Title:                   Re-use of Transport 
PDR Reference:                     99010002 
Originator Reference:              ULCS-99-01
SARPs Document Reference:     4.4.3.1 (row S.A.6.2/2 of Table 4.4-3) 
Status:                       WITHDRAWN
Impact:                       n/a
PDR Revision Date:            19/04/99 (WG3/SG3 meeting) 
PDR Submission Date:               08/01/99
Submitting State/Organisation:     Open Network Solutions, Inc. (USA) 
Submitting Author Name:       Moulton, James
Submitting Author E-mail Address:  moulton@ons.com 
Submitting Author Supplemental Contact Information:
                    22636 Glenn Dr Suite 305
                    Sterling, VA 20164 USA
SARPs Date:                   DOC 9705 
SARPs Language:               English 
Summary of Defect:
The PRL for the Session Layer includes the reuse of transport connections 
as Optional (as per ISO 8073).  However when using the efficiency 
enhancements, reuse of transport should never be used since the binding of 
an application to the session protocol does not have sufficient addressing 
information.
The reuse of transport connections should be prohibited in all cases except 
AMHS.
     
Assigned SME:                 SME 4 (A. Kerr) 
Proposed SARPs amendment:
     Modify entry S.A.6.2/2 from O to X
     
SME Recommendation to CCB:    REJECT
WG3/SG3 meeting in Toulouse, Jan 99 concluded that a TC could be re-used if 
the initial S-connection is refused.  In all other cases, the transport 
connection is taken down when the association ends (the session connection 
is aborted, hence T-DISCONNECT), so there is no TC available for re-use 
anyway.  Propose to REJECT the PDR.
Discussion at CCB-8 (Honolulu) meeting.  Originator maintains there is a 
real defect.  However, there are known implementations which have 
successfully re-used TCs in the case where a TC is established but UL 
connection fails.  The collision case needs to be looked at.  The PDR needs 
further discussion on the SME4 list.  S. Van Trees actioned to check 
Session efficiency enhancements.  J. Moulton actioned to clarify the 
defect.
WG3/SG3 meeting in Palo Alto, Apr 99.  Withdrawn by originator.  Superseded 
by 99040003.
     
CCB Decision:       n/a (WITHDRAWN)