfUa8ffekC47gWb6e14Si5n47zRQZ7o7_50KTcETJ3HMfly62mJ0MXXqIBgGAB_KAqR8&num=1&cid=5GhdHM9CM8RTynM51aXNvNaV&sig=AOD64_3fqyWTkjllSKU5hMcQF5687PRvqw&client=ca-pub-5801674023504285&adurl=https://www.hrvatskitelekom.hr/najbolja-webshop-ponudahttp://www.googleadservices.com/pagead/aclk?sa=L&ai=CGlJVgwjhUqH1KsOu7Qa88oC4BuKdhvcDmtiQ4HfX1qK9wAEQASCbgvwnUODchrb-_____wFgwOnbg9guoAH2_tbgA8gBAakCdFS86Ofhtj6oAwHIA8MEqgSvAU_QpnvzneVRt5swXnn5QvTLY5J5jfvAQjGxJJDFSPEjj1uf0rsi2E7-oxBOLLbjV-RC-P-zm9GP9b103obyXvrfHn6aNeOIkFtCL3zY6mY8S7I6e13p0Jy9dw2vYSHfDp_noGd-u4lCEqCJITEXedi44GebzY910qI5DsPmJaQDRUwYkYMJfUa8ffekC47gWb6e14Si5n47zRQZ7o7_50KTcETJ3HMfly62mJ0MXXqIBgGAB_KAqR8&num=1&cid=5GhdHM9CM8RTynM51aXNvNaV&sig=AOD64_3fqyWTkjllSKU5hMcQF5687PRvqw&client=ca-pub-5801674023504285&adurl=https://www.hrvatskitelekom.hr/najbolja-webshop-ponudahttp://www.googleadservices.com/pagead/aclk?sa=L&ai=CGlJVgwjhUqH1KsOu7Qa88oC4BuKdhvcDmtiQ4HfX1qK9wAEQASCbgvwnUODchrb-_____wFgwOnbg9guoAH2_tbgA8gBAakCdFS86Ofhtj6oAwHIA8MEqgSvAU_QpnvzneVRt5swXnn5QvTLY5J5jfvAQjGxJJDFSPEjj1uf0rsi2E7-oxBOLLbjV-RC-P-zm9GP9b103obyXvrfHn6aNeOIkFtCL3zY6mY8S7I6e13p0Jy9dw2vYSHfDp_noGd-u4lCEqCJITEXedi44GebzY910qI5DsPmJaQDRUwYkYMJfUa8ffekC47gWb6e14Si5n47zRQZ7o7_50KTcETJ3HMfly62mJ0MXXqIBgGAB_KAqR8&num=1&cid=5GhdHM9CM8RTynM51aXNvNaV&sig=AOD64_3fqyWTkjllSKU5hMcQF5687PRvqw&client=ca-pub-5801674023504285&adurl=https://www.hrvatskitelekom.hr/najbolja-webshop-ponuda



Where:

GTP-C: This protocol tunnels signalling messages between SGW and PGW.

UDP: This protocol transfers signalling messages between SGW and PGW. UDP is defined in RFC 768.

S10 interface between MME and other MME.

Reference point between MMEs for MME relocation (e.g handover) and MME to MME information transfer.

Where:

GTP-C: This protocol tunnels signalling messages between MMEs.

UDP: This protocol transfers signalling messages between MMEs. UDP is defined in RFC 768.

S11 interface between MME and SGW.

Reference point between MME and Serving GW.

Where:

GTP-C: This protocol tunnels signalling messages between MME and SGW.

UDP: This protocol transfers signalling messages between MME and SGW. UDP is defined in RFC 768.

S6a interface between MME and HSS.

It enables transfer of subscription and authentication data for authenticating/authorizing user access to the

evolved system (AAA interface) between MME and HSS.

Fig. 8. Protocol stack of interface S5 or S8



Live Traffic Feed

Real-time view Menu

A visitor from Zagreb, Grad Zagrebarrived from google.hr and viewed"Interfaces and their protocol stacks |LTE AND BEYOND | Tech-blog on4G/LTE and beyond.." 1 day 4 hoursago

A visitor from So Paulo, Sao Pauloarrived from google.com.br andviewed "The Sy interface - betweenPCRF and OCS | LTE ANDBEYOND | Tech-blog on 4G/LTEand beyond.." 1 day 5 hours ago



A visitor from Wroclaw, Dolnoslaskiearrived from google.com and viewed"Offline Charging System (OFCS) -introduction to Gx interface | LTEAND BEYOND | Tech-blog on4G/LTE and beyond.." 1 day 5 hoursago

A visitor from Prague, Hlavni MestoPraha viewed "Functions of main LTE

packet core elements - MME, SGW,PGW | LTE AND BEYOND | Tech-blog on 4G/LTE and beyond.." 1 day5 hours agoA visitor from Rnninge, StockholmsLan left "Functions of main LTEpacket core elements - MME, SGW,PGW | LTE AND BEYOND | Tech-

blog on 4G/LTE and beyond.." via3gpp.org 1 day 5 hours agoA visitor from Rnninge, Stockholms

Lan left "Functions of main LTEpacket core elements - MME, SGW,PGW | LTE AND BEYOND | Tech-blog on 4G/LTE and beyond.." via

3gpp.org 1 day 5 hours agoA visitor from United Kingdomarrived from google.co.uk and viewed

"Interfaces and their protocol stacks |LTE AND BEYOND | Tech-blog on4G/LTE and beyond.." 1 day 5 hoursago

A visitor from Rnninge, StockholmsLan arrived from google.se and

viewed "Functions of main LTEpacket core elements - MME, SGW,PGW | LTE AND BEYOND | Tech-

http://3.bp.blogspot.com/-AQ_8FbeRJBg/Twj8PExjcbI/AAAAAAAAANY/724STMa2Jj4/s1600/SGW-PGW--S5orS8.PNGhttp://4.bp.blogspot.com/-0h0r3Ejxvw8/TwmEoQmz-oI/AAAAAAAAANk/yR-epoZ5A8A/s1600/MME-MME--S10.PNGhttp://4.bp.blogspot.com/-q68Hx4vFJ0U/TwmFVLFXY0I/AAAAAAAAANs/Vq6PnGo4NCo/s1600/MME-SGW--S11.PNGhttp://2.bp.blogspot.com/-9eFrm1sqmAQ/TwmIv-n9rOI/AAAAAAAAAN0/c-IlHAQVqi0/s1600/MME-HSS--S6a.PNGhttp://feedjit.com/?utm_source=ltf&utm_medium=web&utm_campaign=ltfCampaignhttp://live.feedjit.com/live/lteandbeyond.com/0/http://live.feedjit.com/live/lteandbeyond.com/0/http://feedjit.com/freeLiveTrafficFeed/?utm_source=ltf&utm_medium=web&utm_campaign=ltfCampaignhttps://www.google.hr/http://www.lteandbeyond.com/2012/01/interfaces-and-their-protocol-stacks.htmlhttp://www.google.com.br/url?sa=t&rct=j&q=&esrc=s&frm=1&source=web&cd=1&ved=0CCgQFjAA&url=http%3A%2F%2Fwww.lteandbeyond.com%2F2012%2F10%2Fthe-sy-interface-between-pcrf-and-ocs.html&ei=qQfhUtKmGrTNsASCjIH4Ag&usg=AFQjCNG54kTiDR9gGIelTMq6-j_k2ZJwPw&bvm=bv.59http://www.lteandbeyond.com/2012/10/the-sy-interface-between-pcrf-and-ocs.htmlhttp://www.google.com.br/url?sa=t&rct=j&q=&esrc=s&frm=1&source=web&cd=1&ved=0CCgQFjAA&url=http%3A%2F%2Fwww.lteandbeyond.com%2F2012%2F10%2Fthe-sy-interface-between-pcrf-and-ocs.html&ei=qQfhUtKmGrTNsASCjIH4Ag&usg=AFQjCNG54kTiDR9gGIelTMq6-j_k2ZJwPw&bvm=bv.59http://www.lteandbeyond.com/2012/10/the-sy-interface-between-pcrf-and-ocs.htmlhttp://www.google.com.br/url?sa=t&rct=j&q=&esrc=s&frm=1&source=web&cd=1&ved=0CCgQFjAA&url=http%3A%2F%2Fwww.lteandbeyond.com%2F2012%2F10%2Fthe-sy-interface-between-pcrf-and-ocs.html&ei=qQfhUtKmGrTNsASCjIH4Ag&usg=AFQjCNG54kTiDR9gGIelTMq6-j_k2ZJwPw&bvm=bv.59http://www.lteandbeyond.com/2012/10/the-sy-interface-between-pcrf-and-ocs.htmlhttp://www.google.com/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&docid=EJRIPB7zBX9CJM&tbnid=wVSRVsCljaYcAM:&ved=0CAEQjxw&url=http%3A%2F%2Fwww.lteandbeyond.com%2F2012%2F01%2Foffline-charging-system-ofcs.html&ei=sQfhUqSGJoTXswbcm4HAAQ&bvm=bv.59568121,http://www.lteandbeyond.com/2012/01/offline-charging-system-ofcs.htmlhttp://www.lteandbeyond.com/2012/01/functions-of-main-lte-packet-core.htmlhttp://www.lteandbeyond.com/2012/01/functions-of-main-lte-packet-core.htmlhttp://www.3gpp.org/ftp/Specs/html-info/23401.htmhttp://www.lteandbeyond.com/2012/01/functions-of-main-lte-packet-core.htmlhttp://www.3gpp.org/ftp/Specs/html-info/23401.htmhttp://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CCwQFjAA&url=http%3A%2F%2Fwww.lteandbeyond.com%2F2012%2F01%2Finterfaces-and-their-protocol-stacks.html&ei=CwbhUtTmO8ixtAa5w4GgAQ&usg=AFQjCNHAK0W53b4iVuEdLlQTWylS5TIErQ&bvm=bv.59568121,dhttp://www.lteandbeyond.com/2012/01/interfaces-and-their-protocol-stacks.htmlhttp://www.google.se/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CCoQFjAA&url=http%3A%2F%2Fwww.lteandbeyond.com%2F2012%2F01%2Ffunctions-of-main-lte-packet-core.html&ei=vwXhUun1HKWC4ATax4DQDg&usg=AFQjCNFJGUR3APEqpY02XN-f380SIdza5ghttp://www.lteandbeyond.com/2012/01/functions-of-main-lte-packet-core.html



Where:

Diameter: This protocol supports transferring of subscription and authentication data for

authenticating/authorizing user access to the evolved system between MME and HSS (S6a). Diameter is

defined in RFC 3588.

SCTP: This protocol transfers signalling messages. SCTP is defined in RFC 4960.

S13 interface between MME and EIR.

It enables UEEIR.

Where:

Diameter: This protocol supports UE identity check procedure between MME and EIR (S13). Diameter is defined

in RFC 3588.

SCTP: This protocol transfers signalling messages. SCTP is defined in RFC 4960.

SBc interface between CBC and eNodeB.

Reference point between CBC and MME for warning message delivery and control functions.

Cell Broadcast Center (CBC) was a solution for the special requirement of an Earthquake and Tsunami warning

system (ETWS) created for Japan, introduced in Rel. 8. It utilizes the existing interfaces between UE and MME

in control plane. Additionally the MME is connected to the CBC via the SBc interface. In LTE/4G SBc interface is

fully standardized and based on SCTP.

Where:

SBc-AP (SBc Application Protocol): Application Layer Protocol between CBC and MME. This protocol supports

transfer of warning messages.

S1-AP (S1 Application Protocol): Application Layer Protocol between the eNodeB and the MME.

SCTP: This protocol guarantees delivery of signalling messages between MME and eNodeB (S1). SCTP is defined

in RFC 4960.

User Plane interfaces:

Fig. 11. Protocol stack of S6a interface


Fig. 13. Protocol stack of SBc interface

http://2.bp.blogspot.com/-9eFrm1sqmAQ/TwmIv-n9rOI/AAAAAAAAAN0/c-IlHAQVqi0/s1600/MME-HSS--S6a.PNGhttp://4.bp.blogspot.com/-Ti3jZdYMpS8/TwmKTYWW9bI/AAAAAAAAAN8/ZdIftJTSSJk/s1600/MME-EIR--S13.PNGhttp://1.bp.blogspot.com/-PunyoH8mu0g/TwmRhmuXjqI/AAAAAAAAAOE/kY16xeknmu8/s1600/CBC-MME--S1-MME--SBc.PNG



User Plane in a big picture.

S1-U interface between eNodeB and SGW.

Reference point between E-UTRAN and Serving GW for the per bearer user plane tunnelling and inter eNodeB

path switching during handover.

Where:

GTP-U (GPRS Tunnelling Protocol for the user plane): This protocol tunnels user data between eNodeB and

SGW.

UDP: This protocol transfers user data. UDP is defined in RFC 768.

S4 interface between UE with 2G access and PGW.

S4 interface is also being used to connect UE with 3G access and PGW.

It provides related control and mobility support between GPRS Core and the 3GPP Anchor function of Serving

GW. In addition, if Direct Tunnel is not established, it provides the user plane tunnelling.

Where:

GTP U: This protocol tunnels user data between SGSN and the S GW as well as between the S GW and the P GW

in the backbone network. GTP shall encapsulate all end user IP packets.

UDP/IP: These are the backbone network protocols used for routing user data and control signalling.

Protocols on the Um and the Gb interfaces are described in TS 23.060.

Fig. 14. User Plane

Fig. 15. Protocol stack of S1-U interface

Fig. 16. Protocol stacks of S4 interfaces used to connect UE from 2G network to PDN

http://3.bp.blogspot.com/-H-45R7RTDIw/TwmTUTzfbdI/AAAAAAAAAOM/Qw0ku9csK48/s1600/UserPlane.PNGhttp://3.bp.blogspot.com/-yjWd_BPLe6A/TwmUJzMMC5I/AAAAAAAAAOU/xM1FZELKXLU/s1600/eNB-SGW--S1-U.PNGhttp://4.bp.blogspot.com/-G4gM0-Pput4/TwmYOE3cOfI/AAAAAAAAAO0/7reg184GNjo/s1600/UE-PGW-2g-via-S4-interface.PNG



17 comments

Top comments

Eric Shen 6 days ago - Shared publicly

Is GTP-U (over S1-U between eNodeB and SGW) ciphered?

1 Reply

Add a comment

Posted by Bart Barton at 2:48 PM

Labels: Interfaces, MME, PGW, S1, S5/S8, S6a, SGW

Location: Budapest, Hungary

S12 interface between UE from 3G network and PGW.

Reference point between UTRAN and Serving GW for user plane tunnelling when Direct Tunnel is established. It

is based on the Iu-u/Gn-u reference point using the GTP-U protocol as defined between SGSN and UTRAN or

respectively between SGSN and GGSN. Usage of S12 is an operator configuration option.

Where:

GTP U: This protocol tunnels user data between UTRAN and the S GW as well as between the S GW and the P

GW in the backbone network. GTP shall encapsulate all end user IP packets

UDP/IP: These are the backbone network protocols used for routing user data and control signalling.

Protocols on the Uu interface are described in TS 23.060.

SGSN controls the user plane tunnel establishment and establish a Direct Tunnel between UTRAN and S GW as

shown in Fig. 18.

Sources:

23.401 3GPP.org

Evolution of 3G Network - book on google books

Fig. 17. Protocol stacks of S4 interfaces used to connect UE from 3G network to PDN

Fig. 18. Protocol stack of S12 interface used to connect UE from 3G network to PDN

+32 Consiglialo su Google

http://www.lteandbeyond.com/2012/01/interfaces-and-their-protocol-stacks.html?google_comment_id=z13dzlvaikimczgzr04cgzkrlkqxj5p5s3khttps://apis.google.com/wm/1/100513999748827639368https://plus.google.com/102828058188201764369http://www.lteandbeyond.com/2012/01/interfaces-and-their-protocol-stacks.htmlhttp://www.lteandbeyond.com/search/label/Interfaceshttp://www.lteandbeyond.com/search/label/MMEhttp://www.lteandbeyond.com/search/label/PGWhttp://www.lteandbeyond.com/search/label/S1http://www.lteandbeyond.com/search/label/S5%2FS8http://www.lteandbeyond.com/search/label/S6ahttp://www.lteandbeyond.com/search/label/SGWhttp://maps.google.com/maps?q=Budapest,[email protected],19.040757799999938&z=10http://www.3gpp.org/ftp/Specs/html-info/23401.htmhttp://books.google.hu/books?id=xtWQOGXDU9IC&pg=PA66&lpg=PA66&dq=cbc+in+lte+sbc&source=bl&ots=jYUoHXsvY5&sig=DSpDA6iI8mH2tM_ltZtJmSS8LwU&hl=en&sa=X&ei=5I4JT7DJIvCP4gTDvcCSCA&redir_esc=y#v=onepage&q=cbc%20in%20lte%20sbc&f=falsehttp://1.bp.blogspot.com/-ut9iqSBBGc8/TwmVVqVC9ZI/AAAAAAAAAOc/2CUrg88JpXI/s1600/UE-PGW-3g-via-S4-interface.PNGhttp://2.bp.blogspot.com/-hepfJEDhD-s/TwmWf9PbgNI/AAAAAAAAAOk/nCSYkCMam78/s1600/UE-PGW-3g-via-S12-interface.PNGhttp://www.blogger.com/share-post.g?blogID=8169629555681039810&postID=6288797902194788763&target=emailhttp://www.blogger.com/share-post.g?blogID=8169629555681039810&postID=6288797902194788763&target=bloghttp://www.blogger.com/share-post.g?blogID=8169629555681039810&postID=6288797902194788763&target=twitterhttp://www.blogger.com/share-post.g?blogID=8169629555681039810&postID=6288797902194788763&target=facebook



sanket ghate 3 weeks ago - Shared publicly

Very useful indeed

1

Akhilesh soni 4 months ago - Shared publicly

This page is really helpful. Knowledge has to be shared like this.

1 Reply

Vijay Reddy 1 month ago - Shared publicly

very useful and organized

1 Reply

Andrew Caruana via Google+ 2 months ago - Shared publicly

Very intersting reading :)

1 Reply

swagata mukherjee 1 month ago - Shared publicly

Useful article . Thanks

+121

1 Reply

Joseph wa kamula 2 months ago - Shared publicly

Excellent effort Bart

1

muhammad mujtaba 2 months ago - Shared publicly

good one

1 Reply

Jofuntube via Google+ 2 months ago - Shared publicly

1 Reply

Ranjit kumar 4 months ago - Shared publicly

1 Reply

Anonymous 5 months ago

Ueful article on Knoweldge sharing.


Thanks for your reply I guess SCTP HBs are only sent in s6a multi-homing connections.

Would you know the 3GPP standard that defines the "mandatory" behaviour of SCTP? For

some reason I'm not seeing any HB for s6a when in single-homing mode.


Is it mandatory that heartbeats are sent in SCTP s6a single homing connections?

Oh yes they are. As through the heartbeats the SCTP's path management function

monitors the reachability of the end nodes. From troubleshooting point of view those

messages are helping to define on which layer there is a connectivity problem. I would

even said that because of that and probably few others features SCTP was chosen to

be used. Please correct me if I'm wrong on the last one (or any of the above).

Bart Barton 10 months ago

Anonymous 1 year ago

Very nice document, I like it a lot. But X2 interface is missing

http://www.lteandbeyond.com/2012/01/interfaces-and-their-protocol-stacks.html?google_comment_id=z13qdxpojlrsybg5404cihpzdpj5vxt4pzk0khttps://apis.google.com/wm/1/107540383587613489492http://www.lteandbeyond.com/2012/01/interfaces-and-their-protocol-stacks.html?google_comment_id=z13xujmqoyvafbqin04cebq43tqlizsznashttps://apis.google.com/wm/1/105478641877801197613http://www.lteandbeyond.com/2012/01/interfaces-and-their-protocol-stacks.html?google_comment_id=z12fgttb4u2bvt5md23jfhix4pydhj5vvhttps://apis.google.com/wm/1/102786864159688102633https://apis.google.com/wm/1/110565370811938013418/posts/QzidwY2C7Rwhttps://apis.google.com/wm/1/110565370811938013418http://www.lteandbeyond.com/2012/01/interfaces-and-their-protocol-stacks.html?google_comment_id=z13axxmykkfud5frv04cehurlnrpgrvgu30https://apis.google.com/wm/1/111525873638675522836http://www.lteandbeyond.com/2012/01/interfaces-and-their-protocol-stacks.html?google_comment_id=z12dwji5ky2mgvrrx04cgdhorrmwjfxwtu40khttps://apis.google.com/wm/1/103356251236949027609http://www.lteandbeyond.com/2012/01/interfaces-and-their-protocol-stacks.html?google_comment_id=z13wwfk5zzj0w3kcj22bxdsh1prbtttufhttps://apis.google.com/wm/1/102856753068010427634https://apis.google.com/wm/1/118157588641590484173/posts/EWWdTBYSqdbhttps://apis.google.com/wm/1/118157588641590484173https://apis.google.com/wm/1/106204440075265262253/posts/6BQ5AFntwP3https://apis.google.com/wm/1/106204440075265262253http://www.lteandbeyond.com/2012/01/interfaces-and-their-protocol-stacks.html?showComment=1375432528823#c4749404151383478002http://www.lteandbeyond.com/2012/01/interfaces-and-their-protocol-stacks.html?showComment=1362671453584#c3171297282639898405http://www.lteandbeyond.com/2012/01/interfaces-and-their-protocol-stacks.html?showComment=1362410454368#c8948572489584222297http://www.lteandbeyond.com/2012/01/interfaces-and-their-protocol-stacks.html?showComment=1362410454368#c8948572489584222297https://plus.google.com/102828058188201764369/http://www.lteandbeyond.com/2012/01/interfaces-and-their-protocol-stacks.html?showComment=1356098653405#c3167051345644098484



Newer Post Older Post


I love this document, i just read it today, but tomorrow i will try to look for some more

details on User-plane. very nice..


Useful Information

Home

Subscribe to: Post Comments (Atom)

Bart Barton

155 followers

Follow

FOLLOW ME MAYBE?

Bart Barton. Powered by Blogger.

http://www.lteandbeyond.com/2012/01/online-charging-system-ocs-how-gy.htmlhttp://www.lteandbeyond.com/2012/01/functions-of-main-lte-packet-core.htmlhttp://www.lteandbeyond.com/2012/01/interfaces-and-their-protocol-stacks.html?showComment=1355157535264#c2465078739838325483http://www.lteandbeyond.com/2012/01/interfaces-and-their-protocol-stacks.html?showComment=1344345042306#c4693503152760974071http://www.lteandbeyond.com/http://www.lteandbeyond.com/feeds/6288797902194788763/comments/defaulthttps://plus.google.com/102828058188201764369?prsrc=5http://www.blogger.com/

interfaces and their protocol stacks _ lte and beyond _ tech-blog on 4g_lte and beyond

Documents

g interfaces

additional interfaces

aspectof interfaces

roaming architecture

home network

roaming architecture

nonroaming architecture

roaming scenarios