OMO132050 BSC6900 GSM V9R11R12R13 Radio Channel Allocation Algorithm and Parameters ISSUE 1.01

7/27/2019 OMO132050 BSC6900 GSM V9R11R12R13 Radio Channel Allocation Algorithm and Parameters ISSUE 1.01

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GSM Radio Channel Allocation Algorithm and

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The Base Station Controller (BSC) needs to allocate a suitable channel in the followingsituations: a mobile station (MS) initiates a call (immediate assignment); an MS needs to

access a TCH for speech, after a channel for signaling is allocated (assignment); an MSneeds to be handed over to another channel (handover, including the intra-BSC handover,inter-BSC handover, and inter-RAT handover).

When the MS initiates a new call, an SDCCH or a TCH has to be allocated according to thecall establishment cause. In this case, the TCH is used to carry signaling.

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Channel assignment process starts when the radio resource (such as SDCCH and TCH) isrequired.

HW II channel assignment algorithm is based on optimum selection. The available channelwith highest overall priority will be assigned.

CKSN: Cipher Key Sequence Number

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Channel Assignment Processing is invoked for every signalling channel request as well asTCH set–up and all different incoming handovers.

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Channel Allocate Strategy

Meaning: Channel assignment priority of the cell

GUI Value Range: CAPABILITY(Capability preferred), QUALITY(Quality preferred),PSRELATIVELY(PS relatively preferred), PSABSOLUTELY(PS absolutely preferred)

Actual Value Range: CAPABILITY, QUALITY, PSRELATIVELY, PSABSOLUTELY

Unit: None

Default Value: CAPABILITY


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There are four types of channel assignment strategies, which are described as follows:

CHAP0: Capacity > quality > PS coordination > management

CHAP1: Quality > capacity > PS coordination > management

CHAP2: Capacity > PS coordination > quality > management

CHAP3: PS coordination > capacity > quality > management

"A>B" indicates that the weight of A is higher than that of B (this is, A ismore important than B). CHAP1 is selected for quality handover andreassignment, independent of the configuration. In other cases, thechannel assignment strategy is determined by the setting of Channel Allocate Strategy. Generally, CHAP0 is recommended. If the proportionof PS services is relatively high and the network quality is good, CHAP2 can

be selected.

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Channel Rate Priority

This defines the priority of the data rate of a channel based on the type of therequested channel and the state and type of the current channel.

If only the full rate TCH is requested or preferred, the priority for assigning a TCH isas follows: full rate TCH > half rate TCH whose two sub–timeslots are idle > halfrate TCH whose one sub–timeslot is idle.

If only the half rate TCH is requested or preferred, the priority for assigning a TCHis as follows: half rate TCH whose one sub–timeslot is idle > half rate TCH whosetwo sub–timeslots are idle > half rate TCH.

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HR Allocation Flag

Meaning: Whether to enable the BSC to assign half rate channels preferentially

when the Ater interface is congested

GUI Value Range: Close(Close), Open(Open)

Unit: None

Actual Value Range: Close, Open

MML Default Value: None

Recommended Value: Open

Parameter Relationship: If the resource usage on the Ater interface exceeds thevalue of AterCongstRatio and this parameter is set to Open, the BSCpreferentially selects TCHH when assigning traffic channels.


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TCHH Function Switch

Meaning: This parameter specifies whether to enable the Abis resource adjustment

TCHH function. It specifies whether the TCHH is preferentially allocated to the MSby the BSC when Abis resources are insufficient. If the Abis resource load is greaterthan Flex Abis Prior Choose Load Thred or Fix Abis Prior Choose Abis LoadThred when the parameter is set to "YES", the BSC preferentially allocates theTCHH to the MS.

Value Range: NO(NO), YES(YES) Recommended Value: NO

Fix Abis Prior Choose Load Thred

Meaning: This parameter specifies the static Abis resource load threshold. If thestatic Abis resource load is less than the static Abis resource load threshold, theTCHF is preferentially allocated. Otherwise, whether the TCHF or the TCHH shouldbe preferentially allocated is determined by the dynamic Abis resource load.

Value Range: 0~100 Unit: % Recommended Value: 80

Flex Abis Prior Choose Load Thred

Meaning: If the static Abis resource load is greater than the value of Fix Abis PriorChoose Load Thred and the dynamic Abis resource load is greater than the valueof this parameter, the half-rate channel is preferred. Otherwise, the full-ratechannel is preferred.



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TCH Traffic Busy Threshold

Meaning: If the current channel seizure ratio reaches or exceeds this value, the

half-rate TCH is assigned preferentially; otherwise, the full-rate TCH is assignedpreferentially.

Value Range: 0~100 Unit: % Default Value: 60

AMR TCH/H Prior Allowed

Meaning: Whether channels are assigned and TCHF-to-TCHH handover decisionsare made on the basis of the AMR TCH/H prior cell load threshold if AMR calls aredetected.

When this parameter is set to ON, the channel assignment algorithm usesthe AMR TCH/H prior cell load threshold to determine whether to assign

TCHHs to AMR calls, and Handover algorithm generation 1 uses the AMRTCH/H prior cell load threshold to determine whether to hand over AMRcalls occupying TCHFs to TCHHs;

When this parameter is set to OFF, the AMR TCH/H prior cell load thresholdis not used during channel assignment, and Handover algorithm generation1 determines whether to hand over AMR calls occupying TCHFs to TCHHswithout considering traffic in the corresponding cell.

Value Range: OFF(Off), ON(On) Recommended Value: ON

Impact on Network Performance: When this parameter is set to OFF, handoveralgorithm generation 1 does not consider traffic in the corresponding cell. This mayresult in a large number of TCHF-to-TCHH handover requests. In addition, speechquality will be affected if a large number of calls are carried on TCHHs.


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AMR TCH/H Prior Cell Load Threshold

Meaning: Load threshold for assigning half rate channels preferentially. If thecurrent TCH seizure ratio of the cell is greater than this threshold, AMR half ratechannels are assigned preferentially.

GUI Value Range: 0~99 Unit: %

Actual Value Range: 0~99


Recommended Value: 55

Impact on Network Performance: If this parameter is set to a greater value, cellcongestion may not be relieved. If this parameter is set to a smaller value, TCHFsmay be assigned unnecessarily, thus affecting the voice quality.


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Load of UL-OL Cells Rate Select Allowed

Meaning: Whether to enable the BSC to assign half or full rate channels to MSs

according to the channel seizure ratio in the overlaid and underlaid subcells

Value Range: NO(No), YES(Yes) Recommended Value: YES

Tch Traffic Busy Overlay Threshold

Meaning: The BSC assigns channels in the overlaid subcell to the MS in aconcentric cell. If the channel seizure ratio of overlaid subcell is greater than thevalue of this parameter, half-rate channels are assigned. Otherwise, full-ratechannels are assigned.

Channel seizure ratio = (Num. of busy TCHF + Num. of busy TCHH/2)/(Num. ofavailable TCHF + Num. of available TCHH /2) x 100%. This parameter is valid for

the concentric cell. When the Load of UL-OL Cells Rate Select Allowed is set toYes, the TCH Traffic Busy Threshold (%) is invalid for the concentric cell.


Tch Traffic Busy Underlay Threshold

Meaning: Threshold for determining that the underlaid subcell is busy. The BSCassigns channels in the underlaid subcell to the MS in a concentric cell. When Loadof UL-OL Cells Rate Select Allowed is set to YES, half-rate channels are assignedif the channel seizure ratio in the underlaid subcell exceeds the value of thisparameter, and full-rate channels are assigned if the channel seizure ratio in theunderlaid subcell does not exceed the value of this parameter.



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Channel Rate Assignment Priority

This defines the priority of dynamic channel adjustment based on whether a TRXsupports dynamic channel adjustment.

The channels provided by the TRXs that do not support channel conversion areassigned first while the TRXs that support channel conversion are reserved. Thiscan greatly improve the network capacity and quality.

In the example above TRX:2 and TRX:3 are flexibly convertible, so all the other TRXshould have higher priority.

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TCH Rate Adjust Allow

Meaning: Whether to allow the cell to dynamically change a channel from full rate

to half rate or from half rate to full rate. If this parameter is set to Yes, theconversion is allowed; if the parameter is set to No, the conversion is not allowedand the changed channel is restored to the previous rate mode. In addition, thisparameter helps to determine the channel assignment priority. The channels in aTRX that does not allow dynamic adjustment take priority.

GUI Value Range: NO(No), YES(Yes)

Unit: None

Actual Value Range: NO, YES

Recommended Value: NO


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This sub-priority totally has 8 bits. The possible bands are prioritized in the following order:

DCS1800 > PCS1900 > GSM480 > GSM450 > GSM850 > R–GSM > E–GSM > P–GSM

Additionally the corresponding bit will be set 0 only if the MS supports the respective bandcorresponding bit is 0 and BCCH frequency band of the current cell . Otherwise, it is 1.

Following this sequence the DCS1800 has the highest priority and the GSM900_P thelowest priority. This ensures that the more special bands are allocated to the MS’s capableof these and the more common frequency bands are reserved to the low-end MSs andthus the network capacity is maximized.

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According to GSM 05.05 (version 8.5.0)， Frequency bands and channel arrangement :

i) Standard or primary GSM 900 Band, P-GSM:

-for Standard GSM 900 band, the system is required to operate in thefollowing frequency band:

-890 MHz to 915 MHz: mobile transmit, base receive;

-935 MHz to 960 MHz: base transmit, mobile receive.

ii) Extended GSM 900 Band, E GSM (includes Standard GSM 900 band):

-for Extended GSM 900 band, the system is required to operate in thefollowing frequency band:

-880 MHz to 915 MHz: mobile transmit, base receive; -925 MHz to 960 MHz: base transmit, mobile receive.

iii) Railways GSM 900 Band, R GSM (includes Standard and Extended GSM 900Band);

-for Railways GSM 900 band, the system is required to operate in thefollowing frequency band:



iv) DCS 1800 Band: -for DCS 1800, the system is required to operate in the following band:



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v) PCS 1900 Band:

-for PCS 1900, the system is required to operate in the following band:


-1930 MHz to 1990 MHz base transmit, mobile receive.

NOTE 1:The term GSM 900 is used for any GSM system, which operates in any 900 MHzband.

NOTE 2:The BTS may cover a complete band, or the BTS capabilities may be restricted to asubset only, depending on the operator needs.

Operators may implement networks which operates on a combination of the frequencybands above to support multi band mobile terminals which are defined in GSM 02.06.

The carrier spacing is 200 kHz.

Frequencies are in MHz.

The carrier frequency is designated by the absolute radio frequency channel number

(ARFCN). If we call Fu(n) the frequency value of the carrier ARFCN n in the uplink band,and Fd(n) the corresponding frequency value in the downlink band, we have the tableabove.


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In dynamic PBT mode, the corresponding timeslots on the two TRXs of a double-transceiver unit are set to PBT, and other timeslots are set to non-PBT. After the timeslots

in PBT mode are released, they can be set to non-PBT. Dynamic PBT makes full use of idletimeslots and expands the coverage in the areas with weak signals. Based on actualnetwork conditions, adjustments can be made to achieve balance between capacity andcoverage.

The dynamic PBT algorithm applies to a concentric cell. A channel group can only beformed in the overlaid subcell of a concentric cell to convert coverage and capacitybetween overlaid and underlaid subcells.

The underlaid subcell is used to solve the coverage problem, but the capacity of theunderlaid subcell may be restricted. More TRXs can be configured in the overlaid subcell tobear heavy traffic, but the coverage of the overlaid subcell may be poor. Therefore, in aconcentric cell, the underlaid subcell is easily congested and the overlaid subcell is idle. The

transmit diversity or PBT can enhance the coverage at the cost of capacity. If the totaltraffic is not very high, the dynamic transmit diversity or dynamic PBT can be used in theoverlaid subcell to increase the coverage of the overlaid subcell, balance the load betweenthe overlaid and underlaid subcells, and improve the bearing capability of a concentric cell.With the algorithm, a channel group is dynamically formed, and if unneeded, the channelgroup can be immediately split into two independent channels. Therefore, the capacity ofthe cell does not decrease greatly.

Precautions of the application of dynamic PBT:

Only a double-transceiver unit supports dynamic transmit diversity or dynamic PBT.

If the type of the channel of TRX timeslots is SDCCH or PDCH, a channel group cannot be formed. Only TCHs can form a channel group.

The transmit diversity conflicts with such functions as baseband FH and antennahopping, so they cannot be activated simultaneously.

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Dynamic transmit diversity:

When a channel group is formed, one baseband is disabled and theother baseband is simultaneously connected to two RF channels. Aslight delay, however, exists between the baseband signals transmittedon two channels.

Dynamic PBT:

When a channel group is formed, one baseband is disabled and theother baseband is simultaneously connected to two RF channels. Thepower amplifiers of two RF channels are connected in series to form atwo-level power amplifier, and then the power amplifier is connectedto an antenna system.

Compared with an independent channel, a transmit-diversity channelgroup has an about 3 dB gain of downlink signal strength, and a PBT

channel group has an about 4.5 dB gain of downlink signal strength.

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Dynamic Transmission Div Supported

Meaning: Whether to enable the cell to support dynamic transmit diversity or

dynamic PBT

GUI Value Range: NOTSUPPORT(Not Support), DDIVERSITY(DDIVERSITY),DPBT(DPBT)

Unit: None

Actual Value Range: NOTSUPPORT, DDIVERSITY, DPBT

Recommended Value: NOTSUPPORT


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Send Mode

Meaning: RF send mode of the TRX.

The BTS3006C and BTS3002E do not support Wide Band Combining,Power Booster Technology, DPBT, or Transmitter Independent orCombining.

The DBS3900 GSM GRRU does not support Wide Band Combining,Transmitter Independent or Combining, Power Booster Technology, orDPBT.

The BTS3900 GSM and BTS3900A GSM do not support TransmitterIndependent or Wide Band Combining.

GUI Value Range: NOCOMB(No Combination), PBT(PBT), WBANDCOMB(WidebandCombination), DIVERSITY(Transmit Diversity), DDIVERSITY(Dynamic TransmitDiversity), DPBT(DPBT), DTIC(Transmit Independency or Combination), NONE(none)

Unit: None

Actual Value Range: NOCOMB, PBT, WBANDCOMB, DIVERSITY, DDIVERSITY,DPBT, DTIC, NONE


Recommended Value: if TRX of Board type is TRU, QTRU, MRRU, GRRU therecommended value is "NOCOMB". if TRX of Board type is BTS3900B, DRFU, DRRUthe recommended value is "DTIC".


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IUO cell TRX property

The criteria are the same for TCH and SDCCH. This sub–priority will be 1 just whenall of the following conditions are fulfilled; Otherwise, it is 0.

Current cell is a concentric cell.

The property of the current channel is different from the demanded propertywhich is described in required channel

Inter–BSC handover

In the case that the receive level, receive quality, and timing advance of a neighborcell are unavailable, parameters such as Underlaid Subcell Preferred or OverlaidSubcell Preferred are set. No strategy is involved in this case.

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Tight BCCH frequency reuse enables the BCCHs to use fewer frequencies, thus increasingthe number of frequencies at the service layer and expanding the system capacity.

When tight BCCH frequency reuse is configured and the tight BCCH algorithm is enabled,the tight BCCH priority is used.

The purpose of the algorithm is as follows: In the network with limited frequencyresources, the tight BCCH frequency reuse technology can decrease the number offrequencies used by the BCCHs and increase the number of frequencies at the FH layer toimprove the capacity of the system. When a tighter frequency reuse pattern is used, theinterference on the BCCH TRX is increased. In this case, the performance of TCHs on theBCCH TRX decreases. Therefore, to ensure the performance of the network, you can usethe tight BCCH frequency reuse algorithm to enable the TCHs on the BCCH TRX to coverthe center of the cell.

The implementation process of the tight BCCH frequency reuse algorithm is as follows: Acell is divided into two logical layers: TCH layer on the BCCH TRX and FH layer. The FHlayer serves and covers the whole network, including cell edges. The TCH layer, however,covers only the MSs near the BTS to guarantee call access and reduce interference near theBTS.

When the MS accesses a cell with tight BCCH enabled (including assignment, immediateassignment, and incoming cell handover), the TCH on the non-BCCH TRXs is preferentiallyassigned. The implementation method is as follows: The BTRX field in the priority of theTCH on the BCCH TRX is set to 1, and The BTRX field in the priority of the TCH on thenon-BCCH TRXs is set to 0. In this way, the priority value of the TCH on the non-BCCH

TRXs is smaller than that on the BCCH TRX (that is, the TCH on the non-BCCH TRXs ispreferentially assigned).

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History Record Priority

This is used to keep a record of good or bad channels. This defines the priority ofhistory seizure record based on the situations in which a channel was occupied.

The channel allocation algorithm can memorize the history record, which involvesthe successful channel occupation, failed channel occupation, and call drops inchannel occupation. The algorithm also distinguishes whether the failed channeloccupation or call drops in channel occupation are concerned with radio channels.Such history records provide reliable basis for the current channel assignment.

After the adjustment period a fixed amount is subtracted to avoid that even a badchannel is stuck in not being allocated.

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Active Ch Interf. Meas. Allowed

Range: Yes, No

Default: Yes Description: Indicates whether the interference of the active channel is measured.

If the setting is "No", the system does not judge whether the active channel isinterfered, nor sending interference indication message. Otherwise, judgment willbe made.

Interf. of UL/DL Level thrsh.

Range:0~63,(–110dBm~–47dBm)grade

Default:31

Description: Threshold of uplink strength interference. If the uplink strength of achannel is greater than this threshold and the uplink signal quality is worse than orequal to the “Interf. of UL Qual. Thrsh.”, then uplink interference exists.

Interf. of UL/DL Qual. Thrsh. Range:0~70, (RQ0~RQ7)

Default:40

Description: Threshold of uplink quality interference. See the description of “Interf.of UL level Thrsh “.

Filter length for TCH Level

Range:1~32

Default:6

Description: Used to filter the receiving signal strength of speech/data channel.

Filter length for TCH Qual

Range:1~32

Default:6 Description: Used to filter the receiving signal quality of speech/data channel.

Filter length for SDCCH Level and Filter length for SDCCH Qual

The same as previous parameter

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This defines the priority of interference based on the interference measurement.

The interference on the channels affects voice quality and some key traffic measurement

counters, such as call completion rate, call drop rate, and successful handover rate. Thus,the channel interference must be taken into account in the channel allocation. Theinterference that can be measured consists of the uplink interference of the idle channeland the uplink/downlink interference of the occupied channel.

The channels with less interference should be assigned first except in the following cases:

For the high–end calls or subscribers, the MSC should prevent the channels whoseinterference exceeds a predefined interference threshold from being assigned.

To improve the call completion rate and voice quality, the calls with better receive levelshould be assigned with relatively high–interference channels and those with worsereceive level should be assigned with relatively low–interference channels, taken intoaccount the maximum transmit power of the MS and the path loss in a certain callenvironment

Interf. Priority Allowed

Range: Yes, No

Default: Yes

Description: Indicates whether the interference record priority is allowed.

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Interf. Priority Allowed

Range: Yes, No

Default: Yes

Description: Indicates whether the interference record priority is allowed.

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Flex Abis Mode

Meaning: Service timeslot assignment mode for the BTS. If this parameter is set to

FIX_16K_ABIS, the BSC assigns a fixed Abis transmission timeslot to a TCH. If thisparameter is set to FLEX_ABIS, the BSC assigns an Abis transmission timeslotdynamically to a TCH (except the static PDCH) to increase the resource utilization.If this parameter is set to SEMI_ABIS, the BTS to which a TCH belongs assigns afixed Abis transmission timeslot to the TCH while the upper-level BTS set toFLEX_ABIS assigns an Abis transmission timeslot dynamically to the TCH. This modeapplies where old and new BTSs are cascaded. HDLC and IP BTS is not support thisparameter.

1. If the Flex Abis function is enabled on the BTS, and if the extensioncabinet group is directly connected to the BSC, the Abis timeslots allocatedto the extension cabinet group are displayed as TCH, indicating fixed

timeslots. If the extension cabinet group needs to process data services,and if the high-rate coding schemes (CS3 and CS4; MCS3 to MCS9) arerequired, idle timeslots need to be configured.

2. If the Flex Abis function is enabled on the BTS, and if the channel type ischanged to static PDCH, the type of corresponding Abis timeslots isautomatically changed to TCH, indicating fixed timeslots.

3. In the case of cascaded BTSs, if an upper-level BTS is in Flex Abis mode,and if a lower-level BTS is in SemiSolid mode, the type of the timeslotsallocated to the lower BTS is displayed as TCH, indicating fixed timeslots,but the timeslot type that the upper-level BTS reports to the BSC isdisplayed as Flex.If the lower-level BTS needs to process data services, andif the high-rate coding schemes (CS3 and CS4; MCS3 to MCS9) arerequired, idle timeslots need to be configured.

Value Range: FIX_16K_ABIS(Fix Abis), FLEX_ABIS(Flex Abis), SEMI_ABIS(SemisolidAbis)

Recommended Value: FIX_16K_ABIS


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Speech Version

Meaning: Speech version supported by a cell

Value Range: FULL_RATE_VER1(Full-rate VER 1), FULL_RATE_VER2(Full-rate VER 2),FULL_RATE_VER3(Full-rate VER 3), HALF_RATE_VER1(Half-rate VER 1),HALF_RATE_VER2(Half-rate VER 2), HALF_RATE_VER3(Half-rate VER 3),FULL_RATE_VER5(Full-rate VER 5)

Unit: None

Recommended Value: FULL_RATE_VER1-1&FULL_RATE_VER2-1&FULL_RATE_VER3-0&HALF_RATE_VER1-1&HALF_RATE_VER2-0&HALF_RATE_VER3-0&FULL_RATE_VER5-0


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Frequency Reuse Mode

Meaning: Frequency multiplexing mode in the TRX. To enable a loose frequency

multiplexing mode such as 4x3 multiplexing, set this parameter to LOOSE. Toenable a tight frequency multiplexing mode such as 1x3 or 1x1, set this parameterto TIGHT.

GUI Value Range: LOOSE(Loose), TIGHT(Tight)

Unit: None

Actual Value Range: LOOSE, TIGHT

Recommended Value: LOOSE

Impact on Network Performance: The setting of this parameter must be consistentwith the actual frequency reuse pattern of the TRX. Otherwise, the speech quality

will be bad.


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In the reassignment procedure, if the newly assigned TRX differs from the original TRX, achannel provided by the current TRX should be assigned first. Thus if the original TRX was

on a bad frequency (non hopping) or otherwise faulty, the different TRX may be successful.

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Shortest PDCH Distance Priority

In a network where both CS services and PS services are provided, some channelsneed to be reserved for the PS services as the PS services have high requirementsfor continuities. In addition, the channel that is the farthest from the PDCH timeslotis preferentially assigned to the CS service.

PDCH Quantity Priority

In a network where both CS services and PS services are provided, some channelsneed to be reserved for the PS services as the PS services have high requirementsfor continuity. In addition, the channel on the TRX with less PDCHs should bepreferentially assigned to the CS services.

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Timeslot Priority

Meaning: Assignment priority level of the channel. If this parameter is less, the

assignment priority level of the channel is higher.

GUI Value Range: 0~7

Unit: None

Actual Value Range: 0~7


Recommended Value: 0


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Priority of Shut Down TRX

Meaning: Priority level at which the BSC shuts down the power amplifier of the

TRX when the intelligent shutdown function is enabled. If this parameter is setsmaller, the priority level is higher, the power amplifier of the TRX is shut downlater.

GUI Value Range: L0(Level0), L1(Level1), L2(Level2), L3(Level3), L4(Level4),L5(Level5), L6(Level6), L7(Level7)

Unit: None

Actual Value Range: L0, L1, L2, L3, L4, L5, L6, L7


Recommended Value: L0

Parameter Relationship: This parameter is valid only whenBSCDynSwitchTrxPAAllow in SET BSCDSTPA,DYNOpenTrxPower in SETGCELLBASICPARA and CPS are set to YES.


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http://localhost:7890/pages/31185308/Draft%20A/31185308/Draft%20A/resources/mbsc/m-mml/set-bscdstpa.html

http://localhost:7890/pages/31185308/Draft%20A/31185308/Draft%20A/resources/mbsc/m-mml/set-gcellbasicpara.html




http://localhost:7890/pages/31185308/Draft%20A/31185308/Draft%20A/resources/mbsc/m-mml/set-bscdstpa.html



Allocation TRX Priority Allowed

Meaning: This parameter specifies whether the TRX priority is considered during

channel assignment. When the parameter is set to YES, the smaller the parameterTRX Priority in the command SET GTRXDEV is, the higher priority the TRX is.Under other conditions, channels are preferentially allocated from high-priorityTRXs.


Unit: None



Recommended Value: YES

TRX Priority Meaning: This parameter specifies the TRX priority in channel assignment. The

smaller this parameter is, the higher the TRX priority is. For two TRXs with otherconditions identical, channels on the TRX with higher priority are preferentiallyassigned.

GUI Value Range: L0(Level0), L1(Level1), L2(Level2), L3(Level3), L4(Level4),L5(Level5), L6(Level6), L7(Level7)

Unit: None

Actual Value Range: L0, L1, L2, L3, L4, L5, L6, L7

MML Default Value: None Recommended Value: L0

Parameter Relationship: This parameter is valid only when TRXPRIALLOW is set toYES.


Parameters


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http://localhost:7890/pages/31185308/Draft%20A/31185308/Draft%20A/resources/mbsc/m-mml/set-gtrxdev.html



The Intelligent Combiner Bypass(ICB) Principle

ICB is applicable to the dual-transceiver unit. ICB is aimed at decreasing the BTSpower consumption when the traffic load is light. In ICB, the carrier of channel B isshut down in idle hours and the carrier of channel A is configured to work in PBTmode. In addition, the voltage of both channels is decreased to reduce the powerconsumption. You can enable the TRX to work in ICB mode through configuration.

Prerequisite

The cell attribute parameter Allow Dynamic Voltage Adjustment is set to Yes.

Power Level of the BCCH TRX is set to 0 or 1.

The non-BCCH TRX is not configured with PDCHs.

The baseband FH and antenna hopping are not configured.

Enter “CellSoft Parameters table”, set ICB Allowed to Yes

Context

When the TRX other than the BCCH TRX is idle, the dual-transceiver unit thathouses the BCCH TRX starts working in ICB mode and the capacity of the dual-transceiver unit decreases to one TRX. If the minimum working voltage is appliedto the TRX, the output power of the single power amplifier of the TRX is decreasedto 15 W or 10 W. After the power booster technology (PBT) is enabled on a TRX,the cabinet-top power of the TRX is the same as the cabinet-top power providedwhen the single power amplifier transmits at 60 W or 40 W.

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The intelligent power consumption featrure enables the selection of TRX with the maxpower first, because unused TRX could shut down their amplifiers while not busy. This way

the TRX:0 always has highest priority because it transmits with a fixed power continuouslyanyway.

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Parameters



Power Priority Allowed

Meaning: When this parameter is set to YES, The BSC preferentially uses the TRX

with good power-saving performance according to the TRX power priorityreported by the BTS. Smaller priority value indicates better power saving quality. Ifthe priority is of a great value, the BTS closes TRXs late.


Unit: None



Recommended Value: YES


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ICB Allowed

Meaning: This parameter is used to enable the Intelligent Combiner Bypass (ICB)

function on the BCCH TRX of a cell.

This parameter specifies whether to allow the cell to enable the ICB function.When this parameter is set to YES, the TCHs on the non-BCCH TRX arepreferentially assigned. In this way, the largest possible number of idle TCHs isreserved on the BCCH TRX, and thus the BCCH TRX enters the ICB mode.

GUI Value Range: NO(NO), YES(YES), NULL(NULL)

Unit: None

Actual Value Range: NO, YES, NULL


Recommended Value: NO


Parameters


P-64




Parameters


P-65




Parameters


P-66



P-67GSM Radio Channel Allocation Algorithm and

Parameters

OMO132050 BSC6900 GSM V9R11R12R13 Radio Channel Allocation Algorithm and Parameters ISSUE 1.01

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