7 Network pre-requisites
3GPP45.008GSM/EDGE Radio subsystem link controlTS
7.1 BCCH carriers
The BCCH carrier shall be continuously transmitted on all timeslots.
In normal operation, it shall be transmitted without variation of RF level in case all timeslots on BCCH carrier are GMSK modulated and else in case of different modulated timeslots with minimum variation of RF level as specified below. An exception applies in case the BTS enters the BCCH carrier power reduction operation, for the purpose of energy saving, where the variation of RF level for all timeslots on BCCH carrier, except timeslots carrying BCCH/CCCH, is relaxed as specified below.
The RF power level may be ramped down between timeslots for instance to facilitate switching between RF transmitters.
A BTS that is switching transmission between two or more antennas, shall use the same antenna for transmission on a CCCH slot and the slot immediately preceding the CCCH slot (i.e. antenna switching shall be avoided immediately before a CCCH slot in order to avoid unpredictable path loss changes at this point).
In normal operation, for timeslots on the BCCH carrier which are transmitted with modulations other than GMSK, the output power (as defined in 3GPP TS 45.005) may be lower than the output power used for GMSK modulated timeslots. In this case, the maximum allowed difference in output power actually transmitted by the BTS is listed for each respective modulation of EGPRS, EGPRS2 and VAMOS in the table below.
In BCCH carrier power reduction operation, for timeslots on the BCCH carrier, except timeslots carrying BCCH/CCCH, the output power (as defined in 3GPP TS 45.005) may be lower than the output power used for timeslots carrying BCCH/CCCH. In this case the maximum allowed difference in output power actually transmitted by the BTS is 6 dB.
Furthermore, in normal operation, between a timeslot used for BCCH/CCCH and the timeslot preceding it, the difference in output power actually transmitted by the BTS shall not exceed 3 dB.
NOTE: The allowed output power decrease does not refer to a difference between nominal power levels, but to the difference in output power actually transmitted.
Maximum output power decrease on BCCH carrier in normal operation.
Modulation |
Output Power Decrease |
|
EGPRS |
8PSK |
4 dB |
EGPRS2-A |
16QAM |
6 dB |
EGPRS2-A |
32QAM |
6 dB |
EGPRS2-B |
QPSK |
4 dB |
EGPRS2-B |
16QAM |
6 dB |
EGPRS2-B |
32QAM |
6 dB |
VAMOS |
AQPSK |
4 dB |
The MS requirements on signal strength measurements are defined for normal operation of the BTS for the case when only GMSK modulation is used on the BCCH carrier. There are no defined signal strength measurement requirements for the MS in BCCH carrier power reduction operation or if other modulations are used on the BCCH carrier.
On the PCH the network shall send valid layer 3 messages according to 3GPP TS 44.018. Unused signalling blocks on the CCCH/BCCH shall contain L2 fill frames. Other unused timeslots shall transmit dummy bursts.
The number of neighbour cell BCCH carriers in the BCCH allocation shall not exceed 32.
NOTE 1: This BCCH organization enables MS to measure the received signal level from surrounding cells by tuning and listening to their BCCH carriers. Providing that an MS tunes to the list of BCCH carriers indicated by the network it will, providing the list is sufficiently complete, have listened to all possible surrounding cells, i.e. the surrounding cell list for handover purposes is effectively defined by the MS. Refer to 3GPP TS 43.022 for definitions of the BCCH carrier lists. This can be achieved without inter‑base station synchronization.
NOTE 2: If the operator decides to allow for the usage of modulation types other than GMSK on the BCCH carrier in certain cells, the cell selection, cell reselection and handover procedures involving these cells will be somewhat sub-optimal. This is due to the fact that the signal level measured by the MS at some instances in time will be affected by the possibly lower output power level of the 8-PSK modulation type used in EGPRS, and by the output power level of QPSK, 8-PSK, 16-QAM and 32-QAM modulation types used in EGPRS2, and by the AQPSK modulation used in VAMOS respectively, and by the power fluctuation resulting from these modulation types other than GMSK. The extent of the performance degradation is dependent upon the measurement schedule in each particular MS as well as upon the used output power decrease and the current load of the modulation types other than GMSK on the BCCH carrier. By limiting the maximum number of time slots, carrying modulation types other than GMSK, being simultaneously allowed on the BCCH carrier, and/or carefully selecting the values of involved network parameters, the impact on the above mentioned procedures may be minimised. Additionally, in areas with very low cell overlap, some coverage loss effects may have to be taken into account by the operator when selecting network parameters.
NOTE 3: In the case that QPSK, AQPSK, 8-PSK, 16-QAM or 32-QAM modulation s (see Note 2) are allowed on the BCCH carrier and frequency hopping including the BCCH carrier is used, the reception quality in connected mode for some fast moving MS (meaning MS experiencing Doppler frequencies of 100 Hz or more) may be degraded. This may be seen as a backwards compatibility problem for some existing MS, most likely occurring if the used APD is larger than 2 dB.
NOTE 4: In case the BTS supports BCCH carrier power reduction operation, in order to yield network energy savings, the usage of this operation mode by the operator needs some consideration. For instance in areas with very low cell overlap, some coverage loss effects may have to be taken into account. Additionally the operated reduction of output power on timeslots of the BCCH carrier should be similar in neighbouring cells, i.e. the usage of this operation mode should not be applied cell specific, but applied to as many cells as possible in a certain geographic area. The benefit of this operation mode in busy hour times was investigated to be rather limited [48]. Thus the actual level of operated power reduction on timeslots of the BCCH carrier except timeslots carrying BCCH/CCCH should generally be reduced along the increase of traffic load in cells and may be selected to be higher for idle timeslots than for occupied timeslots. Usage of power reduction on timeslots of the BCCH carrier carrying SDCCH in BCCH carrier power reduction operation is not recommended.
7.2 Identification of surrounding BSS
7.2.1 General
It is essential for the MS to identify which surrounding BSS is being measured in order to ensure reliable handover and/or for cell reselection purposes. 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 6 bit base station identification code (BSIC).
In networks where EC-GSM-IoT is supported, the frequency re-use cluster size is expected to be smaller than for networks not supporting EC-GSM-IoT. To allow unique identification of surrounding cells, the BSIC used for EC-GSM-IoT on the EC-SCH is 9 bits. The 9 bit Base Station Identity Code (BSIC) shall be transmitted on each BCCH carrier where the EC-SCH is also mapped. The BSIC is sent as part of the EC-SCH payload space (see 3GPP TS 44.018) and consists of 3 bits of Network colour code (NCC), 3 bits of BS colour code (BCC) and 3 bits of Radio frequency Colour Code (RCC), as defined in 3GPP TS 23.003. An MS that has enabled EC operation shall use the 9 bit BSIC value for BSIC decoding and confirmation of EC-GSM-IoT capable cells. The 9 bit BSIC shall also be used by a MS in EC operation when sending a packet channel request, see 3GPP TS 45.003.
To allow unique identification of the serving cell in a network supporting PEO, a 9 bit Base Station Identity Code (BSIC) is used, which consists of 3 bits of Network colour code (NCC), 3 bits of BS colour code (BCC) and 3 bits of Radio frequency Colour Code (RCC), see 3GPP TS 23.003. The NCC and the BCC are sent as part of the SCH payload space and the RCC is included in the System Information Type 13 message and in AGCH and PCH messages, see 3GPP TS 44.018. An MS that has enabled PEO shall use the 9 bit BSIC value (NCC, BCC and RCC) for BSIC decoding and confirmation of a PEO capable cell. The 9 bit BSIC shall also be used by an MS that has enabled PEO when sending a packet channel request, see 3GPP TS 45.003.
The MS shall be able to demodulate BCCH carriers and identify the BSIC at levels down to the reference sensitivity level or reference interference levels as specified in 3GPP TS 45.005.
7.2.2 Identification of surrounding BSS for handover measurements
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 3GPP TS 23.003, 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 cells as possible, and decode the BSIC as often as possible, and as a minimum at least once every 10 seconds. A multi-RAT MS is allowed to extend this period to 13 seconds, if the neighbour cell list contains cells or frequencies from other RATs. The MS shall give priority for synchronisation attempts in signal strength order and considering the parameter MULTIBAND_REPORTING. A list containing information about the timing of the surrounding cells at the accuracy required for accessing a cell (see 3GPP TS 45.010) 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 3GPP TS 45.010) to assist the MS in neighbour cell synchronisation attempts. This assistance data is included in the MEASUREMENT INFORMATION message (See 3GPP TS 44.018). RTD is provided modulo one multiframe (51 TDMA frames). The resolution is either one TDMA frame, in which case the MS can assume that the cells are frame synchronised, or 1/64 TDMA frame. 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, depends on the Observed Time Difference (OTD, see 3GPP TS 45.010) 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 parameter MULTIBAND_REPORTING.
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.
If either no BSIC can be demodulated on a surrounding cell BCCH carrier, or the BSIC is not allowed, then the received signal level measurements on that channel shall be discarded. The allowed BSIC is either the BSIC broadcast for that carrier in the neighbour cell list or, if no BSIC is included or if indicated by the parameter INVALID_BSIC_REPORTING, a BSIC with permitted NCC part. 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). In a shared cell, the MS supporting Network sharing (see 3GPP TS 44.018 [17], 3GPP TS 23.251 [45] and 3GPP TS 24.008 [46]) shall use the NCC_PERMITTED applicable for the selected PLMN.
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.
If an MS receives a handover command towards a GSM cell to which it is not synchronised to, then the MS shall search for synchronisation information up to 300 ms. In case of failure, the MS shall refer to the handover failure procedure (see 3GPP TS 44.018).
If a multi-RAT MS receives a handover command towards a not known cell (see 3GPP TS 25.133 and 3GPP TS 25.123 for UTRAN), then the multi-RAT MS shall search for synchronisation information up to 800 ms. In case of failure, the multi-RAT MS shall refer to the handover failure procedure (see 3GPP TS 44.018).
Details of the synchronization mechanisms appear in 3GPP TS 45.010. 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).
7.3 Handover measurements on other radio access technologies
For a multi-RAT MS, the network controls the identification and measurements of UTRAN and CDMA2000 cells by the parameter Qsearch_C sent on SACCH or, if Qsearch_C is not received, by Qsearch_C_Initial sent on BCCH. Qsearch_C defines a threshold and also indicates whether these tasks shall be performed when RXLEV (see subclause 8.1.3) of the serving BCCH carrier is below or above the threshold.
If the serving cell is not included in the BA(SACCH) list, the dedicated channel is not on the BCCH carrier, and Qsearch_C is not equal to 15, the MS shall disregard the Qsearch_C parameter value and always search for UTRAN and CDMA2000 cells. If Qsearch_C is equal to 15, the MS shall never search for UTRAN or CDMA2000 cells.
For a UTRAN capable MS, the network enables the identification and measurement for UTRAN cells on specific frequencies by DEFAULT_Measurement_Control_UTRAN and Measurement_Control_UTRAN sent on SACCH.
For a E-UTRAN capable MS, the network controls the identification and measurements of E-UTRAN cells by the parameter Qsearch_C_E-UTRAN sent on SACCH or, if Qsearch_C_E-UTRAN is not received, by Qsearch_C_E-UTRAN_Initial sent on BCCH.
For a E-UTRAN capable MS, the network enables the identification and measurement for E-UTRAN cells on specific frequencies by DEFAULT_Measurement_Control_E-UTRAN and Measurement_Control_E-UTRAN sent on SACCH.
The MS may use the search frames, which are not required for BSIC decoding, for measurements of UTRAN, CDMA2000 and E-UTRAN cells. The MS may use up to 25 search frames per 13 seconds without considering the need for BSIC decoding in these frames.
A UTRAN capable MS shall report a new best UTRAN 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 no E-UTRAN frequencies in the E-UTRAN Neighbour Cell list) and that no new GSM cells are activated at the same time and under good radio conditions. A E-UTRAN capable MS that supports measurement reporting in dedicated mode or dual transfer mode shall report a new best E-UTRAN cell, on a frequency contained in the neighbour cell list, at the latest 5 seconds after it has been activated under the condition that there is only one E-UTRAN frequency in the neighbour cell list (and no UTRAN frequencies in the 3G Neighbour Cell list) and that no new GSM cells are activated at the same time and under good radio conditions. For test purposes the following radio conditions can be used: Serving GSM cell at RXLEV= -70 dBm, with 6 GSM neighbours at RXLEV= -75 dBm. Then either an UTRAN FDD neighbour cell or an UTRAN TDD neighbour cell or an E-UTRAN FDD neighbour cell or an E-UTRAN TDD neighbour cell is switched on. The radio conditions for the UTRAN FDD cell are as follows (see 3GPP TS 25.101 for definitions):
Parameter |
Unit |
UTRAN FDD Cell |
CPICH_Ec/Ior |
dB |
-10 |
P-CCPCH_Ec/Ior |
dB |
-12 |
SCH_Ec/Ior |
dB |
-12 |
PICH_Ec/Ior |
dB |
-15 |
DPCH_Ec/Ior |
dB |
- |
OCNS_Ec/Ior |
dB |
-0.94 |
dB |
10 |
|
dBm/3.84 MHz |
-70 |
|
CPICH_Ec/Io |
dB |
-10.4 |
CPICH RSCP |
dBm |
-70 |
FDD_MULTIRAT_ |
integer |
1 |
Qsearch_C |
integer |
7 (search always) |
Propagation Condition |
AWGN |
The radio conditions for the UTRAN TDD cell (either 3.84 Mcps TDD option or 1.28 Mcps TDD option) are as follows (see 3GPP TS 25.123 for definitions and for the values of the remaining configuration parameters):
Parameter |
Unit |
UTRAN TDD Cell (3.84 Mcps option) |
|
Timeslot Number |
0 |
8 |
|
P-CCPCH_Ec/Ior |
dB |
-3 |
|
SCH_Ec/Ior |
dB |
-9 |
-9 |
SCH_toffset |
integer |
0 |
0 |
PICH_Ec/Ior |
dB |
-3 |
|
OCNS_Ec/Ior |
dB |
-3.12 |
-3.12 |
P-CCPCH RSCP |
dBm |
-70 |
-70 |
TDD_MULTIRAT_ |
integer |
1 |
|
Qsearch_C |
integer |
7 (search always) |
|
Propagation Condition |
AWGN |
NOTE: On timeslot 8 the P-CCPCH is not transmitted; on that timeslot, the P-CCPCH RSCP defines the power level of the beacon channel.
Parameter |
Unit |
UTRAN TDD Cell (1.28 Mcps option) |
|
Timeslot Number |
0 |
DwPTS |
|
P-CCPCH_Ec/Ior |
dB |
-3 |
|
DwPCH_Ec/Ior |
dB |
0 |
|
OCNS_Ec/Ior |
dB |
-3 |
|
P-CCPCH RSCP |
dBm |
-70 |
|
TDD_MULTIRAT_ |
integer |
1 |
|
Qsearch_C |
integer |
7 (search always) |
|
Propagation Condition |
AWGN |
The radio conditions for the E-UTRAN FDD cell are as follows (see 3GPP TS 36.101 for definitions):
Parameter |
Unit |
E-UTRAN FDD Cell |
|
Channel Bandwidth |
MHz |
10 |
|
PSS_RB, SSS_RB, PBCH_RA, PBCH_RB, PCFICH_RA, PHICH_RA, PHICH_RB, PDCCH_RA, PDCCH_RB, PDSCH_RA, PDSCH_RB |
dB |
0 |
|
OCNG_RA (Note 1) |
dB |
0 |
|
OCNG_RB (Note 1) |
dB |
0 |
|
Noc |
dBm/15kHz |
-98 |
|
Ês/Iot |
dB |
12 |
|
RSRP |
dBm/15kHz |
-86 |
|
SCH_RP |
dBm |
-86 |
|
Qsearch_C_E-UTRAN |
integer |
7 (search always) |
|
E-UTRAN_MULTIRAT_ REPORTING |
integer |
1 |
|
OCNG pattern |
OP.2 FDD (see 3GPP TS 36.133) |
||
MIMO configuration |
single transmitter |
||
Propagation Condition |
AWGN |
||
NOTE 1: OCNG shall be used such that the E-UTRAN cell is fully allocated and a constant total transmitted power spectral density is achieved for all OFDM symbols. |
The radio conditions for the E-UTRAN TDD cell are as follows (see 3GPP TS 36.101 for definitions):
Parameter |
Unit |
E-UTRAN TDD Cell |
|||
Channel Bandwidth |
MHz |
10 |
|||
PSS_RB, SSS_RB, PBCH_RA, PBCH_RB, PCFICH_RA, PHICH_RA, PHICH_RB, PDCCH_RA, PDCCH_RB, PDSCH_RA, PDSCH_RB |
dB |
0 |
|||
OCNG_RA (Note 1) |
dB |
0 |
|||
OCNG_RB (Note 1) |
dB |
0 |
|||
Noc |
dBm/15kHz |
-98 |
|||
Ês/Iot |
dB |
12 |
|||
RSRP |
dBm/15kHz |
-86 |
|||
SCH_RP |
dBm |
-86 |
|||
Qsearch_C_E-UTRAN |
integer |
7 (search always) |
|||
E-UTRAN_MULTIRAT_ REPORTING |
integer |
1 |
|||
OCNG pattern |
OP.2 TDD (see 3GPP TS 36.133) |
||||
MIMO configuration |
single transmitter |
||||
Propagation Condition |
AWGN |
||||
NOTE 1: OCNG shall be used such that the E-UTRAN cell is fully allocated and a constant total transmitted power spectral density is achieved for all OFDM symbols. |
The allowed reporting time is increased by 5 seconds for each additional UTRAN frequency in the neighbour cell list or for each additional E-UTRAN frequency in the neighbour cell 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.
When on TCH, identification of a UTRAN TDD cell is guaranteed only in case of single slot operation and, for the 3.84 Mcps option, if the UTRAN TDD cell uses synchronisation option 2 (see 3GPP TS 25.221). In all other cases, the MS may not be able to fulfil the requirement above. If after 5 seconds the MS has not been able to identify a UTRAN TDD cell, the MS is allowed to stop searching for it in the current GSM cell.
When on SDCCH, the MS may use all TDMA frames, which are not part of the assigned channel or required for GSM signal strength measurements, for the above task. In this case the allowed reporting time is 1.7 seconds, with the same assumptions as above.
A multi-RAT MS shall be able to monitor cells from other radio access technologies, divided into (depending on the MS capability):
– UTRAN FDD cells on up to 3 FDD frequencies, with a maximum of 32 cells per frequency
– UTRAN TDD cells on up to 3 TDD frequencies, with a maximum of 32 cells per frequency; and/or
– CDMA2000 cells; and/or
– E-UTRAN FDD cells on up to 3 FDD frequencies; and/or
– E-UTRAN TDD cells on up to 3 TDD frequencies.
The total number of monitored UTRAN and CDMA2000 cells shall not exceed 64.
An MS supporting E-UTRAN measurements shall be capable of monitoring a minimum total of 7 other RAT carrier frequency layers, comprising of any above defined combination of E-UTRAN FDD, E-UTRAN TDD, UTRAN FDD and UTRAN TDD layers.
The MS shall be capable of performing RSCP and Ec/No measurements of at least 4 best UTRAN cells per UTRAN frequency and RSRP and RSRQ measurements of at least 4 best E-UTRAN cells per E-UTRAN frequency, according to its supported capabilities.
A multi-RAT MS with no or an empty Permitted CSG list, or which does not indicate support of "UTRA CSG Cells Reporting" in the Classmark 3 IE (see 3GPP TS 24.008), is not required to measure, and shall not report, cells known to be CSG cells while in dedicated mode or dual transfer mode.
7.4 Handover measurements on UTRAN CSG cells and hybrid cells
A UTRAN capable mobile station supporting "UTRA CSG Cells Reporting" shall support MIB/SIB3 reading and reporting for UTRAN CSG cells in dedicated mode and dual transfer mode. The mobile station may acquire the routing parameters and CSG ID of a UTRAN CSG cell by reading MIB and SIB3 of that cell (see 3GPP TS 25.331). The MS is allowed to autonomously skip idle frames or TDMA frames on TCH and/or, in case of dual transfer mode, on PDCH to read MIB and SIB3 and only skips the timeslot(s) or TDMA frame(s) during which either MIB or SIB3 is transmitted.
A UTRAN capable mobile station which indicates support of "UTRA CSG Cells Reporting" in the Classmark 3 IE (see 3GPP TS 24.008) shall report CSG cells and hybrid cells in dedicated mode and dual transfer mode according to the procedures in sub-clause 8.4.9 if:
– the cell is the strongest of any cell on the same frequency (see 3GPP TS 25.304 [8] for the definition of the strongest cell); and
– (for UTRAN FDD CSG cells) the reported value (CPICH Ec/No) is equal to or higher than UTRAN_CSG_FDD_REPORTING_THRESHOLD and the non-reported value (CPICH RSCP) is equal to or higher than UTRAN_CSG_FDD_REPORTING_THRESHOLD_2; and
– (for UTRAN TDD CSG cells) the reported value (P-CCPCH RSCP) is equal to or higher than UTRAN_CSG_TDD_REPORTING_THRESHOLD; and
– the conditions specified in 3GPP TS 44.018 are met.
The parameters Qsearch_C and Measurement_Control_UTRAN are not applicable to UTRAN CSG cells.
If information about dedicated CSG frequencies is available to the MS, the MS may restrict the measurement of CSG cells to only those on these dedicated frequencies and the other frequencies listed in the system information.