ETSI STC SMG2 
Handover ad-Hoc	Document	2B30/00	
Copenhagen, Denmark
6 - 8 March 2000		e.g. for 3GPP use the format  TP-99xxx 
or for SMG, use the format  P-99-xxx	

CHANGE REQUEST	Please see embedded help file at the bottom of this
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	05.08	CR	A242
rev 2	Current Version:	8.3.0		
					
GSM (AA.BB) or 3G (AA.BBB) specification number 		 CR number as allocated by MCC support team	
	
For submission to: 		for approval			strategic		(for SMG	
list expected approval meeting # here 	for information			non-strategic		use only)	
			
Form: CR cover sheet, version 2 for 3GPP and SMG        The latest version of this form is available from: ftp://ftp.3gpp.org/Information/CR-Form-v2.doc	
	
Proposed change affects:	(U)SIM		ME	x	UTRAN / Radio	x	Core Network		
(at least one should be marked with an X)	
	
Source:	Ericsson	Date: 	2000-03-03	
	
Subject:	Inter System Handover and Cell re-selection	
	
Work item:	Handover GSM<->UMTS	
	
Category: 	F	Correction		Release: 	Phase 2		
	A	Corresponds to a correction in an earlier release			Release 96		
(only one category 	B	Addition of feature	x		Release 97		
shall be marked	C	Functional modification of feature			Release 98		
with an X)	D	Editorial modification			Release 99	x	
				Release 00		
	
Reason for 
change:
	Procedure description for Inter System handover and Intersystem cell re-selection

Clauses affected:	2, 3.4, 6.6, 7.2, 8, 8.4.1, 8.4.2, 8.4.7 (new), 8.4.8 (renumbered), 8.4.8.1, 8.4.8.2, 10.1, 10.1.1, 10.1.4, 10.1.4.1, 10.1.4.2 	
	
Other specs	Other 3G core specifications		  List of CRs:		
affected:	Other GSM core specifications		  List of CRs:		
	MS test specifications		  List of CRs:		
	BSS test specifications		  List of CRs:		
	O&M specifications		  List of CRs:		
	
Other 
comments:		

2	General
The radio sub‑system link control aspects that are addressed are as follows:
‑	Handover;
‑	RF Power control, including fast power control for ECSD;
‑	Radio link Failure;
‑	Cell selection and re‑selection in Idle mode, in Group Receive mode and in GPRS mode (see GSM 03.22);
-	CTS mode tasks.
Handover is required to maintain a call in progress as a MS engaged in a point‑to‑point call or with access to the uplink of a channel used for a voice group call passes from one cell coverage area to another and may also be employed to meet network management requirements, e.g. relief of congestion.
Handover may occur during a call from one TCH or multiple TCHs (in the case of multislot configuration) to another TCH or multiple TCHs. It may also occur from DCCH to DCCH or from DCCH to one or multiple TCH(s), e.g. during the initial signalling period at call set‑up.
The handover may be either from channel(s) on one cell to other channel(s) on a surrounding cell, or between channels on the same cell which are carried on the same frequency band. Examples are given of handover strategies, however, these will be determined in detail by the network operator.
For a multiband MS, specified in GSM 02.06, the handover described is also allowed between any channels on different cells which are carried on different frequency bands, e.g. between a GSM 900/TCH and a DCS 1 800/TCH. Handover between two co‑located cells, carried on different frequency bands, is considered as inter‑cell handover irrespective of the handover procedures used.
For a multimode MS, handover is allowed between GSM and other radio access technologies. This type of handover involves termination of the GSM connection and establishment of a new connection within the other radio access technology.
Adaptive control of the RF transmit power from an MS and optionally from the BSS is implemented in order to optimize the uplink and downlink performance and minimize the effects of co‑channel interference in the system.
The criteria for determining radio link failure are specified in order to ensure that calls which fail either from loss of radio coverage or unacceptable interference are satisfactorily handled by the network. Radio link failure may result in either re‑establishment or release of the call in progress. For channels used for a voice group call, an radio uplink failure results in the freeing up of the uplink.
Procedures for cell selection and re‑selection whilst in Idle mode (i.e. not actively processing a call), are specified in order to ensure that a mobile is camped on a cell with which it can reliably communicate on both the radio uplink and downlink. The operations of an MS in Idle Mode are specified in GSM 03.22.
Cell re-selection is also performed by the MS when attached to GPRS, except when the MS simultaneously has a circuit switched connection. Optional procedures are also specified for network controlled cell re-selection for GPRS. Cell re-selection for GPRS is defined in subclause 10.1.
For a multimode MS, cell selection and re-selection is allowed between GSM and other radio access technologies. 
An MS listening to a voice group call or a voice broadcast use cell re‑selection procedures to change cell. This may be supported by a list of cells carrying the voice group or voice broadcast call downlink, provided to the MS by the network. The operations of an MS in Group Receive Mode are specified in GSM 03.22.
Information signalled between the MS and BSS is summarized in tables 1, 2 and 3. A full specification of the Layer 1 header is given in GSM 04.04, and of the Layer 3 fields in GSM 04.08.
For CTS, information signalled between the CTS-MS and CTS-FP is summarized in tables 4, 5 and 6. A full specification of the CTS Layer 3 fields is given in GSM 04.56.
For COMPACT, specific procedures are defined in clause 12.
	***   Next modified section   ***
3.4	Strategy
The handover strategy employed by the network for radio link control determines the handover decision that will be made based on the measurement results reported by the MS/BSS and various parameters set for each cell. Network directed handover may also occur for reasons other than radio link control, e.g. to control traffic distribution between cells. The exact handover strategies will be determined by the network operator, a detailed example of a basic overall algorithm appears in annex A. Possible types of handover are as follows:
Inter‑cell handover:
	Intercell handover from the serving cell to a surrounding cell will normally occur either when the handover measurements show low RXLEV and/or RXQUAL on the current serving cell and a better RXLEV available from a surrounding cell, or when a surrounding cell allows communication with a lower TX power level. This typically indicates that an MS is on the border of the cell area.
	Intercell handover may also occur from the DCCH on the serving cell to a TCH or multislot configuration on another cell during call establishment. This may be used as a means of providing successful call establishment when no TCH resource is available on the current serving cell.
	Inter‑cell handover between cells using different frequency bands is allowed for a multi band MS.
Intra‑cell handover:
	Intra‑cell handover from one channel/timeslot in the serving cell to another channel/timeslot in the same cell will normally be performed if the handover measurements show a low RXQUAL, but a high RXLEV on the serving cell. This indicates a degradation of quality caused by interference even though the MS is situated within the serving cell. The intra‑cell handover should provide a channel with a lower level of interference. Intra‑cell handover can occur either to a timeslot on a new carrier or to a different timeslot on the same carrier. Similarly, intra‑cell handover may occur between different multislot configurations in the same cell. These multislot configurations may comprise different number of timeslots and may partly overlap.
	Intra-cell handover from one of the bands of operation to another one is allowed for a multiband MS.
Inter-radio access technology handover:
	Handover of a multimode MS from a GSM serving cell to an alternate radio access technology (RAT) will normally be performed when the signal quality measurements on the alternate RAT indicate a better cell then the serving cell.
	Handover may also occur from the DCCH on the GSM serving cell to an alternate RAT. 
GSM 08.08 defines the causes for handover that may be signalled from BSS to MSC.
	***   Next modified section   ***
6.6	Measurements for Cell Reselection
Upon completion of cell selection and when starting the cell reselection tasks, the MS shall synchronize to and read the BCCH information for the 6 strongest non‑serving carriers (in the BA) as quickly as possible within the times specified in subclause 6.6.1. For multi band MSs the strongest non‑serving carriers may belong to different frequency bands. If system information message type 2 ter is used in the serving cell, and the MS has decoded all relevant serving cell BCCH data, except system information message 2 ter, then the MS shall start cell reselection measurements based on the know part of the BA, until system information message 2 ter is decoded and the full BA can be used.
For a multimode MS, the network controls the reselection measurements of other radio access technologies by parameters that are broadcast on BCCH. These measurements may be performed less frequently than measurements of GSM, in order to conserve MS power. For details, refer to 3GPP TS 25.304. 
MSs supporting SoLSA with SoLSA subscription shall perform cell re-selection according to subclause 6.6.3. Other MSs shall perform cell re-selection according to subclause 6.6.2.
6.6.1	Monitoring of received signal level and BCCH data
Whilst in idle mode an MS shall continue to monitor all BCCH carriers as indicated by the BCCH allocation (BA ‑ See table 1). A running average of received signal level (RLA_C) in the preceding 5 to:
Max {5 , ((5 * N + 6) DIV 7) * BS_PA_MFRMS / 4}
seconds shall be maintained for each carrier in the BCCH allocation. N is the number of non‑serving cell BCCH carriers in BA and the parameter BS_PA_MFRMS is defined in GSM 05.02.
The same number of measurement samples shall be taken for all non‑serving cell BCCH carriers of the BA list, and the samples allocated to each carrier shall as far as possible be uniformly distributed over each evaluation period. At least 5 received signal level measurement samples are required per RLA_C value. New sets of RLA_C values shall be calculated as often as possible.
For the serving cell, receive d signal level measurement samples shall be taken at least for each paging block of the MS. The RLA_C shall be a running average determined using samples collected over a period of 5 s to Max {5s, five consecutive paging blocks of that MS}. The samples shall as far as possible be uniformly distributed over each evaluation period. At least 5 received signal level measurement samples are required per RLA_C value. New RLA_C values shall be calculated as often as possible.
The list of the 6 strongest non‑serving carriers shall be updated at least as often as the duration of the running average defined for measurements on the BCCH allocation and may be updated more frequently.
In order to minimize power consumption, MS that employ DRX (i.e. power down when paging blocks are not due) should monitor the received signal levels of non‑serving cell BCCH carriers during the frames of the paging block that they are required to listen to. The MS shall include the BCCH carrier of the current serving cell (i.e. the cell the MS is camped on) in this measurement routine. Received signal level measurement samples can thus be taken on several non‑serving cell BCCH carriers and on the serving carrier during each paging block.
The MS shall attempt to decode the full BCCH data of the serving cell at least every 30 seconds.
The MS shall attempt to decode the BCCH data block that contains the parameters affecting cell reselection for each of the 6 strongest non‑serving cell BCCH carriers at least every 5 minutes. When the MS recognizes that a new BCCH carrier has become one of the 6 strongest, the BCCH data shall be decoded for the new carrier within 30 seconds.
The MS shall attempt to check the BSIC for each of the 6 strongest non‑serving cell BCCH carriers at least every 30 seconds, to confirm that it is monitoring the same cell. If a change of BSIC is detected then the carrier shall be treated as a new carrier and the BCCH data re-determined.
In addition, an MS supporting SoLSA with SoLSA subscription shall attempt to decode BSIC and the BCCH data blocks that contain the parameters affecting SoLSA cell reselection for the 6 strongest carriers, which are included both in the BCCH allocation and in the BA_PREF as received in the latest CHANNEL RELEASE message (see 04.08). At least one carrier shall be searched every 5 minutes, one after another. In the case the MS has been able to decode the BCCH data blocks, the rules described in 6.6.3 shall be followed.
When requested by the user, the MS shall determine which PLMNs are available (Manual Mode) or available and allowable (Automatic Mode) (see GSM 03.22) within 10 seconds (for GSM 450), 10 seconds (for GSM 480), 15 seconds (for GSM 850 and GSM 900) or 20 seconds (for DCS 1 800 and PCS 1 900). A multi band MS shall perform the same procedures in all bands of operation within the sum of time constraints in the respective band of operation.
In both cases, this monitoring shall be done so as to minimize interruptions to the monitoring of the PCH.
The maximum time allowed for synchronization to a BCCH carrier is 0,5 s, and the maximum time allowed to read the BCCH data, when being synchronized to a BCCH carrier, is 1,9 s. An exception is allowed for system information messages that are broadcast only once every nth (n>1) occurrence of the 8 multiframes (see GSM 05.02). For these system information messages the allowed decoding time is extended according to the applied scheduling of the system information broadcast, i.e. n*1.9 s.
	***   Next modified section   ***
7.2	Identification of surrounding BSS for handover measurements
It is essential for the MS to identify which surrounding BSS is being measured in order to ensure reliable handover. Because of frequency re‑use with small cluster sizes, the BCCH carrier frequency may not be sufficient to uniquely identify a surrounding cell, i.e. the cell in which the MS is situated may have more than one surrounding cell using the same BCCH frequency. Thus it is necessary for the MS to synchronize to and demodulate surrounding BCCH carriers and identify the base station identification code (BSIC). The MS shall be able to perform this task at levels down to the reference sensitivity level or reference interference levels as specified in GSM 05.05.
The MS shall use at least 4 spare frames per SACCH block period for the purpose of decoding the BSICs (e.g. in the case of TCH/F, the four idle frames per SACCH block period). These frames are termed "search" frames.
A 6 bit Base Station Identity Code (BSIC), as defined in GSM 03.03, shall be transmitted on each BCCH carrier. The PLMN part of the BSIC can be regarded as a "PLMN colour code".
The MS shall attempt to demodulate the SCH on the BCCH carrier of as many surrounding cell s as possible, and decode the BSIC as often as possible, and as a minimum at least once every 10 seconds. The MS shall give priority for synchronisation attempts in signal strength order and considering the Multiband Reporting parameter. A list containing information about the timing of the surrounding cells at the accuracy required for accessing a cell (see GSM 05.10) including the absolute times derived from the parameters T1, T2, T3 shall be kept by the MS. This information may be used to schedule the decoding of BSIC and shall be used in connection with handover in order to keep the switching time at a minimum. The network may provide Real Time Difference (RTD, see GSM 05.10) to assist the MS in neighbour cell synchronisation attempts. This assistance data is included in the MEASUREMENT INFORMATION message (See 04.18). The MS may use other assistance data too, if received elsewhere, e.g. for position services received information. The actual number of carriers the MS is capable of synchronising to and decoding the BSIC every 10 seconds, depends on the Observed Time Difference (OTD, see 05.10) for each neighbour cell and the availability of the assistance information.
If, after averaging measurement results over 2 SACCH block periods, the MS detects one or more BCCH carriers, among the 6 strongest, whose BSICs are not currently being assessed, then the MS shall as a matter of priority attempt to decode their BSICs.
In the case of a multi band MS, the MS shall attempt to decode the BSIC, if any BCCH carrier with unknown BSIC is detected among the number of strongest BCCH carriers in each band as indicated by the Multiband Reporting parameter.
Thus an MS shall, for a period of up to 5 seconds, devote all search frames to attempting to decode these BSICs. If this fails then the MS shall return to confirming existing BSICs. Having re‑confirmed existing BSICs, if there are still BCCH carriers, among the six strongest, with unknown BSICs, then the decoding of these shall again be given priority for a further period of up to 5 seconds.
The MS shall report a new strongest GSM cell in the measurement report at the latest 5 s after a new strongest cell (which is part of the BA(SACCH)) has been activated under the following network conditions: Initial serving cell at RXLEV= -70 dBm, with 6 neighbours at RXLEV= -75 dBm. Then the new BCCH carrier is switched on at RXLEV= -60 dBm.
NOTE:	Because of test equipment limitations it is acceptable to activate the new carrier to replace one of the 6 neighbours.
A multi mode MS may use the search frames, which are not required for BSIC decoding, to identify and measure cells belonging to other radio access technologies. For details and requirements, refer to 3GPP TS 25.133. The MS shall report a new best UTRAN (FDD or TDD) cell (which is part of the neighbour cell list) at the latest 5 seconds after it has been activated under the condition that there is only one UTRAN frequency in the neighbour cell list and that no new GSM cells are activated at the same time. The allowed reporting time is increased by 5 seconds for each alternative RAT frequency in the neighbour list and by the time required for BSIC decoding of new activated GSM cells. However, multiple UTRAN cells on the same frequency in the neighbour cell list does not increase the allowed reporting time.
If either no BSIC can be demodulated on a surrounding cell BCCH carrier, or the NCC part of the BSIC is not one of the permitted NCCs, then the received signal level measurements on that channel shall be discarded. The permitted NCCs are defined by the NCC_PERMITTED parameter transmitted in the BCCH data. This is an 8 bit map that relates to the NCC part of BSIC. (e.g. NCC_PERMITTED = 01101001, defines that only carriers having a BSIC with the NCC part = 000, 011, 101,110 shall be reported).
If a change of BSIC is detected on a carrier, then any existing received signal level measurement shall be discarded and a new averaging period commenced. This occurs when the MS moves away from one surrounding cell and closer to another co‑channel cell.
If the BSIC cannot be decoded at the next available opportunities re‑attempts shall be made to decode this BSIC. If the BSIC is not decoded for more than three successive attempts it will be considered lost and any existing received signal level measurement shall be discarded.
Details of the synchronization mechanisms appear in GSM 05.10. The procedure for monitoring surrounding BTS with respect to HO measurement shall begin at least at the time of assignment of a dedicated channel.
When a BCCH carrier is found to be no longer among the reported, timing and BSIC information shall be retained for at least 10 seconds. (This is in case a handover is commanded to this cell just after the MS stops reporting RXLEV and RXQUAL on this cell).
	***   Next modified section   ***
8	Radio link measurements
Radio link measurements are used in the handover and RF power control processes.
In particular, radio‑subsystem directed handover is defined as a change of channel(s) during a call either because of degradation of the quality of one or more of the current serving channel(s), or because of the availability of other channel(s) which can allow communication at a lower TX power level, or to prevent a MS grossly exceeding the planned cell boundaries.
Additional measurements, so called Extended measurements, can e.g. be used for frequency planning purposes.
The measurements are made over each SACCH multiframe, which is 104 TDMA frames (480 ms) for a TCH and 102 TDMA frames (470,8 ms) for an SDCCH. Additionally, when in E-TCH mode, quality measurements shall also be made over each FPC reporting period.
For a multi mode MS, measurements on other radio access technologies may be performed during search frames that are not required for BSIC decoding. For details and requirements, refer to 3GPP TS 25.133.

	***   Next modified section   ***
8.4	Measurement reporting
8.4.1	Measurement reporting for the MS on a TCH
For a TCH, the reporting period of length 104 TDMA frames (480 ms) is defined in terms of TDMA frame numbers (FN) as follows:
Timeslot number (TN)
	TDMA frame number (FN) modulo 104
	
TCH/F 	TCH/H,subch.0	TCH/H,subch.1	Reporting period	SACCH Message block	
0	0 and 1		0 to 103	12, 38, 64, 90	
1		0 and 1	13 to 12	25, 51, 77, 103	
2	2 and 3		26 to 25	38, 64, 90, 12	
3		2 and 3	39 to 38	51, 77, 103, 25	
4	4 and 5		52 to 51	64, 90, 12, 38	
5		4 and 5	65 to 64	77, 103, 25, 51	
6	6 and 7		78 to 77	90, 12, 38, 64	
7		6 and 7	91 to 90	103, 25, 51, 77	

For a multislot configuration, the reporting period and SACCH Message block for each timeslot is defined as for TCH/F for TN = 0.
When on a TCH, the MS shall assess during the reporting period and transmit to the BSS in the next SACCH message block the following:
‑	RXLEV for the BCCH carrier of the 6 cells with the highest RXLEV among those with known and allowed NCC part of BSIC. For a multi band MS the number of cells, for each frequency band supported, which shall be included is specified in subclause 8.4.3. For a cell of other radio access technology, RXLEV is replaced by the relevant mapped quality measure for that radio access technology. 
NOTE 1:	Since there are 104 TDMA frames in each SACCH multiframe (and measurement in 4 frames is optional), the number of samples on each BCCH carrier will depend on the number of carriers defined in the BCCH Allocation (BA) and may be different. The following table gives examples of this.
Number of BCCH carriers	Number of samples per	
in BCCH Allocation	carrier in SACCH multiframe	
32	3‑4	
16	6‑7	
10	10‑11	
8	12‑13	
:	:	
:	:	

	These figures are increased if the MS is able to make measurements on more than one BCCH carrier during each TDMA frame.
‑	RXLEV_FULL and RXQUAL_FULL:	
RXLEV and RXQUAL for the full set of TCH and SACCH TDMA frames. The full set of TDMA frames is either 100 (i.e. 104 ‑ 4 idle) frames for a full rate TCH or 52 frames for a half‑rate TCH.
‑	RXLEV_SUB and RXQUAL_SUB:	
RXLEV and RXQUAL for the subset of 4 SACCH frames and the SID TDMA frames/L2 fill frames defined in 8.3. In case of data traffic channels TCH/F9.6, TCH/F4.8, TCH/H4.8 and TCH/H2.4, the RXQUAL_SUB report shall include measurements on the TDMA frames given in the table of subclause 8.3 only if L2 fill frames have been received as FACCH frames at the corresponding frame positions. If no FACCH frames have been received at the corresponding frame positions, the RXQUAL_SUB report shall include measurements on the 4 SACCH frames only. The performance requirements of subclause 8.2.4 do not apply in this case for RXQUAL_SUB. In case of half rate speech channel TCH/HS, if an SID frame or a speech frame as defined in subclause 8.3 is replaced by an FACCH frame, the RXQUAL measurement on these frames shall be excluded from the RXQUAL SUB report. The performance requirements of subclause 8.2.4 do not apply in this case for RXQUAL SUB. In case of half rate traffic channel TCH/H in signalling only mode, -SUB values are set equal to the -FULL values in the SACCH message, since DTX is not allowed in this case.
NOTE 2:	If measurement on the BCCH carrier is not used, the number of TDMA frames used in the RXLEV averaging process may be lower than the number of TDMA frames in the set see subclause 8.1.3.
In case of a multislot configuration, the MS shall report the following according to the definition above:
‑	on the main SACCH: the RXLEV values from the adjecent cells, RXLEV_FULL and RXLEV_SUB from the main channel and the worst RXQUAL_FULL values and RXQUAL_SUB values from the main channel and the unidirectional channels;
‑	on each other bi‑directional SACCH: the RXLEV values from the adjecent cells, RXLEV_FULL, RXLEV_SUB, RXQUAL_FULL and RXQUAL_SUB from the corresponding channel.
8.4.1.1	Measurement reporting for the MS on an E-TCH in FPC mode
For an E-TCH, the FPC reporting period of length 4 TDMA frames (20 ms) is defined according to chapter 4.7, 
When on an E-TCH, the MS shall, in addition to what is specified in chapter 8.4.1, assess during the FPC reporting period and transmit to the BSS in the next scheduled FPC inband message (see chapter 4.7) the following:
-	RXQUAL_FAST:	
RXQUAL for the set of 4 TDMA frames.
8.4.2	Measurement reporting for the MS on a SDCCH
For a SDCCH, the reporting period of length 102 TDMA frames (470.8 ms) is defined in terms of TDMA frame numbers (FN) as follows:
	TDMA frame number	
	(FN) modulo 102	
SDCCH/8	12 to 11	
SDCCH/4	37 to 36	

NOTE 1:	Some SDCCH data or TCH speech, data or SID message blocks are spread over two reporting periods. In these cases, the RXLEV and/or RXQUAL information from the SDCCH or TCH message blocks may either be sent as part of the measurement report of the second period, or shared between the reports of the two periods.
When on a SDCCH, the MS shall assess during the reporting period and transmit to the BSS in the next SACCH message block the following:
‑	RXLEV for the BCCH carrier of the 6 cells with the highest RXLEV among those with known and allowed NCC part of BSIC. For a multi band MS the number of cells, for each frequency band supported, which shall be included is specified in subclause 8.4.3. For a cell of other radio access technology, RXLEV is replaced by the relevant mapped quality measure for that radio access technology.
NOTE 2:	With only 102 TDMA frames in each SACCH multiframe, the number of samples used to calculate RXLEV per BCCH carrier may be slightly different from the case of TCH described above.
‑	RXLEV and RXQUAL for the full set of 12 (8 SDCCH and 4 SACCH) frames within the reporting period. As DTX is not allowed on the SDCCH, ‑SUB values are set equal to the ‑FULL values in the SACCH message.
NOTE 3:	If measurement on the BCCH carrier is not used, the number of TDMA frames used in the RXLEV averaging process may be lower than the number of TDMA frames in the full set see subclause 8.1.3.
8.4.3	Additional cell reporting requirements for multi band MS
For a multi band MS the number of cells, for each frequency band supported, which shall be included in the measurement report is indicated by the parameter, MULTIBAND_REPORTING, broadcast on BCCH and PBCCH. An MS attached to GPRS shall use PBCCH if it exists. In all other cases, the MS shall use BCCH. 
The meaning of different values of the parameter is specified as follows:
Value	Meaning
00	Normal reporting of the six strongest cells, with known and allowed NCC part of BSIC, irrespective of the band used.
01	The MS shall report the strongest cell, with known and allowed NCC part of BSIC, in each of the frequency bands in the BA list, excluding the frequency band of the serving cell. The remaining positions in the measurement report shall be used for reporting of cells in the band of the serving cell. If there are still remaining positions, these shall be used to report the next strongest identified cells in the other bands irrespective of the band used.
10	The MS shall report the two strongest cells, with known and allowed NCC part of BSIC, in each of the frequency bands in the BA list, excluding the frequency band of the serving cell. The remaining positions in the measurement report shall be used for reporting of cells in the band of the serving cell. If there are still remaining positions, these shall be used to report the next strongest identified cells in the other bands irrespective of the band used.
11	The MS shall report the three strongest cells, with known and allowed NCC part of BSIC, in each of the frequency bands in the BA list, excluding the frequency band of the serving cell. The remaining positions in the measurement report shall be used for reporting of cells in the band of the serving cell. If there are still remaining positions, these shall be used to report the next strongest identified cells in the other bands irrespective of the band used.
8.4.4	Common aspects for the MS on a TCH or a SDCCH
Whether the MS is on a TCH or a SDCCH, if the next SACCH message block is used for a different Layer 3 message, the averaged data which would otherwise be sent in that block is discarded and a new average started for the current block. I.e., any SACCH message will report the average data for the previous reporting period only.
The MS shall also transmit a bit (DTX_USED) in the next SACCH message block, which indicates whether or not it has employed DTX during the reporting period. This bit shall be set even if just one burst in a TDMA frame in the reporting period was not transmitted due to DTX.
NOTE:	A speech or user data frame subject to DTX may cross the "border" between two reporting periods, in which case both of the associated SACCH message blocks will have the DTX_USED flag set.
The measurements in the MS shall be based on the current BA list and the current NCC_PERMITTED (see table 1), available at the beginning of the reporting period. At the transition from idle mode to a TCH or a SDCCH the current BA list is the BA(BCCH), later the latest received complete BA(SACCH). A complete BA(SACCH) for a MS shall be that contained in SI 5 and additionally SI 5bis if the EXT-IND bit in the Neighbour Cell Description information element in both the SI 5 and SI 5bis messages indicates that each information element only carries part of the BA. If a SI 5ter message is subsequently received and not ignored ( see GSM 04.08 ) the BA(SACCH) shall be modified accordingly. 
At the transition from idle mode to a TCH or a SDCCH the current NCC is the NCC_PERMITTED received on the BCCH, later the latest NCC_PERMITTED received on the SACCH. The measurement process on carriers contained in both lists is, therefore, continuous.
If the current BA list does not refer to the serving cell, e.g. after a handover, this shall be indicated and no measurement values for cells in the BA list shall be reported.
If the MS returns to the previous cell after a failure of the handover procedure the description above applies. As a consequence, a BA list (and/or NCC_PERMITTED) received on the SAACCH in the cell to which the handover failed shall be regarded as the current ones, which may lead to interruptions in the measurement reporting as the BA list does not refer to the serving cell. As an option, the MS may in this case remember the last received BA list and NCC_PERMITTED in the old cell and regard those as the current ones when returning.
8.4.5	Measurement reporting for the BSS
Unless otherwise specified by the operator, the BSS shall make the same RXLEV (full and sub) and RXQUAL (full and sub) assessments as described for the MS for all TCH's and SDCCH's assigned to an MS, using the associated reporting periods. These values, together with the reported values from the MS, shall be transmitted to the BSC as described in the GSM 08.58.
8.4.6	Extended measurement reporting
When on a TCH or SDCCH, the mobile station may receive an Extended Measurement Order (EMO) message. The mobile station shall then, during one reporting period, perform received signal level measurements according to the frequency list contained in the EMO message. BSIC decoding is not required for these frequencies. The mobile station shall in the next SACCH message block transmit the Extended Measurement Report message, containing the following:
-	RXLEV (as defined in subclause 8.1.4) for the carriers specified by the last received EMO message. If the EMO contains more than 21 carriers, only the 21 first carriers in the sorted EXTENDED MEASUREMENT FREQUENCY LIST (in the EMO) are measured and reported.
-	DTX USED, as defined in subclause 8.4.4.
NOTE:	the position of the signal strength measurement samples performed by the mobile station, and the duration of these samples are not known in a TDMA frame. Consequently, in case the signal level on the carrier the MS has to monitor is not constant, the MS will report as the RXLEV value, the signal strength measurements performed  during its sampling period. This value can be different from the mean value of the signal level on the whole frame.
If extended measurements are not possible due to the requirements on reporting of normal measurements (see GSM 04.08), the extended measurements shall be suppressed and scheduled at the next possible opportunity. If reporting is not possible due to requirements to send other Layer 3 messages, the measurements shall be discarded and new measurements scheduled at the next possible opportunity. If extended measurements can not be reported within 10 seconds after the triggering EMO was received, they shall be discarded (and not reported).
If the EMO message contains frequencies outside the MS’ frequency band, the MS shall set the corresponding RXLEV value(s) to zero.
After a successful channel change, no Extended Measurement Report shall be sent if the EMO was received before that channel change.
After having performed Extended Measurements during one reporting period, the mobile station shall resume the measurements according to the current BA list. This applies for each rescheduling of the Extended measurements.
8.4.7	Additional cell reporting requirements for multi mode MS
A multimode MS shall report the number of best identified cells, in each supported other radio access technology in the neighbour cell list, according to the value of the parameter MULTIRAT_REPORTING. The remaining positions in the measurement report shall be used for reporting of GSM cells as defined in subcluase 8.4.3. If there are still remaining positions, these shall be used to report the next best identified cells in other radio access technologies.
For UTRAN FDD, the cells are identified by its scrambling code provided in the neighbour cell list. 
MULTIRAT_REPORTING is broadcast on BCCH and PBCCH. An MS attached to GPRS shall use PBCCH if it exists. In all other cases, the MS shall use BCCH. 
8.4.8	Enhanced Measurement Reporting
The network may request the MS to report serving cell and neighbour cell measurements with Measurement Report2 message by sending the MEASUREMENT INFORMATION message (See GSM 04.18). This reporting is referred as Enhanced Measurement Reporting.
If Enhanced Measurement Reporting is used, the BCCH carriers and corresponding valid BSICs of the neighbour cells are sent  to the MS within System Information messages and MEASUREMENT INFORMATION message (See GSM 04.18). 
As an exception to subclause 7.2 the NCC_PERMITTED shall not be concidered for the BSICs listed in the MEASUREMENT INFORMATION message.
8.4.8.1	Reporting Priority
The MS shall include the neighbour cell measurement results to the Measurement Report 2 message using following priority order:
1.	The number of strongest cells with known and valid BSIC, in the frequency band of the serving cell according to the indicated value of SERVING_BAND_REPORTING parameter as defined below. 
2.	The number of strongest cells with known and valid BSIC, in each of the frequency bands in the BA list, excluding the frequency band of the serving cell according to the indicated value of MULTIBAND_REPORTING parameter as defined below. and 
the number of best identified cells, in each supported other radio access technology in the neighbour cell list, according to the value of the parameter MULTIRAT_REPORTING. For UTRAN FDD, the cells are identified by its scrambling code provided in the neighbour cell list.
3.	The remaining cells indicated with the PRIORITY parameter in MEASUREMENT INFORMATION message.
4.	The remaining cells with valid BSIC or with known and allowed NCC part of the BSIC and the remaining identified cells of other radio access technologies. These cells may be reported less frequently, if permitted by the network, but at least once in four consecutive measurement reports. . 
GSM cells without valid BSIC but with known and allowed NCC part of the BSIC shall be reported in MEASUREMENT REPORT2 message only if it is permitted by the network. 

For each of the priority levels above, the following shall apply: 
-	If the number of identified cells is less than indicated the unused positions in the report shall be left for the lower prioritised cells. 
-	If there is not enough space in the report for all identified cells, the best cells shall be reported according to the relevant mapped quality measure for respective radio access technology.  
The meaning of different values of the SERVING_BAND_REPORTING MULTIBAND_REPORTING and MULTIRAT_REPORTING parameters, which are transmitted in MEASUREMENT INFORMATION message (see GSM 04.18), are specified as follows:
Value	Meaning
0		No priority reporting.
1		The strongest cell.
2		Two strongest cells.
3		Three strongest cells.

8.4.8.2	Measurement Reporting
The reporting period shall be as specified in 8.4.1 for the MS on a TCH and as specified in 8.4.2 for the MS on a SDCCH.
When on a TCH, the MS shall assess during the reporting period and transmit to the BSS in the next SACCH message block the following:
    RXLEV for neighbour cells as defined in 8.4.8.1. For a cell of other radio access technology, RXLEV is replaced by the relevant mapped quality measure for that radio access technology.
‑	RXQUAL_FULL:	
RXQUAL for the full set of TCH and SACCH TDMA frames. The full set of TDMA frames is either 100 (i.e. 104 ‑ 4 idle) frames for a full rate TCH or 52 frames for a half‑rate TCH.
     RXLEV_VAL: 
RXLEV measured on SACCH frames and on the time slots belonging to data blocks  the MS has correctly decoded, during the last measurement period whether the DTX was used in downlink or not. For speech traffic channels, frames that have not been erased, shall be considered as correctly received. For non-transparent data frames are concidered as correctly received according the CRC received. For transparent data RXLEV is measured on all frames.
-	MEAN_BEP and CV_BEP:
The average over the reporting period of the Mean and Coefficient of Variation of the Bit Error Probability measures ( see subclause 8.2.3).
-	NBR_RCVD_BLOCKS:
The number of valid blocks received during the measurement report period. 

In case of a multislot configuration the MS shall report the following according to the definition above:
‑	on the main SACCH: the RXLEV values from the adjacent cells, RXLEV_VAL from the main channel and the worst RXQUAL_FULL values and MEAN_BEP and CV_BEP values from the main channel and the unidirectional channels;
-	on each other bi‑directional SACCH: the RXLEV values from the adjecent cells, RXLEV_VAL, RXQUAL_FULL, MEAN_BEP and CV_BEP from the corresponding channel.

When on a SDCCH, the MS shall assess during the reporting period and transmit to the BSS in the next SACCH message block the following:
-     RXLEV for neighbour cells as defined in 8.4.8.1. For a cell of other radio access technology, RXLEV is replaced by the relevant mapped quality measure for that radio access technology.
-	RXLEV_VAL, RXQUAL_FULL,  MEAN_BEP and CV_BEP for the full set of 12 (8 SDCCH and 4 SACCH) frames within the reporting period. As DTX is not allowed on the SDCCH, measurements on all frames shall be included for RXLEV_VAL.
The common aspects for the MS on a TCH or a SDCCH as defined in 8.4.4 shall apply except the MS shall average the measurements of the current and the previous reporting period (i.e. over two reporting periods) for those cells that have not been reported in the previous SACCH message.
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10.1	Cell Re-selection
In GPRS Standby and Ready states, cell re-selection is performed by the MS, except for a class A MS (see GSM 02.06) while in dedicated mode of a circuit switched connection, in which case the cell is determined by the network according to the handover procedures (see subclause 3). When the circuit switched connection is released, the MS shall resume cell re-selection (see subclause 6.7.1). 
The cell re-selection procedures defined in subclauses 10.1.1. to 10.1.3. apply to the MSs attached to GPRS if a PBCCH exists in the serving cell.
If PBCCH does not exist, the criteria and algorithms defined in subclauses 10.1.2 and 10.1.3 shall also apply to cells for which the GPRS cell re-selection parameters are provided to the MS in a Packet Cell Change Order or Packet Measurement Order message (see 04.60). In this case, the MS may convert the idle mode cell re-selection parameters, received for the other cells according to clause 6, to GPRS cell re-selection parameters according to table 4 and use the same procedures, except that the MS may measure received signal strength in packet idle mode according to either subclause 6.6.1 or subclause 10.1.1. 
Otherwise the MS shall perform cell re-selection according to the idle mode procedures defined in clause 6, except that the MS is only required to monitor full system information on BCCH of the serving cell if indicated by change mark on BCCH or PACCH. If PBCCH exists, the MS is not required to monitor system information on BCCH of the serving cell or any system information of the non-serving cells and only required to monitor system information on PBCCH of the serving cell if indicated by change mark on PBCCH, PCCCH or PACCH. 
For both cases (with or without PBCCH), the details of system information monitoring are specified in GSM 04.60.
In packet transfer mode, the MS shall always measure received signal strength according to subclause 10.1.1.
In addition, the network may control the cell selection as defined in subclause 10.1.4.
The cells to be monitored for cell re-selection are defined in the BA(GPRS) list, which is broadcast on PBCCH. If PBCCH does not exist, BA(GPRS) is equal to BA(BCCH).
For a multi mode MS, cell re-selection to other radio access technologies shall also be possible. 
10.1.1	Monitoring the received signal level and PBCCH data
The MS shall measure the received RF signal level on the BCCH carriers of the serving cell and the surrounding cells as indicated in the BA(GPRS) list and optionally the NC_FREQUENCY_LIST, and calculate the received level average (RLA_P) for each carrier. 
In addition the MS shall verify the BSIC of the BCCH carriers. Only cells with allowed BSIC shall be considered for re-selection. The allowed BSIC is either the BSIC broadcast for that carrier in the BA(GPRS) list or, for cells in BA(BCCH) where no BSIC is broadcast, a BSIC with allowed NCC part (see subclause 7.2).
In addition to what is described in subclause 10.1.1.1 and 10.1.1.2, an MS supporting SoLSA with SoLSA subscription shall attempt to decode BSIC for the 6 strongest carriers, with LSA IDs to which the MS subscribes. At least one carrier shall be searched every 5 minutes, one after another. In the case the MS has been able to decode the BSIC, the rules described in 10.1.3 shall be followed. The LSA IDs of the carriers are broadcast on PBCCH of the serving cell.
For a multi mode MS, cells with other radio access technologies may also be included in the neighbour cell list to be monitored. For this monitoring, the MS may use search frames that are not required for BSIC decoding. For UTRAN FDD, the list will contain scrambling codes instead of BSIC. Only cells with valid scrambling code shall be considered for re-selection. For details and requirements, refer to 3GPP TS 25.304. 
10.1.1.1	Packet idle mode
Whilst in packet idle mode (see 03.64) an MS shall continuously monitor all BCCH carriers as indicated by the BA(GPRS) list and the BCCH carrier of the serving cell. At least one received signal level measurement sample on each BCCH carrier shall be taken for each paging block monitored by the MS according to its current DRX mode and its paging group. As the minimum MS shall take one measurement for each BCCH carrier for every 4 second. As the maximum, the MS is however not required to take more than 1 sample per second for each BCCH carrier. 
RLA_P shall be a running average determined using samples collected over a period of 5 s to Max {5s, five consecutive paging blocks of that MS}, and shall be maintained for each BCCH carrier. The same number of measurement samples shall be taken for all BCCH carriers, and the samples allocated to each carrier shall as far as possible be uniformly distributed over the evaluation period. At least 5 received signal level measurement samples are required for a valid RLA_P value.
The list of the 6 strongest non‑serving carriers shall be updated at a rate of at least once per running average period.
The MS shall attempt to check the BSIC for each of the 6 strongest non‑serving cell BCCH carriers at least every 14 consecutive paging blocks of that MS or 10 seconds, whichever is greater. If a change of BSIC is detected then the carrier shall be treated as a new carrier.
In the case of a multiband MS, the MS shall attempt to decode the BSIC, if any BCCH carrier with unknown BSIC is detected among the number of strongest BCCH carriers in each band as indicated by the parameter MULTIBAND_REPORTING (see subclause 8.4.3), broadcast on PBCCH, or if PBCCH does not exist, on BCCH.
When requested by the user, the MS shall determine which PLMNs are available as described in subclause 6.6.1. However, for MSs without DRX or with short DRX period (see GSM 05.02), considerable interruptions to the monitoring of PPCH or PCH can not be avoided.
10.1.1.2	Packet transfer mode
Whilst in packet transfer mode an MS shall continuously monitor all BCCH carriers as indicated by the BA(GPRS) list and the BCCH carrier of the serving cell. In every TDMA frame, a received signal level measurement sample shall be taken on at least one of the BCCH carriers, one after the another. Optionally, measurements during up to 2 TDMA frames per PDCH multiframe may be omitted if required for BSIC decoding.
RLA_P shall be a running average determined using samples collected over a period of 5 s, and shall be maintained for each BCCH carrier. The same number of measurement samples shall be taken for all BCCH carriers except, if the parameter PC_MEAS_CHAN indicates that the power control measurements shall be made on BCCH (see subclause 10.2.3.1.2), for the serving cell where at least 6 measurement samples shall be taken per 52-multiframe. The samples allocated to each carrier shall as far as possible be uniformly distributed over the evaluation period. At least 5 received signal level measurement samples are required for a valid RLA_P value.
If an MS with a multislot class number 19-29 (see GSM 05.02), performing a multislot downlink packet transfer with dynamic or extended dynamic allocation (see GSM 04.60), is not able to perform received signal level measurements within the TDMA frame according to its multislot class, the MS shall perform the measurements during the block period where the uplink acknowledge is sent. During this block period, the MS shall use the time slots after the PDCH carrying PACCH for measurements according to its measurement capability (see GSM 05.02). 
NOTE 1:	The network is responsible for providing the necessary acknowledgement block periods to ensure that the MS will perform the required number of measurements.
If an MS with a multislot class number 19-29 (see GSM 05.02), performing a multislot uplink or downlink transfer with fixed allocation (see GSM 04.60), is not able to perform received signal level measurements within the TDMA frame according to its multislot class, the MS shall perform the measurements during inactivity periods, defined in the assignment command (see GSM 04.60), according to its measurement capability (see GSM 05.02).
NOTE 2:	The network is responsible for providing the necessary inactivity periods to ensure that the MS will perform the required number of measurements.
The MS shall attempt to check the BSIC for as many non‑serving cell BCCH carriers as possible and as often as possible, and at least every 10 seconds. The MS shall use the two Idle frames of the PDCH multiframe for this purpose. These frames are termed “search” frames. A list containing BSIC and timing information for these strongest carriers at the accuracy required for accessing a cell (see GSM 05.10) including the absolute times derived from the parameters T1, T2, T3 shall be kept by the MS. This information may be used to schedule the decoding of BSIC and shall be used when re-selecting a new cell in order to keep the switching time at a minimum. When a BCCH carrier is found to be no longer among the reported, BSIC and timing information shall be retained for 10 seconds. (This is in case a cell re-selection command to this cell is received just after the MS has stopped reporting that cell, see subclause 10.1.4.2).
If an MS, performing a multislot uplink transfer with fixed allocation, is not able to perform BSIC decoding within the search frames according to its multislot class, the MS shall perform the BSIC decoding between allocations. The MS shall determine the necessary periods by not requiring uplink resources.
If an MS, performing a multislot downlink transfer with fixed allocation, is not able to perform BSIC decoding within the search frames according to its multislot class, the MS shall perform the BSIC decoding during inactivity periods. The MS shall request these inactivity periods from the network to allow for the required BSIC decoding (see GSM 04.60).
If, after averaging measurement results over 4 PDCH multiframes (1 sec), the MS detects one or more BCCH carriers, among the 6 strongest, whose BSICs are not currently being assessed, then the MS shall as a matter of priority attempt to decode their BSICs.
The MS shall be able to send the first packet random access (PRACH) at the latest 5+x seconds after a new strongest cell (which is part of the BA(GPRS)) has been activated under the following network conditions: Initial serving cell at RXLEV= -70 dBm, with 6 neighbours at RXLEV= -75 dBm. Then the new BCCH carrier is switched on at RXLEV= -60 dBm. x is the longest time it may take to receive the necessary system information on PBCCH in the new cell.
Note: Because of test equipment limitations it is acceptable to activate the new carrier to replace one of the 6 neighbours.
In the case of a multiband MS, the MS shall attempt to decode the BSIC, if any BCCH carrier with unknown BSIC is detected among the number of strongest BCCH carriers in each band as indicated by the parameter MULTIBAND_REPORTING (see subclause 8.4.3), broadcast on PBCCH, or if PBCCH does not exist, on BCCH.
Thus an MS shall, for a period of up to 5 seconds, devote all search frames to attempting to decode these BSICs. If this fails then the MS shall return to confirming existing BSICs. Having re‑confirmed existing BSICs, if there are still BCCH carriers, among the six strongest, with unknown BSICs, then the decoding of these shall again be given priority for a further period of up to 5 seconds.
If either no BSIC can be decoded on a surrounding cell BCCH carrier, or the BSIC is not allowed, then the received signal level measurements on that channel shall be discarded and the MS shall continue to monitor that channel. 
If a change of BSIC is detected on a carrier, then any existing received signal level measurement shall be discarded and the carrier shall be treated as a new carrier.
If the BSIC cannot be decoded at the next available opportunities re‑attempts shall be made to decode this BSIC. If the BSIC is not decoded for more than three successive attempts it will be considered lost and any existing received signal level measurement shall be discarded and the MS shall continue to monitor that carrier.
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10.1.4	Network controlled Cell re-selection
The network may request measurement reports from the MS and control its cell re‑selection. This is indicated by the parameter NETWORK_CONTROL_ORDER. The meaning of the different parameter values is specified as follows:
NC0	Normal MS control 	
The MS shall perform autonomous cell re-selection.
NC1	MS control with measurement reports 	
The MS shall send measurement reports to the network as defined in subclause 10.1.4.1.
The MS shall perform autonomous cell re-selection.	
NC2	Network control 	
The MS shall send measurement reports to the network as defined in subclause 10.1.4.1.
The MS shall not perform autonomous cell re-selection. 
RESET	The MS shall return to the broadcast parameters. Only sent on PCCCH or PACCH.
The parameter values NC1 and NC2 only apply in Ready state. In Standby state, the MS shall always use normal MS control independent of the ordered NC mode. 
A set of measurement reporting parameters (NETWORK_CONTROL_ORDER and NC_REPORTING_PERIOD(s)) is broadcast on PBCCH. The parameters may also be sent individually to an MS on PCCCH or PACCH, in which case it overrides the broadcast parameters. The individual parameters are valid until the RESET command is sent to the MS or there is a downlink signalling failure or the MS goes to the Standby state. Before the MS has acquired NC parameters when entering a new cell, it shall assume mode NC0 unless individual parameters were given by Packet Cell Change Order or Packet Measurement Order in the previous cell.
A parameter NC_FREQUENCY_LIST may also be sent individually to an MS on PCCCH or PACCH. This list adds/deletes frequencies to the BA(GPRS) both for cell re-selection and for measurement reports. For added frequencies, the corresponding cell re-selection parameters may be included. If no cell re-selection parameters are given for a particular cell, that cell shall only be used in mode NC2. The list is valid until an empty list is sent to the MS, there is a downlink signalling failure or the MS selects a new cell. A list given by Packet Cell Change Order applies in the new cell.
The lists above may also include cells with other radio access technologies.
All signalling for support of network controlled cell re-selection and measurement reports are defined in GSM 04.60.
10.1.4.1	Measurement reporting
When ordered to send measurement reports, the MS shall continuously monitor all carriers in BA(GPRS) or as indicated by the parameter NC_FREQUENCY_LIST and the BCCH carrier of the serving cell. Received signal level measurement samples shall be taken as often as defined in subclause 10.1.1. for the actual packet mode.
For each carrier, the measured received signal level (RXLEV) shall be the average of the received signal level measurement samples in dBm taken on that carrier within the reporting period. The reporting period is defined as follows :
-	in packet idle mode, the reporting period is NC_REPORTING_PERIOD_I rounded off to the nearest smaller integer multiple of DRX period if NC_REPORTING PERIOD_I is greater than DRX period, else, the reporting period is DRX period.
-	in packet transfer mode, the reporting period is indicated in NC_REPORTING_PERIOD_T.
In averaging, measurements made during previous reporting periods shall always be discarded. The start of the first reporting period may be random.
After each reporting period, the MS shall send a measurement report to BSS (see GSM 04.60). The MS shall then discard any previous measurement report, which it has not been able to send. The measurement report shall contain: 
-	RXLEV for the serving cell.
-	in packet idle mode, the average interference level ch (see subclause 10.2.3.2.2) for the serving cell measured on the monitored PCCCH if a valid value is available. The mapping of ch to the reported I_LEVEL value is defined in subclause 10.3.
-	received signal level for the non-serving cells. Carriers shall be reported if they are among the 6 strongest carriers and BSIC is successfully decoded and allowed (see subclause 10.1.1), i.e. either equal to the BSIC of the list or with allowed NCC part of BSIC. In the latter case, which applies for BA(BCCH) where no BSIC is given, the decoded BSIC shall be included in the report. In the case of a multiband MS, the MS shall report the number of strongest BCCH carriers in each band as indicated by the parameter MULTIBAND_REPORTING (see subclause 8.4.3), broadcast on PBCCH, or if PBCCH does not exist, on BCCH. For multi mode MS, the MS shall report the number of best identified cells in each other radio access technology as indicated by the parameter MULTIRAT_REPORTING (see subclause 8.4.7), broadcast on PBCCH, or if PBCCH does not exist, on BCCH. In this case, the received signal level is replaced by the relevant mapped quality measure (see 3GPP TS 25.304). For UTRAN FDD, the cells are identified by its scrambling code provided in the neighbour cell list.
-	while Enhanced Measurement Reporting: received signal level for the non-serving cells of at least 6 strongest carriers, which BSIC is successfully decoded and  valid (see subclause 7.2). If permitted by the network, the RXLEV, ARFCN-index and BSIC with known and allowed NCC part, not broadcast for that carrier in the BA(GPRS), for cells with the highest RXLEV.
In Enhanced Measurement Reporting the neighbour cell reporting priority is based on the definitions in subclause 8.4.8.1., in which the Measurement Information message is  replaced with Packet Measurement order and PSI5 messages and Measurement Report2 message with Packet Measurement Report2 message.  MS shall use the Packet Measurement Report 2 message (see GSM 04.60) for reporting. The parameter SERVING_BAND_REPORTING is transmitted in Packet Measurement Order and Packet System Information 5 messages (see GSM 04.60).  The MS shall average the measurements of the current and the previous reporting period (i.e. over two reporting periods) for those cells that have not been reported in the previous reporting period.
In the case of Packet Transfer mode with the NC_REPORTING_PERIOD_T = 0.48 s the MS shall report a new strongest GSM cell in the measurement report at the latest 5 s after a new strongest cell (which is part of the BA(GPRS)) has been activated under the following network conditions: Initial serving cell at RXLEV= -70 dBm, with 6 neighbours at RXLEV= -75 dBm. Then the new PBCCH carrier is switched on at RXLEV= -60 dBm.
Note: Because of test equipment limitations it is acceptable to activate the new carrier to replace one of the 6 neighbours.
A multi mode MS may use the search frames, which are not required for BSIC decoding, to identify and measure cells belonging to other radio access technologies. For details and requirements, refer to 3GPP TS 25.304. The MS shall report a new best UTRAN FDD cell (which is part of the neighbour cell list) at the latest 5 seconds after it has been activated under the condition that there is only one UTRAN frequency in the neighbour cell list and that no new GSM cells are activated at the same time. The allowed reporting time is increased by 5 seconds for each alternative RAT frequency in the neighbour list and by the time required for BSIC decoding of new activated GSM cells. However, multiple UTRAN cells on the same frequency in the neighbour cell list does not increase the allowed reporting time.
10.1.4.2	Cell re-selection command
A cell re-selection command may be sent from the network to an MS. When the MS receives the command, it shall re-select the cell according to the included cell description and change the network control mode according to the command (see GSM 04. 60). The command may include re-selection of another radio access technology. 
10.1.4.3	Exceptional cases
An MS in network control mode NC1 or NC2 may enter any of the following exceptional cases:
-	a circuit switched connection is established, which takes precedence over GPRS cell re-selection;
-	an anonymous access is performed. 
In such a case the MS is not required to send measurement reports according to subclause 10.1.4.1, and shall not obey any cell re-selection command.
In the anonymous access case the MS shall continue to make measurements and, in mode NC1, perform autonomous cell re-selection, using the current frequency list (NC_FREQUENCY_LIST or BA(GPRS)). In mode NC2, the MS shall stay in the current cell until the anonymous access ends. Whenever the exceptional case ends and provided that the MS is still in Ready state, the MS shall resume the latest received network control mode and obey cell re-selection commands. In the anonymous access case, the MS shall continue the ongoing measurements. In the circuit switched case, the MS shall restart a new measurement period.