48056-A00 - Base Station Controller - Base Transceiver Station (BSC - BTS) Interface; Layer 2 Specification

8/12/2019 48056-A00 - Base Station Controller - Base Transceiver Station (BSC - BTS) Interface; Layer 2 Specification

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3GPP TS 48.056 V10.0.0 (2011-03)

Technical Specification

3rd Generation Partnership Project;Technical Specification Group GSM/EDGE Radio Access Networ;

!ase Station "ontroller # !ase Transcei$er Station%!S" # !TS& interface;'a(er ) specification

%Release *+&

GLOBAL SYSTEM FOR

MOBILE COMMUNICATIONS

R

The present document has been developed within the 3rd Generation Partnership Project (3GPP TM) and may be further elaborated for the purposes of 3GPP.

The present document has not been subject to any approval process by the 3GPP Oranisational Partners and shall not be implemented.

This !pecification is provided for future development wor" within 3GPP only. The Oranisational Partners accept no liability for any use of this!pecification.

!pecifications and reports for implementation of the 3GPP TM system should be obtained via the 3GPP Oranisational Partners# Publications Offices.



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o%te%ts

1ontents....................................................................................................................................................3

7oreword...................................................................................................................................................8

, !cope......................................................................................................................................................8

* /eferences..............................................................................................................................................8

3 9efinitions and abbreviations.................................................................................................................:

8 General description................................................................................................................................:

: 7unctional contents................................................................................................................................;

; 5P9 functions.....................................................................................................................................;;., 2'ceptions and modifications................................................................................................................................;;.,., <oid =

;.,.* 1ommand>/esponse field bit (1>/).................................................................................................................. ..=;.,.3 !ervice ccess Point %dentifier (!P%)...............................................................................................................=

;.,.8 T2% for point?to?point data lin" connection........................................................................................................=;.,.: 1ommands and responses...................................................................................................................................=

;.,.; 2'chane identification (@%9) command>response.......................................................................................... ..=;.,.= M95?@%9...........................................................................................................................................................=

;.,.A PB?9T- PB 921T%<T2 and PB?1T%<T2........................................................................................A;.,.C MPB?1T%<T2- MPB?921T%<T2 an MPB?%&7O/MT%O&..............................................................A

;.,.,+ Priority indicator...............................................................................................................................................A;.,.,, Terminal 2ndpoint %dentifier (T2%) manaement procedures...........................................................................A

;.,.,,., General A;.,.,,.* T2% assinment procedure..............................................................................................................................A

;.,.,,.3 T2% identity verify procedure.......................................................................................................................,+

;.,.,,.8 7ormats and codes........................................................................................................................................,+;.,.,* utomatic neotiation of data lin" layer parameters......................................................................................,+

;.,.,3 2stablishment procedures................................................................................................................................,+;.,.,8 &(!) seDuence error.........................................................................................................................................,,

;.,.,: 5ist of system parameters................................................................................................................................,,

;.,.,:., Timer T*++...................................................................................................................................................,,;.,.,:.* Ma'imum number of retransmissions (&*++).............................................................................................,,

;.,.,:.3 Ma'imum number of octets in an information field (&*+,)........................................................................,,;.,.,:.8 Ma'imum number of transmission of the T2% identity reDuest messae (&*+*)........................................,,

;.,.,:.: Ma'imum number of outstandin frames ($).............................................................................................,,;.,.,:.; Timer T*+,...................................................................................................................................................,,

;.,.,:.= Timer T*+*...................................................................................................................................................,*;.,.,:.A Timer T*+3...................................................................................................................................................,*

;.,.,; 9ata lin" layer monitor function.....................................................................................................................,*;.,.,= Miscellaneous..................................................................................................................................................,*

Annex A (informative):

Can!e "i#tor$%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%&'



'oreord

This Technical !pecification has been produced by the 3 rd Generation Partnership Project (3GPP).

The contents of the present document are subject to continuin wor" within the T!G and may chane followin formalT!G approval. !hould the T!G modify the contents of the present document- it will be re?released by the T!G with anidentifyin chane of release date and an increase in version number as followsE

<ersion '.y.

whereE

' the first diitE

, presented to T!G for informationF

* presented to T!G for approvalF

3 or reater indicates T!G approved document under chane control.

y the second diit is incremented for all chanes of substance- i.e. technical enhancements- corrections-updates- etc.

the third diit is incremented when editorial only chanes have been incorporated in the document.

1 So"e

The present document specifies the lin" layer used for sinallin on the ?bis interface between 0!1 and 0T!. The use

and eneral aspects of the ?bis interface are described in 3GPP T! 8A.+:, and the interface aspects in 3GPP T!8A.+:*.

The 5in" ccess Procedure on the 9?channel (5P9) specification used on the ?bis interface in the G!M P5M& is asubset of the 2& 3++ ,*: which in turn has less options than the 11%TT /ecommendation .C*,.

This description contains first the protocol definitions and second the services provided by the layer * to the layer 3.

2 Reere%es

The followin documents contain provisions which- throuh reference in this te't- constitute provisions of the present

document.

• /eferences are either specific (identified by date of publication- edition number- version number- etc.) or

non?specific.

• 7or a specific reference- subseDuent revisions do not apply.

• 7or a non?specific reference- the latest version applies. %n the case of a reference to a 3GPP document (includin

a G!M document)- a non?specific reference implicitly refers to the latest version of that document in the same

Release as the present document .

H,I 3GPP T! *,.C+:E J<ocabulary for 3GPP !pecificationsJ.

H*I 3GPP T! 8A.+:,E J0ase !tation 1ontroller ? 0ase Transceiver !tation (0!1 ? 0T!) interfaceF

General aspectsJ.

H3I 3GPP T! 8A.+:*E J0ase !tation 1ontroller ? 0ase Transceiver !tation (0!1 ? 0T!) interfaceF%nterface principlesJ.

H8I <oid.



H:I <oid.

H;I <oid.

H=I <oid.

HAI <oid.

HCI <oid.

H,+I <oid.

H,,I <oid.

H,*I <oid.

H,3I <oid.

H,8I <oid.

H,:I <oid.

H,;I <oid.

H,=I <oid.

H,AI <oid.

H,CI 11%TT /ecommendation .C*,E J%nterated services diital networ" (%!9&) user?networ"interface ? 9ata lin" layer specificationJ.

H*+I 2& 3++ ,*:E J%nterated !ervices 9iital &etwor" (%!9&)F ser?networ" interface data lin" layerspecification pplication of 11%TT /ecommendations .C*+>%.88+ and .C*,>%.88,J.

3 ei%itio%s a%d a&&reiatio%sbbreviations used in the present document are listed in 3GPP T! *,.C+:.

4 Ge%era! desri"tio%

The followin information cateories are supported by the procedures of this layer * /ecommendationE

? sinallin (includin !hort Messae !ervice (!M!) information)F

? operation and maintenanceF

? layer * manaement.

7or each of these cateories the 0!1 may have one or more layer * lin"s to every T/@ and 017.

The sinallin lin"s over the ?bis interface are addressed to the different units by Terminal 2ndpoint %dentifiers (T2%).

The same unit will normally have more than one functional entity. The loical lin"s between different functional

entities are identified by functional addresses- the !ervice ccess Points %dentifier (!P%).

7iure , shows the architectural model with different layer * lin"s.

number of loical lin"s may be multiple'ed on each physical lin". The same layer * loical lin" may not bedistributed over more than one physical lin".



____________________| ________ || | | || | | __ | __ ______| | || |_______RSL________SAPI_=_0___| |__| || | || |_______OML________SAPI_=_62__| |__| || | || |_______L2ML_______SAPI_=_63__| |__| TRX |TEI 1| | || | | |__| |

| | ||__| |__| |______|| |LAYER 2| | __ ______| | | __ | | |__| || | || |_____|_RSL________SAPI_=_0___| |__| || | || |_______OML________SAPI_=_62__| |__| TRX |TEI 2| | || |_______L2ML_______SAPI_=_63__| |__| || | T E I || | | | |______|| | || |_______RSL________SAPI_=_0___| | ______| | || |_______OML________SAPI_=_62__| |__| || | || |_______L2ML_______SAPI_=_63__| |__| || | ||__| | |__| TRX |TEI 3| | | | | |__| || |MANAGE-| | |__| |______|| |MENT | __ | __ ______| | || |_______OML________SAPI_=_62__| |__| || | || |_______L2ML_______SAPI_=_63__| |__| BCF |TEI 4| | ||__| |__| | || | | __ _ | __ | || | || | _ _ | OML _ _ _ _SAPI = 62_ | |__| |TEI 65| | || | _ _ | L2ML_ _ _ _SAPI = 63_ | |__| || |_______||__| | |__| |______|| ||___________________|

,i-ure .*0 An e1a2ple of 'o-ical 'a(er ) lins supported ( three per2anentand one se2iper2anent lins

5 'u%tio%a! o%te%ts

The basic functional content of the layer * protocol isE

? transparent layer * lin"s and time fillF

? point?to?point dedicated layer * lin"s addressin both physical entities and functional entitiesF

? point?to?multipoint addressed lin"s used for layer * manaementF

? basic functions for T2% assinment and manaementF

? basic priority functionsF

? basic supervision of lin"s when not carryin trafficF

? seDuence controlF

? transmission error controlF

? control of errors not recoverable by retransmission.

6 L$P u%tio%s

The 5P9 functions as specified in 2& 3++ ,*: are applicable. Bowever- the e'ceptions and modifications specified inthe remainder of the present document shall be used.

6.1 *e"tio%s a%d odiiatio%s

%n the followin headlines from 2& 3++ ,*: are "ept and references are made to the correspondin clause of 2& 3++

,*:.



6.1.1 Void

6.1.2 oa%dRes"o%se ie!d &it (R)

(/efer to 2& 3++ ,*:- part *- clause 3.3.*)

%n G!M P5M&#s 0!1 represents the networ" side and T/@>017 the user side of the interface.

6.1.3 Serie $ess Poi%t 7de%tiier (S$P7)

(/efer to 2& 3++ ,*:- part *- clause 3.3.3)

The !P% values for the ?bis interface are as listed in table ;.,.3.

Tale 4*30 Allocation of SAP5 $alues and priorit( classes

SAP5 $alue Related la(er 3 or la(er 2ana-e2ent entit( Priorit(

0 Radio si%a!!i% "roedures 2

1 Resered or "aet ode ou%iatio%s usi% 9.31 a!! o%tro! "roedures(ot used i% GSM PLM)

-

16 Resered or "aet ou%iatio% o%ori% to :.25 !ee! 3 "roedures (otused i% GSM PLM

-

62 ;"eratio% a%d ai%te%a%e "roedure 1

63 La<er 2 a%aee%t "roedures 1

$!! ot#ers Resered or uture sta%dardi=atio% -

6.1.4 T*7 or "oi%t-to-"oi%t data !i% o%%etio%

(/efer to 2& 3++ ,*:- part *- clause 3.3.8.*).

The remainin Terminal 2ndpoint %dentifier (T2%) values are used for the point?to?point data lin" connectionsassociated with the addressed !ervice ccess Point (!P). The rane of T2% values shall be allocated as shown in table

;.,.8.

Tale 4*.0 Allocation of TE5 $alues

TE5 $alue 6ser t(pe

0-63 T*7 assi%e%t or ied TR: a%d >' addresses64-126 T*7 assi%e%t or additio%a!, TR: or >' addresses

&OT2E 017 is iven a separate layer * lin" only if it is not interated with a T/@.

6.1.5 oa%ds a%d res"o%ses(/efer to 2& 3++ ,*:- part *- clause 3.;.,)

The @%9 command and response are not used.

6.1.6 *#a%e ide%tiiatio% (:7) oa%dres"o%se

(/efer to 2& 3++ ,*:- part *- clause 3.;.,*)

This functionality is not used.

6.1./ ML-:7(/efer to 2& 3++ ,*:- part *- clause 8.,.,.C)



This functionality is not used.

6.1.8 P?-$T$, P? *$T7V$T* a%d P?-$T7V$T*

(/efer to 2& 3++ ,*:- part *- clauses 8.,.,.,+ ? 8.,.,.,*)

This functionality is not relevant.

6.1. MP?-$T7V$T*, MP?-*$T7V$T* a% MP?-7';RM$T7;

(/efer to 2& 3++ ,*:- part *- clauses 8.,.,.,3 ? 8.,.,.,:)

This functionality is not relevant.

6.1.10 Priorit< i%diator

(/efer to 2& 3++ ,*:- part *- clause 8.,.3.,)

The different !P%s are iven the priority classes as listed in table , when contendin (with priority one as the hihest).

6.1.11 Teri%a! *%d"oi%t 7de%tiier (T*7) a%aee%t "roedures

(/efer to 2& 3++ ,*:- part *- clause :.3)

9ue to the special assinment functions needed on the ?bis interface there are modifications and additions to theassinment procedures. The rest of clause :.3 in 2& 3++ ,*:- part *- is "ept if not stated otherwise.

6.1.11.1 Ge%era!

(/efer to 2& 3++ ,*:- part *- clause :.3.,)

T2% manaement for ?bis interface is based on the followin procedural meansE

? a !ubset of the T2% assinment proceduresF

? the T2% chec" proceduresF

? the T2% remove proceduresF

? an additional T2% assinment procedure.

The T2% manaement needs procedures to chec" the used T2% values and procedures for reaction in situation wheremore than one T/@ eDuipment uses the same T2% value. %n addition to the fi'ed values it shall be possible to use

additional T2% value to the same T/@ eDuipment and thus increase the sinallin capacity.

6.1.11.2 T*7 assi%e%t "roedure

(/efer to 2& 3++ ,*:- part *- clause :.3.*)

The T2% assinment procedure used on the ?bis interface has some additions to the automatic T2% assinment procedure specified in 2& 3++ ,*:- part *.

To facilitate the confiuration control in the 0!1 each T/@ will have a fi'ed T2% and possibly et access to one ormore additional T2%s assinin physical channels>layer * lin"s.

The layer * lin"s may all be turned on and off accordin to the normal automatic T2% assinment scheme but the T/@may only reDuest identified T2% values which is (semi?) permanently prorammed or prorammed by operation and

maintenance messaes.

%n G!M the reference number /i is not used. %t is only misoperation situations resultin from double failures that could

be prevented>solved faster by this parameter. The marinal advantae is not supposed to motivate the application of arandom enerator and the chec"in procedure.



The subset of the automatic assinment procedure applicable for the first layer * lin" to a T/@ shall have the followin

modifications to 2& 3++ ,*:- part *E

? the identity reDuest shall have an i value in the rane +?;3 identifyin the T2% value which is reDuested foractivationF

? on reception of the identity reDuest messae the 0!1 will chec" that the reDuested T2% may be used from theconfiurations aspects and then perform a normal T2% chec" procedure to prevent a double assinmentF

? if the T2% reDuest is accepted an identity assined messae with the reDuested T2% number is received by T/@

before the e'piry of timer T*+*F

? a successful assinment procedure is shown in fiure ;.,.,,.*.a.

TRX BSC | | | | Ide!"!# $e%&e'! (A") | | | | | | Ide!"!# *+e*, $e%&e'! (A") |

| | | | | | | | N$./ | | | | | "de!"!# | | |

T202 | | *+e*, | | T201 | | | $*ed&$e | | | | | N /'e$ | | | | | | | | Ide!"!# /''"ed (A") | | |

I !".e$ T201 e"$e' !+e $e%&e'! '+/ 7e $ee/!ed *e /d !".e$ T201 $e'!/$!ed

,i-ure 4***)a0 A successful assi-n2ent procedure

%f timer T*+* e'pires the assinment procedure did not succeed- and the T/@ will ta"e further actions in accordance

with the procedures as specified in 2& 3++ ,*:- part *.

%f within the assinment procedure an identity chec" response is received- then the reDuested T2% value is already in

use. There shall be no answer to the reDuestin T/@ and an error indication shall be sent to OKM.

n e'ample of a non?successful assinment procedure is shown in fiure ;.,.,,.*.b.

TRX BSC | | | | Ide!"!# $e%&e'! (A") | | | | T202 | | Ide!"!# *+e*, $e%&e'! (A") |

| | | | T201 | | Ide!"!# *+e*, $e''e (A") | | | | | | | |


,i-ure 4***)0 An e1a2ple of assi-n2ent in error case %TE5 $alue alread( in use&

The additional T2% assinment procedure is eDuivalent to the normal one with two e'ceptionsE

? the T2% value is in the raneE ;8?,*;F

? the T2% value and the identification of which physical lin" it shall operate on is transmitted to the T/@ from0!1 in an operation and maintenance messae. This layer 3 OKM messae is transferred on an already assined

layer * lin". (!ee ,*?series of G!M Technical !pecifications).

The successful additional assinment procedure is shown in fiure ;.,.,,.*.c.



TRX BSC | | | O8M *../d (A"9 +#'"*/ /dd$e'') | | | | | | Ide!"!# $e%&e'! (A") | | | | | | Ide!"!# *+e*, $e%&e'! (A") |

| | | | | |

| | Ide!"!# *+e*, | | T202 | | | P$*ed&$e | | | T201 | | "!+ $e''e $. | | | | | !+e TRX '"de | | | | | | | | Ide!"!# /''"ed (A") | | |


,i-ure 4***)c0 The procedure for assi-nin- an additional TE5 to a TR7 or !",

6.1.11.3 T*7 ide%tit< eri< "roedure

(/efer to 2& 3++ ,*:- part *- clause :.3.:)

This procedure is not used.

6.1.11.4 'orats a%d odes.

(/efer to 2& 3++ ,*:- part *- clause :.3.;)

ll messaes e'cept %dentity verify and %dentity denied are used. The i is used as described in clause ;.,.,,.*- the

modification to 2& 3++ ,*:- part *- clause :.3.*. The /i parameter is not used and will always be coded ++++ ++++.

The codin of each field of the various messaes is specified in table ;.,.,,.8.a.

Tale 4***.a0 "odes for 2essa-es concernin- TE5 2ana-e2ent procedures

Messa-e na2e 'a(er2ana-e2ent

entit( identifier

Referencenu2er

Ri

Messa-et(pe

Action indicator Ai

7de%tit< re@uest(user to %etor)

0000 1111 ot used(ode 0)

0000 0001 $i A 0-126

7de%tit< assi%ed(%etor to user)

0000 1111 ot used(ode 0)

0000 0010 $i A 0-126 $ssi%ed T*7 a!ue

7de%tit< #e re@uest(%etor to user)

0000 1111 ot used(ode 0)

0000 0100 $i A 0-12/#e a!! T*7 a!ues

$i A 0-126T*7 a!ue to &e #eed

7de%tit< #e res"o%se(user to %etor)

0000 1111 ot used(ode 0)

0000 0101 $i A 0-126T*7 a!ue i% use

7de%tit< reoe(%etor to user)

0000 1111 ot used(ode 0)

0000 0110 $i A 0-12/Re@uest or reoa! o a!! T*7 a!ues

$i A 0-126T*7 a!ue to &e reoed

6.1.12 $utoati %eotiatio% o data !i% !a<er "araeters

(/efer to 2& 3++ ,*:- part *- clause :.8 and anne' %<)

The procedures are not supported.

6.1.13 *sta&!is#e%t "roedures(/efer to 2& 3++ ,*:- part *- clause :.:.,.*)



The timer T*+3 shall be implemented in the eDuipment on both sides of interface ?bis.

6.1.14 (S) se@ue%e error

(/efer to 2& 3++ ,*:- part *- clause :.A., and appendi' %)

s it is the case in 2& 3++ ,*:- the optional procedure for retransmission as described in ppendi' % is not supported.

6.1.15 List o s<ste "araeters

(/efer to 2& 3++ ,*:- part *- clause :.C)

ll the default values are iven in the followin clauses.

6.1.15.1 Tier T200

(/efer to 2& 3++ ,*:- part *- clause :.C.,)

The default value of timer T*++ is *8+ ms startin from the end of a transmitted frame.

&OT2E This timer depends on the timer values used for supervisin the messae flow between the Mobile !tation

(M!) and the networ". The proper operation of the procedure reDuires timer T*++ to be reater than thema'imum time between transmission of command frames and the reception of their correspondin

response or ac"nowledement frames and shorter than the shortest layer 3 timer used for supervisin thismessae flow.

6.1.15.2 Maiu %u&er o retra%sissio%s (200)

(/efer to 2& 3++ ,*:- part *- clause :.C.*)

The default value of (&*++) is 3.

6.1.15.3 Maiu %u&er o otets i% a% i%oratio% ie!d (201)

(/efer to 2& 3++ ,*:- part *- clause :.C.3)

The default and ma'imum value of (&*+,) is *;+ octets for all !P% values.

6.1.15.4 Maiu %u&er o tra%sissio% o t#e T*7 ide%tit< re@uest essae(202)

(/efer to 2& 3++ ,*:- part *- clause :.C.8)

&ot used (i.e. eDuivalent to infinity).

6.1.15.5 Maiu %u&er o outsta%di% raes (B)

(/efer to 2& 3++ ,*:- part *- clause :.C.:)

7or the !P% value + identifyin radio sinallin the default ($) value shall be *. 7or all other !P%s the value shall be

set to the fi'ed value of ,.

&OT2E The value of $ for !P% value + shall always be reater than the " value for the other !P%s.

6.1.15.6 Tier T201

(/efer to 2& 3++ ,*:- part *- clause :.C.;)

Timer T*+, shall have the default value , second.



6.1.15./ Tier T202

(/efer to 2& 3++ ,*:- part *- clause :.C.=)

The minimum time between the transmission of T2% %dentity reDuest messaes is a system parameter (T*+*) which

shall be set to ,: seconds.

6.1.15.8 Tier T203

(/efer to 2& 3++ ,*:- part *- clause :.C.A)

The timer T*+3 represents the ma'imum time allowed without frames bein e'chaned for each T2%. The value of

timer T*+3 shall be ,+ seconds.

6.1.16 ata !i% !a<er o%itor u%tio%

(/efer to 2& 3++ ,*:- part *- clause :.,+)

The supervisory function will be used in the eDuipment on both sides of the ?bis interface.

6.1.1/ Mise!!a%eous

(/efer to 2& 3++ ,*:- part *- appendi' %?%<)

The functionalities specified in appendi' %?%< of 2& 3++ ,*:- part *- is not used.



$%%e $ (i%oratie)+#a%e ?istor<

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48056-A00 - Base Station Controller - Base Transceiver Station (BSC - BTS) Interface; Layer 2 Specification