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爱立信GSM参数说明(部分)


8(163) 90/1553-HSC 103 12 Uen Rev B 2001-02-01

Cell data
BSPWRB Type: Numeral. Range: 0 to 63. Unit: dBm. Default: – Command: RLCPC.
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Comments: Base Station output power in dBm for the BCCH RF channel number. The BTS can transmit with different power levels on the frequency that carries the BCCH and on the frequencies that do not carry it. The power is specified at the Power Amplifier (PA) output, i.e. immediately after the transmitter unit and before the combiner. For RBS 200 the following is valid: GSM 900: 31 to 47 dBm, odd values only GSM 1800: 33 to 45 dBm, odd values only For RBS 2000 macro the following is valid: GSM 900 (TRU: KRC 131 47/01): 35 to 43 dBm, odd values only. GSM 900 (TRU: KRC 131 47/03): 35 to 47 dBm and 49, odd values only. 49 is used to activate the feature SW Power Boost. TX diversity is used and each TX supporting the mater-slave configuration is configured 47 dBm. An BTS with filter combiner does not support SW Power Boost. GSM 1800: 33 to 45 dBm and 47, odd values only. 47 is used to activate the feature SW Power Boost. TX diversity is used and each TX supporting the mater-slave configuration is configured 45 dBm. An BTS with filter combiner does not support SW Power Boost. GSM 1900: 33 to 45 dBm and 47, odd values only. 47 is used to activate the feature SW Power Boost. TX diversity is used and each TX supporting the mater-slave configuration is configured 45 dBm. An BTS with filter combiner does not support SW Power Boost.

Note: If one or more GSM TRU type KRC 131 47/01 is used within one site the maximum output power for that site shall be limited to 43 dBm. To ensure that, the parameter MPWR (see page 139) shall be set to 43 dBm for all TXs on that site.
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For RBS 2301 and 2302 (micro) the following is valid: GSM 900: 21 to 33 dBm and 35, odd values only. 35 is used to activate the feature SW Power Boost. TX diversity is used and each TX supporting the mater-slave configuration is configured 33 dBm. An BTS with filter combiner does not support SW Power Boost. GSM 1800: 21 to 33 dBm and 35, odd values only. 35 is used to activate the feature SW Power Boost. TX diversity is used and each TX supporting the mater-slave configuration is configured 33 dBm. An BTS with filter combiner does not support SW Power Boost. GSM 1900: 21 to 33 dBm and 35, odd values only. 35 is used to activate the feature SW Power Boost. TX diversity is used and each TX supporting the mater-slave configuration is configured 33 dBm. An BTS with filter combiner does not support SW Power Boost. For RBS 2401 indoor the following is valid: GSM 900: 7 to 19 dBm, odd values only. GSM 1800: 9 to 21 dBm, odd values only. CELL Type: String. Range: 1 to 7 characters except ALL. Unit: – Default: – Command: All commands where a specific cell is pointed out. Cell definition: RLDEI. Comments: Cell name. It is recommended to use the name of the site plus one more character that identifies the cell within the site. The best choice for this character is a number (1,2,3...) or a letter (A,B,C...) identifying the antenna pointing direction of the cell.
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The 0 (zero) degrees true north direction can be taken as a

reference. The cell whose antenna direction is closest to the reference direction when counting clockwise, should be assigned letter A (or number 1). NEWNAME Type: String. Range: 1 to 7 characters except ALL. Unit: – Default: – Command: RLDEC. Comments: The parameter is used to change the name of a cell. See parameter CELL for recommendations. The parameter is only allowed to be changed in cell state HALTED. CGI Type: MCC-MNC-LAC-CI. Range: MCC: 3 digits (Mobile Country Code). MNC: 2 or 3 digits, depending on MNCDIGITHAND, (see0), (Mobile Network Code). LAC: 1 to 65535 (Location Area Code). CI: 0 to 65535 (Cell Identity). Unit: – Default: – Command: RLDEC. Comments: CGI (Cell Global Identity) is the global identity of the cell in the whole system. It is composed of four different parameters: MCC, Mobile Country Code, MNC, Mobile Network Code identifying the PLMN (Public Land Mobile Network, i.e. the operator), LAC, Location Area Code, CI, Cell Identity within the location area. CGI is sent to the mobile station (MS) as a part of the system information message (GSM Rec. 04.08). The combination MCC-MNC-LAC is also known as the location area identity (LAI). The parameter is only allowed to be changed in cell state HALTED.
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BSIC Type: NCC-BCC. Range: NCC: 0 to 7 (Network Colour Code). BCC: 0 to 7 (Base station Colour Code). Unit: – Default: – Command: RLDEC. Comments: BSIC (Base Station Identity Code) is composed of two entities: NCC Network Colour Code. BCC Base station Colour Code, BSIC is defined on a per cell basis and it is sent on the logical synchronisation channel (SCH) on the BCCH frequency. GSM 03.03, Annex A, assigns one NCC value "n" to each

European country "to ensure that the same NCC is not used in the adjacent PLMNs". A second operator in a given country would use the NCC value "n+4". When an MS reports the results of the measurements made on the serving cell and the neighbouring cells, it indicates (GSM 04.08, section 10.5.2.20): The measured signal levels on the serving cell. The measured levels, the BSIC and the BCCH frequency of the neighbouring cells. Only measurements from cells with allowed NCC are reported (see section 0). The colour code NCC is then used to discriminate cells that use the same frequency. Though mainly intended for the purpose of differentiating PLMNs, it also serves to distinguish cells within one PLMN that use the same frequency provided they have been assigned different NCC. If there are two operators in a country, they can use more than two PLMN colour codes each one, provided that in border areas only the values "n" and "n+4" are used. What is stated here should be considered as general guidelines. Of course any type of NCC assignment must be decided by agreements between operators and countries. Regarding the protection against co-channel interference, the MS reports the BCC value so that the BSC can distinguish among different cells transmitting on the same frequency. For this purpose the BCC must be allocated as wisely as possible. If frequency reuse clusters are used then it is recommended that all
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BTSs in a given cluster use the same BCC. In this way the reuse distance of a certain BCC can be maximised according to the frequency reuse distance. Note that only 8 different values (BCC: 0 to 7) are used for the purpose of recognising co-channel interference. The parameter is only allowed to be changed in cell state HALTED. BCCHNO Type: Numeral. Range: 1 to 124 (GSM 900). 0, 975 to 1023 (GSM 900, G1) 512 to 885 (GSM 1800). 512 to 810 (GSM 1900). Unit: – Default: – Command: RLDEC. Comments: Absolute RF channel number for BCCH. Absolute RF channel number already defined for a dedicated channel can not be used. The frequency carrying the BCCH (Broadcast Control Channel) in a cell, is defined by the Absolute Radio Frequency Channel Number, ARFCN, with the parameter BCCHNO. The defined

ARFCN must be unique within the cell. According to the GSM 900 recommendations the channels are numbered as follows: fl(n) = 890.2 + 0.2*(n?1) in MHz, where n (Absolute Radio Frequency Channel Number, ARFCN) goes from 1 to 124 and fl is a frequency in the lower band, BTS receiver. fu(n) = fl(n) + 45 in MHz, where n goes from 1 to 124 and fu is a frequency in the upper band, BTS transmitter. According to the GSM 1800 recommendations the channels are numbered as follows: fl(n) = 1710.2 + 0.2*(n?512) in MHz, where n (Absolute Radio Frequency Channel Number, ARFCN) goes from 512 to 885 and fl is a frequency in the lower band, BTS receiver. fu(n) = fl(n) + 95 in MHz, where n goes from 512 to 885 and fu is a frequency in the upper band, BTS transmitter. According to the GSM 1900 recommendations the channels are numbered as follows:
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fl(n) = 1850.2 + 0.2*(n?512) in MHz, where n (Absolute Radio Frequency Channel Number, ARFCN) goes from 512 to 810 and fl is a frequency in the lower band, BTS receiver. fu(n) = fl(n) + 80 in MHz, where n goes from 512 to 810 and fu is a frequency in the upper band, BTS transmitter. BCCHTYPE Type: Identifier. Range: COMB, COMBC, NCOMB. Unit: – Default: NCOMB. Command: RLDEC. Comments: Type of BCCH. COMB indicates that the cell has a combined BCCH and SDCCH/4 (see section 0). COMBC indicates that the cell has a combined BCCH and SDCCH/4 with a CBCH subchannel. NCOMB indicates that the cell does not have any type of combined BCCH and SDCCH/4. The BCCH is always allocated to time slot number 0 (TN0) in the defined ARFCN. The CBCH is used for transmission of the messages when the function Short Messages Service Cell Broadcast (SMSCB) is activated in the cell. SMSCB enables the operator to submit short messages for broadcasting to a specific area within the PLMN. The parameter is only allowed to be changed in cell state HALTED. AGBLK Type: Numeral. Range: 0 to 7 if non-combined BCCH is used. 0 to 2 if combined BCCH and SDCCH/4 is used. Unit: –

Default: 1 Command: RLDEC. Comments: Number of reserved access grant blocks.
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Number of CCCH blocks reserved for the access grant channel. The remaining CCCH blocks are used for the paging channel. In each downlink non-combined SDCCH 51 frames multiframe there are 9 different CCCH blocks and in the combined BCCH/SDCCH there are 3 different blocks. They can be used to: ? Send paging messages, i.e. used as a Paging Channel. ? Send access granted messages, i.e. used as an Access Grant Channel. After an MS tunes to the BCCH/CCCH channel and decodes the System Information, it performs an evaluation that, taking into account the MS's own IMSI (International Mobile Station Identity) number, determines to which particular CCCH block in the physical channel it should listen (GSM 05.02). Every CCCH in the physical channel (Paging Subchannel) sends paging messages to a certain group of MSs that are called its paging group. The reason for the existence of such paging groups is that the MSs can save batteries because it only needs to listen to its own Paging Subchannel messages. The physical channel (Paging Subchannel) sends paging messages to a certain group of MSs. As mentioned before these very same CCCH blocks are also used to send Access Grant messages to the MSs, i.e. to answer a Random Access message that an MS wanting to access the system has sent to the system. The structure of the BCCH regarding Paging messages and Access Grant messages can be controlled by the two parameters AGBLK and MFRMS. AGBLK tells how many of the CCCH blocks that should be reserved for the Access Grant messages. In Ericsson’s GSM system, Access Grant messages are given priority over Paging messages. Together with MFRMS, AGBLK indicates how many paging groups there will be. With a non-combined BCCH and AGBLK = 1, there are 8 CCCH blocks in each multiframe. This means that it is possible to have 16 to 72 different Paging Subchannels, i.e. Paging Groups. (Since MFRMS can take values between 2 and 9.) With a combined BCCH/SDCCH and AGBLK = 1, there are 2 CCCH blocks in each multiframe. In this case it is possible to have 4 to 18 different Paging Groups. Note 1: AGBLK must not be 0 when SI 7 and 8 have to be sent or when short message service cell broadcast (SMSCB) is in use on a cell not using combined BCCH and SDCCH/4 (GSM 05.02).
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Note 2:

Only AGBLK = 0 and 1 is supported by the RBS 200 and RBS 2000 series BTS. The parameter is only allowed to be changed in cell state HALTED. MFRMS Type: Numeral. Range: 2 to 9. Unit: CCCH multiframes. Default: 6. Command: RLDEC. Comments: Multiframes period. Defines period of transmission for PAGING REQUEST messages to the same paging subgroup. Together with AGBLK, MFRMS determines the number of paging groups. MFRMS is also used by the MS to determine downlink signalling failure in idle mode (GSM 05.08). The downlink signalling failure criterion is based on the downlink signalling failure counter DSC. When the MS camps on a cell, DSC shall be initialised to a value equal to the nearest integer to 90/N where N is the MFRMS parameter for that cell. Thereafter, whenever the MS attempts to decode a message in its paging subchannel; if a message is successfully decoded DSC is increased by 1, (however never beyond the nearest integer to 90/N), otherwise DSC is decreased by 4. When DSC reaches 0, a downlink signalling failure shall be declared. A downlink signalling failure shall result in cell reselection. MFRMS is also used by the MS to control monitoring of received BCCH carrier level (GSM 05.08). Whilst in idle mode an MS shall continue to monitor all BCCH carriers as indicated in the BCCH allocation list (BA list). A running average of received level in the preceding 5 to Max{5, ((5*N+6) div 7)*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. The parameter is only allowed to be changed in cell state HALTED. FNOFFSET Type: Numeral.
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Range: 0 to 1325. Unit: TDMA frames. Default: 0. Command: RLDEC. Comments: Frame Number Offset. Indicates the time difference from the FN generator in the BTS. To prevent that all cells on a site send BCCH channels at the same time it is possible to define a deviation with respect to the FN generator called FNOFFSET. By using FNOFFSET on a synchronised two or three sector site the time for decoding

BSIC can be reduced. Note: The RBS2000 and RBS200 only support the range 0 to 1023. The parameter is only allowed to be changed in cell state HALTED. ECSC Type: Identifier. Range: NO, YES. Unit: – Default: NO. Command: RLSBC. Comments: Early Classmark Sending Control. Indicates if an MS in the cell is allowed to use early classmark sending. NO Early sending is not allowed. YES Early sending is allowed. Note: The parameter ECSC has to be set to YES in order to allow the MS to send the MS multiband and/or multislot capability. No multiband or multislot configuration will be established unless the MS capability is known. SCTYPE Type: Identifier. Range: UL, OL. Unit: – Default: –
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Command: Every command where subcell type need to be defined. A subcell structure is defined by the command RLDSI. Comments: Subcell type. UL The subcell type is underlaid. OL The subcell type is overlaid. A subcell structure can only be defined for an internal cell.

3.1.3 BSC exchange property data
MNCDIGITHAND Type: Numeral. Range: 0 to 2 Unit: ? Default: 0. Command: RAEPC, RAEPP. Comments: Indicates how the BSC handles MNC. 0: 2-digit MNC administered and sent, all cases. 1: 3-digit MNC administered and sent on the A-interface and Gb-interface and 2-digit MNC is sent on the airinterface. 2: 3-digit MNC administered and sent, all cases. If the value is 1 then the third MNC digit must have the value zero. Changing of the value from 2 to a lower value is only allowed if the third MNC digit is zero in all defined cells. If any cell exists with an MNC with the third digit not equal to zero, then this cell must be undefined before the property value can be changed from 2 to a lower value.

3.1.4 Cell/subcell data
These parameters may be defined different for underlaid and overlaid subcells. In case there is no subcell structure defined, they are defined per cell. TSC Type: Numeral. Range: 0 to 7. Unit: –
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Default: Base station colour code (BCC) part of the BSIC. Command: RLDTC. Comments: Training Sequence Code. The Training Sequence Code can only be changed for cells with a subcell structure. It is possible to change the TSC in a subcell (OL or UL) independently of the other subcell to be able to have different TSCs in the overlaid and underlaid subcells. However, it is recommended not to change TSC in UL subcells. MSTXPWR Type: Numeral. Range: 13 to 43 (GSM 900) odd values only. 4 to 30 (GSM 1800) even values only. 4 to 30 (GSM 1900) even values only. Unit: dBm. Default: – Command: RLCPC. Comments: Maximum transmit power for MS on connection. BSPWRT Type: Numeral. Range: 0 to 63. Unit: dBm. Default: – Command: RLCPC. Comments: Base Station output power in dBm for the non-BCCH RF channel numbers. For RBS 200 the following is valid: GSM 900: 31 to 47 dBm, odd values only GSM 1800: 33 to 45 dBm, odd values only For RBS 2000 macro the following is valid: GSM 900 (TRU: KRC 131 47/01): 35 to 43 dBm, odd values only. GSM 900 (TRU: KRC 131 47/03): 35 to 47 dBm and 49, odd values only. 49 is used to activate the feature SW Power Boost. TX
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diversity is used and each TX supporting the mater-slave configuration is configured 47 dBm. An BTS with filter

combiner does not support SW Power Boost. GSM 1800: 33 to 45 dBm and 47, odd values only. 47 is used to activate the feature SW Power Boost. TX diversity is used and each TX supporting the mater-slave configuration is configured 45 dBm. An BTS with filter combiner does not support SW Power Boost. GSM 1900: 33 to 45 dBm and 47, odd values only. 47 is used to activate the feature SW Power Boost. TX diversity is used and each TX supporting the mater-slave configuration is configured 45 dBm. An BTS with filter combiner does not support SW Power Boost. Note: If one or more GSM TRU type KRC 131 47/01 is used within one site the maximum output power for that site shall be limited to 43 dBm. To ensure that, the parameter MPWR (see page 139) shall be set to 43 dBm for all TXs on that site.

3.1.5 Channel group data
The channel group data must be given for each defined channel group. A channel group cannot be shared between different subcells. Frequency hopping can not be done between channel groups. CHGR Type: Numeral. Range: 0 to 15. Unit: – Default: 0 (for cells without a subcell structure). n/a (for overlaid subcells). 0 (for underlaid subcells). Command: RLCCC, RLDGI, and other commands in which a channel group can be given. Comments: Channel group number.
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A cell is divided into one or more channel groups which contain all physical channels on an arbitrary number of frequencies. Cells with a subcell structure must have at least one channel group defined in each subcell. A cell without a subcell structure is given CHGR = 0 by default. However, a cell planned with a subcell structure such as overlaid and underlaid subcells is given CHGR = 0 by default for the underlaid subcell. A maximum of 16 channel groups per cell can be defined for a cell. A total of 1024 channel groups may be defined per BSC. STATE

Type: Identifier. Range: ACTIVE, HALTED. Unit: – Default: ? Command: RLSTC, RLSTP . Comments: Cell or Channel Group state. ACTIVE The cell or channel group is active. HALTED The cell or channel group is halted. HOP Type: Identifier. Range: ON, OFF, TCH. Unit: – Default: OFF. Command: RLCHC, RLCFP. Comments: Frequency hopping status. ON The hopping status for the channel group is hopping for TCH and SDCCH. OFF The hopping status for the channel group is non hopping. TCH The hopping status for the channel group is hopping for TCH only. SDCCHs as well as TCHs can hop. A BCCH will not hop even if it belongs to a channel group defined as hopping. Note: If the cell state is ACTIVE when parameter HOP is changed, the TX will restart and calls might be dropped.
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HSN Type: Numeral. Range: 0 to 63. Unit: – Default: – Command: RLCHC, RLCFP. Comments: Hopping sequence number. The hopping BPC is transmitted on a set of frequencies included in a Hopping Frequency Set (HFS). The order of the frequencies to transmit on is defined by the hopping sequence number HSN, as described in GSM 05.02. HSN = 0 cyclic hopping sequence. HSN = 1 to 63 pseudo random sequences. NUMREQBPC Type: Numeral / Identifier. Range: 8 to 128 in steps of 8, SYSDEF. Unit: – Default: SYSDEF. Command: RLBDC. Comments: The number of required basic physical channels (BPCs) in a channel group. SYSDEF: System defined limit. The number of BPCs is defined by the number of frequencies in a channel group. DCHNO

Type: Numeral. Range: 1 to 124 (GSM 900). 0, 975 to 1023 (GSM 900 G1) 512 to 885 (GSM 1800). 512 to 810 (GSM 1900). Unit: ARFCN. Default: – Command: RLCFI, RLCFE. Comments: Absolute RF channel number.
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A maximum of 16 DCHNO per channel group can be defined except for channel group 0, which allows only 15 DCHNO. This is because one RF channel has to be reserved for the BCCH, which is defined by BCCHNO. A maximum of 31 DCHNO per cell can be defined in GSM 900. A maximum of 18 DCHNO per cell can be defined in GSM 1800 and GSM 1900 when the RF channel range is greater than 112. A maximum of 31 DCHNO per cell can be defined in GSM 1800 and GSM 1900 when the RF channel range is less than or equal to 112. SDCCH Type: Numeral. Range: 0 to 16 or 0 to 7, when parameter CCHPOS is set to BCCH, or 0 to 3, when parameter CCHPOS is set to BCCH and the cell is an extended range cell. Unit: – Default: 1, see below for details. Command: RLCCC. Comments: Required number of SDCCH/8. Call set up, location updating and SMS are using the SDCCH channel. The system supports four types of combination for SDCCH channels (see also 0): ? SDCCH/4: The SDCCH is combined with the BCCH in time slot 0 on the BCCH carrier. This SDCCH configuration provides 4 subchannels for signalling. Only one SDCCH/4 can be defined for each cell. (BCCHTYPE = COMB). ? SDCCH/4 including CBCH: One subchannel is replaced by a CBCH. This SDCCH/4 configuration provides 3 subchannels for signalling and one for transmission of 47SMSCB messages. (BCCHTYPE = COMBC). ? SDCCH/8: This SDCCH configuration provides 8 subchannels for signalling (BCCHTYPE = NCOMB, CBCH = NO). ? SDCCH/8 including CBCH: One subchannel is replaced by a CBCH. This SDCCH/8 configuration provides 7 subchannels for signalling and one for transmission of SMSCB messages (BCCHTYPE = NCOMB, CBCH = YES).

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By system default, one SDCCH/8 without CBCH is provided in the cell if the BCCH frequency for the cell is defined and the type of BCCH is non-combined. Note that the SDCCH/4 and its CBCH are specified together with the BCCH (see section 0). Up to 16 SDCCH/8 can be specified per cell. This number is reduced by one if an SDCCH/4 is defined for the cell. The number of SDCCH/8s in a cell can not be more than the number of TRXs within the cell. If TRXs are connected to a channel group (BSC command RXMOC), the number of SDCCH/8s in a channel group can not be more than the number of TRXs in that channel group. In case the required number of BPCs has been set by command, the number of SDCCHs can not exceed the required number of BPCs devided by 8. Note that by the function Adaptive Configuration of Logical Channels, the number of required SDCCHs in a cell can be automatically adapted depending on the demand for such channels (see section Adaptive Configuration of Logical Channels, page 131). The total number of SDCCH/8 in the cell can not be higher than the number of operational TRXC in the channel group. CCHPOS Type: Identifier. Range: BCCH, TN. Unit: – Default: TN. Command: RLCCC. Comments: Control channel position. Parameter CCHPOS can only be used for channel group zero. For other channel groups CCHPOS is always equal to TN and can not be changed. BCCH: All SDCCHs in channel group 0 will be placed on the BCCH frequency. This alternative is only valid for channel group 0. TN: The SDCCH(s) in the cell will be placed on the timeslot number entered with parameter TN. For CCHPOS = BCCH, the first SDCCH will be placed on timeslot number 1, the next will be placed on timeslot number 2 and so on. In this case, if parameter TN is entered, it does not affect the configuration. This implies that a maximum of 7 SDCCHs can be added for a normal and 3 SDCCHs for an extended range cell.
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TN Type: Numeral. Range: 0 to 3 (normal cell). 0, 2 (extended range cell). Unit: – Default: 2 Command: RLCCC.

Comments: Timeslot number where the SDCCH/8 will be located. TN is only valid for CCHPOS = TN and must be equal for all channel groups in a cell. CBCH Type: Identifier. Range: YES, NO. Unit: – Default: NO. Command: RLCCC. Comments: Cell broadcast channel. CBCH must not be defined for an overlaid subcell. YES CBCH shall be included in one of the SDCCH/8 for the cell or channel group. NO No SDCCH/8 for the cell or channel group shall include CBCH.
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3.2 Neighbouring cell relation data
3.2.1 Neighbouring cell relation data
There are two types of parameters that can be defined for each neighbouring cell relation; Hysteresis and Offset parameters. It is possible to define up to 64 neighbours for each cell. A total of up to 8192 neighbouring cell relations can be defined per BSC. CELLR Type: String. Range: 1 to 7 characters except ALL. Unit: – Default: – Command: RLNRI, RLNRC, RLNRE, RLNRP. Comments: Related cell designation. The identity of the neighbouring cell for which the set of parameters should be applied is specified by means of CELLR. The name of the neighbouring cell must be specified here. All internal neighbour relations are mutual unless explicitly specified. Example: If cell B is defined as a neighbour to cell A (CELLR = B) with certain values for the hysteresis and offset parameters then cell A is automatically defined as a neighbour to cell B with the same hysteresis values (symmetric relation) and the same absolute values but opposite sign for the offset parameters (antisymmetric relation). CTYPE Type: String. Range: EXT, Omitted. Unit: – Default: Omitted. Command: RLDEI, RLLHP, RLDEP. Comments: External cell. If the neighbouring cell belongs to another BSC then this must be specified explicitly by means of CTYPE.

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EXT The neighbouring cell is external. Omitted The neighbouring cell is internal. In addition CGI, BSIC, LEVEL, LEVTHR, LEVHYST, PSSTEMP, PTIMTEMP, BCCHNO, BSPWR, BSTXPWR, BSRXMIN, BSRXSUFF, MSTXPWR, MSRXMIN, MSRXSUFF, AW, SCHO, MISSNM and EXTPEN must be specified for an external neighbouring cell. These parameters are also defined in the neighbouring cell's home BSC. RELATION Type: String. Range: SINGLE, Omitted. Unit: – Default: Omitted. Command: RLNRI. Comments: The parameter is only specified when the relation is one way cell → cellr. This means that offset and hysteresis parameters are only defined in one direction. RELATION is always set to single for external cells, i.e. neighbouring cells that belong to another BSC. CS Type: String. Range: YES, NO. Unit: – Default: NO. Command: RLNRC. Comments: Co-site, which indicates if a cell shares the same site as its neighbour. Handover to an OL subcell is only allowed when the neighbour is co-sited with the serving cell. YES Cell is co-sited with neighbour. NO Cell is not co-sited with neighbour.

3.2.2 Additional parameters defined for neighbour cell relations
These parameters need to be defined, together with the parameters in section 3.2.1, for neighbour cell relations. They are defined by means of the command RLNRC.
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BQOFFSET AWOFFSET CAND Ericsson 1 locating algorithm: TRHYST KHYST LHYST TROFFSET KOFFSET LOFFSET Ericsson 3 locating algorithm: HIHYST

LOHYST HYSTSEP OFFSET

3.2.3 External neighbour cell data
These parameters need to be defined, together with the parameters in sections 3.2.1 and 3.2.2, for external neighbouring cells. If applicable, also values for the cell locating hierarchical data (see 3.16) shall be given. CGI BSIC BCCHNO MISSNM EXTPEN SCHO BSPWR BSTXPWR MSTXPWR BSRXMIN MSRXMIN BSRXSUFF MSRXSUFF AW LEVEL LEVTHR LEVHYST PSSTEMP PTIMTEMP
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3.3 Idle mode behaviour
3.3.1 Paging – MSC data
PAGREP1LA Type: Numeral. Range: 0 to 3. Unit: – Default: 2. Command: DBTSP:TAB=AXEPARS,SETNAME=GSMMMSC. Comments: Repeated paging in one location area. The parameter is optional. This parameter defines in case of mobile terminating calls how the paging in one location area is repeated. 0 Paging in one location area is not repeated. 1 Paging in one location area is repeated with either TMSI or IMSI. 2 Paging in one location area is repeated with IMSI. 3 Paging is repeated as global paging with IMSI. Note: This parameter is only defined for Ericsson MSCs. PAGREPGLOB Type: Numeral. Range: 0 to 1. Unit: –

Default: 0. Command: DBTSP:TAB=AXEPARS,SETNAME=GSMMMSC. Comments: Repeated global paging. The parameter is optional. This parameter defines how the global paging is repeated if the first paging attempt was global. 0 Global paging is not repeated. 1 Global paging is repeated with IMSI. Note: This parameter is only defined for Ericsson MSCs.
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PAGNUMBERLA Type: Numeral. Range: 1 to 3. Unit: – Default: 1. Command: MGEPC , MGEPP. Comments: Number of location areas in a paging message. This parameter indicates the maximum permitted amount of location areas that can be included in a paging message. The parameter is optional. A parameter with a value > 1 is only valid if all BSCs connected to an MSC/VLR support a paging message with a list of location areas. Note: This parameter is only defined for Ericsson MSCs. PAGTIMEFRST1LA Type: Numeral. Range: 2 to 10. Unit: s. Default: 4. Command: MGEPC , MGEPP. Comments: Time supervision for the first paging in one location area. This parameter defines the time supervision for the page response of the first paging attempt in one location area. After expiration of this timer the paging is repeated according to parameter PAGREP1LA. The parameter is optional. Note: This parameter is only defined for Ericsson MSCs. PAGTIMEFRSTGLOB Type: Numeral. Range: 2 to 10. Unit: s. Default: 4. Command: MGEPC , MGEPP. Comments: Time supervision for the first global paging.
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This parameter defines the time supervision for the page response of the first global paging attempt. After expiration of this timer the paging is repeated according to parameter PAGREPGLOB. The parameter is optional. Note: This parameter is only defined for Ericsson MSCs.

PAGTIMEREP1LA Type: Numeral. Range: 2 to 10. Unit: s. Default: 7. Command: MGEPC , MGEPP. Comments: Time supervision for the repeated paging in one location area. The parameter is optional. This parameter defines the time supervision for the page response of repeated paging in one location area. After expiration of this timer no new paging repetition for this call is done. Note: This parameter is only defined for Ericsson MSCs. PAGTIMEREPGLOB Type: Numeral. Range: 2 to 10. Unit: s. Default: 7. Command: MGEPC , MGEPP. Comments: Time supervision for the repeated global paging. The parameter is optional. This parameter defines the time supervision for page response of repeated global paging. After expiration of this timer no new paging repetition for this call is done. Note: This parameter is only defined for Ericsson MSCs.

3.3.2 LATA administration - MSC data
The following exchange properties are valid only if the function Equal Access and Transit Network Selection in MSC/VLR and GMSC is implemented. This is an optional GSM 1900 function.
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LATAUSED Type: Numeral. Range: 0, 1. Unit: Default: 0. Command: MGEPC , MGEPP. Comments: Defines the usage of LATA administration. 0 = LATA administration is not used. 1 = LATA administration is used. The parameter is optional. Note: This parameter is only defined for Ericsson MSCs. PAGLATA Type: ?. Range: 0, 1. Unit: Default: 0. Command: DBTSP:TAB=AXEPARS,SETNAME=GSMMMSC. Comments: Indicates if LATA paging is used for mobile terminating calls or not. 0 = LATA paging is not used. 1 = LATA paging is used.

This parameter is only valid if parameter LATAUSED = 1. The parameter is optional. Note: This parameter is only defined for Ericsson MSCs. PAGREPCT1LA Type: Numeral. Range: 0 to 3. Unit: Default: 2. Command: DBTSP:TAB=AXEPARS,SETNAME=GSMMMSC. Comments: Defines how the paging is repeated in one location area. 0 = Paging in one location area is not repeated.
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1 = Paging in one location area is repeated with either TMSI or IMSI. 2 = Paging in one location area is repeated with TMSI. 3 = Paging is repeated as call delivery LATA paging with IMSI. This parameter is only valid if parameter PAGLATA = 1. The parameter is optional. Note: This parameter is only defined for Ericsson MSCs. PAGTIMEREPLATA Type: Numeral. Range: 2 to 10. Unit: s. Default: 7. Command: MGEPC , MGEPP. Comments: Defines the time supervision for page response of repeated LATA paging. After expiration of this timer no new paging repetition for this call is done. This parameter is only valid if parameter PAGLATA = 1. The parameter is optional. Note: This parameter is only defined for Ericsson MSCs.

3.3.3 Implicit detach – MSC data
BTDM Type: Numeral. Range: 6 to 1530 in steps of 6, OFF. Unit: min. Default: OFF. Command: MGIDP , MGIDI. Comments: Base time duration of implicit detach of a mobile subscriber by the network. BTDM must be as long as the longest periodic updating time (T3212) in the interworking BSCs. The supervision time is the sum of BTDM and GTDM. Note: This parameter is only defined for Ericsson MSCs.
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GTDM Type: Numeral. Range: 0 to 255. Unit: min.

Default: – Command: MGIDP , MGIDI. Comments: Guard time duration. The guard time is used to prevent unnecessary marking of MS as implicit detached. Note: This parameter is only defined for Ericsson MSCs.

3.3.4 Automatic deregistration – MSC data
TDD Type: Numeral. Range: 1 to 255, OFF. Unit: days. Default: OFF. Command: MGADI. Comments: Automatic deregistration supervision time. Offers the possibility to automatically deregister mobile subscribers that have had no radio contact during a certain period of time in the MSC/VLR. Note: This parameter is only defined for Ericsson MSCs.

3.3.5 Idle mode behaviour – cell data
These parameters are sent in the System Information on BCCH & SACCH. ACCMIN Type: Numeral. Range: 47 to 110. Unit: See comments. Default: 110. Command: RLSSC.
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Comments: Minimum received signal level in dBm at the MS for permission to access the system. 47 greater than ?48 dBm (level 63) 48 ?49 to ?48 dBm (level 62) ··· 108 ?109 to ?108 dBm (level 2) 109 ?110 to ?109 dBm (level 1) 110 less than ?110 dBm (level 0) In Ericsson’s GSM system, the MS power can be controlled by the parameter CCHPWR, which indicates the maximum transmitter power that the MS is allowed to use when performing an access to the system (GSM 03.22). Whilst in idle mode, the MS continuously confirms that it has chosen the most appropriate cell by calculating the quantity C1 from the received signal level rxlev: C1 = (rxlev ? ACCMIN) ? max (CCHPWR ? P, 0) The MS camps on the cell providing the highest positive C1. The condition states that an MS must measure a signal strength higher than ACCMIN from a cell to be able to access the system via this cell. In addition, if the MS maximum possible output power, P, is lower than CCHPWR then the requirement on the signal

strength increases by the difference between P and CCHPWR. This means that if the MS cannot reach the maximum output power then the requirement on the signal strength in the downlink is harder. In this case, the measured cell is probably not designed for MSs of that class. A low value of ACCMIN means that the coverage in idle mode is improved at the expense of the risk of having an increased number of call set-up failures. CCHPWR Type: Numeral. Range: 13 to 43 in steps of 2 (GSM 900). 4 to 30 in steps of 2 (GSM 1800). 4 to 30 in steps of 2 (GSM 1900). Unit: dBm. Default: – Command: RLSSC. Comments: Maximum transceiver power level an MS may use when accessing on a control channel.
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CRH Type: Numeral. Range: 0 to 14 in steps of 2. Unit: dB. Default: 4. Command: RLSSC. Comments: Cell Reselection Hysteresis. Receiving signal strength (rxlev) hysteresis for required cell re-selection over location area border. Each change of location area requires a location update to be performed, which increases signalling load. In order to prevent ping-pong effects for cell selection across location area borders, a hysteresis, defined by CRH, is used. A cell in a different location area is only selected if it is “better” in terms of the quantity C2 for GSM phase 2 mobiles or C1 for GSM phase 1 mobiles, than the cells in the current location area by at least the value of CRH during a period of 5 seconds. The C2 criterion is given in the description of parameter CRO. (GSM 03.22). NCCPERM Type: Numeral. Range: 0 to 7. Unit: – Default: – Command: RLSSC. Comments: PLMN (NCC) Permitted. Defines the allowed NCCs (Network Colour Code) on the BCCH carriers for which the MS is permitted to send measurement reports. Up to 8 NCCs can be defined (GSM 04.08, section 10.5.2.15). See also section 0.

SIMSG Type: Numeral. Range: 1, 7, 8. Unit: – Default: ?
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Command: RLSMC, RLSMP. Comments: System Information BCCH Message. When the cell is connected to a BTS equipment that supports GSM phase 2 system information, it is possible to turn on or off the distribution of System Information Messages 1, 7, and 8. SIMSG is the pointer which specifies the System Information Message to be turned on or off by the parameter MSGDIST. MSGDIST must be specified for each one of the System Information Messages. Note 1: Channel group 0 has to be in state ACTIVE when this parameter is set. Note 2: The parameter AGBLK must not be zero when system information types 7 and 8 are sent. Example of parameter settings: SIMSG = 1 MSGDIST = ON SIMSG = 7 MSGDIST = OFF SIMSG = 8 MSGDIST = OFF MSGDIST Type: Identifier. Range: ON, OFF. Unit: – Default: see comments. Command: RLSMC, RLSMP. Comments: System Information BCCH Message distribution. ON System Information BCCH Message is distributed. OFF System Information BCCH Message is not distributed. Recommended default settings: MSGDIST type 1 = ON MSGDIST type 7 = OFF MSGDIST type 8 = OFF Note: Channel group 0 has to be in state ACTIVE when this parameter is set. CB Type: Identifier. Range: YES, NO.
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Unit: – Default: NO. Command: RLSBC. Comments: Cell Bar Access. Defines whether the cell is barred for access or not. NO The cell is not barred for access. YES The cell is barred for access.

It is possible to use CB to bar a cell (GSM 03.22 and 05.08). When a cell is barred it is ignored by MSs in idle mode but an active MS can perform handover to it. CBQ Type: Identifier. Range: HIGH, LOW. Unit: – Default: HIGH. Command: RLSBC. Comments: Cell Bar Qualify. HIGH: The cell has high priority LOW: The cell has low priority For GSM phase 2 MSs, a cell can be given two levels of priority. This is controlled by the parameter CBQ in conjunction with CB, as shown in below table. The interpretation of CB and CBQ varies depending on whether the MS is a phase 1 MS or a phase 2 MS. For phase 2 MSs the behaviour is also different in cell selection compared to cell reselection. CBQ CB Phase 2 MS Phase 1 MS Cell sel. Cell resel. Cell sel./resel. HIGH NO normal normal normal HIGH YES barred barred barred LOW NO low priority normal normal LOW YES low priority normal barred In idle mode the MS looks for suitable cells to camp on by checking cells in descending order of received signal strength. If a suitable cell is found, the MS camps on it. At cell selection
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with a phase 2 MS, cells can have two levels of priority, suitable cells which are of low priority are only camped on if there are no other suitable cells of normal priority (GSM 03.22). ACC Type: Numeral/Identifier. Range: 0 to 15, CLEAR. Unit: – Default: CLEAR. Command: RLSBC. Comments: Access Control Class. Defines which access classes that are barred. Up to 16 access classes can be defined. Class 10 defines emergency call in the cell. 0 to 9 Access classes that are barred. 10 Emergency call not allowed for MSs belonging to classes 0 to 9. 11 to 15 Access classes that are barred. CLEAR No access classes are barred. It may be of interest to the operator to bar the access to the system to a certain type of MS. For this purpose it is possible to define up to 16 different access classes of MSs and then select

the classes that can not access a cell by means of ACC (GSM 04.08, section 10.5.2.17). The classes are defined according to GSM 02.11. Classes 0 to 9 are reserved for the operator to be used for normal subscribers (home and visiting subscribers). Classes 11 to 15 are defined as follows: 11 PLMN use. 12 Security Services. 13 Public utilities. 14 Emergency services. 15 PLMN staff. MAXRET Type: Numeral. Range: 1, 2, 4, 7. Unit: – Default: 4. Command: RLSBC.
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Comments: Maximum retransmissions. Defines maximum number of retransmissions an MS may do when accessing the system on RACH. TX Type: Numeral. Range: 3 to 12, 14, 16, 20, 25, 32, 50. Unit: – Default: 50. Command: RLSBC. Comments: TX-integer. Defines the number of timeslots over which the MS may spread transmission when accessing the system. When the MS accesses the system it can spread the transmission over a certain number of timeslots. The parameter TX that the MS receives as a part of the system information message (GSM 04.08, section 10.5.2.29) is used to calculate the time interval between successive transmissions. The MS sends maximumMAXRET+1 Channel Request messages on the RACH to the BTS in a way such that (GSM 04.08, section 3.3.1.2): ? the number of slots belonging to the mobile station's RACH between initiation of the immediate assignment procedure and the first Channel Request message (excluding the slot containing the message itself) is a value drawn randomly for each new initial assignment initiation with uniform probability distribution in the set {0, 1, ..., max(TX,8)?1}. ? the number of slots belonging to the mobile station's RACH between two successive Channel Request messages (excluding the slots containing the messages themselves) is a value drawn randomly for each new transmission with uniform probability distribution in the set {S, S+1, ..., S+TX?1}, where S is a parameter depending on

the CCCH-configuration and - for GSM phase 2 mobiles - on the value of TX as defined in the table below.
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TX S for GSM phase 2 MSs non combined CCCH combined CCCH/SDCCH 3, 8, 14, 50 55 41 4, 9, 16 76 52 5, 10, 20 109 58 6, 11, 25 163 86 7, 12, 32 217 115 Example (GSM phase 2 MS): If the cell has a non combined CCCH and TX=7 then the interval between each retransmission may be 1 second (217 RACH slots), 1 sec. + 4.615 ms, 1 sec. + 2*4.615 ms, ··· 1 sec. + 6*4.615 ms. For GSM phase 1 mobiles, S takes the following values: - 0.25 seconds in case of non-combined CCCH. - 0.35 seconds in case of combined CCCH/SDCCH. ATT Type: Identifier. Range: YES, NO. Unit: – Default: YES. Command: RLSBC. Comments: Attach-detach allowed. NO MSs in the cell are not allowed to apply IMSI attach and detach. YES MSs in the cell should apply IMSI attach and detach. ATT tells the MS if it is allowed to apply IMSI attach and detach, i.e. if the MS is allowed to send a message to the system every time it is turned on or off (GSM 04.08, section 10.5.2.11). T3212 Type: Numeral. Range: 0 to 255. Unit: Deci hours.
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Default: 40. Command: RLSBC. Comments: T3212 time-out value. Note: See the corresponding MSC parameter BTDM at page 33. Defines the time-out value that controls the location updating procedure, i.e. when notifying the availability of the MS to the network. (GSM 04.08, section 10.5.2.11).

0 Infinite time-out. 1 0.1 hours. ··· 255 25.5 hours. CRO Type: Numeral. Range: 0 to 63. Unit: dB. Default: 0. Command: RLSBC. Comments: Cell Reselection Offset. Defines an offset to encourage or discourage MSs to select the cell while it is camping on another cell, i.e. perform a cell reselection. 0 0dB 1 2dB ··· 63 126 dB. In order to optimise cell reselection, the additional cell reselection parameters CRO, TO, and PT are broadcast on the BCCH of each cell. The cell reselection process employs a quantity C2 for GSM phase 2 MSs, which depends on these parameters (GSM 03.22). GSM phase 1 MSs use the quantity C1 for cell reselection instead, i.e. these mobiles do not experience an offset. The reselection quantity C2 is defined as: C2 = C1 + CRO ? TO * H(PT ? T) forPT ≠ 31 C2 = C1 ? CRO for PT = 31 where H(x) = 0 for x < 0 = 1 for x ≥ 0
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T is the timer, started from zero at the point at which the cell was placed by the MS on the list of strongest carriers. T is reset to zero whenever the cell is no longer on the list of strongest carriers. This will tend to prevent fast moving MSs from selecting the cell (GSM 03.22). The quantity C1 is given in the description of parameter ACCMIN (page 34). CRO applies an offset to the C2 reselection criterion for the cell. TO applies a negative offset to C2 for the duration of PT after the timer has started for the cell. PT is the duration for which TO applies. The value 31 of the PT parameter is reserved to change the sign of CRO and the value of TO is ignored as indicated by the equation defining C2. These parameters are used to ensure that the MS is camped on the cell with which it has the probability of successful communication on uplink and downlink (GSM 05.08). Note: The setting of this parameter only affects GSM phase 2

MSs. TO Type: Numeral. Range: 0 to 7. Unit: dB. Default: 0. Command: RLSBC. Comments: Temporary Offset. Defines a negative offset applied to CRO. 0 0dB 1 10dB ··· 6 60dB 7 infinite. Note: The setting of this parameter only affects GSM phase 2 MSs. PT Type: Numeral. Range: 0 to 31.
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Unit: -. Default: 0. Command: RLSBC. Comments: Penalty Time. Defines duration for which TO is applied. 0 20 seconds 1 40 seconds ··· 31 620 seconds. The value 31 indicates that the cell reselection offset is negative and that the temporary offset is ignored. Note: The setting of this parameter only affects GSM phase 2 MSs.

3.4 Locating
3.4.1 Intra-MSC handover – MSC data
Intra-MSC handover is a handover between BSCs within the MSC. These parameters are valid both for anchor and non-anchor MSCs. HNDRELCHINTRA Type: Numeral. Range: 0, 1 Unit: – Default: 1 Command: MGEPC , MGEPP. Comments: Channel release in intra-MSC inter-BSC handover. HNDRELCHINTRA defines the release of the original channel after expiration of the timer HNDTCMDINTRA for handover time supervision in intra-MSC inter-BSC handover. The parameter is optional. 0 The handover signalling is terminated and the call continues on the original channel.

1 The original channel is released. Note: This parameter is only defined for Ericsson MSCs.
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HNDSDCCH Type: Numeral. Range: 0, 1 Unit: – Default: 1 Command: MGEPC , MGEPP. Comments: Intra-MSC inter-BSC handover on signalling channels. The parameter is optional. HNDSDCCH determines if intra-MSC inter-BSC handover is allowed on signalling channels: 0 Intra-MSC inter-BSC handover is not allowed on signalling channels. 1 Intra-MSC inter-BSC handover is allowed on signalling channels. Note: This parameter is only defined for Ericsson MSCs. HNDSDCCHTCH Type: Numeral. Range: 0, 1 Unit: – Default: 1 Command: MGEPC , MGEPP. Comments: Intra-MSC inter-BSC handover from signalling to traffic channel. The parameter is optional. HNDSDCCHTCH determines if intra-MSC inter-BSC handover is allowed from signalling to traffic channel: 0 Intra-MSC inter-BSC handover is not allowed from signalling to traffic channel. 1 Intra-MSC inter-BSC handover is allowed from signalling to traffic channel. Note: This parameter is only defined for Ericsson MSCs. HNDTCMDINTRA Type: Numeral. Range: 5 to 120 Unit: Seconds with 1 sec intervals.
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Default: 15 Command: MGEPC , MGEPP. Comments: Time supervision in intra-MSC inter-BSC handover. The parameter is optional. HNDTCMDINTRA describes the time between the HANDOVER COMMAND and HANDOVER COMPLETE messages in intra-MSC inter-BSC handover (according to T102 in GSM 03.09). Note: This parameter is only defined for Ericsson MSCs. HNDTGSOPINTRA Type: Numeral.

Range: 0 to 2500. Unit: Milliseconds with 20 ms intervals. Default: 80 Command: MGEPC , MGEPP. Comments: Time supervision of switching moment of the group switch (GS) in the MSC at intra-MSC inter-BSC handover. The parameter is optional. The parameter is only valid and can only be changed if the time supervision is used to define the operation point of the GS. Timer is started at sending of Handover Command message. 0 no time supervision which means GS is changed at reception of “handover detect” message or “handover complete” message. The path in the GS in the MSC will be changed at the first occurrence of the following event: – timer expiry. – reception of HANDOVER DETECT from the target BSC. – reception of HANDOVER COMPLETE from the target BSC. Note: This parameter is only defined for Ericsson MSCs.

3.4.2 Inter-MSC handover in anchor MSC – MSC data
HNDSDCCHINTO Type: Numeral. Range: 0, 1 Unit: – Default: 1
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Command: MGEPC , MGEPP. Comments: Outgoing inter-MSC handover on signalling channels in anchor MSC. The parameter is optional. It determines if outgoing inter-MSC handover is allowed on signalling channels in anchor MSC. The parameter is only valid if the inter-MSC handover dialogue is established with MAP version 2. 0 Outgoing inter-MSC handover is not allowed on signalling channels. 1 Outgoing inter-MSC handover is allowed on signalling channels. Note: This parameter is only defined for Ericsson MSCs. HNDBEFOREBANSW Type: Numeral. Range: 0, 1. Unit: – Default: 1. Command: MGEPC , MGEPP. Comments: Handover before B-answer. The parameter is optional. The parameter indicates if an inter-MSC handover is allowed on traffic channels before answer from B-subscriber. 0 Not allowed. 1 Handover allowed. Note: This parameter is only defined for Ericsson MSCs.

3.4.3 Inter-MSC handover in non-anchor MSC – MSC data

HNDSDCCHINTI Type: Numeral. Range: 0, 1. Unit: – Default: 1. Command: MGEPC , MGEPP. Comments: Incoming inter-MSC handover on signalling channels in nonanchor MSC. The parameter is optional.
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It determines if incoming inter-MSC handover is allowed on signalling channels in non-anchor MSC. The parameter is only valid if the inter-MSC handover dialogue has been established with MAP version 2 by the anchor MSC. 0 Incoming inter-MSC handover is not allowed on signalling channels. 1 Incoming inter-MSC handover is allowed on signalling channels. Note: This parameter is only defined for Ericsson MSCs.

3.4.4 BSC exchange property data
FASTASSIGN Type: Numeral. Range: 0, 1. Unit: – Default: 0. Command: RAEPC. Comments: FASTASSIGN specifies if Locating shall wait until reception of the first measurement results before sending the requested candidate list. 0 Wait for measurement results. 1 Do not wait for measurement results. If no measurements are available and FASTASSIGN = 1, a candidate list that only contains the serving cell is created and sent. NOOFPHYSINFOMSG Type: Numeral. Range: 0 to 254. Unit: – Default: 35. Command: RAEPC. Comments: NOOFPHYSINFOMSG indicates the maximum number of repetitions of physical information messages during the handover procedure (NY1, see GSM 04.08, section 3.4.4).
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TIMER3105 Type: Numeral. Range: 0 to 254. Unit: 10 ms. Default: 4. Command: RAEPC.

Comments: TIMER3105 indicates the time between repetition of physical information messages during the handover procedure (T3105, see GSM 04.08, section 3.4.4). Note: Base stations of the RBS 200 series only support a range of 4 to 254.

3.4.5 Algorithm selection – BSC data
EVALTYPE Type: Numeral. Range: 1, 3. Unit: – Default: 1. Command: RLLBC. Comments: Evaluation type. EVALTYPE allows for the use of two different types of locating algorithm. 1 Cell ranking by the Ericsson1 locating algorithm. 3 Cell ranking by the Ericsson3 locating algorithm. The Ericsson3 locating algorithm is simplified compared to the Ericsson1 algorithm.

3.4.6 Flow control – BSC data
TINIT Type: Numeral. Range: 0 to 120. Unit: SACCH periods (480 ms). Default: 10. Command: RLLBC.
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Comments: Minimum time before handover is allowed on an initial call or after handover. The locating comparison is performed every SACCH period (480 ms), except for certain periods for which the maximum lengths are specified by the parameters: TINIT, TALLOC and TURGEN. They apply to different situations. The locating process is suspended during a time specified by TINIT. TALLOC Type: Numeral. Range: 0 to 120. Unit: SACCH periods (480 ms). Default: 2. Command: RLLBC. Comments: Minimum time between allocation attempts when there is a better cell condition and when the first allocation attempt has failed. In the case a handover, intra cell handover or overlaid/underlaid subcell change fails due to congestion, the locating process continues but no handover candidate list will be prepared before the timer TALLOC has expired, unless an urgency state is detected. TURGEN

Type: Numeral. Range: 0 to 120. Unit: SACCH periods (480 ms). Default: 2. Command: RLLBC. Comments: Minimum time between allocation attempts at an urgency condition and when the first allocation attempt has failed. In the case an urgency handover attempt fails due to congestion, the locating process will proceed and even a handover candidate list will be prepared. However the candidate list will not be transferred to the handover function during the time specified by the parameter TURGEN, unless the candidate list contains a better cell.
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3.4.7 Filter control – BSC data
TAAVELEN Type: Numeral. Range: 1 to 20. Unit: – Default: 4. Command: RLLBC. Comments: Timing advance average length. Number of values in the averaging of timing advance. For the evaluation of timing advance the algorithm uses a sliding window, the length of which is determined by TAAVELEN. TAAVELEN determines the total number of values to be used in the moving average.

3.4.8 Filter control – cell data
The measurement results are sent from the BTS to the BSC every SACCH period (480 ms) starting when the MS is assigned an SDCCH. The measurement results are stored and filtered in the BSC. The signal strength and quality measurements are filtered in order to smooth out measurement noise. In addition, some fading components of a duration of about the same as the filter response time, are filtered out. When filtering measurements for a cell, always the filters that are assigned to the cell are used. This means that serving cell and neighbouring cell measurements can be evaluated by different filters, if different filters are assigned to the different cells. The locating filters are numbered from 1 to 9, and correspond to different filter types: 1 to 5 General FIR filters. 6 Straight average filter. 7 Exponential filter. 8 First order Butterworth filter. 9 Median filter. Note: For a multislot configuration, only the main channel is evaluated. The reported downlink quality measurement on the main channel is the worst quality measured among all the uni-directional channels and the main channel. SSEVALSD Type: Numeral.

Range: 1 to 9. Unit: –
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Default: 6. Command: RLLFC. Comments: Signal strength filter for speech/data. The filters for down- and uplink signal strength in serving cell and downlink signal strength from neighbouring cells are selected by SSEVALSD for the channel mode speech/data. QEVALSD Type: Numeral. Range: 1 to 9. Unit: – Default: 6. Command: RLLFC. Comments: Quality filter for speech/data. The filters for quality in down- and uplink in the serving cell are selected by QEVALSD for the channel mode speech/data. SSEVALSI Type: Numeral. Range: 1 to 9. Unit: – Default: 6. Command: RLLFC. Comments: Signal strength filter for signalling only. The filters for down- and uplink signal strength in serving cell and downlink signal strength from neighbouring cells are selected by SSEVALSI for the channel mode signalling only. QEVALSI Type: Numeral. Range: 1 to 9. Unit: – Default: 6. Command: RLLFC. Comments: Quality filter for signalling only.
RADIO NETWORK PARAMETERS & CELL DESIGN DATA FOR ERICSSON’S GSM SYSTEM 90/1553-HSC 103 12 Uen Rev B 2001-02-01 53(163)

The filters for quality in down- and uplink in the serving cell are selected by QEVALSI for the channel mode signalling only. SSLENSD Type: Numeral. Range: 1 to 20. Unit: SACCH periods (480 ms). Default: 10. Command: RLLFC. Comments: Length of signal strength filter for speech/data. SSLENSD shall be specified only when SSEVALSD is in the range 6 to 9. QLENSD Type: Numeral.

Range: 1 to 20. Unit: SACCH periods (480 ms). Default: 10. Command: RLLFC. Comments: Length of quality filter for speech/data. QLENSD shall be specified only when QEVALSD is in the range 6 to 9. SSLENSI Type: Numeral. Range: 1 to 20. Unit: SACCH periods (480 ms). Default: 4. Command: RLLFC. Comments: Length of signal strength filter for signalling only. SSLENSI shall be specified only when SSEVALSI is in the range 6 to 9. QLENSI Type: Numeral. Range: 1 to 20.
RADIO NETWORK PARAMETERS & CELL DESIGN DATA FOR ERICSSON’S GSM SYSTEM 54(163) 90/1553-HSC 103 12 Uen Rev B 2001-02-01

Unit: SACCH periods (480 ms). Default: 4. Command: RLLFC. Comments: Length of quality filter for signalling only. QLENSI shall be specified only when QEVALSI is in the range 6 to 9. SSRAMPSD Type: Numeral. Range: 1 to 20. Unit: SACCH periods (480 ms). Default: 5. Command: RLLFC. Comments: Ramping length of signal strength filter for speech/data. SSRAMPSD shall be specified only when SSEVALSD is in the range 6 to 9. SSRAMPSI Type: Numeral. Range: 1 to 20. Unit: SACCH periods (480 ms). Default: 2. Command: RLLFC. Comments: Ramping length of signal strength filter for signalling only. SSRAMPSI shall be specified only when SSEVALSI is in the range 6 to 9. MISSNM Type: Numeral. Range: 0 to 18. Unit: – Default: 3. Command: RLLOC.

RADIO NETWORK PARAMETERS & CELL DESIGN DATA FOR ERICSSON’S GSM SYSTEM 90/1553-HSC 103 12 Uen Rev B 2001-02-01 55(163)

Comments: Maximum number of consecutive missing measurements for a serving cell or neighbouring cell permitted before all old measurements are considered invalid. If a measurement report from a neighbouring BTS is missing, that neighbour is not included in the evaluation. When a new measurement report containing information about that BTS is received, the missing values are linearly interpolated. But the interpolation is only allowed if the number of missing measurements is equal to or smaller than a certain number that is determined by MISSNM. When the number of missing measurements exceeds MISSNM all former measurements from that BTS are discarded and the evaluation of that BTS starts again when a new value arrives. If an urgency condition occurs and there are no neighbouring cells in the current measurement, the last received measurement containing neighbours is used. If the number of missing measurements exceeds the parameter MISSNM the old measurements are considered invalid. If a measurement from serving cell is missing, locating is suspended until the serving cell measurements start again.

3.4.9 Basic ranking – cell data
BSPWR Type: Numeral. Range: 0 to 80. Unit: dBm. Default. – Command: RLLOC. Comments: BSPWR is the BTS output power on the BCCH frequency. BSPWR is defined at the reference point used in the locating algorithm. MSRXMIN Type: Numeral. Range: 0 to 150. Unit: dBm (negative). Default: – Command: RLLOC.
RADIO NETWORK PARAMETERS & CELL DESIGN DATA FOR ERICSSON’S GSM SYSTEM 56(163) 90/1553-HSC 103 12 Uen Rev B 2001-02-01

Comments: Minimum required signal strength received at the MS in a given cell to consider the cell as a possible candidate for handover. MSRXMIN takes a positive value, which represents the corresponding negative value in calculations. BSRXMIN Type: Numeral. Range: 0 to 150. Unit: dBm (negative). Default: – Command: RLLOC. Comments: Minimum required signal strength received at the BTS, at the

reference point, to consider the cell as a possible candidate for handover. BSRXMIN takes a positive value, which represents the corresponding negative value in calculations. MSRXSUFF Type: Numeral. Range: 0 to 150. Unit: dBm (negative). Default: – Command: RLLOC. Comments: Sufficient signal strength received at the MS to consider the cell selectable for further ranking according to the magnitude of the path loss. MSRXSUFF takes a positive value which represents the corresponding negative value in calculations. BSRXSUFF Type: Numeral. Range: 0 to 150. Unit: dBm (negative). Default: – Command: RLLOC.
RADIO NETWORK PARAMETERS & CELL DESIGN DATA FOR ERICSSON’S GSM SYSTEM 90/1553-HSC 103 12 Uen Rev B 2001-02-01 57(163)

Comments: Sufficient signal strength received at the BTS, at the reference point, to consider the cell selectable for further ranking according to the magnitude of the path loss. BSRXSUFF takes a positive value, which represents the corresponding negative value in calculations.

3.4.10 Basic ranking – cell/subcell data
This parameter may be defined different for underlaid and overlaid subcell. In case there is no subcell structure defined, it is defined per cell. BSTXPWR Type: Numeral. Range: 0 to 80. Unit: dBm. Default: – Command: RLLOC. Comments: BSTXPWR is the BTS output power on all frequencies other than the BCCH frequency. BSTXPWR is defined at the reference point used in the locating algorithm.

3.4.11 Basic ranking – neighbour cell data
Parameters for the Ericsson1 locating algorithm KHYST Type: Numeral. Range: 0 to 63. Unit: dB. Default: 3. Command: RLNRC. Comments: Signal strength hysteresis when evaluating K-cells. KHYST is the hysteresis for cell borders defined by the signal

strength criterion. It is defined as a cell to cell relation. i.e. in each cell it can be defined individually for each neighbour that has been defined for that cell. KHYST is a symmetrical relation parameter, i.e. the same value applies for both directions of the cell to cell relation.
RADIO NETWORK PARAMETERS & CELL DESIGN DATA FOR ERICSSON’S GSM SYSTEM 58(163) 90/1553-HSC 103 12 Uen Rev B 2001-02-01

Note: KHYST is only valid for the Ericsson1 locating algorithm. LHYST Type: Numeral. Range: 0 to 63. Unit: dB. Default: 3. Command: RLNRC. Comments: Path loss hysteresis when evaluating L-cells. LHYST is the hysteresis for cell borders defined by the path loss criterion. It is defined as a cell to cell relation. i.e. in each cell it can be defined individually for each neighbour that has been defined for that cell. LHYST is a symmetrical relation parameter, i.e. the same value applies for both directions of the cell to cell relation. Note: LHYST is only valid for the Ericsson1 locating algorithm. TRHYST Type: Numeral. Range: 0 to 63. Unit: dB. Default: 2. Command: RLNRC. Comments: Signal strength hysteresis for a K- and L-cell border segment. Note: TRHYST is only valid for the Ericsson1 locating algorithm. KOFFSET Type: Numeral. Range: ?63 to 63. Unit: dB. Default: 0. Command: RLNRC. Comments: Signal strength offset when evaluating K-cells.
RADIO NETWORK PARAMETERS & CELL DESIGN DATA FOR ERICSSON’S GSM SYSTEM 90/1553-HSC 103 12 Uen Rev B 2001-02-01 59(163)

An offset value is a certain amount of dB by which the path loss or the signal strength can be adjusted in order to push the cell border towards or away from the serving BTS. As the BSC does not accept negative parameters each offset parameter is implemented as two different parameters. For instance, in the case of KOFFSET, the BSC parameters are called KOFFSETP (zero or positive value) and KOFFSETN (negative value). The same goes for LOFFSET and TROFFSET.

Note: KOFFSET is only valid for the Ericsson1 locating algorithm. LOFFSET Type: Numeral. Range: ?63 to 63. Unit: dB. Default: 0. Command: RLNRC. Comments: Path loss offset when evaluating L-cells. Note: LOFFSET is only valid for the Ericsson1 locating algorithm. TROFFSET Type: Numeral. Range: ?63 to 63. Unit: dB. Default: 0. Command: RLNRC. Comments: Signal strength offset for a K- and L-cell border segment. Note: TROFFSET is only valid for the Ericsson1 locating algorithm. Parameters for the Ericsson3 locating algorithm HIHYST Type: Numeral. Range: 0 to 63. Unit: dB.
RADIO NETWORK PARAMETERS & CELL DESIGN DATA FOR ERICSSON’S GSM SYSTEM 60(163) 90/1553-HSC 103 12 Uen Rev B 2001-02-01

Default: 5. Command: RLNRC. Comments: Signal strength hysteresis when evaluating high signal strength cells. Note: HIHYST is only valid for the Ericsson3 locating algorithm. LOHYST Type: Numeral. Range: 0 to 63. Unit: dB. Default: 3. Command: RLNRC. Comments: Signal strength hysteresis when evaluating low signal strength cells. Note: LOHYST is only valid for the Ericsson3 locating algorithm. HYSTSEP Type: Numeral. Range: 0 to 150. Unit: dBm (negative). Default: 90. Command: RLNRC. Comments: Signal strength separator for high and low signal strength cells. HYSTSEP takes a positive value which represents the

corresponding negative value in calculations. Note: HYSTSEP is only valid for the Ericsson3 locating algorithm. OFFSET Type: Numeral. Range: ?63 to 63. Unit: dB. Default: 0 Command: RLNRC. Comments: Signal strength offset.
RADIO NETWORK PARAMETERS & CELL DESIGN DATA FOR ERICSSON’S GSM SYSTEM

The parameter is represented by OFFSETN, if the value is in the range (?63, -1) dB. Positive values, (0, 63) dB, is represented by OFFSETP. Note: OFFSET is only valid for the Ericsson3 locating algorithm.


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