Air Interface Physical Layer

8/11/2019 Air Interface Physical Layer

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Air Interface Physical Layerin Physical Layer , Specification , Uu , LTE

The LTE air interface physical layer offers data transport services to higher layers. The access to

these services is through the use of a transport channel via the MAC sub layer. The physicallayer is e!pected to perfor" the follo#ing functions in order to provide the data transport service$

Error detection on the transport channel and indication to higher layers %EC encoding&decoding of the transport channel 'ybrid A() soft co"bining (ate "atching of the coded transport channel to physical channels Mapping of the coded transport channel onto physical channels Po#er #eighting of physical channels Modulation and de"odulation of physical channels %re*uency and ti"e synchronisation (adio characteristics "easure"ents and indication to higher layers Multiple +nput Multiple utput -M+M antenna processing Trans"it /iversity -T0 diversity 1ea"for"ing (% processing

GPRS Tunnelling Protocol User Plane (GTP-U)in 2TP U , S3 , S4 , S5 , Specification , LTE , S6 , 07

2TP U protocol is used over S6 U, 07, S3, S4 and S5 interfaces of the Evolved Pac8et Syste"-EPS . 2TP U Tunnels are used to carry encapsulated T P/Us and signalling "essages bet#eena given pair of 2TP U Tunnel Endpoints. The Tunnel Endpoint +/ -TE+/ #hich is present in the2TP header indicates #hich tunnel a particular T P/U belongs to.

The transport bearer is identified by the 2TP U TE+/ and the +P address -source TE+/,destination TE+/, source +P address, destination +P address .

GTP-U Transportin S3 , S4 , S5 , Specification , U/P , +P, LTE , S6 , 07

The transport layer for data strea"s over S6, 07, S3, S4 and S5 is an +P based Transport. The2TP U protocol over U/P over +P is supported as the transport for data strea"s on the userdata interfaces.

Any data lin8 protocol that fulfils the re*uire"ents to#ard the upper layer "ay be used.

UDP/IP

The U/P port nu"ber for 2TP U is as defined in 92PP TS 7:.756.
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The e;1 and the EPC support frag"entation and asse"bly of 2TP pac8ets at the +P

layer. The e;1 and the EPC support +Pv< and&or +Pv3.

Mediu Access !ontrol (MA!)in Specification , LTE , MAC

MAC protocol layer e!ists in UE = e;odeb, +t is part of LTE air interface control and user planes.

The "ain services and functions of the MAC sublayer include$

Mapping bet#een logical channels and transport channels> Multiple!ing&de"ultiple!ing of MAC S/Us belonging to one or different logical channels

into&fro" transport bloc8s -T1 delivered to&fro" the physical layer on transport channels> scheduling infor"ation reporting> Error correction through 'A()> Priority handling bet#een logical channels of one UE> Priority handling bet#een UEs by "eans of dyna"ic scheduling> Transport for"at selection> Padding.

"on-Access-Stratu ("AS) Protocolin ;AS , Specification , LTE

The non access stratu" -;AS is highest stratu" of the control plane bet#een UE and MME atthe radio interface. Main functions of the protocols that are part of the ;AS are the support of"obility of the user e*uip"ent -UE and the support of session "anage"ent procedures toestablish and "aintain +P connectivity bet#een the UE and a pac8et data net#or8 gate#ay -P/;2? .

;AS control protocol perfor"s follo#ings$ EPS bearer "anage"ent> Authentication> ECM +/LE "obility handling> Paging origination in ECM +/LE> Security control.

Pac#et $ata !on%ergence Protocol (P$!P)in P/CP , Specification , LTE

P/CP protocol layer e!ists in UE = e;odeb, +t is part of LTE air interface control and user planes.
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The "ain services and functions of the P/CP sublayer for the user plane include$

'eader co"pression and deco"pression$ ( 'C only> Transfer of user data> +n se*uence delivery of upper layer P/Us at P/CP re establish"ent procedure for

(LC AM> /uplicate detection of lo#er layer S/Us at P/CP re establish"ent procedure for (LC

AM> (etrans"ission of P/CP S/Us at handover for (LC AM> Ciphering and deciphering> Ti"er based S/U discard in uplin8.

The "ain services and functions of the P/CP for the control plane include$

Ciphering and +ntegrity Protection> Transfer of control plane data.

Radio Lin# !ontrol (RL!)in Specification , LTE , (LC

(LC protocol layer e!ists in UE = e;odeb, +t is part of LTE air interface control and user planes.

The "ain services and functions of the (LC sublayer include$

Transfer of upper layer P/Us> Error Correction through A() -only for AM data transfer > Concatenation, seg"entation and reasse"bly of (LC S/Us -only for UM and AM data

transfer > (e seg"entation of (LC data P/Us -only for AM data transfer > +n se*uence delivery of upper layer P/Us -only for UM and AM data transfer > /uplicate detection -only for UM and AM data transfer > Protocol error detection and recovery> (LC S/U discard -only for UM and AM data transfer > (LC re establish"ent.

Radio Resource !ontrol (RR!)in Specification , ((C , LTE

((C protocol layer e!ists in UE = e;odeb, +t is part of LTE air interface control plane. The "ainservices and functions of the ((C sublayer include$

1roadcast of Syste" +nfor"ation related to the non access stratu" -;AS > 1roadcast of Syste" +nfor"ation related to the access stratu" -AS > Paging>
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Establish"ent, "aintenance and release of an ((C connection bet#een the UE and

E UT(A; Security functions including 8ey "anage"ent> Establish"ent, configuration, "aintenance and release of point to point (adio 1earers>

Mobility functions )oS "anage"ent functions> UE "easure"ent reporting and control of the reporting> ;AS direct "essage transfer to&fro" ;AS fro"&to UE.

S& Application Protocol (S&AP)in Specification , LTE , S6AP

S6AP provides the signalling service bet#een E UT(A; and the evolved pac8et core -EPC and

has follo#ing functions$

E (A1 "anage"ent function +nitial Conte!t Transfer function UE Capability +nfo +ndication function Mobility %unctions S6 interface "anage"ent functions ;AS Signalling transport function S6 UE conte!t (elease function UE Conte!t Modification function Status Transfer Trace function Location (eporting S6 C/MA7@@@ Tunneling function ?arning "essage trans"ission function (A; +nfor"ation Manage"ent -(+M function Configuration Transfer function

S& layer &in Specification , LTE , S6

The "ain functions of S6 interface layer 6 are as follo#ing$

+nterface to physical "ediu"> %ra"e delineation> Line cloc8 e!traction capability> Layer 6 alar"s e!traction and generation> Trans"ission *uality control.
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S& Signalling Transportin +Pv3, +Pv


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' layer &in Specification , LTE , 07

The "ain functions of 07 interface layer 6 are as follo#ing$

+nterface to physical "ediu"> %ra"e delineation> Line cloc8 e!traction capability> Layer 6 alar"s e!traction and generation> Trans"ission *uality control.

' Signalling Transportin Specification , LTE , 07

07 signalling bearer provides the follo#ing functions$

Provision of reliable transfer of 07 AP "essage over 07 interface. Provision of net#or8ing and routeing function Provision of redundancy in the signalling net#or8 Support for flo# control and congestion control

L2 - Data link layer

Support of any suitable data lin8 layer protocol, e.g. PPP, Ethernet

IP layer

The e;1 supports +Pv< and&or +Pv3 The +P layer of e;1 e;1 only supports point to point trans"ission for delivering 07 AP

"essage. The e;1 supports the /iffserv Code Point "ar8ing

Transport layer

SCTP is supported as the transport layer of e;1 e;1 signalling bearer.

SCTP refers to the Strea" Control Trans"ission Protocol developed by the Sigtran

#or8ing group of the +ET% for the purpose of transporting various signalling protocols over +P net#or8.

There is only one SCTP association established bet#een e;1 pairs. The e;1 establishes the SCTP association. The SCTP /estination Port nu"ber value

assigned by +A;A to be used for 07AP is 9

Air Interface Physical Layer

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