ETSI STC SMG12 	Tdoc SMG12 C-99-457
Sophia Antipolis, France
26 May, 1999

CHANGE REQUEST No :	A 006 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	X	Network	X	
(at least one should be marked with an X)

Work item:	SoLSA	

Source:	Ericsson	Date: 	990520	

Subject:	Addition of functionality for support of exclusive access.	

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:
	An exclusive access cell is indicated by a flag in system information. This will prevent MSs without subscription to that cell to camp on it. An escape PLMN is included for old MSs that do not understand the exclusive access flag. Such an MS will consider the cell as belonging to another PLMN. In order to support this solution the MS has to indicate whether it supports SoLSA or not and the LSA ID(s) of current cell need to be sent to the MSC at location/routing area update.	

Clauses affected:	3.1, 4.5.3, 4.5.5 (new), 6, 11.4.1, 11.4.2, 11.4.3 (new), 11.4.4 (new), 11.9	

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:		

3.1	Definitions
For the purposes of the present document, the following definitions apply:
Allowed localised service area: A Localised Service Area where the subscriber has allowed service.
Current localised service area: The Localised Service Area of the serving cell to which the mobile station has subscription.  
Escape PLMN: A specific PLMN code that may be broadcast for non SoLSA compatible mobile stations that do not understand the exclusive access indicator. The value of the escape PLMN code is MCC = 901 and MNC = 08.
Localised Service Area: A Localised Service Area consists of a cell or a number of cells. The cells constituting a LSA may not necessarily provide continuous coverage.
Network operator: Entity that provides the network operating elements and resources for the execution of the LSA service.
Service provider: Entity that offers the LSA services for subscription. The network operator may be the service provider.
Service subscriber: Mobile subscriber, which subscribes to the LSA service. In principle, if a network provides LSA service, all users are able to subscribe to this service.
4.5.3	Location Registration
. The MSC/VLR shall reject a location registration if the cell is used for exclusive access and none of the LSA IDs of current cell corresponds to the LSA ID(s) stored in the subscriber record.
4.5.5	Routing Area Update
SGSN shall reject a routing area update if the cell is used for exclusive access and none of the LSA IDs of current cell corresponds to the LSA ID(s) stored in the subscriber record.
6.	Compatibility issues
LSA can not be used with standard phase 1 or phase 2 mobile stations (or with non-compatible phase 2+ mobile stations) with all service aspects. A dedicated mobile station with LSA capability is required.
A compatible mobile station shall provide the following specific functions:
-	cell reselection in case of a LSA subscription;
-	notification of the current LSA.
A mobile station with LSA capability shall also provide the complete functionality in order to allow the use of phase 2 services.
Standard phase 1 and phase 2 mobile stations in a network shall not be impacted by the presence of LSA services in that network due to LSA signalling, also if the mobile station is operated with a SIM that contains SoLSA fields.
However, if LSA is provided in a network, it can be applied to non-compatible mobile stations in the following way:
-	For a user with a LSA service subscription and with LSA only access, the network rejects connection attempts made outside the allowed LSA(s). Emergency calls are however always allowed.
-	For a user with a LSA service subscription, support is given for LSAs in active mode, with exception of the notification (LSA indication). 
6.1	Handling of mobiles in exclusive access cells
 An escape PLMN may be included for old MSs that do not understand the exclusive access indicator. Such an MS will consider the cell as belonging to another PLMN. If the escape PLMN is broadcast and the subscriber is not allowed within the cell, the receiving MSC/VLR/SGSN shall reject the location update with the cause PLMN not allowed. The escape PLMN will be added to the list of forbidden PLMNs and not accessed again. SoLSA compatible mobile stations will however read the correct PLMN in the system information and treat the cell as normal.
11.4.1	Broadcast information
In cells belonging to a LSA, the LSA ID(s) and/or cell identity is broadcast.
Further, in cells belonging to a LSA, which shall give exclusive access to a subscriber group, an exclusive access indication is broadcast.
To be able to favour the LSA cells at cell reselection new LSA reselection parameters are broadcast.
11.4.2	Cell selection and reselection
The definition of a “suitable cell”, as defined in GSM 03.22, is modified with the following criterion: 
A SoLSA exclusive access cell is “suitable” only if the LSA of the cell is one of the allowed LSA according to the SIM. Emergency calls are always allowed if no cells are found suitable. 
An MS with SIM indicating LSA subscription shall always try to reselect the cell with the highest LSA priority according to the information stored on the SIM. The LSA reselection parameters broadcast on the BCCH shall be used to calculate the reselection criteria. The broadcasting mechanism is as described in GSM 04.08 and GSM 04.60. The MS shall follow the reselection procedures defined in GSM 05.08.
NOTE: The text above covers also the case when the MS is using GPRS together with SoLSA.
11.4.3	Location Updating
If the escape PLMN is broadcast the BSS shall, at location updating, inform the MSC/VLR about the LSA ID(s) of the cell where the location updating request message was received. This is done by adding the LSA ID(s) of current cell to the complete layer 3 information message for the exclusive access cell.
11.4.4	Routing Area Update
If the escape PLMN is broadcast the BSS shall, at routing area update, inform the SGSN about the LSA ID(s) of the cell where the routing area update request message was received. This is done by adding the LSA ID(s) of current cell to the UL UNITDATA message for the exclusive access cell.
11.9	Overview of signalling
In this overview, the messages required to implement the specified concept are identified and brief details are given of each message. These signalling flows are not normative, but provided as an illustration on possible signalling interworking (note that only those parts of the procedures that are relevant for the LSA service are included). 

Figure 2: Signalling information required at location registration
LOCATION_UPDATING_REQUEST: Standard message.
COMPLETE_LAYER3_INFORMATION: If the escape PLMN is broadcast, the MSC is provided with location updating information together with the LSA ID(s) of current cell.
MAP_UPDATE_LOCATION_AREA: Standard message.
MAP_INSERT_SUBSCRIBER_DATA: The VLR is provided with the subscriber information including the allowed LSA ID(s), priority of each LSA and the LSA only access indicator of current PLMN.

Figure 3: Signalling information required at routing area update
ROUTING_AREA_UPDATE_REQUEST: Standard message.
UPLINK_UNITDATA: If the escape PLMN is broadcast, the SGSN is provided with routing area update information together with the LSA ID(s) of current cell.
MAP_UPDATE_LOCATION_AREA: Standard message.
MAP_INSERT_SUBSCRIBER_DATA: The SGSN is provided with the subscriber information including the allowed LSA ID(s), priority of each LSA and the LSA only access indicator of current PLMN.

Figure 4: Signalling information required at updating of the subscriber’s LSA information by using SMS
MT-SHORT-MESSAGE, MAP-MT-FORWARD-SHORT-MESSAGE request, SM TP SMS-DELIVER: Standard messages containing subscriber's LSA information and are parts of SIM data download.
SM TP SMS-DELIVER acknowledgement, MAP-MT-FORWARD-SHORT-MESSAGE response: Standard messages containing result of the operation.

Figure 5: Signalling information required for mobile originating call establishment
SYSTEM_INFO: The network provides the cell identity and/or LSA ID(s) of the cell, LSA cell reselection parameters and the exclusive access indication.
Initial RACH CHANNEL_REQUEST: Standard message.
IMMEDIATE_ASSIGNMENT: Standard message.
SABM (SERV_REQ): Standard message.
UA (SERV_REQ): Standard message.
COMPLETE_LAYER3_INFORMATION: The MSC is provided with initial information about the requested service together with the LSA ID(s) of current cell.
CM_SERVICE_ACCEPT: Standard message. The service request is acknowledged. Acknowledgement of the service can also be performed by invocation of ciphering mode setting.
SETUP: Standard message.
CALL_PROCEEDING: Standard message.
LSA INFO: New message including the allowed LSA ID(s), priority of each LSA and an indication about the access rights outside these LSA(s) for the service subscriber. This message needs to be sent before Assignment request. Additional messages may be sent anytime during the lifetime of a call.
ASSIGNMENT_REQUEST: Standard message.
ASSIGNMENT_COMMAND: Standard message.
SABM: Standard message.
UA: Standard message.
ASSIGNMENT_COMPLETE: Standard message.
A_ASSIGNMENT_COMPLETE: Modified assignment complete including the LSA ID of current cell.

Figure 6: Signalling information required at BSS external handover initiation
HANDOVER REQUIRED: Standard message.
MAP_PREPARE_HANDOVER: Standard message. Including the modified handover request.
HANDOVER_REQUEST: Modified handover request including the allowed LSA ID(s), priority of each LSA and an indication about the access rights outside these LSA(s).

Figure 7: Signalling information required at BSS external handover acknowledgement
HANDOVER_REQUEST_ACKNOWLEDGE: Modified handover request acknowledge including the LSA ID of current cell.
MAP_PROCESS_ACCESS_SIGNALLING request: Standard message. Including the modified handover request acknowledge.

Figure 8: Signalling information required at BSS internal handover
HANDOVER_COMPLETE: Standard message.
HANDOVER _PERFORMED: Modified handover performed including the LSA ID of current cell.
MAP_PROCESS_ACCESS_SIGNALLING request: Standard message. Including the modified handover performed.

Figure 9: Signalling information required at notification of LSA change in active mode
MM_INFORMATION: Modified MM-INFORMATION message including the LSA ID of current cell.