ETSI STC SMG2 Handover ad-Hoc	Tdoc 20/00
Copenhagen, Denmark, 6 - 8 March 2000                                                         Revised Tdoc RPA000025
	
CHANGE REQUEST No :	A 	Please see embedded help file at the bottom of this
page for instructions on how to fill in this form correctly.	
	
Technical Specification GSM / UMTS:	08.08	Version	8.2.0		
	
Submitted to SMG	#31bis	for approval	x	without presentation ("non-strategic")			
list plenary meeting or STC here 	for information		with presentation ("strategic")			

PT SMG CR cover form. Filename: crf26_3.doc	

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

Work item:		

Source:	Ericsson	Date: 	000303	

Subject:	Handover to UTRAN A-interface signalling	

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		
only shall be 	D	Editorial modification			Release 99	X	
marked with an X)				UMTS		

Reason for 
change:
	Provision of target cell info in Handover signalling to UTRAN for Inter System Handover 
For Inter System Handover to UMTS the Cell Identification Discriminator is set to indicate UMTS target cell.

Clauses affected:	3.2.2.27, 3.2.1.9, new chapter 3.2.2.62	

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:		

3.2.1.9	HANDOVER REQUIRED
This message is sent from the BSS to the MSC to indicate that for a given MS which already has dedicated radio resource(s) assigned, a handover is required for the reason given by the cause element.
The message is sent via the BSSAP SCCP connection associated with the dedicated resource(s).
INFORMATION ELEMENT	REFERENCE	DIRECTION	TYPE	LEN	
					
 Message Type	 3.2.2.1 	 BSS-MSC 	 M	1	
 	 	 		 	
 Cause 	 3.2.2.5 	 BSS-MSC 	 M	 3-4 	
 	 	 		 	
 Response Request	 3.2.2.28	 BSS-MSC 	 O	1	
 	 	 		 	
 Cell Identifier List	3.2.2.27 	 BSS-MSC 	 M	2n+3 	
 (Preferred) 	 	 		 to	
 	 	 		7n+3 	
 	 	 		 	
 Circuit Pool List 	 3.2.2.46	 BSS-MSC 	 O (1) 	V	
 	 	 		 	
 Current Channel Type 1 	 3.2.2.49	 BSS-MSC 	 O (2)	2	
					
 Speech Version (Used) 	 3.2.2.51	 BSS-MSC 	 O (3)	2
	
 Queueing Indicator	 3.2.2.50	 BSS-MSC 	 O	2
	
 Old BSS to New BSS Information	 3.2.2.59	BSS-MSC	O	2-n	
					
 Source RNC to Target RNC	 3.2.2.62	 BSS-MSC	O	 2-n	

1	Shall be included when cause "switch circuit pool" and the MSC allocates the A interface circuit.
2	This information element should always be included.
3	This information element should always be included when the channel mode is speech, and only in this case.
4	Source RNC to Target RNC is a general container to carry UTRAN specific information from BSS to RNC

Typical Cause values are:
				uplink quality,
				uplink strength,
				downlink quality,
				downlink strength,
				distance,
				better cell,
				response to MSC invocation,
				O&M intervention,
				directed retry,
				switch circuit pool,
				traffic,
				preemption.

3.2.2.27	Cell Identifier List
This element uniquely identifies cells and is of variable length containing the following fields:
┌─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬────────────┐
│  8     7     6     5     4     3     2     1  │            │
├─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┼────────────┤
│               Element identifier              │ octet 1    │
├───────────────────────────────────────────────┼────────────┤
│               Length                          │ octet 2    │
├───────────────────────┬───────────────────────┼────────────┤
│         Spare         │  Cell identification  │ octet 3    │
│                       │    discriminator      │            │
├───────────────────────┴───────────────────────┼────────────┤
│          Cell identification 1                │ octet 4-4+m│
├───────────────────────────────────────────────┼────────────┤
:                                               :            :
├───────────────────────────────────────────────┼────────────┤
│          Cell identification n                │ .. to 4+nm │
└───────────────────────────────────────────────┴────────────┘

The coding of octet 2 is a binary number indicating the Length of the remaining element. The Length depends on the Cell identification discriminator (bits 1 to 4 of octet 3) as well as the number of cells to be identified.
The coding of the Cell identification discriminator is a binary number indicating if the whole or a part of Cell Global identification, CGI, according to GSM 03.03 is used for cell identification of the cells in the list. The Cell identification discriminator is coded as follows: 
0000	The whole Cell Global Identification, CGI, is used to identify the cells.
0001	Location Area Code, LAC, and Cell Identify, CI, is used to identify the cells.
0010	Cell Identity, CI, is used to identify the cells.
0011	No cell is associated with the transaction.
0100	Location Area Identification, LAI, is used to identify all cells within a Location Area.
0101	Location Area Code, LAC, is used to identify all cells within a location area.
0110	All cells on the BSS are identified.
1000	UMTS Global Cell Identification, UGCI.The Cell Identification is encoded and structured according to the Service Area Identifier defined in TS 25.401. At Inter System Handover to UMTS only one cell is encoded. The UTRAN cell is uniquely identified within UTRAN

All other values are reserved.
Values 0100, 0101 and 0110 are only applicable for page message.
The coding of the Cell Identifications 1 to n (octets 4 to 4+nm) depends on the Cell identification discriminator (octet 3). Below the coding of the i-th Cell Identification is shown for each Cell identification discriminator (with "i" in the range 1 to n):
Note that no coding is specified for Cell identification discriminator values of "0011" and "0110" as no additional information is required.
Coding of the i-th Cell Identification for
Cell identification discriminator = 0000
For GSM 900 and DCS 1800:

┌─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬────────────┐
│  8     7     6     5     4     3     2     1  │            │
├─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┼────────────┤
│     MCC dig 2         │     MCC dig 1         │ octet x+1  │
├───────────────────────┼───────────────────────┼────────────┤
│  1     1     1     1  │     MCC dig 3         │ octet x+2  │
├───────────────────────┼───────────────────────┼────────────┤
│     MNC dig 2         │     MNC dig 1         │ octet x+3  │
├───────────────────────┴───────────────────────┼────────────┤
│               LAC                             │ octet x+4  │
├───────────────────────────────────────────────┼────────────┤
│               LAC cont.                       │ octet x+5  │
├───────────────────────────────────────────────┼────────────┤
│               CI value                        │ octet x+6  │
├───────────────────────────────────────────────┼────────────┤
│               CI value cont                   │ octet x+7  │
└───────────────────────────────────────────────┴────────────┘

Where  x = 3 + 7(i-1).
The octets (x+1)-(x+5) are coded as shown in GSM 04.08, Table ‘Location Area Identification information element’.

3.2.2.62	Source RNC to Target RNC Information
This information element is defined as a general container for passing (e.g. UE Capability Information) RNC specific information transparently through the core network from BSS to RNC via the MSC.
+------------------------------------------------------------+
¦  8     7     6     5     4     3     2     1  ¦            ¦
+-----------------------------------------------+------------¦
¦ Source RNC to Target RNC Information Container¦ octet 1    ¦
+-----------------------------------------------+------------¦
¦ structure and encoding is defined in relevant ¦ octet 2    ¦
+-----------------------------------------------+------------¦
¦    RANAP specification TS 25.413              ¦ octet 3-n  ¦
+------------------------------------------------------------+