ETSI SMG12 	Tdoc SMG12 C-99-455
Sophia Antipolis, France
26 May, 1999

CHANGE REQUEST No :	A 004 r0	Please see embedded help file at the bottom of this
page for instructions on how to fill in this form correctly.	
	
Technical Specification GSM	03.73	Version:	7.0.0		
	
Submitted to SMG	12	for approval	X	without presentation ("non-strategic")			
list SMG plenary meeting no. here 	for information		with presentation ("strategic")	X		

PT SMG CR cover form is available from: http://docbox.etsi.org/tech-org/smg/Document/smg/tools/CR_form/crf28_1.zip	

Proposed change affects:	SIM		ME		Network	X	
(at least one should be marked with an X)

Work item:	SoLSA	

Source:	Ericsson	Date: 	990518	

Subject:	Inter-working between SoLSA and GPRS 	

Category: 	F	Correction		Release: 	Phase 2		
	A	Corresponds to a correction in an earlier release			Release 96		
(one category 	B	Addition of feature	X		Release 97		
and one release 	C	Functional modification of feature			Release 98	X	
only shall be 	D	Editorial modification			Release 99		
marked with an X)						

Reason for 
change:
	SGSN may need to send LSA information to the BSS in order for the BSS to determine specific cell selection parameters for the mobile station. 

Clauses affected:	5, 11.7.1 and A.2	

Other specs	Other releases of same spec		  List of CRs:		
affected:	Other core specifications		  List of CRs:		
	MS test specifications / TBRs		  List of CRs:		
	BSS test specifications		  List of CRs:		
	O&M specifications		  List of CRs:		

Other 
comments:		

5.	General architecture
No specific requirements are identified. The general architecture of GSM is maintained.

Figure 1: General architecture
11.7.1	MS connection establishment
11.7.1.1	Indication of current LSA to the MSC
At initial connection establishment the BSS shall inform the MSC about the LSA ID(s) of the cell where the initial layer 3 message was received. This is done by adding the LSA ID(s) of current cell to the complete layer 3 message.
11.7.1.2	Indication of allowed LSA to the BSS
The MSC sends the  LSA information message to the BSS including the A-interface LSA information of the connection as defined in GSM 08.08. The MSC maps the subscription LSA information on to the A-interface LSA information for LSAs requiring ‘active mode support’. The LSA information sent to the BSS indicates the allowed area for the MS connection. The BSS shall store the LSA information in order to use it on later actions, e.g. at handover.
The LSA information for the MS connection shall be used in the BSS at assignment of radio resources in order to e.g. prioritise cells in the allowed LSA(s) and to prevent allocating resources in cells outside the allowed area for the MS connection.
11.7.1.3	Indication of allowed LSA to the BSS
The SGSN may send the LSA information message to the BSS for a mobile station in ready mode as defined in GSM 08.18. The SGSN sends the subscription LSA information for LSAs requiring ‘active mode support’. The LSA information sent to the BSS indicates the allowed area for the MS connection. The BSS shall store the LSA information in order to use it on later actions, e.g. when determine specific cell selection parameters.
The LSA information for the MS connection shall be used in the BSS to e.g. prioritise cells in the allowed LSA(s) and to prevent allocating resources in cells outside the allowed area for the MS connection.
A.2	Network Architecture

Figure A1: NW architecture including SoLSA related enhancements on CAMEL Service Environment