9 Operational Aspects

03.533GPPService descriptionStage 2Tandem Free Operation (TFO)TS

TFO feature shall be defined so that a TFO capable TRAU should be able interact with a TFO non capable TRAU without noticeable degradation of quality. It shall be possible to roll-out TFO on part of the network.

The TFO establishment protocol shall define timers to set e.g. the negotiation message transmission time or the time needed to declare the loss of synchronisation (see subclause 6.5.3). When setting the values of these timers it should be made sure that two sets of timers at both TRAUs are consistent in order to allow TFO establishment. Given that both TRAUs may be located in different PLMN and be manufactured by different companies, most of the timers will have to be initialised at pre-defined values.

Annex A (Informative):
Change history

SMG#

SPEC

CR

PHASE

VERS

NEW_VERS

SUBJECT

03.53

30 Sept 1996

0.0.0

Draft proposal

03.53

25 Nov 1996

0.0.0

Draft proposal after comments

03.53

27 Jan 1997

0.0.1

Version 0.0.0 has been presented to SMG3/WPA and joint SMG3/SMG11 in dec. 96. No comments were made.

Only change is editorial on official TS GSM reference

03.53

29 June 1997

0.0.2

Changes reflecting the last decisions in SMG11.

03.53

18 Aug 1997

0.1.0

Changes reflecting the decisions in SMG11 TFO #6

– format of the messages
– applicable to different systems
– transparency principle for transmission equipments.

03.53

01 Aug 1997

0.1.1

Changes reflecting the review in SMG11 TFO #8 in Bois D’Arcy

– transparency of IPEs can be for 1 up to 8 bits
– no fixed pattern is used for the 6 MSB
– informative annex on IPE is added

03.53

08 Oct 1997

0.2.0

Clarifications reflecting SMG11/TFO in Bois D’Arcy and SMG11 in Le Mans

Incorporation of comments received by e-mail.

Version for presentation to SMG3/SA

03.53

08 Nov 1997

0.3.0

Addition of some text regarding the main concept, handover management, UFE bit management, interaction with Supplementary services.

03.53

08 Dec 1997

1.0.0

Presented to SMG. The presented version was approved in SMG3/SA, but since it was not seen by SMG3, it was requested that it is presented again to SMG3, and was then only presented to SMG for information.

SMG#

SPEC

CR

PHASE

VERS

NEW_VERS

SUBJECT

S29

03.53

R98

7.0.0

Release 1998 version (new)

S31

03.53

R99

8.0.0

Release 1999 version (new)

Document rapporteur:

Denis Fauconnier

Nortel

+ 33 1 39 44 52 87

e-mail: denis.fauconnier.dfauconn@nortel.com