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):
30 Sept 1996
25 Nov 1996
Draft proposal after comments
27 Jan 1997
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
29 June 1997
Changes reflecting the last decisions in SMG11.
18 Aug 1997
Changes reflecting the decisions in SMG11 TFO #6
– format of the messages
01 Aug 1997
Changes reflecting the review in SMG11 TFO #8 in Bois D’Arcy
– transparency of IPEs can be for 1 up to 8 bits
08 Oct 1997
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
08 Nov 1997
Addition of some text regarding the main concept, handover management, UFE bit management, interaction with Supplementary services.
08 Dec 1997
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.
Release 1998 version (new)
Release 1999 version (new)
+ 33 1 39 44 52 87